As filed with the Securities and Exchange Commission on August 12, 2005.

                                                     Registration No. 333-_____
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                          ABRAXAS PETROLEUM CORPORATION

             (Exact name of registrant as specified in its charter)

                   Nevada                       74-2584033

        (State or other jurisdiction of        (I.R.S. Employer
        incorporation or organization)      Identification Number)

                                                Robert L. G. Watson
      500 North Loop 1604 East              500 North Loop 1604 East
             Suite 100                              Suite 100
       San Antonio, Texas 7823               San Antonio, Texas 78232
           (210) 490-4788                         (210) 490-4788

  (Address, including zip code, and          (Address,including zip code, and   
  telephone number, including                telephone number,including area 
  area code,of registrant's                  code, of agent for service)
  principal executive offices)                      

                                   Copies to:

                         Cox Smith Matthews Incorporated
                         112 E. Pecan Street, Suite 1800
                            San Antonio, Texas 78205
                                 (210) 554-5500
                           Attention: Steven R. Jacobs
                                                   Jeffrey C. Gifford


     Approximate date of commencement of proposed sale to the public:  From time
     to time after this Registration Statement becomes effective.

                            ------------------------

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box: [ ]

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box: [X]

     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering: [ ]


     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering: [ ] ----------

     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box: [ ]


                            ------------------------



                         CALCULATION OF REGISTRATION FEE

     Title of each class of          Amount to be          Proposed maximum         Proposed maximum aggregate        Amount of
  securities to be registered         registered        offering price per unit           offering price          registration fee
---------------------------------   ----------------   --------------------------   ----------------------------  ------------------
                                                                                                                
Abraxas common stock, par value
$.01 per share                         5,096,479               $4.57 (1)                $23,290,909.03 (1)            $2,741.34


(1) Estimated  solely for the purpose of  determining  the  registration  fee in
accordance  with Rule 457(c) under the  Securities Act based upon the average of
the high and low prices of Abraxas'  Common  Stock as  reported on The  American
Stock Exchange on August 10, 2005.

THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT  SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION  STATEMENT
SHALL  THEREAFTER  BECOME  EFFECTIVE  IN  ACCORDANCE  WITH  SECTION  8(a) OF THE
SECURITIES  ACT OF  1933 OR  UNTIL  THIS  REGISTRATION  STATEMENT  SHALL  BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.






THE  INFORMATION  IN  THIS  PROSPECTUS  IS NOT  COMPLETE  AND MAY  CHANGE.  THIS
PROSPECTUS  IS  INCLUDED  IN A  REGISTRATION  STATEMENT  THAT WE FILED  WITH THE
SECURITIES AND EXCHANGE  COMMISSION.  THE SELLING STOCKHOLDERS CANNOT SELL THESE
SECURITIES UNTIL THAT REGISTRATION STATEMENT BECOMES EFFECTIVE.  THIS PROSPECTUS
IS NOT AN OFFER TO SELL THESE  SECURITIES  AND IS NOT SOLICITING AN OFFER TO BUY
THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

                   SUBJECT TO COMPLETION DATED AUGUST 12, 2005

                          ABRAXAS PETROLEUM CORPORATION

                                5,096,479 Shares
                                 of Common Stock

     This prospectus relates to the offer and sale from time to time of up to an
aggregate  of 5,096,479  shares of our common stock by the selling  stockholders
named in this prospectus. The selling stockholders may sell none, some or all of
the shares offered by this prospectus. We cannot predict when or in what amounts
a selling stockholder may sell any of the shares offered by this prospectus.  We
will not receive any proceeds from any such sale by any selling stockholder.

Investing  in our  common  stock  involves  risks.  Please  carefully  read  the
information under the headings "Forward-Looking Statements" on page ii and "Risk
Factors"  beginning on page 3 of this prospectus before you invest in our common
stock.

     Our common  stock trades on The American  Stock  Exchange  under the symbol
"ABP." On August 10, 2005, the closing price of our common stock on The American
Stock Exchange was $4.52.

NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS  IS TRUTHFUL OR  COMPLETE.  ANY  REPRESENTATION  TO THE CONTRARY IS A
CRIMINAL OFFENSE.



                                -----------------

                     This Prospectus is dated ________, 2005






You should rely only on the  information  contained or incorporated by reference
in this prospectus.  We have not authorized anyone to provide you with different
information.  You should  not  assume  that the  information  contained  in this
prospectus  is  accurate as of any date other than the date on the front of this
prospectus.
                                                                    
                                TABLE OF CONTENTS


FORWARD-LOOKING INFORMATION..................................................ii

SUMMARY.......................................................................1

RISK FACTORS..................................................................3

USE OF PROCEEDS..............................................................11

DESCRIPTION OF CAPITAL STOCK.................................................11

SELLING STOCKHOLDERS.........................................................15

PLAN OF DISTRIBUTION.........................................................16

LEGAL MATTERS................................................................17

EXPERTS......................................................................17

WHERE YOU CAN FIND MORE INFORMATION..........................................17

INCORPORATION BY REFERENCE...................................................18

GLOSSARY OF TERMS............................................................18



                              ABOUT THIS PROSPECTUS

     This prospectus is part of a registration  statement that we filed with the
Securities and Exchange Commission  utilizing a "shelf"  registration process or
continuous offering process.  Under this shelf registration process, the selling
stockholders  may,  from time to time,  sell the  securities  described  in this
prospectus in one or more offerings. This prospectus provides you with a general
description of the securities which may be offered by the selling  stockholders.
Each time a selling  stockholder  sells securities,  the selling  stockholder is
required to provide you with this prospectus and, in certain cases, a prospectus
supplement containing specific information about the selling stockholder and the
terms of the securities  being offered.  That prospectus  supplement may include
additional  risk factors or other  special  considerations  applicable  to those
securities.   Any  prospectus   supplement  may  also  add,  update,  or  change
information  in this  prospectus.  If there  is any  inconsistency  between  the
information in this prospectus and any prospectus supplement, you should rely on
the  information  in that  prospectus  supplement.  You  should  read  both this
prospectus and any prospectus  supplement  together with additional  information
described under "Where You Can Find More Information."

                                       i



                           FORWARD-LOOKING INFORMATION

     We make  forward-looking  statements  throughout  this  prospectus  and the
documents included or incorporated by reference in this prospectus. Whenever you
read a statement  that is not simply a  statement  of  historical  fact (such as
statements  including words like "believe,"  "expect,"  "anticipate,"  "intend,"
"plan," "seek," "estimate," "could," "potentially" or similar expressions),  you
must  remember  that  these  are  forward-looking   statements,   and  that  our
expectations may not be correct, even though we believe they are reasonable. The
forward-looking  information  contained in this  prospectus  or in the documents
included or incorporated by reference in this prospectus is generally located in
the material set forth under the headings "Summary," "Risk Factors," "Business,"
and "Management's  Discussion and Analysis of Financial Condition and Results of
Operations" but may be found in other locations as well.  These  forward-looking
statements  generally  relate to our plans and objectives for future  operations
and are based upon our  management's  reasonable  estimates of future results or
trends.  The factors that may affect our  expectations  regarding our operations
include, among others, the following:

     o   our high debt level;

     o   our success in development, exploitation and exploration activities;

     o   our ability to make planned capital expenditures;

     o   declines in our production of natural gas and crude oil;

     o   prices for natural gas and crude oil;

     o   our ability to raise equity capital or incur additional indebtedness;

     o   political  and  economic   conditions   in  oil  producing   countries,
         especially those in the Middle East;

     o   price and availability of alternative fuels;

     o   our restrictive debt covenants;

     o   our acquisition and divestiture activities;

     o   results of our hedging activities; and

     o   other factors discussed  elsewhere in this offering  memorandum and the
         documents incorporated by reference in this offering memorandum.


                                       ii



20


                                     SUMMARY

     This summary highlights selected information from this prospectus, but does
not  contain all  information  that may be  important  to you.  This  prospectus
includes  specific  terms of this offering,  information  about our business and
financial  data. To understand  all of the terms of this offering and for a more
complete  understanding  of our business,  you should carefully read this entire
prospectus,  particularly the section entitled "Risk Factors", our annual report
on Form 10-K for the year ended  December 31, 2004 and our quarterly  reports on
Form 10-Q for the  quarters  ended March 31, 2005 and June 30,  2005,  which are
incorporated by reference  herein.  When we use the terms "Abraxas," "we," "us,"
"our," or the  "Company,"  we are  referring to Abraxas  Petroleum  Corporation,
together  with its  consolidated  subsidiaries,  unless  the  context  otherwise
requires. We have provided definitions for some of the natural gas and crude oil
industry  terms used in this  prospectus  in the section  entitled  "Glossary of
Terms."

Our Business

     Abraxas  Petroleum  Corporation  is an independent  energy company  engaged
primarily  in the  acquisition,  development,  exploitation  and  production  of
natural gas and crude oil.  Our  principal  means of growth has been through the
acquisition and subsequent development and exploitation of producing properties.
As a result of our historical acquisition activities,  we believe that we have a
substantial  inventory of low risk  exploitation and development  opportunities,
the successful  completion of which is critical to the maintenance and growth of
our current production levels.

     Our core areas of  operation  are in south and west Texas and east  central
Wyoming.  Our  current  producing  properties  are  typically  characterized  by
long-lived reserves,  established production profiles and an emphasis on natural
gas. At December 31, 2004, we owned  interests in 93,341 gross acres (81,748 net
acres)  applicable  to  our  continuing  operations,   and  operated  properties
accounting for approximately  95% of our PV-10. At December 31, 2004,  estimated
total proved  reserves were 93.7 Bcfe with an aggregate PV-10 of $149.0 million.
During the first six months of 2005, we  participated in the drilling of 7 gross
(7 net) wells with 6 gross (6 net) being  successful  and invested $17.3 million
in capital spending on these activities.

     We believe that our high  quality  asset base,  high degree of  operational
control and large inventory of drilling  projects position us for future growth.
Our  properties  are  concentrated  in  locations  that  facilitate  substantial
economies of scale in drilling and production operations and efficient reservoir
management  practices.  In  addition,  at December  31,  2004,  we had 47 proved
undeveloped  locations and have  identified  over 100 drilling and  recompletion
opportunities on our existing U.S. acreage, the successful  development of which
we  believe  could  significantly  increase  our  daily  production  and  proved
reserves.





                                       1


The Offering

     On July 20, 2005, we issued 4,000,000 shares of our common stock to certain
accredited  investors  pursuant to a private  placement.  In connection with the
private  placement,  we  agreed to  prepare  and file  with the  Securities  and
Exchange Commission,  no later than August 31, 2005, a registration statement to
enable the  resale of the  common  stock by the  selling  stockholders  or their
transferees.  We also agreed to use our commercially reasonable efforts to cause
such registration  statement to become effective as soon as practicable (subject
to certain conditions) and to remain continuously  effective for a period ending
on the date that is the earlier of (i) the date on which the selling stockholder
may sell all of the shares of common  stock  purchased  pursuant  to the private
placement and then held by such selling  stockholder  without  restriction under
Rule 144(k),  or (ii) such time as all of such shares of common stock  purchased
by such selling stockholder  pursuant to the private placement have been sold or
otherwise transferred pursuant to a registration statement or otherwise.

     In connection  with a refinancing of our  indebtedness  in October 2004, we
issued  warrants  to purchase  up to a total of  1,100,000  shares of our common
stock at a purchase  price of $0.01 per share to Guggenheim  Corporate  Funding,
LLC (1,000,000 shares) and Durham Capital Corporation  (100,000 shares).  Durham
exercised  its warrant in November  2004.  Guggenheim  exercised  its warrant in
March 2005 by  instructing  us to issue 996,479 shares and withhold 3,521 shares
of stock as consideration  for the shares to be issued pursuant to the exercise.
Guggenheim and Durham each have certain piggy-back  registration rights and have
required us to include their shares in the registration  statement of which this
prospectus is a part.

     As a result of the exercise of the Durham and  Guggenheim  warrants and our
obligations  in  connection  with  the  private  placement,   we  have  filed  a
registration  statement, of which this prospectus is a part, for the resale of a
total of  5,096,479  shares of our common  stock,  consisting  of the  1,096,479
shares of our common stock  issued to  Guggenheim  and Durham and the  4,000,000
shares of our common stock issued in the July 20, 2005 private placement.

Corporate Information

     Abraxas was originally incorporated in Texas in 1977 and re-incorporated in
Nevada in 1990 when it became a public  company.  Our common  stock is listed on
The American Stock  Exchange  under the symbol "ABP." Our principal  offices are
located at 500 North Loop 1604 East,  Suite 100, San Antonio,  Texas 78232,  and
our   telephone   number   is  (210)   490-4788.   Our   internet   address   is
www.abraxaspetroleum.com.


                                       2



                                  RISK FACTORS

Risks Related to Our Business

     We have a highly leveraged  capital  structure,  which limits our operating
and financial flexibility.

     We have a highly  leveraged  capital  structure.  At August 8, 2005, we had
total  indebtedness,  including our floating rate senior secured notes due 2009,
or notes,  which we issued in connection with our October 2004  refinancing,  of
approximately $128 million,  all of which is secured  indebtedness.  We also had
availability of $11.7 million under our revolving credit facility.

     Our highly leveraged  capital structure will have several important effects
on our future operations, including:

     o   a substantial  amount of our cash flow from operations will be required
         to service  our  indebtedness,  which will  reduce the funds that would
         otherwise  be  available  for  operations,   capital  expenditures  and
         expansion opportunities, including developing our properties;

     o   the covenants  contained in our revolving credit facility require us to
         meet   certain   financial   tests  and  comply  with   certain   other
         restrictions,  including  limitations  on capital  expenditures.  These
         restrictions, together with those in the indenture governing the notes,
         may limit our ability to undertake  certain  activities  and respond to
         changes in our business and our industry;

     o   our debt  level may impair our  ability to obtain  additional  capital,
         through  equity  offerings  or debt  financings,  for working  capital,
         capital expenditures, or refinancing of indebtedness;

     o   our debt level  makes us more  vulnerable  to  economic  downturns  and
         adverse  developments in our industry  (especially  declines in natural
         gas and crude oil prices) and the economy in general; and

     o   the notes and our  revolving  credit  facility  are subject to variable
         interest rates which makes us vulnerable to interest rate increases.

     We may not be able to fund the substantial  capital  expenditures that will
be required for us to increase our reserves and our production.

     We are required to make  substantial  capital  expenditures  to develop our
existing reserves and to discover new reserves.  Historically,  we have financed
our capital  expenditures  primarily with cash flow from operations,  borrowings
under  credit  facilities  and sales of producing  properties,  and we expect to
continue to do so in the future; however, we cannot assure you that we will have
sufficient capital resources in the future to finance our capital expenditures.

     Volatility in natural gas and crude oil prices,  the timing of our drilling
program and our  drilling  results  will  affect our cash flow from  operations.
Lower prices and/or lower production will also decrease  revenues and cash flow,
thus  reducing the amount of financial  resources  available to meet our capital
requirements,  including  reducing  the amount  available to pursue our drilling
opportunities. If our cash flow from operations does not increase as a result of
our planned  capital  expenditures,  a greater  percentage of our cash flow from
operations   will  be  required  for  debt  service  and  our  planned   capital
expenditures would, by necessity, be decreased.

     The borrowing base under our revolving  credit  facility will be determined
from time to time by our lenders,  consistent with their  customary  natural gas
and crude oil lending practices.  Reductions in estimates of our natural gas and
crude oil  reserves  could result in a reduction in our  borrowing  base,  which


                                       3


would reduce the amount of financial  resources  available  under our  revolving
credit facility to meet our capital requirements.  Such a reduction could be the
result  of  lower  commodity  prices  or  production,   inability  to  drill  or
unfavorable  drilling  results,  changes  in natural  gas and crude oil  reserve
engineering,  the lenders'  inability to agree to an adequate  borrowing base or
adverse changes in the lenders' practices regarding estimation of reserves.

     If cash flow from operations or our borrowing base decrease for any reason,
our  ability to  undertake  exploitation  and  development  activities  could be
adversely  affected.  As a result,  our  ability  to replace  production  may be
limited. In addition,  if the borrowing base under our revolving credit facility
is reduced,  we would be required to reduce our  borrowings  under our revolving
credit  facility so that such  borrowings do not exceed the borrowing base. This
could further  reduce the cash  available to us for capital  spending and, if we
did not have sufficient capital to reduce our borrowing level, could cause us to
default under our revolving credit facility and the notes.

     We have sold producing  properties to provide us with liquidity and capital
resources in the past and may do so in the future. After any such sale, we would
expect to utilize  the  proceeds  to drill new wells.  If we cannot  replace the
production lost from  properties  sold with production from new properties,  our
cash flow from operations  will likely  decrease which, in turn,  would decrease
the amount of cash available for debt service and additional capital spending.

     We may be unable to acquire or develop additional  reserves,  in which case
our results of operations and financial condition would be adversely affected.

     Our future natural gas and crude oil production, and therefore our success,
is highly  dependent  upon our ability to find,  acquire and develop  additional
reserves that are profitable to produce. The rate of production from our natural
gas and crude  oil  properties  and our  proved  reserves  will  decline  as our
reserves are produced unless we acquire additional  properties containing proved
reserves, conduct successful development and exploitation activities or, through
engineering studies, identify additional behind-pipe zones or secondary recovery
reserves.   We  cannot  assure  you  that  our  exploration,   exploitation  and
development activities will result in increases in our proved reserves. While we
have had some  success in pursuing  these  activities,  we have not been able to
fully  replace the  production  volumes  lost from  natural  field  declines and
property  sales.  As our  proved  reserves,  and  consequently  our  production,
decline, our cash flow from operations and the amount that we are able to borrow
under  our  revolving   credit   facility   will  also  decline.   In  addition,
approximately  49% of our total  estimated  proved reserves at December 31, 2004
were undeveloped.  By their nature,  estimates of undeveloped  reserves are less
certain. Recovery of such reserves will require significant capital expenditures
and successful drilling operations.

     Prior to our January 2003 financial restructuring,  we implemented a number
of measures to conserve our cash resources,  including  postponement of drilling
projects.  While these measures helped  conserve our cash  resources,  they also
limited our ability to  replenish  our  depleting  reserves.  We also  postponed
drilling  projects as a result of the capital spending  limitations that existed
in our 11 1/2% secured notes due 2007, which were redeemed in October 2004. As a
result, our current producing  properties have continued to deplete, and we have
not been able to drill new wells at a rate  that we would  have  desired  in the
absence of these  limitations.  The terms of our revolving credit facility place
limits on our capital  expenditures,  which could limit our ability to replenish
our reserves and increase production.

     We may not find  any  commercially  productive  natural  gas or  crude  oil
reservoirs.

     We cannot assure you that the new wells we drill will be productive or that
we will  recover  all or any  portion of our capital  investment.  Drilling  for
natural  gas and crude  oil may be  unprofitable.  Dry holes and wells  that are
productive but do not produce sufficient net revenues after drilling,  operating
and other costs are unprofitable.  The inherent risk of not finding commercially
productive  reservoirs  will be  compounded  by the fact  that 49% of our  total
estimated  proved  reserves at  December  31,  2004 were  undeveloped.  By their
nature,  estimates of  undeveloped  reserves are less certain.  Recovery of such
reserves will require significant  capital  expenditures and successful drilling
operations.  In addition,  our  properties  may be  susceptible to drainage from


                                       4


production by other operations on adjacent properties.  If the volume of natural
gas and crude oil we  produce  decreases,  our cash  flow from  operations  will
decrease.

     Restrictive  debt  covenants  could  limit our  growth  and our  ability to
finance our operations,  fund our capital needs,  respond to changing conditions
and engage in other business activities that may be in our best interests.

     Our revolving credit facility and the indenture governing the notes contain
a number of significant  covenants that,  among other things,  limit our ability
to: o incur or guarantee  additional  indebtedness  and issue  certain  types of
preferred stock or redeemable stock;

     o   transfer or sell assets;

     o   create liens on assets;

     o   pay  dividends  or make other  distributions  on capital  stock or make
         other  restricted  payments,   including  repurchasing,   redeeming  or
         retiring   capital  stock  or  subordinated   debt  or  making  certain
         investments or acquisitions;

     o   engage in transactions with affiliates;

     o   guarantee other indebtedness;

     o   make any change in the principal nature of our business;

     o   prepay,  redeem,  purchase  or  otherwise  acquire  any  of  our or our
         restricted subsidiaries' indebtedness;

     o   permit a change of control;

     o   directly or indirectly make or acquire any investment;

     o   cause a restricted subsidiary to issue or sell our capital stock; and

     o   consolidate,  merge  or  transfer  all  or  substantially  all  of  the
         consolidated assets of Abraxas and our restricted subsidiaries.

     In  addition,  our  revolving  credit  facility  requires  us  to  maintain
compliance  with  specified  financial  ratios  and  satisfy  certain  financial
condition tests. Our ability to comply with these ratios and financial condition
tests may be affected by events  beyond our  control,  and we cannot  assure you
that we will meet these ratios and financial  condition  tests.  These financial
ratio  restrictions  and  financial  condition  tests could limit our ability to
obtain future financings,  make needed capital expenditures,  withstand a future
downturn  in our  business  or the  economy  in  general  or  otherwise  conduct
necessary or desirable corporate activities.

     A breach of any of these  covenants  or our  inability  to comply  with the
required financial ratios or financial condition tests could result in a default
under our revolving  credit  facility and the notes. A default,  if not cured or
waived, could result in all of our indebtedness,  including the notes,  becoming
immediately due and payable. If that should occur, we may not be able to pay all
such debt or to borrow  sufficient  funds to refinance it. Even if new financing
were then available, it may not be on terms that are acceptable to us.

     The marketability of our production  depends largely upon the availability,
proximity  and  capacity  of  natural  gas  gathering  systems,   pipelines  and
processing facilities.

     The  marketability  of our production  depends in part upon  processing and
transportation  facilities.  Transportation  space on such gathering systems and
pipelines is  occasionally  limited and at times  unavailable  due to repairs or
improvements  being made to such  facilities or due to such space being utilized
by other  companies  with  priority  transportation  agreements.  Our  access to
transportation options can also be affected by U.S. Federal and state regulation


                                       5


of natural gas and crude oil production  and  transportation,  general  economic
conditions and changes in supply and demand.  These factors and the availability
of markets are beyond our control.  If market factors  dramatically  change, the
financial  impact on us could be substantial and adversely affect our ability to
produce and market natural gas and crude oil.

     Hedging transactions have in the past and may in the future impact our cash
flow from operations.

     We enter into hedging arrangements from time to time to reduce our exposure
to  fluctuations  in  natural  gas and  crude oil  prices  and to  achieve  more
predictable  cash flow. In 2002 and 2003, we  experienced  hedging costs of $1.5
million  and  $842,000,  respectively;  resulting  from the  price  ceilings  we
established being exceeded by the index prices.  For the year ended December 31,
2004, we recognized a gain from hedging  activities of  approximately  $118,000.
Currently,  we believe our hedging arrangements,  which are in the form of price
floors,  do not expose us to significant  financial  risk.  Although our hedging
activities  may limit our  exposure  to  declines  in natural  gas and crude oil
prices, such activities may also limit, and have in the past limited, additional
revenues from increases in natural gas and crude oil prices.

     We cannot assure you that the hedging transactions we have entered into, or
will  enter  into,  will  adequately  protect  us  from  financial  loss  due to
circumstances such as:

     o   highly volatile natural gas and crude oil prices;

     o   our production being less than expected; or

     o   a  counterparty  to one of our hedging  transactions  defaulting on our
         contractual obligations.

     We have experienced recurring significant operating losses.

     We recorded  net losses  from  continuing  operations  for 2002 and 2003 of
$55.2  million and $14.1  million,  respectively.  We  recorded  net income from
continuing operations for 2004 of $7.8 million,  which includes $12.6 million of
gain on debt  extinguishment  relating to our  October  2004  refinancing  and a
deferred tax benefit of $6.1 million.

     Lower  natural  gas and  crude  oil  prices  increase  the risk of  ceiling
limitation write-downs.

     We use the full cost  method to account  for our  natural gas and crude oil
operations.  Accordingly,  we  capitalize  the cost to acquire,  explore for and
develop natural gas and crude oil properties.  Under full cost accounting rules,
the net capitalized  cost of natural gas and crude oil properties may not exceed
a "ceiling limit" which is based upon the present value of estimated  future net
cash flows from proved reserves,  discounted at 10%. If net capitalized costs of
natural gas and crude oil properties  exceed the ceiling  limit,  we must charge
the  amount of the  excess to  earnings.  This is called a  "ceiling  limitation
write-down."  This charge does not impact cash flow from  operating  activities,
but does reduce our stockholders' equity and earnings.  The risk that we will be
required  to  write-down  the  carrying  value  of  natural  gas and  crude  oil
properties increases when natural gas and crude oil prices are low. In addition,
write-downs may occur if we experience  substantial  downward adjustments to our
estimated proved reserves. An expense recorded in one period may not be reversed
in a subsequent  period even though higher  natural gas and crude oil prices may
have increased the ceiling applicable to the subsequent period.

     We have incurred  ceiling  limitation  write-downs in the past. At June 30,
2002, for example, we recorded a ceiling limitation write-down of $28.2 million.
We cannot assure you that we will not experience  additional  ceiling limitation
write-downs in the future.

     Use of our net operating loss carryforwards may be limited.

     At December 31, 2004, we had,  subject to the limitation  discussed  below,
$184.0 million of net operating loss carryforwards for U.S. tax purposes.  These
loss carryforwards will expire through 2022 if not utilized.  In addition, as to


                                       6


a portion  of the U.S.  net  operating  loss  carryforwards,  the amount of such
carryforwards  that we can use annually is limited under U.S. tax law. Moreover,
uncertainties  exist  as  to  the  future  utilization  of  the  operating  loss
carryforwards  under the  criteria  set forth  under  FASB  Statement  No.  109.
Therefore,  we have established a valuation allowance of $73.2 million and $73.0
million for deferred tax assets at December 31, 2003 and 2004, respectively.

     We depend on our  Chairman,  President and CEO and the loss of his services
could have an adverse effect on our operations.

     We depend to a large  extent on Robert L. G.  Watson,  our  Chairman of the
Board,  President and Chief Executive  Officer,  for our management and business
and financial contacts.  Mr. Watson may terminate his employment  agreement with
us at any time on 30 days notice,  but, if he terminates without cause, he would
not be  entitled  to the  severance  benefits  provided  under the terms of that
agreement.  Mr. Watson is not precluded from working for, with or on behalf of a
competitor  upon  termination of his  employment  with us. If Mr. Watson were no
longer able or willing to act as our  Chairman,  the loss of his services  could
have an adverse effect on our  operations.  In addition,  in connection with the
initial public  offering by our previously  wholly-owned  subsidiary,  Grey Wolf
Exploration  Inc.,  we, Grey Wolf and Mr.  Watson  agreed that Mr.  Watson would
continue to serve as our Chief Executive  Officer and President and as the Chief
Executive Officer for Grey Wolf, with Mr. Watson devoting two-thirds of his time
to his  positions  and duties with us and  one-third of his time to his position
and duties with Grey Wolf. In consideration for receiving Mr. Watson's services,
Grey Wolf  makes an annual  payment  to Abraxas  of  US$100,000  and  reimburses
Abraxas for Mr.  Watson's  expenses  incurred in connection  with providing such
services.

Risks Related to Our Industry

     Market   conditions  for  natural  gas  and  crude  oil,  and  particularly
volatility of prices for natural gas and crude oil, could  adversely  affect our
revenue, cash flows, profitability and growth.

     Our revenue,  cash flows,  profitability  and future rate of growth  depend
substantially  upon prevailing prices for natural gas and crude oil. Natural gas
prices affect us more than crude oil prices  because most of our  production and
reserves are natural gas.  Prices also affect the amount of cash flow  available
for capital  expenditures  and our ability to borrow  money or raise  additional
capital.  Lower prices may also make it uneconomical  for us to increase or even
continue current production levels of natural gas and crude oil.

     Prices for natural gas and crude oil are subject to large  fluctuations  in
response to  relatively  minor  changes in the supply and demand for natural gas
and crude oil,  market  uncertainty  and a variety of other  factors  beyond our
control, including:

     o   changes in foreign and  domestic  supply and demand for natural gas and
         crude oil;

     o   political stability and economic conditions in oil producing countries,
         particularly in the Middle East;

     o   general economic conditions;

     o   domestic and foreign governmental regulation; and

     o   the price and availability of alternative fuel sources.

     In addition to decreasing our revenue and cash flow from operations, low or
declining  natural  gas and crude oil  prices  could  have  additional  material
adverse effects on us, such as:

     o   reducing  the  overall  volume of natural gas and crude oil that we can
         produce   economically,   thereby  adversely   affecting  our  revenue,
         profitability  and cash flow and our ability to perform our obligations
         with respect to the notes;

                                       7


     o   reducing our borrowing base under the credit facility; and

     o   impairing  our  borrowing  capacity  and our  ability to obtain  equity
         capital.

     Estimates of our proved  reserves and future net revenue are  uncertain and
inherently imprecise.

     The process of  estimating  natural  gas and crude oil  reserves is complex
involving  decisions and  assumptions  in evaluating  the available  geological,
geophysical,  engineering  and economic data.  Accordingly,  these estimates are
imprecise. Actual future production, natural gas and crude oil prices, revenues,
taxes,   development   expenditures,   operating   expenses  and  quantities  of
recoverable  natural gas and crude oil reserves most likely will vary from those
estimated.  Any  significant  variance  could  materially  affect the  estimated
quantities and present value of reserves set forth in this report.  In addition,
we may  adjust  estimates  of proved  reserves  to reflect  production  history,
results of exploitation  and development,  prevailing  natural gas and crude oil
prices and other factors, many of which are beyond our control.

     The  estimates of our reserves  are based upon  various  assumptions  about
future production levels, prices and costs that may not prove to be correct over
time. In particular, estimates of natural gas and crude oil reserves, future net
revenue from proved reserves and the PV-10 thereof for the natural gas and crude
oil properties  described in this report are based on the assumption that future
natural  gas and crude oil prices  remain the same as natural  gas and crude oil
prices at December 31, 2004.  The sales prices as of such date used for purposes
of such  estimates were $4.94 per Mcf of natural gas and $41.01 per Bbl of crude
oil. This compares with $5.05 per Mcf of natural gas and $31.03 per Bbl of crude
oil as of  December  31,  2003.  These  estimates  also assume that we will make
future  capital  expenditures  of  approximately  $45.0 million in the aggregate
through 2019, with the majority expected to be incurred from 2005 to 2008, which
are necessary to develop and realize the value of proved undeveloped reserves on
our  properties.   Any  significant   variance  in  actual  results  from  these
assumptions  could also  materially  affect the estimated  quantity and value of
reserves set forth in this report.

     The present value of future net revenues referred to in this report may not
be the current market value of our estimated natural gas and crude oil reserves.
In accordance with SEC  requirements,  the estimated  discounted future net cash
flows from proved reserves are generally based on prices and costs as of the end
of the period of the estimate.  Actual future prices and costs may be materially
higher  or lower  than  the  prices  and  costs as of the end of the year of the
estimate.   Any  changes  in   consumption  by  natural  gas  purchasers  or  in
governmental  regulations  or taxation  will also affect  actual future net cash
flows.  The timing of both the production and the expenses from the  development
and production of natural gas and crude oil properties will affect the timing of
actual future net cash flows from proved  reserves and their present  value.  In
addition,  the 10% discount  factor,  which is required by the SEC to be used in
calculating  discounted  future net cash flows for  reporting  purposes,  is not
necessarily the most accurate  discount factor.  The effective  interest rate at
various times and the risks  associated with us or the natural gas and crude oil
industry in general will affect the accuracy of the 10% discount factor.

     Our  operations  are subject to the numerous risks of natural gas and crude
oil drilling and production activities.

     Our  natural  gas and crude oil  drilling  and  production  activities  are
subject to numerous  risks,  many of which are beyond our  control.  These risks
include  the risk of  fire,  explosions,  blow-outs,  pipe  failure,  abnormally
pressured formations and environmental  hazards.  Environmental  hazards include
oil spills,  natural gas leaks,  ruptures  and  discharges  of toxic  gases.  In
addition,  title  problems,  weather  conditions and mechanical  difficulties or
shortages  or delays in  delivery  of drilling  rigs and other  equipment  could
negatively  affect our  operations.  If any of these or other  similar  industry
operating risks occur, we could have substantial losses. Substantial losses also
may result  from  injury or loss of life,  severe  damage to or  destruction  of
property, clean-up responsibilities,  regulatory investigation and penalties and
suspension of  operations.  In accordance  with industry  practice,  we maintain
insurance  against some, but not all, of the risks  described  above.  We cannot
assure you that our insurance  will be adequate to cover losses or  liabilities.


                                       8


Also,  we cannot  predict the  continued  availability  of  insurance at premium
levels that justify its purchase.

     We operate in a highly competitive  industry which may adversely affect our
operations,  including our ability to secure  drilling  equipment to service our
core areas.

     We operate in a highly  competitive  environment.  The principal  resources
necessary for the  exploration  and  production of natural gas and crude oil are
leasehold  prospects  under  which  natural  gas and crude oil  reserves  may be
discovered, drilling rigs and related equipment to explore for such reserves and
knowledgeable  personnel  to conduct  all  phases of  natural  gas and crude oil
operations.  We must compete for such  resources with both major natural gas and
crude oil companies and independent  operators.  Many of these  competitors have
financial and other resources  substantially  greater than ours. In the past, we
have had difficulty  securing  drilling  equipment in certain of our core areas.
Although we believe our current  operating and financial  resources are adequate
to preclude  any  significant  disruption  of our  operations  in the  immediate
future, we cannot assure you that such materials and resources will be available
to us.

     Our natural gas and crude oil  operations  are subject to various  Federal,
state and local regulations that materially affect our operations.

     Matters  regulated  include permits for drilling  operations,  drilling and
abandonment  bonds,  reports  concerning  operations,  the  spacing of wells and
unitization and pooling of properties and taxation. At various times, regulatory
agencies have imposed price controls and limitations on production.  In order to
conserve  supplies of natural gas and crude oil, these agencies have  restricted
the rates of flow of natural  gas and crude oil wells  below  actual  production
capacity. Federal, state and local laws regulate production,  handling, storage,
transportation  and  disposal  of natural  gas and crude oil,  by-products  from
natural gas and crude oil and other substances and materials produced or used in
connection with natural gas and crude oil operations.  To date, our expenditures
related  to  complying   with  these  laws  and  for   remediation  of  existing
environmental contamination have not been significant. We believe that we are in
substantial  compliance with all applicable laws and regulations.  However,  the
requirements  of such laws and  regulations  are frequently  changed.  We cannot
predict the ultimate cost of compliance with these  requirements or their effect
on our operations.


Risks Related to the Common Stock

     We do not pay dividends on common stock.

     We have never paid a cash dividend on our common stock and the terms of the
revolving  credit  facility  and the  indenture  relating to the notes limit our
ability to pay dividends on our common stock.

     Shares eligible for future sale may depress our stock price.

     At August 1, 2005, we had 41,966,500  shares of common stock outstanding of
which  4,374,106  shares were held by  affiliates  and, in  addition,  2,511,123
shares of common stock were subject to outstanding options granted under certain
stock option plans (of which 2,193,611 shares were vested at August 1, 2005).

     All of the shares of common  stock held by  affiliates  are  restricted  or
control  securities  under Rule 144  promulgated  under the Securities  Act. The
shares of the common stock issuable upon exercise of the stock options have been
registered  under the Securities Act. Sales of shares of common stock under Rule
144 or another  exemption under the Securities Act or pursuant to a registration
statement could have a material  adverse effect on the price of the common stock
and could  impair our ability to raise  additional  capital  through the sale of
equity securities.

                                       9


     The price of our  common  stock has been  volatile  and could  continue  to
fluctuate substantially.

     Our common stock is traded on The American Stock Exchange. The market price
of our common stock has been volatile and could fluctuate substantially based on
a variety of factors, including the following:

     o   fluctuations in commodity prices;

     o   variations in results of operations;

     o   legislative or regulatory changes;

     o   general trends in the industry;

     o   market conditions; and

     o   analysts'  estimates  and other events in the natural gas and crude oil
         industry.

     We may issue shares of preferred  stock with greater rights than our common
stock.

     Subject  to the rules of The  American  Stock  Exchange,  our  articles  of
incorporation  authorize  our board of  directors to issue one or more series of
preferred  stock and set the terms of the preferred  stock  without  seeking any
further  approval from holders of our common stock.  Any preferred stock that is
issued may rank ahead of our common  stock in terms of  dividends,  priority and
liquidation premiums and may have greater voting rights than our common stock.

     Anti-takeover  provisions  could make a third party  acquisition of Abraxas
difficult.

     Our articles of incorporation  and bylaws provide for a classified board of
directors, with each member serving a three-year term, and eliminate the ability
of stockholders to call special meetings or take action by written consent. Each
of the provisions in the articles of incorporation and bylaws could make it more
difficult  for a third  party to acquire  Abraxas  without  the  approval of our
board.  In  addition,   the  Nevada  corporate  statute  also  contains  certain
provisions that could make an acquisition by a third party more difficult.

     An active market may not develop for our common stock.

     Our common stock is quoted on The American Stock  Exchange.  While there is
currently one specialist in our common stock,  this  specialist is not obligated
to continue to make a market in our common stock.  In this event,  the liquidity
of our common stock could be adversely  impacted  and a  stockholder  could have
difficulty obtaining accurate stock quotes.

     Future  issuance  of  additional  shares of our common  stock  could  cause
dilution of ownership interests and adversely affect our stock price.

     We  may  in  the  future  issue  our  previously  authorized  and  unissued
securities,  resulting in the dilution of the ownership interests of our current
stockholders  and  purchasers of common stock offered  hereby.  We are currently
authorized  to issue  200,000,000  shares of common  stock  with such  rights as
determined by our board of directors.  The potential issuance of such additional
shares of common stock may create downward  pressure on the trading price of our
common stock. We may also issue  additional  shares of our common stock or other
securities that are convertible into or exercisable for capital raising or other
business purposes.  Future sales of substantial  amounts of common stock, or the
perception that sales could occur,  could have a material  adverse effect on the
price of our common stock.


                                       10


                                 USE OF PROCEEDS

     All of the shares of common stock covered by this prospectus are being sold
by the selling stockholders. See "Selling Stockholders." We will not receive any
proceeds from these sales of shares of our common stock.

                          DESCRIPTION OF CAPITAL STOCK

Common Stock

     Abraxas is currently authorized to issue up to 200,000,000 shares of common
stock, par value $.01 per share.

     As of August 1, 2005  there  were  41,966,500  shares of our  common  stock
issued and  outstanding.  Holders of the common  stock are  entitled to cast one
vote for  each  share  held of  record  on all  matters  submitted  to a vote of
stockholders  and are not  entitled  to  cumulate  votes  for  the  election  of
directors.  Holders of common stock do not have  preemptive  rights to subscribe
for additional shares of common stock issued by us.

     Holders of the common  stock are  entitled to receive  dividends  as may be
declared by the Board of Directors  out of funds  legally  available  therefore.
Under the terms of the first lien notes  indenture,  we may not pay dividends on
shares of our common stock. In the event of  liquidation,  holders of the common
stock are entitled to share pro rata in any distribution of our assets remaining
after  payment  of  liabilities,  subject to the  preferences  and rights of the
holders of any  outstanding  shares of preferred  stock.  All of the outstanding
shares of the common stock are fully paid and nonassessable.

Preferred Stock

     Our  articles of  incorporation  authorize  the issuance of up to 1,000,000
shares of preferred stock, par value $.01 per share, in one or more series.  The
Board  of  Directors  is   authorized,   without  any  further   action  by  the
stockholders,  to  determine  the dividend  rights,  dividend  rate,  conversion
rights, voting rights, rights and terms of redemption,  liquidation preferences,
sinking fund terms and other rights, preferences, privileges and restrictions of
any  series of  preferred  stock,  the  number of shares  constituting  any such
series, and the designation  thereof.  The rights of the holders of common stock
will be subject to, and may be  adversely  affected by, the rights of holders of
any preferred stock that may be issued in the future.

Option Plans

     Pursuant to our 2005 Non-Employee Director Long Term Equity Incentive Plan,
we also grant  non-qualified  stock options and restricted stock to non-employee
directors.  This plan is administered by the compensation committee and provides
that  each  year,  at the  first  regular  meeting  of the  Board  of  Directors
immediately  following  our  annual  stockholder's  meeting,  each  non-employee
director shall be granted or issued awards of 10,000 shares of our common stock,
for  participation in Board and Committee  meetings during the previous calendar
year.   Immediately  following  our  2005  annual  stockholder's  meeting,  each
non-employee director received  non-qualified stock options for 10,000 shares of
our common stock.

     The compensation  committee also administers our 1993 Key Contributor Stock
Option Plan, 1994 Long Term Incentive Plan,  Directors Restricted Share Plan and
Director  Stock  Option Plan,  each of which is now expired,  but under which we
previously granted  restricted stock,  incentive stock options and non-qualified
stock options as permitted by such plans.

     The  following   table  sets  forth  the  number  of  options   issued  and
outstanding,  the amount of those options  outstanding that are fully vested and
the average exercise price per share of such options under our 2005 Non-Employee
Director Long Term Equity  Incentive  Plan,  1993 Key  Contributor  Stock Option
Plan,  1994  Long Term  Incentive  Plan,  Directors  Restricted  Share  Plan and
Director Stock Option Plan, as of August 1, 2005:



                                       11




                                                                                                  Average
                                                                                                 Exercise
                                                 Options Issued and                              Price Per
                    Plan                             Outstanding          Options Vested           Share
---------------------------------------------    --------------------    ------------------    --------------
                                                                                            
2005 Non-Employee Director Long Term Equity
Incentive Plan                                            100,000             100,000             $ 2.75
              
1993 Key Contributor Stock Option Plan                     36,077              36,077             $ 2.46

1994 Long Term Incentive Plan                           1,730,046           1,546,868             $ 0.90 

Directors Restricted Share Plan                            75,000              75,000             $ 1.41
 
Director Stock Option Plan                                 75,000              75,000             $ 2.06
                                                 --------------------    ------------------    --------------
                                       Total            2,016,123           1,832,945             $ 1.10


We have also granted  options to purchase shares of our common stock pursuant to
individual option agreements not covered by any of the above-described plans, of
which,  as of August 1, 2005,  495,000 were  outstanding  and 360,666 were fully
vested at an average exercise price of $0.89 per share. As of August 1, 2005, in
the  aggregate  there were  options to purchase  2,511,123  shares of our common
stock  outstanding,  of which 2,193,611 were fully vested at an average exercise
price of $1.07 per share.

Anti-takeover Effects of Certain Provisions of the Articles of Incorporation and
Bylaws

     Our articles of incorporation and bylaws provide for the Board of Directors
to be divided  into three  classes of  directors  serving  staggered  three-year
terms.  As a result,  approximately  one-third of the Board of Directors will be
elected each year.  The articles of  incorporation  and bylaws  provide that the
Board of  Directors  will  consist of not less than  three nor more than  twelve
members,  with  the  exact  number  to be  determined  from  time to time by the
affirmative  vote of a  majority  of  directors  then in  office.  The  Board of
Directors,  and not the stockholders,  has the authority to determine the number
of directors.  This  provision  could  prevent any  stockholder  from  obtaining
majority  representation  on our Board of Directors  by  enlarging  the Board of
Directors  and by  filling  the new  directorships  with the  stockholder's  own
nominees.  In addition,  directors may be removed by the  stockholders  only for
cause.

     The articles of  incorporation  and bylaws provide that special meetings of
our  stockholders may be called only by the Chairman of the Board, the President
or a majority of the members of the Board of Directors.  This provision may make
it more  difficult  for  stockholders  to take  actions  opposed by the Board of
Directors.

     The articles of  incorporation  and bylaws provide that any action required
to be taken  or  which  may be taken by  holders  of our  common  stock  must be
effected at a duly called annual or special meeting of such holders, and may not
be taken by any written consent of such stockholders.  These provisions may have
the effect of delaying  consideration  of a stockholder  proposal until the next
annual  meeting  unless a special  meeting  is called by the  persons  set forth
above.  The provisions of the articles of incorporation  and bylaws  prohibiting
stockholder action by written consent could prevent the holders of a majority of
the voting  power of Abraxas  from using the written  consent  procedure to take
stockholder  action  and  taking  action by  consent  without  giving all of our
stockholders   entitled  to  vote  on  a  proposed  action  the  opportunity  to
participate in determining such proposed action.

                                       12


Anti-Takeover Statutes

     The  Nevada  General  Corporation  Law  (the  "Nevada  GCL")  contains  two
provisions,  described below as "Combination  Provisions" and the "Control Share
Act," that may make the unsolicited or hostile  attempts to acquire control of a
corporation through certain types of transactions more difficult.

     Restrictions on Certain Combinations  between Nevada Resident  Corporations
and Interested Stockholders.

     The Nevada GCL includes certain  provisions (the "Combination  Provisions")
prohibiting  certain  "combinations"   (generally  defined  to  include  certain
mergers,  disposition  of assets  transactions,  and share  issuance or transfer
transactions)  between  a  resident  domestic  corporation  and  an  "interested
stockholder" (generally defined to be the beneficial owner of 10% or more of the
voting  power  of the  outstanding  shares  of the  corporation),  except  those
combinations  which are approved by the board of directors before the interested
stockholder first obtained a 10% interest in the corporation's  stock. There are
additional  exceptions to the  prohibition,  which apply to combinations if they
occur more than three years after the interested stockholder's date of acquiring
shares.  The Combination  Provisions apply unless the corporation elects against
their  application  in its original  articles of  incorporation  or an amendment
thereto, or timely elected against their application in its bylaws no later than
October 31, 1991.  Our  articles of  incorporation  and bylaws do not  currently
contain a provision rendering the Combination Provisions inapplicable.

     Nevada Control Share Act.

     Nevada's  Control Share  Acquisition  Act (the "Control Share Act") imposes
procedural hurdles on and curtails greenmail practices of corporate raiders. The
Control  Share Act  temporarily  disenfranchises  the voting  power of  "control
shares" of a person or group  ("Acquiring  Person")  purchasing  a  "controlling
interest" in an "issuing  corporation" (as defined in the Nevada GCL) not opting
out of the Control  Share Act. In this regard,  the Control Share Act will apply
to an "issuing  corporation" unless, before an acquisition is made, the articles
of  incorporation or bylaws in effect on the tenth day following the acquisition
of a  controlling  interest  provide  that it is  inapplicable.  Our articles of
incorporation  and bylaws do not  currently  contain a provision  rendering  the
Control Share Act inapplicable.

     Under the  Control  Share Act, an "issuing  corporation"  is a  corporation
organized in Nevada which has 200 or more stockholders, at least 100 of whom are
stockholders  of record and  residents  of Nevada,  and which does  business  in
Nevada directly or through an affiliated company.  Our status at the time of the
occurrence of a transaction governed by the Control Share Act (assuming that our
articles of incorporation or bylaws have not theretofore been amended to include
an opting out  provision)  would  determine  whether  the  Control  Share Act is
applicable.

     The  Control  Share  Act  requires  an  Acquiring  Person  to take  certain
procedural  steps before such Acquiring  Person can obtain the full voting power
of the control  shares.  "Control  shares" are the shares of a  corporation  (1)
acquired or offered to be acquired which will enable the Acquiring Person to own
a "controlling  interest," and (2) acquired within 90 days immediately preceding
that date. A "controlling  interest" is defined as the ownership of shares which
would  enable  the  Acquiring  Person  to  exercise  certain  graduated  amounts
(beginning with one-fifth) of all voting power of the corporation. The Acquiring
Person may not vote any control shares without first obtaining approval from the
stockholders not characterized as "interested stockholders" (as defined below).

     To obtain voting rights in control shares, the Acquiring Person must file a
statement at the registered office of the issuer ("Offeror's Statement") setting
forth certain  information  about the  acquisition  or intended  acquisition  of
stock.   The  Offeror's   Statement  may  also  request  a  special  meeting  of
stockholders  to  determine  the voting  rights to be accorded to the  Acquiring
Person.  A special  stockholders'  meeting  must  then be held at the  Acquiring
Person's expense within 30 to 50 days after the Offeror's Statement is filed. If
a special meeting is not requested by the Acquiring  Person,  the matter will be
addressed at the next regular or special meeting of stockholders.

                                       13


     At the  special or annual  meeting  at which the issue of voting  rights of
control shares will be addressed,  "interested stockholders" may not vote on the
question of granting  voting  rights to control  the  corporation  or its parent
unless  the  articles  of  incorporation  of  the  issuing  corporation  provide
otherwise.  Our articles of incorporation  do not currently  contain a provision
allowing for such voting power.

     If  full  voting  power  is  granted  to  the   Acquiring   Person  by  the
disinterested stockholders, and the Acquiring Person has acquired control shares
with a majority or more of the voting power, then (unless otherwise  provided in
the articles of incorporation or bylaws in effect on the tenth day following the
acquisition of a controlling  interest) all  stockholders of record,  other than
the Acquiring Person,  who have not voted in favor of authorizing  voting rights
for the control shares, must be sent a "dissenter's notice" advising them of the
fact and of their right to receive "fair value" for their  shares.  Our articles
of  incorporation  and bylaws do not provide  otherwise.  By the date set in the
dissenter's  notice,  which may not be less than 30 nor more than 60 days  after
the dissenter's notice is delivered,  any such stockholder may demand to receive
from the  corporation  the "fair  value"  for all or part of his  shares.  "Fair
value" is defined in the Control  Share Act as "not less than the highest  price
per share paid by the Acquiring Person in an acquisition."

     The Control Share Act permits a corporation to redeem the control shares in
the following two instances,  if so provided in the articles of incorporation or
bylaws of the  corporation in effect on the tenth day following the  acquisition
of a  controlling  interest:  (1) if the  Acquiring  Person fails to deliver the
Offeror's  Statement  to the  corporation  within 10 days  after  the  Acquiring
Person's  acquisition of the control  shares;  or (2) an Offeror's  Statement is
delivered,  but the control  shares are not accorded  full voting  rights by the
stockholders.  Our  articles of  incorporation  and bylaws do not  address  this
matter.





                                       14



                              SELLING STOCKHOLDERS

     The shares of our common stock covered by this prospectus are being offered
by the selling  stockholders listed in the table below. This prospectus will not
cover  subsequent  sales of common stock  purchased  from a selling  stockholder
named in this prospectus.

     No offer or sale under this prospectus may be made by a stockholder  unless
that holder is listed in the table below,  in a supplement to this prospectus or
in an amendment to the related registration statement that has become effective.
We will  supplement  or amend  this  prospectus  to include  additional  selling
stockholders upon request and upon provision of all required  information to us,
subject  to the  terms of  registration  rights  agreements  between  us and the
selling stockholders.

     The following  table sets forth the name of each selling  stockholder,  the
nature of any position, office, or other material relationship which the selling
stockholder  has had,  within the past three  years,  with us or with any of our
predecessors   or  affiliates,   the  amount  of  shares  of  our  common  stock
beneficially  owned by such stockholder prior to the offering,  the amount being
offered  for the  stockholder's  account  and the  amount  to be  owned  by such
stockholders after completion of the offering.

     We prepared  the table based on  information  supplied to us by the selling
stockholders. We have not sought to verify such information.  Additionally,  the
selling stockholders may have sold or transferred some or all of their shares of
our common stock in transactions  exempt from the  registration  requirements of
the  Securities  Act since the date on which  the  information  in the table was
provided to us. Other information about the selling stockholders may also change
over time.



                                                                                      Number of Shares
                                        Number of Shares                              of Common Stock       Percentage of Shares
                                         of Common Stock       Number of Shares         Beneficially           of Common Stock
                                          Beneficially         of Common Stock           Owned After         Beneficially Owned
                                          Owned Prior           to Being Offered     Completion of the      After Completion of
               Name                       the Offering              Hereby                 Offering              the Offering
------------------------------------    ------------------    -------------------    -------------------    ----------------------

                                                                                                           
Bonanza Master Fund, Ltd.                       1,666,667             1,666,667              0                        *

Tonga Partners, L.P.                            1,030,472             1,030,472              0                        *

Guggenheim Corporate Funding,
LLC(1)                                            996,479               996,479              0                        *

Anegada Master Fund, Ltd.                         636,195               636,195              0                        *

Ironman Energy Capital LP                         463,333               463,333              0                        *

Blanco Partners, L.P.                             120,000               120,000              0                        *

Durham Capital Corporation(2)                     100,000               100,000              0                        *

Brian & Allison Grove                              83,333                83,333              0                        *
                           
* Less than 1%


(1) In connection with our October 2004 refinancing,  an affiliate of Guggenheim
Corporate Funding,  LLC,  Guggenheim Capital Markets,  LLC, acted as the initial
purchaser of our notes and Guggenheim  Corporate Funding,  LLC arranged for, and
acted as a lender and  administrative  agent  under,  certain term loans made to
Abraxas and our former wholly-owned, Canadian subsidiary, Grey Wolf Exploration,
Inc. These term loans have since been repaid in their entirety.

(2) Durham advised us in connection with our October 2004 refinancing.



                                       15



                              PLAN OF DISTRIBUTION

     Our common stock is being registered to permit public secondary  trading of
these securities by the selling stockholders from time to time after the date of
this prospectus. We have agreed, among other things, to bear all expenses (other
than  underwriting  discounts and selling  commissions)  in connection  with the
registration  and sale of the common stock covered by this  prospectus.  We will
not receive any of the  proceeds  from the  offering of the common  stock by the
selling stockholders.

     We  have  been  advised  by  the  selling  stockholders  that  the  selling
stockholders may sell all or a portion of the common stock beneficially owned by
them  and  offered  hereby  from  time to  time on any  exchange  on  which  the
securities are listed on terms to be determined at the times of such sales.  The
selling stockholders may also make private sales directly or through a broker or
brokers. Alternatively, the selling stockholders may from time to time offer the
common stock beneficially owned by them through underwriters, dealers or agents,
who may receive compensation in the form of underwriting discounts,  commissions
or concessions  from the selling  stockholders  and the purchasers of the common
stock for whom they may act as agent.  The  aggregate  proceeds  to the  selling
stockholders  from the sale of the common  stock will be the  purchase  price of
such common stock less discounts and commissions, if any.

     The common stock may be sold from time to time in one or more  transactions
at fixed offering prices,  which may be changed, or at varying prices determined
at the time of sale or at negotiated prices.  These prices will be determined by
the  holders of such  securities  or by  agreement  between  these  holders  and
underwriters  or dealers  who may  receive  fees or  commissions  in  connection
therewith. These transactions may include block transactions or crosses. Crosses
are  transactions in which the same broker acts as an agent on both sides of the
trade.

     In  connection  with sales of our common  stock or  otherwise,  the selling
stockholders may enter into hedging  transactions with broker-dealers or others,
which may in turn  engage in short  sales of our  common  stock in the course of
hedging the positions they assume.  The selling  stockholders  may also sell our
common stock short and deliver our common stock to close out short positions, or
loan or pledge our common  stock to  broker-dealers  or others  that in turn may
sell such  securities.  The selling  stockholders may pledge or grant a security
interest  in some or all of our  common  stock  owned by them  and if a  selling
stockholder defaults in the performance of its secured obligations, the pledgees
or secured parties may offer and sell such selling  stockholder's pledged common
stock from time to time pursuant to this  prospectus.  The selling  stockholders
also may transfer and donate  shares of our common stock in other  circumstances
in which case the transferees,  donees, pledgees or other successors in interest
will be the selling  stockholders  for purposes of the  prospectus.  The selling
stockholders  may sell short our common stock and may deliver this prospectus in
connection  with such short sales and use the shares of our common stock covered
by the  prospectus  to cover such short sales.  In  addition,  any shares of our
common stock covered by this  prospectus  that qualify for sale pursuant to Rule
144 or any other available  exemption from registration under the Securities Act
may be sold under Rule 144 or such other available exemption.

     At the time a particular  offering of shares of our common stock covered by
this  prospectus  is  made,  a  prospectus  supplement,  if  required,  will  be
distributed  which will set forth the  aggregate  number of shares of our common
stock being offered and the terms of the  offering,  including the name or names
of any  underwriters,  dealers,  brokers or agents,  if any, and any  discounts,
commissions  or  concessions  allowed  or  reallowed  to be paid to  brokers  or
dealers.

     Selling stockholders and any underwriters,  dealers,  brokers or agents who
participate  in the  distribution  of the  common  stock  may  be  deemed  to be
"underwriters"  within the meaning of the  Securities Act and any profits on the
sale of the common stock by them and any  discounts,  commissions or concessions
received by any such underwriters,  dealers,  brokers or agents may be deemed to
be underwriting discounts and commissions under the Securities Act.

     The  selling  stockholders  and  any  other  person  participating  in such
distribution will be subject to applicable provisions of the Securities Exchange
Act and the rules and regulations  thereunder,  including,  without  limitation,
Regulation  M which may limit the  timing of  purchases  and sales of the common
stock by the  selling  stockholders  and any  other  such  person.  Furthermore,


                                       16


Regulation M under the  Securities  Exchange Act may restrict the ability of any
person engaged in a  distribution  of the common stock being  distributed  for a
period  of  up  to  five  business  days  prior  to  the  commencement  of  such
distribution.  All of the foregoing may affect the  marketability  of the common
stock and the  ability  of any  person  or  entity  to  engage in  market-making
activities with respect to the common stock.

     We will use our reasonable  efforts to keep the  registration  statement of
which this prospectus is a part effective until the earliest of (a) the date all
common stock covered by this  prospectus has been sold or otherwise  transferred
pursuant to a  registration  statement or otherwise,  (b) the  expiration of 180
days following the holding period  applicable to such securities held by persons
that are not our  affiliates  under Rule 144(k) under the  Securities Act or any
successor provision,  subject to certain permitted exceptions,  and (c) the date
that is three  years  from the date  this  registration  statement  is  declared
effective by the SEC.

                                  LEGAL MATTERS

     The validity of the issuance of the common stock covered by this prospectus
has been passed upon for us by Cox Smith  Matthews  Incorporated,  San  Antonio,
Texas.

                                     EXPERTS

     The  consolidated  financial  statements of Abraxas as of December 31, 2004
and December 31, 2003 and for the years ended December 31, 2004 and December 31,
2003,  included  in this  prospectus  have been  audited  by BDO  Seidman,  LLP,
independent  registered  public  accounting  firm,  as  stated  in their  report
appearing herein (which report  expresses an unqualified  opinion and includes a
paragraph referring to a change in accounting method), and have been so included
in reliance  upon the report of such firm given upon their  authority as experts
in accounting and auditing.

     The  consolidated  financial  statements  of  Abraxas  for the  year  ended
December 31, 2002,  incorporated  in this  prospectus by reference from Abraxas'
Annual  Report  on Form  10-K for the year  ended  December  31,  2004 have been
audited by Deloitte & Touche LLP, independent registered public accounting firm,
as stated in their report,  which is incorporated herein by reference,  and have
been so  incorporated  in reliance upon the report of such firm given upon their
authority as experts in accounting and auditing.

     The historical  reserve  information  prepared by DeGolyer and  MacNaughton
included  in this  prospectus  has been  included  herein in  reliance  upon the
authority  of such firm as experts  with  respect to matters  contained  in such
reserve reports.

                       WHERE YOU CAN FIND MORE INFORMATION

     Our SEC filings are  available to the public over the Internet at the SEC's
web site at www.sec.gov.  You may also read and copy any document we file at the
SEC's public reference rooms located at 450 Fifth Street, N.W.,  Washington D.C.
20549.  Please call the SEC at  1-800-SEC-0330  for further  information  on the
public  reference  rooms and  their  copy  charges.  Also,  using  our  website,
www.abraxaspetroleum.com,  you can access electronic copies of documents we file
with the SEC,  including our annual reports on Form 10-K,  quarterly  reports on
Form 10-Q, and current  reports on Form 8-K and any amendments to those reports.
Information on our website is not  incorporated by reference in this prospectus.
Access to those  electronic  filings is  available  as soon as  practical  after
filing with the SEC.  You may also  request a copy of those  filings,  excluding
exhibits, at no cost by writing, emailing or telephoning our principal executive
office, which is:

                       500 North Loop 1604 East, Suite 100
                            San Antonio, Texas 78232
                              Attn: Chris Williford
                                 (210) 490-4788

                                       17


                           INCORPORATION BY REFERENCE

     The following  documents we filed with the SEC pursuant to the Exchange Act
are incorporated herein by reference:

     o   Our Annual  Report on Form 10-K for the fiscal year ended  December 31,
         2004, filed with the Commission on March 29, 2005;

     o   Our Quarterly Report on Form 10-Q for the quarter ended March 31, 2005,
         filed with the Commission on May 13, 2005;

     o   Our Quarterly  Report on Form 10-Q for the quarter ended June 30, 2005,
         filed with the Commission on August 10, 2005;

     o   Our Current  Report on Form 8-K filed with the  Commission  on February
         23, 2005;

     o   Our Current  Report on Form 8-K filed with the  Commission  on March 3,
         2005;

     o   Our Current  Report on Form 8-K filed with the  Commission  on April 5,
         2005;

     o   Our  Current  Report on Form 8-K filed with the  Commission  on June 6,
         2005;

     o   Our Current  Report on Form 8-K filed with the  Commission  on July 22,
         2005; and

     o   The  description  of our common  stock  contained  in our  Registration
         Statement  on Form  8-A,  filed  on  August  17,  2000,  including  any
         amendments   or  reports   filed  for  the  purpose  of  updating  such
         description.

     All documents filed by us pursuant to Sections 13(a), 13(c), 14 or 15(d) of
the Exchange Act (excluding any information  furnished  pursuant to Item 2.02 or
Item 7.01 on any  current  report on Form  8-K)  subsequent  to the date of this
filing  and  prior to the  termination  of this  offering  shall be deemed to be
incorporated  in this  prospectus  and to be a part  hereof from the date of the
filing of such document.  Any statement contained in a document  incorporated by
reference  herein shall be deemed to be modified or superseded  for all purposes
to the extent that a statement  contained  in this  prospectus,  or in any other
subsequently  filed  document  which  is  also  incorporated  or  deemed  to  be
incorporated by reference,  modifies or supersedes such statement. Any statement
so  modified  or  superseded  shall  not be  deemed,  except as so  modified  or
superseded, to constitute a part of this prospectus.

                                GLOSSARY OF TERMS

     Unless  otherwise  indicated  in this  prospectus,  natural gas volumes are
stated at the legal pressure base of the State or area in which the reserves are
located at 60 degrees  Fahrenheit.  Natural gas equivalents are determined using
the ratio of six Mcf of natural  gas to one barrel of crude oil,  condensate  or
NGLs.

     The following  definitions  shall apply to the technical terms used in this
prospectus.

Terms used to describe quantities of natural gas and crude oil

                  "Bbl" -- barrel or barrels.

                  "Bcf" -- billion cubic feet.

                  "Bcfe" -- billion cubic feet equivalent.

                  "BoE" -- barrels of

                  "MBbl" -- thousand barrels.

                  "Mcf" -- thousand cubic feet.

                  "Mcfe" -- thousand cubic feet equivalent.

                                       18


                  "MMBbls" -- million barrels.

                  "MMBTU" -- million British Thermal Units.

                  "MMcf" -- million cubic feet.

                  "MMcfe" -- million cubic feet equivalent.

                  "MMcfpd" -- million cubic feet per day.

Terms used to describe our interests in wells and acreage

                  "Developed  acreage"  means  acreage  which  consists of acres
     spaced or assignable to productive wells.

                  "Gross"  natural  gas and crude oil wells or "gross"  wells or
     acres is the number of wells or acres in which we have an interest.

                  "Net"  natural  gas and  crude  oil  wells or "net"  acres are
     determined by multiplying "gross" wells or acres by our working interest in
     such wells or acres.

                  "Productive"  well means an exploratory or a development  well
     that is not a dry hole.

                  "Undeveloped  acreage"  means leased acres on which wells have
     not been drilled or  completed to a point that would permit the  production
     of commercial  quantities of natural gas and crude oil,  regardless whether
     or not such acreage contains proved reserves.

Terms used to assign a present value to or to classify our reserves

                  "PV-10" means  estimated  future net revenue,  discounted at a
     rate of 10% per  annum,  before  income  taxes  and  with no  price or cost
     escalation or  de-escalation  in accordance with guidelines  promulgated by
     the SEC.

                  "Proved  reserves" or  "reserves"  means natural gas and crude
     oil,  condensate  and NGLs on a net  revenue  interest  basis,  found to be
     commercially recoverable.

                  "Proved  undeveloped  reserves" includes those proved reserves
     expected  to be  recovered  from new  wells on  undrilled  acreage  or from
     existing  wells  where a  relatively  major  expenditure  is  required  for
     recompletion.

Terms used to describe costs

                  "DD&A" means depletion, depreciation and amortization.

                  "LOE" means lease operating expenses and production taxes.

Terms used to describe types of wells

                  "Development well" means a well drilled within the proved area
     of a natural  gas or crude  oil  reservoir  to the  depth of  stratigraphic
     horizon (rock layer or formation) known to be productive for the purpose of
     extraction of proved natural gas or crude oil reserves.

                  "Dry hole" means an exploratory  or development  well found to
     be incapable of producing either crude oil or gas in sufficient  quantities
     to justify completion as a natural gas or crude oil well.

                                       19


                  "Exploratory  well"  means a well  drilled to find and produce
     natural gas or crude oil in an unproved  area, to find a new reservoir in a
     field previously found to be producing  natural gas or crude oil in another
     reservoir, or to extend a known reservoir.

                  "Productive  wells" mean producing  wells and wells capable of
     production.

                  "Service Well" is a well used for water injection in secondary
         recovery projects or for the disposal of produced water.

Other terms

                  "Charge" means an encumbrance,  lien,  claim or other interest
     in property securing payment or performance of an obligation.

                  "EBITDA"  means  earnings from before  income taxes,  interest
     expense, DD&A and other non-cash charges.

                  "NGL" means natural gas liquid.

                  "NYMEX" means the New York Mercantile Exchange.



                                       20


                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
     

Item 14.  Other Expenses of Issuance and Distribution

         The following statement sets forth the estimated amounts of expenses,
other than underwriting discounts, to be borne by us in connection with the
offering described in this Registration Statement:

Securities and Exchange Commission Registration Fee............$           2,741
Printing and Engraving Expenses................................$           1,000
Accounting Fees and Expenses....................................$         40,000
Legal Fees and Expenses.........................................$         15,000
Listing Fee.....................................................$         45,000
Miscellaneous Expenses..........................................$         25,000
                                                                 ---------------
         Total Expenses..........................................$       128,741
                                                                  ==============
Item 15.  Indemnification of Directors And Officers

     Our  articles of  incorporation  contain a provision  that  eliminates  the
personal monetary liability of directors and officers to us and our stockholders
for a breach of  fiduciary  duties to the  extent  currently  allowed  under the
Nevada General  Corporation  Law (the "Nevada  Statute").  To the extent certain
claims  against  directors or officers are limited to equitable  remedies,  this
provision  of our  articles  of  incorporation  may  reduce  the  likelihood  of
derivative  litigation  and  may  discourage  stockholders  or  management  from
initiating  litigation against directors or officers for breach of their duty of
care. Additionally,  equitable remedies may not be effective in many situations.
If a  stockholder's  only  remedy is to enjoin  the  completion  of the Board of
Director's  action,  this remedy would be ineffective if the stockholder did not
become aware of a  transaction  or event until after it had been  completed.  In
such a  situation,  it is possible  that we and our  stockholders  would have no
effective remedy against the directors or officers.

     Liability  for  monetary  damages  has  not  been  eliminated  for  acts or
omissions which involve intentional misconduct,  fraud or a knowing violation of
law or payment of an improper  dividend in  violation  of section  78.300 of the
Nevada  Statute.  The  limitation of liability  also does not eliminate or limit
director liability arising in connection with causes of action brought under the
Federal securities laws.

     The Nevada  Statute  permits a corporation  to indemnify  certain  persons,
including officers and directors, who are (or are threatened to be made) parties
against  all  expenses  (including  attorneys'  fees)  actually  and  reasonably
incurred by, or imposed upon,  him in  connection  with the defense by reason of
his being or having  been a director or officer if he acted in good faith and in
a manner  which  he  reasonably  believed  to be in or not  opposed  to the best
interests  of the  corporation  and,  with  respect  to any  criminal  action or
proceeding,  had no reasonable cause to believe his conduct was unlawful, except
where he has been  adjudged  by a court of  competent  jurisdiction  (and  after
exhaustion  of all  appeals)  to be  liable  for  gross  negligence  or  willful
misconduct in the performance of duty. Our bylaws provide indemnification to the
same extent allowed pursuant to the foregoing provisions of the Nevada Statute.

     Nevada  corporations  also are  authorized  to obtain  insurance to protect
officers and directors from certain liabilities,  including  liabilities against
which the corporation cannot indemnify its directors and officers.  We currently
have a directors' and officers'  liability  insurance policy in effect providing
$10.0 million in coverage and an additional $1.0 million in coverage for certain
employment related claims.

     We have entered into  indemnity  agreements  with each of our directors and
officers.  These agreements provide for  indemnification to the extent permitted
by the Nevada Statute.

                                   II-1






Item 16.  Exhibits

     The  following  Exhibits  either  are  filed  as part of this  registration
statement or incorporated by reference to documents  previously filed or will be
filed by amendment.  Exhibit numbers correspond to the exhibits required by Item
601 of Regulation S-K.

Exhibit
Number        Description

4.1           Articles of  Incorporation  of  Abraxas.  (Filed as Exhibit 3.1 to
              Abraxas'  Registration  Statement on Form S-4, No.  33-36565  (the
              "S-4 Registration Statement")).

4.2           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated  October  22,  1990.  (Filed  as  Exhibit  3.3  to  the  S-4
              Registration Statement).

4.3           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated  December  18,  1990.  (Filed  as  Exhibit  3.4 to  the  S-4
              Registration Statement).

4.4           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated June 8, 1995. (Filed as Exhibit 3.4 to Abraxas' Registration
              Statement  on Form  S-3,  No.  333-00398  (the  "S-3  Registration
              Statement")).

4.5           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated as of August 12,  2000.  (Filed as Exhibit  3.5 to  Abraxas'
              Annual Report of Form 10-K filed April 2, 2001).

4.6           Amended and Restated  Bylaws of Abraxas.  (Filed as Exhibit 3.6 to
              Abraxas' Annual Report on Form 10-K filed April 5, 2002).

4.7           Specimen  Common Stock  Certificate of Abraxas.  (Filed as Exhibit
              4.1 to the S-4 Registration Statement).

4.8           Specimen Preferred Stock Certificate of Abraxas. (Filed as Exhibit
              4.2 to  Abraxas'  Annual  Report on Form  10-K  filed on March 31,
              1995).

5.1           Opinion of Cox Smith Matthews Incorporated.

23.1          Consent of BDO Seidman, LLP.

23.2          Consent of Deloitte & Touche LLP.

23.3          Consent of DeGolyer and MacNaughton.

23.4          Consent of Cox Smith  Matthews  Incorporated.  (Filed with Exhibit
              5.1)

24.1          Power of  Attorney of Craig S.  Bartlett,  Jr.  (Included  on page
              II-6).

24.2          Power of Attorney of Franklin A. Burke. (Included on page II-6).

24.3          Power of Attorney of Harold D. Carter. (Included on page II-6).

24.4          Power of Attorney of Ralph F. Cox. (Included on page II-6).

24.5          Power of Attorney of Barry J. Galt. (Included on page II-6).

24.6          Power of Attorney of Dennis E. Logue. (Included on page II-6).

                                      II-2


24.7          Power of Attorney of James C. Phelps. (Included on page II-6).

24.8          Power of Attorney of Joseph A. Wagda. (Included on page II-6).



                                      II-3



Item 17.  Undertakings

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors,  officers and controlling  persons of the
registrant,  the  registrant  has  been  advised  that  in  the  opinion  of the
Securities  and Exchange  Commission,  such  indemnification  is against  public
policy as expressed in the Act and is,  therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person in the successful defense of any action,  suit or proceeding)
is asserted by such director,  officer or controlling  person in connection with
the securities being  registered,  the registrant will, unless in the opinion of
its counsel the matter has been settled by  controlling  precedent,  submit to a
court of appropriate  jurisdiction the question whether such  indemnification by
it is against  public policy as expressed in the Act and will be governed by the
final adjudication of such issue.

     The undersigned registrant hereby undertakes:

               (1) To file, during any period in which offers or sales are being
         made, a post-effective  amendment to this registration statement (other
         than as  provided in the  proviso  and  instructions  to Item 512(a) of
         Regulation  S-K) (i) to  include  any  prospectus  required  by Section
         10(a)(3)  of the  Securities  Act  of  1933;  (ii)  to  reflect  in the
         prospectus  any facts or events arising after the effective date of the
         registration  statement  (or the most recent  post-effective  amendment
         thereof)  which,   individually  or  in  the  aggregate,   represent  a
         fundamental  change in the  information  set forth in the  registration
         statement;  and (iii) to include any material  information with respect
         to  the  plan  of   distribution   not  previously   disclosed  in  the
         registration  statement or any material  change to such  information in
         the registration statement.

               (2) That, for the purpose of determining  any liability under the
         Securities Act of 1933,  each such  post-effective  amendment  shall be
         deemed to be a new  registration  statement  relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

               (3) To  remove  from  registration  by means of a  post-effective
         amendment any of the securities being registered which remain unsold at
         the termination of the offering.

               (4) That,  for purposes of  determining  any liability  under the
         Securities Act of 1933, each filing of the  registrant's  annual report
         pursuant to Section 13(a) or Section 15(d) of the  Securities  Exchange
         Act of 1934 (and, where applicable,  each filing of an employee benefit
         plan's  annual  report  pursuant  to  section  15(d) of the  Securities
         Exchange  Act  of  1934)  that  is  incorporated  by  reference  in the
         registration  statement  shall  be  deemed  to  be a  new  registration
         statement relating to the securities offered therein,  and the offering
         of such  securities at that time shall be deemed to be the initial bona
         fide offering thereof.



                                      II-4



                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the Registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of San Antonio, State of Texas, on August 12, 2005.


                              ABRAXAS PETROLEUM CORPORATION
                             (Registrant)

                             By:      /s/ Robert L. G. Watson                   
                                      -----------------------------------------
                                      Robert L. G. Watson, Chairman of the
                                      Board, President and Chief
                                      Executive Officer

                                      II-5



                                POWER OF ATTORNEY

     We, the undersigned officers and directors of Abraxas Petroleum Corporation
hereby  constitute and appoint Chris E.  Williford our true and lawful  attorney
with  full  power  to him,  to sign for us and in our  names  in the  capacities
indicated  below,  the  Registration  Statement on Form S-3 filed herewith,  any
other  Registration  Statement  related  to the same  offering,  and any and all
amendments (including post-effective  amendments) to the Registration Statement,
and  generally  to do all  things  in our  name  and  behalf  in the  capacities
indicated  below to enable  Abraxas  Petroleum  Corporation  to comply  with the
provisions of the Securities Act of 1933, as amended,  and all  requirements  to
the  Securities  and Exchange  Commission,  hereby  ratifying and confirming our
signatures as they may be signed by our attorney to said Registration  Statement
and any and all amendments thereto.

     Pursuant to the  requirements  of the  Securities  Act of 1933, as amended,
this  Registration  Statement  has been signed by the  following  persons in the
capacities and on the dates indicated:



Signature                             Name and Title                      Date
---------                             --------------                      ----
                                                                    
/s/ Robert L. G. Watson               Chairman of the Board, President,   August 12, 2005
--------------------------------      Chief Executive Officer
Robert L. G. Watson                   Principal Executive Officer) and
                                      Director

/s/ Chris E. Williford                Executive Vice President,           August 12, 2005
--------------------------------      Treasurer, and Chief Financial
Chris E. Williford                    Officer (Principal Financial and
                                      Accounting Officer)

/s/ Robert W. Carington, Jr.          Executive Vice President            August 12, 2005
--------------------------------
Robert W. Carington, Jr.

/s/ Craig S. Bartlett, Jr.            Director                            August 12, 2005
--------------------------------
Craig S. Bartlett, Jr.

/s/ Franklin A. Burke                 Director                            August 11, 2005
--------------------------------
Franklin A. Burke

/s/ Harold D. Carter                  Director                            August 12, 2005
--------------------------------
Harold D. Carter

/s/ Ralph f. Cox                      Director                            August 12, 2005
--------------------------------
Ralph F. Cox

/s/ Barry J. Galt                     Director                            August 12, 2005
--------------------------------
Barry J. Galt

/s/ Dennis E. Logue                   Director                            August 11, 2005
--------------------------------
Dennis E. Logue

/s/ James C. Phelps                   Director                            August 12, 2005
--------------------------------
James C. Phelps

/s/ Joseph A. Wagda                   Director                            August 12, 2005
--------------------------------
Joseph A. Wagda




                                      II-6





                                  EXHIBIT INDEX

Exhibit
Number        Description

4.1           Articles of  Incorporation  of  Abraxas.  (Filed as Exhibit 3.1 to
              Abraxas'  Registration  Statement on Form S-4, No.  33-36565  (the
              "S-4 Registration Statement")).

4.2           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated  October  22,  1990.  (Filed  as  Exhibit  3.3  to  the  S-4
              Registration Statement).

4.3           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated  December  18,  1990.  (Filed  as  Exhibit  3.4 to  the  S-4
              Registration Statement).

4.4           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated June 8, 1995. (Filed as Exhibit 3.4 to Abraxas' Registration
              Statement  on Form  S-3,  No.  333-00398  (the  "S-3  Registration
              Statement")).

4.5           Articles of Amendment to the Articles of  Incorporation of Abraxas
              dated as of August 12,  2000.  (Filed as Exhibit  3.5 to  Abraxas'
              Annual Report of Form 10-K filed April 2, 2001).

4.6           Amended and Restated  Bylaws of Abraxas.  (Filed as Exhibit 3.6 to
              Abraxas' Annual Report on Form 10-K filed April 5, 2002).

4.7           Specimen  Common Stock  Certificate of Abraxas.  (Filed as Exhibit
              4.1 to the S-4 Registration Statement).

4.8           Specimen Preferred Stock Certificate of Abraxas. (Filed as Exhibit
              4.2 to  Abraxas'  Annual  Report on Form  10-K  filed on March 31,
              1995).

5.1           Opinion of Cox Smith Matthews Incorporated.

23.1          Consent of BDO Seidman, LLP.

23.2          Consent of Deloitte & Touche LLP.

23.3          Consent of DeGolyer and MacNaughton.

23.4          Consent of Cox Smith  Matthews  Incorporated.  (Filed with Exhibit
              5.1).

24.1          Power of  Attorney of Craig S.  Bartlett,  Jr.  (Included  on page
              II-6).

24.2          Power of Attorney of Franklin A. Burke. (Included on page II-6).

24.3          Power of Attorney of Harold D. Carter. (Included on page II-6).

24.4          Power of Attorney of Ralph F. Cox. (Included on page II-6).

24.5          Power of Attorney of Barry J. Galt. (Included on page II-6).

24.6          Power of Attorney of Dennis E. Logue. (Included on page II-6).

24.7          Power of Attorney of James C. Phelps.  (Included on page II-6).

24.8          Power of Attorney of Joseph A. Wagda. (Included on page II-6).