1
            _______________________________________________________



                                $100,000,000


                              CREDIT AGREEMENT

                                 dated as of

                               March 10, 1998

                                    among

                    UNION TEXAS PETROLEUM HOLDINGS, INC.

                           The BANKS Listed Herein

                                     and

                         NATIONSBANK OF TEXAS, N.A.
                                  as Agent

                                     and

           BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION
                  UNION BANK OF SWITZERLAND, HOUSTON AGENCY
                                as Co-Agents

                                      
         THE INDEMNIFICATION PROVISIONS OF SECTIONS 7.06 AND 9.03(b) OF 
         THIS AGREEMENT INCLUDE INDEMNIFICATION FROM THE CONSEQUENCES OF 
         THE NEGLIGENCE OF THE PERSONS INDEMNIFIED THEREBY TO THE EXTENT
         SET FORTH THEREIN


    _______________________________________________________________________
   2
                               TABLE OF CONTENTS



                                                                                                                     Page

                                                        ARTICLE I
                                                                                                                 
                                           DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         SECTION 1.01.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         SECTION 1.02.  Accounting Terms and Determinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         SECTION 1.03.  Types of Borrowings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         SECTION 1.04.  Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         SECTION 1.05.  Unimar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
         SECTION 1.06.  Ratings.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19

                                                        ARTICLE II

                                           THE CREDITS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 2.01.  Commitments to Lend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 2.02.  Notice of Borrowings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 2.03.  Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         SECTION 2.04.  Notice to Banks; Funding of Loans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         SECTION 2.05.  Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
         SECTION 2.06.  Maturity of Loans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
         SECTION 2.07.  Interest Rates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
         SECTION 2.08.  Facility Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
         SECTION 2.09.  Optional Termination or Reduction of Commitments  . . . . . . . . . . . . . . . . . . . . . .  25
         SECTION 2.10.  Mandatory Termination or Reduction of Commitments . . . . . . . . . . . . . . . . . . . . . .  25
         SECTION 2.11.  Optional Prepayments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
         SECTION 2.12.  General Provisions as to Payments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
         SECTION 2.13.  Funding Losses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
         SECTION 2.14.  Computation of Interest and Fees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         SECTION 2.15.  Chapter 15  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         SECTION 2.16.  Maximum Interest Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         SECTION 2.17.  Taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28

                                                       ARTICLE III

                                           CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         SECTION 3.01.  Initial Borrowing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         SECTION 3.02.  All Borrowings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32

   3


                                                        ARTICLE IV
                                                                                                                 
                                           REPRESENTATIONS AND WARRANTIES . . . . . . . . . . . . . . . . . . . . . .  32
         SECTION 4.01.  Corporate Existence and Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
         SECTION 4.02.  Corporate and Governmental Authorization; Contravention . . . . . . . . . . . . . . . . . . .  32
         SECTION 4.03.  Binding Effect  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
         SECTION 4.04.  Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
         SECTION 4.05.  Litigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
         SECTION 4.06.  Compliance with ERISA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
         SECTION 4.07.  Environmental Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
         SECTION 4.08.  Subsidiaries  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
         SECTION 4.09.  Ownership of Restricted Subsidiaries  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
         SECTION 4.10.  Title to Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
         SECTION 4.11.  Taxes and Other Obligations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  35
         SECTION 4.12.  Regulation U  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
         SECTION 4.13.  Certain Obligations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
         SECTION 4.14.  United Kingdom Assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36

                                                        ARTICLE V

                                           COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
         SECTION 5.01.  Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  36
         SECTION 5.02.  Affirmative Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
         SECTION 5.03.  Primary Business  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
         SECTION 5.04.  Insurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
         SECTION 5.05.  Debt  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
         SECTION 5.06.  Restricted Payments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
         SECTION 5.07.  Negative Pledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
         SECTION 5.08.  Consolidations and Mergers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         SECTION 5.09.  Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         SECTION 5.10.  Addition of Guarantors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         SECTION 5.11.  Restrictions on Dividends, Intercompany Loans, or Investments . . . . . . . . . . . . . . . .  44
         SECTION 5.12.  Loans and Advances  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
         SECTION 5.13.  Cross-Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
         SECTION 5.14.  Subsidiaries  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
         SECTION 5.15.  Adjusted Equity and Interest Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
         SECTION 5.16.  Excluded Subordinated Debt and Preferred Stock  . . . . . . . . . . . . . . . . . . . . . . .  45
         SECTION 5.17.  Certain Obligations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
         SECTION 5.18.  Restrictions on Asset Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
         SECTION 5.19.  Conversion to Unrestricted Subsidiary . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46

                                                        ARTICLE VI

                                           DEFAULTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
         SECTION 6.01.  Events of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46






   4

                                                                                                                 
         SECTION 6.02.  Notice of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49

                                                       ARTICLE VII

                                           THE AGENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.01.  Appointment and Authorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.02.  Agent and Affiliates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.03.  Action by Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.04.  Consultation with Experts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.05.  Liability of Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         SECTION 7.06.  Indemnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         SECTION 7.07.  Credit Decision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         SECTION 7.08.  Successor Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         SECTION 7.09.  Agent's Fees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51

                                                       ARTICLE VIII

                                           CHANGE IN CIRCUMSTANCES  . . . . . . . . . . . . . . . . . . . . . . . . .  51
         SECTION 8.01.  Basis for Determining Interest Rate Inadequate or Unfair  . . . . . . . . . . . . . . . . . .  51
         SECTION 8.02.  Illegality  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
         SECTION 8.03.  Increased Cost and Reduced Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
         SECTION 8.04.  Base Rate Loans Substituted for Affected Euro-Dollar Loans  . . . . . . . . . . . . . . . . .  53
         SECTION 8.05.  Substitution of Bank  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54

                                                        ARTICLE IX

                                           MISCELLANEOUS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
         SECTION 9.01.  Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
         SECTION 9.02.  No Waivers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55
         SECTION 9.03.  Expenses; Indemnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  55
         SECTION 9.04.  Sharing of Set-Offs, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
         SECTION 9.05.  Amendments and Waivers  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  56
         SECTION 9.06.  Successors and Assigns  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  57
         SECTION 9.07.  Collateral  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
         SECTION 9.08.  Texas Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
         SECTION 9.09.  CONSENT TO JURISDICTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  58
         SECTION 9.10.  Counterparts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
         SECTION 9.11.  WAIVER OF JURY TRIAL  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
         SECTION 9.12.  COMPLETE AGREEMENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
         SECTION 9.13.  Liability of Co-Agents and Arranger . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  59
         SECTION 9.14.  Termination of 1997 Short-Term Commitments  . . . . . . . . . . . . . . . . . . . . . . . . .  59






   5
                                CREDIT AGREEMENT


                 Credit Agreement dated as of March 10, 1998 among Union Texas
Petroleum Holdings, Inc., the Banks party hereto, NationsBank of Texas, N.A.,
as Agent, and Bank of America National Trust and Savings Association and Union
Bank of Switzerland, Houston Agency, as Co-Agents.

                 The parties hereto agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

                 SECTION 1.01.  Definitions.  The following terms, as used
herein, have the following meanings:

                 "Acceptable Engineer" means DeGolyer & MacNaughton or such
other independent engineering firm that is mutually acceptable to the Agent and
the Company.

                 "Adjusted Equity" means the consolidated stockholders equity
of the Company and its Consolidated Subsidiaries, as determined on a
consolidated basis in accordance with generally accepted accounting principles,
adjusted to exclude (i) any cumulative foreign exchange translation
adjustments, (ii) any non-cash write-up or writedown of any assets of the
Company and its Consolidated Subsidiaries made after March 31, 1995 in
accordance with generally accepted accounting principles, and (iii) the
non-cash effect of the adoption of any change after March 31, 1995 required by
generally accepted accounting principles.

                 "Administrative Questionnaire" means, with respect to each
Bank, an administrative questionnaire in the form requested by the Agent
submitted to the Agent (with a copy to the Company) duly completed by such
Bank.

                 "Affiliate" means (i) any Person holding 5% or more of any
class of capital stock of the Company, and (ii) any Person (other than the
Company, a Subsidiary or a Partnership) directly or indirectly controlling,
controlled by or under common control with any Person described in clause (i).
As used in this definition of "Affiliate", the term "control" means the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of a Person, whether through ownership
of voting securities, by contract or otherwise.

                 "Agent" means NationsBank in its capacity as agent for the
Banks hereunder and any successor in such capacity.

                 "Agreement" means this Credit Agreement dated as of March 10,
1998 among the Company, the Banks, the Agent and the Co-Agents, as amended from
time to time in accordance with the terms hereof.





                                       1
   6
                 "Applicable Lending Office" means, with respect to any Bank,
(i) in the case of its Base Rate Loans, its Domestic Lending Office, and (ii)
in the case of its Euro-Dollar Loans, its Euro-Dollar Lending Office.

                 "Applicable Margin" means, for any Interest Period for each
Euro-Dollar Loan, the rate per annum applicable to such Euro-Dollar Loan during
such Interest Period, as shown on Schedule I and based on the Rating Level in
effect on the first day of such Interest Period.

                 "Arranger" means NationsBanc Capital Markets, Inc.

                 "Asset Sale" means any sale, lease, transfer or other
disposition of any Restricted Asset by the Company or any Restricted
Subsidiary, whether such sale, lease, transfer or other disposition is direct
or indirect (such as by selling capital stock of the Subsidiary that owns such
Restricted Asset, but excluding sales of capital stock of the Company), other
than (i) farm-outs in the ordinary course of business of properties containing
substantially no proved reserves at the time of the farm-out, (ii) sales in the
ordinary course of business of Hydrocarbons after severance, (iii) sales,
transfers, leases or other dispositions of inventory and obsolete or surplus
equipment in the ordinary course of business, and (iv) sales, transfers, leases
or other dispositions to the Company or any Restricted Subsidiary if no Default
then exists or would result therefrom.

                 "Assignee" has the meaning set forth in Section 9.06(c).

                 "Assignment" means an Assignment and Assumption Agreement in
substantially the form of Exhibit B hereto.

                 "Bank" means each bank listed on the signature pages hereof,
each Assignee which becomes a Bank pursuant to Section 9.06(c), and their
respective successors.

                 "Base Rate" means, for any day, a rate per annum equal to the
higher of (i) the Corporate Base Rate for such day and (ii) the sum of 1/2 of
1% plus the Federal Funds Rate for such day.

                 "Base Rate Loan" means a Loan which bears interest as provided
in Section 2.07(a).

                 "Benefit Arrangement" means at any time an employee benefit
plan within the meaning of Section 3(3) of ERISA which is not a Plan or a
Multiemployer Plan and which is maintained or otherwise contributed to by any
member of the ERISA Group.

                 "Borrowing" has the meaning set forth in Section 1.03.

                 "Cash Interest Expense" means, for any period, the sum of (i)
the aggregate amount accrued during such period by the Company and its
Consolidated Subsidiaries for interest determined on a consolidated basis, but
excluding interest on Non-Recourse Debt and interest on Debt of Unrestricted
Subsidiaries to the extent such Debt does not constitute Debt of the Company or
any Restricted Subsidiary plus (ii) the aggregate amount paid during such
period by the Company





                                       2
   7
and its Consolidated Subsidiaries for dividends on Restricted Preferred Stock,
determined on a consolidated basis.

                 "Co-Agents" means Bank of America National Trust and Savings
Association and Union Bank of Switzerland, Houston Agency in their capacities
as Co-Agents hereunder.

                 "Commitment" means, with respect to each Bank, the amount set
forth opposite the name of such Bank on the signature pages hereof (or, if such
Bank is an Assignee and its name is not set forth on the signature pages
hereof, the amount of its Commitment as set forth in the Assignment pursuant to
which it became a Bank), as such amount may be reduced from time to time
pursuant to Sections 2.09 and 2.10 or reduced or increased from time to time
pursuant to any Assignment to which it is a party.

                 "Company" means Union Texas Petroleum Holdings, Inc., a
Delaware corporation.

                 "Company's 1997 Form 10-K" means the Company's annual report
on Form 10-K for 1997, as filed with the Securities and Exchange Commission
pursuant to the Securities Exchange Act of 1934.

                 "Consolidated Debt" means, at any date, an amount equal to (a)
the sum (without duplication) of (i) the aggregate amount of Debt (other than
Defeased Debt, Excluded Subordinated Debt not exceeding $100,000,000 and Debt
that would not constitute Debt of the Company or any of its Consolidated
Subsidiaries if clause (viii) were not included in the definition herein of
Debt) of the Company and its Consolidated Subsidiaries, determined on a
consolidated basis as of such date, plus (ii) the Unimar Percentage at such
date of the aggregate Debt (other than Defeased Debt and Debt that would not
constitute Debt of Unimar or any of the Unimar Restricted Subsidiaries if
clause (viii) were not included in the definition herein of Debt) of Unimar and
the Unimar Restricted Subsidiaries, determined on a consolidated basis as of
such date, plus (iii) the Excess Letter of Credit/Guarantee Amount at such
date, minus (b) the sum (without duplication and only to the extent that any of
the following are included in the foregoing clause (a)) at such date of (1)
Debt of Unrestricted Subsidiaries to the extent such Debt does not constitute
Debt of the Company or any Restricted Subsidiary plus (2) Non-Restricted Asset
Non-Recourse Debt plus (3) Existing Pakistan Non-Recourse Debt.

                 "Consolidated Subsidiary" means at any date any Subsidiary or
other entity the accounts of which would be consolidated with those of the
Company in its consolidated financial statements as of such date.

                 "Convert", "Conversion" and "Converted" each refers to (i) the
change of Loans of one Type into Loans of the other Type pursuant to Section
2.03 or Article VIII, (ii) the continuation of all Euro-Dollar Loans comprising
the same Borrowing as such for an additional Interest Period pursuant to
Section 2.03, and (iii) an election to change, pursuant to Section 2.03, the
Interest Period applicable to all Euro-Dollar Loans comprising the same
Borrowing prior to the end of the Interest Period then applicable thereto.





                                       3
   8
                 "Corporate Base Rate" means a fluctuating interest rate per
annum as shall be in effect from time to time equal to the rate of interest
publicly announced by NationsBank as its base rate, whether or not the Company
has notice thereof.  Such rate is set by NationsBank as a general reference
rate of interest, taking into account such factors as NationsBank may deem
appropriate, it being understood that many of NationsBank's commercial or other
loans are priced in relation to such rate, that it is not necessarily the
lowest or best rate actually charged to any customer and that NationsBank may
make various commercial or other loans at rates of interest having no
relationship to such rate.

                 "Debt" of any Person means at any date, without duplication,
(i) all obligations of such Person for borrowed money, (ii) all obligations of
such Person evidenced by bonds, debentures, notes or other similar instruments,
(iii) all obligations of such Person to pay the deferred purchase price of
property or services, except accrued expenses, trade accounts payable and taxes
payable arising in the ordinary course of business, (iv) the present value,
determined in accordance with generally accepted accounting principles, of the
obligations of such Person to make payments under capital leases, (v) all
obligations of such Person which shall have been outstanding for more than five
days owed to a bank or other Person in respect of amounts theretofore paid
under a letter of credit or similar instrument, (vi) all Debt of others secured
by a Lien on any asset owned by such Person whether or not such Debt is assumed
by such Person (except that Joint Venture Debt shall for purposes of this
Agreement be deemed to be Debt of Pertamina and not of the Company or a
Subsidiary), (vii) all Restricted Preferred Stock issued by such Person or as
to which such Person is otherwise liable, (viii) all Debt of others Guaranteed
by such Person, to the extent of such Guarantee, and (ix) all obligations of
such Person which have been outstanding for more than five days to pay any
margin call (or similar requirement) on any Derivative Transaction (excluding,
in the case of the Company and its Subsidiaries, such obligations not exceeding
$5,000,000 in the aggregate); provided that, neither Debt nor Guarantee
includes (a) obligations under leases other than capital leases and under bona
fide Derivative Transactions (except as provided in clause (ix) above) and
obligations with respect to take-or-pay payments theretofore received which
remain subject to cash settlement or make-up; (b) Debt of the Company or a
Subsidiary owing to the Company or a Subsidiary, except for Debt not eliminated
in consolidation pursuant to the proviso in Section 1.02; (c) obligations under
the Indonesian Participating Units; (d) any preferred stock that does not
constitute Restricted Preferred Stock; and (e) the existing agreements relating
to Joint Venture Debt set forth in the contracts described on Schedule V of the
parties thereto as to allocation of responsibility for damages caused by reason
of an act or failure to act by, or otherwise related to, any such party, or any
similar agreement hereafter entered into providing for a similar allocation of
liability in respect of similar actions or failures to act.  The amount of Debt
attributable to any Restricted Preferred Stock shall be the maximum
consideration required to be paid upon the purchase, retirement, redemption,
exchange, or conversion of the portion thereof constituting Debt (such
consideration, if other than cash, to be valued at the fair market value
thereof); provided that, in computing such consideration there shall be
excluded (A) any consideration payable solely in common stock of the Company;
(B) dividends to the extent such dividends do not materially exceed the
generally prevailing market rate (at the time of issuance of such Restricted
Preferred Stock) on preferred stock of comparable risk and maturity; and (C)
any premium payable upon any such purchase, retirement, redemption, exchange or
conversion only as a result of the exercise by the issuer of a call provision
exercisable only at the option of the issuer, if failure to exercise such
option





                                       4
   9
would not have an adverse effect on the Company or any Subsidiary pursuant to
the terms of any such Restricted Preferred Stock or any documents related
thereto.

                 "Default" means any condition or event which constitutes an
Event of Default or which with the giving of notice or lapse of time or both
would, unless cured or waived, become an Event of Default.

                 "Defeased Debt" means any Debt of the Company or any
Subsidiary (i) which has been defeased in accordance with the terms of the
applicable Debt instruments, (ii) which is deemed to be extinguished under
generally accepted accounting principles applicable to the Company or such
Subsidiary, and (iii) with respect to which the Agent has received a
certificate of an officer of the Company or such Subsidiary to the effect that
the requirements of clauses (i) and (ii) of this definition have been met as to
such Debt and such evidence, if any, in support of such certificate as the
Agent may reasonably request.

                 "Derivative Transactions" means foreign exchange transactions
and commodity, currency and interest rate swaps, floors, caps, collars, forward
sales, options, other similar transactions and combinations of the foregoing.

                 "Domestic Business Day" means any day except a Saturday,
Sunday or other day on which commercial banks in New York City, San Francisco
or Houston are authorized by law to close.

                 "Domestic Lending Office" means, as to each Bank, its office
located at its address set forth in its Administrative Questionnaire (or
identified in its Administrative Questionnaire as its Domestic Lending Office)
or such other office as such Bank may hereafter designate as its Domestic
Lending Office by notice to the Company and the Agent.

                 "EBITDA" means, for any period, the sum of (i) the
consolidated net income of the Company and its Consolidated Subsidiaries for
such period before non-cash non-recurring items, gains or losses on
dispositions of assets and the cumulative effect of changes in accounting
principles plus (ii) to the extent included in the determination of such
income, the consolidated charges for such period for interest, depreciation,
depletion and amortization plus (or, if there is a benefit from income taxes,
minus) (iii) to the extent included in the determination of such income, the
amount of the provision for or benefit from income taxes; provided that in
determining such consolidated net income, such consolidated charges and such
provision for or benefit from income taxes, there shall be excluded therefrom
(to the extent otherwise included therein) (a) the net income (or loss) of,
charges for interest, depreciation, depletion and amortization of, and such
provision for or benefit from income taxes of, any Person acquired by the
Company or a Subsidiary in a pooling-of-interest transaction for any period
prior to the date of such transaction, and (b) the net income (but not loss)
of, charges for interest, depreciation, depletion and amortization of, and such
provision for (but not benefit from) income taxes of, any Person which is
subject to any contractual restriction which prevents the payment of dividends
or the making of distributions on the capital stock or other ownership
interests of such Person to the extent of such contractual restrictions.





                                       5
   10
                 "Effective Date" means the date of this Agreement, which is
March 10, 1998.

                 "Engineering Report" means a report of an Acceptable Engineer
providing an estimate of the proved reserves of Hydrocarbons attributable to
the properties of the Company and the Restricted Subsidiaries.

                 "Environmental Laws" means any and all federal, state, local
and foreign statutes, laws, regulations, ordinances, rules, judgments, orders,
decrees, permits, concessions, grants, franchises, licenses, agreements or
other governmental restrictions relating to the environment or to emissions,
discharges or releases of pollutants, contaminants, petroleum or petroleum
products, chemicals or industrial, toxic or hazardous substances or wastes into
the environment including, without limitation, ambient air, surface water,
ground water, or land, or otherwise relating to the manufacture, processing,
distribution, use, treatment, storage, disposal, transport or handling of
pollutants, contaminants, petroleum or petroleum products, chemicals or
industrial, toxic or hazardous substances or wastes or the clean-up or other
remediation thereof, including, without limitation, the Comprehensive
Environmental Response, Compensation, and Liability Act, the Resource
Conservation and Recovery Act, the Oil Pollution Act, and their state analogs,
in each case as they have been or may be amended.

                 "ERISA" means the Employee Retirement Income Security Act of
1974, as amended, or any successor statute.

                 "ERISA Group" means the Company and all members of a
controlled group of corporations and all trades or businesses (whether or not
incorporated) under common control which, together with the Company, are
treated as a single employer under Section 414 of the Internal Revenue Code.

                 "Euro-Dollar Business Day" means any Domestic Business Day on
which commercial banks are open for international business (including dealings
in dollar deposits) in London.

                 "Euro-Dollar Lending Office" means, as to each Bank, its
office, branch or affiliate located at its address set forth in its
Administrative Questionnaire (or identified in its Administrative Questionnaire
as its Euro- Dollar Lending Office) or such other office, branch or affiliate
of such Bank as it may hereafter designate as its Euro- Dollar Lending Office
by notice to the Company and the Agent.

                 "Euro-Dollar Loan" means a Loan which bears interest as
provided in Section 2.07(b).

                 "Event of Default" has the meaning set forth in Section 6.01.





                                       6
   11
                 "Excess Letter of Credit/Guarantee Amount" means, at any date,
the excess of (a) the sum of (i) the aggregate undrawn amount, at such date, of
all letters of credit as to which the Company or any Restricted Subsidiary
(other than Unimar and the Unimar Restricted Subsidiaries) is the account party
or in respect of which the Company or any Restricted Subsidiary (other than
Unimar and the Unimar Restricted Subsidiaries) has Guaranteed payment plus the
unpaid drawn portions, at such date, of all such letters of credit to the
extent such drawn portions do not constitute Debt of the Company or a
Restricted Subsidiary (other than Unimar and the Unimar Restricted
Subsidiaries), plus (ii) the Unimar Percentage of the aggregate undrawn amount,
at such date, of all letters of credit as to which Unimar or any of the Unimar
Restricted Subsidiaries is the account party or in respect of which Unimar or
any of the Unimar Restricted Subsidiaries has Guaranteed payment plus the
unpaid drawn portions, at such date, of such letters of credit to the extent
such drawn portions do not constitute Debt of Unimar or any of the Unimar
Restricted Subsidiaries, plus (iii) Debt that constitutes Debt of the Company
or any Restricted Subsidiary (other than Unimar or any Unimar Restricted
Subsidiary) pursuant to clause (viii) of the definition herein of Debt, plus
(iv) the Unimar Percentage at such date of Debt that constitutes Debt of Unimar
or any of the Unimar Restricted Subsidiaries pursuant to clause (viii) of the
definition herein of Debt, over (b) $50,000,000.

                 "Excess Net Sales Proceeds" means

         (i)     with respect to any Asset Sale involving, directly or
         indirectly, a UK Asset (a "UK Asset Sale"),

                 (a)      if, after giving effect to such Asset Sale, the
         aggregate Net Sales Proceeds from all UK Asset Sales since December 31,
         1993 would be less than or equal to $50,000,000 and the aggregate Net
         Sales Proceeds from all Asset Sales since such date would be less than
         or equal to $100,000,000, zero; or

                 (b)      if, after giving effect to such Asset Sale, the
         aggregate Net Sales Proceeds from all UK Asset Sales since December 31,
         1993 ("UK Aggregate Amount") would be greater than $50,000,000 or the
         aggregate Net Sales Proceeds from all Asset Sales since such date 
         ("Total Aggregate Amount") would be greater than $100,000,000, the 
         lesser of (1) the greater of the amount by which the UK Aggregate 
         Amount exceeds $50,000,000 or the amount by which the Total Aggregate
         Amount exceeds $100,000,000 or (2) the Net Sales Proceeds from such 
         Asset Sale; and

         (ii)    with respect to any Asset Sale not involving, directly or
         indirectly, a UK Asset,

                 (a)      if, after giving effect to such Asset Sale, the
         aggregate Net Sales Proceeds from all Asset Sales since December 31, 
         1993 would be less than or equal to $100,000,000, zero; or





                                       7
   12
                 (b)      if, after giving effect to such Asset Sale, the
        aggregate Net Sales Proceeds from all Asset Sales since December 31, 
        1993 would be greater than $100,000,000, the lesser of (1) the amount 
        by which such aggregate Net Sales Proceeds exceeds $100,000,000 or (2)
        the Net Sales Proceeds from such Asset Sale.

                 "Excluded Subordinated Debt" means Debt that (i) is
subordinate and junior, on terms reasonably satisfactory to the Agent, to the
Loans in all respects and (ii) has no requirement, absent a default under such
Debt, that any principal thereof be paid, purchased, redeemed, defeased,
acquired, exchanged or converted (other than exchange for or conversion to
common stock of the Company) prior to March 31, 2003.

                 "Existing Pakistan Non-Recourse Debt" means the Debt, not
exceeding the principal amount of $9,500,000, evidenced by that certain
promissory note dated December 20, 1988, issued by UT Pakistan in the original
principal amount of $21,250,000, the related Finance Agreement between UT
Pakistan and the Overseas Private Investment Corporation ("OPIC") and the
related Issuing and Paying Agency Agreement among First Trust New York National
Association (as successor to Morgan Guaranty Trust Company of New York) as
issuing and paying agent, OPIC and UT Pakistan.

                 "Fair Market Value" means with respect to any asset of the
Company or any Subsidiary at any date the open market cash purchase price that
an informed and willing purchaser would pay for such asset in an arm's length
transaction to a willing and informed owner under no compulsion to sell, all as
reasonably determined in good faith by the Company.

                 "Federal Funds Rate" means, for any day, the rate per annum
(rounded upwards, if necessary, to the nearest 1/100th of 1%) equal to the
weighted average of the rates on overnight Federal funds transactions with
members of the Federal Reserve System arranged by Federal funds brokers on such
day, as published by the Federal Reserve Bank of New York on the Domestic
Business Day next succeeding such day; provided that (i) if such day is not a
Domestic Business Day, the Federal Funds Rate for such day shall be such rate
on such transactions on the next preceding Domestic Business Day, as so
published on the next succeeding Domestic Business Day, and (ii) if no such
rate is so published on such next succeeding Domestic Business Day, the Federal
Funds Rate for such day shall be the average rate quoted to NationsBank on such
day on such transactions as determined by the Agent.

                 "Financing Documents" means this Agreement and the Notes.

                 "Guarantee" by any Person means any obligation, contingent or
otherwise (including, without limitation, any obligation to repay to a payor or
creditor of a payor amounts previously paid to such Person by such payor), of
such Person directly or indirectly guaranteeing any Debt of any other Person or
otherwise incurred for the purpose of assuring the holder of payment





                                       8
   13
of any such Debt; provided that (i) the obligations of any Person in respect of
Debt of any Partnership in which such Person is a general partner shall not
constitute a Guarantee of such Debt so long as substantially all assets of such
Person are comprised of its Investment in such Partnership, (ii) the obligation
of a Person to transfer or restore cash to the account of a Partnership,
Subsidiary or Affiliate pursuant to periodic settlements or adjustments under
cash management practices of such Persons shall not constitute a Guarantee,
(iii) the contractual obligation of a Person to assure that a Subsidiary,
Partnership or Affiliate conducts its operations as a prudent operator shall
not constitute a Guarantee of indebtedness of the Subsidiary, Partnership or
Affiliate, (iv) the obligation of a Person to cause net amounts of cash owned
by a Subsidiary, Partnership or Affiliate to be applied to payment of
indebtedness of such Subsidiary, Partnership or Affiliate shall not constitute
a Guarantee of such indebtedness and (v) the reaffirmation to or for the
benefit of a lender of contractual obligations (as, for example, those set
forth in the Production Sharing Contracts) previously entered into in good
faith and not in contemplation of the incurrence of Debt shall not constitute a
Guarantee so long as the other arrangements entered into in connection with
such reaffirmation do not increase the likelihood that additional funds will be
required to meet such obligations (as would be the case, for example, if
revenues otherwise available to meet such obligations were dedicated to such
lender).

                 "HPG Plant" means the five-twelfths interest in the Geismar,
Louisiana olefins plant owned by UTPC and its subsidiaries, the supply and
distribution assets related to such plant and all other operating assets of
UTPC and its subsidiaries as of December 31, 1993.

                 "Hydrocarbons" means crude oil, including all kinds of
hydrocarbons and bitumens in solid or liquid form, and natural gas, including
all gaseous hydrocarbons produced from wells, and liquefied natural gas and
liquefied petroleum gases.

                 "Indonesian Participating Units" means the Indonesian
Participating Units issued by Unimar pursuant to the Indenture dated as of
September 24, 1984 between Unimar and Irving Trust Company, Trustee, as amended
and in effect on May 13, 1994, and as thereafter amended to the extent such
subsequent amendments do not change the term thereof, provide additional
security therefor, or increase the payments to be made to holders thereof.

                 "Interest Period" means, with respect to each Euro-Dollar Loan
comprising part of the same Borrowing, the period commencing on the date of
such Loan or the date of the Conversion of any Base Rate Loan into such
Euro-Dollar Loan and ending on the last day of the period selected by the
Company pursuant to the provisions below and, thereafter, each subsequent
period commencing on the last day of the immediately preceding Interest Period
(or on any other date selected by the Company pursuant to Section 2.03) and
ending on the last day of the period selected by the Company pursuant to the
provisions below and Section 2.03.  The duration of each such Interest Period
shall be 1, 2, 3 or 6 months or (subject to Section 2.02(b)) 9 or 12 months, in
each case as the Company may, upon notice received by the Agent not later than
10:00 A.M. (Houston





                                       9
   14
time) on the third Euro-Dollar Business Day prior to the first day of such
Interest Period, select; provided that:

                 (a)      any Interest Period which would otherwise end on a
         day which is not a Euro-Dollar Business Day shall be extended to the
         next succeeding Euro-Dollar Business Day unless such Euro-Dollar
         Business Day falls in another calendar month, in which case such
         Interest Period shall end on the next preceding Euro-Dollar Business
         Day;

                 (b)      any Interest Period which begins on the last
         Euro-Dollar Business Day of a calendar month (or on a day for which
         there is no numerically corresponding day in the calendar month at the
         end of such Interest Period) shall end on the last Euro-Dollar
         Business Day of a calendar month;

                 (c)      the Company may not select an Interest Period for any
         Loan if the last day of such Interest Period would be after the
         Maturity Date; and

                 (d)      Interest Periods for all Loans comprising the same
         Borrowing shall commence on the same date and shall be of the same
         duration.

                 "Internal Revenue Code" means the Internal Revenue Code of
1986, as amended, or any successor statute.

                 "Investment" means any investment in any Person, whether by
means of share purchase, capital contribution, loan, advance, Guarantee or
otherwise.  It is understood that a joint operating agreement or similar
arrangement with respect to Hydrocarbon properties or the HPG Plant does not
constitute a Person and hence that payments in respect of the acquisition or
maintenance of an interest in such Hydrocarbon properties or the HPG Plant do
not constitute an Investment.

                 "Joint Venture Debt" means obligations secured by a Lien on
the interests of the Company or a Subsidiary, as the case may be, arising under
either of the Production Sharing Contracts or any related supply contracts, if
such Lien covers ratably the interests of Pertamina and all production sharing
contractors thereunder.

                 "Lien" means, with respect to any asset, any mortgage, lien,
pledge, charge, security interest or encumbrance of any kind in respect of such
asset (including, without limitation, any production payment, advance payment
or similar arrangement with respect to minerals in place), whether or not
filed, recorded or otherwise perfected under applicable law.  For the purposes
of this Agreement, the Company or any Subsidiary shall be deemed to own subject
to a Lien any asset which it has acquired or holds subject to the interest of a
vendor or lessor under any conditional sale agreement, capital lease or other
title retention agreement relating to such asset.  The right of set-off,





                                       10
   15
whether by operation of law or by contract, does not constitute a Lien unless
there is a related obligation to maintain a deposit of cash or other assets in
respect of which such right of set-off may be exercised.

                 "Loan" means a loan made by a Bank to the Company pursuant to
Section 2.01 and refers to a Base Rate Loan or a Euro-Dollar Loan (each of
which shall be a "Type" of Loan), and "Loans" means Base Rate Loans or
Euro-Dollar Loans or any combination of the foregoing.

                 "London Interbank Offered Rate" has the meaning set forth in
Section 2.07(b).

                 "material" means, with respect to any matter so characterized
herein, that such matter would reasonably be expected to be significant to a
Bank in determining whether to enter into this Agreement or to extend credit
hereunder.

                 "Material Debt" means Debt of the Company and/or any one or
more Restricted Subsidiaries (other than Non-Recourse Debt) in an aggregate
principal amount equal to or greater than $15,000,000, whether incurred under
one or more related or unrelated documents or instruments.

                 "Material Plan" means at any time a Plan or Plans having
aggregate Unfunded Liabilities in excess of $15,000,000.

                 "Maturity Date" has the meaning referred to in Section 2.06.

                 "Moody's" means Moody's Investors Service, Inc. or any
successor to its debt ratings business.

                 "Multiemployer Plan" means at any time an employee pension
benefit plan within the meaning of Section 4001(a)(3) of ERISA to which any
member of the ERISA Group is then making or accruing an obligation to make
contributions or has within the preceding five plan years made contributions,
including for these purposes any Person which ceased to be a member of the
ERISA Group during such five year period.

                 "NationsBank" means NationsBank of Texas, N.A., a national
banking association.

                 "Net Sales Proceeds" means, with respect to any Asset Sale,
the Fair Market Value of the Restricted Asset that is sold, leased, transferred
or otherwise disposed of in such Asset Sale, minus the sum of (i) all
reasonable fees, commissions and expenses incurred by the Company or any
Subsidiary as a result of or in connection with such Asset Sale and (ii) all
taxes required to be paid by the Company or any Subsidiary as a result of such
Asset Sale.





                                       11
   16
                 "Non-Recourse Debt" means, at any date, (a) the aggregate
amount at such date of Debt of the Company or a Subsidiary (other than Unimar
and each Unimar Subsidiary) and (b) the Unimar Percentage of the aggregate
amount at such date of all Debt of each of Unimar and each Unimar Subsidiary,
in respect of which in the case of either (a) or (b) (i) the recourse of the
holder of such Debt, whether direct or indirect and whether contingent or
otherwise, shall be effectively limited to Non-Restricted Assets (or, in the
case of the Existing Pakistan Non-Recourse Debt, the assets described in
Schedule III) and (ii) in the case of any such Debt incurred after the date of
this Agreement, the Company shall have, at or prior to the time of incurrence
thereof, notified the Agent of such incurrence and delivered to the Agent a
certificate of an officer of the Company certifying that such Debt constitutes
Non-Recourse Debt (or that such Debt will be converted into Non-Recourse Debt
at some specified time or upon the occurrence of some specified event);
provided that, if any such Debt is secured by any interest in a license,
concession, production sharing contract or other right and any of the
Restricted Assets consists of an interest in such license, concession,
production sharing contract or other right, then the agreements evidencing such
Debt must provide that default under such Debt will not impair or affect such
license, concession, production sharing contract or other right.  In the case
of any Non-Recourse Debt incurred after the date of this Agreement, such
limitation on recourse (i) must be set forth in the instrument evidencing such
Debt, and (ii) must be on terms acceptable to the Agent as evidenced by the
written approval thereof by the Agent (which approval will not be unreasonably
withheld, and in deciding whether to approve such terms the Agent will, if
requested by the Company, take into account what terms are usual and customary
in non-recourse financings) and in any event must provide that the holder of
such Debt waives, to the extent such holder may effectively do so, such
holder's right to elect recourse treatment under 11 U.S.C. Section  1111(b)
unless such holder obtains the prior written consent of the Required Banks.
For avoidance of doubt, (a) if any such Debt is Guaranteed by the Company or a
Restricted Subsidiary in a limited amount, the excess over such amount (but
only the excess) constitutes Non-Recourse Debt, and (b) Debt shall not be
determined to not be Non-Recourse Debt solely as a result of the existence of
either of the following: (i) an agreement by a direct or indirect parent
corporation to repay to a subsidiary amounts received by such parent
corporation from such subsidiary in the event such subsidiary has a need for
such amounts in future periods or (ii) an agreement by a direct or indirect
parent corporation to cause a subsidiary to comply with such subsidiary's
contractual obligations so long as the parent corporation is not obligated to
contribute funds to the subsidiary to enable it to comply with such contractual
obligations and has not otherwise Guaranteed such obligations.

                 "Non-Restricted Asset Non-Recourse Debt" means, at any date,
the aggregate amount at such date of Non-Recourse Debt as to which the
recourse of the holder is limited exclusively to Non-Restricted Assets as
contemplated by clause (i) of the first sentence of the definition of
Non-Recourse Debt.

                 "Non-Restricted Assets" means all assets of the Company and
its Subsidiaries other than Restricted Assets.





                                       12
   17
                 "Non-UK Asset" means any Restricted Asset other than a UK
Asset.

                 "Notes" means promissory notes of the Company, substantially
in the form of Exhibit A hereto, evidencing the obligation of the Company to
repay the Loans made to it, and "Note" means any one of such promissory notes
issued hereunder.

                 "Notice of Borrowing" has the meaning specified in Section
2.02.

                 "Operating Cash Flow" means, with respect to any period, an
amount equal to

                 (i) the "net cash (required) provided by operating activities
                 before changes in other assets and liabilities" of the Company
                 and its Consolidated Subsidiaries for such period, that should
                 be reflected in the consolidated statement of cash flows of
                 the Company and its Consolidated Subsidiaries for such period
                 prepared in accordance with generally accepted accounting
                 principles on substantially the same basis as the consolidated
                 statement of cash flows of the Company and its Consolidated
                 Subsidiaries for the year ended December 31, 1997 as set forth
                 in the Company's 1997 Form 10-K; provided that in determining
                 such "net cash (required) provided by operating activities
                 before changes in other assets and liabilities" there shall be
                 excluded therefrom (to the extent otherwise included therein)
                 (a) the portion of such net cash provided by assets securing
                 any Non-Recourse Debt other than the Existing Pakistan
                 Non-Recourse Debt, (b) the net cash provided or required by
                 operating activities before changes in other assets and
                 liabilities of any Person acquired by the Company or a
                 Subsidiary in a pooling-of-interest transaction for any period
                 prior to the date of such transaction, and (c) the net cash
                 provided by operating activities before changes in other
                 assets and liabilities of any Person which is subject to any
                 contractual restriction which prevents the payment of
                 dividends or the making of distributions on the capital stock
                 or other ownership interests of such Person to the extent of
                 such contractual restrictions,

                 plus (ii) to the extent included in the determination of the
                 "net cash (required) provided by operating activities before
                 changes in other assets and liabilities" for such period in
                 accordance with the foregoing clause (i), exploration expenses
                 incurred by the Company or any Consolidated Subsidiary during
                 such period other than (a) exploration expenses incurred in
                 connection with assets securing any Non-Recourse Debt other
                 than the Existing Pakistan Non-Recourse Debt, (b) the
                 exploration expenses of any Person acquired by the Company or
                 a Subsidiary in a pooling-of-interest transaction for any
                 period prior to the date of such transaction, and (c) the
                 exploration expenses of any Person which is subject to any
                 contractual restriction which prevents the payment of
                 dividends or the making of distributions on the capital stock
                 or other ownership interests of such Person to the extent of
                 such contractual restrictions,





                                       13
   18
                 plus (or, if cash is required by equity investee, minus) (iii)
                 the amount of the "cash (required) provided by equity
                 investee" of the Company and its Consolidated Subsidiaries for
                 such period, that should be reflected in the consolidated
                 statement of cash flows of the Company and its Consolidated
                 Subsidiaries for such period prepared in accordance with
                 generally accepted accounting principles on substantially the
                 same basis as the consolidated statement of cash flows of the
                 Company and its Consolidated Subsidiaries for the year ended
                 December 31, 1997 as set forth in the Company's 1997 Form
                 10-K, excluding the effect of any cash required by such equity
                 investee for the payment of the principal of its Debt and any
                 cash provided by such equity investee from incurrence of its
                 Debt,

                 minus (iv) dividends on preferred stock paid during such
                 period by the Company or any Consolidated Subsidiary,
                 determined on a consolidated basis.

                 "Other Credit Agreement" means the Second Amended and Restated
Credit Agreement dated as of March 29, 1996 among the Company, NationsBank, as
agent thereunder, and the co-agents and the banks parties thereto, as amended
by the First Amendment Agreement dated March 11, 1997, and as further amended
or otherwise modified from time to time, providing a $450,000,000 credit
facility to the Company.

                 "Other Credit Agreement Commitments" means the "Commitments"
as defined in the Other Credit Agreement.

                 "Parent" means, with respect to any Bank, any Person
controlling such Bank.

                 "Participant" has the meaning set forth in Section 9.06(b).

                 "Partnership" means any general or limited partnership which
is accounted for on the equity method in the Company's consolidated financial
statements and in which the Company or a Subsidiary is a general partner.

                 "PBGC" means the Pension Benefit Guaranty Corporation or any
entity succeeding to any or all of its functions under ERISA.

                 "Person" means an individual, a corporation, a partnership, an
association, a trust or any other entity or organization, including a
government or political subdivision or an agency or instrumentality thereof.
It is understood that a joint operating agreement or similar arrangement with
respect to Hydrocarbon properties or the HPG Plant does not constitute a
Person.

                 "Plan" means at any time an employee pension benefit plan
(other than a Multiemployer Plan) which is covered by Title IV of ERISA or
subject to the minimum funding standards under Section 412 of the Internal
Revenue Code and either (i) is maintained, or contributed





                                       14
   19
to, by any member of the ERISA Group for employees of any member of the ERISA
Group or (ii) has at any time within the preceding five years been maintained,
or contributed to, by any Person which was at such time a member of the ERISA
Group for employees of any Person which was at such time a member of the ERISA
Group.

                 "Production Sharing Contracts" means the production sharing
contracts pertaining to certain operations in Indonesia filed as Exhibits
10.102 and 10.103 to the Company's quarterly report on Form 10-Q for the
quarter ending June 30, 1990, as filed with the Securities and Exchange
Commission pursuant to the Securities Exchange Act of 1934.

                 "Rating Level" means the applicable category of rating level
contained in Schedule I (subject, however, to the footnotes on Schedule I),
based on the ratings of the senior unsecured long-term debt of the Company by
S&P or Moody's or both.

                 "Reference Banks" means the principal London offices of
NationsBank, Bank of America National Trust and Savings Association and Union
Bank of Switzerland and such substitute Bank or Banks as may be mutually agreed
to by the Company and the Agent, and "Reference Bank" means any one of such
Reference Banks.

                 "Regulation G" means Regulation G of the Board of Governors of
the Federal Reserve System, as in effect from time to time.

                 "Regulation U" means Regulation U of the Board of Governors of
the Federal Reserve System, as in effect from time to time.

                 "Required Banks" means at any time Banks having at least 51%
of the aggregate amount of the Commitments or, if the Commitments shall have
been terminated, holding Notes evidencing at least 51% of the aggregate unpaid
principal amount of the Loans.

                 "Restricted Assets" means (1) all proved reserves of the
Company and the Subsidiaries as of December 31, 1993 in Indonesia, the United
Kingdom (including the United Kingdom Sector of the North Sea) and Pakistan,
(2) all licenses, concessions, production sharing contracts and other rights
pertaining to any such proved reserves (excluding the portion thereof that does
not pertain to any of such proved reserves, if such portion can be severed
without material adverse consequences on the portion pertaining to such proved
reserves), (3) equipment used in the production of any such proved reserves or
in the transportation of production from any such proved reserves if such
equipment is a fixture or otherwise attached to realty, constitutes all or a
part of any pipeline or related equipment, is all or part of a production
platform or related equipment or is equipment similar to any of the foregoing
or used for a similar purpose, and (4) the HPG Plant.

                 "Restricted Payment" means (i) any dividend or other
distribution on any shares of the Company's capital stock (except dividends
payable solely in shares of its common stock), or





                                       15
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(ii) any payment on account of the purchase, redemption, retirement or
acquisition of (a) any shares of the Company's capital stock or (b) any option,
warrant or other right to acquire shares of the Company's capital stock (except
any such payment made solely in shares of its common stock); provided that
payments of stock-related and other employee benefits (including purchases by
the Company of its common stock in connection with the payment of such
benefits) in the ordinary course of business to employees of the Company or a
Subsidiary shall not be deemed Restricted Payments.

                 "Restricted Preferred Stock" means (i) all preferred stock
which (a) is subject to purchase, retirement, redemption, exchange or
conversion (other than exchange for or conversion to common stock of the
Company), in whole or in part under any circumstance whatsoever (other than
purchase, retirement, redemption, exchange or conversion by the issuer thereof,
at the sole option of such issuer, if failure to exercise such option would not
have an adverse effect on the Company or any Subsidiary pursuant to the terms
of any such preferred stock or any documents related thereto) and (b) provides
for dividends materially in excess of the generally prevailing market dividend
rate (at the time of issuance of such preferred stock) for preferred stock of
comparable risk and maturity, and (ii) the portion of all other preferred stock
which is subject to purchase, retirement, redemption, exchange or conversion
(other than exchange for or conversion to common stock of the Company) at any
date or dates on or prior to March 31, 2003 under any circumstance whatsoever
(other than purchase, retirement, redemption, exchange or conversion by the
issuer thereof, at the sole option of such issuer, if failure to exercise such
option would not have an adverse effect on the Company or any Subsidiary
pursuant to the terms of any such preferred stock or any documents related
thereto).  For avoidance of doubt, to the extent that any shares of Restricted
Preferred Stock are exchanged for or converted to common stock of the Company
and as a consequence such shares of Restricted Preferred Stock are cancelled,
such shares shall no longer constitute Restricted Preferred Stock.

                 "Restricted Subsidiaries Recourse Debt" means, at any date,
the sum of (a) the aggregate amount of all Debt (other than (i) Non-Recourse
Debt, (ii) any Guarantee of Debt of the Company (including the Loans) and (iii)
the amount, if any, by which the Guarantees of the Restricted Subsidiaries
(other than Unimar and the Unimar Restricted Subsidiaries) included in the
determination of Excess Letter of Credit/Guarantee Amount exceeds the Excess
Letter of Credit/Guarantee Amount) of each Restricted Subsidiary (other than
Unimar and the Unimar Restricted Subsidiaries), determined on a consolidated
basis as of such date, and (b) the Unimar Percentage of the aggregate amount of
all Debt (other than (i) Non-Recourse Debt, (ii) any Guarantee of Debt of the
Company and (iii) the amount, if any, by which the Unimar Percentage of the
Guarantees of Unimar and the Unimar Restricted Subsidiaries included in the
determination of Excess Letter of Credit/Guarantee Amount exceeds the Excess
Letter of Credit/Guarantee Amount) of Unimar and the Unimar Restricted
Subsidiaries, determined on a consolidated basis as of such date.





                                       16
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                 "Restricted Subsidiary" means each Person listed in Part B of
Schedule II hereto and each Subsidiary that owns directly or indirectly any
interest in any Restricted Assets or any Restricted Subsidiary; provided that a
Restricted Subsidiary shall cease to be such at such time as it is converted to
an Unrestricted Subsidiary pursuant to Section 5.19 or ceases to be a
Subsidiary as a result of a transaction permitted by Section 5.14.

                 "Restricted Transfer" means (i) any Investment in an
Affiliate, any Unrestricted Subsidiary or any subsidiary of an Unrestricted
Subsidiary, but excluding to the extent otherwise included in the foregoing,
Investments in Unimar and the Unimar Subsidiaries, or (ii) any payment by the
Company or any Subsidiary, directly or indirectly, in respect of Non-Recourse
Debt to the extent such Person is not legally obligated to make such payment by
the terms of such Debt, or solely in the case of Unimar, Unistar, Inc. or any
of the Unimar Subsidiaries, to the extent such Person is not legally obligated
to fund such payment under the terms of the Unimar Partnership Agreement.

                 "Revolving Credit Period" means the period from and including
the Effective Date to but not including the Termination Date.

                 "S&P" means Standard & Poor's Ratings Group, a division of
McGraw-Hill, Inc. or any successor to its debt rating business.

                 "Subsidiary" means (a) Unimar and the Unimar Subsidiaries
(except at such times as the Company does not own, directly or indirectly, any
of the ownership interest in Unimar) and (b) any corporation or other entity of
which securities or other ownership interests having ordinary voting power to
elect a majority of the board of directors or other persons performing similar
functions are at the time directly or indirectly owned by the Company, it being
understood that the power to elect exactly 50% of the board of directors or
such other persons does not constitute a "majority" as used herein.

                 "Termination Date" means March 9, 1999, or, if such day is not
a Euro-Dollar Business Day, the Termination Date shall be the next preceding
Euro-Dollar Business Day.

                 "Type" has the meaning specified in the definition of Loan.

                 "UK Assets" means all Restricted Assets of UTPL as of December
31, 1993.

                 "Unfunded Liabilities" means, with respect to any Plan at any
time, the amount (if any) by which (i) the present value of all benefits under
such Plan as determined by such Plan's actuary exceeds (ii) the fair market
value of all Plan assets allocable to such benefits (excluding any accrued but
unpaid contributions), all determined as of the then most recent valuation date
for such Plan, but only to the extent that such excess represents a potential
liability of a member of the





                                       17
   22
ERISA Group to the PBGC or any other Person under Title IV of ERISA if such
Plan terminated as of such date.

                 "Unimar" means Unimar Company, a partnership organized and
existing under the laws of Texas.

                 "Unimar Partnership Agreement" means the Amended and Restated
Agreement of General Partnership of Unimar dated as of September 11, 1990
between Unistar, Inc. and LASMO (USTAR) Inc. (formerly Ultrastar, Inc.), as
amended from time to time.

                 "Unimar Percentage" means, at any date, the aggregate
percentage ownership interest in Unimar owned at such date by the Company and
the Subsidiaries.

                 "Unimar Restricted Subsidiary" means any Unimar Subsidiary
that is also a Restricted Subsidiary at the relevant date.

                 "Unimar Subsidiary" means any corporation or other entity of
which securities or other ownership interests having ordinary voting power to
elect a majority of the board of directors or other persons performing similar
functions are at the time directly or indirectly owned by Unimar, it being
understood that the power to elect exactly 50% of the board of directors or
such other persons does not constitute a majority as used herein.

                 "Unrestricted Subsidiary" means any Subsidiary which is not a
Restricted Subsidiary.

                 "UT Pakistan" means Union Texas Pakistan, Inc., a Delaware
corporation.

                 "UTPC" means Union Texas Products Corporation, a Delaware
corporation.

                 "UTPL" means Union Texas Petroleum Limited, an English
company.

                 SECTION 1.02.  Accounting Terms and Determinations.  Unless
otherwise specified herein, all accounting terms used herein shall be
interpreted, all accounting determinations hereunder shall be made, and all
financial statements required to be delivered hereunder shall be prepared in
accordance with generally accepted accounting principles as in effect from time
to time, applied on a basis consistent with the most recent audited
consolidated financial statements of the Company and its Consolidated
Subsidiaries delivered to the Banks (except for changes concurred in by the
Company's independent public accountants); provided that in any determination
of Consolidated Debt if (i) the Company or any Restricted Subsidiary owes any
Debt to an Unrestricted Subsidiary which would otherwise be eliminated in such
determination of Consolidated Debt (the "intercompany Debt") (other than Debt
in an amount not exceeding $10,000,000 in the aggregate at any time and
representing advances by the Unrestricted Subsidiaries to the Company or a





                                       18
   23
Restricted Subsidiary made in the ordinary course of the cash management
practices of the Company and its Subsidiaries) and (ii) such Unrestricted
Subsidiary owes, at the date of determination, any Debt for borrowed money to a
Person other than the Company or a Subsidiary (the "third party Debt") (other
than any such Debt that also constitutes Debt of the Company or a Restricted
Subsidiary), then an amount equal to the lesser of (1) such intercompany Debt
and (2) such third party Debt, shall not be eliminated in such determination of
Consolidated Debt.

                 SECTION 1.03.  Types of Borrowings.  The term "Borrowing"
denotes the aggregate of Loans made by Banks to the Company pursuant to Article
II on a single date, of a single Type and, if such Loans are Euro-Dollar Loans,
for a single Interest Period.  Borrowings are classified for purposes of this
Agreement by reference to the pricing of Loans comprising such Borrowing (e.g.,
a "Euro-Dollar Borrowing" is a Borrowing comprised of Euro-Dollar Loans).

                 SECTION 1.04.  Miscellaneous.  The words "hereof", "herein"
and "hereunder" and words of similar import when used in this Agreement shall
refer to this Agreement as a whole and not to any particular provision of this
Agreement, and Article, Section, Schedule and Exhibit references are to
Articles and Sections of and Schedules and Exhibits to this Agreement, unless
otherwise specified.  The term "including" as used herein means "including
without limitation".  Definitions of terms defined herein shall be applicable
to both the singular and plural forms of the terms defined as appropriate.
References to "directly or indirectly" in respect of ownership of any interest
in any assets shall include, without limitation, direct ownership, indirect
ownership through capital stock or other ownership interest (whether through
one or more levels of subsidiaries, affiliates or other Persons) and any other
direct or indirect ownership arrangement.

                 SECTION 1.05.  Unimar.  To the extent this Agreement or any
other Financing Document obligates the Company or a Subsidiary to cause Unimar
and the Unimar Subsidiaries to take any action, such obligation shall be
satisfied if (a) the Company votes (or causes a Subsidiary to vote) the Unimar
Percentage in a manner consistent with the obligations of the Company and the
Subsidiaries under the Financing Documents and (b) any representative of the
Company sitting on any management board or board of directors of Unimar or any
of the Unimar Subsidiaries votes, as a member of such management board or board
of directors, in a manner consistent with the obligations of the Company and
the Subsidiaries under the Financing Documents.

                 SECTION 1.06.  Ratings.  A rating, whether public or private,
by S&P or Moody's shall be deemed to be in effect on the date of announcement
or publication by S&P or Moody's, as the case may be, of such rating or, in the
absence of such announcement or publication, on the effective date of such
rating and will remain in effect until the effective date of any change in such
rating.  In the event the standards for any rating by S&P or Moody's are
revised, or such rating is designated differently (such as by changing letter
designations to numerical designations), then the references herein to such
rating shall be changed to the revised or redesignated rating for which the
standards are closest to, but not lower than, the standards at the date hereof
for the rating which has been revised or redesignated, all as determined by the
Agent in good faith.  Long-term debt





                                       19
   24
supported by a letter of credit, guaranty (other than guaranties of
Subsidiaries) or other similar credit enhancement mechanism shall not be
considered as senior unsecured long-term debt.


                                   ARTICLE II

                                  THE CREDITS

                 SECTION 2.01.  Commitments to Lend.  During the Revolving
Credit Period each Bank severally agrees, on the terms and conditions set forth
in this Agreement, to make loans to the Company pursuant to this Section from
time to time in amounts such that the aggregate principal amount of Loans by
such Bank at any one time outstanding to the Company shall not exceed the
amount of such Bank's Commitment at such time.  Each Borrowing under this
Section shall be in an aggregate principal amount of $10,000,000 or any larger
multiple of $1,000,000 (except that any such Borrowing may be, subject to the
other terms hereof, in the aggregate amount of the remaining unused
Commitments) and shall be made from the several Banks ratably in proportion to
their respective Commitments.  Within the foregoing limits, the Company may
borrow under this Section, repay (whether pursuant to Section 2.10 or
otherwise), or to the extent permitted by Section 2.11, prepay Loans and
reborrow at any time during the Revolving Credit Period under this Section.

                 SECTION 2.02.  Notice of Borrowings.  (a) The Company shall
give the Agent notice (a "Notice of Borrowing") not later than 10:00 A.M.
(Houston time) on (x) the date of each Base Rate Borrowing, and (y) the third
Euro-Dollar Business Day before each Euro-Dollar Borrowing, specifying:

                 (i)      the date of such Borrowing, which shall be a Domestic
         Business Day in the case of a Base Rate Borrowing or a Euro-Dollar
         Business Day in the case of a Euro-Dollar Borrowing,

                 (ii)     the aggregate amount of such Borrowing,

                 (iii)    whether the Loans comprising such Borrowing are to be
         Base Rate Loans or Euro-Dollar Loans, and

                 (iv)     in the case of a Euro-Dollar Borrowing, the duration
         of the initial Interest Period applicable thereto, subject to the
         provisions of the definition of Interest Period.

Notwithstanding the foregoing, not more than ten Euro-Dollar Borrowings shall
be outstanding at any one time, and any Borrowing which would exceed such
limitation shall be made as a Base Rate Borrowing.





                                       20
   25
                          (b)     If requested to do so by the Company through
         the Agent at least ten Euro-Dollar Business Days before the first day
         of a proposed Interest Period for Euro-Dollar Loans, each Bank will
         advise the Agent before 10:00 A.M. (Houston time) on the sixth
         Euro-Dollar Business Day preceding the date of such proposed Interest
         Period as to whether, if the Company selects a specified duration of
         nine or twelve months for such Interest Period, such Bank expects that
         deposits in dollars with a corresponding term will be available to it
         in the relevant market on the first day of such Interest Period in the
         amount required to fund its Loan to which such Interest Period would
         apply.  Unless a Bank responds by such time to the effect that it
         expects such deposits will not be available to it, the Company shall
         be entitled to select such proposed duration for such Interest Period.

                 SECTION 2.03.  Conversions.  (a)  The Company may on any
Euro-Dollar Business Day, upon notice given to the Agent no later than 10:00
A.M. (Houston time) on the third Euro-Dollar Business Day prior to the date of
the proposed Conversion and subject to the provisions of Section 2.02 and
Article VIII and the other provisions hereof, Convert all Loans comprising one
or more Borrowings; provided that (i) Loans comprising a Borrowing may not be
Converted if after giving effect to such Conversion, such Borrowing would be a
Euro-Dollar Borrowing and the outstanding principal amount of such Borrowing
would be less than $10,000,000 and (ii) no Conversion (other than changing
Euro-Dollar Loans into Base Rate Loans) may be made if any Event of Default is
then existing.  Each such notice of a Conversion shall, within the restrictions
specified above, specify (i) the date of such Conversion, (ii) the Loans to be
Converted, (iii) if after giving effect to such Conversion, such Borrowing
would be a Euro-Dollar Borrowing, the commencement date and duration of the
proposed Interest Period for each Loan comprising such Borrowing, and (iv) the
nature of such Conversion (i.e., whether such Conversion is a change of Loans
of one Type into another Type, a continuation of Euro-Dollar Loans as such for
an additional Interest Period or an election to change an Interest Period).
Each such notice shall be irrevocable.

                 (b)      If the aggregate unpaid principal amount of
         Euro-Dollar Loans comprising any Borrowing shall be reduced by payment
         or prepayment or otherwise, to less than $10,000,000, such Loans shall
         automatically, on the last day of the then existing Interest Period
         therefor, Convert into Base Rate loans.

                 (c)      If the Company shall fail to select the duration of
         any Interest Period for any Euro-Dollar Loans in accordance with the
         provisions contained in the definition of "Interest Period" in Section
         1.01, or if there shall be any Event of Default, such Loans will
         automatically on the last day of the then existing Interest Period
         therefor, Convert into Base Rate Loans.

                 SECTION 2.04.  Notice to Banks; Funding of Loans.

                 (a)      Upon receipt of a Notice of Borrowing, the Agent
         shall promptly, (by no later than 10:30 A.M. (Houston time) by
         telephone or facsimile transmission) notify each Bank of





                                       21
   26
         the contents thereof and of such Bank's share of such Borrowing and
         such Notice of Borrowing shall not thereafter be revocable by the
         Company.

                          (b)     Not later than 12:00 Noon (Houston time) on
         the date of each Borrowing, each Bank shall (except as provided in
         subsection (c) of this Section) make available its share of such
         Borrowing, in Federal or other funds immediately available in Houston,
         to the Agent at its address specified in or pursuant to Section 9.01.
         Unless the Agent determines that any applicable condition specified in
         Article III has not been satisfied, the Agent will make the funds so
         received from the Banks available to the Company at the Agent's
         aforesaid address.

                 (c)      If any Bank makes a new Loan hereunder to the Company
         on a day on which the Company is to repay all or any part of an
         outstanding Loan from such Bank, such Bank shall apply the proceeds of
         its new Loan to make such repayment and only an amount equal to the
         difference (if any) between the amount being borrowed by the Company
         and the amount being repaid shall be made available by such Bank to
         the Agent as provided in subsection (b), or remitted by the Company to
         the Agent as provided in Section 2.12, as the case may be.

                 (d)      Unless the Agent shall have received notice from a
         Bank prior to the date of any Borrowing that such Bank will not make
         available to the Agent such Bank's share of such Borrowing, the Agent
         may assume that such Bank has made such share available to the Agent
         on the date of such Borrowing in accordance with subsections (b) and
         (c) of this Section 2.04 and the Agent may, in reliance upon such
         assumption, make available to the Company on such date a corresponding
         amount.  If and to the extent that such Bank shall not have so made
         such share available to the Agent, such Bank and the Company severally
         agree to repay to the Agent forthwith on demand such corresponding
         amount together with interest thereon, for each day from the date such
         amount is made available to the Company until the date such amount is
         repaid to the Agent, at (i) in the case of the Company, a rate per
         annum equal to the higher of the Federal Funds Rate and the interest
         rate applicable thereto pursuant to Section 2.07 and (ii) in the case
         of such Bank, the Federal Funds Rate.  If such Bank shall repay to the
         Agent such corresponding amount, such amount so repaid shall
         constitute such Bank's Loan included in such Borrowing for purposes of
         this Agreement.

                 SECTION 2.05.  Notes.

                 (a)  The Loans of each Bank to the Company shall be evidenced
         by a single Note of the Company payable to the order of such Bank for
         the account of its Applicable Lending Office in an amount equal to the
         aggregate unpaid principal amount of such Bank's Loans to the Company.

                 (b)      Each Bank may, by notice to the Company and the
         Agent, request that its Loans of a particular Type payable to such
         Bank (or such lending office, agency or branch of such Bank as such
         Bank may specify in such request) be evidenced by a separate Note of
         the Company in an amount equal to the aggregate unpaid principal
         amount of such Loans.  Each such Note shall





                                       22
   27
         be in substantially the form of Exhibit A hereto with appropriate
         modifications to reflect the fact that it evidences solely Loans of
         the relevant Type.  Any Bank that receives multiple Notes pursuant to
         this Section 2.05(b) agrees that:  (1) the aggregate principal amount
         payable by the Company under such Notes shall never exceed the
         aggregate principal amount of the Loans owed to such Bank (including,
         if applicable, the separate lending offices, agencies or branches of
         such Bank) and (2) the payees of the Notes issued at the request of
         such Bank shall enjoy no greater rights (voting or otherwise) than
         such Bank would enjoy in the absence of such request and such payees
         (including, if applicable, the separate lending offices, agencies or
         branches of such Bank) shall be considered a single Bank for purposes
         of this Agreement.  Each reference in this Agreement to the "Note" of
         such Bank shall be deemed to refer to and include any or all of such
         Notes, as the context may require.

                 (c)      Upon receipt of each Bank's Note pursuant to Section
         3.01(b), the Agent shall mail or send by private delivery service such
         Note to such Bank.  Each Bank shall record the date, amount and Type
         of each Loan made by it to the Company and the date and amount of each
         payment of principal made with respect thereto, and prior to any
         transfer of its Note shall endorse on the schedule forming a part
         thereof appropriate notations to evidence the foregoing information
         with respect to each such Loan then outstanding; provided that the
         failure of any Bank to make any such recordation or endorsement shall
         not affect the obligations of the Company under any of the Financing
         Documents.  Each Bank is hereby irrevocably authorized by the Company
         so to endorse any Note and to attach to and make a part of any Note a
         continuation of any such schedule as and when required.

                 SECTION 2.06.  Maturity of Loans.  Each Loan shall mature, and
the principal amount thereof shall be due and payable, on March 8, 2000
("Maturity Date").

                 SECTION 2.07.  Interest Rates.  The Company shall pay interest
on the unpaid principal amount of each Loan from the date of such Loan until
such principal amount shall be paid in full, at the following rates per annum:

                 (a)      If such Loan is a Base Rate Loan, for each day that
         such Loan is a Base Rate Loan, at a rate per annum equal to the sum of
         (i) the Base Rate for such day plus (ii) at such times as any Event of
         Default exists, 1%.  Such interest shall be payable quarterly on each
         March 31, June 30, September 30 and December 31 and on the date such
         Base Rate Loan is Converted or paid in full.  Any overdue interest on
         any Base Rate Loan shall bear interest, payable on demand, for each
         day until paid at a rate per annum equal to the sum of 1% plus the
         otherwise applicable rate for such day.

                 (b)      If such Loan is a Euro-Dollar Loan, at a rate per
         annum equal at all times during any Interest Period for such Loan to
         the sum of (i) the applicable London Interbank Offered Rate plus (ii)
         the Applicable Margin for such Interest Period plus (iii) at such
         times as any Event of Default exists, 1%; provided that any overdue
         principal of or interest on any Euro-Dollar Loan shall





                                       23
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         bear interest, payable on demand, for each day from and including the
         date payment thereof was due to but excluding the date of actual
         payment, at a rate per annum equal to the sum of 1% plus the higher of
         (x) the sum of the London Interbank Offered Rate applicable to such
         Loan plus the Applicable Margin applicable to an Interest Period of a
         Euro-Dollar Loan if such Euro-Dollar Loan were to commence on such day
         and (y) the sum of (1) the average (rounded upward, if necessary, to
         the next higher 1/16 of 1%) of the respective rates per annum at which
         one day (or, if such amount due remains unpaid more than three
         Euro-Dollar Business Days, then for such other period of time not
         longer than three months as the Agent may select) deposits in dollars
         in an amount approximately equal to such overdue payment due to each
         of the Reference Banks are offered to such Reference Bank in the
         London interbank market for the applicable period determined as
         provided above plus (2) the Applicable Margin applicable to an
         Interest Period of a Euro-Dollar Loan if such Euro-Dollar Loan were to
         commence on such day (or, if the circumstances described in clause (a)
         or (b) of Section 8.01 shall exist, at a rate per annum equal to the
         sum of 1% plus the rate applicable to Base Rate Loans for such day).
         Such interest shall be payable for each Interest Period on the last
         day thereof and, if such Interest Period is longer than three months,
         at intervals of three months after the first day thereof.

                 The "London Interbank Offered Rate" applicable to any Interest
Period means the arithmetic average (rounded upward, if necessary, to the next
higher 1/16 of 1%) of the respective rates per annum at which deposits in
dollars are offered to each of the Reference Banks in the London interbank
market at approximately 11:00 A.M. (London time) two Euro-Dollar Business Days
before the first day of such Interest Period in an amount approximately equal
to the principal amount of the Euro-Dollar Loan of such Reference Bank to which
such Interest Period is to apply and for a period of time comparable to such
Interest Period.

                 (c)      The Agent shall determine each interest rate
         applicable to the Loans hereunder.  The Agent shall give prompt notice
         to the Company and the participating Banks of each rate of interest so
         determined, and its determination thereof shall be conclusive in the
         absence of manifest error.  Upon request of the Company, the Agent
         shall furnish to it such information as to its determinations
         hereunder as the Company may reasonably request.

                 (d)      Each Reference Bank agrees to use its best efforts to
         furnish quotations to the Agent as contemplated by this Section.  If
         any Reference Bank does not furnish a timely quotation, the Agent
         shall determine the relevant interest rate on the basis of the
         quotation or quotations furnished by the remaining Reference Bank or
         Banks or, if none of such quotations is available on a timely basis,
         the provisions of Section 8.01 shall apply.

                 (e)      This Section 2.07 and each other provision in any of
         the Financing Documents or in any other agreement executed in
         connection herewith are specifically made subject to Section 2.16.





                                       24
   29
                 SECTION 2.08.  Facility Fees.

                 (a)      The Company shall pay to the Agent for the account of
         the Banks ratably a facility fee at the rate per annum for each
         calendar quarter determined as provided in Schedule I based on the
         Rating Level in effect on the first day of such quarter.  Such
         facility fee shall accrue (i) from and including the date of this
         Agreement to but excluding the earlier of the Termination Date or the
         date the Commitments are otherwise terminated, on the daily average
         aggregate amount of the Commitments (whether used or unused) and (ii)
         from and including the earlier of the Termination Date or the date the
         Commitments are otherwise terminated to but excluding the date the
         Loans shall be repaid in their entirety, on the daily average
         aggregate outstanding principal amount of the Loans.

                 (b)      Payments.  Accrued fees under this Section 2.08 shall
         be payable quarterly on each March 31, June 30, September 30 and
         December 31 and upon the date of termination of the Commitments in
         their entirety (and, if later, the date the Loans shall be repaid in
         their entirety).

                 SECTION 2.09.  Optional Termination or Reduction of
Commitments.  The Company may, upon at least three Domestic Business Days'
notice to the Agent, (i) terminate the Commitments at any time, if no Loans are
outstanding at such time, or (ii) ratably reduce from time to time by an
aggregate amount of $10,000,000 or any larger multiple of $5,000,000 the
aggregate amount of the Commitments in excess of the aggregate outstanding
principal amount of the Loans.

                 SECTION 2.10.  Mandatory Termination or Reduction of
Commitments.

                 (a)  The Commitments shall terminate on the Termination Date.

                 (b)      On the fifth Domestic Business Day following any
         Asset Sale that results in positive Excess Net Sales Proceeds, (i) the
         Company will deliver to each of the Banks a certificate of the chief
         financial officer, the chief accounting officer or the treasurer of
         the Company certifying the amount of such Excess Net Sales Proceeds
         from such Asset Sale, (ii) the Commitments shall be automatically
         reduced ratably by an amount equal to (a) 100% of the amount of such
         Excess Net Sales Proceeds minus (b) the amount, if any, by which the
         Other Credit Agreement Commitments are reduced pursuant to Section
         2.10(d)(ii) of the Other Credit Agreement as a result of such Excess
         Net Sales Proceeds from such Asset Sale, and (iii) the Company shall
         be obligated to repay such principal amount (together with accrued
         interest thereon) of each Bank's outstanding Loans, if any, as may be
         necessary so that after such repayment the aggregate outstanding
         principal amount of such Bank's Loans does not exceed the amount of
         such Bank's Commitment as then reduced.

                 SECTION 2.11.  Optional Prepayments.

                 (a) The Company may, upon at least one Domestic Business Day's
         notice to the Agent, prepay any Borrowing in whole at any time, or
         from time to time in part in amounts





                                       25
   30
         aggregating $10,000,000 or any larger multiple of $1,000,000, by
         paying the principal amount to be prepaid together with accrued
         interest thereon to the date of prepayment; provided that no partial
         prepayment of a Euro-Dollar Borrowing shall be made if after giving
         effect thereto the principal amount of such Borrowing would be less
         than $10,000,000.  Each such optional prepayment shall be applied to
         prepay ratably the Loans of the several Banks included in such
         Borrowing.

                 (b)      Upon receipt of a notice of prepayment pursuant to
         this Section, the Agent shall promptly notify each Bank of the
         contents thereof and of such Bank's ratable share (if any) of such
         prepayment and such notice shall not thereafter be revocable by the
         Company.

                 SECTION 2.12.  General Provisions as to Payments.

                 (a) The Company shall make each payment of principal of, and
         interest on, the Loans and of fees hereunder, not later than 12:00
         Noon (Houston time) on the date when due, in Federal or other funds
         immediately available in Houston, to the Agent at its address referred
         to in Section 9.01.  The Agent will promptly distribute to each Bank
         its ratable share of each such payment received by the Agent for the
         account of the Banks.  Whenever any payment of principal of, or
         interest on, the Base Rate Loans or of fees shall be due on a day
         which is not a Domestic Business Day, the date for payment thereof
         shall be extended to the next succeeding Domestic Business Day.
         Whenever any payment of principal of, or interest on, the Euro-Dollar
         Loans shall be due on a day which is not a Euro-Dollar Business Day,
         the date for payment thereof shall be extended to the next succeeding
         Euro-Dollar Business Day unless such Euro-Dollar Business Day falls in
         another calendar month, in which case the date for payment thereof
         shall be the next preceding Euro-Dollar Business Day.  If the date for
         any payment of principal is extended by operation of law or otherwise,
         interest thereon shall be payable for such extended time.

                 (b)      Unless the Agent shall have received notice from the
         Company prior to the date on which any payment is due from the Company
         to the Banks hereunder that the Company will not make such payment in
         full, the Agent may assume that the Company has made such payment in
         full to the Agent on such date and the Agent may, in reliance upon
         such assumption, cause to be distributed to each Bank on such due date
         an amount equal to the amount then due such Bank.  If and to the
         extent that the Company shall not have so made such payment, each Bank
         shall repay to the Agent forthwith on demand such amount distributed
         to such Bank together with interest thereon, for each day from the
         date such amount is distributed to such Bank until the date such Bank
         repays such amount to the Agent, at the Federal Funds Rate.

                 SECTION 2.13.  Funding Losses.  If the Company makes any
payment of principal with respect to any Euro-Dollar Loan (pursuant to Article
II, VI or VIII or otherwise) on any day other than the last day of an Interest
Period applicable thereto, or the end of an applicable period fixed pursuant to
the proviso to Section 2.07(b), or if the Company fails to borrow any
Euro-Dollar Loan after notice has been given to any Bank in accordance with
Section 2.04(a), or if any Conversion of any Euro-Dollar Loan occurs on any day
other than the last day of an Interest Period





                                       26

   31
applicable thereto, the Company shall reimburse each Bank within 15 days after
demand for any resulting loss or expense incurred by it (or by an existing or
prospective Participant in the related Loan), including (without limitation)
any loss incurred in obtaining, liquidating or employing deposits from third
parties, but excluding loss of margin from the period after any such payment or
failure to borrow; provided that such Bank shall have delivered to the Company
a certificate as to the amount of such loss or expense, which certificate shall
be conclusive in the absence of manifest error.

                 SECTION 2.14.  Computation of Interest and Fees.  Interest
based on the Base Rate hereunder shall be computed on the basis of a year of
365 days (or 366 days in a leap year) and paid for the actual number of days
elapsed (including the first day but excluding the last day).  All other
interest and fees shall be computed on the basis of a year of 360 days and paid
for the actual number of days elapsed (including the first day but excluding
the last day).

                 SECTION 2.15.  Chapter 15.  In no event shall the provisions
of Chapter 346 of the Texas Finance Code, as amended (formerly found in Article
5069, Chapter 15 of the Revised Civil Statutes of Texas) (which regulates
certain revolving credit loan accounts and revolving tri-party accounts) apply
to any Loan made hereunder.

                 SECTION 2.16.  Maximum Interest Rate.

                 (a)      Nothing contained in this Agreement or the Notes
         shall require the Company to pay interest at a rate exceeding the
         maximum rate permitted without penalty by applicable law.  Each
         provision in the Financing Documents and any other agreement executed
         in connection herewith is expressly limited so that in no event
         whatsoever shall the amount paid thereunder, or otherwise paid, by the
         Company for the use, forbearance or detention of the money to be
         loaned under this Agreement, exceed that amount of money which would
         cause the effective rate of interest thereon to exceed the maximum
         rate of interest permitted without penalty under applicable law, and
         all amounts payable under the Financing Documents or any other
         agreement executed in connection herewith, or otherwise payable in
         connection therewith, shall be subject to reduction so that such
         amounts paid or payable for the use, forbearance or detention of money
         to be loaned under this Agreement shall not exceed that amount of
         money which would cause the effective rate of interest thereon to
         exceed the maximum rate of interest permitted without penalty under
         applicable law.

                 (b)      If the amount of interest payable for the account of
         any Bank on any interest payment date in respect of the immediately
         preceding interest computation period, computed pursuant to Section
         2.07, would exceed the maximum amount permitted without penalty by
         applicable law to be charged by such Bank, the amount of interest
         payable for its account on such interest payment date shall be
         automatically reduced to such maximum permissible amount.





                                       27
   32
                 (c)      If the amount of interest payable for the account of
         any Bank in respect of any interest computation period is reduced
         pursuant to clause (b) of this Section and the amount of interest
         payable for its account in respect of any subsequent interest
         computation period, computed pursuant to Section 2.07, would be less
         than the maximum amount permitted without penalty by applicable law to
         be charged by such Bank, then the amount of interest payable for its
         account in respect of such subsequent interest computation period
         shall be automatically increased to such maximum permissible amount;
         provided that at no time shall the aggregate amount by which interest
         paid for the account of any Bank has been increased pursuant to this
         clause (c) exceed the aggregate amount by which interest paid for its
         account has theretofore been reduced pursuant to clause (b) of this
         Section.

                 (d)      In the event that maturity of the Loans is
         accelerated for any reason, or in the event of any required or
         permitted prepayment of the Loans, then such consideration that
         constitutes interest payable for the account of any Bank shall never
         include more than the maximum amount allowed without penalty by
         applicable law to be charged by such Bank and excess interest, if any,
         payable for the account of such Bank pursuant to its Note, this
         Agreement or otherwise shall be cancelled automatically as of the date
         of such acceleration or prepayment and, if theretofore paid, shall be
         credited on the Loans of such Bank (or, to the extent in excess of
         such Loans, refunded by such Bank to the Company).

                 (e)      It is further agreed that, without limitation of the
         foregoing, all calculations of the rate of interest contracted for,
         charged or received for the account of any Bank under the Note held by
         it, under this Agreement, under any other agreement executed in
         connection herewith or otherwise in connection with the Loans or the
         Commitment of such Bank for the purpose of determining whether such
         rate exceeds the maximum nonusurious interest rate applicable to such
         Bank, shall be made, to the extent permitted by usury laws applicable
         to such Bank (now or hereafter enacted), by amortizing, prorating and
         spreading in equal parts during the period of the full stated terms of
         the Loans evidenced by such Note all interest at any time contracted
         for, charged or received by such Bank in connection therewith.

                 (f)      To the extent that any Bank may be subject to Texas
         law limiting the amount of interest payable for its account, such Bank
         shall utilize the weekly ceiling as provided for in Chapter 303 of the
         Texas Finance Code and in Article 5069-1D.002 of the Revised Civil
         Statutes, in each case as amended (formerly known as the indicated
         (weekly) rate ceiling in Article 5069-1.04 of the Revised Civil
         Statutes of Texas).

                 SECTION 2.17.  Taxes.

                 (a)  Any and all payments by the Company hereunder or under
         the Notes shall be made, in accordance with Section 2.12, free and
         clear of and without deduction for any and all present or future
         taxes, levies, imposts, deductions, charges and withholdings, and all
         liabilities with respect thereto, excluding(i) in the case of the
         Agent, each Co-Agent and each Bank, United States





                                       28
   33
         federal income taxes and, without duplication, any taxes imposed on
         its income, and franchise taxes imposed on it, by the jurisdiction
         under the laws of which the Agent, such Co-Agent or such Bank, as the
         case may be, is organized or any political subdivision thereof and
         (ii) in the case of each Bank, taxes imposed on its income, and
         franchise taxes imposed on it, by the jurisdiction of such Bank's
         Applicable Lending Office or any political subdivision thereof (all
         such non-excluded taxes, levies, imposts, deductions, charges,
         withholdings and liabilities being hereinafter referred to as
         "Taxes").  If the Company shall be required by law to deduct any Taxes
         from or in respect of any sum payable hereunder or under any Note to
         any Bank, any Co-Agent or the Agent, (i) the sum payable shall be
         increased as may be necessary so that after making all required
         deductions (including deductions applicable to additional sums payable
         under this Section 2.17) such Bank, such Co-Agent or the Agent (as the
         case may be) receives an amount equal to the sum it would have
         received had no such deductions been made, (ii) the Company shall make
         such deductions and (iii) the Company shall pay the full amount
         deducted to the relevant taxation authority or other authority in
         accordance with applicable law.

                 (b)      In addition, the Company agrees to pay any present or
         future stamp or documentary taxes or any other excise or property
         taxes, assessments, charges or similar levies which arise from any
         payment made hereunder or under the Notes or from the execution,
         delivery or registration of, or otherwise with respect to, this
         Agreement or any of the Notes (hereinafter referred to as "Other
         Taxes").

                 (c)      The Company will indemnify each Bank, each Co-Agent
         and the Agent for the full amount of Taxes and Other Taxes (including,
         without limitation, any Taxes or Other Taxes imposed by any
         jurisdiction on amounts payable under this Section 2.17) paid by such
         Bank, such Co-Agent or the Agent (as the case may be) and any
         liability (including penalties, interest and expenses) arising
         therefrom or with respect thereto, whether or not such Taxes or Other
         Taxes were correctly or legally asserted.  Payments under any
         indemnification provided for in this Section 2.17(c) shall be made
         within 30 days from the date such Bank, such Co-Agent or the Agent (as
         the case may be) makes written demand therefor.


                 (d)      Within 30 days after the date of any payment of
         Taxes, the Company will furnish to the Agent, at its address referred
         to in Section 9.01, the original or a certified copy of a receipt
         evidencing payment thereof.  Should any Bank, any Co-Agent or the
         Agent ever receive any refund, credit or deduction from any taxing
         authority to which such Bank, such Co-Agent or the Agent, as the case
         may be, would not be entitled but for the payment by the Company of
         Taxes as required by this Section 2.17 (it being understood that the
         decision as to whether or not to claim, and if claimed, as to the
         amount of any such refund, credit or deduction shall be made by such
         Bank, such Co-Agent or the Agent, as the case may be, in its sole
         discretion), such Bank, such Co-Agent or the Agent, as the case may
         be, thereupon shall repay to the Company an amount with respect to
         such refund, credit or deduction equal to any net reduction in taxes
         actually obtained by such Bank, such Co-Agent or the Agent, as the
         case may be, and reasonably determined by such Bank, such Co-Agent or
         the Agent, as the case may be, to be attributable to such refund,
         credit or deduction.





                                       29
   34
                 (e)      Each Bank represents that it is either (i) a
         corporation, association or other entity organized under the laws of
         the United States or any state thereof or (ii) entitled to complete
         exemption from United States withholding tax imposed on or with
         respect to any payments, including fees, to be made to it pursuant to
         this Agreement or the Notes.  Each Bank that is not organized under
         the laws of the United States or any state thereof (a "Foreign Bank")
         agrees to provide to the Company and the Agent, on or prior to the
         date of this Agreement in the case of each Foreign Bank signatory
         hereto, and on the date of the Assignment pursuant to which it became
         a Bank in the case of each other Foreign Bank, two duly completed
         copies of United States Internal Revenue Service Form 1001 or 4224,
         certifying in either case that such Foreign Bank is entitled to
         receive payments from the Company under this Agreement and the Notes
         without deduction or withholding of any United States federal income
         taxes.  Each Foreign Bank which so delivers a Form 1001 or 4224
         further undertakes to deliver to each of the Company and the Agent two
         additional copies of such form (or a successor form) on or before the
         date that such form expires or becomes obsolete or after the
         occurrence of any event requiring a change in the most recent form so
         delivered by it, and such amendments thereto or extensions or renewals
         thereof as may be reasonably requested by the Company or the Agent, in
         each case certifying that such Foreign Bank is entitled to receive
         payments from the Company under this Agreement and the Notes without
         deduction or withholding of any United States federal income taxes,
         unless an event (including without limitation any change in treaty,
         law or regulation) has occurred prior to the date on which any such
         delivery would otherwise be required which renders all such forms
         inapplicable or which would prevent such Foreign Bank from duly
         completing and delivering any such form with respect to it and such
         Foreign Bank advises the Company and the Agent that it is not capable
         of receiving such payments without any deduction or withholding of
         United States federal income tax.  Each Bank agrees to indemnify and
         hold the Company and the Agent harmless from any United States taxes,
         penalties, interest and other expenses, costs and losses incurred or
         payable by them as a result of either (a) such Bank's failure to
         submit any form that it is required to provide pursuant to this
         Section 2.17(e) or (b) the Agent's and the Company's reliance on any
         such form which such Bank has provided to them, or on the
         representation of such Bank made to them pursuant to this Section
         2.17(e).

                 (f)      If any Taxes are paid by the Company pursuant to this
         Section 2.17 in respect of the Applicable Lending Office of any Bank,
         such Bank will, if requested to do so by the Company, designate a
         different Applicable Lending Office if such designation will avoid the
         need to pay, or reduce the amount of, such Taxes and will not, in the
         judgment of such Bank, be otherwise disadvantageous to such Bank.





                                       30
   35
                                  ARTICLE III

                                   CONDITIONS

                 SECTION 3.01.  Initial Borrowing.  The obligation of any Bank
to make a Loan on the occasion of the initial Borrowing is subject to the
satisfaction (or waiver in accordance with Section 9.05) of each of the
following conditions:

                 (a)      receipt by the Agent of counterparts hereof signed by
         each of the parties hereto (or, in the case of any party as to which
         an executed counterpart shall not have been received, receipt by the
         Agent in form satisfactory to it of telegraphic, telex or other
         written confirmation from such party of execution of a counterpart
         hereof by such party);

                 (b)      receipt by the Agent for the account of each Bank of
         a duly executed Note of the Company dated on the date of this
         Agreement complying with the provisions of Section 2.05;

                 (c)      receipt by the Agent of an opinion of Alan R. Crain,
         Jr., Vice President and General Counsel of the Company, substantially
         in the form of Exhibit C hereto;

                 (d)      receipt by the Agent of an opinion of Andrews & Kurth
         L.L.P., special counsel for the Company, substantially in the form of
         Exhibit D hereto;

                 (e)      receipt by the Agent of an opinion of Bracewell &
         Patterson, L.L.P., special counsel for the Agent, substantially in the
         form of Exhibit E hereto;

                 (f)      receipt by the Agent of all documents it may
         reasonably request relating to the existence of the Company, the
         corporate authority for and the validity of each of the Financing
         Documents, and any other matters relevant thereto, all in form and
         substance satisfactory to the Agent;

                 (g)      receipt by the Agent of a certificate of an officer
         of the Company stating the rating by S&P and Moody's of all senior
         unsecured long-term debt of the Company as in effect on the date of
         this Agreement; and

                 (h)      receipt by the Agent of a certificate of the chief
         financial officer, the chief accounting officer or the treasurer of
         the Company certifying, as of the Effective Date, that no Default
         exists.





                                       31
   36
                          SECTION 3.02.  All Borrowings.  The obligation of any
Bank to make a Loan on the occasion of any Borrowing is subject to the 
satisfaction of the following conditions (in addition to the conditions set 
forth in Section 3.01):

                 (a)      receipt by the Agent of a Notice of Borrowing as
         required by Section 2.02;

                 (b)      the fact that immediately prior to and immediately
         after such Borrowing, no Default shall have occurred and be
         continuing; and

                 (c)      the fact that the representations and warranties of
         the Company contained in this Agreement (except, in the case of any
         Borrowing subsequent to the first Borrowing, the representations and
         warranties set forth in Section 4.04(a) or (c)) shall be true and
         correct in all material respects on and as of the date of such
         Borrowing.

Each Borrowing hereunder shall be deemed to be a representation and warranty by
the Company on the date of such Borrowing as to the facts specified in this
Section.


                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

                 The Company represents and warrants that:

                 SECTION 4.01.  Corporate Existence and Power.  The Company is
a corporation duly incorporated, validly existing and in good standing under
the laws of its jurisdiction of incorporation, and has all corporate powers and
all material governmental licenses, authorizations, consents and approvals
required to own its assets and to carry on its business as now conducted and is
duly qualified as a foreign corporation in good standing in each jurisdiction
where the nature of its business or the ownership or leasing of its properties
requires such qualification and where the failure so to qualify could have a
material adverse effect on the business, financial position, results of
operations or prospects of the Company and its Subsidiaries, taken as a whole.
Neither the Company nor any Subsidiary or Affiliate is subject to regulation
under the Public Utility Holding Company Act of 1935, the Investment Company
Act of 1940, the Interstate Commerce Act or any other law or regulation which
limits the incurrence by the Company or any Subsidiary of Debt, including, but
not limited to, laws relating to common or contract carriers or the sale of
electricity, gas, steam, water or other public utility services.

                 SECTION 4.02.  Corporate and Governmental Authorization;
Contravention.  The execution, delivery and performance by the Company of each
Financing Document to which it is





                                       32
   37
shown as being a party are within the Company's corporate powers, have been
duly authorized by all necessary corporate action, and do not contravene, or
constitute a default under, any provision of applicable law or regulation
(including, without limitation, Regulations G, T, U and X of the Board of
Governors of the Federal Reserve System) or the certificate of incorporation,
by-laws or other charter documents of the Company or of any instrument or
agreement evidencing or governing Debt or any other material agreement,
judgment, injunction, order, decree or other instrument binding upon the
Company or result in the creation or imposition of any material Lien on any
asset of the Company or any Subsidiary.  All authorizations, consents and
approvals of governmental bodies, agencies or officials required in connection
with the execution, delivery and performance by the Company of the Financing
Documents to which it is shown as being a party have been obtained and are in
full force and effect.

                 SECTION 4.03.  Binding Effect.  This Agreement and each of the
Notes have been duly executed and delivered by the Company and constitute
legal, valid and binding agreements of the Company.

                 SECTION 4.04.  Information.

                 (a)      The consolidated balance sheet of the Company and its
         Consolidated Subsidiaries as of December 31, 1997 and the related
         consolidated statements of operations, cash flows and common stock and
         other shareholders' equity for the fiscal year then ended, reported on
         by Price Waterhouse LLP and set forth in the Company's 1997 Form 10-K,
         a copy of which has been delivered to each of the Banks, fairly
         present, in conformity with generally accepted accounting principles,
         the consolidated financial position of the Company and its
         Consolidated Subsidiaries as of such date and their consolidated
         results of operations and cash flows for such fiscal year.

                 (b)      To the best knowledge of the Company, there are no
         statements or conclusions in any Engineering Report delivered pursuant
         hereto which are based upon or include misleading information or fail
         to take into account material information regarding the matters
         reported therein, it being understood that such statements and
         conclusions are necessarily based upon professional opinions,
         estimates and forecasts, and the Company does not warrant that such
         opinions, estimates and forecasts will ultimately prove to have been
         accurate.

                 (c)      The Company's 1997 Form 10-K does not contain any
         untrue statement of material fact or omit to state a material fact
         necessary in order to make the statements contained therein not
         misleading as of the date thereof.  Except for matters of general
         public knowledge with respect to the oil and gas industry, the Company
         has disclosed to the Banks in writing any and all facts which
         materially and adversely affect or may be reasonably expected so to
         affect (to the extent the Company can now reasonably foresee) the
         business, assets, operations, prospects or condition, financial or
         otherwise, of the Company and its Subsidiaries or the ability of the
         Company to perform its obligations under the Financing Documents.





                                       33
   38
                 (d)      Since December 31, 1997 there has been no material
         adverse change in the business, financial position, results of
         operations or prospects of the Company and its Subsidiaries, taken as
         a whole.

                 (e)      No Default exists.

                 SECTION 4.05.  Litigation.  There is no action, suit or
proceeding pending against, or to the knowledge of the Company threatened
against or affecting, the Company or any of its Subsidiaries or any of their
respective properties or interests at law or in admiralty or equity, before any
court or arbitrator or any governmental body, agency or official, foreign or
domestic, in which there is a reasonable possibility of an adverse decision
which could materially adversely affect the business, financial position or
results of operations of the Company and its Subsidiaries, taken as a whole, or
which in any manner draws into question the validity of any Financing Document.

                 SECTION 4.06.  Compliance with ERISA.  Each member of the
ERISA Group has fulfilled its obligations under the minimum funding standards
of ERISA and the Internal Revenue Code with respect to each Plan and is in
compliance in all material respects with the presently applicable provisions of
ERISA and the Internal Revenue Code with respect to each Plan.  No member of
the ERISA Group has (i) sought a waiver of the minimum funding standard under
Section 412 of the Internal Revenue Code in respect of any Plan, (ii) failed to
make any contribution or payment to any Plan or Multiemployer Plan or in
respect of any Benefit Arrangement, or made any amendment to any Plan or
Benefit Arrangement, which has resulted or could result in the imposition of a
Lien or the posting of a bond or other security under ERISA or the Internal
Revenue Code or (iii) incurred any liability under Title IV of ERISA other than
a liability to the PBGC for premiums under Section 4007 of ERISA.

                 SECTION 4.07.  Environmental Matters.  In the ordinary course
of its business, the Company conducts an ongoing review of the effect of
existing Environmental Laws on the business, operations and properties of the
Company and the Subsidiaries, in the course of which it attempts to identify
and evaluate associated liabilities and costs (including, without limitation,
any capital or operating expenditures required for clean-up or closure of
properties presently or previously owned, any capital or operating expenditures
required to achieve or maintain compliance with environmental protection
standards imposed by law or as a condition of any license, permit or contract,
any related constraints on operating activities, including any periodic or
permanent shutdown of any facility or reduction in the level of or change in
the nature of operations conducted thereat and any actual or potential
liabilities to third parties, including employees, and any related costs and
expenses).  On the basis of this review, the Company has reasonably concluded
that existing Environmental Laws are unlikely to have a material adverse effect
on the business, financial condition, results of operations or prospects of the
Company and its Subsidiaries, taken as a whole.

                 SECTION 4.08.  Subsidiaries.  All Restricted Assets are owned
as of the date of this Agreement by the Company and the Persons listed in Part
B of Schedule II hereto or, in the case of





                                       34
   39
Restricted Assets sold since December 31, 1993, by Persons other than
Unrestricted Subsidiaries.  Part A of Schedule II hereto contains a true,
complete and accurate list of all Unrestricted Subsidiaries, and Part B of
Schedule II hereto contains a true, complete and accurate list of all
Restricted Subsidiaries as of the date of this Agreement.

                 SECTION 4.09.  Ownership of Restricted Subsidiaries. The
Company or a Restricted Subsidiary is the record and beneficial owner, free and
clear of all Liens (other than those permitted by Section 5.07), of (i) all of
the issued and outstanding capital stock (other than directors' qualifying
shares and shares beneficially owned by the Company or a Restricted Subsidiary
and held by nominees of the Company or a Restricted Subsidiary solely to
satisfy requirements of local law) and other ownership interests of each
Restricted Subsidiary (except Unimar and the Unimar Restricted Subsidiaries and
any other Restricted Subsidiary the capital stock of which is sold pursuant to
a sale permitted by Section 5.14) and (ii) except during any period during
which Unimar is an Unrestricted Subsidiary or ceases to be a Subsidiary, at
least 50% of the ownership interest in Unimar and the Unimar Restricted
Subsidiaries.  Except as disclosed on Schedule VI, there are no outstanding
options, warrants or other rights to acquire any capital stock or other
ownership interest of any Restricted Subsidiary.

                 SECTION 4.10.  Title to Properties.  The Company and each of
the Subsidiaries have good title, free and clear of all Liens, claims, burdens
and title defects, to all of the material assets reflected in the Company's or
such Subsidiary's books and records as being owned by them except Liens
permitted by this Agreement and claims, burdens and title defects not
materially adverse in the aggregate.

                 SECTION 4.11.  Taxes and Other Obligations.  Consolidated
United States Federal income tax returns of the Company and the Subsidiaries
have been examined by the Internal Revenue Service, or the statutory period for
such examination has expired, for all years up to and including the year ended
December 31, 1993, and all assessed deficiencies resulting from such
examination have been discharged or reserved against as required by generally
accepted accounting principles.  The Company and the Subsidiaries have filed
all United States Federal, state and local income tax returns and all other
material domestic tax returns which are required to be filed by them and have
paid, or provided for the payment before the same became delinquent of, all
taxes due pursuant to such returns or pursuant to any assessment received by
the Company or any Subsidiary, other than those taxes being diligently
contested in good faith by appropriate proceedings.  The charges, accruals and
reserves on the books of the Company and the Subsidiaries in respect of taxes
are, in the opinion of the Company, adequate.  The Company and the Subsidiaries
have set up such reserves as are required by generally accepted accounting
principles for the payment of additional taxes for years which have not been
audited by the respective tax authorities.  The Company and the Subsidiaries
have paid all other material obligations when due other than those being
contested in good faith by appropriate proceedings.





                                       35
   40
                 SECTION 4.12.  Regulation U.  Neither the Company  nor any
Subsidiary is engaged in the business of extending credit for the purpose of
purchasing or carrying margin stock (within the meaning of Regulation G) or
margin stock (within the meaning of Regulation U).  Following the application
of the proceeds of each Loan, not more than 25% of the value of the assets of
the Company, or of the Company and its Subsidiaries, which are subject to any
arrangement with the Agent or any Bank (herein or otherwise) whereby the
Company's or any Subsidiary's right or ability to sell, pledge or otherwise
dispose of assets is in any way restricted will be any such margin stock.

                 SECTION 4.13.  Certain Obligations.  Neither the Company nor
any Subsidiary has any obligation to make payments on the Joint Venture Debt
other than those permitted by Section 5.17.  There is no Non-Recourse Debt
existing on the date of this Agreement.

                 SECTION 4.14.  United Kingdom Assets.  Substantially all of
the Restricted Assets located in the United Kingdom (including the United
Kingdom Sector of the North Sea) are directly owned by UTPL as of the date of
this Agreement.


                                   ARTICLE V

                                   COVENANTS

                 The Company agrees that, so long as any Bank has any
Commitment hereunder or any amount payable under any Note remains unpaid:

                 SECTION 5.01.  Information.  The Company will deliver to each
of the Banks:

                 (a)      as soon as available and in any event within 100 days
         after the end of each fiscal year of the Company, a consolidated
         balance sheet of the Company and its Consolidated Subsidiaries as of
         the end of such fiscal year and the related consolidated statements of
         operations, cash flows and common stock and other shareholders' equity
         for such fiscal year, setting forth in each case in comparative form
         the figures for the previous fiscal year, all reported on in a manner
         acceptable to the Securities and Exchange Commission by Price
         Waterhouse LLP or other independent public accountants of nationally
         recognized standing;

                 (b)      as soon as available and in any event within 60 days
         after the end of each of the first three quarters of each fiscal year
         of the Company, a consolidated balance sheet of the Company and its
         Consolidated Subsidiaries as of the end of such quarter and the
         related consolidated statements of operations and cash flows for such
         quarter and for the portion of the Company's fiscal year ended at the
         end of such quarter, setting forth in each case in comparative form
         the figures for the corresponding quarter and the corresponding





                                       36
   41
         portion of the Company's previous fiscal year, all certified (subject
         to normal year-end adjustments) as to preparation in accordance with
         generally accepted accounting principles and consistency by the chief
         financial officer, the chief accounting officer or the treasurer of
         the Company;

                 (c)      simultaneously with the delivery of each set of
         financial statements referred to in clauses (a) and (b) above, a
         certificate of the chief financial officer, the chief accounting
         officer or the treasurer of the Company (i) setting forth in
         reasonable detail the calculations required to establish whether the
         Company was in compliance with the requirements of Sections 5.05 and
         5.15 on the date of such financial statements and (ii) stating whether
         any Default exists on the date of such certificate and, if any Default
         then exists, setting forth the details thereof and the action which
         the Company and its Subsidiaries are taking or propose to take with
         respect thereto;

                 (d)      as soon as available and in any event within 60 days
         after the end of each fiscal quarter of the Company, a certificate of
         the chief financial officer, the chief accounting officer or the
         treasurer of the Company certifying (i) the rating (or lack of a
         rating thereof) by each of S&P and Moody's of the senior unsecured
         long-term debt of the Company on the date of such certificate, (ii)
         the Unimar Percentage as of the end of such quarter and the amounts as
         of the end of such quarter of Consolidated Debt, Defeased Debt,
         Excluded Subordinated Debt, Debt of the Company and its Consolidated
         Subsidiaries determined on a consolidated basis, Debt of the Company
         and the Restricted Subsidiaries determined on a consolidated basis,
         Debt of Unimar, Debt of Unrestricted Subsidiaries, Excess Letter of
         Credit/Guarantee Amount, Non-Restricted Asset Non-Recourse Debt,
         Non-Recourse Debt of the Company and the Restricted Subsidiaries, and
         Restricted Subsidiaries Recourse Debt, and (iii) each Asset Sale that
         has been consummated during such quarter, the Fair Market Value of the
         Restricted Assets subject thereto, the amount of fees, commissions,
         expenses and taxes related thereto, the Net Sales Proceeds therefrom
         and the cumulative amount of the Excess Net Sales Proceeds from all
         Assets Sales since December 31, 1993;

                 (e)      within five days after the chief financial officer,
         the chief accounting officer or treasurer of the Company obtains
         knowledge of any Default, if such Default is then continuing, a
         certificate of the chief financial officer, the chief accounting
         officer or the treasurer of the Company setting forth the details
         thereof and the action which the Company and its Subsidiaries are
         taking or propose to take with respect thereto;

                 (f)      immediately upon the filing of, or any material
         development in, any litigation or the occurrence of any other event or
         contingency, if such development, litigation, event or contingency
         could reasonably be expected to have a material adverse effect on the
         business, assets, operations, prospects or condition, financial or
         otherwise, of the Company and its Subsidiaries, taken as a whole, a
         certificate of the chief financial





                                       37
   42
         officer, the chief accounting officer or the treasurer of the Company
         setting forth the details of such development, litigation, event or
         contingency and the action which the Company and its Subsidiaries are
         taking or propose to take with respect thereto;

                 (g)      as soon as available and in any event within 100 days
         after the end of each fiscal year of each Restricted Subsidiary (other
         than the Unimar Restricted Subsidiaries), a consolidated balance sheet
         of such Restricted Subsidiary and its consolidated subsidiaries as of
         the end of such fiscal year and the related consolidated statements of
         operations, cash flows and common stock and other shareholders' equity
         for such fiscal year, setting forth in each case in comparative form
         the figures for the previous fiscal year, all certified as to
         preparation in accordance with generally accepted accounting
         principles and consistency by the chief financial officer, the chief
         accounting officer or the treasurer of such Restricted Subsidiary;

                 (h)      as soon as available and in any event within 60 days
         after the end of the first three quarters of each fiscal year of each
         Restricted Subsidiary (other than the Unimar Restricted Subsidiaries,
         Union Texas Petroleum Energy Corporation and Union Texas International
         Corporation), a consolidated balance sheet of such Restricted
         Subsidiary and its consolidated subsidiaries as of the end of such
         quarter and the related consolidated statements of operations and cash
         flows for such quarter and for the portion of such Restricted
         Subsidiary's fiscal year ended at the end of such quarter, setting
         forth in each case in comparative form the figures for the
         corresponding quarter and the corresponding portion of such Restricted
         Subsidiary's previous fiscal year, all certified (subject to normal
         year-end adjustments) as to preparation in accordance with generally
         accepted accounting principles and consistency by the chief financial
         officer, the chief accounting officer or the treasurer of such
         Restricted Subsidiary;

                 (i)      promptly upon the mailing thereof to the shareholders
         of the Company generally, copies of all financial statements, reports
         and proxy statements so mailed;

                 (j)      promptly upon the filing thereof, copies of all
         registration statements (other than the exhibits thereto and any
         registration statements on Form S-8 or its equivalent) and reports on
         Forms 10-K, 10-Q and 8-K (or their equivalents) which the Company
         shall have filed with the Securities and Exchange Commission;

                 (k)      at least 45 days prior to the closing of each Asset
         Sale that will result in aggregate Net Sales Proceeds (for such sale
         or, if such sale is one of a series of related sales, for all sales
         and contemplated sales in such series) of $50,000,000 or more, notice
         of such sale describing the assets to be sold and the estimated Net
         Sales Proceeds thereof;

                 (l)      if and when any member of the ERISA Group (i) gives
         or is required to give notice to the PBGC of any "reportable event"
         (as defined in Section 4043 of ERISA) (other





                                       38
   43
         than a "reportable event" not subject to the provisions for 30-day
         notice to the PBGC under the regulations issued under Section 4043 of
         ERISA) with respect to any Plan which might constitute grounds for a
         termination of such Plan under Title IV of ERISA, or knows that the
         plan administrator of any Plan has given or is required to give notice
         of any such reportable event, a copy of the notice of such reportable
         event given or required to be given to the PBGC; (ii) receives notice
         of complete or partial withdrawal liability under Title IV of ERISA or
         notice that any Multiemployer Plan is in reorganization, is insolvent
         or has been terminated, a copy of such notice; (iii) receives notice
         from the PBGC under Title IV of ERISA of an intent to terminate,
         impose liability (other than for premiums under Section 4007 of ERISA)
         in respect of, or appoint a trustee to administer, any Plan, a copy of
         such notice; (iv) applies for a waiver of the minimum funding standard
         under Section 412 of the Internal Revenue Code, a copy of such
         application; (v) gives notice of intent to terminate any Plan under
         Section 4041(c) of ERISA, a copy of such notice and other information
         filed with the PBGC; (vi) gives notice of withdrawal from any Plan
         pursuant to Section 4063 of ERISA, a copy of such notice; or (vii)
         fails to make any payment or contribution to any Plan or Multiemployer
         Plan or in respect of any Benefit Arrangement which has resulted or
         could result in the imposition of a Lien or the posting of a bond or
         other security, a certificate of the chief financial officer, the
         chief accounting officer or the treasurer of the Company setting forth
         details as to such occurrence and action, if any, which the Company or
         applicable member of the ERISA Group is required or proposes to take;

                 (m)      within 5 days after the chief financial officer, the
         treasurer or the controller of the Company has knowledge of any filing
         under Rule 13d of the Securities and Exchange Commission, promulgated
         under the Securities Exchange Act of 1934, as amended, a copy thereof;

                 (n)      within 5 days after receipt by the Company of any
         written agreement of the type referred to in Section 6.01(k)(iii)(c),
         (A) a copy thereof except that (i) if such written agreement has not
         been filed with the Securities and Exchange Commission and is not
         otherwise public information, each Bank as a condition to receiving a
         copy of such written agreement may be required to sign, prior to
         receipt thereof, a confidentiality agreement pursuant to which it
         agrees that it will treat such written agreement in a confidential
         manner until such written agreement otherwise becomes public, except
         for disclosure (a) to counsel for and other advisors, accountants and
         auditors of such Bank, (b) as may be required by statute, decision,
         order, rule, regulation or other law, (c) to regulatory authorities,
         (d) in connection with any litigation involving such written
         agreement, such confidentiality agreement or any of the Financing
         Documents, and (e) in connection with any assignment, prospective
         assignment, sale, prospective sale, participation or prospective
         participation or other transfer or prospective transfer of any of such
         Bank's interests hereunder; provided that any such assignee,
         prospective assignee, purchaser, prospective purchaser, participant,
         prospective participant, transferee, or prospective transferee shall
         have entered into a confidentiality agreement for the benefit of the
         Company substantially upon the terms of





                                       39
   44
         this Section 5.01(n), and (ii) if the Company is contractually
         prohibited from delivering a copy of such written agreement to the
         Banks, the Company shall not be required to deliver such written
         agreement unless such prohibition has been waived, but the Company
         shall use reasonable efforts to obtain such waiver or if it is a party
         to such written agreement to prevent any such prohibition from being
         included therein, and (B) if the Company is a party to such written
         agreement, but is excused pursuant to clause (A)(ii) of this Section
         5.01(n) from delivering a copy thereof to the Banks, the Company shall
         notify the Banks of the existence of such written agreement (but not
         the content thereof or other parties thereto), but as a condition to
         receiving such notice the Banks may be required to sign, prior to
         receipt of such notice, a confidentiality agreement conforming to
         clause (A)(i) of this Section 5.01(n);

                 (o)      by May 1 of each year, an Engineering Report as of
         the last day of the immediately preceding year;

                 (p)      promptly upon the closing of the sale or other
         disposition of any capital stock of UTPC or any option, warrant or
         other right to acquire any such capital stock, notice thereof;

                 (q)      promptly after any change in or termination of the
         rating of any senior unsecured long-term debt of the Company by S&P or
         Moody's, notice thereof.

                 (r)      from time to time such additional information
         regarding the financial position or business of the Company or any
         Subsidiary as the Agent, at the request of any Bank, may reasonably
         request.

                 SECTION 5.02.  Affirmative Covenants.  The Company will
maintain its existence and cause each Restricted Subsidiary to maintain its
existence except in the case of (i) a merger of a Restricted Subsidiary into
the Company in a merger permitted by Section 5.08 hereof, (ii) the merger of a
Restricted Subsidiary into another Restricted Subsidiary, if immediately after
such merger (and giving effect thereto), no Default shall have occurred and be
continuing, and (iii) any Asset Sale in the form of the merger of a Restricted
Subsidiary into another Person, if immediately after such merger (and giving
effect thereto), no Event of Default shall have occurred and be continuing.
The Company and each Subsidiary shall:

                 (a)      Conduct of Business; Property.  Cause all material
         property useful and necessary in its business to be maintained in good
         working order and condition and to be operated prudently in accordance
         with good industry practice; and to the extent consistent with prudent
         business practices, defend its right, title and interest in its
         material properties against all adverse claims.





                                       40
   45
                 (b)      Compliance with Laws.  Comply with all applicable
         laws, ordinances, rules, regulations and reporting, filing and other
         requirements of governmental authorities (including, without
         limitation, Environmental Laws and ERISA and the rules and regulations
         thereunder), except where the necessity of compliance therewith is
         contested in good faith by appropriate proceedings or where the
         failure to so comply would not have a material adverse effect on the
         Company and its Subsidiaries, taken as a whole.

                 (c)      Inspection of Property, Books and Records.  Keep
         proper books of record and account in accordance with sound accounting
         practices; and permit representatives of any Bank, at such Bank's sole
         risk and expense, to visit and inspect any of its properties (subject
         to obtaining any required consent of third- party operators), to
         examine and make abstracts and copies from any of its books and
         records and to discuss its affairs, finances and accounts with its
         officers and employees, and use its best efforts to make its
         independent public accountants available to discuss the affairs,
         finances and accounts of the Company and any of its Subsidiaries, all
         at such reasonable times and as often as may reasonably be desired.

                 SECTION 5.03.  Primary Business.  The exploration for, and
production and marketing of, Hydrocarbons will continue to be the primary
business of the Company and its Subsidiaries taken as whole.

                 SECTION 5.04.  Insurance.  The Company will maintain, and will
cause each Subsidiary to maintain (either in the name of the Company or in such
Subsidiary's own name) with financially sound and reputable insurance
companies, insurance on their property in at least such amounts and against at
least such risks as are usually insured against in the same general area by
companies of established repute engaged in the same or similar business; and
will furnish to the Banks, upon written request from the Agent, full
information as to the insurance carried.

                 SECTION 5.05.  Debt.

                 (a)      At no time will Restricted Subsidiaries Recourse Debt
         exceed $75,000,000.

                 (b)      Consolidated Debt will not, on the last day of any
         calendar quarter, exceed 3.75 times Operating Cash Flow for the four
         calendar quarters ending on such day.

                 (c)      Neither the Company nor any Restricted Subsidiary
         will create, assume or otherwise incur any Debt if at the time of
         creation, assumption or incurrence of such Debt or after giving effect
         to the creation, assumption or incurrence of such Debt, any Event of
         Default would exist; provided that the Company or any Restricted
         Subsidiary may renew or extend (but not increase) its own Debt.

                 SECTION 5.06.  Restricted Payments.  Neither the Company nor
any Subsidiary shall declare or make any Restricted Payment unless, immediately
prior thereto and immediately





                                       41
   46
thereafter, no Event of Default shall have occurred and be continuing.  Neither
the Company nor any Subsidiary shall make any Restricted Transfer unless,
immediately prior thereto and immediately thereafter, no Event of Default shall
have occurred and be continuing; provided that the Company or any Subsidiary
can make Restricted Transfers in the form of Investments in an Affiliate,
Unrestricted Subsidiary or subsidiary of an Unrestricted Subsidiary if (i) such
Affiliate, Unrestricted Subsidiary or subsidiary, as the case may be, has no
outstanding Debt at the time of such Investment and does not thereafter create,
assume or otherwise incur any Debt while any Event of Default is continuing and
(ii) the Company notifies the Banks of any such Investment in excess of
$5,000,000 at least ten days prior to such Investment.  Nothing in this Section
shall prohibit the payment of any dividend or distribution within 45 days after
the declaration thereof if payment of such dividend or distribution was not
prohibited by this Agreement at the time such declaration was made.

                 SECTION 5.07.  Negative Pledge.  Neither the Company nor any
Restricted Subsidiary will create, assume or suffer to exist (i) any Lien on
any capital stock or other ownership interest of any Restricted Subsidiary now
owned or hereafter acquired by it or any Lien on any option, warrant or other
right to acquire any capital stock or other ownership interest of any
Restricted Subsidiary now owned or hereafter acquired by it, other than those
described in Part A of Schedule III or (ii) any Lien on any other asset now
owned or hereafter acquired by it, except for the following Liens on assets not
referred to in the foregoing clause (i) of this Section:

                 (a)      Liens existing on the date of this Agreement,
         securing Debt outstanding and other obligations (including contractual
         obligations) existing on the date of this Agreement and, except in the
         case of inchoate operator's Liens, described in Part B of Schedule III
         hereto;

                 (b)      any Lien (i) on any Non-Restricted Asset securing
         only Non-Restricted Asset Non-Recourse Debt of the Company or any
         Restricted Subsidiary or (ii) on any asset of Virginia Indonesia
         Company, Virginia International Company or Union Texas East Kalimantan
         Limited securing Joint Venture Debt;

                 (c)      mechanics', materialmen's, carriers' and other
         statutory Liens, but only if arising, and only so long as continuing,
         in the ordinary course of business; or deposits or pledges to obtain
         the release of any such Lien; or easements, encroachments or other
         title defects which do not materially detract from the value of its
         assets or materially impair the use thereof in the operation of its
         business;

                 (d)      Liens arising in the ordinary course of its business
         which (i) do not secure Debt, (ii) do not secure any obligation in an
         amount exceeding $15,000,000 and (iii) do not in the aggregate
         materially detract from the value of its assets or materially impair
         the use thereof in the operation of its business;





                                       42
   47
                 (e)      Liens on any interest in a Partnership arising under
         any agreement creating or governing such Partnership (including
         Unimar) and securing only obligations of the members of such
         Partnership to make Investments in such Partnership;

                 (f)      Liens arising under any customary provision of any
         joint operating agreement or similar agreement relating to the
         exploration, production, development or transportation of oil and gas;

                 (g)      Liens not otherwise permitted by the foregoing
         clauses of this Section on assets (other than any of the Restricted
         Assets) securing Debt in an aggregate principal amount at any time
         outstanding not to exceed $20,000,000;

                 (h)      any Lien securing the refinancing, extension, renewal
         or refunding of any Debt secured by any Lien permitted by the
         foregoing subsection (a) of this Section; provided that such Debt is
         not increased from the lesser of the amount of such Debt set forth on
         Schedule III hereto or the amount of such Debt outstanding immediately
         prior to such refinancing, extension, renewal or refunding, and such
         Lien does not cover any property that is not described on Schedule III
         hereto as securing such Debt; and

                 (i)      Liens in favor of third parties on cash, treasury
         securities and other property deposited in margin accounts relating
         to, or otherwise delivered as collateral for any obligation of the
         Company or any Subsidiary under, contracts of the Company or any
         Subsidiary evidencing any Derivative Transaction or other hedge
         obligation; provided, that the aggregate Fair Market Value of all such
         cash, treasury securities and other property subject to such Liens
         shall not exceed from time to time $15,000,000.

                 SECTION 5.08.  Consolidations and Mergers.  The Company will
not consolidate or merge with or into any Person; provided that the Company may
merge with another Person if the Company is the surviving corporation and,
immediately after such merger (and giving effect thereto), no Default shall
have occurred and be continuing.

                 SECTION 5.09.  Use of Proceeds.  The proceeds of the Loans
made under this Agreement will be used by the Company for general corporate
purposes; provided that none of such proceeds will be used in any manner or for
any purpose that results in any violation of any applicable law or regulation
(including, without limitation, Regulations G, T, U and X of the Board of
Governors of the Federal Reserve System).

                 SECTION 5.10.  Addition of Guarantors.  If any Subsidiary of
the Company Guarantees (i) Debt (other than Funded Debt) of the Company having
an aggregate outstanding balance less than $25,000,000, and any Guarantee of
such Debt has not been released or terminated within 60 days of the date of the
incurrence of such obligation or (ii) Debt (other than Debt described in clause
(i) above) of the Company, then the Company shall (a) cause all Loans and all
other





                                       43
   48
amounts payable at any time under any of the Financing Documents, including,
without limitation, interest which accrues during a proceeding which occurs
under the U.S. Bankruptcy Code or which would otherwise accrue under the terms
of any of the Financing Documents, but for a proceeding under the U.S.
Bankruptcy Code, to be equally and ratably guaranteed by such Subsidiary, (b)
cause such Subsidiary to execute and deliver a subsidiary guaranty agreement in
form and substance satisfactory to the Banks, and (c) deliver an opinion of
counsel and officers' certificate to the effect that such subsidiary guaranty
agreement has been duly authorized and executed by such Subsidiary and
constitutes the legal, valid, binding and enforceable obligation of such
Subsidiary, all in form and substance satisfactory to the Banks.  "Funded Debt"
of any Person means at any date, all Debt (including, without limitation, Debt
incurred under any revolving credit, letter of credit or working capital
facility) of such Person that matures by its terms, or that is renewable at the
option of such Person to a date more than one year after the date on which such
Debt is originally incurred.

                 SECTION 5.11.  Restrictions on Dividends, Intercompany Loans,
or Investments.  The Company will not create or otherwise cause or permit to
exist or become effective, or permit any Subsidiary to create or otherwise
cause or permit to exist or become effective, any consensual encumbrance or
restriction (other than the Financing Documents) on the ability of any
Restricted Subsidiary to (i) pay dividends or make any other distributions on
its capital stock or other ownership interests or pay any Debt or other
obligation owed to the Company or any Restricted Subsidiary, or (ii) make any
loans or advances to or other Investments in the Company or any Restricted
Subsidiary, except any encumbrance or restriction in effect on the date of this
Agreement and described on Schedule IV hereto.

                 SECTION 5.12.  Loans and Advances.  The Company will not make
or permit to remain outstanding any cash loan or advance to any Person, or
permit any Restricted Subsidiary to make or permit to remain outstanding any
cash loan or advance to any Person, except (i) loans and advances to
Subsidiaries or joint ventures, partnerships or other business ventures in
which the Company or any Subsidiary has or is contemporaneously acquiring an
interest or participation; and (ii) other loans and advances not exceeding
$10,000,000 at any time outstanding.

                 SECTION 5.13.  Cross-Default.  The Company will not create,
assume, otherwise incur or suffer to exist, or permit any Restricted Subsidiary
to create, assume, otherwise incur or suffer to exist, any Debt if the maturity
of such Debt is or may be accelerated (assuming the giving of notice or lapse
of time or both), in whole or in part, as a result of any default under, or
acceleration of (i) any Non-Recourse Debt of the Company or any Restricted
Subsidiary or (ii) any Debt of any Unrestricted Subsidiary, unless the Required
Banks shall have given their prior written consent to such Debt of the Company
or Restricted Subsidiary to be so created, assumed or otherwise incurred, which
consent will not be unreasonably withheld; provided that this Section 5.13
shall not prohibit a provision in a Guarantee of the Company or a Restricted
Subsidiary Guaranteeing Debt of an Unrestricted Subsidiary that provides that
the payment obligation under such Guarantee may be accelerated upon default
under or acceleration of such Debt.





                                       44
   49
                 SECTION 5.14.  Subsidiaries.  The Company will at all times
own, either directly or through one or more Restricted Subsidiaries, free and
clear of all Liens (other than those permitted by Section 5.07), 100% of all
issued and outstanding capital stock (other than directors' qualifying shares
and shares beneficially owned by the Company or a Restricted Subsidiary and
held by nominees of the Company or a Restricted Subsidiary solely to satisfy
requirements of local law) and other ownership interests of each Restricted
Subsidiary and all options, warrants and other rights to acquire any such
capital stock or any such ownership interest, except for (i) Unimar and the
Unimar Restricted Subsidiaries, (ii) any Restricted Subsidiary sold or
otherwise disposed of pursuant to an Asset Sale, if after giving effect to such
Asset Sale, the Company does not own, directly or indirectly, any interest in
such Restricted Subsidiary, and (iii) those options described on Schedule VI.
The Company will at all times own, either directly or through one or more
Restricted Subsidiaries, free and clear of all Liens (other than those
permitted by Section 5.07), 50% or more of the ownership interest in Unimar and
the Unimar Restricted Subsidiaries and all options, warrants and other rights
to acquire any such ownership interest (other than those described on Schedule
VI); provided that the Company and the Restricted Subsidiaries may sell all of
their ownership interest in Unimar and the Unimar Restricted Subsidiaries and
such options, warrants and other rights if, after giving effect to such sale,
the Company does not own, directly or indirectly, any interest in Unimar, the
Unimar Restricted Subsidiaries or any such option, warrant or other right.  The
Company will not at any time permit any Restricted Subsidiary that is not a
Unimar Restricted Subsidiary to become a Unimar Restricted Subsidiary.  The
Company will not permit any Restricted Asset to be sold, leased, transferred or
otherwise disposed of to any Person that was an Unrestricted Subsidiary
immediately prior thereto if any Default then exists or would result.  The
Company will not permit any Restricted Subsidiary to issue any preferred stock
unless such preferred stock at all times is owned only by the Company.  The
Company will not permit any Restricted Subsidiary to own, directly, both (a)
any UK Asset and (b) any Non-UK Asset.

                 SECTION 5.15.  Adjusted Equity and Interest Coverage.  The
Company will at all times maintain Adjusted Equity of $350,000,000 or more.
The Company will cause EBITDA for each period of four consecutive calendar
quarters to exceed 4.00 times Cash Interest Expense for such period.

                 SECTION 5.16.  Excluded Subordinated Debt and Preferred Stock.
Neither the Company nor any Subsidiary will pay, prepay, purchase, redeem,
defease, acquire, exchange or convert any preferred stock (other than
Restricted Preferred Stock) or any Excluded Subordinated Debt, except (a)
exchanges for or conversions to common stock of the Company, (b) payments of
interest when due required by the terms of any such Excluded Subordinated Debt
as such terms are in effect on the date such Excluded Subordinated Debt is
incurred and (c) if no Event of Default exists, payments of ordinary periodic
dividends (excluding liquidating dividends) on such preferred stock in
accordance with the terms thereof as such terms are in effect on the date such
preferred stock is issued.





                                       45
   50
                 SECTION 5.17.  Certain Obligations.  Neither the Company nor
any Subsidiary will create, incur, assume or suffer to exist any obligation on
its part to make any payment on the Joint Venture Debt other than (a) the
obligations set forth in the agreements listed on Schedule V hereto with
respect to Joint Venture Debt in existence on the date of this Agreement and
(b) obligations substantially similar to those referred to in clause (a) with
respect to Joint Venture Debt created, incurred, assumed or arising after the
date of this Agreement.

                 SECTION 5.18.  Restrictions on Asset Sales.  (a)  The Company
will not and will not permit any of its Restricted Subsidiaries to enter into
any Asset Sale if after giving effect thereto any Event of Default would exist.

                 (b)      The Company will not permit to occur any Asset Sale
         involving, directly or indirectly, any UK Assets if the aggregate Net
         Sales Proceeds of all Asset Sales involving, directly or indirectly,
         UK Assets since December 31, 1993 would exceed $250,000,000.

                 SECTION 5.19.  Conversion to Unrestricted Subsidiary.  The
Company may convert a Restricted Subsidiary into an Unrestricted Subsidiary by
giving the Agent notice of such conversion at least 5 Domestic Business Days
prior to such conversion; provided that (i) no Restricted Subsidiary shall be
so converted so long as it owns directly or indirectly any interest in any
Restricted Asset and (ii) no such conversion shall be made if at the time of
such notice or after giving effect to such conversion, any Default would exist.


                                   ARTICLE VI

                                    DEFAULTS

                 SECTION 6.01.  Events of Default.  If one or more of the
following events ("Events of Default") shall have occurred and be continuing:

                 (a)      the Company shall fail to pay when due any principal
         of any Loan, or shall fail to pay within five days of the due date
         thereof any interest on any Loan, any fees or any other amount payable
         hereunder;

                 (b)      the Company or any Subsidiary shall fail to observe
         or perform any covenant contained in Sections 5.05 to 5.18, inclusive;

                 (c)      the Company or any Subsidiary shall fail to observe
         or perform any covenant or agreement contained in this Agreement
         (other than those covered by clause (a) or (b) above) for 30 days
         after written notice thereof has been given to the Company by the
         Agent at the request of any Bank;





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                 (d)      any representation, warranty, certification or
         statement made by the Company or any Subsidiary in this Agreement or
         made in any certificate, financial statement or other document
         delivered pursuant to this Agreement shall prove to have been
         incorrect in any material respect when made (or deemed made);

                 (e)      the Company or any Restricted Subsidiary shall fail
         to make any payment in respect of any Material Debt (other than the
         Notes) when due or within any applicable grace period;

                 (f)      any event or condition shall occur which results in
         the acceleration of the maturity of any Material Debt of the Company
         or any Restricted Subsidiary (other than the Notes) or enables (or,
         with the giving of notice or lapse of time or both, would enable) the
         holder of such Material Debt or any Person acting on such holder's
         behalf to accelerate the maturity thereof;

                 (g)      the Company or any Restricted Subsidiary shall
         commence a voluntary case or other proceeding seeking liquidation,
         reorganization or other relief with respect to itself or its debts
         under any bankruptcy, insolvency or other similar law now or hereafter
         in effect or seeking the appointment of a trustee, receiver,
         liquidator, custodian or other similar official of it or any
         substantial part of its property, or shall consent to any such relief
         or to the appointment of or taking possession by any such official in
         an involuntary case or other proceeding commenced against it, or shall
         make a general assignment for the benefit of creditors, or shall fail
         generally to pay its debts as they become due, or shall take any
         corporate action to authorize any of the foregoing;

                 (h)      an involuntary case or other proceeding shall be
         commenced against the Company or any Restricted Subsidiary seeking
         liquidation, reorganization or other relief with respect to it or its
         debts under any bankruptcy, insolvency or other similar law now or
         hereafter in effect or seeking the appointment of a trustee, receiver,
         liquidator, custodian or other similar official of it or any
         substantial part of its property, and such involuntary case or other
         proceeding shall remain undismissed and unstayed for a period of 60
         days; or an order for relief shall be entered against the Company or
         any Restricted Subsidiary under the federal bankruptcy laws as now or
         hereafter in effect;

                 (i)      any member of the ERISA Group shall fail to pay when
         due an amount or amounts aggregating in excess of $5,000,000 which it
         shall have become liable to pay under Title IV of ERISA; or notice of
         intent to terminate a Material Plan shall be filed under Title IV of
         ERISA by any member of the ERISA Group, any plan administrator or any
         combination of the foregoing; or the PBGC shall institute proceedings
         under Title IV of ERISA to terminate, to impose liability (other than
         for premiums under Section 4007 of ERISA) in respect of, or to cause a
         trustee to be appointed to administer any Material Plan; or a
         condition shall exist by reason of which the PBGC would be entitled to
         obtain a decree





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         adjudicating that any Material Plan must be terminated; or there shall
         occur a complete or partial withdrawal from, or a default, within the
         meaning of Section 4219(c)(5) of ERISA, with respect to, one or more
         Multiemployer Plans which could cause one or more members of the ERISA
         Group to incur a current payment obligation in excess of $5,000,000;

                 (j)      a judgment or order for the payment of money in
         excess of $15,000,000 (net of applicable insurance coverage which is
         acknowledged by the insurer) shall be rendered against the Company or
         any Restricted Subsidiary and such judgment or order shall continue
         unsatisfied and unstayed for a period of 30 days;

                 (k)      any Person or two or more Persons acting in concert,
         together with any affiliates thereof, (i) shall have acquired
         beneficial ownership, directly or indirectly, (a) within any 12 month
         period, of (1) more than 25% of the Company's common stock or (2)
         securities representing more than 25% of the combined voting power of
         all securities of the Company entitled to vote in the election of
         directors (other than securities having such power only by reason of
         the happening of a contingency) ("Voting Securities"), or (b) within
         any 24 month period, of (1) more than 40% of the Company's common
         stock or (2) more than 40% of the Company's Voting Securities, (ii)
         owns a higher percentage of the Company's common stock or Voting
         Securities than the percentage owned by Kohlberg Kravis Roberts & Co.
         and/or non-operating investment entities it controls, and (iii) either
         (a) owns 50% or more of the Company's common stock or Voting
         Securities, (b) directly or indirectly elects or causes the election
         of Persons constituting in the aggregate a majority of the Board of
         Directors of the Company or any Restricted Subsidiary, or (c)
         exercises, directly or indirectly, by written agreement, control over
         the Company or any Restricted Subsidiary; provided that no Default or
         Event of Default shall occur under this subsection (k) until the
         Agent, following request by the Required Banks, gives notice to the
         Company that such an Event of Default is declared, and such notice may
         not be given after the date which is 45 days after the Banks actually
         receive notice from the Company to the effect that the matters set
         forth in clauses (i), (ii) and (iii) have occurred (for purposes of
         this provision, "beneficial ownership" shall mean beneficial ownership
         within the meaning of Rule 13d-3 of the Securities and Exchange
         Commission promulgated under the Securities Exchange Act of 1934, as
         amended, and the number and percentage of securities beneficially
         owned by any Person or Persons shall be calculated in accordance with
         such Rule); or

                 (l)      any "Event of Default", as defined in the Other
Credit Agreement, shall occur;

then, and in every such event, the Agent shall (i) if requested by Banks having
at least 51% in the aggregate amount of the Commitments, by notice to the
Company terminate the Commitments and, upon the giving of such notice by the
Agent, they shall thereupon terminate, and (ii) if requested by Banks holding
Notes evidencing at least 51% in aggregate principal amount of the Loans, by
notice to the Company declare the Notes (together with accrued interest
thereon) to be, and, upon the





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giving of such notice by the Agent, the Notes shall thereupon become,
immediately due and payable without notice of intent to accelerate, notice of
acceleration, presentment, demand, protest or other notice of any kind, all of
which are hereby waived by the Company; provided that in the case of any of the
Events of Default specified in clause (g) or (h) above, without any notice to
the Company or any other act by the Agent or the Banks, the Commitments shall
thereupon terminate and the Notes (together with accrued interest thereon)
shall become immediately due and payable without notice of intent to
accelerate, notice of acceleration, presentment, demand, protest or other
notice of any kind, all of which are hereby waived by the Company.

                 SECTION 6.02.  Notice of Default.  The Agent shall give notice
to the Company under Section 6.01(c) promptly upon being requested to do so by
any Bank and shall thereupon notify all the Banks thereof.


                                  ARTICLE VII

                                   THE AGENT

                 SECTION 7.01.  Appointment and Authorization.  Each Bank
irrevocably appoints and authorizes the Agent to take such action as agent on
its behalf and to exercise such powers under the Financing Documents as are
delegated to the Agent by the terms hereof or thereof, together with all such
powers as are reasonably incidental thereto.

                 SECTION 7.02.  Agent and Affiliates.  NationsBank shall have
the same rights and powers under the Financing Documents as any other Bank and
may exercise or refrain from exercising the same as though it were not the
Agent, and NationsBank and its affiliates may accept deposits from, lend money
to, and generally engage in any kind of business with the Company or any
Subsidiary or other affiliate of the Company as if it were not the Agent
hereunder.

                 SECTION 7.03.  Action by Agent.  The obligations of the Agent
under the Financing Documents are only those expressly set forth herein.
Without limiting the generality of the foregoing, the Agent shall not be
required to take any action with respect to any Default, except as expressly
provided in Article VI.

                 SECTION 7.04.  Consultation with Experts.  The Agent may
consult with legal counsel (who may be counsel for the Company or any
Subsidiary), independent public accountants, independent petroleum engineers
and other experts selected by it and the Agent shall not be liable for any
action taken or omitted to be taken by it in good faith in accordance with the
advice of such counsel, accountants, engineers or experts.

                 SECTION 7.05.  Liability of Agent.  Neither the Agent nor any
of its directors, officers, agents or employees shall be liable for any action
taken or not taken by it in connection





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herewith (i) with the consent or at the request of the Required Banks or (ii)
in the absence of its own gross negligence or willful misconduct.  Neither the
Agent nor any of its directors, officers, agents or employees shall be
responsible for or have any duty to ascertain, inquire into or verify (i) any
statement, warranty or representation made in connection with this Agreement or
any borrowing hereunder; (ii) the performance or observance of any of the
covenants or agreements of the Company or any Subsidiary; (iii) the
satisfaction of any condition specified in Article III, except receipt of items
required to be delivered to the Agent; (iv) the validity, effectiveness or
genuineness of the Financing Documents or any other instrument or writing
furnished in connection herewith; or (v) the accuracy of any Engineering
Report.  The Agent shall not incur any liability by acting in reliance upon any
notice, consent, certificate, statement, or other writing (which may be a bank
wire, telex or similar writing) believed by it to be genuine or to be signed by
the proper party or parties.

                 SECTION 7.06.  Indemnification.  Each Bank shall, ratably in
accordance with its Commitment, indemnify the Agent (to the extent not
reimbursed by the Company) against any cost, expense (including counsel fees
and disbursements), claim, demand, action, loss or liability (except such as
result from the Agent's gross negligence or willful misconduct) that the Agent
may suffer or incur in connection with the Financing Documents or any action
taken or omitted by the Agent hereunder (IT BEING EXPRESSLY UNDERSTOOD AND
AGREED THAT, EXCEPT FOR SUCH NEGLIGENCE AS IS SO DETERMINED TO CONSTITUTE GROSS
NEGLIGENCE, SUCH INDEMNIFICATION DOES EXTEND TO THE CONSEQUENCES OF THE
ORDINARY NEGLIGENCE, WHETHER SOLE OR CONTRIBUTORY, OF THE AGENT).

                 SECTION 7.07.  Credit Decision.  Each Bank acknowledges that
it has, independently and without reliance upon the Agent or any other Bank,
and based on such documents and information as it has deemed appropriate, made
its own credit analysis and decision to enter into this Agreement.  Each Bank
also acknowledges that it will, independently and without reliance upon the
Agent or any other Bank, and based on such documents and information as it
shall deem appropriate at the time, continue to make its own credit decisions
in taking or not taking any action under this Agreement.

                 SECTION 7.08.  Successor Agent.  The Agent may resign at any
time by giving written notice thereof to the Banks and the Company and may be
removed at any time with or without cause by the Required Banks.  Upon any such
resignation or removal, the Company shall have the right, with the consent of
the Required Banks, to appoint a successor Agent.  If no successor Agent shall
have been so appointed with the consent of the Required Banks, and shall have
accepted such appointment, within 30 days after the retiring Agent's giving of
notice of resignation or the Required Banks' removal of the retiring Agent,
then the retiring Agent may, on behalf of the Banks, appoint a successor Agent,
which shall be a commercial bank organized or licensed under the laws of the
United States of America or of any State thereof and having a combined capital
and surplus of at least $50,000,000.  Upon the acceptance of its appointment as
Agent hereunder by a successor Agent, such successor Agent shall thereupon
succeed to and become vested with all the rights and duties of the retiring
Agent, and the retiring Agent shall be discharged from its duties and
obligations





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   55
under the Financing Documents.  After any retiring Agent's resignation or
removal hereunder as Agent, the provisions of this Article VII shall inure to
its benefit as to any actions taken or omitted to be taken by it while it was
Agent.

                 SECTION 7.09.  Agent's Fees.  The Company shall pay to the
Agent for its own account fees in the amounts and at the times previously
agreed upon between the Company and the Agent.


                                  ARTICLE VIII

                            CHANGE IN CIRCUMSTANCES

                 SECTION 8.01.  Basis for Determining Interest Rate Inadequate
or Unfair.  If on or prior to the first day of any Interest Period:

                 (a)      the Agent is advised by the Reference Banks that
         deposits in dollars (in the applicable amounts) are not being offered
         to the Reference Banks in the relevant market for such Interest
         Period, or

                 (b)      Banks having 50% or more of the aggregate amount of
         the Commitments advise the Agent that the London Interbank Offered
         Rate as determined by the Agent will not adequately and fairly reflect
         the cost to such Banks of funding their Euro-Dollar Loans for such
         Interest Period,

the Agent shall forthwith give notice thereof to the Company and the Banks,
whereupon until the Agent notifies the Company that the circumstances giving
rise to such suspension no longer exist, (i) the obligations of the Banks to
make Euro-Dollar Loans, or make any Conversion (other than changing Euro-Dollar
Loans into Base Rate Loans), shall be suspended, and (ii) unless the Company
notifies the Agent at least two Domestic Business Days before the date of any
Euro-Dollar Borrowing for which a Notice of Borrowing has previously been given
that it elects not to borrow on such date, such Borrowing shall instead be made
as a Base Rate Borrowing.

                 SECTION 8.02.  Illegality.  If, after the date of this
Agreement, the adoption of any applicable law, rule or regulation, or any
change therein, or any change in the interpretation or administration thereof
by any governmental authority, central bank or comparable agency charged with
the interpretation or administration thereof, or compliance by any Bank (or its
Euro-Dollar Lending Office) with any request or directive (whether or not
having the force of law) of any such authority, central bank or comparable
agency shall make it unlawful or impossible for any Bank (or its Euro-Dollar
Lending Office) to make, maintain or fund its Euro-Dollar Loans, or make any
Conversion (other than changing Euro-Dollar Loans into Base Rate Loans), and
such Bank shall so notify the Agent, the Agent shall forthwith give notice
thereof to the other Banks and the Company,





                                       51
   56
whereupon until such Bank notifies the Company and the Agent that the
circumstances giving rise to such suspension no longer exist, the obligation of
such Bank to make Euro-Dollar Loans, or make any Conversion (other than
changing Euro-Dollar Loans into Base Rate Loans), as the case may be, shall be
suspended.  Before giving any notice to the Agent pursuant to this Section,
such Bank shall designate a different Euro-Dollar Lending Office if such
designation will avoid the need for giving such notice and will not, in the
judgment of such Bank, be otherwise disadvantageous to such Bank.  If such Bank
shall determine that it may not lawfully continue to maintain and fund any of
its outstanding Euro-Dollar Loans to maturity and shall so specify in such
notice, each such Euro-Dollar Loan shall be immediately and automatically
Converted into a Base Rate Loan (on which interest and principal shall be
payable contemporaneously with the related Euro-Dollar Loans of the other
Banks).

                 SECTION 8.03.  Increased Cost and Reduced Return.  (a) If
after the date hereof, the adoption of any applicable law, rule or regulation,
or any change therein, or any change in the interpretation or administration
thereof by any governmental authority, central bank or comparable agency
charged with the interpretation or administration thereof, or compliance by any
Bank (or its Applicable Lending Office) with any request or directive (whether
or not having the force of law) of any such authority, central bank or
comparable agency:

                 (i)      shall subject any Bank (or its Applicable Lending
         Office) to any tax, duty or other charge with respect to its
         Euro-Dollar Loans, its Note or its obligation to make Euro-Dollar
         Loans, or shall change the basis of taxation of payments to any Bank
         (or its Applicable Lending Office) of the principal of or interest on
         its Euro-Dollar Loans or any other amounts due under this Agreement in
         respect of its Euro-Dollar Loans or its obligation to make Euro-Dollar
         Loans (except for changes in the rate of tax on the overall net income
         of such Bank or its Applicable Lending Office imposed by the
         jurisdiction in which such Bank's principal executive office or
         Applicable Lending Office is located); or

                 (ii)     shall impose, modify or deem applicable any reserve,
         special deposit or similar requirement (including, without limitation,
         any such requirement imposed by the Board of Governors of the Federal
         Reserve System against assets of, deposits with or for the account of,
         or credit extended by, any Bank (or its Applicable Lending Office) or
         on the United States market for certificates of deposit or the London
         interbank market any other condition affecting its Euro-Dollar Loans,
         its Note or its obligation to make Euro-Dollar Loans;

and the result of any of the foregoing is to increase the cost to such Bank (or
its Applicable Lending Office) of making or maintaining any Euro-Dollar Loan or
making any Conversion (other than changing Euro-Dollar Loans into Base Rate
Loans), or to reduce the amount of any sum received or receivable by such Bank
(or its Applicable Lending Office) under this Agreement or under its Note with
respect thereto, by an amount deemed by such Bank to be material, then, within
15 days





                                       52
   57
after demand by such Bank (with a copy to the Agent), the Company shall pay to
such Bank such additional amount or amounts as will compensate such Bank for
such increased cost or reduction; provided that the Company shall not be
obligated to compensate any Bank for any such reduction attributable to a
period (i) more than 90 days prior to the giving of notice by such Bank to the
Company of its intention to seek compensation under this subsection (a) or (ii)
more than six months prior to the making of demand by such Bank for payment
thereof in accordance herewith.

                 (b)      If any Bank shall have determined that the adoption
         of any applicable law, rule or regulation regarding capital adequacy,
         or any change therein, or any change in the interpretation or
         administration thereof by any governmental authority, central bank or
         comparable agency charged with the interpretation or administration
         thereof, or any request or directive regarding capital adequacy
         (whether or not having the force of law) of any such authority,
         central bank or comparable agency, has or would have the effect of
         reducing the rate of return on capital of such Bank (or its Parent) as
         a consequence of such Bank's obligations hereunder to a level below
         that which such Bank (or its Parent) could have achieved but for such
         adoption, change, request or directive (taking into consideration its
         policies with respect to capital adequacy) by an amount deemed by such
         Bank to be material, then from time to time, within 15 days after
         demand by such Bank (with a copy to the Agent), the Company shall pay
         to such Bank such additional amount or amounts as will compensate such
         Bank (or its Parent) for such reduction; provided that the Company
         shall not be obligated to compensate any Bank for any such reduction
         attributable to a period (i) more than 90 days prior to the giving of
         notice by such Bank to the Company of its intention to seek
         compensation under this subsection (b) or (ii) more than six months
         prior to the making of demand by such Bank for payment thereof in
         accordance therewith.

                 (c)      Each Bank will promptly notify the Company and the
         Agent of any event of which it has knowledge, occurring after the date
         hereof, which will entitle such Bank to compensation pursuant to this
         Section and will designate a different Applicable Lending Office if
         such designation will avoid the need for, or reduce the amount of,
         such compensation and will not, in the judgment of such Bank, be
         otherwise disadvantageous to such Bank.  A certificate of any Bank
         claiming compensation under this Section and setting forth the
         additional amount or amounts to be paid to it hereunder shall be
         conclusive in the absence of manifest error.  In determining such
         amount, such Bank may use any reasonable averaging and attribution
         methods.

                 SECTION 8.04.  Base Rate Loans Substituted for Affected
Euro-Dollar Loans.  If (i) the obligation of any Bank to make Euro-Dollar Loans
to the Company has been suspended pursuant to Section 8.02 or (ii) any Bank has
demanded compensation under Section 8.03(a) and the Company shall, by at least
five Euro-Dollar Business Days' prior notice to such Bank through the Agent,
have elected that the provisions of this Section shall apply to such Bank,
then, unless and until such Bank notifies the Company that the circumstances
giving rise to such suspension or demand for compensation no longer apply:





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                 (a)      all Loans to the Company which would otherwise be
         made by such Bank as, or be Converted by such Bank as or into,
         Euro-Dollar Loans shall instead be made as, or Converted into, Base
         Rate Loans (on which interest and principal shall be payable
         contemporaneously with the related Euro-Dollar Loans of the other
         Banks), and

                 (b)      after each of its Euro-Dollar Loans to the Company
         has been repaid, all payments of principal which would otherwise be
         applied to repay such Euro-Dollar Loans shall be applied to repay its
         Base Rate Loans instead.

                 SECTION 8.05.  Substitution of Bank.  If (i) the obligation of
any Bank to make Euro-Dollar Loans has been suspended pursuant to Section 8.02,
(ii) any Bank has demanded compensation under Section 8.03 or payment of Taxes
or Other Taxes under Section 2.17, or (iii) after satisfaction of all
applicable conditions precedent, any Bank fails to fund when due any Loan it is
obligated to fund under this Agreement, the Company shall have the right, with
the assistance of the Agent, to seek a mutually satisfactory substitute bank or
banks (which may be one or more of the Banks) to purchase the Notes and assume
the Commitment of such Bank (any such Bank is herein called an "Affected
Bank").  Each Affected Bank agrees to sell, without recourse, all of its
Commitment, its interest in this Agreement and its Note to any such bank for an
amount equal to the sum of the outstanding unpaid principal of and accrued
interest on the Loans of such Affected Bank and all commitment fees and other
fees and amounts due such Affected Bank hereunder, calculated, in each case, to
the date such Commitment, interest in this Agreement and Note are purchased.


                                   ARTICLE IX

                                 MISCELLANEOUS

                 SECTION 9.01.  Notices.  All notices, requests and other
communications to any party hereunder shall be in writing (including bank wire,
telex, facsimile transmission or similar writing) and shall be given to such
party: (x) in the case of the Company or the Agent, at its address or telex
number set forth on the signature pages hereof, (y) in the case of any Bank, at
its address or telex number set forth in its Administrative Questionnaire or
(z) in the case of any party, such other address or telex number as such party
may hereafter specify for the purpose by notice to the Agent and the Company.
Each such notice, request or other communication shall be effective (i) if
given by telex, when such telex is transmitted to the telex number specified in
this Section and the appropriate answer-back is received, (ii) if given by
mail, 72 hours after such communication is deposited in the mails with first
class postage prepaid, addressed as aforesaid, (iii) if given by facsimile
transmission, when such facsimile is transmitted and accompanied by a telephone
call to the party receiving such transmission or (iv) if given by any other
means, when delivered at the address specified in this Section; provided that
notices to the Agent shall not be effective until received.





                                       54
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                 SECTION 9.02.  No Waivers.  No failure or delay by the Agent
or any Bank in exercising any right, power or privilege under any Financing
Document shall operate as a waiver thereof nor shall any single or partial
exercise thereof preclude any other or further exercise thereof or the exercise
of any other right, power or privilege.  The rights and remedies provided in
the Financing Documents shall be cumulative and not exclusive of any rights or
remedies provided by law.

                 SECTION 9.03.  Expenses; Indemnification.  (a) The Company
shall pay (i) all reasonable documented out-of-pocket costs and expenses of
the Agent and the Arranger incurred in connection with the syndication of this
Agreement or the preparation of the Financing Documents, any waiver or consent
thereunder or any amendment thereof or any Default or alleged Default hereunder
and (ii) if an Event of Default occurs, all reasonable out-of-pocket costs and
expenses incurred by the Agent or incurred by any Bank, including fees and
disbursements of counsel, in connection with such Event of Default and
collection and other enforcement proceedings resulting therefrom.

                 (b)      The Company agrees to indemnify the Agent, each
         Co-Agent, the Arranger and each Bank and hold the Agent, each
         Co-Agent, the Arranger and each Bank harmless from and against any and
         all liabilities, losses, damages, costs and expenses of any kind
         (including, without limitation, the reasonable fees and disbursements
         of counsel for the Agent, any Co-Agent, the Arranger or any Bank in
         connection with any investigative, administrative or judicial
         proceedings, whether or not the Agent, such Co-Agent, the Arranger or
         such Bank, as the case may be, shall be designated a party thereto)
         which may be incurred by the Agent, any Co-Agent, the Arranger or any
         Bank, relating to or arising out of this Agreement or any actual or
         proposed use of proceeds of Loans hereunder, including specifically,
         without limitation, all liabilities, losses, damages, costs and
         expenses arising out of a violation of any Environmental Law; provided
         that neither the Agent nor any Co-Agent nor the Arranger nor any Bank
         shall have the right to be indemnified hereunder for its own gross
         negligence or willful misconduct as determined by a court of competent
         jurisdiction (IT BEING EXPRESSLY UNDERSTOOD AND AGREED THAT, EXCEPT
         FOR SUCH NEGLIGENCE AS IS SO DETERMINED TO CONSTITUTE GROSS
         NEGLIGENCE, SUCH INDEMNIFICATION DOES EXTEND TO THE CONSEQUENCES OF
         THE ORDINARY NEGLIGENCE, WHETHER SOLE OR CONTRIBUTORY, OF THE
         INDEMNITEE).

                 (c)      Within a reasonable period of time after any Person
         entitled to indemnification under Section 9.03(b) (an "Indemnified
         Person") receives actual notice of the assertion of any claim or the
         commencement of any action, or any threatened claim or action, covered
         by Section 9.03(b), such Indemnified Person shall, if indemnification
         with respect thereof is to be sought from the Company under Section
         9.03(b), notify the Company in writing of such claim or action;
         provided that the failure to so notify the Company shall not relieve
         the Company from any liability which the Company may have to the
         Indemnified Person under Section 9.03(b) unless the obligations of the
         Company under Section 9.03(b) have been significantly increased as a
         result of such failure.  The Company and such Indemnified Person shall
         cooperate in the defense





                                       55
   60
         of any such claim or action and shall take those actions reasonably
         within their power to take which are necessary to preserve any legal
         defenses to such matters.  If any such claim or action shall be
         brought or threatened against an Indemnified Person, so long as no
         Event of Default exists, the Company shall be entitled to participate
         in the defense thereof, and, with the consent of such Indemnified
         Person, to assume the defense thereof with counsel reasonably
         satisfactory to the Indemnified Person.  Notwithstanding any provision
         hereof to the contrary, no consent order or settlement shall be
         entered into in any such claim or action unless both the Company and
         such Indemnified Person have given their prior written consent
         thereto; provided that such consent of the Company shall not be
         required if any Event of Default exists.

                 (d)      All obligations of the Company to indemnify or
         otherwise to make payments to the Agent, any Co-Agent, the Arranger or
         any Bank provided in this Agreement shall survive any termination of
         the Commitments and the repayment of the Loans.

                 SECTION 9.04.  Sharing of Set-Offs, Etc.  Each Bank agrees
that if it shall, by exercising any right of set-off or counterclaim or
otherwise, receive payment of a proportion of the aggregate amount of principal
and interest due with respect to any Note held by it which is greater than the
proportion received by any other Bank in respect of the aggregate amount of
principal and interest due with respect to any Note held by such other Bank,
the Bank receiving such proportionately greater payment shall purchase such
participations in the Notes held by the other Banks, and such other adjustments
shall be made, as may be required so that all such payments of principal and
interest with respect to the Notes held by the Banks shall be shared by the
Banks pro rata; provided that nothing in this Section shall impair the right of
any Bank to exercise any right of set-off or counterclaim it may have and to
apply the amount subject to such exercise to the payment of indebtedness of the
Company other than its indebtedness under the Notes.  The Company agrees, to
the fullest extent it may effectively do so under applicable law, that any
holder of a participation in a Note, whether or not acquired pursuant to the
foregoing arrangements, may exercise rights of set-off or counterclaim and
other rights with respect to such participation as fully as if such holder of a
participation were a direct creditor of the Company in the amount of such
participation.

                 SECTION 9.05.  Amendments and Waivers.  Any provision of this
Agreement or the Notes may be amended or waived, if, but only if, such
amendment or waiver is in writing and is signed by the Company and the Required
Banks (and, if the rights or duties of the Agent are affected thereby, by the
Agent); provided that no such amendment or waiver shall, unless signed by all
the Banks, (i) increase or decrease the Commitment of any Bank or subject any
Bank to any additional obligation, (ii) reduce the principal of or rate of
interest on any Loan or any fees hereunder, (iii) postpone the date fixed for
any payment of principal of or interest on any Loan or any fees hereunder or
for any reduction or termination of any Commitment, or (iv) change the
percentage of the Commitments or of the aggregate unpaid principal amount of
the Notes, or the number of Banks, which shall be required for the Banks or any
of them to take any action under this Section or any other provision of this
Agreement.





                                       56
   61
                 SECTION 9.06.  Successors and Assigns.

                 (a)      The provisions of this Agreement shall be binding
         upon and inure to the benefit of the parties hereto and their
         respective successors and assigns, except that the Company may not
         assign or otherwise transfer any of its rights under this Agreement
         without the prior written consent of all Banks.

                 (b)      Any Bank may at any time and from time to time grant
         to one or more banks or other institutions (each a "Participant")
         participating interests in its Commitment or any or all of its Loans.
         In the event of any such grant by a Bank of a participating interest
         to a Participant, whether or not upon notice to the Company and the
         Agent, such Bank shall remain responsible for the performance of its
         obligations hereunder, and the Company and the Agent shall continue to
         deal solely and directly with such Bank in connection with such Bank's
         rights and obligations under this Agreement.  Any agreement pursuant
         to which any Bank may grant such a participating interest shall
         provide that such Bank shall retain the sole right and responsibility
         to enforce the obligations of the Company hereunder including, without
         limitation, the right to approve any amendment, modification or waiver
         of any provision of this Agreement; provided that such participation
         agreement may provide that such Bank will not agree to any
         modification, amendment or waiver of this Agreement described in
         clause (i), (ii) or (iii) of Section 9.05 without the consent of the
         Participant.  The Company agrees that each Participant shall, to the
         extent provided in its participation agreement, be entitled to the
         benefits of Article VIII with respect to its participating interest.
         An assignment or other transfer which is not permitted by subsection
         (c) or (d) below shall be given effect for purposes of this Agreement
         only to the extent of a participating interest granted in accordance
         with this subsection (b).

                 (c)      Any Bank may at any time assign to one or more banks
         or other institutions (each an "Assignee") a proportionate part of all
         of its rights and obligations under this Agreement and the Notes in an
         amount which equals $2,000,000 or more, and such Assignee shall assume
         such rights and obligations under this Agreement and the Notes,
         pursuant to an Assignment executed by such Assignee and such
         transferor Bank, with (and subject to) the subscribed consent of the
         Company and the Agent (which such consents shall not be unreasonably
         withheld); provided that if an Assignee is an affiliate of such
         transferor Bank or is another Bank, no such consent of the Company
         shall be required; provided further that each such assignment shall be
         of a constant, and not a varying, percentage of all rights and
         obligations under this Agreement and the Notes.  Upon execution and
         delivery of such instrument (and delivery to the Agent of an
         Administrative Questionnaire with respect to such Assignee, if such
         Assignee has not already done so) and payment by such Assignee to such
         transferor Bank of an amount equal to the purchase price agreed
         between such transferor Bank and such Assignee, such Assignee shall be
         a Bank party to this Agreement and shall have all the rights and
         obligations of a Bank with a Commitment as set forth in such
         instrument of assumption, and the transferor Bank shall be released
         from its obligations hereunder to a corresponding extent, and no
         further consent or action by any party shall be required.  Upon the
         consummation of any assignment pursuant to this subsection (c), the
         transferor Bank, the Agent and





                                       57
   62
         the Company shall make appropriate arrangements so that, if required,
         a new Note is issued to the Assignee.  In connection with any such
         assignment, the transferor Bank shall pay to the Agent for its account
         an administrative fee for processing such assignment in the amount of
         $2,500.  If the Assignee is not incorporated under the laws of the
         United States of America or a state thereof, it shall, prior to the
         first date on which interest or fees are payable hereunder for its
         account, deliver to the Company and the Agent certification as to
         exemption from deduction or withholding of any United States federal
         income taxes in accordance with Section 2.17.  Notwithstanding the
         first sentence of this subsection (c), a Bank may not make an
         assignment pursuant to this subsection (c) if after giving effect
         thereto such Bank would hold less than 1.5% (or until March 1, 1999,
         3% in the case of NationsBank, Bank of America National Trust and
         Savings Association and Union Bank of Switzerland, Houston Agency) of
         the Commitments (for this purpose such Bank shall be deemed to hold
         any participating interests granted by such Bank pursuant to
         subsection (b) above and any rights assigned pursuant to subsection
         (d) below).

                 (d)      Any Bank may at any time assign all or any portion of
         its rights under this Agreement and its Note to a Federal Reserve
         Bank.  No such assignment shall release the transferor Bank from its
         obligations hereunder.

                 (e)      No Assignee, Participant or other transferee of any
         Bank's rights shall be entitled to receive any greater payment under
         Section 8.03 than such Bank would have been entitled to receive with
         respect to the rights transferred, unless such transfer is made with
         the Company's prior written consent or by reason of the provisions of
         Section 8.02 or 8.03 requiring such Bank to designate a different
         Applicable Lending Office under certain circumstances or at a time
         when the circumstances giving rise to such greater payment did not
         exist.

                 SECTION 9.07.  Collateral.  Each of the Banks represents to
each Agent and each of the other Banks that it in good faith is not relying
upon any margin stock (as defined in Regulation G) or any margin stock (as
defined in Regulation U) as collateral in the extension or maintenance of the
credit provided for in this Agreement.

                 SECTION 9.08.  Texas Law.  This Agreement and each Note shall
be construed in accordance with and governed by the law of the State of Texas.

                 SECTION 9.09.  CONSENT TO JURISDICTION.  THE COMPANY HEREBY
IRREVOCABLY CONSENTS TO THE NONEXCLUSIVE JURISDICTION OF THE COURTS OF THE
STATE OF TEXAS AND OF ANY FEDERAL COURT LOCATED IN SUCH STATE OVER IT IN
CONNECTION WITH ANY ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO ANY
FINANCING DOCUMENT AND, TO THE FULLEST EXTENT PERMITTED BY LAW, FURTHER AGREES
(AND SHALL NOT CONTEST) THAT THE PROPER VENUE FOR FILING AND MAINTAINING ANY
SUCH ACTION OR PROCEEDING SHALL BE IN THE STATE OF TEXAS.  IN ANY SUCH ACTION
OR PROCEEDING, THE COMPANY WAIVES PERSONAL SERVICE OF ANY





                                       58
   63
SUMMONS, COMPLAINT OR OTHER PROCESS OR NOTICE AND AGREES THAT SERVICE BY FIRST
CLASS MAIL, RETURN RECEIPT REQUESTED, TO THE COMPANY AT ITS ADDRESS FOR NOTICES
HEREUNDER, OR ANY FORM OF SERVICE PROVIDED FOR IN THE TEXAS CIVIL PRACTICE AND
REMEDIES CODE THEN IN EFFECT SHALL CONSTITUTE GOOD AND SUFFICIENT SERVICE UPON
THE COMPANY.

                 SECTION 9.10.  Counterparts.  This Agreement may be signed in
any number of counterparts, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.

                 SECTION 9.11.  WAIVER OF JURY TRIAL.  THE COMPANY, THE AGENT,
THE CO-AGENTS AND THE BANKS HEREBY IRREVOCABLY WAIVE ANY AND ALL RIGHT TO TRIAL
BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR
THE TRANSACTIONS CONTEMPLATED HEREBY.

                 SECTION 9.12.  COMPLETE AGREEMENT.  THIS WRITTEN CREDIT
AGREEMENT AND THE OTHER FINANCING DOCUMENTS REPRESENT THE FINAL AGREEMENT AMONG
THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS,
OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL
AGREEMENTS AMONG THE PARTIES.

                 SECTION 9.13.  Liability of Co-Agents and Arranger.  Neither
the Arranger nor either Co-Agent, in its capacity as Co-Agent hereunder, shall
have any duty or responsibility hereunder.

                 SECTION 9.14.  Termination of 1997 Short-Term Commitments.
Each of the parties hereto acknowledges that the Revolving Credit Period (as
defined in the $100,000,000 Credit Agreement dated as of March 11,  1997 among
the Company, NationsBank, as agent and the co-agent and lenders parties
thereto) ended at the close of business on March 9, 1998 pursuant to the terms
of such Credit Agreement, and the Company has no further right to borrow
thereunder.  The Company represents and warrants that all principal, interest
and fees owed thereunder will be paid in full on the Effective Date.





                                       59
   64
                 IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed by their respective authorized officers as of the
day and year first above written.

                                  UNION TEXAS PETROLEUM HOLDINGS, INC.


                                  By: /s/ M.N. MARKOWITZ    
                                      ---------------------------------
                                          M.N. Markowitz
                                          Vice President and Treasurer
                                          1330 Post Oak Blvd.
                                          Houston, Texas 77056
                                          Telex number: 762255

Commitments
- -----------

$10,757,575.72                    NATIONSBANK OF TEXAS, N.A.
                                  
                                  
                                  By: /s/ MARION B. LEMAN
                                      ---------------------------------
                                          Marion B. Leman
                                          Vice President
                                  
                                  
$5,909,090.91                     BANK OF AMERICA NATIONAL TRUST AND SAVINGS 
                                  ASSOCIATION
                                  
                                  
                                  By: /s/ [ILLEGIBLE]
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$8,257,575.76                     UNION BANK OF SWITZERLAND, HOUSTON AGENCY
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
                                  
                                  

                                       60
   65
$4,545,454.55                     THE BANK OF NOVA SCOTIA
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     THE BANK OF TOKYO-MITSUBISHI, LTD.,
                             HOUSTON AGENCY
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$8,257,575.76                     THE CHASE MANHATTAN BANK
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     CITIBANK, N.A.
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     CREDIT LYONNAIS NEW YORK BRANCH
                                  
                                  
                                  By: /s/ [ILLEGIBLE] 
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  



                                       61
   66
Commitments
- -----------

                                  
$4,545,454.55                     THE FIRST NATIONAL BANK OF CHICAGO
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     LTCB TRUST COMPANY
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$5,909,090.91                     MELLON BANK, N.A.
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     MORGAN GUARANTY TRUST COMPANY OF 
                                  NEW YORK
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  
$4,545,454.55                     NATIONAL WESTMINSTER BANK PLC NEW YORK 
                                  BRANCH
                                  
                                  
                                  By: /s/ [ILLEGIBLE]                           
                                      ---------------------------------
                                          Authorized Officer
                                  
                                  



                                       62
   67
Commitments
- -----------


                                      NATIONAL WESTMINSTER BANK PLC 
                                      NASSAU BRANCH
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$4,545,454.55                         SOCIETE GENERALE, SOUTHWEST AGENCY
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$4,090,909.09                         NATEXIS BANQUE - BFCE
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$3,181,818.18                         BANK OF TAIWAN, NEW YORK AGENCY
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
                                      

                                      63
   68
Commitments
- -----------


$3,181,818.18                         BANQUE NATIONALE DE PARIS, HOUSTON AGENCY
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$3,181,818.18                         BANQUE PARIBAS, HOUSTON AGENCY
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
                                      By: /s/ [ILLEGIBLE]             
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$3,181,818.18                         DRESDNER BANK AG, NEW YORK AND GRAND 
                                      CAYMAN BRANCHES
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
$3,181,818.18                         THE MITSUBISHI TRUST & BANKING    
                                      CORPORATION
                                      
                                      
                                      By: /s/ [ILLEGIBLE]
                                          ---------------------------------
                                               Authorized Officer
                                      
                                      
Total Commitments:  $100,000,000.00
                    ---------------




                                       64
   69
Commitments
- -----------




                                        NATIONSBANK OF TEXAS, N.A., as Agent
                                        
                                        
                                        By: /s/ MARION B. LEMAN
                                            --------------------------------
                                                Marion B. Leman
                                                Vice President
                                                  700 Louisiana Street
                                                  Houston, Texas  77002
                                                  Telex Number:  163244
                                                  Answerback:  NCNBTEXDAL
                                        
                                        
                                        BANK OF AMERICA NATIONAL TRUST AND 
                                        SAVINGS ASSOCIATION, as Co-Agent
                                        
                                        
                                        By: /s/ [ILLEGIBLE]                     
                                            --------------------------------
                                                 Authorized Officer
                                        
                                        
                                        UNION BANK OF SWITZERLAND, HOUSTON 
                                        AGENCY, as Co-Agent
                                        
                                        
                                        By: /s/ [ILLEGIBLE]                     
                                            --------------------------------
                                                 Authorized Officer
                                        
                                        
                                        By: /s/ [ILLEGIBLE]                     
                                            --------------------------------
                                                 Authorized Officer
                                        
                                        
                                        


                                       65
   70

             $100,000,000 CREDIT AGREEMENT DATED March 10, 1998
                            SCHEDULE OF EXHIBITS


The following describes the Schedules and Exhibits to the Credit Agreement,
which are omitted herein, but which will be furnished upon request:

Schedule I       Sets forth the Facility Fee and applicable Margin at various
                 Rating Levels.

Schedule II      Part A lists the Existing Unrestricted Subsidiaries and
                 Existing Unimar Unrestricted Subsidiaries.  Part B lists the
                 Existing Restricted Subsidiaries, Other Restricted Subsidiary
                 and Existing Unimar Restricted Subdidiaries.

Schedule III     Part A describes Liens on ownership interests.  Part B
                 describes other existing Liens.

Schedule IV      Describes certain existing restrictions.

Schedule V       Sets forth the Joint Venture Debt Agreements.

Schedule VI      Describes outstanding options.

Exhibit A        Form of Note

Exhibit B        Form of Assignment and Assumption Agreement

Exhibit C        Opinion of General Counsel to the Company

Exhibit D        Opinion of Special Counsel to the Company

Exhibit E        Opinion of Special Counsel to the Agent