ABRAXAS PETROLEUM CORP
S-3/A, 1996-05-07
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
   
As filed with the Securities and Exchange Commission on May 7, 1996.
    

                                                        Registration No. 333-398

- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

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

   
                               AMENDMENT NO. 3 TO
    

                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                         ABRAXAS PETROLEUM CORPORATION
             (Exact name of registrant as specified in its charter)


<TABLE>
<S>                                   <C>                                <C>
           Nevada                                1311                              74-2584033
(State or other jurisdiction of       (Primary Standard Industrial       (I.R.S. Employer Identification
incorporation or organization)        Classification Code Number)                    Number)
</TABLE>

                              Robert L. G. Watson
                             Chairman of the Board,
                     President and Chief Executive Officer
                      500 North Loop 1604 East, Suite 100
                           San Antonio, Texas  78232
                                 (210) 490-4788

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

                                    Copy to:

                                Steven R. Jacobs
                            Cox & Smith Incorporated
                       112 East Pecan Street, Suite 1800
                           San Antonio, Texas  78205
                                 (210) 554-5255

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As
soon as practicable after the effective date of this registration statement.

         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 investment reinvestment plans, 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.  [ ]
<PAGE>   2
         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.  [ ]

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

         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 THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.




                                      ii
<PAGE>   3
                             CROSS REFERENCE SHEET

<TABLE>
<S>      <C>                                           <C>
1.       Forepart of the Registration Statement        Facing   Page   of  Registration   Statement;   Cross
         and Outside Front Cover Page of               Reference Sheet; Outside Front Cover Page  of Page of
         Prospectus                                    Prospectus


2.       Inside Front And Outside Back Cover           Inside Front  Cover and Outside  Back Cover Pages  of
         Pages Of Prospectus                           Prospectus


3.       Summary Information, Risk Factors             Risk Factors
         and Ratio of Earnings to Fixed Charges


4.       Use of Proceeds                               Use of Proceeds


5.       Determination of Offering Price               Outside Front Cover Page of Prospectus



6.       Selling Security Holders                      Selling Stockholders


7.       Plan of Distribution                          Plan of Distribution


8.       Description of Securities to be               Description of Capital Stock
         Registered

9.       Interests of Named Experts and Counsel        Not Applicable


10.      Material Changes                              Recent Developments


11.      Incorporation of Certain Information          Documents Incorporated By Reference
         by Reference

12.      Disclosure of Commission Position             Not Applicable
         on Indemnification for Securities
         Act Liabilities
</TABLE>





                                      iii
<PAGE>   4
PROSPECTUS

                        3,325,000 Shares of Common Stock

                         ABRAXAS PETROLEUM CORPORATION
                 
                               ---------------

         This Prospectus relates to an aggregate of 3,325,000 shares (the
"Shares") of common stock, par value $.01 per share ("Common Stock"), of
Abraxas Petroleum Corporation, a Nevada corporation (the "Company"), that may
be offered from time to time by certain stockholders of the Company (the
"Selling Stockholders").  See "Selling Stockholders."  The Company will receive
no part of the proceeds of such sales.  See "Use of Proceeds."  Expenses (other
than commissions and discounts of underwriters, dealers or agents and attorneys
fees incurred by the Selling Stockholders) incurred in connection with this
offering are expected to be approximately $36,170.  All of such expenses will
be paid by the Company.

   
         This Prospectus contains forward-looking information that involves
risks and uncertainties and such information is subject to the assumptions set
forth in connection therewith and the information contained herein.
    

         The Company has been advised by the Selling Stockholders that they may
sell all or a portion of the Shares offered by this Prospectus from time to
time (i) on the NASDAQ Stock Market at prices prevailing at the time of such
sales, (ii) otherwise than on the NASDAQ Stock Market at market prices
prevailing at the time of sale or at negotiated prices, or (iii) by a
combination of the foregoing methods of sale.  The Selling Stockholders and any
broker, dealer or other agent executing sell orders on behalf of the Selling
Stockholders may be deemed to be "underwriters" within the meaning of the
Securities Act of 1933, as amended (the "Act"), in which event commissions
received by any such broker, dealer or agent may be deemed to be underwriting
commissions under the Act.  See "Plan of Distribution."

   
         The Company's Common Stock is traded on the NASDAQ Stock Market under
the symbol AXAS.  On May 3, 1996, the closing price for the Common Stock as
reported on the NASDAQ Stock Market was $5.63 per share.
    

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

         FOR A DISCUSSION OF CERTAIN RISK FACTORS THAT SHOULD BE CONSIDERED BY
PROSPECTIVE INVESTORS, SEE "RISK FACTORS" ON PAGES 3 TO 9.

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

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION
OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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

   
                  The date of this Prospectus is May 7, 1996.
    
<PAGE>   5
                             AVAILABLE INFORMATION

         The Company is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports, proxy
statements and other information can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the following Regional Offices of
the Commission: The Chicago Regional Office, Northwestern Atrium Center, 500
West Madison Street, Suite 1400, Chicago, Illinois 60661-2511, and the New York
Regional Office, 7 World Trade Center, 12th Floor, New York, New York 10007, at
prescribed rates.  Such reports, proxy statements and other information
concerning the Company can also be inspected at the offices of the National
Association of Securities Dealers, Inc., 1735 K Street, N.W., Washington, D.C.
20006.

                             ADDITIONAL INFORMATION

         The Company has filed a Registration Statement on Form S-3 under the
Act with respect to the Shares offered hereby (together with all amendments,
the "Registration Statement") with the Commission.  This Prospectus, filed as
part of the Registration Statement, constitutes a part of the Registration
Statement and does not contain all of the information set forth in the
Registration Statement and the exhibits and schedules thereto.  In addition,
certain documents filed by the Company with the Commission have been
incorporated by reference.  See "Documents Incorporated by Reference."  Such
additional information can be obtained from the Commission's principal office
in Washington, D.C.

                      DOCUMENTS INCORPORATED BY REFERENCE

         The following documents or portions thereof filed by the Company are
hereby incorporated by reference in this Prospectus:

         (i)     the Company's Annual Report on Form 10-K for the year ended
December 31, 1995;

         (ii)    the Company's Current Report on Form 8-K dated January 17,
1996;

   
         (iii)   the Company's Current Report on Form 8-K dated April 4, 1996,
as amended;
    

         (iv)    the description of the Company's Common Stock contained in the
Company's Registration Statement Number 0-19118 filed on March 26, 1991 on Form
8-A relating thereto; and





                                       2
<PAGE>   6
         (iv)    the description of the Company's Common Stock Purchase Rights
contained in the Company's Registration Statement Number 0-19118 filed on
December 7, 1994 on Form 8-A relating thereto.

         In addition, all documents subsequently filed by the Company pursuant
to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of
this Prospectus and prior to the termination of the offering of the Shares made
hereby shall be deemed to be incorporated by reference into this Prospectus and
to be a part hereof from the date of filing of such documents.  Any statement
contained herein or in a document incorporated or deemed to be incorporated by
reference herein shall be deemed to be modified or superseded for the purposes
of this Prospectus to the extent that a statement contained herein or in any
subsequently filed document which is or is deemed to be incorporated by
reference herein modifies or supersedes such statement.  Any such statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this Prospectus.

         The Company undertakes to provide without charge to each person to
whom a copy of this Prospectus is delivered, upon oral or written request of
such person, a copy of any and all of the documents incorporated by reference
herein (other than exhibits and schedules to such documents, unless such
exhibits or schedules are specifically incorporated by reference into such
documents).  Such requests should be directed to Chris E. Williford, Executive
Vice President, Treasurer and Chief Financial Officer, Abraxas Petroleum
Corporation, 500 North Loop 1604 East, Suite 100, San Antonio, Texas 78232 or
by telephone at (210) 490-4788.

                                  RISK FACTORS

         Prospective purchasers of the Shares offered hereby should carefully
consider, together with other information in this Prospectus, the following
risk factors that affect the Company.  

Industry Conditions; Impact on Company's Profitability

         The Company's revenues, profitability and future rate of growth are
substantially dependent upon prevailing prices for crude oil and natural gas.
Crude oil and natural gas prices can be extremely volatile and in recent years
have been depressed by excess total domestic and imported supplies.  Prices are
also affected by actions of state and local agencies, the United States and
foreign governments and international cartels.  While prices for crude oil and
natural gas increased during the fourth quarter of 1995 and remained at these
levels during the first quarter of 1996, there can be no assurance that these
levels for crude oil and natural gas prices can be sustained.  These external
factors and the volatile nature of the energy markets make it difficult to
estimate future prices of crude oil and natural gas.  Any substantial or
extended decline in the prices of crude oil and natural gas would have a
material adverse effect on the Company's financial condition and results of
operations, including reduced cash flow





                                       3
<PAGE>   7
and borrowing capacity.  All of these factors are beyond the control of the
Company.  Sales of crude oil and natural gas are seasonal in nature, leading to
substantial differences in cash flow at various times throughout the year.
Federal and state regulation of crude oil and natural gas production and
transportation, general economic conditions, changes in supply and changes in
demand all could adversely affect the Company's ability to produce and market
its crude oil and natural gas.  If market factors were to change dramatically,
the financial impact on the Company could be substantial.  The availability of
markets and the volatility of product prices are beyond the control of the
Company and thus represent a significant risk.

         In addition, declines in crude oil and natural gas prices might, under
certain circumstances, require a write- down of the book value of the Company's
crude oil and natural gas properties.  If such declines were severe enough,
they could result in the occurrence of an event of default under the Company's
credit agreement with First Union National Bank of North Carolina ("FUNB") that
could require the sale of some of the Company's producing properties under
unfavorable market conditions or require the Company to seek additional equity
capital.

Losses From Operations

         The Company has experienced recurring losses.  For the years ended
December 31, 1992, 1993, 1994 and 1995, and the Company recorded net losses of
$4.0 million, $2.4 million, $2.4 million and $1.2 million, respectively.  The
loss in 1992 included interest and other costs incurred by the Company of
$258,000 in connection with its indirect ownership of 87.4% of the outstanding
capital stock of a company which owned a bituminous coal mine located in
western Colorado (the "Eastside Mine") and a writedown in the Company's
carrying value of the Eastside Mine of $2.63 million and the loss in 1994
included a further writedown relating to the Company's decision to cease
operations at the Eastside Mine of $1.0 million representing the remaining
carrying value of the Eastside Mine.  No assurance can be given that the
Company will not experience operating losses in the future.

Leverage and Debt Service

         As of December 31, 1995, total debt and stockholders' equity were
approximately $41.6 million and $37.1 million, respectively. Based upon the
current level of operations, the Company believes that its cash flow from
operations as well as borrowing capabilities will be adequate to meet its
anticipated requirements for working capital, capital expenditures, interest
payments and scheduled principal payments through December 31, 1996.  There can
be no assurance, however, that the Company's business will continue to generate
cash flow from operations at or above current levels.  If the Company is unable
to generate cash flow from operations in the future to service its debt, it may
be required to refinance all or a portion of its existing debt or to obtain
additional financing.  There can be no assurance that such refinancing would be
possible or that any additional financing could be obtained.  If the Company





                                       4
<PAGE>   8
were unable to refinance its existing debt or obtain additional financing and
could not service its debt, FUNB could foreclose on substantially all of the
Company's producing properties because these properties are pledged to secure
the Company's indebtedness to FUNB.  The Company's ability to meet its debt
service obligations and to reduce its total debt will be dependent upon its
future performance, which, in turn, will be subject to general economic
conditions and to financial, business and other factors, including the prices
received by the Company for crude oil, natural gas and natural gas liquids,
affecting the operations of the Company, many of which are beyond its control.

         The Company's credit agreement with FUNB contains a number of
covenants, including the following:  (1) the ratio of current assets to current
liabilities (exclusive of any part of the loan which is current) shall not be
less than 1:1; and (2) as of the last day of each fiscal quarter, the ratio of
the Company's indebtedness, compared to annualized net income plus non cash
charges shall not be greater than 7.5 to 1.0.  The credit agreement also
contains covenants relating to maintaining corporate existence, maintaining
title to all of the collateral free and clear of all liens except for FUNB's
liens and those permitted by FUNB, maintaining all mineral interests in good
repair and in compliance with all laws, maintaining insurance, paying all
taxes, not paying dividends except as required on the Company's Series 1995-B
Preferred Stock and not selling any of the collateral securing the loans.  The
Company is currently in compliance with these covenants.

Operating Hazards; Uninsured Risks

         The nature of the crude oil and natural gas business involves certain
operating hazards such as crude oil and natural gas blowouts, explosions,
encountering formations with abnormal pressures, cratering and crude oil spills
and fires, any of which could result in damage to or destruction of crude oil
and natural gas wells, destruction of producing facilities, damage to life or
property, suspension of operations, environmental damage and possible liability
to the Company.  In accordance with customary industry practices, the Company
maintains insurance against some, but not all, of such risks and some, but not
all, of such losses.  The occurrence of such an event not fully covered by
insurance could have a material adverse effect on the financial condition and
results of operations of the Company.

Shares Eligible for Future Sale

   
         At May 3, 1996, the Company had 5,804,812 shares of Common Stock
outstanding of which 427,335 shares were held by affiliates.  Of the shares
held by non-affiliates, 1,330,000 shares were sold in November 1995 in a
private placement (the "Private Placement") of 1,330,000 units ("Units") each
consisting of one share of Common Stock and one Contingent Value Right ("CVR")
at a price of $8.00 per Unit.  In addition, at May 3, 1996, the Company had
353,810 shares of Common Stock subject to outstanding options granted under
certain stock option plans (of which 68,600
    





                                       5
<PAGE>   9
   
shares were vested at May 3, 1996), 437,500 shares issuable upon exercise of
warrants and up to 1,330,000 shares of Common Stock issuable upon maturity of
the CVRs in November 1996 or, if the Company elects to extend the maturity date
of the CVRs, up to 1,995,000 shares of Common Stock in November 1997.  The
actual number of shares issuable upon maturity of the CVRs is dependent upon
the difference between the target price (which is $10.00 in 1996 and $12.50 in
1997) and the median of the averages of the closing bid prices of the Common
Stock on the Nasdaq Stock Market during the three consecutive 20-trading day
periods immediately preceding the maturity date.  All of the shares of Common
Stock held by affiliates are restricted or control securities under Rule 144
promulgated under the Securities Act of 1933, as amended (the "Securities
Act").  The shares of Common Stock issuable upon exercise of the stock options
have been registered under the Securities Act.  In addition, the shares of
Common Stock issuable upon maturity of the CVRs have been registered under the
Securities Act and the shares of the Common Stock issuable upon exercise of the
warrants are subject to certain registration rights and, therefore, will be
eligible for resale in the public market after a registration statement
covering such shares has been declared effective.  Sales of shares of Common
Stock under Rule 144 or pursuant to a registration statement could have a
material adverse effect on the price of the Common Stock and could impair the
Company's ability to raise additional capital through the sale of its equity
securities.
    

Competition

         The Company encounters strong competition from major oil companies and
independent operators in acquiring properties and leases for the exploration
for, and production of, crude oil and natural gas.  Competition is particularly
intense with respect to the acquisition of desirable undeveloped crude oil and
natural gas leases.  The principal competitive factors in the acquisition of
such undeveloped crude oil and natural gas leases include the staff and data
necessary to identify, investigate and purchase such leases, and the financial
resources necessary to acquire and develop such leases.  Many of the Company's
competitors have financial resources, staff and facilities substantially
greater than those of the Company.  In addition, the producing, processing and
marketing of crude oil and natural gas is affected by a number of factors which
are beyond the control of the Company, the effect of which cannot be accurately
predicted.

         The principal raw materials and resources necessary for the
exploration and production of crude oil and natural gas are leasehold prospects
under which crude oil and natural gas reserves may be discovered, drilling rigs
and related equipment to explore for such reserves and knowledgeable personnel
to conduct all phases of crude oil and natural gas operations.  The Company
must compete for such raw materials and resources with both major crude oil and
natural gas companies and independent operators.  Although the Company believes
its current operating and financial resources are adequate to preclude any
significant disruption of its operations in the





                                       6
<PAGE>   10
immediate future, the continued availability of such materials and resources to
the Company cannot be assured.

Reliance on Estimates of Proved Reserves and Future Net Revenues; Depletion of
Reserves

         There are numerous uncertainties inherent in estimating quantities of
proved reserves and in projecting future rates of production and the timing of
development expenditures, including many factors beyond the control of the
Company.  The reserve data incorporated by reference in this Prospectus
represent only estimates.  In addition, the estimates of future net revenues
from proved reserves of the Company and the present value thereof are based
upon certain assumptions about future production levels, prices, and costs that
may not prove to be correct over time.  The rate of production from crude oil
and natural gas properties declines as reserves are depleted.  Except to the
extent the Company acquires additional properties containing proved reserves,
conducts successful exploration and development activities or, through
engineering studies, identifies additional behind-pipe zones or secondary
recovery reserves, the proved reserves of the Company will decline as reserves
are produced.  Future crude oil and natural gas production is therefore highly
dependent upon the Company's level of success in acquiring or finding
additional reserves.

Acquisition Risks

         The Company intends to continue acquiring producing crude oil and
natural gas properties or companies that own such properties.  Although the
Company performs a review of the acquired properties that it believes is
consistent with industry practices, such reviews are inherently incomplete.  It
generally is not feasible to review in depth every individual property involved
in each acquisition.  Ordinarily, the Company will focus its review efforts on
the higher- valued properties and will sample the remainder.  However, even an
in-depth review of all properties and records may not necessarily reveal
existing or potential problems nor will it permit a buyer to become
sufficiently familiar with the properties to assess fully their deficiencies
and capabilities.  Inspections may not always be performed on every well, and
environmental problems, such as ground water contamination, are not necessarily
observable even when an inspection is undertaken.  In addition, there can be no
assurance that the Company will be able to identify attractive acquisition
opportunities or consummate acquisitions in the future.

Title to Properties

         As is customary in the crude oil and natural gas industry, the Company
performs a minimal title investigation before acquiring undeveloped properties,
which generally consists of obtaining a title report from legal counsel
covering title to the major properties and due diligence reviews by independent
landmen of the remaining properties.  The Company believes that it has
satisfactory title to such properties in





                                       7
<PAGE>   11
accordance with standards generally accepted in the crude oil and natural gas
industry.  A title opinion is obtained prior to the commencement of any
drilling operations on such properties.  The Company's properties are subject
to customary royalty interests, liens incident to operating agreements, liens
for current taxes and other burdens, none of which the Company believes
materially interferes with the use of, or affect the value of, such properties.
All of the Company's properties are also subject to the liens of FUNB.

Government Regulation

         The Company's business is subject to certain federal, state and local
laws and regulations relating to the exploration for and development,
production and marketing of crude oil and natural gas, as well as environmental
and safety matters.  Such laws and regulations have generally become more
stringent in recent years, often imposing greater liability on a larger number
of potentially responsible parties.  Because the requirements imposed by such
laws and regulations are frequently changed, the Company is unable to predict
the ultimate cost of compliance with such requirements.  There is no assurance
that laws and regulations enacted in the future will not adversely affect the
Company's financial condition and results of operations.

Dependence on Key Personnel

         The Company depends to a large extent on Robert L. G. Watson, its
Chairman of the Board, President and Chief Executive Officer, for its
management and business and financial contacts.  The unavailability of Mr.
Watson would have a materially adverse effect on the Company's business.  The
Company's success is also dependent upon its ability to employ and retain
skilled technical personnel.  While the Company has not to date experienced
difficulties in employing or retaining such personnel, its failure to do so in
the future could adversely affect its business.  The Company has entered into
employment agreements with Mr. Watson and each of the Company's vice
presidents.  The employment agreements terminate on December 31, 1996 except
that the term may be extended for an additional year if by December 1 of the
prior year neither the Company nor the officer has given notice that it does
not wish to extend the term.  Except in the event of a change in control, Mr.
Watson's and each of the vice president's employment is terminable at will by
the Company for any reason, without notice or cause.

Dividend Policy

         The Company has never declared or paid any cash dividends to holders
of Common Stock and has no present intention to pay cash dividends to holders
of Common Stock in the future.  Under its credit agreement with FUNB, the
Company is prohibited from paying cash dividends on the Common Stock.





                                       8
<PAGE>   12
Limitations on the Availability of the Company's Net Operating Loss
Carryforwards

         As a result of the acquisition of certain partnership interests and
crude oil and natural gas properties in 1990 and 1991, an ownership change
under section 382 of the Internal Revenue Code of 1986, as amended ("Section
382"), occurred in December 1991.  Accordingly, it is expected that the use of
net operating loss carryforwards generated prior to December 31, 1991 of $6.9
million will be limited to approximately $235,000 per year.  As a result of the
issuance of additional shares of Common Stock for acquisitions and sales of
stock, an additional ownership change under Section 382 occurred in October
1993.  Accordingly, it is expected that the use of all net operating loss
carryforwards generated through October 1993, or $13.4 million, will be limited
to approximately $1.0 million per year subject to the lower limitations
described above.  Of the $13.4 million net operating loss carryforwards, it is
anticipated that the maximum net operating loss that may be utilized before it
expires is $7.2 million.  Future changes in ownership may further limit the use
of the Company's carryforwards.  In addition to the Section 382 limitations,
uncertainties exist as to the future utilization of the carryforwards under the
criteria set forth in FASB Statement No. 109, "Accounting for Income Taxes".
The Company established a valuation allowance of $5.7 million and $5.5 million
for deferred tax assets at December 31, 1995 and 1994, respectively.

   
    

Anti-Takeover Provisions

         The Company's Stockholder Rights Plan and certain provisions of the
Company's Articles of Incorporation and Bylaws and the Nevada General
Corporation Law may make it difficult to change control of the Company and
replace incumbent management.  See "Description of Capital Stock".


                                  THE COMPANY

         The Company is an independent energy company engaged in the
exploration for and acquisition, development and production of crude oil and
natural gas primarily along the Texas Gulf Coast and in the Permian Basin of
western Texas.  The Company's business strategy is to acquire and develop
producing crude oil and natural gas properties that contain the potential for
increased value through exploitation and development.  The Company seeks to
realize the potential in such acquisitions through workovers, recompletions,
secondary recovery operations and the drilling of development wells.

         The Company's principal offices are located at 500 North Loop 1604
East, Suite 100, San Antonio, Texas 78232 and its telephone number is (210)
490-4788.





                                       9
<PAGE>   13
                                USE OF PROCEEDS

         The Company will not receive any part of the proceeds from the sale of
the shares by the Selling Stockholders.  The Company, however, received net
proceeds of $10.1 million from the Private Placement on November 17, 1995.
Such proceeds were used to repay certain indebtedness to FUNB and for general
corporate purposes, including future acquisitions and the development of
existing properties.

                              RECENT DEVELOPMENTS

         On November 17, 1995, the Company completed the Private Placement and
received net proceeds of $10.1 million.  The Company issued 1,330,000 Units
each consisting of one share of Common Stock and one CVR.  The CVRs are
exchangeable for up to an aggregate of 1,995,000 shares of Common Stock.  See
"Description of Capital Stock."

   
         On March 21, 1996, the Company sold its 50% working interest in the
Portilla Field, San Patricio County, Texas, and 12% working interest in the
Happy Field, Garza County, Texas (together, the "Properties"), to Acco, LLC
("Acco").  A report prepared by independent petroleum engineers showed
estimated net proved reserves of 2.1 million barrels of crude oil and natural
gas liquids and 3.5 billion cubic feet of natural gas from these fields with a
present value (discounted 10%) of estimated future net cash flows (before
income taxes) of proved crude oil and natural gas reserves of $20.7 million at
January 1, 1996.  Acco subsequently contributed the Properties to Portilla -
1996, L.P., a Texas limited partnership (the "Partnership"), for a limited
partnership interest.  A subsidiary of the Company, Portilla - Happy
Corporation ("Portilla - Happy"), is the general partner of the Partnership.
    

   
         The aggregate purchase price received by the Company was $17.6
million, of which $2.0 million was used by Portilla - Happy to purchase a 25%
equity interest in the Partnership.  Prior to this payment, Portilla - Happy
did not have any interest in the Partnership.  Acco separately obtained the
release of the 50% overriding royalty interest in the Portilla Field owned by
the Commingled Pension Trust Fund (Petroleum II), the trustee of which is
Morgan Guaranty Trust Company of New York (the "Trust Fund"), for $11.9
million.  As a result of the purchase of the Properties, the Partnership is the
owner of all of the Company's and the Trust Fund's interests in the Portilla
Field and all of the Company's interest in the Happy Field.  The Partnership
will receive all of the revenues and pay all expenses associated with these
interests.  The Partnership also acquired certain machinery and equipment
previously owned by the Company and used at the Portilla Field and the
Company's 100% interest in a natural gas processing plant with capacity of
approximately 20 million cubic feet of natural gas per day located at the
Portilla Field (the "Plant").  The Partnership maintains bank accounts separate
from those of the Company.
    





                                       10
<PAGE>   14
   
         Acco financed the acquisition of the Properties by borrowing $21.75
million from Christiana Bank og Kreditkasse (the "Bank Loan").  The Bank Loan
is non-recourse to Portilla - Happy and is secured by the Properties and all of
the other assets of the Partnership including the Partnership's Available Cash
(as defined in the Partnership's Limited Partnership Agreement).  The
Partnership also received loans of $5.92 million from three pension trust funds
(the "Pension Fund Loans").  In connection with making the Pension Fund Loans,
the pension funds were granted an option to purchase a 74% overriding royalty
interest in the Properties (the "ORI Options").  The ORI Options may be
exercised by the payment to the Partnership of $5.92 million which payment may
be made either in cash, in exchange for the outstanding principal amount of the
Pension Fund Loans or by a combination thereof.
    

   
         The Company, through Portilla - Happy, owns a 25% equity interest in
the Partnership.  Prior to Acco's repayment of the Bank Loan and the receipt by
Acco and Portilla - Happy of 110% of their initial investments, Portilla -
Happy will receive 8% of the Partnership's Available Cash.  After these
repayment obligations have been satisfied, Portilla - Happy will receive 25% of
the Partnership's Available Cash until the Pension Fund Loans have been repaid
in full or, in the event that the pension funds exercise the ORI Option, when
the pension funds have received an aggregate of $8.88 million plus 10% of the
ORI Option price per annum (the "Required Override Payment").  After the
earlier of the time when the Required Override Payment has been made or, if the
ORI Options are not exercised, April 30, 2004 (the date that the Pension Fund
Loans mature), Portilla - Happy's share of Available Cash will increase to
43.75% and will stay at this level until the termination of the Partnership.
    

   
         The sale of the Properties is consistent with the Company's strategy
of selling its more mature properties.  Such sales enable the Company to
maintain financial flexibility, reduce overhead and redeploy the proceeds
therefrom to activities that the Company believes to have a potentially higher
financial return.  The sale of the Properties enabled the Company to repay
$12.0 million to FUNB and reduce its indebtedness to FUNB to $29.5 million.  At
March 31, 1996, the Company's availability under the FUNB line of credit was
$1.5 million which the Company anticipates will be used to fund development of
existing properties.  Of the remaining $5.6 million of the proceeds, $2.0
million was used to purchase the equity interest in the Partnership and $3.6
million was used for general corporate purposes, including future acquisitions
and development of existing properties.  To the extent not used, the proceeds
have been deposited in an interest bearing account and will be used by the
Company for its working capital needs including future acquisitions and
development of existing properties.
    

   
         During 1995, the Portilla and Happy Fields contributed $4.5 million in
revenues, $0.9 million in operating and production expenses and $1.7 million in
depreciation expense to the Company.  The repayment of $12.0 million of the
Company's indebtedness to FUNB would, on a pro forma basis if the Properties
had been sold on January 1, 1995, have reduced interest expense by $1.2 million
in 1995 and would
    





                                       11
<PAGE>   15
   
have decreased the Company's net income by $0.7 million in 1995.  Because the
Company will remain the operator of the Portilla Field and the Plant located at
the Portilla Field (the Happy Field will continue to be operated by Torch
Operating Company), there will not be any changes in the Company's operations
as a result of the sale.  The Partnership will be responsible for the payment
of all direct operating expenses associated with the Properties and the Plant.
The Company will not be reimbursed for any of its overhead expenses in
connection with the operation of the Properties and the Plant but will be
reimbursed for expenses incurred to third parties.
    

   
         On March 21, 1996, the Company also announced that its Board of
Directors had authorized the repurchase of up to $3.5 million of the Company's
Common Stock.  Such repurchases will be made from time to time either through
the open market or in privately negotiated transactions.  As of May 3, 1996,
the Company had purchased a total of 41,000 shares of Common Stock at an
aggregate purchase price of $210,125.
    

   
         In March 1996, the Compensation Committee of the Board of Directors
(the "Compensation Committee") approved a plan to amend the terms of the
Company's outstanding stock options to reduce the exercise price to $6.75 per
share.  Options to purchase a total of 353,810 shares, of which 68,600 shares
were vested, were affected.
    


                              SELLING STOCKHOLDERS

         This Prospectus relates to 3,325,000 shares of Common Stock that may
be offered and sold from time to time by the Selling Stockholders.  If all of
the shares of Common Stock offered hereby are actually sold, the Selling
Stockholders will own 783,300 shares of the Common Stock.

         The Selling Stockholders obtained the shares of the Common Stock
offered hereby in the Private Placement.

   
         The following table sets forth certain information as of May 3, 1996
with respect to the ownership of Common Stock by the Selling Stockholders:
    





                                       12
<PAGE>   16

<TABLE>
<CAPTION>
                             Shares of Common Stock                Shares of Common Stock  Shares of Common Stock
Name of Selling                Owned Prior to the                   to be Sold Pursuant     to be Owned After the
Stockholder                       Offering (1)      Percentage           Hereto (1)             Offering(1)       Percentage
- -----------                       ------------      ----------           ----------             -----------       ----------
<S>                               <C>                 <C>                   <C>                <C>                    <C>     
BT Holdings (2)                      275,000          4.75                  275,000                 0                  0      
                                                                                                                              
                                                                                                                              
Kayne, Anderson                      375,000          6.48                  375,000                 0                  0      
Management, Inc. (3)                                                                                                          
                                                                                                                              
State Street Research &              375,000          6.48                  375,000                 0                  0      
Management, Inc. (4)                                                                                                          
                                                                                                                              
Ralph Wanger                      516,000(5)          9.07                  110,000            406,000(6)             7.00    
                                                                                                                              
                                                                                                                              
Wellington Management                572,300          9.87                  195,000              377,300              6.51    
Company (7)                                                
</TABLE>

_____________

(1)      Does not include an aggregate of 1,995,000 shares of Common Stock
         which may be issued in exchange for the CVRs.
(2)      BT Holdings is an investment manager which has the power to make
         investment decisions for unrelated clients.
(3)      Kayne, Anderson Management, Inc. is an investment manager which has
         the power to make investment decisions for unrelated clients.
(4)      State Street Research & Management, Inc. ("State Street") is an
         investment manager which has the power to make investment decisions
         for unrelated clients.  State Street disclaims beneficial ownership of
         all of the shares of Common Stock listed above.
(5)      Includes 156,000 shares of Common Stock owned by the Acorn Investment
         Trust, Series Designated Acorn Fund (the "Trust").  Wanger Asset
         Management, Ltd. ("WAM Ltd.") is the general partner of Wanger Asset
         Management, L.P.  ("WAM") and Ralph Wanger is the general partner of
         WAM, Ltd.  WAM serves as investment advisor to the Trust.  Certain
         limited partners and employees of WAM are officers and trustees of the
         Trust.  The Trust has delegated to WAM shared voting and investment
         power over the shares owned by the Trust.  Does not include shares
         owned by clients of WAM over which WAM does not have or share voting
         or investment power.
(6)      Includes 156,000 shares of Common Stock owned by WAM and 250,000
         shares of Common Stock owned by the Trust.
(7)      Wellington Management Company is an investment manager which has the
         power to make investment decisions for unrelated clients.

         The Selling Stockholders do not have any partners, officers or
directors who are officers or directors of the Company and none of the Selling
Stockholders is an officer or director of the Company.





                                       13
<PAGE>   17
                              PLAN OF DISTRIBUTION

         This Prospectus relates to 3,325,000 shares of Common Stock that may
be offered and sold from time to time by the Selling Stockholders.

   
         As of May 3, 1996, the Selling Stockholders were the beneficial owners
of 2,113,300 shares of Common Stock.  Assuming all shares of Common Stock
offered hereby are actually sold, the Selling Stockholders will beneficially
own an aggregate of 783,300 shares of Common Stock.
    

         The Selling Stockholders have advised the Company that they intend to
sell all or a portion of the shares of Common Stock offered by this Prospectus
from time to time (i) in the over-the-counter market or on the NASDAQ Stock
Market at prices reasonably related to the prices of the Common Stock
prevailing at the time of such sales, (ii) otherwise than in the
over-the-counter market or on the NASDAQ Stock Market, in negotiated
transactions (which may include the pledge or hypothecation of some or all of
the shares), at fixed prices that may be changed, at market prices prevailing
at the time of sale or at prices reasonably related thereto or at negotiated
prices, or (iii) by a combination of the foregoing methods of sale.  The
Selling Stockholders may effect such transactions by selling the shares of
Common Stock to or through broker-dealers, and such broker-dealers may receive
compensation in the form of discounts, concessions or commissions from the
Selling Stockholders and/or the purchasers of the shares of Common Stock for
which such broker-dealers may act as agent or to whom they may sell as
principal, or both.  The Company is not aware as of the date of the Prospectus
of any agreement between the Selling Stockholders and any broker-dealers with
respect to the sale of the Shares offered by this Prospectus.  The Selling
Stockholders and any broker, dealer or other agent executing sell orders on
behalf of the Selling Stockholders may be deemed to be "underwriters" within
the meaning of the Securities Act, in which event commissions received by any
such broker, dealer or agent and profit on any resale of the shares of Common
Stock may be deemed to be underwriting commissions under the Securities Act.
Such commissions received by a broker, dealer or agent may be in excess of
customary compensation.

         In effecting the sale of the Shares offered by this Prospectus, the
Selling Stockholders must comply with Rule 10b-6 under the Exchange Act, which
will require that the Selling Stockholders, as well as any person who acts in
concert with the Selling Stockholders and the broker, if any, who sells the
Shares on behalf of the Selling Stockholders, suspend all purchases of shares
of the Common Stock at least two business days prior to and during any offers
and sales by the Selling Stockholders of the Shares offered by this Prospectus.
Because the Selling Stockholders may be deemed to be affiliates of the Company
under the Exchange Act, Rule 10b-6 also requires the Company and all persons
who are in a control relationship with the Company to suspend all purchases of
shares of the Common Stock at least two business days prior to and during any
offers and sales by the Selling Stockholders of the Shares offered by this
Prospectus.  The Company will require the Selling Stockholders, and their
underwriters, brokers or dealers, if applicable, to provide a





                                       14
<PAGE>   18
letter that acknowledges compliance with Rule 10b-6 before authorizing the
transfer of the Selling Stockholders' Shares.

                          DESCRIPTION OF CAPITAL STOCK

Common Stock

   
         The Company is authorized to issue 50,000,000 shares of Common Stock,
par value $.01 per share.  At May 3, 1996, there were 5,804,812 shares of
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 the Company.
    

         Holders of the Common Stock are entitled to receive dividends as may
be declared by the Board of Directors out of funds legally available therefor,
subject to the rights of the holders of the Series 1995-B Preferred Stock and
any subsequently issued classes or series of the Company's Preferred Stock.  No
dividend may be declared or paid on the Common Stock and no Common Stock may be
purchased by the Company, unless all accrued and unpaid dividends on the
outstanding Series 1995-B Preferred Stock for all past or current dividend
periods, if any, have been paid, except for a purchase of shares of the Common
Stock by the Company pursuant to Rule 13e-4(h)(5) of the Exchange Act.  In
addition, under the terms of the Company's Credit Agreement with FUNB, the
Company may not pay dividends on shares of the Common Stock.  In the event of
liquidation, holders of the Common Stock are entitled to share pro rata in any
distribution of the Company's assets remaining after payment of liabilities,
subject to the preferences and rights of the holders of the Series 1995-B
Preferred Stock.  All of the outstanding shares of the Common Stock are fully
paid and nonassessable.

         References herein to Common Stock include the common share purchase
rights distributed by the Company to its stockholders on November 17, 1994 as
long as they trade with the Common Stock.  See "Stockholder Rights Plan".

Preferred Stock

         General.  The Company's 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.





                                       15
<PAGE>   19
         Description of Series 1995-B Preferred Stock.  The Company is
authorized to issue 1,000,000 shares of Preferred Stock, of which 45,741 shares
have been designated as the Series 1995-B Preferred Stock.  The holders of the
Series 1995-B Preferred Stock have the full right and power to vote with the
holders of the Common Stock on all matters on which the stockholders of the
Common Stock are entitled to vote.  Holders of the Series 1995-B Preferred
Stock are entitled to 11.11 votes for each share of the Series 1995-B Preferred
Stock and are not entitled to cumulate votes in the election of directors.
Holders of the Series 1995-B Preferred Stock do not have preemptive rights to
subscribe for or to purchase any additional shares of the Series 1995-B
Preferred Stock.  All or any shares of the Series 1995-B Preferred Stock may be
redeemed at the option of the Company at any time after January 1, 1997 at $100
per share plus the amount of accrued and unpaid dividends.  If the Company
redeems, repurchases, exchanges any security or property for, or otherwise
acquires for consideration any shares of Common Stock (other than an
acquisition pursuant to Rule 13e- 4(h)(5) promulgated under the Exchange Act)
at a price equal to or greater than $100 divided by the number of shares of
Common Stock into which one share of the Series 1995-B Preferred Stock is then
convertible, any holder of shares of Series 1995-B Preferred Stock may require
the Company to redeem a number of shares of such holder's Series 1995-B
Preferred Stock equal to the product of (i) the percentage of the shares of the
Common Stock so redeemed or otherwise acquired times (ii) the total number of
shares of the Series 1995-B Preferred Stock held by such holder at a price per
share equal to the product of (x) the number of shares of Common Stock that
such holder's shares of Series 1995-B Preferred Stock is then convertible times
(y) the per share price paid for a share of Common Stock by the Company plus
all accrued and unpaid dividends.  Each share of Series 1995-B Preferred Stock
may be converted, subject to adjustment, into 11.11 shares of the Common Stock.

         Shares of the Series 1995-B Preferred Stock are entitled to a
cumulative dividend of $8.00 per share per annum payable on a quarterly basis,
when and if declared by the Board of Directors.  In the event of the
dissolution, liquidation or winding up of the Company, the holders of the
Series 1995-B Preferred Stock shall be entitled to receive an amount of money
equal to the  redemption price per share plus all accrued and unpaid dividends
thereon in cash or in any assets of the Company remaining after the debts of
the Company have been paid in full and before any payment is made or assets set
aside for payment to the holders of the Common Stock.  All outstanding shares
of the Series 1995-B Preferred Stock are fully paid and nonassessable.

Contingent Value Rights

         General.  The CVRs were issued under the CVR Agreement (the "CVR
Agreement") between the Company and FUNB, a form of which is filed as an
exhibit to the Registration Statement of which this Prospectus is a part. The
definitions of certain capitalized terms used in the following summary are set
forth below under "Certain Definitions."





                                       16
<PAGE>   20
         Issuance of Shares at Maturity Date or Extended Maturity Date.  The
CVR Agreement provides that, subject to adjustment as described under
"Antidilution" below, the Company shall issue to each holder of the CVRs (each
such person, a "CVR Holder") on the Maturity Date (as defined below), unless
the Company shall, in its sole discretion, extend the Maturity Date to the
Extended Maturity Date (as defined below), then on the Extended Maturity Date,
for each CVR held by such CVR Holder, the Company shall issue a number of
shares of Common Stock, if any, equal to (a) the Target Price (as defined
below) minus the Current Market Value divided by (b) the Current Market Value;
provided, however, in no event shall more than one share of Common Stock be
issued in exchange for each CVR at the Maturity Date or more than 1.5 shares of
Common Stock be issued in exchange for each CVR at the Extended Maturity Date.
Such determination by the Company absent manifest error shall be final and
binding on the Company and the CVR Holder.

         The Company may at its option extend the Maturity Date to the Extended
Maturity Date.  Such option shall be exercised by (i) publishing notice of an
extension in the Authorized Newspaper (as defined below) or (ii) furnishing
notice to the CVR Holders of such extension, in each case, not less than one
business day preceding the Maturity Date ; provided, however, that no defect in
any such notice shall affect the validity of the extension of the Maturity Date
to the Extended Maturity Date, and that any notice when published and mailed to
a CVR Holder whether or not actually received by such CVR Holder.

         Determination that No Shares are Issuable With Respect to the CVRs.
If the Current Market Value of a share of the Common Stock equals or exceeds
$10.00 on the Maturity Date or $12.50 on the Extended Maturity Date (if the
Maturity Date is extended by the Company to the Extended Maturity Date), as the
case may be, no shares of the Common Stock will be issuable with respect to the
CVRs.  In addition, the CVRs will terminate if the Per Share Market Value (as
defined below) equals or exceeds the Target Price for any period of 30
consecutive Trading Days during either the period (i) from and after November
17, 1995 to and including November 17, 1996 or (ii) from and after November 17,
1996 to and including November 17, 1997.

         In the event that the Company determines that no shares of the Common
Stock are issuable with respect to the CVRs to the CVR Holders, the Company
shall give to the CVR Holders notice of such determination.  Upon making such
determination and absent manifest error, the CVRs shall terminate and become
null and void and the CVR Holders shall have no further rights with respect
thereto.  The failure to give such notice or any defect therein shall not
affect the validity of such determination.

         Antidilution.  In the event the Company shall in any manner subdivide
(by stock split, stock dividend or otherwise) or combine (by reverse stock
split or otherwise) the number of outstanding shares of the Common Stock, the
Company shall similarly subdivide or combine the CVRs and shall approximately
adjust the Target Price.





                                       17
<PAGE>   21
Whenever such an adjustment is made, the Company shall (i) promptly prepare a
certificate setting forth such adjustment and a brief statement of the facts
accounting for such adjustment, (ii) promptly file with FUNB a copy of such
certificate and (iii) mail a brief summary thereof to each CVR Holder.  FUNB
shall be fully protected in relying on any such certificate and on any
adjustment therein contained.  Such adjustment absent manifest error shall be
final and binding on the Company and the CVR Holders.  Each outstanding CVR
Certificate shall thenceforth represent that number of adjusted CVRs necessary
to reflect such subdivision or combination and reflect the adjusted Target
Price.

   
         Consolidation, Merger and Sale of Assets.  The CVR Agreement provides
that the Company may, without the consent of the holders of any of the
outstanding CVRs, consolidate with or merge into any other entity or convey,
transfer or lease its properties and assets substantially as an entirety to any
entity, provided that (i) the Surviving Person (as defined below) assumes the
Company's obligations under the CVRs and the CVR Agreement and (ii) the Company
delivers to FUNB an officer's certificate regarding compliance with the
foregoing.  For the purposes hereof, "convey, transfer or lease its properties
and assets substantially as an entirety" shall mean properties and assets
contributing in the aggregate of at least 80% of the Company's total revenues
as reported in the Company's last available periodic financial report
(quarterly or annual, as the case may be) filed with the Commission.
    

   
         In the event that the Company were merged out of existence, liquidated
or subject to some other event resulting in the lack of any market for the
Common Stock (each, a "Transaction"), the holders of the CVRs would be entitled
to receive securities of the Surviving Person or such other consideration that
holders of shares of the Common Stock received in such a Transaction on the
basis described herein.  In the event of a Transaction in which the
consideration received by the stockholders of the Company were shares of
capital stock or other securities of the Surviving Person, the CVRs would
mature on the Maturity Date (or the Extended Maturity Date, if extended by the
Surviving Person), the Target Price would be adjusted by dividing the Target
Price by the Conversion Ratio (as defined below) and the holders of the CVRs
would receive on the Maturity Date (or if extended by the Surviving Person, the
Extended Maturity Date) a number of shares of the capital stock or other
securities of the Surviving Person equal to (a) the Adjusted Target Price (as
defined below) minus the Adjusted Current Market Value (as defined below)
divided by (b) the Adjusted Current Market Value; provided, however, in no
event shall the Surviving Person (a) be required to issue a number of shares of
its capital stock or other securities greater than 1.0 times the Conversion
Ratio at the Maturity Date or more than 1.5 times the Conversion Ratio at the
Extended Maturity Date and (b) issue shares of its capital stock or other
securities which are not publicly traded to the holders of the CVRs for any
CVRs held by them.  In the event that the shares of capital stock or other
securities of the Surviving Person to be issued in a Transaction are not
publicly traded, the consideration to be received by the holders of the CVRs
for any CVRs held by them shall be cash calculated in the manner described in
the following sentence.   In the
    





                                       18
<PAGE>   22
   
event of a Transaction in which the holders of the Company's Common Stock
received cash, the holders of the CVRs would receive cash in an amount equal to
the Adjusted Target Price minus the cash received by the stockholders of the
Company for one share of the Common Stock on the effective date of such a
Transaction; provided, however that the holders of the CVRs would not receive
greater than $5.00 per CVR in cash on or prior to the Maturity Date and $7.50
per CVR in cash from and after the Maturity Date to and including the Extended
Maturity Date.
    

         Certain Definitions.

   
         "Adjusted Current Market Value" per share means, with respect to the
Maturity Date or the Extended Maturity Date, the median of the averages of the
closing bid prices of the shares of capital stock or other securities of the
Surviving Person received by the holders of Common Stock in a Transaction on
the principal stock exchange on which such shares of capital stock or other
securities are traded during each 20 consecutive Trading Day period that both
begins and ends in the Valuation Period.
    

   
         "Adjusted Target Price" means the Target Price divided by the 
Conversion Ratio.
    

         "Authorized Newspaper" means The Wall Street Journal, or if The Wall
Street Journal shall cease to be published, or, if the publication or general
circulation of The Wall Street Journal shall be suspended for whatever reason,
such other English language newspaper as is selected by the Company with
general circulation in The City of New York, New York.

         "Conversion Ratio" means the number of shares of capital stock or
other securities of the Surviving Person received by the holder of one (1)
share of the Common Stock.

   
         "Current Market Value" means with respect to the Maturity Date and the
Extended Maturity Date, the median of the averages of the closing bid prices on
the NASDAQ Stock Market (or, if the Common Stock is listed on a securities
exchange, on such exchange) of shares of the Common Stock during each 20
consecutive trading day period that both begins and ends in the Valuation
Period.
    

         "Extended Maturity Date" means November 17, 1997.

         "Maturity Date" means November 17, 1996.

   
         "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization
or government or any agency or political subdivision thereof.
    

         "Per Share Market Value" means on any particular date (a) the closing
bid price per share of the Common Stock on such date on the principal stock
exchange on which





                                       19
<PAGE>   23
the Common Stock has been listed or, if there is no such price on such date,
then the average of such prices on such exchange on the date nearest preceding
such date, or (b) if the Common Stock is not listed on any stock exchange, the
average of the high and low sales prices for a share of Common Stock in the
over-the-counter market, as reported by the NASDAQ Stock Market for such date,
or, if there are no such prices on such date, then the average of such prices
on the date nearest preceding such date, or (c) if the Common Stock is not
quoted on the NASDAQ Stock Market, the average of the final bid and final asked
prices for a share of Common Stock in the over-the-counter market as reported
by the National Quotation Bureau Incorporated (or any similar organization or
agency succeeding to its functions of reporting prices), or (d) if the Common
Stock is no longer publicly traded, as determined by a nationally recognized or
major regional investment banking firm or firm of independent certified public
accountants of recognized standing (which may be the firm that regularly
examines the financial statements of the Company) selected in good faith by the
Board of Directors of the Company.

   
         "Surviving Person" means any other Person into which the Company shall
consolidate with or merge into or the Person which acquires by conveyance or
transfer or which leases, the properties and assets of the Company
substantially as an entirety.
    

         "Target Price" means (i) at the Maturity Date, $10.00 and (ii) at the
Extended Maturity Date, $12.50.  In each case, upon each occurrence of an event
specified under "Antidilution" above, such amounts, as they may have been
previously adjusted, shall be adjusted as described under "Antidilution" above.

         "Trading Day" means (a) a day on which the Common Stock is traded on
the principal stock exchange on which the Common Stock has been listed, or (b)
if the Common Stock is not listed on any stock exchange, a day on which the
Common Stock is traded in the over-the-counter market, as reported by the
NASDAQ Stock Market, or (c) if the Common Stock is not traded on the NASDAQ
Stock Market, a day on which the Common Stock is traded in the over-the-counter
market as reported by the National Quotation Bureau Incorporated (or any
similar organization or agency succeeding to its functions of reporting
prices).

         "Valuation Period" means the 60 Trading Day period immediately
preceding (and including) the Maturity Date or the Extended Maturity Date, as
the case may be.

Warrants

         The Company has warrants ("Warrants") outstanding to purchase an
aggregate of 437,500 shares of Common Stock.  Associated Energy Managers, Inc.
("AEM"), has Warrants to purchase 13,500 shares at an exercise price of $7.00
per share.  FUNB has Warrants to purchase 424,000 shares of Common Stock at an
exercise price of $9.79 per share.  These Warrants were issued to FUNB in
connection with the Company's credit agreement.  FUNB and AEM have certain
registration rights with





                                       20
<PAGE>   24
respect to shares of the Common Stock issued pursuant to the exercise of such
Warrants.  See "Description of Capital Stock -- Registration Rights."

         All outstanding Warrants contain provisions that protect AEM and FUNB
against dilution by adjusting the price at which the Warrants are exercisable
and the number of shares of the Common Stock issuable upon exercise thereof
upon the occurrence of certain events, including payment of stock dividends and
distributions, stock splits, recapitalizations, reclassifications, mergers,
consolidations or the issuance or sale of Common Stock or options, rights or
securities convertible into shares of the Common Stock, in the case of AEM, at
less than the current market price or, in the case of FUNB, at a price less
than the greater of the current market price or the exercise price.  A holder
of Warrants has no rights as a stockholder of the Company until the Warrants
are exercised.  All Warrants are currently exercisable, although none have been
exercised as of the date hereof.

Registration Rights

         The shares of the Common Stock to be received by AEM and FUNB upon
exercise of Warrants and any shares of the Common Stock owned by Endowment
Energy Partners, L.P. ("EEP") and Endowment Energy Partners II, Limited
Partnership ("EEP II") are entitled to certain rights with respect to the
registration of such shares under the Securities Act.

         Under the terms of the Registration Rights Agreement with EEP and EEP
II, in the event that the Company proposes to register any shares of the Common
Stock or securities convertible into Common Stock under the Securities Act for
its own account, except in certain circumstances, EEP and EEP II are entitled
to unlimited Piggyback Registrations, subject to the right of the underwriters
of any such offering to limit the number of shares included in such
registration.  The Company has agreed to pay all expenses in connection with a
Piggyback Registration except for underwriting discounts and selling
commissions which shall be borne by EEP and/or EEP II with respect to shares of
the Common Stock owned by EEP and EEP II other than the 211,500 shares of
Common Stock acquired by EEP and EEP II through the exercise of the Warrants
formerly owned by EEP and EEP II ("Warrant Shares").  EEP and EEP II have the
additional right to require the Company to effect one Demand Registration of
all shares of the Common Stock (other than Warrant Shares) in the aggregate at
any time and the Company is required to effect such registration, subject to
certain conditions and limitations.  The Company is required to bear the
expenses of a Demand Registration except for underwriting discounts and selling
commissions which shall be borne by EEP and/or EEP II with respect to shares of
Common Stock owned by EEP and EEP II other than Warrant Shares. The Company has
agreed to customary indemnities including an agreement to indemnify, subject to
certain limited exceptions, EEP and EEP II in connection with a Demand
Registration and a Piggyback Registration.





                                       21
<PAGE>   25
         Under the terms of its Warrants, AEM has the right to unlimited
Piggyback Registrations.  EEP and EEP II have the right to one Demand
Registration in the aggregate at any time after December 20, 1995 and unlimited
Piggyback Registrations with respect to Warrant Shares.  The Company has agreed
to pay all expenses in connection with Piggyback Registrations by AEM and by
EEP and EEP II with respect to Warrant Shares and to share expenses equally
with EEP and EEP II with respect to Warrant Shares registered in a Demand
Registration; provided, however, all underwriting discounts and selling
commissions shall be borne by EEP, EEP II or AEM, as the case may be.

         Under the terms of its Warrants, FUNB has the right to two Demand
Registrations and, subject to the rights to Piggyback Registration of EEP, EEP
II and AEM, unlimited Piggyback Registrations.  The Company will pay all
expenses incurred in connection with any such registration other than
underwriting discounts and selling commissions which shall be borne by  First
Union.  The Company has also agreed to customary indemnities, including an
agreement to indemnify, subject to certain limitations, First Union in
connection with a Demand Registration and a Piggyback Registration.

Anti-takeover Statutes

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

         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 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 five 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 in its bylaws.  The
Company's 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





                                       22
<PAGE>   26
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.  The Company's 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 (which for this purpose includes registered and
beneficial owners) and residents of Nevada, and which does business in Nevada
directly or through an affiliated company.  The status of the Company at the
time of the occurrence of a transaction governed by the Control Share Act
(assuming that the Company's 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 he or it 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 principal 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 vote on the issue of whether to grant to the Acquiring Person
voting rights in his control shares.  A special stockholders' meeting must then
be held at the Acquiring Person's expenses 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.

         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 (with respect to corporations with more than 100 stockholders of
record) a bylaw provision adopted by the affirmative vote of a majority of the
outstanding shares entitled to vote thereon authorizes the disinterested
directors alone to approve such voting rights.





                                       23
<PAGE>   27
         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 notice
advising them of the fact and of their right to receive "fair value" for their
shares.  The Company's Articles of Incorporation and Bylaws do not provide
otherwise.  Within 20 days of the mailing of the notice, 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."
Allowing the dissenting stockholders to receive "fair value" for all or part of
their shares is intended to avoid the "prisoner's dilemma" of forcing a
stockholder to sell to an Acquiring Person at an early date so as not to risk
diminution in value that may occur after the Acquiring Person gains the
controlling interest.

         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.  The Company's Articles of Incorporation and Bylaws
do not address this matter.

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

         Certain provisions of the Articles of Incorporation and the Bylaws of
the Company could have an anti-takeover effect.

         The 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, and could prevent any stockholder from obtaining
majority representation on the Company's 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 stockholders of the Company may be called only by the Chairman of the Board,
the





                                       24
<PAGE>   28
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 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 would prevent the holders of a majority
of the voting power of the Company from using the written consent procedure to
take stockholder action and taking action by consent without giving all the
stockholders of the Company entitled to vote on a proposed action the
opportunity to participate in determining such proposed action.

Stockholder Rights Plan

         On November 17, 1994, the Board of Directors of the Company adopted a
stockholder rights plan (the "Rights Plan").  Under the terms of the Rights
Plan, the Board of Directors of the Company declared a dividend of one common
share purchase right ("Right") on each share of the Common Stock outstanding on
November 17, 1994.  Each Right entitles the holder thereof to buy one-half of
one share of Common Stock at an exercise price of $40 per share ($20 per half
share), subject to adjustment.

         The Rights are not exercisable until the occurrence of specified
events.  Upon the occurrence of such an event (which events are generally those
which would signify the commencement of a hostile bid to acquire the Company),
the Rights then become exercisable (unless redeemed by the Board of Directors)
for a number of shares of Common Stock having a market value of four times the
exercise price of the Right.  If the acquiror were to conclude the acquisition
of the Company, the Rights would then become exercisable for shares of the
controlling/ surviving corporation having a value of four times the exercise
price of the Rights.  If the Rights were exercised at any time, significant
dilution would result, thus making the acquisition prohibitively expensive for
the acquiror.  In order to encourage a bidder to negotiate with the Board of
Directors, the Rights Plan provides that the Rights may be redeemed under
prescribed circumstances by the Board of Directors.

         The Rights are not intended to prevent a takeover of the Company and
will not interfere with any tender offer or business combination approved by
the Board of Directors.  The Rights Plan is intended to protect the
stockholders in the event of (a) an unsolicited offer to acquire the Company,
including offers that do not treat all stockholders equally, (b) the
acquisition in the open market of shares constituting control of the Company
without offering fair value to all stockholders, and (c) other





                                       25
<PAGE>   29
coercive takeover tactics which could impair the Board's ability to fully
represent the interests of the stockholders.

Limitation of Liability of Officers and Directors

         The Company's Articles of Incorporation contain a provision that
eliminates the personal monetary liability of directors and officers to the
Company and its stockholders for a breach of fiduciary duties to the extent
currently allowed under the Nevada General Corporation Law (the "Nevada
Statute").  If a director or officer were to breach his fiduciary duties,
neither the Company nor its stockholders could recover monetary damages, and
the only course of action available to the Company's stockholders would be
equitable remedies, such as an action to enjoin or rescind a transaction
involving a breach of fiduciary duty.  To the extent certain claims against
directors or officers are limited to equitable remedies, this provision of the
Company's 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 the stockholders and the Company 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.

Indemnification of Officers and Directors

         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 his duty.  The Bylaws of the Company provide
indemnification to the same extent allowed pursuant to the foregoing provisions
of the Nevada Statute.





                                       26
<PAGE>   30
         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.  The Company
does not currently have in effect a directors' and officers' liability
insurance policy.

         The Company has entered into indemnity agreements with each of its
directors and officers.  These agreements provide for indemnification to the
extent permitted by the Nevada Statute.

Transfer Agent

         The transfer agent for the Common Stock, the Series 1995-B Preferred
Stock and the CVRs is FUNB.

                        SHARES ELIGIBLE FOR FUTURE SALE

   
         At May 3, 1996, the Company had 5,804,812 shares of Common Stock
outstanding of which 427,335 shares were held by affiliates.  Of the shares
held by non-affiliates, 1,330,000 shares were sold in November 1995 in the
Private Placement.  In addition, at May 3, 1996, the Company had 353,810 shares
of Common Stock subject to outstanding options granted under certain stock
option plans (of which 68,600 shares were vested at May 3, 1996), 437,500
shares issuable upon exercise of warrants and up to 1,330,000 shares of Common
Stock issuable upon maturity of the CVRs in November 1996 or, if the Company
elects to extend the maturity date of the CVRs, up to 1,995,000 shares of
Common Stock in November 1997.  The actual number of shares issuable upon
maturity of the CVRs is dependent upon the difference between the Target Price
on the Maturity Date or the Extended Maturity Date, as the case may be and the
Current Market Value of the Common Stock.  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 Common Stock issuable upon
exercise of the stock options have been registered under the Securities Act.
In addition, the shares of Common Stock issuable upon maturity of the CVRs have
been registered under the Securities Act and the shares of the Common Stock
issuable upon exercise of the warrants are subject to certain registration
rights and, therefore, will be eligible for resale in the public market after a
registration statement covering such shares has been declared effective.  Sales
of shares of Common Stock under Rule 144 or pursuant to a registration
statement could have a material adverse effect on the price of the Common Stock
and could impair the Company's ability to raise additional capital through the
sale of its equity securities.
    

         In general, under Rule 144, any non-affiliate who has beneficially
owned restricted securities for at least three years may resell such restricted
securities in the public market without restriction under Rule 144.  Under Rule
144, any person who has beneficially owned restricted securities for at least
two years, and any affiliate of the Company who owns unrestricted securities,
is entitled to sell, within any three-month





                                       27
<PAGE>   31
period, a number of such securities that does not exceed the greater of 1% of
the then outstanding shares of the Company's Common Stock (approximately 58,048
shares) or the average weekly trading volume during the four calendar weeks
preceding the date on which notice of such sale was filed under Rule 144,
provided certain requirements concerning availability of public information,
manner of sale and notice of sale are satisfied.

   
         The Company has filed registration statements on Form S-8 under the
Securities Act to register shares of Common Stock reserved for issuance under
the Abraxas Petroleum Corporation 1984 Incentive Stock Option Plan, the Abraxas
Petroleum Corporation 1984 Non-Qualified Stock Option Plan, the Abraxas
Petroleum Corporation 1993 Key Contributor Stock Option Plan and the Abraxas
Petroleum Corporation 1994 Long Term Incentive Plan, thus permitting the resale
of shares issued under those plans by nonaffiliates in the public market
without restriction under the Securities Act.  As of May 3, 1996, options
granted under stock option plans to purchase 353,810 shares of Common Stock
were outstanding, of which 68,600 shares were vested.  See "Risk Factors -
Shares Eligible for Future Sale".
    

                                 LEGAL MATTERS

         The validity of the issuance of the Common Stock offered hereby will
be passed upon for the Company and the Selling Stockholders by Cox & Smith
Incorporated, San Antonio, Texas.

                                    EXPERTS

         The consolidated financial statements and financial statement
schedules of the Company included in the Company's Annual Report on Form 10-K
for the year ended December 31, 1995 have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon, included therein
and incorporated herein by reference.  Such consolidated financial statements
and financial statement schedules are incorporated herein by reference in
reliance upon such report given upon the authority of such firm as experts in
accounting and auditing.

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





                                       28
<PAGE>   32
         NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE
ANY INFORMATION OR TO MAKE ANY REPRESENTATION IN CONNECTION WITH THIS OFFERING
OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR ANY OF THE UNDERWRITERS.  THIS PROSPECTUS DOES NOT CONSTITUTE
AN OFFER TO SELL OR SOLICITATION OF ANY OFFER TO BUY BY ANYONE IN ANY
JURISDICTION IN WHICH SUCH OFFERS OR SOLICITATION IS NOT AUTHORIZED, OR IN
WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO OR
TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOT ANY SALE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF THE TIME SUBSEQUENT TO ITS DATE.





                                       29
<PAGE>   33
                               TABLE OF CONTENTS

   
<TABLE>
<CAPTION>
                                                                                              Page
                                                                                              ----
<S>                                                                                               <C>
Available Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2

Additional Information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2

Documents Incorporated by Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2

Risk Factors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3

The Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9

Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   10

Recent Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   10

Selling Stockholders  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   12

Plan of Distribution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   14

Description of Capital Stock  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   15

Shares Eligible for Future Sale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   27

Legal Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   28

Experts   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   28
</TABLE>
    
<PAGE>   34
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.         Other Expenses of Issuance and Distribution.

         The following table indicates the expenses to be incurred in
connection with the issuance and distribution of the securities described in
this registration statement, other than underwriting discounts and commissions.
The Company will pay all such expenses.


<TABLE>
         <S>                                                  <C>
         SEC registration fee                                 $ 8,170

         Blue sky fees and expenses                             3,000

         Accounting fees and expenses                           3,000

         Legal fees and expenses                               10,000

         Fees of Transfer Agent and Registrar                   2,000

         Printing and engraving fees and expenses               5,000

         Miscellaneous                                          5,000
                                                              -------
                  TOTAL                                       $36,170
                                                              =======
</TABLE>

Item 15.          Indemnification of Directors and Officers

         The Company's Articles of Incorporation contain a provision that
eliminates the personal monetary liability of directors and officers to the
Company and its stockholders for a breach of fiduciary duties to the extent
currently allowed under the Nevada General Corporation Law (the "Nevada
Statute").  If a director or officer were to breach his fiduciary duties,
neither the Company nor its stockholders could recover monetary damages, and
the only course of action available to the Company's stockholders would be
equitable remedies, such as an action to enjoin or rescind a transaction
involving a breach of fiduciary duty.  To the extent certain claims against
directors or officers are limited to equitable remedies, this provision of the
Company's 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 the stockholders and the Company would
have no effective remedy against the directors or officers.





                                      II-1
<PAGE>   35
         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.  The Bylaws of the Company 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.  The Company
does not currently have in effect a directors' and officers' liability
insurance policy.

         The Company has entered into indemnity agreements with each of its
directors and officers.  These agreements provide for indemnification to the
extent permitted by the Nevada Statute.

Item 16.          Exhibits and Financial Statement Schedules.

**3.1            Articles of Incorporation of Registrant.  (Filed as Exhibit
3.1 to Registrant's Form S-4 Registration Statement, Registration Statement No.
33-36565).

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

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

***3.4           Articles of Amendment to the Articles of Incorporation of
Registrant dated June 8, 1995.

***3.5           Amended and Restated Bylaws of the Registrant.





                                      II-2
<PAGE>   36
***3.6           Certificate of Designation of Series 1995-B Preferred Stock.

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

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

**4.3            Rights Agreement dated as of December 6, 1994 between the
Registrant and FUNB.  (Filed as Exhibit 4.1 to the Registrant's Registration
Statement on Form 8-A filed on December 6, 1994).

**4.4            Contingent Value Rights Agreement dated November 17, 1995 by
and between Registrant and FUNB (Filed as Exhibit 4.1 to Registrant's Current
Report on Form 8-K dated November 21, 1995).

   
*4.5             First Amendment to Contingent Value Rights Agreement dated May
2, 1996 by and between Registrant and FUNB.
    

***5.1           Opinion of Cox & Smith Incorporated.

**10.1           1984 Non-Qualified Stock Option Plan, as amended and restated.
(Filed as Exhibit 10.7 to the Registrant's Annual Report on Form 10-K filed
April 14, 1993).

**10.24          1984 Incentive Stock Option Plan, as amended and restated.
(Filed as Exhibit 10.8 to the Registrant's Annual Report on Form 10-K filed
April 14, 1993).

**10.3           Abraxas Petroleum Corporation 1993 Key Contributor Stock
Option Plan.  (Filed as Exhibit 10.9 to the Registrant's Annual Report on Form
10-K filed April 14, 1993).

**10.4           Conveyance of Overriding Royalty Interest dated as of April 1,
1993 by and between Abraxas Production Corporation and Morgan Guaranty Trust
Company of New York as trustee under Declaration of Trust dated November 10,
1992, as amended, for the Commingled Pension Trust Fund (Petroleum II).  (Filed
as Exhibit 10.5 to the Registrant's Current Report on Form 8-K on April 8,
1993).

**10.5           Ancillary Agreement dated as of April 1, 1993 by and between
Abraxas Production Corporation and Morgan Guaranty Trust Company of New York as
trustee under Declaration of Trust dated November 10, 1992, as amended, for the
Commingled Pension Trust Fund (Petroleum II).  (Filed as Exhibit 10.6 to the
Registrant's Current Report on Form 8-K filed on April 8, 1993).





                                      II-3
<PAGE>   37
**10.6           Abraxas Petroleum Corporation Restricted Share Plan for
Directors.  (Filed as Exhibit 10.20 to the Registrant's Annual Report on Form
10-K filed on April 12, 1994).

**10.7           Abraxas Petroleum Corporation 1994 Long Term Incentive Plan.
(Filed as Exhibit 10.21 to the Registrant's Annual Report on Form 10-K filed on
April 12, 1994).

**10.8           Abraxas Petroleum Corporation Incentive Performance Bonus
Plan.  (Filed as Exhibit 10.24 to the Registrant's Annual Report on Form 10-K
filed on April 12, 1994).

**10.9           Registration Rights and Stock Registration Agreement dated as
of August 11, 1993 by and among the Registrant, EEP and Endowment Energy
Partners II, Limited Partnership ("EEP II").  (Filed as Exhibit 10.33 to the
Registrant's Registration Statement on Form S-1, Registration No. 33-66446 (the
"S-1 Registration Statement")).

**10.10          First Amendment to Registration Rights and Stock Registration
Agreement dated June 30, 1994 by and among the Registrant, EEP and EEP II.
(Filed as Exhibit 10.3 to the Registrant's Current Report on Form 8-K filed on
July 14, 1994).

**10.11          Second Amendment to Registration Rights and Stock Registration
Agreement dated September 2, 1994 by and among the Registrant, EEP and EEP II.
(Filed as Exhibit 10.3 to the Registrant's Annual Report on Form 10-K filed
March 31, 1995)

**10.12          Third Amendment to Registration Rights and Stock Registration
Agreement dated November 17, 1995 by and among the Registrant, EEP and EEP II.
(Filed as Exhibit 10.17 to the Registrant's Annual Report on Form 10-K filed
March 31, 1995)

**10.13          Common Stock Purchase Warrant dated as of December 18, 1991
between the Registrant and EEP.  (Filed as Exhibit 12.3 to the Registrant's
Current Report on Form 8-K filed January 9, 1992).

**10.14          Common Stock Purchase Warrant dated as of August 1, 1993
between the Registrant and EEP.  (Filed as Exhibit 10.35 to the S-1
Registration Statement).

**10.15          Common Stock Purchase Warrant dated August 11, 1993 between
the Registrant and EEP II.  (Filed as Exhibit 10.36 to the S-1 Registration
Statement).

**10.16          Common Stock Purchase Warrant dated August 11, 1993 between
the Registrant and Associated Energy Managers, Inc. (Filed as Exhibit 10.37 to
the S-1 Registration Statement).





                                      II-4
<PAGE>   38
**10.17          Letter dated September 2, 1994 from the Registrant to EEP and
EEP II. (Filed as Exhibit 10.13 to the Registrant's Annual Report on Form 10-K
filed March 31, 1995)

***10.18         Amended and Restated Credit Agreement dated as of August 31,
1995 among Registrant, Abraxas Production Corporation ("Sub") and First Union
National Bank of North Carolina ("First Union").

**10.19          Warrant Agreement dated as of July 27, 1994 between the
Registrant and First Union.  (Filed as Exhibit 10.3 to the Registrant's Current
Report on Form 8-K filed August 5, 1994).

**10.20          Warrant Agreement dated as of December 16, 1994, between the
Registrant and FUNB.  (Filed as Exhibit 10.23 to the Registrant's Annual Report
on Form 10-K filed March 31, 1995).

***10.21         First Amendment to Warrant Agreement dated as of August 31,
1995 between the Registrant and FUNB.

**10.22          Form of Indemnity Agreement between the Registrant and each of
its directors and officers.  (Filed as Exhibit 10.30 to the S-1 Registration
Statement).

***10.23         Employment Agreement between the Registrant and Robert L. G.
Watson.

***10.24         Employment Agreement between the Registrant and Chris E.
Williford.

***10.25         Employment Agreement between the Registrant and Robert
Patterson.

***10.26         Employment Agreement between the Registrant and Stephen T.
Wendel.

**10.27          Common Stock and Contingent Value Rights Purchase Agreement
dated as of November 17, 1995 by and among Registrant and the Purchasers named
in Schedule l thereto.  (Filed as Exhibit 10.1 to Registrant's Current Report
on Form 8-K dated November 21, 1995.)

**10.28          Registration Agreement dated November 17, 1995 by and among
Registrant and the parties named in Schedule I thereto.  (Filed as Exhibit 10.2
to Registrant's Current Report on Form 8-K dated November 21, 1995.)

**10.29          Subscription Agreement between Registrant and Grey Wolf
Exploration, Ltd. (Filed as Exhibit 10.1 to Registrant's Current Report on Form
8-K dated January 17, 1995.)





                                      II-5
<PAGE>   39
**10.30          Subscription Agreement between Grey Wolf Exploration, Ltd. and
Cascade Oil and Gas Ltd. (Filed as Exhibit 10.2 to Registrant's Current Report
on Form 8-K dated January 17, 1995.)

**10.31          Portilla - 1996, L.P., Limited Partnership Agreement.  (Filed
as Exhibit 10.29 to the Registrant's Annual Report on Form 10-K filed March 29,
1996)

**10.32          Purchase and Sale Agreement dated as of March 20, 1996 by and
between Acco, LLC and the Registrant.  (Filed as Exhibit 10.30 to the
Registrant's Annual Report on Form 10-K filed March 29, 1996)

**10.33          Assignment and Bill of Sale dated as of March 20, 1996 by and
between Acco, LLC and Portilla - 1996, L.P.  (Filed as Exhibit 10.30 to the
Registrant's Annual Report on Form 10-K filed March 29, 1996)

**18.1           Letter regarding change in accounting principle.  (Filed as
Exhibit 18.1 to the Registrant's Annual Report on Form 10-K filed on April 12,
1994).

**22.1           Subsidiaries of Registrant.  (Filed as Exhibit 22.1 to the
Registrant's Annual Report on Form 10-K filed March 31, 1995).

*23.1            Consent of Ernst & Young LLP.

***23.2          Consent of DeGolyer and MacNaughton.

***23.3          Consent of Cox & Smith Incorporated (included in Exhibit 5.1).

***24.1          Powers of Attorney appear on Page II - 9 of Registration
Statement filed on January 18, 1996.

***24.2          Power of Attorney of Robert D. Gershen.

***24.3          Power of Attorney of Richard M. Riggs.

__________________________
*     Filed herewith.
**    Incorporated by reference to the filing indicated.
***   Previously filed.





                                      II-6
<PAGE>   40
Item 17.          Undertakings

         A.       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: 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.

         B.      The undersigned registrant hereby undertakes 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 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.

         C.      Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
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 proceedings) 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.





                                      II-7
<PAGE>   41
                                   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, and State of Texas, on the 7th day
of May, 1996.
    



                                        ABRAXAS PETROLEUM CORPORATION



                                        By: /s/ Chris E. Williford             
                                            -----------------------------------
                                            Chris E. Williford,
                                            Executive Vice President, Treasurer
                                            and Chief Financial Officer





                                      II-8
<PAGE>   42
                               POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below
constitutes and appoints Robert L. G.  Watson and Chris E. Williford, and each
of them, as his true and lawful attorneys-in-fact and agents, with full power
of substitution and resubstitution, for him and in his name, place and stead,
in any and all capacities, to sign any or all amendments (including
post-effective amendments) to this Registration Statement, and to file the
same, with all exhibits thereto, and other documents in connection therewith,
with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the foregoing, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or their substitutes, may lawfully do or cause to
be done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated.

   
<TABLE>
<CAPTION>
         Signature                                 Name and Title                             Date
         ---------                                 --------------                             ----
<S>                                        <C>                                                <C>
*/s/ Robert L. G. Watson                   Chairman of the Board,                             _____, 1996
- --------------------------                 President, Chief Executive Officer                            
Robert L.G. Watson                         (Principal Executive Officer) and Director
                                                                                     
/s/ Chris E. Williford                     Executive Vice President,                          May 7, 1996
- ----------------------------------         Treasurer, Chief Financial                                    
Chris E. Williford                         Officer and Director (Principal  
                                           Financial and Accounting Officer)

*/s/ Franklin Burke                        Director                                           _____, 1996
- ----------------------------------                                                                               
Franklin Burke

*/s/ Richard M. Kleberg, III               Director                                           _____, 1996
- ----------------------------------                                                                               
Richard M. Kleberg, III

*/s/ Willard A. Marks                      Director                                           _____, 1996
- ----------------------------------                                                                               
Willard A. Marks

*/s/ James C. Phelps                       Director                                           _____, 1996
- ----------------------------------                                                                               
James C. Phelps

*/s/ Paul A. Powell, Jr.                   Director                                           _____, 1996
- ----------------------------------                                                                               
Paul A. Powell, Jr.

*/s/ Richard M. Riggs                      Director                                           _____, 1996
- ----------------------------------                                                                               
Richard M. Riggs

*/s/ Robert D. Gershen                     Director                                           _____, 1996
- ----------------------------------                                                                               
Robert D. Gershen

*By:     /s/ Chris E. Williford                                                               May 7, 1996
    ------------------------------                                                                       
     Chris E. Williford
     Attorney-in-Fact
</TABLE>
    





                                      II-9
<PAGE>   43
                                 EXHIBIT INDEX

   
<TABLE>
<CAPTION>
Exhibit Number:           Exhibit                                            Page Number:
- --------------            -------                                            ----------- 
<S>                       <C>                                                        <C>
4.5                       First Amendment to Contingent Value                        ____
                          Rights Agreement dated May 2, 1996
                          by and between Registrant and FUNB

23.1                      Consent of Ernst & Young LLP                               ___
</TABLE>
    

<PAGE>   1
                                                                     EXHIBIT 4.5


                                FIRST AMENDMENT
                                       TO
                       CONTINGENT VALUE RIGHTS AGREEMENT

         This First Amendment to Contingent Value Rights Agreement ("First
Amendment") dated as of May 2, 1996 by and between Abraxas Petroleum
Corporation, a Nevada corporation (the "Company"), and First Union National
Bank of North Carolina (the "Rights Agent").

                              W I T N E S S E T H:

         WHEREAS, the Company and the Rights Agent have previously executed and
delivered that certain Contingent Value Rights Agreement dated as of November
17, 1995 (the "Original Agreement" and, together with this First Amendment, the
"Agreement");

         WHEREAS, the Company's Board of Directors has approved this First
Amendment;

         NOW, THEREFORE, in consideration of the mutual covenants and
agreements herein contained, the Company and the Rights Agent agree as follows:

         1.      Unless otherwise defined in this First Amendment, all
capitalized terms used herein shall have the meaning set forth in the Original
Agreement.

         2.      Section 1.05(b) of the Original Agreement is hereby amended to
read, in its entirety, as follows:

         "(b)    the Company by the Rights Agent or by any Holder shall be
         sufficient for every purpose hereunder if in writing and mailed,
         first-class postage prepaid, to the Company addressed to it at 500
         North Loop 1604 East, Suite 100, San Antonio, Texas 78232 Attention:
         Chief Financial Officer, or at any other address previously furnished
         in writing to the Rights Agent by the Company."

         3.      Section 8.01(c) is hereby added to the Original Agreement and
reads, in its entirety, as follows:

         "(c)    In the event that the Company shall consolidate with or merge
         into any other Person or convey, transfer or lease its properties and
         assets substantially as an entirety to any Person or is liquidated
         (each, a "Transaction"), the Holders of the CVRs shall be entitled to
         receive shares of the capital stock or securities
<PAGE>   2
         of the Surviving Person or such other consideration that holders of
         shares of the Common Stock received in such a Transaction as follows:

                 (1)      in the event of a Transaction in which the
                          consideration received by the holders of the Common
                          Stock is shares of the capital stock or other
                          securities of the Surviving Person, the Surviving
                          Person shall issue to each Holder of a CVR
                          Certificate at the Maturity Date, unless the
                          Surviving Person shall, in its sole discretion,
                          extend the Maturity Date to the Extended Maturity
                          Date, then at the Extended Maturity Date, for each
                          CVR held by such Holder, upon presentment by such
                          Holder of such Holder's CVR Certificate, the number
                          of shares of capital stock or other securities of the
                          Surviving Person equal to a fraction, the numerator
                          of which is the Adjusted Target Price (as defined
                          below) minus the Adjusted Current Market Value (as
                          defined below) per share and the denominator of which
                          is the Adjusted Current Market Value per share;
                          provided, however, in no event shall the Surviving
                          Person (a) be required to issue a number of shares of
                          its capital stock or other securities greater than
                          (i) 1.0 times the Conversion Ratio (as defined below)
                          on the Maturity Date or (ii) 1.5 times the Conversion
                          Ratio on the Extended Maturity Date and (b) issue
                          shares of its capital stock or other securities which
                          are not publicly traded to the Holders for any CVRs
                          held by them.  In the event that the shares of
                          capital stock or other securities of the Surviving
                          Person to be issued in a Transaction are not publicly
                          traded, the consideration to be received by the
                          Holders for any CVRs held by them in a Transaction
                          shall be cash in accordance with the terms of Section
                          8.01(c)(2) hereof.  All determinations by the
                          Surviving Person in connection with this Section
                          8.01(c), absent manifest error, shall be final and
                          binding on the Surviving Person and the Holders;

                 (2)      in the event of a Transaction in which the holders of
                          Common Stock receive cash, the Surviving Person shall
                          pay to each Holder of a CVR Certificate, on the
                          effective date of such a Transaction, for each CVR
                          held by such Holder, upon presentment by such Holder
                          of such Holder's CVR Certificate, an amount of cash
                          equal to the Target Price minus the amount of cash
                          received by the stockholders of the Company for one
                          share of the Common Stock; provided, however, (i) in
                          no event shall any Holder receive greater than $5.00
                          per CVR on or prior to the Maturity Date and $7.50
                          per CVR from and after the Maturity Date to and
                          including the Extended Maturity Date and (ii) that in
                          the event that the amount of cash per share received
                          by the holders of the Common Stock is greater than
                          the Target Price, the Holders shall not receive any
                          cash for any CVRs held by them.





                                       2
<PAGE>   3
                 (3)      As used in this Section 8.01(c), the following
                          capitalized terms shall have the following meanings:

                          (i)     "Adjusted Current Market Value" per share
                          means, with respect to the Maturity Date or the
                          Extended Maturity Date, the median of the averages of
                          the closing bid prices of the shares of capital stock
                          or other securities of the Surviving Person received
                          by the holders of Common Stock in a Transaction on
                          the principal stock exchange on which such shares of
                          capital stock or other securities are traded during
                          each 20 consecutive Trading Day period that both
                          begins and ends in the Valuation Period;

                          (ii)    "Adjusted Target Price" means the Target 
                          Price divided by the Conversion Ratio; and

                          (iii)   "Conversion Ratio" means the number of shares
                          of capital stock or other securities of the Surviving
                          Person received by the Holder of one (1) share of the
                          Common Stock."

         3.      Except as expressly amended hereby, the Original Agreement
remains in full force and effect.  Any references to the Original Agreement in
the CVR Certificates shall refer to the Agreement as amended hereby.





                                       3
<PAGE>   4
         IN WITNESS WHEREOF, the parties have executed this Amendment as of the
date first written above.


                                           ABRAXAS PETROLEUM CORPORATION



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


ATTEST:

                                              
- --------------------------------
Stephen T. Wendel, Secretary



                                           FIRST UNION NATIONAL BANK OF
                                           NORTH CAROLINA



                                           By:                                 
                                               --------------------------------
                                           Title:                              
                                                 ------------------------------





                                       4

<PAGE>   1
                                                                    EXHIBIT 23.1


                        CONSENT OF INDEPENDENT AUDITORS


We consent to the reference to our firm under the caption "Experts" in
Amendment No. 3 to the Registration Statement (Form S-3) and related Prospectus
of Abraxas Petroleum Corporation for the registration of 3,325,000 shares of
its common stock and to the incorporation by reference therein of our report
dated March 19, 1996, with respect to the consolidated financial statements and
schedules of Abraxas Petroleum Corporation included in its Annual Report (Form
10- K) for the year ended December 31, 1995, filed with the Securities and
Exchange Commission.



                                                   /s/ ERNST & YOUNG LLP
                                                   -----------------------------
                                                   ERNST & YOUNG LLP

San Antonio, Texas
May 7, 1996



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