CARRIZO OIL & GAS INC
8-K, 1998-12-28
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


       Date of Report (date of earliest event reported): December 11, 1998


                             CARRIZO OIL & GAS, INC.
             (Exact name of registrant as specified in its charter)


            TEXAS                       0-22915              76-0415919
(State or other jurisdiction of      (Commission           (I.R.S. Employer
        incorporation)               File Number)         Identification No.)


                              14811 ST. MARY'S LANE
                                    SUITE 148
                              HOUSTON, TEXAS 77079
              (Address of principal executive offices and zip code)


       Registrant's telephone number, including area code: (281) 496-1352







<PAGE>   2



ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS

                  On December 11, 1998, Carrizo Oil & Gas, Inc., a Texas
corporation (the "Company") completed the acquisition (the "Acquisition") of
certain oil and gas producing properties in Wharton County, Texas, along with
certain rights to participate in certain exploration prospects (primarily in the
Wilcox formation) in Wharton County, Texas and associated rights of access to
certain 2-D and 3-D seismic data and related information and certain other
related assets (collectively, the "Assets") from Hall-Houston Oil Company, a
Texas corporation, Hall-Houston 1996 Exploration and Development Facility
Overriding Royalty Trust, a Texas trust, and Hall-Houston Oil Company Employee
Royalty Trust, a Texas trust (collectively, "Hall-Houston"). The Acquisition was
effected pursuant to an Agreement dated November 20, 1998 by and between the
Company and Hall-Houston (the "Agreement") which is incorporated herein by
reference.

                  The consideration for the Acquisition was $3 million cash,
subject to certain post-closing adjustments as provided in the Agreement
relating to, among other things, oil and gas production from the Assets from an
effective date of October 1, 1998. The $3 million consideration was determined
by negotiations between the Company and Hall-Houston. There was no material
relationship between the Company and Hall-Houston prior to the consummation of
the Acquisition. The source of funds for the Acquisition was the term loan
arrangement entered into between the Company and Compass Bank in September of
1998 (described in the Company's Form 10-Q for the quarterly period ending
September 30, 1998).

                  The Acquisition is not required to be reported under Item
2 of Form 8-K because it does not involve an acquisition of a business that is
"significant" as determined under Regulation S-X 11-01(b) by reference to the
most recently completed annual fiscal year for the Company and the Assets. The
Acquisition is being reported because of its possible significance in relation
to the Company's and the Assets' current fiscal year.

ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

                  (a)      Financial Statements of Business Acquired.

                  In accordance with Item 7(a)(4) of Form 8-K, registrant will
                  file the required financial statements by amendment to this
                  Form 8-K as soon as practicable, but no later than February
                  24, 1999.

                  (b)      Pro Forma Financial Information.

                  In accordance with Item 7(b)(2) of Form 8-K, registrant will
                  file the required financial information by amendment to this
                  Form 8-K as soon as practicable, but no later than February
                  24, 1999.

                  (c)      Exhibits.


                                     Page 2


<PAGE>   3



         2.1      Agreement dated November 20, 1998 by and between the Company 
                  and Hall-Houston.

         *99.1    Limited Guaranty by Douglas A.P. Hamilton for the benefit of 
                  Compass Bank.

         *99.2    Notice of Final Agreement with respect to a term loan from
                  Compass Bank.

         *99.3    Limited Guaranty by Paul B. Loyd, Jr. for the benefit of 
                  Compass Bank.

         *99.4    Limited Guaranty by Steven A. Webster for the benefit of 
                  Compass Bank.

         *99.5    Fourth Agreement to First Amended, Restated, and Combined Loan
                  Agreement by and between the Company and Compass Bank.





























- ------------------------------
*     Incorporated by reference to the Company's Form 10-Q for the quarterly 
      period ending September 30, 1998.

                                     Page 3


<PAGE>   4









                                   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.


                                        CARRIZO OIL & GAS, INC.



                                        By: /s/ S.P. JOHNSON IV
                                           ------------------------------------
                                        Name:   S.P. Johnson IV
                                             ----------------------------------
                                        Title:  President
                                              ---------------------------------


Date:  December 28, 1998


                                     Page 4


<PAGE>   5
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
         EXHIBIT
         NUMBER                             DESCRIPTION
         ------                             -----------
<S>               <C>
         2.1      Agreement dated November 20, 1998 by and between the Company 
                  and Hall-Houston.

         *99.1    Limited Guaranty by Douglas A.P. Hamilton for the benefit of 
                  Compass Bank.

         *99.2    Notice of Final Agreement with respect to a term loan from
                  Compass Bank.

         *99.3    Limited Guaranty by Paul B. Loyd, Jr. for the benefit of 
                  Compass Bank.

         *99.4    Limited Guaranty by Steven A. Webster for the benefit of 
                  Compass Bank.

         *99.5    Fourth Agreement to First Amended, Restated, and Combined Loan
                  Agreement by and between the Company and Compass Bank.

</TABLE>

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

*     Incorporated by reference to the Company's Form 10-Q for the quarterly 
      period ending September 30, 1998.


<PAGE>   1

                                                                     EXHIBIT 2.1



                             CARRIZO OIL & GAS, INC.



14811 ST. MARY'S LANE                                  PHONE: (281) 496-1352
SUITE 148                                              FAX: (281) 496-0884
HOUSTON, TX 77079

                                November 20, 1998



Hall-Houston Oil Company,
Hall-Houston 1996 Exploration and
Development Facility Overriding
Royalty Trust and
Hall-Houston Oil Company Employee
Royalty Trust
Attn: Gary L. Hall
700 Louisiana, Suite 2100
Houston, Texas 77002
FAX: (713) 225-7600

                              Re: Purchase and Sale Agreement - Jones Branch 3D
                                  Seismic Area, Wharton County, Texas

Gentlemen:

         This letter (this "Agreement") sets forth the agreement between
HALL-HOUSTON OIL COMPANY, a corporation organized under the laws of the State of
Texas ("HHOC"), HALL-HOUSTON 1996 EXPLORATION AND DEVELOPMENT FACILITY
OVERRIDING ROYALTY TRUST, a trust created under the laws of the State of Texas
("HH96EDFT"), and HALL-HOUSTON OIL COMPANY EMPLOYEE ROYALTY TRUST, a trust
created under the laws of the State of Texas ("HHOCERT"; HH96EDFT and HHOCERT
being, collectively, the "Trusts"; and the Trusts and HHOC being, collectively,
"Sellers"), as Sellers, the address for each of which for purposes hereof being
as set forth above, and CARRIZO OIL & GAS, INC., a corporation organized under
the laws of the State of Texas ("Purchaser"), as Purchaser, the address for
which for purposes hereof being as set forth above, regarding (a) the purchase
by Purchaser of (i) all of Sellers' right, title and interest (the interest of
each Seller, as to production of oil, gas, and other liquid or gaseous
hydrocarbons ("Hydrocarbons") from each relevant well, being set forth on
Exhibit "A-1" attached hereto and made a part hereof for all purposes) in and to
certain oil and gas leases covering lands located in Wharton County, Texas, as
limited in depth and/or acreage, all as more particularly described in Exhibit
"A" attached hereto and made part hereof for all purposes (collectively, the
"Subject Leases"), together with all of Sellers' right, title, and interest in
and to all Hydrocarbons produced or to be produced under the terms of any of the
Subject Leases on or after the Effective Date, as such term is defined
hereinafter, and (ii) all right, title, and interest of HHOC in and to: (A) all
wells, lease and wellhead equipment, materials, fixtures, facilities, other
personal property, and other movable or immovable property (including,



<PAGE>   2


Hall-Houston Oil Company et al.
November 20, 1998
Page 2



but not limited to, pumping and injection equipment, storage facilities,
pipelines, and treating equipment) located on the lands covered by the Subject
Leases or used directly in connection with the production, treatment or
transportation of Hydrocarbons produced from or allocable to the lands covered
by the Subject Leases, but expressly excluding any automobiles, trucks,
trailers, drilling or workover rigs or other personal property or equipment
temporarily located on such lands (collectively, the "Subject Lease Equipment"),
(B) pipeline rights-of-way and easements and other surface use rights over,
across, and on lands other than the lands covered by the Subject Leases used in
the transportation and marketing of gas produced from or allocable to the
Subject Leases, as more particularly described in Exhibit "B" attached hereto
and made part hereof for all purposes (collectively, the "Subject Easements"),
(C) the pipelines and all meters and other equipment located on the lands
covered by the Subject Easements or used in the operation of such pipelines
(collectively, the "Subject Pipeline Equipment"), and (D) contracts and
agreements (including, but not limited to, production sale agreements, operating
agreements, permits, licenses, rights-of-way, easements, and equipment leases)
relating to the operation of the Subject Leases or the pipelines located on the
Subject Easements, including, but not limited to, those specifically listed in
Exhibit "A" or Exhibit "B" hereto, as the case may be, but only to the extent in
force and effect and relating to the operation of the Subject Leases or the
pipelines located on the Subject Easements and only to the extent assignable by
HHOC (collectively, the "Subject Contracts"and the Subject Leases, the Subject
Lease Equipment, the Subject Easements, the Subject Pipeline Equipment, and the
Subject Contracts being, collectively, the "Subject Interests"), subject, as to
all of the foregoing, to all of the terms and provisions of the leases,
right-of-way deeds, grants of easements, surface use agreements, other
agreements, and encumbrances listed in Exhibit "A" or Exhibit "B" hereto, as the
case may be, and (b) the agreement by HHOC to provide to Purchaser access to all
geological and geophysical information and data, including, but not limited to,
all proprietary 2-D and 3-D seismic data and licenses thereto, together with all
logs, production tests, reports, analyses and information applicable to the
Subject Leases, but only to the extent such access can be provided by HHOC
without violation of any applicable license or other agreement (the "Subject
Data"). The conveyance of the Subject Interests by Sellers to Purchaser is to be
made by way of a conveyance substantially in the form of the Assignment of Oil
and Gas Leases and Overriding Royalty Interests, Right-of-Way Deed, and Bill of
Sale attached hereto as Exhibit "C" and made part hereof for all purposes (the
"Assignment"), in which each of Sellers, individually as to the Subject
Interests conveyed by it and not jointly, shall warrant title against claims
arising by, through or under the relevant Seller, but not otherwise, but with
full right of substitution and subrogation in and too all warranties inuring to
the relevant Seller. The granting to Purchaser of access to the Subject Data by
HHOC is to be made pursuant to the provisions of Section 13 below.




<PAGE>   3


Hall-Houston Oil Company et al.
November 20, 1998
Page 3



         For and in consideration of the mutual promises made in this Agreement
and the benefits to be derived by each of the parties therefrom, Sellers and
Purchaser agree as follows:

         1. AGREEMENT TO SELL AND TO PURCHASE. Sellers agree to sell, and
Purchaser agrees to purchase, the Subject Interests for the consideration and on
the terms and conditions set forth in this Agreement and subject to the
reservation by HHOC of (a) the right of ingress and egress, at its sole risk and
expense, with respect to the lands covered by the Subject Leases for purposes of
operations as to acreage or depths not to be sold to Purchaser hereunder,
provided that such access shall not interfere unduly with Purchaser's operations
on the lands covered by the Subject Leases and HHOC shall bear any additional
cost or expense resulting from operations on such lands by HHOC, and (b) the
right, subject to available capacity therein and at the sole risk and expense of
HHOC, to use the pipelines located on the Subject Easements, free of charge to
HHOC by Purchaser, for the transportation of gas produced from or allocable to
interests of HHOC in such acreage or depths not to be sold to Purchaser and in
oil and gas leases in the "Seismic Area" established pursuant to that certain
Exploration and Lease Acquisition Agreement dated effective November 12, 1996
among HHOC, Horizon Exploration Company (a division of Horizon Resources, Inc.),
and American Energy Partners, Inc. (the "Exploration Agreement"), provided that
the volume of Hydrocarbon production from or allocable to the interest in the
Subject Leases to be acquired by Purchaser to be transported through such
pipelines shall not be reduced or restricted in any manner as a result of such
reservation of available pipeline capacity by HHOC and Purchaser shall have
priority to capacity in such pipelines as needed by Purchaser. WITH RESPECT TO
THE FOREGOING RESERVATIONS BY HHOC, EACH OF HHOC AND PURCHASER SHALL PROTECT,
INDEMNIFY, DEFEND AND HOLD HARMLESS THE OTHER AND THEIR RESPECTIVE SHAREHOLDERS,
DIRECTORS, OFFICERS, TRUSTEES, BENEFICIARIES, EMPLOYEES, AND AGENTS, AND THE
HEIRS, DEVISEES, SUCCESSORS AND ASSIGNS OF ANY OF THE FOREGOING, FROM AND
AGAINST ANY AND ALL CLAIMS, LIABILITIES, DEMANDS, LOSSES, DAMAGES, COSTS,
EXPENSES, COURT COSTS, REASONABLE ATTORNEYS FEES, CAUSES OF ACTION, DEATHS,
PERSONAL INJURIES, ILLNESSES, DISEASES, LITIGATION, JUDGMENTS OR SETTLEMENTS
("CLAIMS") ARISING FROM THE EXERCISE BY HHOC OF ITS RESERVED RIGHTS OR OPERATION
BY PURCHASER OF THE SUBJECT LEASES AND THE PIPELINES LOCATED ON THE LANDS
COVERED BY THE SUBJECT EASEMENTS; PROVIDED, HOWEVER, THAT IN EACH INSTANCE SUCH
INDEMNIFICATION RELATING TO THE OPERATION OR USE OF SUCH PIPELINES SHALL BE
LIMITED TO A PROPORTIONATE SHARE OF THE CLAIMS TO WHICH IT RELATES, SUCH
PROPORTION TO EQUAL THE PROPORTIONATE INTEREST OF THE INDEMNIFYING PARTY IN THE
ENTIRE HYDROCARBON PRODUCTION STREAM BEING TRANSPORTED THROUGH SUCH PIPELINES AT
THE TIME OF THE OCCURRENCE GIVING RISE TO SUCH CLAIM. This Agreement supersedes
any other agreement, whether oral or written, that may exist between the parties
to this Agreement, including, but not limited to, that certain Purchase Letter
dated November 17, 1998 (accepted by HHOC on November 20, 1998) between
Purchaser and HHOC; provided, however, that certain Confidentiality Agreement
dated July 10, 1998 between HHOC and Purchaser shall remain


 
<PAGE>   4
 

Hall-Houston Oil Company et al.
November 20, 1998
Page 4



in place and be fully effective through the closing of the purchase by Purchaser
from Sellers of the Subject Interests (the "Closing"). Upon the Closing, this
Agreement and the Assignment shall constitute the only agreements among the
parties hereto relating to the subject matter hereof and the above-mentioned
Confidentiality Agreement shall be superseded.

         2. CONSIDERATION. The aggregate consideration for the purchase of the
Subject Interests (the "Purchase Price") shall be the sum of Three Million and
No/100 Dollars ($3,000,000.00) subject to post-closing adjustments as provided
in Sections 4 and 5 below. The Purchase Price shall be allocated among Sellers
as follows:

<TABLE>
<S>                                               <C>        
         HHOC                                     $2,738,950
         HH96EDFT                                   $174,033
         HHOCERT                                     $87,017
</TABLE>

         The amount of the Purchase Price allocable to each Seller shall be
delivered by Purchaser to such Seller in good funds by cashiers check or by wire
transfer to an account at such Seller's bank (instructions to be given to
Purchaser by each Seller) upon the tender or delivery to Purchaser by Sellers of
the Assignment as part of the Closing.

         The portion of the Purchase Price allocable to HHOC shall be allocated
among tangibles and reserves comprising the Subject Interests as follows: (a)
ninety-seven percent (97%) of such portion of the Purchase Price shall be
attributed to the interest of HHOC in the Subject Leases, the Subject Easements,
and the Subject Contracts and (b) three percent (3%) of such portion of the
Purchase Price shall be attributed to the Subject Lease Equipment, the Subject
Pipeline Equipment, and other personal property. Purchaser and HHOC agree to be
bound by the allocation of the portion of the Purchase Price allocable to HHOC
among tangibles and reserves set forth herein for all purposes; to report such
allocations consistently for all federal, state and local income tax purposes;
and to file timely all reports required by the Internal Revenue Code of 1986, as
amended, or applicable state or local law concerning the foregoing allocation of
that portion of the Purchase Price allocable to HHOC.

         3. EFFECTIVE DATE. The effective date of the purchase of the Subject
Interests by Purchaser shall be 12:01 a.m., Houston, Texas time on October 1,
1998 (the "Effective Date").

         4. CERTAIN ADJUSTMENTS TO PURCHASE PRICE.




<PAGE>   5


Hall-Houston Oil Company et al.
November 20, 1998
Page 5



                  (a) INCREASES TO PURCHASE PRICE. The portion of the Purchase
         Price allocable to each Seller shall be increased, in the post-Closing
         settlement pursuant to Section 4(c) below, by the following:

                      (i)  an amount equal to the quantity of merchantable oil
                           produced from or allocable to the interest of such
                           Seller in the Leases and in storage at the Effective
                           Date, and not sold or disposed of prior to the
                           Closing, multiplied by the market price for such oil
                           at the Effective Date, net of all taxes and gravity
                           adjustments and transportation expenses necessary to
                           market such production; and

                      (ii) an amount equal to production, severance, and similar
                           taxes and assessments (other than income taxes) paid
                           by such Seller in respect of production of
                           Hydrocarbons from or allocable to the Subject Leases
                           occurring on or after the Effective Date (Sellers
                           shall be entitled to, and shall retain to the extent
                           received prior to preparation of the Settlement
                           Statement, as such terms is defined hereinafter, any
                           refunds of production, severance or other similar
                           taxes and assessments (other than income taxes) to
                           the extent pertaining to production of Hydrocarbons
                           from or allocable to the Subject Leases occurring
                           prior to the Effective Date).

                  In addition, the portion of the Purchase Price allocable to
         HHOC shall be increased, in the post-Closing settlement pursuant to
         Section 4(c) below, by the sum of the amount of the direct capital
         expenses with respect to the Subject Leases or the pipelines located on
         the lands covered by the Subject Easements approved by Purchaser in
         accordance with Section 8 or otherwise made in accordance with this
         Agreement, plus direct lease and pipeline operating expenses under
         applicable operating agreements and general and administrative charges,
         if any, payable to any third-party operator under applicable operating
         agreements, in each instance that are (x) attributable to the Subject
         Interests during the period between the Effective Date and Closing, (y)
         incurred and paid by HHOC (whether before or after the Closing), and
         (z) in excess of reimbursements or advances from joint owners under
         applicable operating agreements under which HHOC serves as operator.




<PAGE>   6


Hall-Houston Oil Company et al.
November 20, 1998
Page 6



                  (b) DECREASES TO PURCHASE PRICE. The portion of the Purchase
         Price allocable to each Seller shall be decreased, in the post-Closing
         settlement pursuant to Section 4(c) below, by the following:

                      (i) the amount of net proceeds or other value received by
                      such Seller for the sale or disposition of production of
                      Hydrocarbons from or allocable to the Subject Leases
                      occurring on and after the Effective Date;

                      (ii) the amount of net proceeds or other value received by
                      or payable to such Seller for the sale or disposition, on
                      and after the Effective Date, of any portion of the
                      Subject Interests; and

                      (iii) an amount equal to the agreed value of all uncured
                      Title Defects with respect to the interest of such Seller,
                      as determined in accordance with applicable provisions of
                      Section 5.

                  (c) POST-CLOSING SETTLEMENT. As soon as practicable, but not
         more than ninety (90) days following the date of the Closing (the
         "Closing Date"), HHOC shall provide to Purchaser a settlement statement
         (the "Settlement Statement"), subject to audit and verification by
         Purchaser which sets forth an accounting, prepared separately by well
         for each of the wells described in Exhibit "A" or Exhibit "A-1" hereto
         and for each related pipeline and for each Seller, of the portion of
         the Purchase Price allocable to such Seller and increases and decreases
         thereto pursuant to the provisions of Section 4(a) and Section 4(b),
         respectively. If the aggregate decreases as to any Seller reflected in
         the Settlement Statement exceed the aggregate increases as to such
         Seller reflected in the Settlement Statement, such statement shall be
         accompanied by a check of such Seller payable to Purchaser in the
         amount of such excess. If the aggregate increases as to any Seller
         reflected in the Settlement Statement exceed the aggregate decreases as
         to such Seller reflected in the Settlement Statement, such statement
         shall be accompanied by an invoice from such Seller, to be paid
         promptly by Purchaser, for a sum equal to the amount of such excess.
         The Settlement Statement shall be prepared in accordance with customary
         accounting principles used in the oil and gas industry. If, after the
         Closing, Sellers receive any payments with respect to the sale of
         production of oil and/or gas from or allocable to the Subject Leases
         occurring on or after the Effective Date and the Purchase Price has
         already been adjusted pursuant to this Section 4, then each relevant
         Seller shall deliver such proceeds to Purchaser promptly.




<PAGE>   7


Hall-Houston Oil Company et al.
November 20, 1998
Page 7



                  (d) AD VALOREM TAXES. Ad valorem and property taxes
         attributable to the Subject Interests for the current year shall be
         allocated between Sellers and Purchaser based upon the ratio of the
         period of ownership during the current year by Sellers prior to the
         Effective Date and by Purchaser on and after the Effective Date. Ad
         valorem and property taxes assessed with respect to the Subject
         Interests for the current year shall be the responsibility of, and
         shall be paid by, Purchaser; provided, however, the amount thereof
         allocable to each Seller, as provided above in this Section 4(d), shall
         serve to increase any post-closing refund by such Seller to Purchaser,
         as provided above in Section 4(c) above, or to reduce any additional
         amount payable by Purchaser to such Seller, as provided above in
         Section 4(c) above.

         5. DUE DILIGENCE REVIEW AND OBJECTIONS.

                      (a) ACCESS AND INSPECTION. To the extent they have the
         legal right to do so and subject to the limitations set forth below in
         this Section 5, Sellers shall afford to Purchaser and its authorized
         representatives (during the period from the date hereof until the
         Closing and during normal business hours), reasonable access to the
         Subject Leases, the Subject Lease Equipment, the Subject Easements, and
         the Subject Pipeline Equipment and to the following types of data
         related to the Subject Interests in the possession of any of Sellers:
         accounting, title, contract, corporate and legal materials and
         operating data and information available as of the date hereof and that
         becomes available to any of Sellers at any time prior to the Closing.
         In addition, Sellers shall furnish to Purchaser such other information
         as Purchaser may reasonably request. Purchaser shall be authorized, at
         its expense (and using its own copying equipment), to make such copies
         of such data as it reasonably deems relevant; provided, however, to the
         extent that geophysical data pertaining to the Subject Leases held by
         any of Sellers is subject to restrictions imposed by licenses or other
         agreements, such restrictions shall govern and control the extent to
         which Purchaser shall have access thereto. All visits to any of
         Sellers' facilities by Purchaser or on Purchaser's behalf shall be
         scheduled by mutual consent of the parties hereto subject to
         Purchaser's providing Sellers with reasonable advance notice of the
         locations that Purchaser wishes to visit and the proposed times. Any of
         Sellers may accompany Purchaser and its representatives during their
         site visits. Entry onto the Subject Leases shall be (i) subject to
         valid third-party restrictions, if any, existing under the terms of any
         of the Subject Leases, the Subject Easements or the Subject Contracts,
         and to any Seller's industrial safety, hygiene, and drug and alcohol
         requirements and (ii) at Purchaser's sole risk and expense. Sellers
         shall use reasonable efforts to identify for Purchaser, upon request,
         any third-party restrictions to which Purchaser may be subject in
         exercising its rights to enter upon the lands covered by any of the
         Subject Leases. Purchaser may conduct, prior to the Closing and at its
         cost, such



<PAGE>   8


Hall-Houston Oil Company et al.
November 20, 1998
Page 8



         further review of data and information pertaining to the Subject
         Interests, and title examination and other examinations and
         investigations in respect of the Subject Interests, as Purchaser
         desires.

                  (b) ENVIRONMENTAL ASSESSMENT. Without limitation of the right
         of Purchaser to conduct any investigations of the Subject Interests,
         Purchaser may conduct an environmental assessment of the lands covered
         by the Subject Leases and the lands covered by the Subject Easements.
         If Purchaser undertakes an environmental assessment, both the
         consultant (if consultants are employed) and the scope of the proposed
         assessment, including, but not limited to, testing protocols, must be
         acceptable to Sellers before the work may begin, such acceptance not to
         be unreasonably withheld by Sellers. Purchaser shall deliver to
         Sellers, at Purchaser's cost, copies of all final reports, results,
         data, and analyses of site visits, inspections, and assessments within
         seven (7) days of Purchaser's receipt thereof. If required by
         applicable law, Sellers may disclose such reports, results, data, and
         analyses of site visits, inspections, and assessments delivered to
         Sellers by Purchaser.

                  PURCHASER ACKNOWLEDGES THAT PORTIONS OF THE SUBJECT INTERESTS
         MAY BE CONTAMINATED WITH NATURALLY OCCURRING RADIOACTIVE MATERIALS
         ("NORM"), AND, UPON CLOSING, PURCHASER HEREBY ACCEPTS, WITH RESPECT TO
         THE SUBJECT INTERESTS, FULL RESPONSIBILITY FOR COMPLYING WITH ALL LEGAL
         REQUIREMENTS APPLICABLE TO NORM, SUBJECT TO THE PROVISIONS OF SECTION
         12.

                  (c) TITLE DEFECTS AND RELATED PURCHASE PRICE ADJUSTMENTS. For
         purposes of this Section 5(c) and other relevant provisions of this
         Agreement, the following terms shall have the meaning assigned to such
         terms, respectively, below:

                   "TITLE DEFECT" means any encumbrance, irregularity or defect
                  in the title of any Seller to any Subject Interest which,
                  alone or in combination with other defects, causes such title
                  to be less than Marketable Title.

                  "MARKETABLE TITLE" means such title and ownership of a Seller
                  (pursuant to instruments filed of record in Wharton County,
                  Texas) that (i) will entitle Purchaser, as such Seller's
                  successor, to receive not less than the relevant Net Revenue
                  Interest set forth in Exhibit "A-1" of all Hydrocarbons
                  produced under the terms of the Subject Leases (or other
                  property denominated in Exhibit "A-1") and own not less than
                  the relevant Working Interest set forth



<PAGE>   9


Hall-Houston Oil Company et al.
November 20, 1998
Page 9



                  in Exhibit "A-1" in and to the Subject Easements and the
                  pipelines and other Subject Pipeline Equipment located on the
                  lands covered by the Subject Easements; (ii) will obligate
                  Purchaser, as such Seller's successor, to bear a percentage of
                  costs and expenses related to the maintenance, operation, and
                  development of the Subject Leases and the pipelines located on
                  the lands covered by the Subject Easements (or other property
                  denominated in Exhibit "A-1") not greater than the relevant
                  Working Interest set forth in Exhibit "A- 1," unless the
                  circumstances causing the Working Interest to be greater will
                  cause the corresponding Net Revenue Interest to increase in at
                  least the same proportion; and (iii) is free of all claims,
                  liens, security interests, encumbrances, and defects
                  (including, without limitation, legal actions), except for
                  Permitted Encumbrances.

                  "Permitted Encumbrances" means:

                      (i) lessor's royalties, overriding royalties, production
                      payments, net profits, interests, reversionary interests
                      and similar burdens on production that do not, and will
                      not, reduce the relevant Net Revenue Interest of
                      Purchaser, as a Seller's successor in title, below that
                      shown in Exhibit "A-1" or increase the relevant Working
                      Interest of Purchaser, as such Seller's successor in
                      title, above that shown in Exhibit "A-1" (unless the
                      circumstances causing the Working Interest to increase
                      will cause the corresponding Net Revenue Interest to
                      increase at least in the same proportion);

                      (ii) preferential rights to purchase and third-party
                      consents with respect to which, prior to the Closing, (A)
                      waivers or consents are obtained from the appropriate
                      persons or (B) the time for asserting such rights has
                      expired without exercise;

                      (iii) mechanics', materialmen's, operator's and
                      non-operators', tax and similar liens or charges arising
                      in the ordinary course of business related to a Subject
                      Interest, if such liens or charges secure payments not yet
                      due;

                      (iv) all consents from, notices to, approvals by or other
                      actions by governmental authorities in connection with
                      sale or transfer of properties



<PAGE>   10


Hall-Houston Oil Company et al.
November 20, 1998
Page 10



                      such as the Subject Interests, if such matters are
                      customarily and appropriately obtained after the sale or
                      transfer;

                      (v) liens, security interests or other encumbrances that
                      are released at or prior to the Closing pursuant to the
                      terms of releases and other instruments in form and
                      substance reasonably satisfactory to Purchaser and
                      executed, delivered, and acknowledged by the owner and
                      holder thereof;

                      (vi) rights of any governmental authority to control or
                      regulate the Subject Interests, together with all
                      applicable laws, rules and regulations;

                      (vii) easements, rights-of-way, surface leases and other
                      surface use restrictions, if such restrictions will not
                      materially adversely affect the use, value or operation of
                      any of the Subject Interests; and

                      (viii) title and other matters waived or deemed to be
                      waived by Purchaser pursuant to any provision of this
                      Section 5.

                  Should, as a result of examinations and investigations or
         otherwise, one or more matters come to Purchaser's attention which
         constitute a Title Defect and that Purchaser desires to assert as a
         basis to seek an adjustment of the Purchase Price and/or as a basis not
         to proceed with the Closing, Purchaser shall notify Sellers in writing
         of such Title Defects no later than five (5) Business Days (for
         purposes of this Agreement the term "Business Day" means any day except
         a Saturday, Sunday or other day on which commercial banks in Houston,
         Texas are required or authorized by law to be closed) prior to the
         Closing Date. Such notification (a "Title Defect Notice") shall
         include, for each asserted Title Defect, (i) a description of the Title
         Defect and the Subject Interest to which it applies; (ii) an
         explanation of the basis for the claim of a Title Defect and (iii) the
         amount by which Purchaser would propose to adjust the portion of the
         Purchase Price allocable to any Seller in view of such Title Defect.
         Any matter, whether or not asserted in a Title Defect Notice, that may
         constitute a Title Defect shall be deemed to have been waived by
         Purchaser in the event that Purchaser proceeds with the Closing without
         the Title Defect having been cured.

                  (d) DISPOSITION OF TITLE DEFECTS. In the event that Purchaser
         gives Sellers any Title Defect Notice:




<PAGE>   11


Hall-Houston Oil Company et al.
November 20, 1998
Page 11



                      (i) Sellers may attempt to cure the relevant Title Defect
                      prior to the Closing;

                      (ii) whether or not Sellers have then begun to, or ever
                      begin to, cure any asserted Title Defect (there being no
                      obligation on the part of Seller to cure any Title
                      Defect), Sellers may postpone the Closing by designating a
                      new Closing Date to be a date not later than ten (10) days
                      after the deadline for the Closing provided in Section
                      10(a); and

                      (iii) notwithstanding any other election made under this
                      Section 5(d) (it being expressly recognized that attempts
                      to cure asserted Title Defects may continue while the
                      parties hereto are acting under this election), the
                      parties hereto may elect to proceed with respect to one or
                      more asserted Title Defects under the provisions of
                      Section 5(e).

                  (e) Purchase Price Adjustments for Title Defects.

                      (i) Not later than five (5) Business Days after actual
                      receipt of any Title Defect Notice, the parties shall
                      enter into good faith negotiations and attempt to agree on
                      whether such claimed matters constitute a Title Defect for
                      the purposes of this Agreement and/or the appropriate
                      downward adjustment to the Purchase Price in connection
                      therewith; provided, however, there shall be no downward
                      adjustment to the Purchase Price as the result of Title
                      Defects unless the agreed value of all Title Defects
                      asserted by Purchaser in a timely manner prior to the
                      Closing exceeds $30,000 and, unless such threshhold is
                      exceeded, Purchaser shall have no right, notwithstanding
                      any provision of this Agreement to the contrary, to
                      terminate this Agreement. If the parties have not reached
                      a written agreement on any such matters within three (3)
                      Business Days after the commencement of such negotiations,
                      then, subject to the proviso in the immediately preceding
                      sentence, either Sellers or Purchaser may terminate this
                      Agreement by notice in writing to Purchaser or Sellers, as
                      the case may be.

                      (ii) If all issues to be determined pursuant to this
                      Section 5(e) have not been determined at least two (2)
                      Business Days prior to the Closing Date, then at the
                      election of either Sellers or Purchaser, subject in all
                      respects



<PAGE>   12


Hall-Houston Oil Company et al.
November 20, 1998
Page 12



                      to the termination rights under Section 10(a), the Closing
                      Date shall be deferred until all such issues have been
                      determined in accordance with this Section 5(e), but in no
                      event longer than ten (10) days, and all subsequent dates
                      and required activities having reference to the Closing
                      Date shall be correspondingly deferred.

                      (iii) Subject to the provisions of subsection (i) of this
                      Section 5(e), with respect to any Title Defect that any
                      Seller elects not to cure or that any Seller fails to cure
                      prior to the Closing, the portion of the Purchase Price
                      allocable to such Seller shall be reduced by the amount
                      determined with respect to such Title Defect pursuant to
                      subsection (i) of this Section 5(e), unless Purchaser or
                      Sellers elect(s) to terminate this Agreement pursuant to
                      subsection (iv) of this Section 5(e).

                      (iv) Notwithstanding anything contained herein to the
                      contrary, other than the proviso appearing in the first
                      sentence of subsection (i) of this Section 5(e), in the
                      event that any Title Defect that is asserted in a Title
                      Defect Notice is not cured prior to Closing, resolved
                      pursuant to subsection (i) of this Section 5(e), or waived
                      in writing by Purchaser, Purchaser or Sellers may
                      terminate this Agreement by notice in writing to Purchaser
                      or Sellers, as the case may be.

                  (f) NO WARRANTY OF MERCHANTABILITY OR FITNESS. EXCEPT AS
         OTHERWISE SPECIFICALLY SET FORTH IN THIS AGREEMENT, HHOC MAKES NO
         WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
         WARRANTY OF MERCHANTABILITY AND THE IMPLIED WARRANTY OF FITNESS FOR A
         PARTICULAR PURPOSE, REGARDING THE SUBJECT LEASE EQUIPMENT, THE SUBJECT
         PIPELINE EQUIPMENT, AND OTHER PERSONAL PROPERTY INCLUDED IN THE SUBJECT
         INTERESTS, AND THE SAME ARE TO BE SOLD BY HHOC AND ACCEPTED BY
         PURCHASER ON AN "AS IS" AND "WHERE IS" BASIS AND CONDITION.

                  (g) WAIVER OF CONSUMER RIGHTS. PURCHASER WAIVES ITS RIGHTS
         UNDER THE TEXAS DECEPTIVE TRADE PRACTICES-CONSUMER PROTECTION ACT,
         SECTION 17.41 ET SEQ., TEXAS BUSINESS & COMMERCE CODE, A LAW THAT GIVES
         CONSUMERS SPECIAL RIGHTS AND PROTECTIONS. AFTER CONSULTATION WITH AN
         ATTORNEY OF PURCHASER'S OWN SELECTION,



<PAGE>   13


Hall-Houston Oil Company et al.
November 20, 1998
Page 13



         PURCHASER VOLUNTARILY CONSENTS TO THIS WAIVER. IN ORDER TO EVIDENCE ITS
         ABILITY TO GRANT SUCH WAIVER, PURCHASER HEREBY REPRESENTS AND WARRANTS
         TO SELLERS THAT PURCHASER (I) IS IN THE BUSINESS OF SEEKING OR
         ACQUIRING BY PURCHASE OR LEASE, GOODS OR SERVICES FOR COMMERCIAL OR
         BUSINESS USE, (II) HAS KNOWLEDGE AND EXPERIENCE IN FINANCIAL AND
         BUSINESS MATTERS THAT ENABLE IT TO EVALUATE THE MERITS AND RISKS OF THE
         TRANSACTION CONTEMPLATED HEREBY AND (III) IS NOT IN A SIGNIFICANTLY
         DISPARATE BARGAINING POSITION.

         6. WARRANTIES AND REPRESENTATIONS OF SELLERS. Each Seller shall convey
the Subject Interests to Purchaser with the warranties and representations set
forth in the Assignment, which warranties and representations are made
severally, and not jointly, as to the portion of the Subject Interests owned by
each Seller. In addition, each Seller, solely as to such Seller, warrants and
represents to Purchaser (with such warranties and representations surviving the
Closing for a period of one year) that as of the date hereof and as of the
Closing:

                  (a) ORGANIZATION AND QUALIFICATION. HHOC is a corporation,
         duly organized, validly existing and in good standing under the laws of
         the State of Texas. Each of the Trusts is a trust created and existing
         under the laws of the State of Texas.

                  (b) AUTHORITY. Each Seller has all requisite power and
         authority to own and sell the Subject Interests which it owns, to carry
         on its business as presently conducted, to enter into this Agreement
         and to perform its obligations hereunder, and delivery and performance
         of this Agreement do not (i) conflict with or violate any Seller's
         articles of incorporation or bylaws or other governing documents, or
         any agreement or instrument to which any Seller is a party or by which
         any Seller is bound, or any law, administrative regulation or rule,
         judgment, decree, order or statute applicable to any Seller, or (ii)
         constitute a material breach of, or any event of default under, any
         contract to which any Seller is a party or by which any Seller or its
         assets are bound, or constitute the happening of an event or condition
         upon which any other party to such contract or agreement may exercise
         any right or option which will materially and adversely affect any of
         the Subject Interests.

                  (c) EXECUTION OF AGREEMENT AND CLOSING DOCUMENTS. This
         Agreement has been duly authorized (as necessary), executed, and
         delivered on behalf of each Seller, and at the Closing all documents
         and instruments required hereunder to be executed and delivered by each
         Seller shall have been duly authorized, executed, and delivered by such
         Seller. This



<PAGE>   14


Hall-Houston Oil Company et al.
November 20, 1998
Page 14



         Agreement constitutes the valid and binding agreement of each Seller
         enforceable against such Seller in accordance with its terms.

                  (d) LITIGATION AND UNDISCLOSED LIABILITIES. No claim, suit,
         action, insolvency case or other proceeding is pending or, to the best
         of any Seller's knowledge, threatened before any court or governmental
         authority which might (i) result in impairment or loss to any Seller of
         title to any part of the Subject Interests or the value thereof, (ii)
         hinder or impede the operation of the Subject Interests or (iii)
         hinder, impede, or prevent any Seller from being able to consummate the
         transaction contemplated by this Agreement. Each Seller shall promptly
         notify Purchaser of any such matter arising prior to the Closing with
         respect to which such Seller receives actual notice. There are no
         bankruptcy, reorganization or arrangement proceedings pending, being
         contemplated by or threatened against any Seller.

                  (e) TITLE TO SUBJECT INTERESTS. The following statements
         regarding Sellers' title to the Subject Interests are substantially
         correct and not materially misleading in any respect:

                      (i) to the best of such Seller's knowledge, such Seller is
                      not in default under some material provision of a lease,
                      agreement or other contract affecting the Subject
                      Interests;

                      (ii) to the best of such Seller's knowledge, the Subject
                      Leases are in full force and effect and all royalties and
                      other amounts due and owing under the Subject Leases
                      (including, but not limited to, shut-in royalties, delay
                      rentals, and payments in respect of damages to the surface
                      of the lands covered by the Subject Leases) have been paid
                      timely and in full, and no notices have been received by
                      any Seller of any claim to the contrary;

                      (iii) to the best of such Seller's knowledge, the Subject
                      Interests include all rights of ingress and egress and
                      other rights necessary for operations currently conducted
                      on the Subject Interests and for the production, treating,
                      storing, marketing or transportation of oil and/or gas
                      produced from or allocable to the Subject Leases;

                      (iv) the Subject Interests are not subject to any liens,
                      mortgages, deeds of trust, preferential rights to
                      purchase, requirements for consents to assignment,
                      reversionary rights in favor of third parties or other



<PAGE>   15


Hall-Houston Oil Company et al.
November 20, 1998
Page 15



                      encumbrances other than Permitted Encumbrances and those 
                      identified on Exhibit "A" hereto;

                      (v) each Seller is entitled to receive not less than the
                      Net Revenue Interests (N.R.I.) set forth in Exhibit "A-1 "
                      as to such Seller and is not obligated to pay costs and
                      expenses relating to the Subject Interests in an amount
                      greater than the Working Interests (W.I.) set forth in
                      Exhibit "A-1" as to such Seller for each of the Subject
                      Leases; and

                      (vi) since the Effective Date, there has been no material
                      change in the condition of the Subject Interests other
                      than normal production of Hydrocarbons and depreciation of
                      Subject Lease Equipment and the Subject Pipeline Equipment
                      through ordinary wear and tear.

                  (f) SUBJECT CONTRACTS. The Subject Contracts listed under the
         heading "Permitted Encumbrances" in Exhibit "A" hereto, including, but
         not limited to, the operating agreements applicable to the operation of
         the Subject Leases and the pipelines located on the lands covered by
         the Subject Easements and the pipelines located on the lands covered by
         the Subject Easements, are in force and effect, no Seller has been
         advised of a default under any such agreement, and there are no joint
         interest audits being conducted, nor any disputes concerning any such
         agreement. The execution and delivery of this Agreement and the
         consummation of the transaction contemplated hereby will not be
         considered a default under any of such Subject Contracts, except to the
         extent of any default thereunder waived by the necessary parties prior
         to the Closing.

                  (g) PREPAYMENT ARRANGEMENTS AND IMBALANCES. No Seller is
         obligated, by virtue of a take-or-pay or other prepayment arrangement,
         a gas balancing arrangement, or any similar provision in any contract
         for the sale of oil and/or gas, to deliver oil and/or gas produced from
         or allocable to the Subject Interests at some future time without
         receiving full payment therefor. No natural gas included in the Subject
         Interests and physically produced (but not sold) before the Effective
         Date is in storage. No Seller has produced a share of gas from or
         attributable to the Subject Leases greater than its ownership
         percentage of such gas and no Seller is under an obligation to reduce
         its share of production of such gas from or attributable to the Subject
         Leases under any gas balancing agreement or similar contract to allow
         any under produced parties to come back into balance.




<PAGE>   16


Hall-Houston Oil Company et al.
November 20, 1998
Page 16



                  (h) COMPLIANCE WITH PRICING LAWS. To the best of its
         knowledge, no Seller has received any proceeds from the sale of
         production of Hydrocarbons from or allocable to the Subject Leases in
         excess of the amounts permitted under applicable laws, rules and
         regulations of the United States government or any state government. To
         the best of its knowledge, no Seller has actual or asserted liability,
         nor any potential liability, for the refund of any such proceeds or any
         interest or penalties thereon.

                  (i) TAXES. Any and all ad valorem, production, severance,
         windfall profit and similar taxes and assessments based on or measured
         by each Seller's ownership of the Subject Interests, Hydrocarbon
         reserves attributable to the Subject Interests, the production of such
         Hydrocarbons, or the receipt of proceeds therefrom for all years prior
         to the year in which this Agreement is executed have been properly
         paid, and all such taxes and assessments which become due and payable
         prior to the Closing shall be properly paid by each Seller. There are
         no assessed tax deficiencies against any Seller with respect to the
         Subject Interests owned by such Seller or the production of
         Hydrocarbons therefrom and no audits presently being conducted by any
         federal, state or local authority regarding taxes allegedly due and
         owing by such Seller and affecting the Subject Interests or the
         production of Hydrocarbons from or allocable to the Subject Leases.
         Purchaser acknowledges that, to the extent that there exists any
         production tax refund entitlement with respect to production of
         Hydrocarbons from or attributable to the Subject Interests occurring
         prior to the Effective Date, the same shall be deemed to be the
         property of HHOC or one or both of the Trusts, as the case may be, and
         shall not be deemed to be conveyed, or subject to conveyance, pursuant
         to the terms of this Agreement or the Assignment.

                  (j) BROKERS' FEES. No Seller has incurred any liability,
         contingent or otherwise, for broker's or finder's fees in respect of
         the transaction which is the subject of this Agreement for which
         Purchaser shall have any responsibility whatsoever.

                  (k) COMPLIANCE WITH LAWS. All laws, regulations and orders of
         all governmental authorities having jurisdiction over the Subject
         Interests have been, to the best knowledge of each Seller, complied
         with and shall continue to be complied with until the Closing,
         including, but not limited to, all state, federal, and local
         environmental laws, all applicable permitting procedures for the
         drilling or operation of oil and gas wells, and all applicable laws
         regarding the spacing, completion, and bottoming of wells, the disposal
         of water therefrom, the prorating of production therefrom, and all
         other conservation matters. Without limiting the generality of the
         foregoing, no well constituting a part of the Subject Interests is
         shut-in, curtailed or otherwise subject to penalties on allowables
         because of any



<PAGE>   17


Hall-Houston Oil Company et al.
November 20, 1998
Page 17



         over production which would prevent the full legal and regular
         allowable (including, but not limited to, maximum permissible
         tolerance), as prescribed by any court or federal, state or local
         governmental authority, to be assigned to any such well.

                  (l) CONDITION OF PERSONAL PROPERTY. Without in any manner
         impairing the disclaimer of certain warranties by Sellers provided in
         Section 5(f), to the best of each Seller's knowledge, all personal
         property and equipment included within, located on or used in
         connection with the Subject Interests has been operated in accordance
         with industry standards, has been maintained in a good and workmanlike
         manner, is in a state of good repair (ordinary wear and tear excepted),
         and is free from material defects.

         7. WARRANTIES AND REPRESENTATIONS OF PURCHASER. Purchaser warrants and
represents to Sellers that, as of the date hereof and as of the Closing:

                  (a) CORPORATE ORGANIZATION AND QUALIFICATION. Purchaser is a
         corporation duly organized and validly existing and in good standing
         under the laws of the State of Texas.

                  (b) AUTHORITY. Purchaser has all requisite corporate power and
         authority to carry on its business as presently conducted, to enter
         into this Agreement and to perform its obligations hereunder, and
         delivery and performance of this Agreement do not (i) conflict with or
         violate Purchaser's articles or certificates of incorporation or
         bylaws, or any agreement or instrument to which Purchaser is a party or
         by which Purchaser is bound, or any law, administrative regulation or
         rule, judgment, decree, order or statute applicable to Purchaser, or
         (ii) constitute a material breach of, or any event of default under,
         any contract to which Purchaser is a party or by which Purchaser or its
         assets are bound, or constitute the happening of an event or condition
         upon which any other party to such contract or agreement may exercise
         any right or option which will materially adversely affect any of the
         Subject Interests.

                  (c) EXECUTION OF AGREEMENT AND CLOSING DOCUMENTS. This
         Agreement has been duly authorized, executed, and delivered on behalf
         of Purchaser, and at the Closing all documents and instruments required
         hereunder to be executed and delivered by Purchaser shall have been
         duly authorized, executed, and delivered.

                  (d) BROKER'S FEES. Purchaser has incurred no liability,
         contingent or otherwise, for broker's or finder's fees in respect of
         the transaction which is the subject of this Agreement for which
         Sellers shall have any responsibility whatsoever.



<PAGE>   18


Hall-Houston Oil Company et al.
November 20, 1998
Page 18



         8. OPERATIONS. HHOC covenants that, from the date hereof through the
Closing Date, except as provided herein or as otherwise consented to in writing
by Purchaser, HHOC will:

                  (a) not (i) in any manner deal with, incur obligations with
         respect to, or undertake any transactions relating to, the Subject
         Interests other than transactions (A) in the normal, usual and
         customary manner, (B) of a nature and in an amount consistent with
         prior practice, and (C) in the ordinary and regular course of business
         of owning and operating the Subject Interests; (ii) acquire, dispose
         of, encumber or relinquish any of the Subject Interests; or (iii)
         waive, compromise or settle any right or claim that would adversely
         affect the ownership, operation or value of any of the Subject
         Interests after the Effective Date, provided, however, that if HHOC
         undertakes to make any capital expenditures or work-over expenditures
         with respect to the Subject Interests (except when required by an
         emergency when there shall have been insufficient time to notify
         Purchaser) in excess of $5,000, it shall notify Purchaser and obtain
         Purchaser's written consent thereto, which consent shall not withheld
         or delayed unreasonably;

                  (b) use all reasonable efforts to preserve relationships with
         all third parties having business dealings with respect to the Subject
         Interests; and

                  (c) maintain in effect insurance providing the same type
         coverage, in the same amounts, and with the same deductibles as the
         insurance maintained in effect by HHOC on the Effective Date.



         9. CONDITIONS TO CLOSING.

                  (a) SELLER'S CONDITIONS. Sellers' obligation to proceed with
         the Closing is subject to the satisfaction, as of the Closing Date, of
         the following conditions, which shall be deemed satisfied upon the
         occurrence of the Closing:

                      (i) the representations and warranties of Purchaser set
                      forth in this Agreement shall be true and correct, in all
                      material respects (except to the extent such
                      representations and warranties speak as of an earlier
                      date), as though made at and as of the Closing;




<PAGE>   19


Hall-Houston Oil Company et al.
November 20, 1998
Page 19



                      (ii) Purchaser shall have performed, in all material
                      respects, the covenants and agreements which Purchaser was
                      required to perform or satisfy at or prior to the Closing;

                      (iii) except for matters not customarily and appropriately
                      obtained prior to the Closing, Sellers have received
                      evidence, in form reasonably satisfactory to their
                      counsel, that all permits, consents, approvals, licenses,
                      qualifications, and orders required by governmental
                      authority, or the terms of any of the Subject Interests,
                      to be obtained prior to the Closing have been obtained or
                      waived;

                      (iv) there shall be no action or proceeding pending or
                      threatened before a court arbitrator or governmental
                      authority seeking to restrain or prohibit the consummation
                      of the transaction contemplated by this Agreement or to
                      obtain substantial damages from any of Sellers related to
                      this Agreement; and

                      (v) all Title Defects asserted in any Title Defect Notice
                      shall have been (A) cured, (B) resolved pursuant to
                      Section 5(e) or (C) waived in writing by Purchaser.

                  (b) PURCHASER'S CONDITIONS. Purchaser's obligation to proceed
         with the Closing is subject to the satisfaction, as of the Closing
         Date, of the following conditions which shall be deemed satisfied upon
         the occurrence of Closing:

                      (i) the representations and warranties of Sellers set
                      forth in this Agreement shall be true and correct, in all
                      material respects, (except to the extent such
                      representations and warranties speak as of an earlier
                      date) as though made at and as of the Closing;

                      (ii) Sellers shall have performed, in all material
                      respects, the covenants and agreements which Sellers were
                      required to perform or satisfy at or prior to the Closing;

                      (iii) except for matters not customarily and appropriately
                      obtained prior to the Closing, Purchaser shall have
                      received evidence, in form reasonably satisfactory to its
                      counsel, that all permits, consents,



<PAGE>   20


Hall-Houston Oil Company et al.
November 20, 1998
Page 20



                      approvals, licenses, qualifications, and orders required
                      by any governmental authority, or the terms of any of the
                      Subject Interests, to be obtained have been obtained or
                      waived;

                      (iv) there shall be no action or proceeding pending or
                      threatened before a court, arbitrator or governmental
                      authority seeking to restrain or prohibit the consummation
                      of the transaction contemplated by this Agreement or to
                      obtain substantial damages from Purchaser related to this
                      Agreement;

                      (v) all Title Defects asserted in any Title Defect Notice
                      shall have been (A) cured, (B) resolved pursuant to
                      Section 5(e) or (C) waived in writing by Purchaser; and

                      (vi) since the Effective Date, there shall have been no
                      material adverse change in the condition of the Subject
                      Leases, the Subject Lease Equipment or the Subject
                      Pipeline Equipment, except depletion through normal
                      production within authorized allowables, changes in rates
                      of production that occur in the ordinary course of
                      operation of the Subject Leases, and depreciation of the
                      Subject Lease Equipment and the Subject Pipeline Equipment
                      through ordinary wear and tear.




<PAGE>   21


Hall-Houston Oil Company et al.
November 20, 1998
Page 21



         10. TERMINATION AND LIABILITIES UPON TERMINATION.

                  (a) Right to Terminate. This Agreement and the transaction
                  contemplated by this Agreement may be terminated in the
                  following situations:

                      (i) by Sellers or Purchaser, if the Closing does not occur
                      on or before December 11, 1998; provided, however, that
                      neither Sellers nor Purchaser may terminate this Agreement
                      if, as the case may be, it is or they are in breach of
                      this Agreement;

                      (ii) by Sellers, if the conditions contained in Section
                      9(a) are not satisfied or waived as of the Closing Date;

                      (iii) by Purchaser, if the conditions contained in Section
                      9(b) are not satisfied or waived as of the Closing Date;
                      and

                      (iv) by Sellers and Purchaser pursuant to written
agreement;

                  (b) LIABILITIES UPON TERMINATION. Subject to the further
         provisions of this Section 10(b), termination of this Agreement by any
         non-defaulting party, pursuant to Section 10(a), shall be in addition
         to any other rights or remedies available at law or in equity to such
         party, subject, however, to the provisions of Section 15 below, arising
         out of any failure by the other party or parties of any of its or their
         obligations under this Agreement or the failure of any representation
         or warranty made by the other party or parties in this Agreement to be
         true and correct, provided, however, (i) termination of this Agreement,
         with no party having any liability to any other, shall be the sole
         remedy of Purchaser should Sellers' warranty of title prove to be
         untrue or incorrect as a result of a Title Defect not resolved by
         mutual agreement of the parties and (ii) if Sellers terminate this
         Agreement should Sellers' warranty of title prove to be untrue or
         incorrect as a result of a Title Defect not resolved by mutual
         agreement of the parties, Sellers shall have no liability to Purchaser.
         In no event shall a party hereto be entitled to recover incidental,
         consequential, statutory, or punitive damages as a result of any
         termination of this Agreement or any breach of any representation,
         warranty, condition or covenant hereunder or a failure to perform an
         obligation hereunder.

         11. CLOSING. The Closing shall be held at 10:00 a.m. Houston, Texas
time at HHOC's offices in Houston, Texas on or before December 11, 1998, or at
such other time and place as may be mutually acceptable to Sellers and
Purchaser. At the Closing, each Seller shall execute and



<PAGE>   22


Hall-Houston Oil Company et al.
November 20, 1998
Page 22



deliver to Purchaser the Assignment, a statement to the effect that such Seller
is not a "foreign person" within the context of Treasury Regulations
ss.1.1445-2(b)(2), and such other documents as may be required hereunder to be
delivered by such Seller to Purchaser as a condition to the Closing. At the
Closing, Purchaser shall deliver or cause to be delivered to each Seller the
portion of the Purchase Price allocable to such Seller; Purchaser shall join in
execution of the Assignment; if Purchaser is to succeed HHOC as operator of the
Subject Leases and the pipelines located on the Subject Easements, Purchaser
shall execute all documents required by any governmental authority with
jurisdiction to evidence such succession by Purchaser and Purchaser shall
provide to HHOC evidence that Purchaser has in place with such governmental
authorities all bonds required as a result of such succession; and Purchaser
shall execute and deliver to Sellers such other documents as may be required to
be delivered by Purchaser to Sellers as a condition to the Closing.

         12. INDEMNITIES. ON AND AFTER THE CLOSING DATE, PURCHASER SHALL
PROTECT, INDEMNIFY, DEFEND, AND HOLD HARMLESS SELLERS, AND THE SHAREHOLDERS,
DIRECTORS, OFFICERS, TRUSTEES, BENEFICIARIES, EMPLOYEES, AND AGENTS OF ANY
SELLER, AND THE HEIRS, DEVISEES, SUCCESSORS AND ASSIGNS OF ANY OF THE FOREGOING
(COLLECTIVELY, THE "SELLER INDEMNITEES"), FROM AND AGAINST ANY AND ALL CLAIMS,
LIABILITIES, DEMANDS, LOSSES, DAMAGES, COSTS, EXPENSES, COURT COSTS, REASONABLE
ATTORNEY FEES, CAUSES OF ACTION, DEATHS, PERSONAL INJURIES, ILLNESSES, DISEASES,
LITIGATION, JUDGMENTS OR SETTLEMENTS PERTAINING TO THE SUBJECT INTERESTS ARISING
OUT OF ANY ACTIONS OR FAILURES TO ACT OCCURRING ON AND AFTER THE CLOSING DATE.
LIKEWISE, ON AND AFTER THE CLOSING DATE, SELLERS, SEVERALLY AND NOT JOINTLY,
SHALL PROTECT, INDEMNIFY, DEFEND AND HOLD HARMLESS PURCHASER AND THE
SHAREHOLDERS, DIRECTORS, OFFICERS, EMPLOYEES, AND AGENTS OF PURCHASER, AND THE
HEIRS, DEVISEES, SUCCESSORS, AND ASSIGNS OF ANY OF THE FOREGOING, FROM AND
AGAINST ANY AND ALL CLAIMS, LIABILITIES, DEMANDS, LOSSES, DAMAGES, COSTS,
EXPENSES, COURT COSTS, REASONABLE ATTORNEY FEES, CAUSES OF ACTION, DEATHS,
PERSONAL INJURIES, ILLNESSES, DISEASES, LITIGATION, JUDGMENTS OR SETTLEMENTS
PERTAINING TO THE SUBJECT INTERESTS ARISING OUT OF ANY ACTION OR FAILURES TO ACT
OCCURRING PRIOR TO THE CLOSING DATE. FURTHER TO THE FOREGOING, ON AND AFTER THE
CLOSING DATE, PURCHASER SHALL ASSUME ALL RESPONSIBILITY FOR, AND SHALL INDEMNIFY
ALL SELLER INDEMNITEES AGAINST ANY LIABILITY OR COST IN CONNECTION WITH, THE
PLUGGING OF THE WELLS AND THE RESTORATION OF THE SURFACE THAT RELATE TO THE
SUBJECT INTERESTS, WHETHER ARISING UNDER LAW, RULE OR REGULATION, BY AGREEMENT
OR OTHERWISE.

         13. ACCESS TO SUBJECT DATA. Upon the Closing, HHOC, for the same
consideration provided in Section 2 above, agrees to make the Subject Data
available to Purchaser at the offices of HHOC for review by Purchaser or its
designated representatives from time to time. The Subject Data shall be made
available during normal business hours and following reasonable advance notice
by Purchaser to HHOC. Subject to the need of HHOC to use such equipment (which
need shall have



<PAGE>   23


Hall-Houston Oil Company et al.
November 20, 1998
Page 23



priority over the rights of Purchaser), HHOC shall allow Purchaser or its
designated representatives to utilize 3D seismic workstations in HHOC's offices
in processing and interpreting portions of the Subject Data. In utilizing the
Subject Data and such equipment of HHOC, Purchaser and its designated
representatives shall not make any copies of the Subject Data or remove any of
the Subject Data from the offices of HHOC and Purchaser and its designated
representatives shall be subject to all confidentiality obligations and use
limitations applicable to HHOC, including, but not limited to, those contained
in the Exploration Agreement, and reasonable confidentiality policies and
procedures imposed by HHOC on Purchaser and its designated representatives to
protect the confidentiality of information and data in the offices of HHOC other
than the Subject Data. Purchaser agrees that it shall be responsible for
compliance by its designated representatives with confidentiality obligations
and use limitations applicable to the Subject Data and, if requested by HHOC,
shall cause each such designated representative to enter into a confidentiality
agreement with HHOC in form and substance acceptable to HHOC.

         14. OPTION TO PARTICIPATE IN EXPLORATORY WELLS. Upon the Closing, HHOC,
for the same consideration provided in Section 2 above, grants to Purchaser the
right (exercisable as provided below in this Section 14) to participate, in an
amount up to twenty-five percent (25%) of the (31.25%) working interest of HHOC
as to depths including and below the top of the Wilcox formation underlying the
"Seismic Area" established pursuant to the Exploration Agreement (the "Option
Area"), in the risk, liability, and expense of the drilling of each initial well
proposed by HHOC or any of the other parties to the Exploration Agreement (an
"Option Area Initial Well") to establish production of Hydrocarbons from the
portion of the Option Area covered by the operating agreement entered into among
HHOC and the other parties to the Exploration Agreement, pursuant to applicable
provisions of the Exploration Agreement, to govern operations on such portion of
the Option Area (an "Option Area Operating Agreement") and earn an equivalent
interest in the portion of the Option Area covered by the relevant Option Area
Operating Agreement (the "Designated Option Area Acreage") by bearing a
proportionate share of the risk, liability, and expense to HHOC to drill the
relevant Option Area Initial Well and test such well prior to making an election
to attempt to complete such well as a well capable of producing Hydrocarbons in
commercial quantities, subject, however, to the right of HHOC, as to each Option
Area Initial Well, to elect, pursuant to applicable provisions of the relevant
Option Area Operating Agreement, not to participate in the drilling of the
relevant Option Area Initial Well, in which case, as to any Option Area Initial
Well, Purchaser shall have no right to participate in such Option Area Initial
Well or the relevant Designated Option Area Acreage.

         Should HHOC propose, or receive notice from another party to the
Exploration Agreement or the relevant Option Area Operating Agreement proposing,
the drilling of an Option Area Initial



<PAGE>   24


Hall-Houston Oil Company et al.
November 20, 1998
Page 24



Well, HHOC shall provide to Purchaser promptly a copy of the proposal for such
Option Area Initial Well. Purchaser shall have the right, exercisable by written
notice to HHOC within fifteen (15) days of receipt from HHOC of a copy of the
proposal for the relevant Option Area Initial Well, to exercise the option
granted to Purchaser in the immediately preceding paragraph of this Section 14,
which notice to HHOC shall state the extent of the portion (stated as a
percentage and not exceeding 25%) of the working interest of HHOC in the
relevant Designated Option Area Acreage which Purchaser elects to bear in
connection with the drilling of the relevant Option Area Initial Well (the
"Participation Percentage"). Failure of Purchaser to respond to HHOC within the
time period provided in the immediately preceding sentence of this Section 14
shall constitute an election by Purchaser not to participate in the drilling of
the relevant Option Area Initial Well.

         Should Purchaser elect, or be deemed to have elected (pursuant to the
final sentence of the immediately preceding paragraph of this Section 14), not
to participate in the drilling of any Option Area Initial Well, then,
notwithstanding any provision of the relevant Option Area Operating Agreement to
the contrary, Purchaser shall have no further right with respect to the relevant
Designated Option Area Acreage or any operations thereon.

         Should Purchaser exercise, in connection with the drilling of any
Option Area Initial Well, the option granted to Purchaser in the first paragraph
of this Section 14, then should any party to the relevant Option Area Operating
Agreement elect not to participate in the drilling of such Option Area Initial
Well, Purchaser shall also be entitled to acquire from HHOC up to twice the
relevant Participation Percentage of the interest of any such non-participating
party available to HHOC on the basis of HHOC's working interest in the relevant
Designated Option Area Acreage prior to giving effect to the election by
Purchaser to exercise the option granted to Purchaser in the first paragraph of
this Section 14. HHOC shall provide to Purchaser promptly notice of the
aggregate interest available to HHOC as the result of the election of other
parties to the relevant Option Area Operating Agreement not to participate in
the drilling of the relevant Option Area Initial Well. Purchaser shall,
thereafter, provide to HHOC, within fifteen (15) days of receipt by Purchaser of
such notice from HHOC, notice of the portion (stated as a percentage and not
exceeding twice the relevant Participation Percentage) of the aggregate interest
available to HHOC as the result of the election of other parties to the relevant
Option Area Operating Agreement not to participate in the drilling of the
relevant Option Area Initial Well which Purchaser elects to acquire. Failure of
Purchaser to respond to HHOC within the time period provided in the immediately
preceding sentence of this Section 14 shall constitute an election by Purchaser
not to acquire from HHOC any portion of the aggregate interest available to HHOC
as the result of the election of other parties to the relevant Option Area
Operating Agreement not to participate in the drilling of the relevant Option
Area Initial Well.



<PAGE>   25


Hall-Houston Oil Company et al.
November 20, 1998
Page 25



         Upon an election by Purchaser to exercise, as to any Option Area
Initial Well, the option granted to Purchaser in the first paragraph of this
Section 14, HHOC shall execute and deliver to Purchaser an assignment, in form
and substance mutually acceptable to HHOC and Purchaser, of the relevant
Participation Percentage of the working interest of HHOC in the relevant
Designated Option Area Acreage. Each such assignment by HHOC to Purchaser shall
be made subject to the Exploration Agreement and the relevant Option Area
Operating Agreement and to a proportionate share of lessor's royalty and all
other burdens on the interest of HHOC in the relevant Designated Option Area
Acreage. All operations on the relevant Designated Option Area Acreage shall be
conducted in accordance with the relevant Option Area Operating Agreement, but
giving effect to such assignment by HHOC to Purchaser and any election by
Purchaser to acquire a portion of the aggregate interest available to HHOC as
the result of the election of other parties to the relevant Option Area
Operating Agreement not to participate in the drilling of the relevant Option
Area Initial Well.

         15. DISPUTE RESOLUTION. Any dispute relating to performance hereunder
shall be finally settled by arbitration in Houston, Texas, in accordance with
the Commercial Arbitration Rules of the American Arbitration Association, and
judgment upon the award rendered by the arbitrator(s) may be entered in any
court having jurisdiction thereof.

         16. MISCELLANEOUS.

                  (a) NOTICES. Any notice required to be given pursuant to this
         Agreement shall be in writing and shall be delivered in person, or by
         private courier service, with written receipt of acceptance returned to
         the sender, or via registered or certified mail, return receipt
         requested, postage prepaid, or by telecopier (with confirmation of
         receipt by telecopier sent by the recipient to the sender within two
         hours of completion of transmission with the result that, if there is
         no such confirmation of receipt by telecopy, the original notice sent
         by telecopier shall not be deemed effective notice) to each of the
         relevant parties at the address, or at the telecopier number, set forth
         in the letterhead or inside address of this Agreement, as the case may
         be.

                  (b) GOVERNING LAW. This Agreement and all issues of
         interpretation or performance shall be governed by and construed under
         the laws of the State of Texas.

                  (c) SUCCESSORS AND ASSIGNS. This Agreement shall be binding
         upon the parties hereto and their respective successors and assigns;
         provided, however, prior to the Closing, Purchaser shall have no right
         to assign any rights or delegate any obligations of Purchaser



<PAGE>   26


Hall-Houston Oil Company et al.
November 20, 1998
Page 26



         hereunder without the prior written consent of Sellers, which consent
         may be withheld for any reason or for no reason. After the Closing,
         Purchaser shall have no right to assign any rights or delegate any
         obligations of Purchaser under Section 13 or Section 14 above without
         the prior written consent of HHOC, which consent may be withheld for
         any reason or for no reason and Purchaser shall have no right to assign
         any rights or delegate any obligations with respect to the Subject
         Interests or any interest earned by Purchaser in the Option Area
         pursuant to Section 14 above except in compliance with applicable
         provisions of the Exploration Agreement (including, but not limited to,
         Article VIII thereof) and any applicable operating agreement.

                  (d) CONTROLLING AGREEMENT. In the event of any conflict
         between the provisions of this Agreement and those of the Assignment,
         the provisions of this Agreement shall be controlling. Notwithstanding
         the foregoing, provisions contained in the Assignment not addressed in
         this Agreement shall not be deemed in conflict with this Agreement and
         shall be given full force and effect.

                  (e) SEVERABILITY. All provisions herein are severable and in
         the event any one of them shall be held invalid by any court of
         competent jurisdiction, this Agreement shall be interpreted as if such
         invalid provision was not contained herein.

                  (f) HEADINGS. The headings of the sections of this Agreement
         are inserted for convenience only and shall not be deemed to constitute
         a part of this Agreement.

                  (g) ATTORNEY'S FEES. Subject to the provisions of Section 15
         above, if any action at law or in equity, including, without
         limitation, any arbitration pursuant to the provisions of Section 15
         above, is instituted by any party hereto to enforce or interpret the
         terms of this Agreement, then the prevailing party in such action shall
         be reimbursed all reasonable attorney's fees and other costs,
         including, but not limited to, expenses incurred by such prevailing
         party in such action.

                  (h) WAIVERS. No waiver of any condition of this Agreement
         shall be valid unless it is in writing.

                  (i) RECORDS AND DATA. Within 30 days after the Closing Date,
         Sellers shall deliver to Purchaser at Purchaser's offices (and at
         Purchaser's expense) such original documents and copies of documents as
         Sellers have in their possession (other than the Subject Data) that
         pertain to the Subject Interests and are not subject to confidentiality
         or other prohibitions on



<PAGE>   27


Hall-Houston Oil Company et al.
November 20, 1998
Page 27



         their delivery to Purchaser; provided, however, Sellers shall be
         entitled to make (at Sellers' expense) and retain copies of such
         documents delivered to Purchaser and Sellers shall not be required to
         deliver original documents relating to books of account and income tax
         matters, but may provide Purchaser with copies thereof. Purchaser shall
         retain the documents delivered to it pursuant to this Section 16(i) for
         a reasonable amount of time, and shall make such documents available to
         Sellers upon reasonable notice at Purchaser's offices at reasonable
         times and during normal business hours. In the event that Purchaser
         transfers the Subject Interests to any third party and includes in such
         transfer the documents delivered to it by Sellers, such transfer shall
         be made subject to the rights to access to such documents reserved in
         Sellers in this Agreement and any such transferee shall be obligated to
         continue to observe the rights of Sellers as set forth in this Section
         16(i) for the period prescribed herein.

                  (j) AMENDMENTS. No amendment or modification of this Agreement
         shall be deemed effective unless and until executed in writing by all
         of the parties hereto.

                  (k) TIME OF ESSENCE. The parties hereto agree and understand
         that time is of the essence in the performance of this Agreement and
         the obligations of the parties hereto created hereunder.

                  (l) COUNTERPART EXECUTION. This Agreement may be executed in
         any number of counterparts, each of which shall be considered an
         original for all purposes.

                  (m) NO NEGOTIATIONS. During the period beginning on the date
         hereof and ending on the earlier of (i) the Closing or (ii) the
         termination of this Agreement, in connection with any effort on the
         part of Seller to find a buyer of the Subject Interests, Sellers will
         not approve or undertake any transaction involving directly or
         indirectly all or any portion of the Subject Interests (a "Restricted
         Transaction"), unless in connection with such transaction Purchaser is
         promptly notified and Purchaser determines that its rights under this
         Agreement will not be impaired. Upon the termination of this Agreement,
         Seller shall have the right to resume its efforts to find a buyer for
         all or any portion of the Subject Interests without any further
         obligation to Purchaser hereunder.

                  (n) FURTHER ASSURANCES. Following the Closing, Sellers and
         Purchaser agree to take such other and further actions and to execute
         and deliver such other and further documents as may be required or
         advisable to carry out the purposes and intent of this Agreement.



<PAGE>   28


Hall-Houston Oil Company et al.
November 20, 1998
Page 28



                  (o) SURVIVAL OF AGREEMENT. The provisions of this Agreement
         shall survive the Closing and shall not be deemed merged into the
         Assignment and the other documents executed and delivered at the
         Closing.

                  (p) EXPLORATION AGREEMENT AND OTHER SUBJECT CONTRACTS. Upon
         the Closing, Purchaser expressly agrees to assume and perform (and to
         indemnify all Seller Indemnitees with respect to) all obligations of
         HHOC under any of the Subject Contracts arising from operation of the
         Subject Leases or the pipelines located on the Subject Easements on and
         after the Closing Date. In addition, upon the Closing, Purchaser
         accepts the Subject Interests subject to the Exploration Agreement
         (provided that Purchaser shall have no rights thereunder) and, in
         particular, agrees to be bound by and to comply with the provisions of
         Section 5.2 (to the extent of the entire "Seismic Area" established
         pursuant to the Exploration Agreement, notwithstanding that the Subject
         Leases cover a lesser area and only limited depths underlying such
         lesser area, and with the understanding that Purchaser shall be
         obligated to offer to HHOC and the other parties to the Exploration
         Agreement the right to acquire one hundred percent (100%) of the
         interest acquired by Purchaser in any oil and gas lease or oil, gas,
         and mineral lease covering lands within such "Seismic Area" and that,
         if HHOC and the other parties to the Exploration Agreement exercise
         their option pursuant to such Section 5.2, Purchaser shall have no
         remaining interest in the relevant oil and gas lease or oil, gas, and
         mineral lease), Article VII, and Article VIII of the Exploration
         Agreement; provided, however, no party to the Exploration Agreement
         shall have any right under Section 5.2 of the Exploration Agreement as
         the result of the closing of the transactions contemplated herein,
         including, without limitation, execution and delivery by Sellers to
         Purchaser of the Assignment.

                  (q) NO AGENCY, JOINT VENTURE OR PARTNERSHIP. The parties to
         this Agreement agree that this Agreement establishes no agency, joint
         venture or partnership, and that no party hereto shall incur
         obligations in the name of any other party hereto, or be obligated in
         respect of any obligation of any other party hereto without the prior
         written consent of such other party.

                  (r) PUBLICITY. Sellers and Purchaser shall consult with each
         other with regard to all publicity and other releases issued at or
         prior to the Closing concerning this Agreement and the transactions
         contemplated hereby and, except as required by applicable law or the
         applicable rules or regulations of any governmental body or stock
         exchange, no party shall issue any public statement or other release
         without the prior written consent of the other party or parties hereto,
         which consent shall not be unreasonably withheld.



<PAGE>   29


Hall-Houston Oil Company et al.
November 20, 1998
Page 29



         If the foregoing accurately sets forth our agreement, please execute a
copy of this Agreement in the space provided below.


                                         Yours very truly,

                                         CARRIZO OIL & GAS, INC.



                                         By:
                                            -----------------------------------
                                         Printed Name:
                                                      -------------------------
                                         Title:
                                               --------------------------------

                                         AGREED TO AND ACCEPTED as of
                                         the 20th day of November, 1998

                                         HALL-HOUSTON OIL COMPANY


                                         By:
                                            -----------------------------------
                                                Gary L. Hall
                                                Chairman and Chief Executive 
                                                Officer

                                         HALL-HOUSTON 1996 EXPLORATION AND
                                         DEVELOPMENT FACILITY OVERRIDING
                                         ROYALTY TRUST


                                         By:
                                            -----------------------------------
                                                Gary L. Hall
                                                Trustee


                                         By:
                                            -----------------------------------
                                                Wayne P. Hall


<PAGE>   30


Hall-Houston Oil Company et al.
November 20, 1998
Page 30


                                         Trustee

                                         HALL-HOUSTON OIL COMPANY EMPLOYEE
                                         ROYALTY TRUST


                                         By:
                                            -----------------------------------
                                                Gary L. Hall
                                                Trustee


                                         By:
                                            -----------------------------------
                                                Wayne P. Hall
                                                Trustee




<PAGE>   31




         As permitted by Item 601(b)(2) of Regulation S-K, the Company has not 
filed any exhibits with this Exhibit No. 2.1.  Listed below is a brief 
description of the omitted exhibits.  The Company agrees to furnish 
supplementally a copy of any of such omitted exhibits to the Commission upon 
request.



Exhibits
- --------

A-1   Oil and Gas Wells
A     Oil and Gas Leases
B     Easements
C     Assignment


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