PRIMEENERGY CORP
8-K, 1996-05-30
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT
                      PURSUANT TO SECTION 13 OR 15 (d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934

                                  MAY 15, 1996
                                  ------------
                Date of Report (Date of earliest event reported)

                            PRIMEENERGY CORPORATION
                            -----------------------
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                                    --------
                 (State or other jurisdiction of incorporation)

       0-7406                                                84-0637348
       ------                                                ----------
(Commission File Number)                            (IRS Employer Identification
                                                               Number)

                ONE LANDMARK SQUARE, STAMFORD, CONNECTICUT 06901
                ------------------------------------------------
                    (Address of principal executive offices)

                                 (203) 358-5700
                                 --------------
                        (Registrant's telephone number)
<PAGE>   2
ITEM 2. ACQUISITION OR DISPOSITION OF ASSETS.

         On May 15, 1996, PrimeEnergy Corporation ("PrimeEnergy" or the
"Registrant") completed the acquisition of certain oil and gas properties and
other assets previously held by Saratoga Resources, Inc., a Delaware
corporation ("Saratoga") and its subsidiaries. The acquisition was made from
the lender of Saratoga, Internationale Nederlander (U.S.) Capital Corporation,
a Delaware corporation ("ING") following foreclosure of such properties by ING
and with the consent of Saratoga. Such acquisition was made pursuant to that
certain Purchase and Sale Agreement dated as of May 7, 1996, by and between ING
and PrimeEnergy (the "Purchase Agreement"), a copy of which is filed herewith
as Exhibit 10.19.  In furtherance thereof, subsidiaries of Saratoga, Saratoga
Resources, Inc., a Texas corporation, Lobo Energy, Inc., a Texas corporation
and Lobo Operating, Inc., a Texas corporation, delivered to PrimeEnergy that
certain Assignment, Conveyance and Bill of Sale (the "Saratoga Assignment"), a
copy of which is filed herewith as Exhibit 10.20. The aggregate consideration
paid by PrimeEnergy for the purchased assets was the cash sum of $7,180,000,
subject to adjustments made in connection with the allocation of revenues and
expenses among the parties as a result the deemed effective date for production
of oil and gas as of January 1, 1996. The purchased assets include various
producing oil and gas interests in about 145 producing oil and gas wells
located primarily along the Texas Gulf Coast, certain receivables, bank
accounts, and related operating assets and properties. Such oil and gas
interests are described in the Purchase Agreement. About 132 of such oil and
gas wells were operated by Saratoga and it is anticipated that PrimeEnergy will
succeed as operator of those properties.

         The consideration and terms for the acquisition of the purchased
interests were reached by arms's length negotiations between PrimeEnergy,
Saratoga and ING, and based upon an evaluation of the properties, operational
costs, analyses of future oil and gas production, development obligations with
respect to the properties and similar relevant factors. There was, and is, no
material relationship between Saratoga and/or ING and PrimeEnergy or any
affiliate of PrimeEnergy, or any Director or officer of PrimeEnergy or any
associate of any such Director or officer.

         The funds used by PrimeEnergy in this acquisition were provided by the
existing Credit Agreement between PrimeEnergy and Bank One, Texas, National
Association and Den norske Bank AS.
<PAGE>   3
ITEM 6. FINANCIAL STATEMENTS AND EXHIBITS.

         (a)     Financial statements of businesses acquired: 
                 None

         (b)     Pro forma financial information:

                 The required pro forma financial information will be filed by
amendment to this Form 8-K under cover of Form 8, on or before July 29, 1996.

         (c)     Exhibits.

<TABLE>
<CAPTION>
         Exhibit No.                           Exhibit  
         ----------                            -------  
         <S>              <C>
           10.19          Purchase and Sale Agreement dated as of May 7, 1996, 
                          by and between Internationale Nederlander (U.S.) 
                          Capital Corporation and PrimeEnergy Corporation
                
           10.20          Assignment, Conveyance and Bill of Sale dated as of 
                          May 7, 1996, by Saratoga Resources, Inc., a Texas 
                          corporation, et al, to PrimeEnergy Corporation
</TABLE>

                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                                   PrimeEnergy Corporation
                                                                            
Date: May 29, 1996                                                             
                                                   By: /s/ Beverly A. Cummings
                                                       -------------------------
                                                       Beverly A. Cummings
                                                       Executive Vice President


                                      -2-
<PAGE>   4
                               Index to Exhibits

<TABLE>
<CAPTION>
Exhibit No.                               Exhibit
- ----------                                -------
  <S>            <C>
  10.19          Purchase and Sale Agreement dated as of May 7, 1996, by and 
                 between Internationale Nederlander (U.S.) Capital Corporation 
                 and PrimeEnergy Corporation

  10.20          Assignment, Conveyance and Bill of Sale dated as of May 7, 
                 1996, by Saratoga Resources, Inc., a Texas corporation, 
                 et al., to PrimeEnergy Corporation
</TABLE>

<PAGE>   1
                                                                   EXHIBIT 10.19


                          PURCHASE AND SALE AGREEMENT


         This Purchase and Sale Agreement (hereinafter called "this Agreement")
is made and entered into this 7th day of May, 1996, between INTERNATIONALE
NEDERLANDEN (U.S.) CAPITAL CORPORATION, a Delaware corporation (hereinafter
called "Seller"), and PRIMEENERGY CORPORATION, a Delaware corporation
(hereinafter called "Buyer"), with reference to the following circumstances:

         Certain properties (the "Foreclosure Properties") are currently
subject to a Notice of Substitute Trustee's Sale (the "Sale"), a copy of which
is attached hereto.

         Seller has entered into a Compromise and Settlement Agreement (the
"Settlement Agreement") with Saratoga Resources, Inc., a Texas corporation
("Saratoga Texas"), Saratoga Resources, Inc., a Delaware corporation ("Saratoga
Delaware"), LOBO Energy, Inc., a Texas Corporation ("LEI") and LOBO Operating,
Inc., a Texas corporation ("LOI") (the "Saratoga Companies") pursuant to which
the Saratoga Companies have agreed to not enjoin, restrain or otherwise prevent
the sale and, in the event that the Seller acquires the property at the sale,
to deliver to Seller, or to Buyer as Seller's transferee various documents
confirming the transfer, or transferring, properties and assets as more
particularly described in Exhibit A thereto, which include, but are not limited
to, the Foreclosure Properties, (the Foreclosure Properties and such other
assets, interests, and properties to be conveyed pursuant to the Settlement
Agreement herein collectively called the "Interests").

         In the event that Seller acquires the Foreclosure Properties, Seller
desires to sell and Buyer desires to purchase, all of Seller's right, title,
estate and interest in and to Interests, including the Foreclosure Properties,
subject to the satisfaction of the conditions precedent set forth in this
Agreement.

         In consideration of the foregoing premises, the following terms,
agreements, covenants, and conditions, and for the purpose of prescribing the
terms and conditions of the purchase and sale of the Interests, Seller and
Buyer agree as follows:

         Section 1.       Sale of Interests; Purchase Price; Agreed Value.  At
the closing provided for at Section 2 of this Agreement (hereinafter called the
"Closing"), Seller, subject to the terms and conditions of this Agreement, will
sell, convey, and deliver the Foreclosure Properties and the other Interests to
Buyer, and Buyer will purchase and accept delivery of the Foreclosure
Properties and the other Interests from Seller, for Seven Million One Hundred
Eighty Thousand Dollars ($7,180,000) (hereinafter called the "Base Price"),
subject to the adjustments made in connection with the allocation of revenues
and expenses among Seller and Buyer as a result of the deemed "Effective Date"
considerations all as more particularly described  at Section 2 of this
<PAGE>   2
Agreement, and in further consideration of Buyer's execution and delivery at
the Closing (or promptly thereafter) of that certain Conveyance of Production
Payment and Net Profit Overriding Royalty Interest (hereinafter called the
"Conveyance") from Buyer, as grantor, to Seller (hereinafter called the
"Purchase Price").

         Section 2.       Closing; Effective Date Allocation.  The purchase and
sale of the Interests shall be held and consummated promptly following the
acquisition of the Foreclosure Properties, and contemporaneously with the
delivery of documents under the Settlement Agreement (hereinafter called the
"Closing Date").  In the event that Seller does not acquire the Foreclosure
Properties at the sale and the other Interests pursuant to the Settlement
Agreement, this Agreement will terminate.  The purchase and sale of the
Interests shall be effective for purposes of adjustment to the purchase price
as of January 1, 1996 (the "Effective Date").  The computation of the
adjustments shall be made as if Seller had owned the Interests on the Effective
Date even though the Interests are acquired by Seller on the Closing Date.  All
revenues, proceeds, receipts, and income ("Revenues") attributable to
production from the Wells and the sale of the Properties prior to the Effective
Date shall belong to Seller.  Conversely, all Revenues attributable to
production from the Wells, the sale of the Properties or otherwise attributable
to the Interests on or after the Effective Date, including, without limitation,
all production of oil, gas, and other hydrocarbons attributable to the
Interests which was in tanks, storage containers, or other facilities
("Production") on or after the Effective Date awaiting delivery to the
purchaser of same, shall belong to Buyer.  All joint interest billings related
to the use or operation of the Interests prior to the Effective Date
("Expenses") shall be the sole obligation of Seller.  Conversely, all joint
interest billings related to the use or operation of the Interests on or after
the Effective Date shall be the sole obligation of Buyer; provided, however,
that Seller shall be solely responsible for each Expense incurred on or after
the Effective Date which is payable to any person or entity (other than an
unrelated third party or parties for services performed or materials furnished
with respect to the use, ownership or operation of the Interests from and after
the Effective Date, but prior to the Closing Date) if Seller has not delivered
an itemized documentation of such Expense to Buyer before the Closing Date.
Any party hereto that owes a sum of money to the other party hereto pursuant to
the terms of this Agreement shall promptly pay to the other party such sum.  In
no event will the aggregate adjustment to the Base Price for the amount payable
by Seller under this Section 2 exceed $372,000, such adjustment will be
calculated in accordance with Exhibit B.

         Section 3.       Indemnity.  PrimeEnergy hereby agrees to indemnify,
defend and hold harmless, ING from and against any loss, expense, liability,
claims, damage, penalties, fines, actions judgments, settlements or
disbursements arising out of or based upon ING's ownership of any of the
Interests.

         Section 4.       Representations and Warranties of Seller.  Seller
represents and warrants to Buyer as of the date hereof, and Seller will
represent and warrant to Buyer as of the Closing Date, as follows:




                                     -2-
<PAGE>   3
                 (a)      Organization; Qualification; Authorization. Seller is
and until the date of Closing shall continue to be a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware.  This Agreement constitutes the valid and binding agreement of Seller
enforceable against Seller in accordance with its terms.  All requisite
corporate action necessary to close the transactions contemplated by this
Agreement has been taken by Seller, and Seller has obtained all requisite
consents and authorizations necessary to close such transactions.

         Section 5.       Representations and Warranties of Buyer.  Buyer
represents and warrants to Seller as of the date hereof, and Buyer will
represent and warrant to Seller on the Closing Date, as follows:

                 (a)      Organization; Qualification; Agreement Authorized and
Valid.  Buyer is and until the Closing Date shall continue to be a corporation
validly existing and in good standing under the laws of the state of its
incorporation.  This Agreement has been duly authorized, executed and delivered
by Buyer, and all instruments required hereunder to be delivered by Buyer at
the Closing shall be duly authorized, executed and delivered by Buyer.  All
requisite corporate action by Buyer necessary to close the transactions
contemplated by this Agreement has been taken.  This Agreement constitutes the
valid and binding agreement of Buyer enforceable against Buyer in accordance
with its terms.

                 (b)      Brokers and Finders.  Buyer has incurred no
liability, contingent or otherwise, for broker's or finder's fees with respect
to this transaction for which Seller shall have any responsibility whatsoever.

         Section 6.       Independent Investigation.  Buyer acknowledges that
in entering into this Agreement and consummating the transactions contemplated
hereby that it has conducted or it will conduct an independent investigation
and evaluation of the Interests, and that Buyer's decision to consummate the
purchase of the Interests are based solely upon Buyer's independent
investigation and evaluation of the Interests.

         Section 7.       Further Assurances.  Upon delivery of the Purchase
Price by Buyer to Seller and subject to the terms of this Agreement, Seller
shall convey all of Seller's right, title and interest including lien rights,
if any, in the Foreclosure Property to Buyer at the Closing by delivering to
Buyer a fully and properly executed and acknowledged Conveyance in the form
attached hereto as Exhibit C.  In addition and from time to time (whether at or
after Closing), as and when reasonably requested by Buyer or its successors or
assigns, Seller will execute, acknowledge and deliver all such additional
deeds, releases, assignments, division orders, transfer orders, letters in lieu
of transfer orders, bills of sale, instruments, files, records, documents and
books in Seller's possession or under Seller's control, and take such other
action as Buyer may reasonably deem necessary or desirable in order to more
effectively convey and transfer to Buyer the Interests, and Seller will assist
Buyer in the collection or reduction to possession of the Interests.





                                      -3-
<PAGE>   4
         Section 8.       Conditions to Obligations of Buyer.  The obligation
of Buyer to consummate the transactions provided for in this Agreement for
Buyer's consummation shall be subject to the satisfaction of each of the
following conditions as of the Closing Date, subject to the right of Buyer to
waive any one or more of such conditions:

                 (a)      Opinion of Counsel.  Counsel of the Saratoga
Companies shall have furnished Seller and Buyer such counsel's written opinion
(in form and substance satisfactory to Seller and Buyer) in the form attached
to the Settlement Agreement.

                 (b)      Performance of This Agreement.  Seller shall have had
its bid accepted as the highest bid pursuant to the Sale and receive a duly
executed and acknowledged Substitute Trustee Deed covering the Foreclosure
Properties.

                 (c)      No Litigation.  No suit, action, proceeding,
investigation, injunction, inquiry or request for information by any
governmental body or authority, or private party shall have been instituted or
threatened which questions or reasonably appears to portend subsequent
questioning of the validity or legality of this Agreement or the transactions
contemplated by this Agreement.

                 (d)      Settlement Agreement.  The Saratoga Parties and ING
shall have entered into the Settlement Agreement and the Saratoga Parties shall
have delivered to Buyer the Sale Documents contemplated thereby.

                 (e)      ING Release.  Seller shall have secured and deliver
to Buyer at the Closing a properly executed and acknowledged assignment in
recordable form of the liens, security interests, and assignments of production
upon the Interests arising from Sellers' mortgages, deeds of trust and other
lien instruments with ING, with respect to any interest not discharged by the
Sale, which shall be in a form satisfactory to Buyer.

                 (f)      Seller/ING Mutual Release.  Seller, ING and Buyer
shall have delivered one to the other at the Closing a properly executed mutual
release of claims in a form satisfactory to Buyer.

                 (g)      Operations.  Buyer, in its good faith judgment, shall
have received the requisite number of agreements and approvals, in form and
substance satisfactory to Buyer, from non-operating working interest
participants in the Saratoga Operated Wells to ensure that Buyer will succeed
Saratoga as the duly designated and appointed operator of the Saratoga Operated
Wells from and after the Closing.

                 (h)      Other Agreements.  Buyer shall have received (i) a
properly executed resignation and assignment, in form and substance
satisfactory to Buyer, from LOI resigning as operator of the LOI Operated Wells
and transferring all interest in such operations to Buyer, (ii) a properly
executed Shareholders' Agreement, in form and substance satisfactory to Buyer,
from





                                      -4-
<PAGE>   5
Thomas F. Cooke, Joseph T. Kaminski and Randall F. Dryer to Buyer, and (iii) a
properly executed acknowledgment, representation and warranty from Saratoga
Delaware that it has no right, title, interest or claim in and to any asset or
property included within the Interests, whether or not such asset or property
is set forth at Exhibit A attached hereto.

         Section 9.       Conditions to Obligations of Seller.  The obligations
of Seller to consummate the transactions provided for in this Agreement for
Seller's consummation shall be subject to the satisfaction of each of the
following conditions as of the Closing Date, subject to the right of Seller to
waive any one or more of such conditions:

                 (a)      Representations and Warranties of Buyer.  The
representations and warranties of Buyer contained in this Agreement shall be
true and correct in all material respects.

                 (b)      Performance of This Agreement.  Buyer shall have duly
performed or complied with all material obligations to be performed or complied
with by Buyer under the terms of this Agreement on or prior to the Closing
Date.

                 (c)      No Litigation.  No suit or action, investigation,
inquiry or request for information by any government body or authority, or
private party shall have been instituted or threatened which questions or
reasonably appears to portend subsequent questioning of the validity or
legality of this Agreement or the transactions contemplated by this Agreement.

         Section 10.      Termination.  Anything in this Agreement to the
contrary notwithstanding, this Agreement may be terminated by either of the
parties on the Closing Date if any of the conditions precedent to such party's
obligations at Closing have not been satisfied or waived on or prior to the
Closing Date.  Such termination shall be without waiver of and shall not be
construed to limit the legal or equitable remedies of the terminating party.

         Section 11.      Expenses; Sales Taxes.  Except as otherwise provided
in this Agreement, each party hereto will bear and pay its own expenses of
negotiating and consummating the transactions contemplated by this Agreement.
Buyer shall be responsible for remitting to the applicable governmental taxing
authority all sales taxes resulting from the sale contemplated by this
Agreement.  Such taxes shall be Buyer's sole responsibility.  Seller and Buyer
shall cooperate with one another with respect to the timely filing of a sales
tax return or other filings, if required by applicable law, with all applicable
governmental authorities.

         Section 12.      DTPA WAIVER.  AS RESPECTS ANY AND ALL INTERESTS
SITUATED IN THE STATE OF TEXAS, BUYER HEREBY WAIVES THE PROVISIONS OF THE TEXAS
DECEPTIVE TRADE PRACTICES-CONSUMER PROTECTION ACT, CHAPTER 17, SUBCHAPTER E,
SECTIONS 17.41-17.63 INCLUSIVE, TEXAS BUSINESS AND COMMERCE CODE, EXCEPT
SECTION 17.555, WHICH IS NOT WAIVED.  IN ORDER TO EVIDENCE ITS ABILITY TO GRANT
SUCH WAIVER AND TO ESTABLISH BUYER'S SOPHISTICATION AS A PURCHASER OF OIL AND
GAS





                                      -5-
<PAGE>   6
PROPERTIES, BUYER HEREBY REPRESENTS AND WARRANTS TO SELLER THAT BUYER (A) IS IN
THE BUSINESS OF SEEKING OR ACQUIRING, BY PURCHASE OR LEASE, MINERALS, GOODS OR
SERVICES FOR COMMERCIAL OR BUSINESS USE, (B) HAS ASSETS OF $1,000,000 OR MORE
ACCORDING TO BUYER'S MOST RECENT FINANCIAL STATEMENT PREPARED IN ACCORDANCE
WITH GENERALLY ACCEPTED ACCOUNTING PRINCIPLES, (C) HAS KNOWLEDGE AND EXPERIENCE
IN FINANCIAL AND BUSINESS MATTERS THAT ENABLE IT TO EVALUATE THE MERITS AND
RISKS OF THE TRANSACTIONS CONTEMPLATED HEREBY, (D) IS NOT IN A SIGNIFICANTLY
DISPARATE BARGAINING POSITION, (E) IS AN EXPERIENCED AND KNOWLEDGEABLE INVESTOR
IN THE OIL AND GAS BUSINESS AND IS CAPABLE OF INDEPENDENTLY EVALUATING THE
MERITS AND RISKS OF THE INVESTMENT CONTEMPLATED BY THE AGREEMENT, (F) HAS
ENGAGED OR EMPLOYED THE SERVICES OF INDEPENDENT COUNSEL AND PROFESSIONALS TO
ADVISE IT AS IT DEEMS NECESSARY IN CONNECTION WITH THIS AGREEMENT, (G) HAS MADE
ITS OWN ASSUMPTIONS REGARDING THE RECOVERABILITY, QUANTITY, VALUE AND PRICES OF
THE OIL AND GAS RESERVES INCLUDED IN THE INTERESTS, (H) IS PURCHASING THE
INTERESTS IN THE ORDINARY COURSE OF ITS BUSINESS FOR INVESTMENT PURPOSES AND
NOT FOR PURPOSES OF FURTHER RESALE, DISTRIBUTION OR TRANSFER IN VIOLATION OF
THE SECURITIES ACT OF 1933 OR THE RULES AND REGULATIONS THEREUNDER OR [ANY
OTHER APPLICABLE SECURITIES LAWS OF THE UNITED STATES OR ANY APPLICABLE STATE
BLUE SKY LAWS AND (I) HAS THE FUNDS AND FINANCIAL CAPABILITY TO DELIVER TO
SELLER THE PURCHASE PRICE AT THE CLOSING.

         Section 13.      Notices.  All communications required or permitted
under this Agreement shall be in writing and any communication or delivery
hereunder shall be deemed to have been duly made if actually delivered, or if
mailed by registered or certified mail, postage prepaid, addressed as set forth
below, shall be deemed to have been duly made on the date received.  Either
party may, by written notice so delivered to the other, change the address to
which delivery shall thereafter be made.





                                      -6-
<PAGE>   7
                 (a)      Notices to Seller:

                          Internationale Nederlanden (U.S.)
                                  Capital Corporation
                          135 East 57th Street
                          New York, New York 10022-1500

                          Attn:  Peter Y. Clinton

                 (b)      Notices to Buyer:

                          PrimeEnergy Corporation
                          1 Landmark Square, 11th Floor
                          Stamford, Connecticut  06901

                          Attn:  Charles E. Drimal, Jr., President

         Section 14.      Binding Effect.  This Agreement shall be binding upon
and inure to the benefit of the parties hereto and their respective successors
and assigns.  Buyer may not assign all or any portion of its rights or
obligations under this Agreement without Seller's prior written consent
thereto.

         Section 15.      Counterparts.  This Agreement may be executed in any
number of counterparts, which taken together shall constitute one and the same
instrument and each of which shall be considered an original for all purposes.

         Section 16.      Expenses; Attorneys' Fees.  Except as otherwise
provided in this Agreement, each party hereto will bear and pay its own
expenses of negotiating and consummating the transactions contemplated by this
Agreement.  The prevailing party in any lawsuit or litigation concerning the
construction or interpretation of this Agreement or the breach by the other
party of any provision of this Agreement shall be entitled to such party's
reasonable attorneys' fees and court costs.

         Section 17.      Headings.  The headings contained in this Agreement
are for convenient reference only and shall not in any way affect the meaning
or interpretation of this Agreement.

         Section 18.      Superseding Effect.  This Agreement supersedes any
prior agreement and understanding between the parties with respect to the
subject matter of this Agreement.

         Section 19.      Governing Law.  This Agreement shall be governed by
and construed in accordance with the laws of the State of Texas applicable to
contracts made and performed entirely therein.





                                      -7-
<PAGE>   8
         Section 20.      Waivers.  No party's rights under this Agreement will
be deemed waived except by a writing signed by such party.  Without limitation,
the occurrence of the Closing shall not be deemed a waiver of any party's
'rights except its right to refuse to close.

         Section 21.      Exhibits and Schedules.  The exhibits and schedules
referred to herein are attached hereto and by this reference made a part
hereof.

         Section 22.      Announcements.  Seller and Buyer shall consult with
each other with regard to all press releases and other announcements issued on
or prior to the Closing Date concerning this Agreement or the transactions
contemplated by this Agreement and, except as may be required by applicable
laws or the applicable rules and regulations of any governmental body or stock
exchange, neither Buyer nor Seller shall issue any such press release or other
publicity without the prior written consent of the other party.

         Section 23.      Partial Invalidity.  In the event any provision of
this Agreement is determined to be invalid or unenforceable, then the remainder
of this Agreement shall not be affected thereby.

         Section 24.      Specific Performance.  In addition to all other
remedies, at law or in equity, to which either party may be entitled, Seller
and Buyer shall each be entitled to specific performance of this Agreement,
because the remedies provided at law for any breach of this Agreement are
inadequate and damages in respect of any such breach will be difficult or
impossible to determine.

         IN WITNESS WHEREOF, the parties have executed or caused this Agreement
to be executed by an officer thereunto duly authorized as of the day and year
first above written.

                                        "SELLER"
                                        
                                        INTERNATIONAL NEDERLANDEN (U.S.)
                                        CAPITAL CORPORATION, a Delaware 
                                        corporation
                                        
ATTEST:                                 
                                        
                                        By:                                   
- ----------------------------               -----------------------------------
Assistant Secretary                          Peter Y. Clinton
                                             Vice President





                                      -8-
<PAGE>   9
                                        "BUYER"
                                        
                                        PRIMEENERGY CORPORATION
                                        
ATTEST:                                 
                                        
                                        By:                                   
- ----------------------------               -----------------------------------
Secretary                                    Charles E. Drimal, Jr.
                                             President





                                      -9-
<PAGE>   10

                                  EXHIBIT "A"




ATTACHED TO AND MADE A PART OF THAT CERTAIN ASSIGNMENT, CONVEYANCE AND BILL OF
SALE DATED MAY 7, 1996, BETWEEN SARATOGA RESOURCES, INC., A TEXAS CORPORATION,
LOBO ENERGY, INC., LOBO OPERATING, INC. AS "ASSIGNORS AND PRIMEENERGY
CORPORATION AS "ASSIGNEE".


SEGNO FIELD


SARAH F. WING NOS. 1, 15, 16, 25, 29, 30, 31, 37, 39, 35, 57, 18, 3, 32, 38,
40, 41, 44, 45-L, 45-U, 47, 48, 53, 60, 62, 65-U, 69, 70, 71, 72, 78, 79, 8,
80YF, 8YD, 8YF, 24, 65-L, 29, 76, 80, 80YD &  54

An undivided one hundred percent (100%) percent Working Interest equal to an
undivided seventeen (17%) percent Net Revenue Interest in and to that certain
Oil, Gas and Mineral Lease and leasehold estate, all oil and gas wells, salt
water disposal wells, injection wells, and other wells and the fee interest
known as "SEGNO Campsite", exclusive of the reservation pertaining to the SEGNO
Campsite, with all of such properties and reservations described in Assignment
and Bill of Sale dated March 30, 1992 by and between Chevron U.S.A., Inc. and
Lobo Resources, Ltd., said Assignment of record in Vol. 841, pages 565 et seq.,
Official Records of Polk County, Texas, and in the Official Records of Hardin
County, Texas, with reference to such Assignment and Exhibits and its recording
for a more particular description of properties of Lobo Resources, Ltd.  Said
properties hereinabove described are subject to that certain Conveyance of
Overriding Royalty Interest between Lobo Resources, Ltd. and Morgan Guaranty
Trust of New York, as Trustee, effective February 2, 1992 as recorded in Volume
841, Page 578, of the Official Records, Polk County, Texas.  Recorded in Volume
943, Page 216, of the Official Records, Hardin County, Texas.  Said properties
hereinabove described are also subject to that certain unrecorded Ancillary
Agreement, between Lobo Resources, Ltd. and Morgan Guaranty Trust Company of
New York, as Trustee, effective February 2, 1992, that certain unrecorded
Assumption Agreement dated February 16, 1994, by and between Lobo Energy, Inc.,
a Texas corporation, ("Successor Assignor"), Lobo Resources, Ltd., a Texas
limited partnership ("Assignor"), and Morgan Guaranty Trust Company of New
York, as Trustee; and subject to that certain unrecorded Ancillary Agreement
dated effective October, 1994 by and between Lobo Energy, Inc., a Texas
corporation and Morgan Guaranty Trust Company of New York, as Trustee; and
subject to that certain Conveyance of Overriding Royalty Interest dated
effective October, 1994 by and between Lobo Energy, Inc., a Texas corporation
("Assignor") and Morgan Guaranty Trust Company  of New York as Trustee,
recorded in Volume 949, Page 484 of the Official Records of Polk County, Texas;
and subject to that certain unrecorded Assumption Agreement effective March 30,
1995 by and between Saratoga Resources, Inc., a Texas corporation ("Successor
Assignor"), Lobo Energy, Inc., a Texas corporation ("Assignor"), and Morgan
Guaranty Trust Company of New York, as Trustee.


GUERRA FIELD

JOHN & ELVA DINN NOS. 1 D & 2

An undivided 3.35% Working Interest equal to a 2.479% Net Revenue Interest in
and to 81.9 acres out of that certain Oil and Gas Lease dated September 15,
1986, executed by J. H. Dinn and Elvella D. Mann, Co-Trustees of the Dinn
Mineral Trusts, as Lessor, to Roberto R. Salinas, as Lessee.  SOFAR AND ONLY
INSOFAR AS this assignment pertains to the Lobo Resources, Ltd., John and Elva
Dinn No. 1 Gas Well and the Lobo Resources, Ltd. John and Elva Dinn Well No. 2
and 81.9 acres surrounding and held by




                                      1
<PAGE>   11
production by the two subject wells.  Said lands being out of Survey 668,
bearing Duval County Abstract 1872 and Webb County Abstract 2650, Certificate
4/88, J. Poitevent Original Grantee containing 655.22 acres in its entirety,
situated partially in Webb County and partially in Duval County, being all of
the South one-half (S   1/2) of Survey 668 and all of the West one-half (W
1/2) of the Northwest one-quarter (NW  1/4) of said survey 668; less and
excepting, however, all strata, zones, horizons and depths above a depth of
6,200 feet beneath a 40-acres tract out of the West one-half (W 1/2) of said
Survey and all of the strata, zones, horizons and depths above a depth of 4,500
feet beneath all other acreage covered by such lease, which lease appears of
record in Volume 1196, pp. 796, et seq., of the Real Property Records of Webb
County, Texas, to which reference is here made to fully describe the oil and
gas zones and strata covered thereby and excepted therefrom and all other terms
and provisions thereof.

DINN MINERAL TRUST NOS. 1, 2, & 3

An undivided 1.80% Working Interest equal to a 1.35% Net Revenue Interest in
and to the Lobo Resources, Ltd., The Dinn Mineral Trusts Gas Well No. 1 and Gas
Well No. 2 along with two (2) separate forty (40) acre well units held by and
surrounding the two (2) subject wells and an undivided 3.15% Working Interest
equal to a 2.3625% Net Revenue Interest in and to the Lobo Resources, Ltd., The
Dinn Mineral Trusts Gas Well No. 3 along with one (1) separate forty (40) acre
well unit held by and surrounding the subject well.  Said 120 acres being out
of that certain Oil and Gas Lease dated September 2, 1985, executed by J. H.
Dinn and Elvella D. Mann, Co-Trustees of the Dinn Mineral Trusts, as Lessor, to
Lobo Resources, Ltd., as Lessee.  SOFAR AND ONLY INSOFAR AS this assignment
pertains to the Lobo Resources, Ltd.  The Dinn Mineral Trusts Gas Wells No. 1,
Gas Well No. 2, and Gas Well No. 3 along with the three (3) separate forty (40)
acre well units held by and surrounding the three subject wells.  Said lands
covering the oil and gas zones, strata and horizons BELOW depths of 4,500 feet
beneath the North 279.8 acres of Survey 62, Certificate 7943, Duval County
Abstract No. 1904, and 245.7075 acres out of Survey 668, Duval County Abstract
No. 1872, Certificate 2/88, being the East one- half (E  1/2) of the Northwest
one-quarter (NW  1/4) and all of the Northeast one-quarter (NE  1/4) of said
Survey 668, aggregating 525.7075 acres, situated partially in Webb County,
Texas, and partially in Duval County, Texas, which lease is recorded in Volume
405, pp. 219-238, Lease Records of Duval County, Texas, and Volume 1134, pp.
366-385, Real Property Records of Webb County, Texas, with reference being here
made to such lease and its recording to fully set forth its terms and
provisions and estates covered thereby.

DINN MINERALS TRUST NO. 1 A

An undivided 83.2% Working Interest, equal to a Net Revenue Interest of 62.4%
subject however to Participation Agreements with third party investors since
lease inception obligating Lobo Resources, Ltd. to pay out to them in certain
proportions 61.05% of the net proceeds, leaving a 1.8% Working Interest and
1.35% Net Revenue Interest vested in Lobo Resources, Ltd., in and to 40 acres
out of that certain Oil and Gas Lease dated July 21, 1986, executed by J. H.
Dinn and Elvella D. Mann, Co-Trustees of the Dinn Mineral Trusts, as Lessor, to
Lobo Resources, Ltd., as Lessee.  SOFAR AND ONLY INSOFAR as this assignment
pertains to the Lobo Resources, Ltd., The Dinn Mineral Trust Well No. A-1 and
lands held by production unit surrounding subject well, and covering the oil
and gas zones, strata and horizons ABOVE depths of 4,500 feet beneath the North
279.8 acres of survey 62, Certificate 7943, Duval County Abstract No. 1904, and
245.7075 acres out of Survey 668, Duval County Abstract no. 1872, Certificate
2/88, being the East one-half (E  1/2) of the Northwest one-quarter (NW  1/4)
and all of the Northeast one-quarter (1/4) (NE 1/4) of said Survey 668,
aggregating 525.7075 acres, situated partially in Webb County, Texas, and
partially in Duval County, Texas, which lease is recorded in Volume 1188, pp.
124-141, Real Property Records of Webb County, Texas, with reference being here
made to such lease and its recording to fully set forth its terms and
provisions and estate covered thereby.





                                       2
<PAGE>   12
G. B. MOGLIA NO. 1

An undivided 3.35% Working Interest, equal to a Net Revenue Interest of 2.345%
in and to that certain Oil and Gas Lease by and between Alice Moglia, et al.
and Lobo Resources, Ltd. dated May 7, 1987, of record in Volume 1243, pp.
200-217, Official Records of Webb County, Texas, covering the East one-half of
survey 672, Abstract 205, Certificate 1/269, Original Grantee J. Poitevent,
patented by the State of Texas to Lod Moglia by Patent No. 267, V. 2-B, Volume
190, pages 302-303, Deed Records of Webb County, Texas, as to all depths, zones
strata and horizons, only to the extent of 80 acres in and around the Lobo
Resources, Ltd.-GB Moglia #1 Well identified by RRC #125542 located 467' from
the south line and 467' from  the east line of Moglia Survey #672; said 80
acres in the form of a square around said well with the well site being exactly
in the center from the base of the Queen City Sand down to but not below the
depth of 11,272' beneath the surface of the ground.

LOD MOGLIA NO. 1-T

An undivided 9% Working Interest, equal to a Net Revenue Interest of 6.3%, in
and to that certain 40 acres in the form of a square around said well and the
well-site being as near the center of said square as is practicable, from the
base of the Queen City Formation, down to the base of that geological horizon
or sand known as the Guerra 10,000' sand as said geological horizon or 10,000'
sand structure has been identified in logs or log runs as said Lod Moglia No. 1
Well and it's stratigraphic equivalent in the 40 acres surrounding such well in
that certain Oil, Gas and Mineral Lease dated August 27, 1979, between Ernest
Moglia, et al., as Lessors, and TKA Exploration, as Lessee, recorded in Volume
595, pages 547, et seq., of the Deed Records of Webb County, Texas, and that
certain Oil, Gas and Mineral Lease dated April 4, 1977, between Ernest Moglia,
et al, as Lessors, and Sanchez-O'Brien Petroleum Group, as Lessee, recorded in
Volume 536, Page 68, et seq, of the Deed Records of Webb County, Texas.  All as
more particularly described in that certain Assignment of Oil and Gas Leases
from Paisano Energy, inc. as Assignor, to Lobo Resources, Ltd., as Assignee,
dated May 5, 1988 of record in Volume 1298, pages 361-367, Records of Webb
County, Texas.

LOD MOGLIA NO. 2

An undivided 9% Working Interest, equal to a Net Revenue Interest of 6.3% in
and to that certain Oil and Gas Lease effective May 1, 1988, executed by Alice
Moglia, a femme sole, et al., as Lessor, to Lobo Resources, Ltd., as Lessee, of
record in Volume 1298, Pages 368-387, Official Records of Webb County, Texas,
covering a Two Hundred Sixty-nine and 5/10ths (269.5) acre tract of land, more
or less, being all of Survey 2265, Certificate 200, Abstract 1886, Webb County,
Texas, excluding the North Ten (10) acres, as to all depths below the base of
the Queen City Sand formation, LESS and EXCEPT, however, the Lod Moglia #1 Well
located Two Thousand Three Hundred (2300') feet FSL and Six Hundred Fifty
(650') feet FEL of Survey 2265 and forty (40) acres in the form of a square
around said well with the well site thereof being in its center, which Forty
(40) acres extend from the base of said Queen City Sand to a depth equivalent
to the base of that geologic horizon or sand known as the Guerra Ten Thousand
(10,000') foot Sand; which lease and its terms and provisions are more fully
set forth in such lease.

GRUY ESTATE NO. 1

An undivided 15.75% Working Interest, equal to a Net Revenue Interest of
11.8125% in and to that certain Oil and Gas Lease (which includes a 9% Working
Interest, equal to a Net Revenue Interest of 6.75% covering a 40 acre tract
surrounding the Gruy Estate No. 1 Well located on such Oil and Gas Leasehold
Estate on said Oil and Gas Lease) dated June 11, 1987, executed by Viggo K.
Gruy, et al., as Lessor, to Lobo Resources Ltd., a Texas Limited Partnership,
as Lessee, the Oil and Gas strata, horizons and sands beneath Four Thousand
Five Hundred (4,500') feet below the Surface of two (2) tracts of land, located
in Duval County, Texas, with Tract One being for Four Hundred Eighty (480)
acres described as all of Survey 251, Abstract 1168, save and except the
Northwest One-





                                       3
<PAGE>   13
quarter (NW  1/4) of said Survey, and Tract Two being Three Hundred Twenty
(320) acres comprising the West One-half (W 1/2) of Survey 168, Abstract 1736,
said tracts containing Eight Hundred (800) acres, which lease and its terms and
provisions being fully set forth in said Oil and Gas Lease, with a Memorandum
thereof being recorded in Book 33, Pages 788-792, of the Official Records of
Duval County, Texas.

GRUY ESTATE NOS. 2, 3, & 4

An undivided 15.75% Working Interest, equal to a Net Revenue Interest of
11.8125% in and to that certain Oil and Gas Lease dated January 15, 1988, from
Viggo K. Gruy, et al., as Lessor, to Lobo Resources, Ltd., as Lessee, covering
Three Hundred Twenty (320) acres, being the East One-Half (E  1/2) of Survey
168, Abstract 1736, Duval County, Texas, with a Memorandum of such Oil and Gas
Lease being recorded in Book 44, Pages 245-249, Official Records of Duval
County, Texas.


EL MESQUITE FIELD

BECKER GAS UNIT NO. 1

An undivided 54.46875% Working Interest, equal to a Net Revenue Interest of
42.485625% in and to that certain Oil, Gas and Mineral Lease dated July 24,
1981, by and between Gus A. Becker and wife, Mildred L. Becker, as Lessors, and
Lobo Resources, Ltd., as Lessee, consisting of 247 acres of land, more or less,
out of part of the El Mesquite Grant, Trinidad Vela, Original Grantee, Abstract
612, Duval County, Texas, said land be more particularly described in that
certain Deed from J. A. Pena, recorded in Volume 63, Page 233, Deed Records of
Duval County, Texas, said Lease being filed of record in Volume 332, Pages
15-17, Oil and Gas Lease Records of Duval County, Texas.  SAVE AND EXCEPT ALL
DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN
HEREINABOVE DESCRIBED LEASE.

BECKER GAS UNIT NO. 1 AND J. A. RAMIREZ NOS. 1, 2, 3 & 4

An undivided 53.46875% Working Interest, equal to a Net Revenue Interest of
41.70563% in and to that certain Oil, Gas and Mineral Lease dated February 18,
1993, between Jose A. Ramirez, et al and Lobo Resources, Ltd., consisting of
334.6 acres of land, more or less, out of and a part of El Mesquite Grant,
Abstract 612, Duval  County, Texas, Trinidad Vela, Original Grantee; out of
Share 4 allotted to Francisco Vela Pena in the original partition of said grant
and being all of the tract of land allotted to Ygnacia S. de Vela in that
certain partition deed dated November 15, 1917, and recorded in Volume 10, Page
419, Deed Records of Duval County, Texas, and all of the 2.6 acres described in
that certain deed dated February 26, 1921, and recorded in Volume 18, Page 569,
Deed Records of Duval County, Texas, SAVE and EXCEPT 160 acres described in
that certain Oil, Gas and Mineral Lease dated July 22, 1974, and recorded in
Volume 232, Page 46, Oil and Gas Lease Records of Duval County, Texas, as
amended in that certain instrument dated August 22, 1974, and recorded in
Volume 233, Page 204, Oil and Gas Lease Records of Duval County, Texas, said
Oil and Gas Lease being filed of record in Volume 356, Pages 212-215, Oil and
Gas Lease Records of Duval County, Texas.  SAVE AND EXCEPT ALL DEPTHS BELOW
8,100 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED
LEASE.

An undivided 53.46875% Working Interest, equal to a Net Revenue Interest of
41.70563% in and to that certain Oil, Gas and Mineral Lease dated July 17,
1981, between Jesus G. Pena and Lobo Resources, Ltd., consisting of 10.94 acres
of land, more or less, out of a 245.519 acre tract being the southwest  1/2 of
a 494.0 acre tract in the Mesquite Grant, Trinidad Vela, Original Grantee, as
partitioned under Partition Deed dated May 2, 1977, from Angelina P. Waterman,
et al. to themselves, of record in Volume 225, Pages 401-413 of the Deed
Records of Duval County, Texas, and more fully described under Tract D of above
described Partition Deed, said Oil and Gas lease being filed of record in
Volume 332, Pages 20-21, Oil and Gas Lease Records of Duval County,





                                       4
<PAGE>   14
Texas.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID
LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

An undivided 53.46875% Working Interest, equal to a Net Revenue Interest of
41.70563% in and to that certain Oil, Gas and Mineral Lease dated July 17,
1981, between Alicia P. Pena, et al. and Lobo Resources, Ltd., consisting of
10.94 acres of land, more or less out of a 245.519 acre tract being the
southwest  1/2 of 494.0 acre tract in the Mesquite Grant, Trinidad Vela,
Original Grantee, as partitioned under Partition Deed dated May 2, 1977, from
Angelina P.  Waterman, et al. to themselves, of record in Volume 225, Pages
401-413, Deed Records of Duval County, Texas, and more fully described under
Tract C of above described Partition Deed, said Oil and Gas Lease being filed
of record in Volume 332, Pages 13-14, Oil and Gas Lease Records of Duval
County, Texas.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE
OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

An undivided 53.46875% Working Interest, equal to a Net Revenue Interest of
41.70563% in and to that certain Oil, Gas and Mineral Lease dated July 17,
1981, between Octavio F. Pena, Jr. and Lobo Resources, Ltd., consisting of
47.60 acres of land, more or less, being the northeasterly 47.60 acres of a
tract containing 95.413 acres of land out of 245.519 acre tract being the
southwest  1/2 of 494.0 acre tract in the Mesquite Grant, Trinidad Vela,
Original Grantee, as partitioned under Partition Deed dated May 2, 1977, from
Angelina P. Waterman, et al. to themselves, of record in volume 225, Pages
401-413, Deed Records of Duval County, Texas, and more fully described under
Tract E of above described Partition, said Oil and Gas Lease being filed of
record in Volume 332, Pages 9-10, Oil and Gas Lease Records of Duval County,
Texas.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID
LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

An undivided 53.46875% Working Interest, equal to a Net Revenue Interest of
41.70563% in and to that certain Oil, Gas and Mineral lease dated July 17,
1981, between George F. O. Pena and Lobo Resources, Ltd., consisting of 52.92
acres of land, more or less, being the northeasterly 52.92 acres of a tract
containing 106.346 acres of land out of a 245.519 acres tract being the
southwest  1/2 of 494.0 acre tract in the Mesquite Grant, Trinidad Vela,
Original Grantee, as partitioned under Partition Deed dated May 2, 1977, from
Angelina P. Waterman, et al. to themselves, of record in Volume 225, Pages
401-413, Deed Records of Duval County, Texas, and more fully described under
Tract F of above described Partition, said Oil and Gas Lease being filed of
record in Volume 332, Pages 18-19, Oil and Gas Lease Records of Duval County,
Texas. SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID
LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

F. GARCIA, ET AL NOS. 1, 2, 3, 4, 5, 6, 7, 8 & 9

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
30.331615% in and to that certain Oil, Gas and Mineral Lease dated September
26, 1983, by and between Fernando Garcia Moreno, et al., as Lessors, and Mobil
Producing Texas & New Mexico, Inc. as Lessee, covering 2988.61 acres, more or
less, in Duval County, Texas as therein described, said Oil and Gas Lease
recorded in Book 368, pages 386-390 in the Oil and Gas Lease Records of Duval
County, Texas, and being subject to and all more particularly described in
Farmout Agreement dated August 1, 1988, by and between Lobo Resources, Ltd. and
Mobil Exploration and Producing U.S., Inc., covering the following tract of
land:

A tract of land in Duval County, Texas, containing 2988.61 acres of land, more
or less, comprised of part of the Santa Maria de los Angeles de Abajo Grant,
Trinidad Vela, Original Grantee, Abstract 612, also known as El Mesquite Grant,
all of R. & V. Guerra Survey 170, Abstract 1257, all of G.C. & S.F.R.R. Survey
171, Abstract 861, Part of Porfirio Garza Survey 172, Abstract 1249, Part of
Porfirio Garza Survey 174, Abstract 1250, part of G.C. & S.F.R.R. Survey 173,
Abstract 860, and Part of G.C. & S.F.R.R. Survey 169, Abstract 862, and also
being Share 5 as set out in Partition Proceedings had n





                                       5
<PAGE>   15
Cause No. 5674, styled Manual Benavides Volpe vs. Servando Benavides, et al.
had in the 49th District Court of Webb County,  Texas.  Covering lands more
particularly described hereinbelow, as production units earned under the
hereinabove described Farmout Agreement as follows:

         (a)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 1,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective September 15, 1988.  Said
         assignment of record in Volume 85, page 127-136 Official Records of
         Duval County, Texas.

         (b)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 2,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective December 16, 1988.  Said
         assignment of record in Volume 85, page 137-146 Official Records of
         Duval County, Texas.

         (c)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 3,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective April 11, 1989.  Said
         assignment of record in Volume 85, page 147-156 Official Records of
         Duval County, Texas.

         (d)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 4,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective January 16, 1990.  Said
         assignment of record in Volume 99, page 107-116 Official Records of
         Duval County, Texas.

         (e)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 5,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective May 15, 1990.  Said
         assignment of record in Volume 109, page 630-638 Official Records of
         Duval County, Texas.

         (f)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 6,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective May 1, 1991.  Said
         assignment of record in Volume 114, page 521-528 Official Records of
         Duval County, Texas.

         (g)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 7,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective May 2, 1991.  Said
         assignment of record in Volume 133, page 773-780 Official Records of
         Duval County, Texas.

         (h)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 8,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective February 27, 1992.  Said
         assignment of record in Volume 133, page 781-788 Official Records of
         Duval County, Texas.

         (i)  Assignment of Oil, Gas and Mineral Lease Lobo Garcia Well No. 9,
         from Mobil Producing Texas and New Mexico, Inc. as Assignor, to Lobo
         Resources, Ltd. as Assignee, dated effective June 4, 1992.  Said
         assignment of record in Volume 137, page 615-623 Official Records of
         Duval County, Texas.

         Above described lands being subject to certain unrecorded
         Participation Letters along with Joint Operating Agreement dated
         August 30, 1988





                                       6
<PAGE>   16
         between Lobo Resources, Ltd., as Operator and various working interest
         parties, as non operator.

         Together with all rights and interests assigned to Lobo Resources,
         Ltd. in that Partial Assignment of Oil and Gas Leases as more
         particularly described in subject Partial Assignment of Oil and Gas
         Leases dated effective October 23, 1990 of record in Volume 112, Page
         780, Official Records, Duval County, Texas and that certain unrecorded
         letter agreement dated October 23, 1990 by and between El Mesquite
         Joint Venture I, by Humberto Fasci, III, et al., as Assignor, and Lobo
         Resources, Ltd., as Assignee.

C. F. GERMER NOS. 1, 2, 3 & 4

An undivided 29.765625% Working Interest, equal to a Net Revenue Interest of
23.21725% in and to that certain Oil, Gas and Mineral Lease dated January 28,
1982, by and between John Temple Rogers, as Lessor, and Lobo Resources, Ltd. as
Lessee, said lease being recorded in Volume 351, Pages 254-255, Oil and Gas
Lease Records, Duval County, Texas, and covering the following described
property:

         615 acres of land, more or less, out of the El Mesquite Grant,
         Abstract 612, Duval County, Texas, being further described in said
         Oil, Gas and Mineral Lease, reference to which lease is here made for
         all purposes; as amended by Extension of Primary Term dated June 2,
         1986, executed by Cogie Fae Germer, Individually and as Independent
         Executrix of the Will of John Temple Rogers, Deceased, joined by her
         husband, Richard H. Germer, as recorded in Book 14, Pages 75-76,
         Official Records, Duval County, Texas; and as ratified under
         Ratification and Extension of Primary Term of Oil and Gas Lease dated
         January 15, 1988, executed by Cogie Fae Germer, Individually and as
         Independent Executrix of the Will of John Temple Rogers, Deceased,
         joined by her husband, Richard H. Germer, as recorded under File No.
         25355, Official Records of Duval County, Texas.  SAVE AND EXCEPT ALL
         DEPTHS BELOW 8,100 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN
         HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd., in
that Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gase Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

C. F. GERMER NOS. A-1, A-2, A-3 & A-4

An undivided 43.6426117% Working Interest, equal to a Net Revenue Interest of
32.731959% in and to that certain Oil, Gas and Mineral Lease dated June 2,
1988, by and between Cogie Fae Germer and husband, Richard H. Germer, as
Lessor, and Lobo Resources, Ltd., as Lessee, said Lease being recorded in Book
53, pages 307-309, Official Records of Duval County, Texas.  SAVE AND EXCEPT
ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS covering two tracts
of land comprising 556 acres described as follows:

         First Tract:  74 acres of land, more or less, off of the Southwest end
of 98.8 acres known as Share No. 1, out of the "El Mesquite" Santa Maria De Los
Angeles De Abajo Trinidad Vela Grant, Abstract 612, as set aside and allotted
to Paula Salinas de Flores in a Deed of Partition made by and between the heirs
and assigns of Evaristo Salinas, deceased, duly of record in the Deed Records
of Duval County, Texas, said 74 acres of land being the identical 74 acres
conveyed by Paula Salinas de Flores and husband Sabas Flores, to E. J. Rogers
by Warranty Deed dated September 5, 1924, and recorded in Volume 24, Pages
514-516 of the Deed Records of Duval County, Texas and reference is





                                       7
<PAGE>   17
hereby made to said recorded deed for a more particular and detailed
description of said 74 acres of land.

         Second Tract:  482 acres of land, more or less, out of the "El
Mesquite" Santa Maria De Los Angeles De Abajo Trinidad Vela Grant, Abstract
612, off of the Southwest end of a 1482 acre tract, said 1482 acres being the
same 1482 acres described by metes and bounds in a Survey made for E. J. Rogers
by Hays Dix, Surveyor, on February 22nd to 25th, 1921, which Survey is duly
recorded in Volume 18, Pages 540-541, Deed Records of Duval County, Texas
EXCEPT THAT THE 2.6 acres of land out of the Southwest end of said 1482 acres
conveyed by El. J. Rogers to G. N. Olson by deed dated February 26, 1921 and
recorded in Volume 18, Pages 569-570, Deed Records of said County, has been
reacquired and is now owned by Lessors and is covered by this lease, while, in
turn, a like amount of 2.6 acres has been conveyed to G. N.  Olson out of and
off of the extreme Southwest end of said 1482 acre tract and is not covered by
this lease.  It being the intention of Lessors herein that this lease covers
and includes all of said 1482 acre tract as now owned by Lessors, SAVE AND
EXCEPT the Northeast 1000 acres which was conveyed by Lessors to Juan
Benavides.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

DANA HELLEN NOS. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 &11

An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil and Gas Lease dated September 13, 1988, by and between
Dana Hellen Mineral, Ltd., A Texas Limited Partnership, acting herein by and
through Dana L. Hellen and Margaret Ray Hellen, its General Partners of P. O.
Box 244, Hebbronville, Texas 78361, as Lessor, and Lobo Resources, Ltd., as
Lessee covering 2016.8 acres, more or less, out of Duval County School Land
Survey 150, Abstract 365, Jim Hogg County, Texas; all being more particularly
described in Memorandum of Oil and Gas Lease dated October 14, 1988, executed
by Dana Hellen Mineral, Ltd., by and through Dana L. Hellen and Margaret Ray
Hellen, its General Partners, as Lessee, and Lobo Resources, Ltd., as Lessor,
and recorded in Volume 124, Pages 366-370, Oil and Gas Lease Records, Jim Hogg
County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.





                                       8
<PAGE>   18
J. J. & J. FIELD

A. A. URIBE NO. 1

An undivided 75% Working Interest, equal to a Net Revenue Interest of 59.25% in
and to that certain Oil and Gas Lease dated December 1, 1986, by and between
Adolfo A. Uribe, whose address is 1715 Lyon, Laredo, Texas 78040, hereinafter
called "Lessor of First Tract," hereinafter described, and Alfredo Uribe,
Ramiro Uribe, Individually ad as Attorney-in- Fact for Lenore Williams Uribe,
widow of Elpidio Uribe, Deceased, and their two (2) children, namely Louis Carl
Uribe and China Davis, who are and constitute the sole heirs at law of Elpidio
Uribe, Deceased, who died intestate, whose collective address is 217 Wedgewood,
Laredo, Texas 78041, herein called "Lessor of Second Tract", hereinafter
described, and Lobo Resources, Ltd., whose address is P. O. Box 3125, Laredo,
Texas 78044-3125, hereinafter called "Lessee", said Oil and Gas Lease of record
in Volume 356, Pages 102-104, Official Records of Zapata County, Texas,
covering two (2) tracts of land, each of which are located in Zapata County,
Texas, to-wit:

         First Tract:  A 232.133 acre tract known as Tract No. 5 out of Share 3
of the Plateado Pasture, which, in accordance with survey made by Alfredo
Barrera, Registered Public Surveyor, contains 1,054.744 acres, which Plateado
Pasture consists of all of Share No. Three 93) awarded to Blas Maria Uribe
under November 15, 1909 Partition Deed as recorded in Volume 6, pp. 307-14,
Deed Records of Zapata County.  Said 232.133 acres was partitioned to Amador
Uribe as Tract No. Five (5) under a Partition Deed dated the 17th day of April
1973, as recorded inVolume 175, pp. 638-662, Deed Records of Zapata County, and
reference is here made to said partition Deed as executed by Amador Uribe and
other owners of the Petra Garza de Uribe Estate and to the record of said
Partition Deed as well as to a plat by Alfredo Barrera dated the 24th day of
November, 1972, showing a partition of said 1,054.744 acre tract known as
Plateado Pasture for the location as well as course and distance description of
said Tract No. 5.

         Second Tract:  A 87.867 acre tract out of a larger 232.133 acre tract,
being all of Tract No. 4 out of Share No. 3 of the San Ygnacio Subdivision of
the Jose Vasquez Borrego Grant deeded to Elpidio Uribe, Ramiro Uribe and
Alfredo Uribe in that certain Partition Deed dated April 17, 1973, recorded in
Volume 175, Pages 638-662, Deed Records of Zapata County, Texas.


EL MESQUITE FIELD

A. BENAVIDES NOS. C-1, C-2, C-3 & C-4

An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil and Gas Lease dated March 1, 1989, by and between
Cleotilde F. Benavides; Sara Alicia B. Trautmann, Independent Executrix of the
Estate of Alonzo Benavides, Deceased Juan M. Benavides, Jr.; Hector Alonzo
Benavides, acting herein by and through his Attorney-in-Fact, Juan M.
Benavides, Jr. And Maria Elisa B. Gonzales of 519 Merlin, Laredo, Webb County,
Texas 78041, as Lessor, and Lobo Resources, Ltd., a Texas Limited Partnership,
as Lessee whose address is P. O. Box 3125, Laredo, Webb County, Texas
78044-3125, covering 1120 acres out of Subdivision No. 1 and Subdivision No. 2
of the S. J. Carpenter Subdivision of El Mesquite Grant, Duval County, Texas,
as described in Memorandum of Oil and Gas Lease dated March 1, 1989, recorded
in Book 69, Pages 810-816, Official Records of Duval County, Texas.

Together with all rights and interest assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.





                                       9
<PAGE>   19
CLEO BENAVIDES NOS. A-1 & A-2

An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil and Gas Lease dated October 27, 1988, by and between
Juan M. Benavides, Jr.; Hector Alonzo Benavides, acting herein by and through
his Attorney-in-Fact, Juan M. Benavides, Jr. And Maria Elisa B. Gonzalez, as
Lessor, and Lobo Resources, Ltd., a Texas Limited Partnership, as Lessee, whose
address is P. O. Box 3125, Laredo, Webb County, Texas 78044-3125, covering the
following described land in Duval County, Texas, to-wit:

         200 acres, more or less, out of that certain 640 acre tract out of the
         southeast corner of Subdivision No. 2 of the S. J. Carpenter
         Subdivision of El Mesquite Grant as per map of said Subdivision No. 2
         dated September 7, 1922, prepared by E. J. Foster, Surveyor and of
         record in Volume 21, Pages 556, et seq., of the Deed Records of Duval
         County, Texas, which 200 acre tract is more fully described as being
         all of the southeast one-half of said 640 acre part of Subdivision No.
         2 LESS and EXCEPT a 40 acre tract out of the south corner of said 640
         acre tract and 80 acres in the form of a rectangle out of the east or
         northeast end of said southeast one-half ( 1/2) of said 640 acre
         tract; and

as described in Memorandum of Oil and Gas Lease dated February 13, 1989,
recorded in Book 68, Pages 740-744, Official Records of Duval County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

CLEO BENAVIDES NOS. B-1 & B-2

An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil and Gas Lease dated October 27, 1988, by and between
Cleotilde F. Benavides; Sara Alicia B. Trautmann, Independent Executrix of the
Estate of Alonzo Benavides, Deceased; Juan M. Benavides, Jr.; Hector Alonzo
Benavides, acting herein by and through his Attorney-in-Fact, Juan M.
Benavides, Jr. And Maria Elisa B. Gonzales of 519 Merlin, Laredo, Webb County,
Texas 78041, as Lessor, and Lobo Resources, Ltd., a Texas Limited Partnership,
as Lessee, whose address is P. O. Box 3125, Laredo, Webb County, Texas
78044-3125, covering the following described land in Duval County, Texas,
to-wit:

         160 acres of land, more or less, out of El Mesquite Grant, Duval
         County, Texas, and being all of block 24 containing 40 acres out of
         Subdivision No. 1 of the S. J. Carpenter Subdivision of El Mesquite
         Grant; Blocks 23 and 24, each containing 40 acres, out of Subdivision
         No. 2 of the S. J. Carpenter Subdivision of the El Mesquite Grant, and
         40 acres out of the South or southwest corner of the 640 acre tract
         out of the southeast corner of the S. J. Carpenter Subdivision No. 2,
         which 40 acre tract is bounded on the southeast by the southeast
         boundary of Subdivision No. 2; on the southwest by the northeast
         boundary line of Block 24 of Subdivision No. 2; on the northwest by a
         line parallel with the southeast boundary of Subdivision No. 2 and on
         the northeast by a line parallel with and the same distance as the
         northeast line of Block 24 of Subdivision No. 2, all as per the map of
         said Subdivisions No. 1 and No. 2 of the S. J. Carpenter Subdivision
         of the El Mesquite Grant dated September 7, 1922, prepared by E. J.
         Foster, Surveyor and of record in Volume 21, Pages 556, et seq., of
         the Deed Records of Duval County, Texas; and as described in





                                       10
<PAGE>   20
         Memorandum of Oil and Gas Lease dated February 13, 1989, recorded in
         Book 68, Pages 735-739, Official Records of Duval County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

PENA  - VALDEZ GAS UNIT NO. 1 AND VALDEZ - RAMIREZ NO. 1

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Graciela V.
Garza, et vir, as Lessor, and Lobo Resources, Ltd., as Lessee, dated April 20,
1988, and said lease being duly recorded in Volume 50, Pages 398-401 of  the
Official Records, Duval County, Texas, covering that certain 232.49 acres out
of the "El Mesquite" Grant; A-612, Duval County, Texas, which reference to such
lease and its recording is herein made for a more particular description of the
lands leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE
SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd., in
that Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between R. Valdez, a
widow et al., as Lessor, and Lobo Resources, Ltd., as Lessee, dated June 7,
1988, and said lease being duly recorded in Volume 53, pages 324-329 of the
Official Records, Duval County, Texas, covering that certain 232.49 acres out
of the "El Mesquite" Grant; A-612, Duval County, Texas, which reference to such
Lease and its recording is herein made for a more particular description of the
lands leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE
SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBE LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Elma V. Corona,
et vir, as Lessor, and Lobo Resources, Ltd., as Lessee, dated April 20, 1988,
and said lease being duly recorded in Volume 50, pages 402-405 of the Official
Records, Duval County, Texas, covering that certain 232.49 acres out of the "El
Mesquite" Grant; A-612, Duval County, Texas, which reference to such lease and
its recording is herein made for a more particular description of the lands
leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE
OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter





                                       11
<PAGE>   21
agreement dated October 23, 1990 by and between El Mesquite Joint Venture I, by
Humberto Fasci, III, et al., as Assignor, and Lobo Resources, Ltd., as
Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Alfonso Valdez,
et ux., as Lessor, and Lobo Resources, Ltd., as Lessee, dated June 7, 1988, and
said lease being duly recorded in Volume 53, Pages 303-306 of the Official
Records, Duval County, Texas, covering that certain 232.49 acres out of the "El
Mesquite" Grant; A-612, Duval County, Texas, which reference to such Lease and
its recording is herein made for a more particular description of the lands
leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE
OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Elton E.
Specht, et ux., as Lessor, and Lobo Resources, Ltd., as Lessee, dated April 20,
1988, and said lease being duly recorded in Volume 50, pages 406-409 of the
Official Records, Duval County, Texas, covering that certain 232.49 acres out
of the "El Mesquite" Grant; A-612, Duval County, Texas, which reference to such
Lease and its recording is herein made for a more particular description of the
lands leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE
SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Maria V.
Hinojosa, et vir, as Lessor, and Lobo Resources, Ltd., as Lessee, dated June 7,
1988, and said lease being duly recorded in Volume 53, pages 314-317 of the
Official Records, Duval County, Texas, covering that certain 232.49 acres out
of the "El Mesquite" Grant; A-612, Duval County, Texas, which reference to such
Lease and its recording is herein made for a more particular description of the
lands leased therein.  SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE
SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al, as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Arturo Valdez,
by and through his attorney-in-fact, Maria Garcia Valdez and wife, Maria de
Jesus Garcia Valdez, Individually, as Lessor, and Lobo Resources, Ltd., as
Lessee, dated April 20, 1988, and said lease being duly recorded in Volume 50,
pages 410-413 of the Official Records, Duval County, Texas, covering that
certain 232.49 acres out of the "El Mesquite" Grant;





                                       12
<PAGE>   22
A-612, Duval County, Texas, which reference to such Lease and its recording is
herein made for a more particular description of the lands leased therein.
SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS
DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resurces, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease by and between Sylvester
Hernandez, Jr., and Norma Hernandez, as Lessor, and Lobo Resources, Ltd., as
Lessee, dated April 20, 1988, and said lease being duly recorded in Volume 50,
pages 414-417 of the Official Records, Duval County, Texas, covering that
certain 232.49 acres out of the "El Mesquite" Grant; A-612, Duval County,
Texas, which reference to such Lease and its recording is herein made for a
more particular description of the lands leased therein.  SAVE AND EXCEPT ALL
DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN
HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Leased date April 20, 1988, by and
between Jose A. Ramirez, et al., as Lessor and Lobo Resources, Ltd., as Lessee;
covering all of Lessors interest in that certain 232.49 acre tract described as
Parcel No. One (1) of Share One (1) under partition deed dated March 30, 1955,
of record in Volume 92, Page 109 of the Duval County Deed Records, and situated
in the "El Mesquite" Grant; Abstract 612, Duval County, Texas, said lease of
record in Volume 53, Pages 318-323 of the Official Records of Duval County,
Texas, which reference to such Lease and its recording is herein made for a
more particular description of lands leased therein.  SAVE AND EXCEPT ALL
DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBE IN HEREINABOVE
DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 18.75% Working Interest, equal to a Net Revenue Interest of
13.342271% in and to those certain leases comprising that certain Gas Unit for
Pogo Producing Company H. P. Guerra et al., Well No. 1, covering such leases
described in Designation and Description of Pooled Unit Pogo Producing Company
H. P. Guerra et al., Well no. 1 dated September 12, 1986, of record in Volume
118, Pages 106-113, Oil and Gas Lease Records of Jim Hogg County, Texas, which
reference to such Gas Unit Designation is hereby made for a more particular
description of the Oil and Gas Leases and leasehold properties stated therein.


GUERRA FIELD





                                       13
<PAGE>   23
J. M. GUTIERREZ NO. 1

An undivided 14.065% Working Interest, equal to a Net Revenue Interest of
10.945312% in and to that certain Oil and Gas Lease by and between Dora Vela de
Gutierrez, as Lessor, and Chambers Exploration Company, Inc., as Lessee, dated
March 20, 1978, and said lease being duly recorded in Volume 75, Pages 453, et
seq., Oil and Gas Lease Records of Jim Hogg County, Texas, covering that
certain 177.64 acres in the Ygnacio H. Gomez Survey 125, A-133, Jim Hogg
County, Texas; 61.3 acres in the T. F. Pickney Survey No. 1, A-251, Jim Hogg
County, Texas; 640 acres in the Ygnacio H. Gomez Survey 122, A-132, Jim Hogg
County, Texas; and 48.5 acres in A.B&M Survey No. 105, A-23, Jim Hogg County,
Texas. SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID
LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.

An undivided 18.75% Working Interest, equal to a Net Revenue Interest of
13.342271% in and to that certain Oil and Gas Lease by and between Romeo
Gutierrez Vela, Trustee, as Lessor, and Chambers Exploration Company, Inc., as
Lessee, dated March 20, 1978, and said lease being duly recorded in volume 75,
Pages 472, et seq., Oil and Gas Lease Records of Jim Hogg County, Texas,
covering that certain 177.64 acres in the Ygnacio H. Gomez Survey 125, A-133,
Jim Hogg County, Texas; 61.3 acres in the T. F. Pickney Survey No. 1, A-251,
Jim Hogg County, Texas; 640 acres in the Ygnacio H. Gomez Survey 122, A-132,
Jim Hogg County, Texas; and 48.5 acres in A.B&M Survey No. 105, A-23, Jim Hogg
County, Texas. SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF
SAID LANDS DESCRIBED IN HEREINABOVE DESCRIBED LEASE.


EL MESQUITE FIELD

PENA - VALDEZ GAS UNIT NO. 1

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease dated May 20, 1988, by and
between Angelina P. Waterman, as Lessor and Lobo Resources, Ltd., as Lessee,
covering 10.94 acres out of 245.519 acre tract; "El Mesquite" Grant; Abstract
612, Duval County, Texas, said lease of record in volume 52, Pages 203-206 of
the Official Records of Duval County, Texas, which reference to such Lease and
its recording is herein made for amore particular description of the lands
leased therein. SAVE AND EXCEPT ALL DEPTHS BELOW 6,000 FEET BELOW THE SURFACE
OF SAID LANDS DESCRIBE IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease dated May 20, 1988, by and
between Roberto P. Peralta and Luisa P. Moreno, as Lessor and Lobo Resources,
Ltd., as Lessee; covering 10.94 acres out of 245.519 acre tract; "El Mesquite"
Grant; Abstract 612, Duval County, Texas, said lease of record in volume 52,
Pages 310-313 of the Official Records of Duval County, Texas, which reference
to such Lease and its recording is herein made for a more particular
description of the lands leased therein. SAVE AND EXCEPT ALL DEPTHS BELOW 6,000
FEET BELOW THE SURFACE OF SAID LANDS DESCRIBE IN HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject partial





                                       14
<PAGE>   24
Assignment of Oil and Gas Leases dated effective October 23, 1990 of record in
Volume 112, Page 780, Official Records, Duval County, Texas and that certain
unrecorded letter agreement dated October 23, 1990 by and between El Mesquite
Joint Venture I, by Humberto Fasci, III, et al., as Assignor, and Lobo
Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease dated May 20, 1988, by and
between Octavio F. Pena, Jr., as Lessor and Lobo Resources, Ltd., as Lessee;
covering 95.413 acres out of 245.619 acre tract; "El Mesquite" Grant; Abstract
612, Duval County, Texas, said lease of record in Volume 52, Pages 195-198, of
the Official Records of Duval County, Texas, SAVE and EXCEPT that certain 47.6
acres included in that certain DESIGNATION OF UNIT, BECKER, ET AL. GAS UNIT NO.
1 of record in Volume 2, Pages 619-626 of the Official Records of Duval County,
Texas, which reference to such Lease and its recording is herein made for a
more particular description of the lands leased therein. SAVE AND EXCEPT ALL
DEPTHS BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN
HEREINABOVE DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

An undivided 43.642612% Working Interest, equal to a Net Revenue Interest of
32.732% in and to that certain Oil and Gas Lease dated May 20, 1988, by and
between George O. Pena, as Lessor and Lobo Resources, Ltd., as Lessee; covering
106.346 acres out of 245.519 acre tract; "El Mesquite" Grant'; Abstract 612,
Duval County, Texas, said lease of record in Volume 52, Pages 199-202, of the
Official Records of Duval county, Texas.  SAVE AND EXCEPT that certain 52.92
acres included in that certain DESIGNATION OF UNIT, BECKER, ETAL.  GAS UNIT NO.
1 of record in volume 2, Pages 619-626 of the Official Records of Duval County,
Texas, which reference to such Lease and its recording is herein made for a
more particular description of lands leased therein. SAVE AND EXCEPT ALL DEPTHS
BELOW 6,000 FEET BELOW THE SURFACE OF SAID LANDS DESCRIBED IN HEREINABOVE
DESCRIBED LEASE.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil, Gas and Mineral Leases as more particularly
described in subject Partial Assignment of Oil and Gas Leases dated effective
October 23, 1990 of record in Volume 112, Page 780, Official Records, Duval
County, Texas and that certain unrecorded letter agreement dated October 23,
1990 by and between El Mesquite Joint Venture I, by Humberto Fasci, III, et
al., as Assignor, and Lobo Resources, Ltd., as Assignee.

A. BENAVIDES NOS. E-1 & E-2

An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil and Gas Lease dated August 8, 1989, by and between
Cleotilde F. Benavides and Sara Alicia B. Trautmann, Independent Executrix of
the Estate of Alonzo Benavides, as Lessor, and Lobo Resources, Ltd., as Lessee;
covering 357.69 acres out of Subdivision No.  1 of the S. J. Carpenter
Subdivision and also out of the Gonzalez tract out of El Mesquite Grant, Duval
County, Texas, all more particularly described in that certain memorandum of
Oil and Gas Lease dated August 30, 1989, recorded in volume 81, Pages 207-211,
Official Records of Duval County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.





                                       15
<PAGE>   25
An undivided 50% Working Interest, equal to a Net Revenue Interest of 37.5% in
and to that certain Oil, Gas and Mineral Lease dated September 22, 1989, by and
between Joseph Elvin Tilton, as Lessor, and Lobo Resources, Ltd., as Lessee,
covering property situated in Duval County, Texas and being all of Lessor's
interest, believed to be an undivided 194/494 interest, in and to 37.29 acres
of land out of A-612, Duval County, Texas, described as the southwest 37.29
acres of Share 8 as per the partition of the 494 acre Gonzalez Tract, of record
in Volume 40, Pages 227-232, Duval County Deed Records, Surface to 6000 feet
only, said Oil, Gas and Mineral Lease of record in the Official Records of
Duval County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

RODOLFO PEREZ ET AL NO. 1

An undivided 50% Working Interest, equal to an undivided Net Revenue Interest
of 37.5% in and to that certain Oil, Gas and Mineral Lease dated September 22,
1989, by and between Joseph Elvin Tilton, as Lessor, and Lobo Resources, Ltd.,
as Lessee, covering property situated in Duval County, Texas and being all of
Lessor's interest, believed to be an undivided 194/494 interest, in and to
86.91 acres of land, more or less, located in A-612, Duval County, Texas, and
being the same 86.91 acres describe in Oil and Gas Lease, dated December 22,
1988, from Rodolfo C. Perez and Herminia C.  Perez to lobo Resources, Ltd., as
recorded in Volume 66, Page 322, Official Records of Duval County, Texas,
Surface to 6000 feet only, said Oil, Gas and Mineral Lease of record in the
Official Records of Duval County, Texas.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas leases dated effective October 23,
1990 of record in volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.


MOORE'S ORCHARD FIELD


An undivided 36.956522% Working Interest, equal to an undivided 25.869565% Net
Revenue Interest in and to that certain Oil, Gas and Mineral Lease, as amended,
dated September 23, 1924, by and between John M. Moore, et al., as Lessor, and
Gulf Production Company, as Lessee, of record in Volume 102, Pages 516-519 of
the Deed Records of fort Bend County, Texas, each of the hereinbelow described
tracts more particularly described in Assignments and Agreements by and between
Chevron U.S.A., Inc. as Assignor, and Lobo Resources, Ltd., as Lessee, and
subject to all terms, conditions, acreage defined, restirctions, stipulations
and obligations of the parties - that certain Farmout Agreement from Chevron
U.S.A., Inc. to Lobo Resources, Ltd., dated November 27, 1989.  INSOFAR AND
ONLY INSOFAR as said Oil and Gas Leases covers leasehold rights covering the
herein described lands:

         (1)  Forty (40) acre tract surrounding THE J. M. MOORE WELL NO. 1;
         Forty (40) acre tract surrounding the J. M. MOORE A WELL NO. 1; Forty
         (40) acre tract surrounding the J. M. MOORE B WELL NO. 1R; all as more
         particularly described in that certain In Lieu of Assignment dated
         effective June 5, 1991, by and between, Chevron U.S.A., Inc. as
         Assignor, and Lobo Resources, Ltd., as Assignee.  Said assignment of
         Record in Volume 2449,





                                       16
<PAGE>   26
         page 706-718, Official Records of Fort Bend County, Texas and also of
         Record in Volume 2605, pages 2419-2432, Official Records of Fort Bend
         County, Texas.

         (2)  Forty (40) acre tract surrounding the J. M. MOORE C WELL NO. 1 as
         more as more particularly described in that certain Assignment dated
         effective November 1, 1991, by and between, Chevron U.S.A., Inc. as
         Assignor, and Lobo Resources, Ltd., as Assignee.  Said assignment of
         Record in Volume 2459, Pages 2510-2516, Official Records of Fort Bend
         County, Texas, as amended in Amendment of Assignment and Agreement
         dated effective November 1, 1991 of Record in Volume 2619, Pages
         878-883, Official Records of Fort Bend County, Texas.

         (3)  Forty (40) acre tract surrounding the J. M. MOORE E WELL NO. 1 as
         more particularly described in that certain Assignment dated effective
         February 27, 1992, by and between, Chevron U.S.A., Inc. as Assignor,
         and Lobo Resources, Ltd., as Assignee.  Said assignment of Record in
         Volume 2504, Pages 1246- 1256, Official Records of Fort Bend County,
         Texas, as amended in Amendment of Assignment and Agreement dated
         effective February 27, 1992 of Record in Volume 2619, Pages 874-877,
         Official Records of Fort Bend County, Texas.

         (4)  Forty (40) acre tract surrounding the J. M. MOORE F WELL NO. 1 as
         more particularly described in that certain Assignment dated effective
         March 21, 1993, by and between Chevron U.S.A., Inc. as Assignor, and
         Lobo Resources, Ltd., as Assignee.  Said assignment of Record in
         Volume 2530, Pages 2155- 2161, Official Records of Fort Bend County,
         Texas, as amended in Amendment of Assignment and Agreement dated
         effective March 21, 1993.

         (5)  Forty (40) acre tract surrounding the J. M. MOORE H. WELL NO. 1
         as more particularly described in that certain Assignment dated
         effective November 3, 1992, by and between, Chevron U.S.A., Inc. as
         Assignor, and Lobo Resources, Ltd., as Assignee.  Said assignment of
         Record in Volume 2524, Pages 1502- 1509, Official Records of Fort Bend
         County, Texas.


EL MESQUITE FIELD


An undivided 25.00% Working Interest equal to an undivided 18.75% Net Revenue
Interest before payout in and to that certain Oil and Gas Lease dated December
12, 1985, between Dana Hellen Minerals, Ltd., as Lessor, and Santa Fe Energy
Company, as Lessee, recorded in Volume 114, Page 65 of the Oil and Gas Lease
Records of Jim Hogg County, Texas, covering 1000 acres of land, more or less,
situated in the Duval County School Land Survey No. 150, A-365, Jim Hogg
County, Texas, and being more fully described therein, hereinafter referred to
as the "Lease' INSOFAR AND ONLY INSOFAR as the Lease covers and pertains to the
following acreage and depths:

         TRACT TWO:  352 acres of land, more or less, out of the Duval County
         School Land Survey, Abstract No.  265, Survey No. 150, Jim Hogg
         County, Texas, as described in that certain Unit Designation of the H.
         P.  ELLSWORTH O & G PROPERTIES, #1 DANA HELLEN GAS UNIT, dated January
         8, 1990, by and between H. P.  ELLSWORTH, d/b/a H. P. ELLSWORTH OIL
         AND GAS PROPERTIES, WILLIAM E. COLSON AND WILLIAM STUBBS, III and
         recorded in Volume 131, Page 24 of the Oil and Gas Lease Records of
         Jim Hogg County, Texas, INSOFAR AND ONLY INSOFAR as it covers and
         pertains to horizons and oil and gas contained therein from the
         surface of the ground to 100 feet below the





                                       17
<PAGE>   27
         stratigraphic equivalent of the base of the El Mesquite 5,200' sand 
         as found in the H. P. Ellsworth O & G Properties #1 Dana Hellen Well;

being acreage and depths reserved by Grantor in Partial Reassignment of Oil and
Gas Lease from Grantor to Santa Fe Energy Operating Partners, L. P., et al., on
February 1, 1990, as recorded in Volume 131, Pages 130-132 of the Oil and Gas
Lease Records of Jim Hogg County, Texas, and to be assigned to Dan A. Hughes
Company by H. P. Ellsworth, et al.  under Assignment and Bill of Sale effective
July 1, 1990.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.

DANA HELLEN NO. C-1-T

An undivided 50.00% Working Interest equal to an undivided 32.50% Net Revenue
Interest before payout in and to Oil and Gas Lease dated December 12, 1985,
between Dana Hellen Minerals, Ltd., as Lessor, and Santa Fe Energy Company, as
Lessee, recorded in Volume 114, Page 65 of the Oil and Gas Lease Records of Jim
Hogg County, Texas covering 1000 acres of land, more or less, situated in the
Duval County School land Survey No. 150 A-365, Jim Hogg County, Texas, and
being more fully described therein, hereinafter referred to as the "Lease";
INSOFAR AND ONLY INSOFAR as the Lease covers and pertains to the following
acreage and depths.

         Tract One:  352 acres of land, more or less, out of the Duval County
         School Land Survey, Abstract No.  265, Survey No. 150, Jim Hogg
         County, Texas, as described in that certain Unit Designation of the H.
         P.  ELLSWORTH O & G PROPERTIES, #3 DANA HELLEN GAS UNIT, dated January
         8, 1990, by and between H. P.  ELLSWORTH, d/b/a H. P. ELLSWORTH OIL
         AND GAS PROPERTIES, WILLIAM E. COLSON and WILLIAM STUBBS, III and
         recorded in Volume 131, Page 1 of the Oil and Gas Lease Records of Jim
         Hogg County, Texas INSOFAR AND ONLY INSOFAR as it covers and pertains
         to horizons and oil and gas contained therein from the surface of the
         ground to 100 feet below the stratigraphic equivalent of the base of
         the El Mesquite 5,200' sand as found in the H. P. Ellsworth O & G
         Properties #3 Dana Hellen Well;

being acreage and depths reserved by Grantor in Partial Reassignment of Oil and
Gas Lease from Grantor to Santa Fe Energy Operating Partners, L. P., et al., on
February 1, 1990, as recorded in Volume 131, Pages 130-132 of the Oil and Gas
Lease records of Jim Hogg County, Texas, and to be assigned to Dan A. Hughes
Company by H. P. Ellsworth, et al.  under Assignment and Bill of  Sale
effective July 1, 1990.

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al., as
Assignor, and Lobo Resources, Ltd., as Assignee.


BENNETT RANCH FIELD

DRISCOLL FOUNDATION  NOS. 1, 2, 3 & 4

An undivided 90% Working Interest, equal to an undivided 67.5% Net Revenue
Interest in and to that certain oil and Gas Lease dated March 21, 1990,
executed by Robert





                                       18
<PAGE>   28
Driscoll and Julia Driscoll and Robert Driscoll, Jr. Foundation, as Lessor to
Lobo Resources, Ltd., as Lessee, which lease is recited in Notice of Oil and
Gas Lease dated April 2, 1990 but to be effective March 21, 1990 of record in
Vol.  94, pp. 228-229, Lease Records of Duval County, Texas, covering the
following described property.

         160 acres being the Southwest corner of Lot 65, Sweden Farm Lots
         Subdivision of the "Santa Rosalia" Grant; Abstract 476, Duval County,
         Texas; and that certain Oil and Gas Lease dated September 14, 1990,
         executed by Robert Driscoll, Julia Driscoll and Robert Driscoll, Jr.
         Foundation, Co-Trustees T.S.  Scibienski, Nettie Ruth Hoskons and C.
         Ivan Wilson, as Lessors, and Lobo Resources, Ltd., as Lessees,
         covering 1440 acres, more or less described in that certain notice of
         Oil and Gas Lease of Record in Volume 105, Pages 806-809, Official
         Records of Duval County, Texas and more particularly described in that
         Designation of Unit Document dated May 19, 1993 of record in Volume
         149, Pages 428-435, Official Records, Duval County, Texas.

An undivided 90% Working Interest, equal to an undivided 67.5% Net Revenue
Interest in and to that certain Oil and Gas Lease dated September 14, 1990,
executed by Roberto Driscoll, Julia Driscoll and Robert Driscoll, Jr.
Foundation, Co- Trustees T.S. Scibienski, Nettie Ruth Hoskons and C. Ivan
Wilson, as Lessors, and Lobo Resources, Ltd., as described in that certain
notice of Oil and Gas Lease of Record in Volume 105, Pages 806-809, Official
Records of Duval County, Texas; said lands being more particularly described in
that Designation of Unit Document dated May 19, 1993 of record in Volume 149,
Pages 428-435, Official Records, Duval County, Texas.


EL MESQUITE FIELD


An undivided 25% Working Interest equal to an 18.75% Net Revenue Interest in
and to that certain Oil and Gas Lease dated September 1, 1991, executed by J.
H. Dinn and Elvella D. Mann, Co-Trustees of the Dinn Mineral Trusts, as Lessor,
to Lobo Resources, Ltd. and PG&E Resources Company, as Lessee:  covering 907.88
acres, being all of Survey 666, Abstract No. 1871, Original Grantee J.
Poitenent, containing 653.88 acres of land, more or less and the South 254
acres of Survey 62, Duval County, Abstract No. 1904, Certificate 7943, Original
Grantee J. T. Dinn, being all of that portion of said Survey 62 which lies
between Survey 666 (hereinabove described) and Survey 454, together with that
portion of Survey 62 along the Northerly boundary line of Survey 666 and the
Southerly boundary line of Survey 143, situated in Duval County, Texas;
covering depths below 4,500'.  Said Oil and Gas Lease of record in Book 1377,
Pages 634-656, Official Records, Duval County, Texas.  SAVE AND EXCEPT ALL
LEASEHOLD ACREAGE DESCRIBED HEREINABOVE THAT LIES NORTH OF THE SOUTH FIVE
HUNDRED (500) LEASEHOLD ACRES OF SAID OIL AND GAS LEASE.





                                       19
<PAGE>   29
SEGNO FIELD


An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, David L. Wing, as Lessor,
and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering 62.50 acres,
more or less, situated in the I. & G. N. Railroad Section No. 13, Abstract No.
666, Polk County, Texas; being comprised of the North 31.25 acres and the South
31.25 acres of that certain 100 acre tract described as "Tract #1" in the
certain Partial Release dated June 21, 1934, executed by Gulf Production
Company, as recorded in Volume 16, Page 294 of the Oil, Gas and Mineral
Records, Polk County, Texas; being the same 62.5 acres set aside to Caroline R.
Wing et al in that certain Partition Deed dated October 14, 1936, as recorded
in Volume 109, Page 94 of the Deed Records of Polk County, Texas.  Said Oil,
Gas and Mineral Lease of record in Volume 840, Page 675 in the Official Records
of Polk County, Texas.  Said Oil and Gas Lease subject to that certain
conveyance of Overriding Royalty Interest from Lobo Resources, Ltd., (Lobo) to
Morgan Guaranty Trust of New York, as Trustee (Morgan) effective February 2,
1992 as recorded in Volume 841, Page 578 of the Official Records, Polk County,
Texas and Volume 943, Page 216 of Official Hardin County, Texas Records and
that certain Ancillary Agreement between Lobo and Morgan.  Said Oil and Gas
Lease was amended by instrument February 21, 1995, as recorded in Volume 966,
Page 709 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Constance C. Duncan
(formerly known as Constance Duncan Johnson), as Lessor, and Lobo Resources,
Ltd., as Lessee, dated March 3, 1992, covering 62.50 acres, more or less,
situated in the I. & G. N. Railroad Section No. 13, Abstract No. 666, Polk
County, Texas; being comprised of the North 31.25 acres and the South 31.25
acres of that certain 100 acre tract described as "Tract #1" in that certain
Partial Release dated June 21, 1934, executed by Gulf Production Company, as
recorded in Volume 16, Page 294 of the Oil, Gas and Mineral Records, Polk
County, Texas; being the same 62.5 acres set aside to Caroline R. Wing et al in
that certain Partition Deed dated October 14, 1936, as recorded in Volume 109,
Page 94 of the Deed Records of Polk County, Texas.  Said Oil, Gas and Mineral
Lease of record in Volume 841, Page 358 in the Official Records of Polk County,
Texas.  Said Oil and Gas Lease subject to that certain conveyance of Overriding
Royalty Interest from Lobo Resources, Ltd., (Lobo) to Morgan Guaranty Trust of
New York, as Trustee (Morgan) effective February 2, 1992 as recorded in Volume
841, Page 578 of the Official Records of Polk County, Texas and Volume 943,
Page 216 of Official Hardin County, Texas Records and that certain unrecorded
Ancillary Agreement between Lobo and Morgan.  Said Oil and Gas Lease was
amended by instrument February 23, 1995, as recorded in Volume 975, Page 461 of
the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Frank Davenport Duncan, III,
as Lessor, and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering
62.50 acres, more or less, situated in the I. & G. N. Railroad Section No. 13,
Abstract No. 666, Polk County, Texas; being comprised of the North 31.25 acres
and the South 31.25 acres of that certain 100 acre tract described as "Tract
#1" in the certain Partial Release dated June 21, 1934, executed by Gulf
Production Company, as recorded in Volume 16, page 294 of the Oil, Gas and
Mineral Records, Polk County, Texas; being the same 62.5 acres set aside to
Caroline R.  Wing et al in that certain Partition Deed dated October 14, 1936,
as recorded in Volume 109, Page 94 of the Deed Records of Polk County, Texas.
Said Oil, Gas and Mineral Lease of record in Volume 841, Page 360 in the
Official Records of Polk County, Texas.  Said Oil and Gas Lease subject to that
certain conveyance of Overriding Royalty Interest from Lobo Resources, Ltd.,
(Lobo) to Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992
as recorded in Volume 841, Page 578 of the Official Records, Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain Ancillary Agreement between Lobo and Morgan.  Said Oil





                                       20
<PAGE>   30
and Gas Lease was amended by instrument February 20, 1995, as recorded in
Volume 965, Page 550 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Larry Kamanitz and First
National Bank of Maryland, Trustees under the will of Wilson M. Wing, as
Lessor, and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering
62.50 acres, more or less, situated in the I. & G. N.  Railroad Section No. 13,
Abstract No. 666, Polk County, Texas; being comprised of the North 31.25 acres
and the South 31.25 acres of that certain 100 acre tract described as "Tract
#1" in the certain Partial Release dated June 21, 1934, executed by Gulf
Production Company, as recorded in Volume 16, Page 294 of the Oil, Gas and
Mineral Records, Polk County, Texas; being the same 62.5 acres set aside to
Caroline R. Wing et al in that certain Partition Deed dated October 14, 1936,
as recorded in Volume 109, Page 94 of the Deed Records of Polk County, Texas.
Said Oil, Gas and Mineral Lease of record in Volume 858, Page 582 in the
Official Records of Polk County, Texas.  Said Oil and Gas Lease subject to that
certain conveyance of Overriding Royalty Interest from Lobo Resources, Ltd.,
(Lobo) to Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992
as recorded in Volume 841, Page 578 of the Official Records, Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain Ancillary Agreement between Lobo and Morgan.  Said Oil and Gas Lease
was amended by instrument March 2, 1995, as recorded in Volume 964, Page 852 of
the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Daniel C. Wing, as Lessor,
and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering 62.50 acres,
more or less, situated in the I. & G. N. Railroad Section No. 13, Abstract No.
666, Polk County, Texas; being comprised of the North 31.25 acres and the South
31.25 acres of that certain 100 acre tract described as "Tract #1" in the
certain Partial Release dated June 21, 1934, executed by Gulf Production
Company, as recorded in Volume 16, Page 294 of the Oil, Gas and Mineral
Records, Polk County, Texas; being the same 62.5 acres set aside to Caroline R.
Wing et al in that certain Partition Deed dated October 14, 1936, as recorded
in Volume 109, Page 94 of the Deed Records of Polk County, Texas.  Said Oil,
Gas and Mineral Lease of record in Volume 847, Page 623 in the Official Records
of Polk County, Texas.  Said Oil and Gas Lease subject to that certain
conveyance of Overriding Royalty Interest from Lobo Resources, Ltd., (Lobo) to
Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992 as
recorded in Volume 841, Page 578 of the Official Records, Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain Ancillary Agreement between Lobo and Morgan. Said Oil and Gas Lease was
amended by instrument February 24, 1995, as recorded in Volume 964, Page 849 of
the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.90% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Deborah Wing Korol, as
Lessor, and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering
62.50 acres, more or less, situated in the I. & G. N. Railroad Section No. 13,
Abstract No. 666, Polk County, Texas; being comprised of the North 31.25 acres
and the South 31.25 acres of that certain 100 acre tract described as "Tract
#1" in the certain Partial Release dated June 21, 1934, executed by Gulf
Production Company, as recorded in Volume 16, Page 294 of the Oil, Gas and
Mineral Records, Polk County, Texas; being the same 62.5 acres set aside to
Caroline R. Wing et al in that certain Partition Deed dated October 14, 1936,
as recorded in Volume 109, Page 94 of the Deed Records of Polk County, Texas.
Said Oil, Gas and Mineral Lease of record in Volume 849, Page 169 in the
Official Records of Polk County, Texas.  Said Oil and Gas Lease subject to that
certain conveyance of Overriding Royalty Interest from Lobo Resources, Ltd.,
(Lobo) to Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992
as recorded in Volume 841, Page 578 of the Official Records, Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain Ancillary Agreement between Lobo and Morgan. Said Oil and Gas Lease was
amended by instrument February 28, 1995, as recorded in Volume 969, Page 490 of
the Official Records of Polk County, Texas.





                                       21
<PAGE>   31
An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Louis N. Madeira, Jr., as
Lessor, and Lobo Resources, Ltd., as Lessee, dated March 3, 1992, covering
62.50 acres, more or less, situated in the I. & G. N. Railroad Section No. 13,
Abstract No. 666, Polk County, Texas; being comprised of the North 31.25 acres
and the South 31.25 acres of that certain 100 acre tract described as "Tract
#1" in the certain Partial Release dated June 21, 1934, executed by Gulf
Production Company, as recorded in Volume 16, Page 294 of the Oil, Gas and
Mineral Records, Polk County, Texas; being the same 62.5 acres set aside to
Caroline R. Wing et al in that certain Partition Deed dated October 14, 1936,
as recorded in Volume 109, Page 94 of the Deed Records of Polk County, Texas.
Said Oil, Gas and Mineral Lease of record in Volume 847, Page 626 in the
Official Records of Polk County, Texas.  Said Oil and Gas Lease subject to that
certain conveyance of Overriding Royalty Interest from Lobo Resources, Ltd.,
(Lobo) to Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992
as recorded in Volume 841, Page 578 of the Official Records, Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain Ancillary Agreement between Lobo and Morgan.  Said Oil and Gas Lease
was amended by instrument February 28, 1995, as recorded in Volume 968, Page
282 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Ann M. Leonard (formerly
known as Ann M. Flemer), as Lessor, and Lobo Resources, Ltd., as Lessee, dated
March 3, 1992, covering 62.50 acres, more or less, situated in the I. & G. N.
Railroad Section No. 13, Abstract No. 666, Polk County, Texas; being comprised
of the North 31.25 acres and the South 31.25 acres of that certain 100 acre
tract described as "Tract #1" in the certain Partial Release dated June 21,
1934, executed by Gulf Production Company, as recorded in Volume 16, Page 294
of the Oil, Gas and Mineral Records, Polk County, Texas; being the same 62.5
acres set aside to Caroline R. Wing et al in that certain Partition Deed dated
October 14, 1936, as recorded in Volume 109, Page 94 of the Deed Records of
Polk County, Texas.  Said Oil, Gas and Mineral Lease of record in Volume 847,
Page 630 in the Official Records of Polk County, Texas.  Said Oil and Gas Lease
subject to that certain conveyance of Overriding Royalty Interest from Lobo
Resources, Ltd., (Lobo) to Morgan Guaranty Trust of New York (Morgan) effective
February 2, 1992 as recorded in Volume 841, Page 578 of the Official Records,
Polk County, Texas and Volume 943, Page 216 of Official Hardin County, Texas
Records and that certain Ancillary Agreement between Lobo and Morgan.  Said Oil
and Gas Lease was amended by instrument February 21, 1995, as recorded in
Volume 964, Page 846 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Rhode Island Hospital Trust
and Lewis N. Madeira, Sr., Co-Trustees under the Trusts created under the Will
of Sally Wing Madeira, as Lessor, and Lobo Resources, Ltd., as Lessee, dated
March 20,1992, covering 62.50 acres, more or less, situated in the I. & G. N.
Railroad Section No. 13, Abstract No. 666, Polk County, Texas; being comprised
of the North 31.25 acres and the South 31.25 acres of that certain 100 acre
tract described as "Tract #1" in the certain Partial Release dated June 21,
1934, executed by Gulf Production Company, as recorded in Volume 16, Page 294
of the Oil, Gas and Mineral Records, Polk County, Texas; being the same 62.5
acres set aside to Caroline R. Wing et al in that certain Partition Deed dated
October 14, 1936, as recorded in Volume 109, Page 94 of the Deed Records of
Polk County, Texas.  Said Oil, Gas and Mineral Lease of record in Volume 858,
Page 584 in the Official Records of Polk County, Texas.  Said Oil and Gas Lease
subject to that certain conveyance of Overriding Royalty Interest from Lobo
Resources, Ltd., (Lobo) to Morgan Guaranty Trust of New York (Morgan) effective
February 2, 1992 as recorded in Volume 841, Page 578 of the Official Records,
Polk County, Texas and Volume 943, Page 216 of Official Hardin County, Texas
Records and that certain Ancillary Agreement between Lobo and Morgan.  Said Oil
and Gas Lease was amended by instrument February 23, 1995, as recorded in
Volume 965, Page 556 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between Louise H. Wing, et al as
Lessor, and Lobo





                                       22
<PAGE>   32
Resources, Ltd., as Lessee, dated May 19, 1992, covering 31.25 acres more or
less, situated in the I. & G. N. Railroad Section No. 13, Abstract No. 666,
Polk County, Texas; being comprised of the North 31.25 acres of that certain
100 acre tract described as "Tract #1" in the certain Partial Release dated
June 21, 1934, executed by Gulf Production Company, as recorded in Volume 16,
Page 294 of the Oil, Gas and Mineral Records, Polk County, Texas, being the
Northernmost 31.25 acres of the 62.5 acres set aside to Caroline R. Wing et al
in that certain Partition Deed dated October 14, 1936, as recorded in Volume
109, Page 94 of the Deed Records of Polk County, Texas.  Said Oil, Gas and
Mineral Lease of record in Volume 858, Page 595 of the Official Records of Polk
County, Texas.  Said Oil and Gas Lease subject to that certain Conveyance of
Overriding Royalty Interest from Lobo Resources, Ltd., (Lobo) to Morgan
Guaranty Trust of New York (Morgan) effective February 2, 1992 as recorded in
Volume 841, Page 578 of the Official Records, Polk County, Texas and Volume
943, Page 216 of Official Hardin County, Texas Records and that certain
unrecorded Ancillary Agreement between Lobo and Morgan.  Said Oil and Gas Lease
was amended by instrument March 6, 1995, as recorded in Volume 968, Page 278 of
the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil, Gas and Mineral Lease, by and between, Nicholas Madeira,
as Lessor, and Lobo Resources, Ltd., as Lessee, dated May 19, 1992, covering
31.25 acres, more or less, situated in the I. & G. N. Railroad Section No. 13,
Abstract No. 666, Polk County, Texas, being comprised of the North 31.25 acres
of that certain 100 acre tract described as "Tract #1" in the certain Partial
Release dated June 21, 1934, executed by Gulf Production Company, as recorded
in Volume 16, Page 294 of the Oil, Gas and Mineral Records of Polk County,
Texas;  being the Northernmost 31.25 acres of the 62.5 acres set aside to
Caroline R.  Wing, et al in that certain Partition Deed dated October 14, 1936,
as recorded in Volume 109, Page 94 of the Deed Records of Polk County, Texas.
Said Oil, Gas and Mineral Lease of record in Volume 858, Page 602 of the
Official Records of Polk County, Texas. Said Oil and Gas Lease subject to that
certain Conveyance of Overriding Royalty Interest from Lobo Resources, Ltd.
(Lobo) to Morgan Guaranty Trust of New York (Morgan) effective February 2, 1992
as recorded in Volume 841, Page 578 of the Official Records Polk County, Texas
and Volume 943, Page 216 of Official Hardin County, Texas Records and that
certain unrecorded Ancillary Agreement between Lobo and Morgan.  Said Oil and
Gas Lease was amended by instrument March 15, 1995, as recorded in Volume 966,
Page 706 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Rhode Island Hospital Trust,
Independent Executor of the Estate of Allegra Maynard, Deceased, as Lessor, and
Lobo Resources, Ltd., as Lessee, dated May 7, 1992, covering 62.5 acres, more
or less, situated in the I. & G. N.  Railroad Section No. 13, Abstract No. 666,
Polk County, Texas, being comprised of the North 31.25 acres and the South
31.25 acres of that certain 100 acre tract described as "Parcel #1" in that
certain Partial Release dated June 21, 1934, executed by Gulf Production
Company, as recorded in Volume 26, Page 294 of the Oil, Gas and Mineral Records
of Polk County, Texas and being the same 62.5 acres set aside to Caroline R.
Wing in that certain Partition Deed dated October 14, 1936, as recorded in
Volume 109, Page 94 of the Deed Records of Polk County, Texas.  Said Oil, Gas
and Mineral Lease of record in Volume 858, Page 629 in the Official Records of
Polk County, Texas.  Said Oil and Gas Lease subject to that certain conveyance
of Overriding Royalty Interest from Lobo Resources, Ltd., (Lobo) to Morgan
Guaranty Trust of New York (Morgan) effective February 2, 1992 as recorded in
Volume 841, Page 578 of the Official Records, Polk County, Texas and Volume
943, Page 216 of Official Hardin County, Texas Records and that certain
Ancillary Agreement between Lobo and Morgan. Said Oil and Gas Lease was amended
by instrument April 27, 1995, as recorded in Volume 972, Page 817 of the
Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 15.68% Net Revenue Interest in and
to that certain Oil and Gas Lease, by and between, Susan Wing, as  Lessor, and
Lobo Resources, Ltd., as Lessee, dated May 19, 1992, covering 31.25 acres, more
or less, situated in the I. & G. N. Railroad Section No. 13, Abstract No. 666,
Polk County, Texas, being comprised of the North 31.25 acres and the South
31.25 acres of that certain 100 acre tract described





                                       23
<PAGE>   33
as "Tract #1" in the certain Partial Release dated June 21, 1934, executed by
Gulf Production Company, as recorded in Volume 16, Page 294 of the Oil, Gas and
Mineral Records, Polk County, Texas; being the Northermost 31.25 acres of the
62.5 acres set aside to Caroline R. Wing in that certain Partition Deed dated
October 14, 1936, as recorded in Volume 109, Page 94 of the Deed Records of
Polk County, Texas.  Said Oil, Gas and Mineral Lease of record in Volume 858,
Page 634 in the Official Records of Polk County, Texas.  Said Oil and Gas Lease
subject to that certain conveyance of Overriding Royalty Interest from Lobo
Resources, Ltd., (Lobo) to Morgan Guaranty Trust of New York (Morgan) effective
February 2, 1992 as recorded in Volume 841, Page 578 of the Official Records,
Polk County, Texas and Volume 943, Page 216 of Official Hardin County, Texas
Records and that certain Ancillary Agreement between Lobo and Morgan.  Said Oil
and Gas Lease was amended by instrument March 13, 1995, as recorded in Volume
965, Page 553 of the Official Records of Polk County, Texas.

An undivided 100% Working Interest equal to 14.8% Net Revenue Interest in and
to that certain Oil and Gas Lease dated effective December 13, 1993 between
Black Stone Minerals, as Lessor, and Lobo Resources, Ltd., as Lessee, covering
160 acres, more or less, being a part of the James Stephenson Survey, Abstract
523, Polk County, Texas and more particularly described in memorandum of Oil
and Gas Lease.  Said Memorandum of record in Volume 917, Pages 611-613, Polk
County, Texas Official Records.  Said Oil and Gas Lease subject to that certain
conveyance of Overriding Royalty Interest from Lobo Resources, Ltd., (Lobo) to
Morgan Guaranty Trust of New York, as trustee (Morgan) effective February 2,
1992 as recorded in Volume 841, Page 578 of the Official Records, Polk County,
Texas and Volume 943, Page 216 of Official Hardin County, Texas Records and
that certain Ancillary Agreement between Lobo and Morgan.


EL MESQUITE FIELD

RODOLFO PEREZ, ET AL NO. 1

An undivided 50% Working Interest equal to a 37.50% Net Revenue Interest in and
to that certain Oil and Gas Lease, dated December 22, 1988, from Rodolfo C.
Perez and Herminia C. Perez, to Lobo Resources, Ltd., covering 86.91 acres of
land out of A-612 Duval County, Texas as recorded in Volume 66, Page 322,
Official Records Duval County, Texas

Together with all rights and interests assigned to Lobo Resources, Ltd. in that
Partial Assignment of Oil and Gas Leases as more particularly described in
subject Partial Assignment of Oil and Gas Leases dated effective October 23,
1990 of record in Volume 112, Page 780, Official Records, Duval County, Texas
and that certain unrecorded letter agreement dated October 23, 1990 by and
between El Mesquite Joint Venture I, by Humberto Fasci, III, et al, Assignor,
and Lobo Resources, Ltd., as Assignee.


GUERRA FIELD


All rights and interests reserved by Lobo Resources, Ltd., in and to the Oil
and Gas Leases that were assigned to Tri-C Resources, Inc. in that certain
assignment of Oil, Gas and Mineral leases dated effective August 24, 1993
between Lobo Resources, Ltd., a Texas Limited Partnership, as Assignor, and
Tri-C Resources, Inc., as Assignee, covering lands situated in Duval and Webb
Counties, Texas as described hereinbelow:

Oil and Gas Lease dated January 29, 1991 between Armando Leal, Individually and
Attorney-in-Fact for Felicitas B. Leal; and Servando Leal, as lessor, and Lobo
Resources, Ltd., and PG&E Resources Company.  Said lease of record in Book 109,
Page 205, Duval County, Book 1472, Page 220, Webb County.  Said lease covering
all of the N/2 of Survey 461, Webb County, A-1634 and Duval County A-1440,
containing 329.02 acres, more or less, covering those certain depths as further
described in lease.





                                       24
<PAGE>   34

EL MESQUITE FIELD


Seventy-five (75%) percent of all rights, title and interests reserved by Lobo
Resources, Ltd. in and to that Partial Assignment of Oil and Gas Leases that
were assigned to Mobil Producing Texas and New Mexico, Inc. dated August 27,
1990 between Lobo Resources, Ltd., a Texas Limited Partnership, as Assignor,
and Mobil Producing Texas and New Mexico, Inc.  as Assignee, covering lands
situated in Duval County, Texas described hereinbelow as follows:

         (a)  Oil and Gas Lease by and between Graciela V. Garza, et vir, as
         Lessor, and Lobo Resources, Ltd., as Lessee, dated April 20, 1988, and
         said lease being duly recorded in Volume 50, Page 398 of the Official
         Records of Duval County, Texas covering all of Lessor's interest in
         that certain 232.49 acres out of the "El Mesquite" Grant, A-612, Duval
         County, Texas.

         (b)  Oil and Gas Lease by and between Herminia R. Valdez, a widow, et
         al, as Lessor, and Lobo Resources, Ltd., as Lessee, dated June 7,
         1988, and said lease being duly recorded in Volume 53, Page 324 of the
         Official Records of Duval County, Texas, covering all of Lessor's
         interest in that certain 232.49 acres out of the "El Mesquite" Grant,
         A-612, Duval County, Texas.

         (c)  Oil and Gas Lease by and between Elma V. Corona, et vir, as
         Lessor and Lobo Resources, Ltd., as Lessee, dated April 20, 1988, and
         said lease being duly recorded in Volume 50, page 402 of the Official
         Records of Duval County, Texas, covering all of Lessor's interest in
         that certain 232.49 acres out of the "El Mesquite" Grant, A-612, Duval
         County, Texas.

         (d)  Oil and Gas Lease by and between Alfonso Valdez, et ux, as
         Lessor, and Lobo Resources, Ltd., as lessee, dated June 7, 1988, and
         said lease being duly recorded in Volume 53, Page 303 of the Official
         Records of Duval County, Texas covering all of Lessor's interest in
         that certain 232.49 acres out of the "El Mesquite" Grant, A-612, Duval
         County, Texas.

         (e)  Oil and Gas Lease between Elton E. Specht, et ux, as Lessor, and
         Lobo Resources, Ltd., as Lessee, dated April 20, 1988, and said lease
         being duly recorded in Volume 50, Page 406 of the Official Records of
         Duval County, Texas covering all of Lessor's interest in that certain
         232.49 acres out of the "El Mesquite" Grant, A-612, Duval County,
         Texas.

         (f)  Oil and Gas Lease by and between Maria V. Hinojosa, et vir, as
         Lessor, and Lobo Resources, Ltd., as Lessee, dated June 7, 1988, and
         said lease being duly recorded in Volume 53, Page 314 of the Official
         Records of Duval County, Texas covering all of Lessor's interest in
         that certain 232.49 acres out of the "El Mesquite" Grant, A-612, Duval
         County, Texas.

         (g)  Oil and Gas Lease by and between Arturo Valdez, by and through
         his Attorney-in-Fact, Maria Garcia Valdez and wife, Maria de Jesus
         Garcia Valdez, Individually, as Lessor, and Lobo Resources, Ltd., as
         Lessee, dated April 20, 1988, and said lease being duly recorded in
         Volume 50, Page 410 of the Official Records of Duval County, Texas
         covering all of Lessor's interest in that certain 232.49 acres out of
         the "El Mesquite" Grant, A-612, Duval County, Texas.

         (h)  Oil and Gas Lease by and between Sylvester Hernandez, Jr. and
         Norma Hernandez, as Lessor, and Lobo Resources, Ltd., as Lessee, dated
         April 20, 1988, and said lease being duly recorded in Volume 50, Page
         414 of





                                       25
<PAGE>   35
         the Official Records of Duval County, Texas covering all of Lessor's
         interest in that certain 232.49 acres out of the "El Mesquite" Grant,
         A-612, Duval County, Texas.

         (i)  Oil and Gas Lease by and between Jose A. Ramirez, et al, as
         Lessor, and Lobo Resources, Ltd., as Lessee, dated April 20, 1988, and
         said lease being duly recorded in Volume 53, Page 318 of the Official
         Records of Duval County, Texas covering all of Lessor's interest in
         that certain 232.49 acres out of the "El Mesquite" Grant, A-612, Duval
         County, Texas.

         (j)  Oil and Gas Lease by and between Angelina P. Waterman, as Lessor,
         and Lobo Resources, Ltd., as Lessee, dated May 20, 1988, and said
         lease being duly recorded in Volume 52, Page 203 of the Official
         Records of Duval County, Texas covering 10.94 acres of land more or
         less.

         (k)  Oil and Gas Lease by and between Roberto P. Peralta and Luisa P.
         Moreno, as Lessor, and Lobo Resources, Ltd., as Lessee, dated May 20,
         1988, and said lease being duly recorded in Volume 53, Page 310 of the
         Official Records of Duval County, Texas covering 10.94 acres of land,
         more or less.

         (l)  Oil and Gas Lease by and between Octavio F. Pena, Jr., as Lessor,
         and Lobo Resources, Ltd., as Lessee, dated May 20, 1988, and said
         lease being duly recorded in Volume 52, Page 195 of the Official
         Records of Duval County, Texas covering 95.413 acres out of the "El
         Mesquite" Grant, A-612, Duval County, Texas; SAVE AND EXCEPT that
         certain 47.60 acres included in that certain DESIGNATION OF UNIT,
         BECKER, ET AL GAS UNIT NO. 1 of record in Volume 2, Page 619 of the
         Official Records of Duval County, Texas.

         (m)  Oil and Gas Lease by and between George O. Pena, and Lobo
         Resources, Ltd., as Lessee, dated May 20, 1988, and said lease being
         duly recorded in Volume 52, Page 199 of the Official Records of Duval
         County, Texas covering 106.346 acres out of the "El Mesquite" Grant,
         A-612, Duval County, Texas; SAVE AND EXCEPT that certain 52.92 acres
         included in that certain DESIGNATION OF UNIT, BECKER ET AL GAS UNIT
         NO. 1 of record in Volume 2, Page 619 of the Official Records of Duval
         County, Texas.

         (n)  Oil and Gas Lease by and between Gus A. Becker and wife, Mildred
         L. Becker, as Lessor, and Lobo Resources, Ltd., as Lessee, dated July
         24, 1981, and said lease being duly recorded in Volume 332, Page 15 of
         the Oil and Gas Lease Records of Duval County, Texas covering 247
         acres out of the "El Mesquite" Grant, A-612, Duval County, Texas.

         (o)  Oil and Gas Lease by and between Alicia Pena, et al, as Lessor,
         and Lobo Resources, Ltd., as Lessee, dated July 17, 1981, and said
         lease being duly recorded in Volume 332, Page 13 of the Oil and Gas
         Lease Records of Duval County, Texas covering 10.94 acres of land,
         more or less.

         (p)  Oil and Gas Lease by and between Jesus G. Pena, as Lessor, and
         Lobo Resources, Ltd., as Lessee, dated July 17, 1981, and said lease
         being duly recorded in Volume 332, Page 20 of the Oil and Gas Lease
         Records of Duval County, Texas covering 10.94 acres out of the "El
         Mesquite" Grant, A-612, Duval County, Texas.

         (q)  Oil and Gas Lease by and between Octavio F. Pena, Jr., as Lessor,
         and Lobo Resources, Ltd., as Lessee, dated July 17, 1981, and being
         duly recorded in Volume 332, Page 9 of the Oil and Gas Lease Records
         of Duval County, Texas covering 95.413 acres out of the "El Mesquite"
         Grant, A-612, Duval County, Texas; SAVE AND EXCEPT that certain





                                       26
<PAGE>   36
         47.813 acres included in that certain DESIGNATION OF UNIT, PENA-VALDEZ
         AS GAS UNIT NO. 1 of record in Volume 73, Page 436 of the Official
         Records of Duval County, Texas.

         (r)  Oil and Gas Lease by and between George O. Pena, as Lessor, and
         Lobo Resources, Ltd., as Lessee, dated July 17, 1981, and said lease
         being duly recorded in Volume 332, Page 18 of the Oil and Gas Lease
         Records of Duval County, Texas covering 106.346 acres out of the "El
         Mesquite" Grant, A-612, Duval County, Texas; SAVE AND EXCEPT that
         certain 53.426 acres included in that certain DESIGNATION OF UNIT,
         PENA-VALDEZ AS GAS UNIT NO. 1 of record in Volume 73, Page 436 of the
         Official Records of Duval County, Texas.

         (s)  Oil and Gas Lease by Manuel G. Serna, et al, as Lessor, and Lobo
         Resources, Ltd., as Lessee, dated January 13, 1989, and being duly
         recorded in Volume 69, Page 376 of the Official Records of Duval
         County, Texas covering 83.218 acres out of the "El Mesquite" Grant,
         A-612, Duval County, Texas.

         (t)  Oil and Gas Lease by and between Cogie Fae Germer, as Lessor, and
         Lobo Resources, Ltd., as Lessee, dated June 2, 1988, and being duly
         recorded in Volume 53, Page 307 of the Official Records of Duval
         County, Texas covering 556 acres out of the "EL Mesquite" Grant,
         A-612, Duval County, Texas.

         (u)  Oil and Gas Lease dated January 28, 1982, between John Temple
         Rogers, as Lessor, and Lobo Resources, Ltd., as Lessee, covering 615
         acres of land, more or less, recorded in Volume 351, Page 254 of the
         Official Records of Duval County, Texas.

         (v)  Oil and Gas Lease dated February 18, 1983, between Jose A.
         Ramirez, et al, as Lessor, and Lobo Resources, Ltd., as Lessee,
         covering 334.6 acres of land, more or less recorded in volume 356,
         Page 212 of the Official Records of Duval County, Texas.


SEGNO FIELD


Oil, Gas and Mineral Lease dated October 7, 1994, from Carla Ann Blumberg, et
al, Lessor, to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 805 of
the Official Records of Polk County, Texas.

Oil, Gas and Mineral lease dated October 11, 1994, from Janie Marsh Boutwell,
Lessor, to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 807 of the
Official Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated October 20, 1994, from Susan Garvey Evans,
Lessor to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 809 of the
Official Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated October 20, 1994, from Henrietta Elaine Garvey
Jackson, Lessor, to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 811
of the Official Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated October 20, 1994, from Tina Garvey Denison,
Lessor, to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 813 of the
Official Records of Polk County, Texas.





                                       27
<PAGE>   37
Oil, Gas and Mineral Lease dated October 7, 1994, from Frank M. Siler, Lessor,
to Lobo Energy, Inc., Lessee, recorded in Volume 972, Page 815 of the Official
Records of Polk County, Texas.

Oil, Gas and Mineral Lease from Black Stone Minerals, dated August 25, 1994,
Memorandum of Oil and Gas Lease, recorded in Volume 947, Page 188, Official
Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Robert F. Mathews, et ux to
Saratoga Resources, Inc., recorded in Volume 975, Page 454 of the Official
Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 11, 1995, from Louis Bond Hughes, as
Independent Executor of the Estate of Emery H.  Hughes, deceased, to Saratoga
Resources, Inc., recorded in Volume 976, Page 849 of the Official Records of
Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995 from Ann W. Childs to Saratoga
Resources, Inc., recorded in Volume 975, Page 450 of the Official Public
Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Richard Allen Williams, et
ux to Saratoga Resources, Inc., recorded in Volume 975, Page 464 of the
Official Public Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Fain W. Phenicie  to
Saratoga Resources, Inc., recorded in Volume 975, Page 469 of the Official
Public Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 8, 1995, from Diane Elaine Garvey
McFarland to Saratoga Resources, Inc., recorded in Volume 975, Page 473 of the
Deed Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Jennie Mathews, Trustee and
Saratoga Resources, Inc., recorded in Volume 975, Page 477 of the Official
Public Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Fain M. Williams , et vir
to Saratoga Resources, Inc., recorded in Volume 975, Page 481 of the Official
Public Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated May 17, 1995, from Gretchen W. Izett to
Saratoga Resources, Inc., recorded in Volume 975, Page 485 of the Official
Public Records of Polk County, Texas.

Oil, Gas and Mineral Lease dated June 1, 1995, from Coyladene C. McKean to
Saratoga Resources, Inc., recorded in Volume 979, Page 204 of the Deed Records
of Polk County, Texas.



MOORE'S ORCHARD FIELD


Oil and Gas Lease, as amended, dated September 23, 1924, between John M. Moore,
et al, as Lessor, and Gulf Production Company, as Lessee, and recorded in
Volume 102, Page 516-519 of Deed Records of Fort Bend County, Texas, INSOFAR
AND ONLY INSOFAR as said lease covers leasehold rights from the surface down to
the stratigraphic equivalent of 8,490 feet in 40.0 acres of land, more or less,
around the Saratoga Resources - J. M. MOORE WELL NO. 7 located in the Heirs of
Leonard Burknapp Survey,





                                       28
<PAGE>   38
A-109, and more particularly described in that certain Assignment and Agreement
effective as of December 16, 1993, by and between Chevron U.S.A. Inc. and
Saratoga Resources, Inc. and INSOFAR ONLY as such leasehold rights have not
been previously assigned by Assignor.

Oil and Gas Lease, as amended, dated September 23, 1924, between John M. Moore,
et al, as Lessor, and Gulf Production Company, as Lessee, and recorded in
Volume 102, Page 516-519 of Deed Records of Fort Bend County, Texas INSOFAR AND
ONLY INSOFAR as said lease covers leasehold rights from the surface down to the
bottom of the EY-2A sand which sand is found at 7,962 feet in the Lobo
Resources, Ltd. - J. M. MOORE #1 WELL located 825 feet FSL and 790 FEL of the
W. T. Lightfoot Survey, A-283, Fort Bend County, Texas, in and under 40.0 acres
of land, more or less, which said 40 acres of land is more or less, and more
particularly described in that certain Assignment and Agreement effective as of
November 2, 1995, by and between Chevron U.S.A., Inc. and Saratoga Resources,
Inc. and INSOFAR ONLY as such leasehold rights have not been previously
assigned by Assignor.


                                 ROBINSON FIELD
                             FITZSIMMONS NO. 1 WELL
                              DUVAL COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .1562500                                      .1171900

                                       
LEASE DESCRIPTION

The following described Oil, Gas and Mineral Leases:

         (1)     Oil and Gas Lease dated August 10, 1992, by and between W.
Dayton Hutchinson, et al, as Lessors, and James H. Hada, as Lessee, and
recorded in Volume 136 at Page 646 of the Official Records of Duval County,
Texas; and

         (2)     Oil and Gas Lease dated August 10, 1992, by and between
Patricia Fitzsimmons Brimhall and Arthur A.  Brimhall, as Lessors, and James H.
Hada, as Lessee, and recorded in Volume 136 at Page 676 of the Official Records
of Duval County, Texas.

         INSOFAR as said leases cover the following described lands:

         All of Section 295, Abstract 30, Certificate No. 958, A. B. & M.
         Original Grantee, Duval County, Texas, limited to depths between the
         surface and down to 6,500 feet.





                                       29
<PAGE>   39

                           BOOTH RANCH (OLMOS) FIELD
                           MARIA BARREDA NO. 1-A WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

             .3692554                                       .2954044


LEASE DESCRIPTION

That certain Oil, Gas and Mineral Lease dated February 22, 1972, by and between
Maria Estella Barreda, a femme sole, Maria Natalie Barreda de Montemayor, a
widow, and Maria Ana Real Estate, Ltd., individually and as Agents for the
State of Texas, as Lessors, and Reese M. Rowling, as Lessee, which lease is
recorded in Volume 420 at page 161 of the Deed Records of Webb County, Texas,
INSOFAR as said lease covers the North half of Survey No. 36, in the name of
M.G. De Garza, Original Grantee, Abstract No. 2731 in Webb County, Texas, more
fully described as:

         Tract 1:  160 acres of land out of the North part of Survey No. 36,
         Abstract No. 2731, having as its Northwest and Northeast sides the
         Northwest and Northeast sides of said Survey No. 36 and having as its
         Southwest side a line parallel to and 2640 feet from said Northeast
         boundary line and having as its Southeast side a line parallel to and
         2640 feet from said Northwest boundary line, SAVE and EXCEPT any part
         of said 160 acre tract which may be located in the South half of said
         Survey No. 36.

         Tract 2:  The West half of the North half of Survey No. 36, Abstract
         No. 2731, SAVE and EXCEPT any portion thereof which may be located
         within the bounds of Tract 1 described above.



                            BOOTH RANCH (OLMOS FIELD
                          J. R. SAUNDERS NO. 1-B WELL
                               WEBB COUNTY, TEXAS


              INTEREST                                      INTEREST
              --------                                      --------

             .53198620                                     .42558896


LEASE DESCRIPTION

That certain Oil, Gas and Mineral Lease dated February 4, 1972, by and between
J. R. Saunders, Claudine Saunders Eisenhauer and husband, Milton Eisenhauer, as
Lessors, and Reese M. Rowling, as Lessee, which lease in recorded in Volume
418, Page 74 of the Deed Records of Webb County, Texas INSOFAR as said lease
covers the following described lands:

         322 acres of land, more or less, being all of Survey No. 38, in the
         name of M. Garza, Certificate No.  8115, Abstract No. 2865, sold to R.
         W. Roberson on September 15, 1911 and patented to R. S. and H. L.
         Roberson by Patent dated June 14, 1940, recorded in Volume 163, Page 3
         of the deed Records of Webb County, Texas, SAVE AND EXCEPT the
         following described to tracts of land:





                                       30
<PAGE>   40
         Tract 1

         160 acres of land, more or less, out of the East part of Survey No.
         38, said 160 acre tract being described as a rectangle commencing at a
         point in the Northeast boundary line of said Survey No. 38, which
         point is 2300 feet from the intersection of the Northeast side and
         Northwest side of said Survey No. 38.  From this point of beginning

THENCE, approximately 2700 feet Southeasterly along said Northeast side of
Survey No. 38 to the intersection of the Northeast side of Survey No. 38 and
the Southeast side of Survey No. 38;

THENCE, in a Southwesterly direction along the Southeast side of Survey No. 38
for a distance of 2851 feet;

THENCE, in a Northwesterly direction and parallel to the Northeast side of
Survey No. 38 for a distance of approximately 2700 feet;

THENCE, in a Northeasterly direction and parallel to the Southeast side of
Survey 38 for a distance of 2581 feet and back to the PLACE OF BEGINNING.

         Tract 2

         160 acres of land, more or less, out of the north part of Survey No.
         38, having as its northwest and northeast boundaries the northwest and
         northeast boundaries of Survey No. 38, and having as its southwest
         boundary a line parallel to and 3030 feet from said northeast boundary
         line, and having as its southeast boundary a line parallel to and 2300
         feet from said northwest boundary line.



                           BOOTH RANCH (OLMOS) FIELD
                           J. R. SAUNDERS NO. 1 WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .3692554                                      .2954044

LEASE DESCRIPTION

         That certain Oil, Gas and Mineral lease dated February 4, 1972, by and
between J. R. Saunders, Claudine Saunders Eisenhauer and husband, Milton
Eisenhauer, as Lessors, and Reese M. Rowling, as Lessee, which lease in
recorded in Volume 418, Page 74 of the Deed Records of Webb County, Texas
INSOFAR as said lease covers the following described lands:

         322 acres of land, more or less, being all of Survey No. 38, in the
         name of M. Garza, Certificate No.  8115, Abstract No. 2865, sold to R.
         W. Robertson on September 15, 1911 and patented to R. S. and H. L.
         Robertson by Patent dated June 14, 1940, recorded in Volume 163, Page
         3 of the deed Records of Webb County, Texas, SAVE AND EXCEPT the
         following described to tracts of land:

         Tract 1

         160 acres of land, more or less, out of the East part of Survey No.
         38, said 160 acre tract being described as a rectangle commencing at a
         point in the Northeast boundary line of said Survey No. 38, which
         point is 2300 feet





                                       31
<PAGE>   41
         from the intersection of the Northeast side and Northwest side of said
         Survey No. 38.  From this point of beginning

THENCE, approximately 2700 feet Southeasterly along said Northeast side of
Survey No. 38 to the intersection of the Northeast side of Survey No. 38 and
the Southeast side of Survey No. 38;

THENCE, in a Southwesterly direction along the Southeast side of Survey No. 38
for a distance of 2851 feet;

THENCE, in a Northwesterly direction and parallel to the Northeast side of
Survey No. 38 for a distance of approximately 2700 feet;

THENCE, in a Northeasterly direction and parallel to the Southeast side of
Survey 38 for a distance of 2581 feet and back to the PLACE OF BEGINNING.



                           BOOTH RANCH (OLMOS) FIELD
                           J. R. SAUNDERS NO. 2 WELL
                               WEBB COUNTY, TEXAS


              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .3156375                                      .2525120

LEASE DESCRIPTION

         That certain Oil, Gas and Mineral Lease dated February 4, 1972, by and
between J. R. Saunders, Claudine Saunders Eisenhauer and husband, Milton
Eisenhauer, as Lessors, and Reese M. Rowling, as Lessee, which lease in
recorded in Volume 418, Page 74 of the Deed Records of Webb County, Texas
INSOFAR as said lease covers the following described lands:

         322 acres of land, more or less, being all of Survey No. 38, in the
         name of M. Garza, Certificate No.  8115, Abstract No. 2865, sold to R.
         W. Robertson on September 15, 1911 and patented to R. S. and H. L.
         Robertson by Patent dated June 14, 1940, recorded in Volume 163, Page
         3 of the deed Records of Webb County, Texas, INSOFAR as the following
         described tract of land:

         160 acres of land, more or less, out of the north part of Survey No.
         38, having as its northwest and northeast sides the northwest and
         northeast sides of Survey No. 38, and having as its southwest side a
         line parallel to and 3030 feet from said northeast boundary line, and
         having as its southeast side a line parallel to and 2300 fee from said
         northwest boundary line.





                                       32
<PAGE>   42

                           BOOTH RANCH (OLMOS) FIELD
                        SAUNDERS-EISENHAUER  NO. 1 WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .5546542                              .44372336

LEASE DESCRIPTION

That certain Oil, Gas and Mineral lease dated February 4, 1972, by and between
Claudine Saunders Eisenhauer, joined by her husband, Milton Eisenhauer,
Individually and as Agent for the State of Texas, as Lessors, and Reese M.
Rowling, as Lessee, which lease covers the R. W. Robertson Survey No. 35,
Abstract No. 2784, and is recorded in Volume 418, Page 83 of the Deed Records
of Webb County, Texas, SAVE AND EXCEPT the following described 160 acre tract
of land, to wit:

         160 acres of land in the form of a square out of the most westerly 
         corner of Survey No. 35, each side thereof being 2640 feet in length, 
         and being bounded on the northwest and southwest by the northwest and 
         southwest boundary lines of Survey No. 35, respectively; and with the
         northeast boundary being parallel to and 2640 feet from the southwest 
         boundary and with the southeast boundary being parallel to and 2640 
         feet from the northwest boundary.



                           BOOTH RANCH (OLMOS) FIELD
                        SAUNDERS-EISENHAUER  NO. 2 WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .5677189                                      .4541752

LEASE DESCRIPTION

         That certain Oil, Gas and Mineral lease dated February 4, 1972, by and
between Claudine Saunders Eisenhauer, joined by her husband, Milton Eisenhauer,
Individually and as Agent for the State of Texas, as Lessors, and Reese M.
Rowling, as Lessee, which lease covers the R. W. Robertson Survey No. 35,
Abstract No. 2784, and is recorded in Volume 418, Page 83 of the Deed Records
of Webb County, Texas, SAVE AND EXCEPT the following described 160 acre tract
of land, to wit:

         160 acres of land in the form of a square out of the most westerly
         corner of Survey No. 35, each side thereof being 2640 feet in length,
         and being bounded on the northwest and southwest by the northwest and
         southwest boundary lines of Survey No. 35, respectively; and with the
         northeast boundary being parallel to and 2640 feet from the southwest
         boundary and with the southeast boundary being parallel to and 2640
         feet from the northwest boundary.





                                       33
<PAGE>   43
                           LAS TIENDAS (OLMOS) FIELD
                              PALAFOX NO. A-2 WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

             1.00000000                                    .77879062

LEASE DESCRIPTION

Oil and Gas Lease dated March 8, 1982, between Palafox Exploration Company, as
Lessor, and Newton Oil & Gas Corporation, as Lessee, covering 640 acres, more
or less, in Section 48, J. C. Jeffries Survey, Abstract 2793, as recorded in
Volume 690, Page 105-114 of the Deed Records of Webb County, Texas, INSOFAR and
ONLY INSOFAR as the same covers 160 acres of land described more fully as
follows, to-wit:

A tract of land containing 160.0 acres, more or less, out of Section 48, J. C.
Jeffries Survey, Abstract 2793, Webb County, Texas and being more particularly
described as follows, to-wit:

BEGINNING at the northwest corner of Survey 47 and northeast corner of Survey
48 on the south line of Survey 42 for the northeast corner of this tract;

THENCE S. 20degrees 00' E. 2452.42' west line of Survey 47 and east line of
Survey 48 to the southeast corner hereof;

THENCE S. 70degrees 00' W. 4075.83' to the southwest corner of this tract on
the east line of Survey 49 and east line of Survey 48;

THENCE N. 20degrees 00' W. 577.42' with the east line of Survey 49 to the
northeast corner of Survey 49 and westerly northwest corner of Survey 48 for
the westerly northwest corner hereof;

THENCE N. 70degrees 00' E. 1613.89' with the south line of Survey 46, to the
southeast corner of Survey 46, an interior corner of Survey 48 and this tract;

THENCE N. 20degrees 00' W. 1875.00' with the east line of Survey 46 to the
southwest corner of Survey 42 and the northerly northwest corner of Survey 48
and this tract;

THENCE N. 70degrees 00' E. 2461.94' with the south line of Survey 42 to the
place of beginning.


                           LAS TIENDAS (OLMOS) FIELD
                              PALAFOX NO. B-4 WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

             1.0000000                                     .7000000

LEASE DESCRIPTION

That certain Oil and Gas Lease dated February 7, 1972, between Palafox
Exploration Company, as Lessor, and W. L.  Popejoy, as Lessee, covering 153
acres, more or less, in the M. Trevino Survey 89, A-2800, as recorded in Volume
417 Page 358 of the Deed Records of Webb County, Texas and more particularly
described as follows:





                                       34
<PAGE>   44
BEGINNING at the Southeast corner of Survey 88 and most Southerly Southwest
corner of Survey 89 on the North line of Survey 86 for the Southwest corner of
this tract;

THENCE North 20 degrees West with the East line of Survey 88 at 3,541.67' pass
the Northeast corner of Survey 88 and interior corner of Survey 89 and
continuing same course 3,646.37' in all to the Northwest corner of this tract;

THENCE North 70 degrees East 1,827.78' with the West line of Survey 105 and
Survey 104 and the East line of Survey 89 to the Northeast corner of Survey 86
and Southeast corner of Survey 89 and this tract;

THENCE South 70 degrees West 1,827.78' with the North line of Survey 86 and the
south line of Survey 89 to the PLACE OF BEGINNING,

INSOFAR AND ONLY INSOFAR as said lands cover the depths and horizons between
the surface thereof and a depth of 7,046'.



                           LAS TIENDAS (OLMOS) FIELD
                           MARIA BARREDA NO. 1-B WELL
                               WEBB COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .5319862                                     .42558896

LEASE DESCRIPTION

         That certain Oil, Gas and Mineral Lease dated February 22, 1972, by
and between Maria Estella Barreda, a femme sole, Maria Natalie Barreda de
Montemayor, a widow, and Maria Ana real Estate, Ltd., Individually and as
Agents for the State of Texas, as Lessors, and Reese M. Rowling, as Lessee,
which lease is recorded in Volume 420 at page 161 of the deed Records of Webb
County, Texas, INSOFAR as said lease covers the North half of Survey No. 36, in
the name of M. G.  De Garza, Original Grantee, Abstract No. 2731 in Webb
County, Texas, more fully described as:

         Tract 1:  160 acres of land out of the North part of Survey No. 36,
         Abstract No. 2731, having as its Northwest and Northeast sides the
         Northwest and Northeast sides of said Survey No. 36 and having as its
         Southwest side a line parallel to and 2640 feet from said Northeast
         boundary line and having as its Southeast side a line parallel to and
         2640 feet from said Northwest boundary line, SAVE and EXCEPT any part
         of said 160 acre tract which may be located in the South half of said
         Survey No. 36.

         Tract 2:  The West half of the North half of Survey No. 36, Abstract
         No. 2731, SAVE and EXCEPT any portion thereof which may be located
         within the bounds of Tract 1 described above.





                          MARTIN RANCH (HOCKLEY) FIELD
                          HOFFMAN UNIT NOS. 1 & 2 WELL





                                       35
<PAGE>   45
                              DUVAL COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .5100000                                      .3797500


LEASE DESCRIPTION

Oil & Gas Lease dated February 23, 1987, by and between Harold Hoffman,
Margaret Hoffman Haegelin, Lillian Hoffman Stewart, Rosemary Hoffman Skaggs and
W. K. Hoffman, Jr., all individually and as Attorney-In-Fact for Barbara
Haegelin Landrum, Bernard J. Haegelin, Harold Joe Hoffman, Jr., James Michael
Luby, Ellen Luby Macklin and Mary Luby Hansen, Lessors, and Hunter Petroleum,
Inc., as Lessee, recorded in Volume 54, Page 672, et seq., of the Official
Records of Duval County, Texas covering 320 acres of land, more or less,
located in the S.A. & M.G.R.R., Survey No. 109, A-539, approximately 4.5 miles
SSW of San Diego, Duval County, Texas.



                          MARTIN RANCH (HOCKLEY) FIELD
                         HOFFMAN NOS. 2, 4 AND 5 WELLS
                              DUVAL COUNTY, TEXAS

              WORKING                                     NET REVENUE
              INTEREST                                      INTEREST
              --------                                      --------

              .5500000                                      .4070000



LEASE DESCRIPTION

Oil & Gas Lease dated February 23, 1987, by and between Harold Hoffman,
Margaret Hoffman Haegelin, Lillian Hoffman Stewart, Rosemary Hoffman Skaggs and
W. K. Hoffman, Jr., all individually and as Attorneys-In-Fact for Barbara
Haegelin Landrum, Bernard J. Haegelin, Harold Joe Hoffman, Jr., James Michael
Luby, Ellen Luby Macklin and Mary Luby Hansen, Lessors, and Hunter Petroleum,
Inc., as Lessee, recorded in Volume 54, Page 672, et seq., of the Official
Records of Duval County, Texas covering 320 acres of land, more or less,
located in the S.A. & M.G.R.R., Survey No. 109, A-539, approximately 5 miles
SSW of San Diego, Duval County, Texas


                                 HEMPHILL FIELD
                              SABINE COUNTY, TEXAS


The following oil, gas and mineral leases:

(1)        Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and United Oil & Minerals, Inc., as Lessee,
           covering Parcel No. 9407102 TX, being Tract S-2q-1, Parcel #2,
           containing 363.00 acres of land, more or less, out of and a part of
           the Henry Nichols Survey, Abstract 46.

(2)        Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and United Oil & Minerals, Inc., as Lessee,
           covering Parcel No. 9407101 TX, being Tract S-2q-1,





                                       36
<PAGE>   46
           Parcel #1, containing 220.00 acres of land, more or less, out of and
           a part of the Henry Johnson Survey, Abstract 401.

(3)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 460.393 acres, more or less, located in the J. W.
           Caldwell Survey, A- 296, C. W. Conner Survey, A-262 and Walter
           Hughes Survey, A-24 as further described in said lease, recorded in
           Volume 47, Page 462.

(4)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 399.683 acres, more or less, located in the William
           Arledge Survey, A- 259, Jesse Lowe Survey, A-147 and the Eli Lowe
           Survey, A-34, and the H.E. & W.T. R.R. Survey, A-269, as further
           described in said lease, recorded in Volume 47, Page 479.

(5)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 332.873 acres, more or less, located in the Jesse
           Lowe Survey, A-147, the Eli Lowe Survey, A-34, and the J. A. Watson
           Survey, A-477, as further described in said lease, recorded in
           Volume 47, Page 496.

(6)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 453.534 acres, more or less, located in the William
           Arledge Survey, A- 259, and the J. F. Clark Survey, A-380, as
           further described in said lease, recorded in Volume 47, Page 513.

(7)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 319.014 acres, more or less, located in the William
           Arledge Survey, A- 259, H.E. & W.T. R.R. Co. Survey A-269, Jesse
           Lowe Survey, A-147, and the Eli Low Survey, A-34, as further
           described in said lease, recorded in Volume 47, Page 530.

(8)        Oil, Gas and Mineral Lease dated August 1, 1994 by and between
           Temple-Inland F.P.C., as Lessor, and Saratoga Resources, Inc., as
           Lessee, covering 502.655 acres, more or less, located in the J. W.
           Caldwell Survey, A- 296, William Arledge Survey, A-259, and the
           Walter Hughes Survey, A-24, as further described in said lease,
           recorded in Volume 47, Page 547.

(9)        Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and Baker Exploration Co., et al, as Lessee,
           covering a portion of Tract S-2k-I, identified as Parcel #13
           containing 913.77 acres of land, more or less, being part of the
           Walter Hughes Survey, A-24, recorded in Volume 49, Page 163.

(10)       Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and Baker Exploration Co., et al, as Lessee,
           covering a portion of Tract S-2k-II, identified as Parcel #2
           containing 694.38 acres of land, more or less, embracing in part the
           Eli Lowe Survey, A-34, and the William M. Arledge Survey, A-259,
           recorded in Volume 49, Page 170.

(11)       Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and Baker Exploration Co., et al, as Lessee,
           covering a portion of Tract S-2k-II, identified as Parcel #4
           containing 548.62 acres of land, more or less, embracing in whole
           the H.E. & W.T. R.R. Survey No. 1, A-269.

(12)       Oil, Gas and Mineral Lease dated September 1, 1994 by and between
           United States, Department of the Interior, Bureau of Land
           Management, as Lessor and Baker Exploration Co., et al, as Lessee,
           covering all of Tract S-2k- XI, containing 595.32





                                       37
<PAGE>   47
           acres of land, more or less, embracing in whole the Hugh Milligan
           Patented Survey, A-161.

(13)       Oil, Gas and Mineral Lease dated March 1, 1992 by and between United
           States, Department of the Interior, Bureau of Land Management, as
           Lessor and John F. Hafner & Associates, as Lessee, being all that
           certain Tract S-2o or parcel of land containing 110.00 acres, more
           or less, lying and being in Sabine County, Texas, on the waters of
           Housen Bayou, a tributary of Sabine River, lying entirely within the
           John Haley Survey, A-20, dated February 25, 1835, and conveyed to
           the United States by Temple Lumber Company in a deed dated January
           9, 1936, and recorded in Volume 39, Page 293-387.

(14)       Oil, Gas and Mineral Lease dated March 1, 1992 by and between United
           States, Department of the Interior, Bureau of Land Management, as
           Lessor and John F. Hafner & Associates, as Lessee, being all that
           certain Tract S-2N or parcel of land containing 142.00 acres, more
           or less, lying and being in Sabine County, Texas, on the waters of
           Housen Bayou, a tributary of Sabine River, lying entirely within the
           Hamp Bush Survey, A-307, dated January 17, 1885, and conveyed to the
           United States by Temple Lumber Company in a deed dated January 9,
           1936, and recorded in Volume 39, Page 293-387.



                              TOMAS (OLMOS) FIELD
                                 PALAFOX WELLS
                               WEBB COUNTY, TEXAS


                               LEASE DESCRIPTION



The following oil, gas and mineral leases:

(1)       Oil, Gas and Mineral Lease dated February 14, 1972, by and between
          PALOFOX EXPLORATION COMPANY invidivually and as agent for the STATE
          OF TEXAS, as Lessor, and W. L. POPEJOY, as Lessee, which lease is
          recorded in Volume 418 at Page 330 of the Deed Records of Webb
          County, Texas.

(2)       Oil, Gas and Mineral Lease dated February 14, 1972, by and between
          PALOFOX EXPLORATION COMPANY invidivually and as agent for the STATE
          OF TEXAS,

          as Lessor, and W. L. POPEJOY, as Lessee, which lease is recorded in
          Volume 418 at Page 334 of the Deed Records of Webb County, Texas; and

(3)       Oil, Gas and Mineral Lease dated February 14, 1972, by and between
          PALOFOX EXPLORATION COMPANY invidivually and as agent for the STATE
          OF TEXAS, as Lessor, and W. L. POPEJOY, as Lessee, which lease is
          recorded in Volume 418 at Page 338 of the Deed Records of Webb
          County, Texas.

Palafox #1
Insofar as the above-described oil, gas and mineral leases are located in
Section 43, L.T. & B Survey, A-233, Webb County, Texas.
    Working Interest   .8665690          Net Revenue Interest   .73225081


Palafox #2
Insofar as the above-described oil, gas and mineral leases are located in
Section 46, P. Bustamente Survey, A-2706, Webb County, Texas.
     Working Interest   .9000000          Net Revenue Interest   .7605000





                                       38
<PAGE>   48
Palafox #3
Insofar as the above-described oil, gas and mineral leases are located in
Section 45, S. Bustamente Survey, A-2707, Webb County, Texas.
     Working Interest   .9000000          Net Revenue Interest   .7605000

Palafox #4
Insofar as the above-described oil, gas and mineral leases are located in
Section 44, Z. Villarreal Survey, A-2805, Webb County, Texas.
     Working Interest   .9000000          Net Revenue Interest   .7605000

Palafox #5
Insofar as the above-described oil, gas and mineral leases are located in
Section 7, L.T. & B. Survey, A-2333, Webb County, Texas.
     Working Interest   .9000000          Net Revenue Interest   .7605000

Palafox #7
Insofar as the above-described oil, gas and mineral leases are located in
Section 8, L.T. & B. Survey, A-2334, Webb County, Texas.
     Working Interest   .9000000          Net Revenue Interest   .7605000

Palafox Nos. 3I and 7

Oil, Gas and Mineral Lease dated October 23, 1967, by and between Palafox
Exploration Company as Lessor, and J. Donald Jordan as Lessee, recorded in
Volume 357, Page 371, Webb County, Texas, and more fully described in said
lease.
     Working Interest   .1250000          Net Revenue Interest   .0937500


ANGELINA COUNTY, TEXAS


<TABLE>
<CAPTION>
Mobil
Leases                            Volume     Page           Lessor
- ------                            ------     ----           ------
<S>                <C>            <C>        <C>            <C>
TX-52664                          791        480            Julianne Flournoy Johnson et vir.

TX-52665                          791        508            Ruby Pitre Flournoy et al.

TX-52668A                         791        683            Thomas G. Flournoy et al.

                   The assignment in this lease is limited to Tracts one, two, nine, and eleven.  The    
                   assignment does not include Tracts three, four, five, six, seven, and eight of the
                   lease.

TX-52668B                         791        678            Robert Flournoy et al.


                   The assignment in this lease is limited to Tracts one, two, four, and five.  The      
                   assignment does not include Tract three of the lease.

TX-52674                          791        692            Don M. Flournoy et ux.

                   The assignment in this lease is limited to Tract one and does not include Tracts      
                   two and three of the lease.
</TABLE>





                                       39
<PAGE>   49

ALL OTHER RIGHT, TITLE AND INTEREST OF ASSIGNOR OF WHATEVER KIND OF CHARACTER
ASSOCIATED WTH THE ABOVE LISTED LEASES (WHETHER NOW OWNED OR HEREAFTER ACQUIRED
BY OPERATION OF LAW OR OTHERWISE) IN AND TO (I) THE OIL, GAS AND/OR MINERAL
LEASES OR OTHER AGREEMENTS DESCRIBED HEREIN, (II) THE LANDS DESCRIBED OR
REFERRED TO HEREIN (OR DESCRIBED IN ANY OF THE INSTRUMENTS DESCRIBED OR
REFERRED TO HEREIN), WITHOUT REGARD TO ANY LIMITATIONS AS TO SPECIFIC LANDS OR
DEPTHS THAT MAY BE SET FORTH HEREIN, OR IN ANY OF THE LEASES OR OTHER
AGREEMENTS DESCRIBED HEREIN.  INCLUDING BUT NOT LIMITED TO ALL RIGHTS TO SALT
WATER INJECTION WELLS, AND WATER SUPPLY WELLS OR ASSOCIATED WITH THESE LANDS,
ALL WELL EQUIPMENT, ALL PRODUCTION RELATED EQUIPMENT AND ALL PIPELINES AND
RIGHTS ASSOCIATED THEREWITH.





                                       40

<PAGE>   1
                                                                   EXHIBIT 10.20


                    ASSIGNMENT, CONVEYANCE AND BILL OF SALE


         For and in consideration of Ten Dollars ($10.00) and other good and
valuable considerations, the receipt and sufficiency of which are hereby
acknowledged, Saratoga Resources, Inc., a Texas corporation ("Saratoga Texas"),
Lobo Energy, Inc., a Texas corporation ("Lobo Energy"), and Lobo Operating,
Inc., a Texas corporation ("Lobo Operating"); Saratoga Texas, Lobo Energy and
Lobo Operating are hereinafter individually and collectively called
"Assignors"), each having an address at 1155 Dairy Ashford, Suite 600, Houston,
Texas 77079, do hereby sell, assign, convey, and transfer all of Assignors'
right, title, estate and interest in and to the following rights, assets,
properties and interests, and all rights attendant thereto (hereinafter
individually and collectively referred to as the "Interests");

         (a)     the oil and/or gas wells described at Exhibit A attached
                 hereto (hereinafter individually and collectively called the
                 "Wells");

         (b)     the oil, gas and minerals underlying, and the oil, gas and
                 mineral leases, pooling agreements, and pooling, unitization,
                 communitization and similar orders of governmental bodies or
                 authorities covering, all or any portion of the lands
                 described at Exhibit A and/or lands, spaced, pooled and/or
                 unitized with such lands (hereinafter individually and
                 collectively called the "Leases");

         (c)     the lands described in the Leases and the lands spaced, pooled
                 and/or unitized therewith (hereinafter individually and
                 collectively called the "Lands");

         (d)     the salt water injection wells and water supply wells located
                 at the Lands (hereinafter individually and collectively called
                 the "Disposal and Supply Wells"), and the properties (real,
                 personal or fixtures) situated at, appurtenant to, or used in
                 connection with, the operation of the Wells and/or the
                 Disposal and Supply Wells, including, without limitation,
                 flowlines, piping, pipelines, gathering systems, surface
                 production equipment, supplies, materials, equipment, tools,
                 injection facilities, compression facilities, tanks,
                 compressors, heater treaters and pumping units (hereinafter
                 individually and collectively called the "Properties");

         (e)     all agreements, contracts, licenses, files, records, maps,
                 logs, all seismic data and information at or in the vicinity
                 of the Lands, except as specifically excluded at Exhibit B
                 attached hereto, computer data, rights-of-way, permits,
                 authorizations, orders and easements, but only insofar as same
                 cover and pertain to the Leases, the Wells, the Disposal and
                 Supply Wells, the Lands and/or the Properties (hereinafter
                 individually and collectively called the "Agreements");

         (f)     all filing cabinets, filing storage containers, furniture,
                 equipment, vehicles and fixtures in Assignors' possession or
                 under Assignors' control which are not specifically excluded
                 at Exhibit B; and
<PAGE>   2
         (g)     all accounts receivable, security deposits, prepayments,
                 refunds, rights to refunds, and rebates in favor of, owing to,
                 or possessed or controlled by Assignors, whether or not
                 attributable to the assets and properties described at clauses
                 (a) - (f) above (hereinafter individually and collectively
                 called the "Accounts")

unto PrimeEnergy Corporation, a Delaware corporation (hereinafter called
"Assignee").

         This Assignment, Conveyance and Bill of Sale is made without warranty
or representation of any kind, express or implied.

         This Assignment, Conveyance and Bill of Sale is being delivered by
Assignors to further effectuate the purposes and effect of that certain
Compromise and Settlement Agreement dated this even date between Assignors,
Internationale Nederlanden (U.S.) Capital Corporation and others. Assignors, as
and when reasonably requested by Assignee (or its successors and assigns), will
properly execute, acknowledge and deliver all such additional deeds,
assignments, division orders, transfer orders, letters-in-lieu of transfer
orders, bills of sale, instruments, files, documents, releases, records, logs,
computer discs and other computer data in any Assignors' possession or under
its control in order to more effectively convey and transfer the Interests to
Assignee.  Assignors will assist Assignee in the collection or reduction to
possession of the Interests.

         THAT PORTION OF THE INTERESTS WHICH CONSISTS OF PERSONAL PROPERTY,
MACHINERY, FIXTURES, CASING, EQUIPMENT, PIPES, TUBING, AND MATERIALS IS HEREBY
SOLD, ASSIGNED, AND ACCEPTED BY ASSIGNEE IN THEIR "WHERE IS, AS IS" CONDITION,
WITHOUT ANY WARRANTIES WHATSOEVER, EXPRESS, IMPLIED OR STATUTORY, INCLUDING,
WITHOUT LIMITATION, WARRANTIES OF MARKETABILITY, QUALITY, CONDITION,
MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE OR USE, ALL OF WHICH
ARE EXPRESSLY DISCLAIMED.  TO THE EXTENT REQUIRED TO BE OPERATIVE, THE
DISCLAIMERS OF CERTAIN WARRANTIES CONTAINED IN THIS PORTION OF THIS ASSIGNMENT
ARE "CONSPICUOUS" DISCLAIMERS FOR THE PURPOSE OF ANY APPLICABLE LAW, RULE OR
ORDER.

         To the extent transferable, Assignors convey to Assignee the benefit
of, and the right to enforce, all covenants and warranties that Assignors are
entitled to enforce with respect to the Interests, including full substitution
and subrogation of all prior rights in warranty, and the benefit of and the
right to enforce all rights accruing under statutes of limitation or
prescription.

         TO HAVE AND TO HOLD the Interests unto Assignee, Assignee's successors
and assigns, forever.

         This Assignment, Conveyance and Bill of Sale may be executed in any
number of counterparts, each of which shall be considered an original for all
purposes.  This Assignment, Conveyance and Bill of Sale is being executed in
multiple originals, all of which are identical, except that, to facilitate
recordation, counterparts hereof which are being recorded may contain only
those portions of Exhibit A and Exhibit B which include Interests located in
(or deemed located in, or otherwise subject to the requirements and/or 
protections of) the recording jurisdiction in which the 




                                      2
<PAGE>   3
counterpart is being recorded. All of such counterparts together shall
constitute one and the same instrument.

         This Assignment, Conveyance and Bill of Sale is executed and delivered
as of this ___ day of May, 1996, but shall be effective for all purposes as of
January 1, 1996.


                                        "ASSIGNORS"
                                        
                                        "SARATOGA TEXAS"
                                        
ATTEST:`                                SARATOGA RESOURCES, INC.
                                        
                                        
                                        By:                                    
- ----------------------------------          -----------------------------------
  Assistant Secretary                        Thomas F. Cooke
                                             Chairman and Chief Operating 
                                             Officer
                                        
                                        
                                        "LOBO ENERGY"
                                        
                                        LOBO ENERGY, INC.
ATTEST:                                 
                                        
                                        
                                        By:                                    
- ----------------------------------          -----------------------------------
  Assistant Secretary                        Thomas F. Cooke
                                             Chairman and Chief Operating 
                                             Officer
                                        
                                        
                                        "LOBO OPERATING"
                                        
                                        LOBO OPERATING, INC.
                                        
ATTEST:                                 
                                        
                                        
                                        By:                                    
- ----------------------------------          -----------------------------------
  Assistant Secretary                        Thomas F. Cooke
                                             Chairman and Chief Operating 
                                             Officer





                                       3
<PAGE>   4
STATE OF TEXAS            )
                          )
COUNTY OF HARRIS          )


         This instrument was acknowledged before me on May ___, 1996, by Thomas
F. Cooke, as  Chairman and Chief Operating Officer of Saratoga Resources, Inc.,
a Texas corporation, on behalf of such corporation.


         (Seal)                                                               
                              ------------------------------------------------
                              Notary Public in and for the State of           
                                                                    ----------
                              My Commission Expires:                          
                                                      ------------------------



STATE OF TEXAS            )
                          )
COUNTY OF HARRIS          )


         This instrument was acknowledged before me on May ___, 1996, by Thomas
F. Cooke, as  Chairman and Chief Operating Officer of Lobo Energy, Inc., a
Texas corporation, on behalf of such corporation.


         (Seal)                                                               
                              ------------------------------------------------
                              Notary Public in and for the State of           
                                                                    ----------
                              My Commission Expires:                          
                                                      ------------------------



STATE OF TEXAS            )
                          )
COUNTY OF HARRIS          )


         This instrument was acknowledged before me on May ___, 1996, by Thomas
F. Cooke, as  Chairman and Chief Operating Officer of Lobo Operating, Inc., a
Texas corporation, on behalf of such corporation.


         (Seal)                                                               
                              ------------------------------------------------
                              Notary Public in and for the State of           
                                                                    ----------
                              My Commission Expires:                          
                                                      ------------------------





                                       4
<PAGE>   5
                                   EXHIBIT A

         Exhibit A to this Exhibit 10.20 has been omitted as the Exhibit A to
Exhibit 10.19 filed herein is the same and reference is here made to that
Exhibit 10.19 and the Exhibit A included therein.
<PAGE>   6
                                   EXHIBIT B


<TABLE>
<CAPTION>
1)       WELLS/LEASES           OPERATOR          COUNTY/PARISH            FIELD                STATE
         ------------           --------          -------------            -----                -----
         <S>                    <C>               <C>                      <C>                  <C>
         Unit Leases            Lobo              Claiborne Parish         Southwest Lisbon     Louisiana

</TABLE>

2)       All filing cabinets, filing storage cabinets, furniture, equipment,
         and fixtures in Assignors' possession or under Assignors' control
         other than those presently used to store the Agreements as defined in
         clause (e) of this Assignment, Conveyance and Bill of Sale, and all
         vehicles which are not used directly in the operation of the Wells,
         Leases, Lands and Properties as those terms are defined in clauses (a)
         through (d) of this Assignment, Conveyance and Bill of Sale; provided
         however, all desks, chairs, credenzas and bookshelves in the geology,
         production, accounting and land departments shall not be considered
         hereunder as Excluded Assets.

3)       All accounts receivable, security deposits, prepayments, refunds,
         rights to refunds, and rebates in favor of, owing to, or possessed or
         controlled by Assignor relating to the Kaminski Partnership 90-I
         receivable.

4)       All Aries and Artesia software packages, licenses and related computer
         software and hardware.

5)       All proprietary seismic data and information which are owned or are
         the subject of specific license agreements with Assignor and where
         such license agreements specifically restrict the sale or assignment
         thereof; provided, however, that Assignor will provide access to such
         seismic data and information to the extent it relates to the Wells,
         Leases, Lands and Properties.

6)       All tax attributes, other than tax refunds or present claims for tax
         refunds.

7)       All stock of all direct and indirect stock of subsidiaries (i.e.,
         Saratoga Resources, Inc., Lobo Energy, Inc., and Lobo Operating, Inc.,
         Texas corporations.


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