Filed by Abraxas Petroleum Corporation
                                                   (Commission File No. 0-19118)
                          Pursuant to Rule 425 Under the Securities Act of 1933,
                                                                     as amended,
                                        And Deemed Filed Pursuant to Rule 14a-12
                                      Under the Securities Exchange Act of 1934,
                                                                     as amended.
                                    Subject Company:  Grey Wolf Exploration Inc.
                                                        (no Commission File No.)


                                  NEWS RELEASE

               ABRAXAS PETROLEUM COMMENCES TENDER OFFER TO ACQUIRE
                   REMAINING GREY WOLF EXPLORATION INC. SHARES

SAN ANTONIO, TX (Aug. 1, 2001) - Abraxas Petroleum Corporation  (AMEX:ABP) today
announced that its wholly-owned subsidiary, Abraxas Acquisition Corporation, has
commenced  an exchange  tender  offer to acquire  any or all of the  outstanding
shares of Grey Wolf  Exploration  Inc.  (TSE:GWX) not currently owned by Abraxas
and its wholly-owned Canadian subsidiary, Canadian Abraxas Petroleum Limited, in
exchange  for 0.6 of a share of  Abraxas  common  stock.  Abraxas  and  Canadian
Abraxas  currently own  approximately  48.3% of Grey Wolf's  outstanding  common
stock.  The offer  expires at 5:00 p.m.,  Calgary  time,  on  September 5, 2001,
unless extended.

The offer is conditioned upon, among other things, there being validly deposited
under the offer and not properly  withdrawn,  a majority of the Grey Wolf common
shares not currently  owned by Abraxas and Canadian  Abraxas and approval by the
Abraxas  stockholders  of the  consummation of the offer and the issuance of the
shares of Abraxas common stock in the offer.

THIS PRESS RELEASE DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION  OF AN
OFFER TO EXCHANGE THE SECURITIES OF ABRAXAS FOR THE SECURITIES OF GREY WOLF. ANY
SUCH OFFER OR SOLICITATION WILL BE SUBJECT TO CERTAIN  CUSTOMARY  CONDITIONS AND
WILL BE MADE ONLY BY ABRAXAS'  PROSPECTUS AND OTHER  EXCHANGE  OFFER  MATERIALS,
WHICH  HAVE  BEEN  FILED  WITH  THE SEC AND  HAVE  BEEN  MAILED  TO GREY  WOLF'S
STOCKHOLDERS. GREY WOLF'S STOCKHOLDERS ARE URGED TO READ THESE DOCUMENTS BECAUSE
THEY CONTAIN  IMPORTANT  INFORMATION  ABOUT THE OFFER.  THE  DOCUMENTS  ARE ALSO
AVAILABLE  AT NO CHARGE FROM THE SEC'S WEB SITE,  WWW.SEC.GOV,  AND FROM ABRAXAS
PETROLEUM CORPORATION AT 500 NORTH LOOP 1604 EAST, SUITE 100, SAN ANTONIO, TEXAS
78232.

Abraxas Petroleum  Corporation is a San Antonio-based  crude oil and natural gas
exploration and production  company that also processes natural gas. It operates
in Texas,  Wyoming and western  Canada.  For  additional  information  about the
Company,  please  visit  our web  site,  www.abraxaspetroleum.com,  for the most
current  and  updated  information.  The web site is  updated  daily in order to
comply with the SEC Regulation FD (Fair Disclosure).

Safe Harbor for  forward-looking  statement:  Statements in this release looking
forward in time involve  known and unknown  risks and  uncertainties,  which may
cause the Company's actual results in future periods to be materially  different
from any future performance suggested in this release. Such factors may include,
but may not be  necessarily  limited to,  changes in the prices  received by the
Company for crude oil and natural gas. In addition,  the Company's  future crude
oil and natural gas production is highly  dependent upon the Company's  level of
success in  acquiring  or finding  additional  reserves.  Further,  the  Company
operates in an industry  sector where the value of securities is highly volatile
and may be  influenced  by  economic  and other  factors  beyond  the  Company's
control.  In the context of  forward-looking  information  provided  for in this
release,  reference is made to the  discussion  of risk factors  detailed in the
Company's filing with the Securities and Exchange  Commission during the past 12
months.

FOR MORE INFORMATION CONTACT:
Janice Herndon/Manager Corp. Communications
Telephone 210-490-4788
jherndon@abraxaspetroleum.com
www.abraxaspetroleum.com