Document:

<PAGE>

                                                                    EXHIBIT 10.2

                  FIRST AMENDMENT TO COMBINED CREDIT AGREEMENTS

      THIS FIRST AMENDMENT TO COMBINED CREDIT AGREEMENTS, dated and effective as
of May 28, 2004 (the "Amendment"), among Apache Corporation, a Delaware
corporation (the "U.S. Borrower"), Apache Energy Limited (ACN 009 301 964), a
corporation organized under the laws of the State of Western Australia,
Australia (the "Australian Borrower"), Apache Canada Ltd., a corporation
organized under the laws of the province of Alberta (the "Canadian Borrower"),
each of the lenders that is a signatory to the U.S. Credit Agreement (as herein
defined) (the "U.S. Lenders"), each of the lenders that is a signatory to the
Australian Credit Agreement (as herein defined) (the "Australian Lenders"), each
of the lenders that is a signatory to the Canadian Credit Agreement (as herein
defined) (the "Canadian Lenders", and together with the U.S. Lenders and the
Australian Lenders, the "Combined Lenders"), JPMorgan Chase Bank, as Global
Administrative Agent (in such capacity, together with its successors in such
capacity, the "Global Administrative Agent"), Bank of America, N.A., as Global
Syndication Agent, Citibank, N.A., as Global Documentation Agent, and such other
agents as are party to the Combined Credit Agreements (as herein defined).

                              W I T N E S S E T H:

      1.    The U.S. Borrower, the Global Administrative Agent, the Global
Syndication Agent, the Global Documentation Agent, the other agents party
thereto, and the U.S. Lenders are parties to that certain Credit Agreement,
dated as of June 3, 2002 (the "U.S. Credit Agreement"), pursuant to which the
U.S. Lenders agreed to make loans to and extensions of credit on behalf of the
U.S. Borrower.

      2.    The Australian Borrower, the Global Administrative Agent, the Global
Syndication Agent, the Global Documentation Agent, the other agents party
thereto, and the Australian Lenders are parties to that certain Credit
Agreement, dated as of June 3, 2002 (the "Australian Credit Agreement"),
pursuant to which the Australian Lenders agreed to make loans to and extensions
of credit on behalf of the Australian Borrower.

      3.    The Canadian Borrower, the Global Administrative Agent, the Global
Syndication Agent, the Global Documentation Agent, the other agents party
thereto, and the Canadian Lenders are parties to that certain Credit Agreement,
dated as of June 3, 2002 (the "Canadian Credit Agreement" and, together with the
U.S. Credit Agreement and the Australian Credit Agreement, the "Combined Credit
Agreements"), pursuant to which the Canadian Lenders agreed to make loans to and
extensions of credit on behalf of the Canadian Borrower.

      4.    The 364-Day Credit Agreement, dated as of June 3, 2002 (which
previously was one of the Combined Credit Agreements) has terminated pursuant to
its terms.

      5.    The U.S. Borrower, the Australian Borrower and the Canadian Borrower
have requested various amendments to the Combined Credit Agreement as set forth
herein.

      6.    Subject to the terms and conditions of this Amendment, the parties
hereto are willing to enter into this Amendment.

<PAGE>

      NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained, the parties hereto agree as follows:

      SECTION 1. Defined Terms. All capitalized terms used but not otherwise
defined herein shall have the meanings given in the U.S. Credit Agreement, as
amended by this Amendment.

      SECTION 2. Amendments to U.S. Credit Agreement.

      a.    The definitions of "Combined Credit Agreements", "Combined Lenders",
"Combined Loan Documents" and "Combined Loans" set forth in Section 1.1 of the
U.S. Credit Agreement hereby are amended in their entirety to read as follows:

            " "Combined Credit Agreements" means this Agreement, the Australian
      Credit Agreement and the Canadian Credit Agreement.

            "Combined Lenders" means the Lenders hereunder, the Australian
      Lenders and the Canadian Lenders.

            "Combined Loan Documents" means the Loan Documents, the Australian
      Loan Documents and the Canadian Loan Documents.

            "Combined Loans" means the loans made by the Combined Lenders to
      Borrower, Australian Borrower and Canadian Borrower pursuant to the
      Combined Loan Documents."

      b.    The definition of "Combined Commitments" set forth in Section 1.1 of
the U.S. Credit Agreement hereby is amended by deleting the parenthetical "(as
defined in this Agreement, the Canadian Credit Agreement and the 364-Day Credit
Agreement)" and replacing such parenthetical with "(as defined in this Agreement
and the Canadian Credit Agreement)".

      c.    The definition of "364-Day Borrower", "364-Day Credit Agreement",
"364-Day Lenders" and "364-Day Loan Documents" set forth in Section 1.1 of the
U.S. Credit Agreement hereby are deleted in their entirety.

      d.    Section 1.1 of the U.S. Credit Agreement hereby is amended by
inserting the following definition of "Consolidated Assets" in appropriate
alphabetical order:

            " "Consolidated Assets" means the total assets of the Borrower and
      its subsidiaries which would be shown as assets on a consolidated balance
      sheet of Borrower and its subsidiaries prepared in accordance with GAAP."

      e.    Section 3.4 of the U.S. Credit Agreement hereby is amended by
deleting the reference to "$25,000,000" and replacing such reference with
"$100,000,000".

      f.    Section 4.1(h) of the U.S. Credit Agreement hereby is amended in its
entirety to read as follows:

                                       2
<PAGE>

            " (h) Other Combined Credit Agreements. The Global Administrative
      Agent shall have received copies of the executed (i) Australian Credit
      Agreement and the other Australian Loan Documents and (ii) Canadian Credit
      Agreement and the other Canadian Loan Documents."

      g.    Section 5.1(f) of the U.S. Credit Agreement hereby is amended by
deleting the reference to "$25,000,000" and replacing such reference with
"$100,000,000".

      h.    Section 5.6 of the U.S. Credit Agreement hereby is amended in its
entirety to read as follows:

            " SECTION 5.6 [Intentionally omitted]."

      i.    Section 6.1 of the U.S. Credit Agreement hereby is amended in its
entirety to read as follows:

            " SECTION 6.1 [Intentionally omitted]."

      j.    Section 7.1(xiv) of the U.S. Credit Agreement hereby is amended in
its entirety to read as follows:

            " (xiv) in addition to Liens permitted by clauses (i) through (xiii)
      above, Liens on property or assets of the Borrower and its Subsidiaries if
      the aggregate Indebtedness of all such Persons secured thereby does not
      exceed five percent (5%) of Borrower's Consolidated Assets; provided that
      nothing in this definition shall in and of itself constitute or be deemed
      to constitute an agreement or acknowledgment by the Administrative Agent
      or any Lender that the Indebtedness subject to or secured by any such Lien
      ranks (apart from the effect of any Lien included in or inherent in any
      such Liens) in priority to the Obligations."

      k.    Sections 8.1(e), (f) and (h) of the U.S. Credit Agreement hereby are
amended by deleting each reference to "$25,000,000" and replacing such
references with "$100,000,000".

      l.    Section 8.1(j) of the U.S. Credit Agreement hereby is amended in its
entirety to read as follows:

            " (j) Event of Default under other Combined Loan Documents. Any
      "Event of Default" as defined in the Australian Loan Documents or the
      Canadian Loan Documents shall occur; provided that the occurrence of a
      "Default" as defined in the Australian Loan Documents or the Canadian Loan
      Documents shall constitute a Default under this Agreement; provided
      further that if such "Default" is cured or waived under the Australian
      Loan Documents or the Canadian Loan Documents, as applicable, then such
      "Default" shall no longer constitute a Default under this Agreement."

                                       3
<PAGE>

            SECTION 3. Amendments to Australian Credit Agreement.

      a.    The definitions of "Combined Credit Agreements", "Combined Lenders",
"Combined Loan Documents" and "Combined Loans" set forth in Section 1.1 of the
Australian Credit Agreement hereby are amended in their entirety to read as
follows:

            " "Combined Credit Agreements" means this Agreement, the U.S. Credit
      Agreement and the Canadian Credit Agreement.

            "Combined Lenders" means the Lenders hereunder, the U.S. Lenders and
      the Canadian Lenders.

            "Combined Loan Documents" means the Loan Documents, the U.S. Loan
      Documents and the Canadian Loan Documents.

            "Combined Loans" means the loans made by the Combined Lenders to
      Borrower, U.S. Borrower and Canadian Borrower pursuant to the Combined
      Loan Documents."

      b.    The definition of "Combined Commitments" set forth in Section 1.1 of
the Australian Credit Agreement hereby is amended by deleting the parenthetical
"(as defined in the U.S. Credit Agreement, the Canadian Credit Agreement and the
364-Day Credit Agreement)" and replacing such parenthetical with "(as defined in
the U.S. Credit Agreement and the Canadian Credit Agreement)".

      c.    The definition of "364-Day Borrower", "364-Day Credit Agreement",
"364-Day Lenders" and "364-Day Loan Documents" set forth in Section 1.1 of the
Australian Credit Agreement hereby are deleted in their entirety.

      d.    Section 1.1 of the Australian Credit Agreement hereby is amended by
inserting the following definition of "Consolidated Assets" in appropriate
alphabetical order:

            " "Consolidated Assets" means the total assets of the Parent and its
      subsidiaries which would be shown as assets on a consolidated balance
      sheet of Parent and its subsidiaries prepared in accordance with GAAP."

      e.    Section 3.4 of the Australian Credit Agreement hereby is amended by
deleting the reference to "$25,000,000" and replacing such reference with
"$100,000,000".

      f.    Section 4.1(h) of the Australian Credit Agreement hereby is amended
in its entirety to read as follows:

            " (h) Other Combined Credit Agreements. The Australian
      Administrative Agent shall have received copies of the executed (i) U.S.
      Credit Agreement and the other U.S. Loan Documents and (ii) Canadian
      Credit Agreement and the other Canadian Loan Documents."

      g.    Section 5.6 of the Australian Credit Agreement hereby is amended in
its entirety to read as follows:

                                       4
<PAGE>

            " SECTION 5.6 [Intentionally omitted]."

      h.    Section 6.1 of the Australian Credit Agreement hereby is amended in
its entirety to read as follows:

            " SECTION 6.1 [Intentionally omitted]."

      i.    Section 7.1(xiv) of the Australian Credit Agreement hereby is
amended in its entirety to read as follows:

            " (xiv) in addition to Liens permitted by clauses (i) through (xiii)
      above, Liens on property or assets of Parent, Borrower and any of their
      Subsidiaries if the aggregate Indebtedness of all such Persons secured
      thereby does not exceed five percent (5%) of Parent's Consolidated Assets;
      provided that nothing in this definition shall in and of itself constitute
      or be deemed to constitute an agreement or acknowledgment by the
      Administrative Agent or any Lender that the Indebtedness subject to or
      secured by any such Lien ranks (apart from the effect of any Lien included
      in or inherent in any such Liens) in priority to the Obligations."

      j.    Sections 8.1(e), (h) and (k) of the Australian Credit Agreement
hereby are amended by deleting each reference to "$25,000,000" and replacing
such references with "$100,000,000".

      k.    Section 8.1(j) of the Australian Credit Agreement hereby is amended
in its entirety to read as follows:

            " (j) Event of Default under other Combined Loan Documents. Any
      "Event of Default" as defined in the U.S. Loan Documents or the Canadian
      Loan Documents shall occur; provided that the occurrence of a "Default" as
      defined in the U.S. Loan Documents or the Canadian Loan Documents shall
      constitute a Default under this Agreement; provided further that if such
      "Default" is cured or waived under the U.S. Loan Documents or the Canadian
      Loan Documents, as applicable, then such "Default" shall no longer
      constitute a Default under this Agreement."

            SECTION 4. Amendments to Canadian Credit Agreement.

      a.    The definitions of "Combined Credit Agreements", "Combined Lenders",
"Combined Loan Documents" and "Combined Loans" set forth in Section 1.1 of the
Canadian Credit Agreement hereby are amended in their entirety to read as
follows:

            " "Combined Credit Agreements" means this Agreement, the Australian
      Credit Agreement and the U.S. Credit Agreement.

            "Combined Lenders" means the Lenders hereunder, the Australian
      Lenders and the U.S. Lenders.

            "Combined Loan Documents" means the Loan Documents, the Australian
      Loan Documents and the U.S. Loan Documents.

                                       5
<PAGE>

            "Combined Loans" means the loans made by the Combined Lenders to
      Borrower, U.S. Borrower and Australian Borrower pursuant to the Combined
      Loan Documents."

      b.    The definition of "Combined Commitments" set forth in Section 1.1 of
the Canadian Credit Agreement hereby is amended by deleting the parenthetical
"(as defined in this Agreement, the U.S. Credit Agreement and the 364-Day Credit
Agreement)" and replacing such parenthetical with "(as defined in this Agreement
and the U.S. Credit Agreement)".

      c.    The definition of "364-Day Borrower", "364-Day Credit Agreement",
"364-Day Lenders" and "364-Day Loan Documents" set forth in Section 1.1 of the
Canadian Credit Agreement hereby are deleted in their entirety.

      d.    Section 1.1 of the Canadian Credit Agreement hereby is amended by
inserting the following definition of "Consolidated Assets" in appropriate
alphabetical order:

            " "Consolidated Assets" means the total assets of the Parent and its
      subsidiaries which would be shown as assets on a consolidated balance
      sheet of Parent and its subsidiaries prepared in accordance with GAAP."

      e.    Section 3.4 of the Canadian Credit Agreement hereby is amended by
deleting the reference to "$25,000,000" and replacing such reference with
"$100,000,000".

      f.    Section 4.1(h) of the Canadian Credit Agreement hereby is amended in
its entirety to read as follows:

            " (h) Other Combined Credit Agreements. The Canadian Administrative
      Agent shall have received copies of the executed (i) U.S. Credit Agreement
      and the other U.S. Loan Documents and (ii) Australian Credit Agreement and
      the other Australian Loan Documents."

      g.    Section 5.6 of the Canadian Credit Agreement hereby is amended in
its entirety to read as follows:

            " SECTION 5.6 [Intentionally omitted]."

      h.    Section 6.1 of the Canadian Credit Agreement hereby is amended in
its entirety to read as follows:

            " SECTION 6.1 [Intentionally omitted]."

      i.    Section 7.1(xvii) of the Canadian Credit Agreement hereby is amended
in its entirety to read as follows:

            " (xvii) in addition to Liens permitted by clauses (i) through (xvi)
      above, Liens on property or assets of Parent, Borrower and any of their
      Subsidiaries if the aggregate Indebtedness of all such Persons secured
      thereby does not exceed five percent (5%) of Parent's Consolidated Assets;
      provided that nothing in this definition shall in and of itself constitute
      or be deemed to constitute an agreement

                                       6
<PAGE>

      or acknowledgment by the Administrative Agent or any Lender that the
      Indebtedness subject to or secured by any such Lien ranks (apart from the
      effect of any Lien included in or inherent in any such Liens) in priority
      to the Obligations."

      j.    Sections 8.1(e) and (h) of the Canadian Credit Agreement hereby are
amended by deleting each reference to "$25,000,000" and replacing such
references with "$100,000,000".

      k.    Section 8.1(j) of the Canadian Credit Agreement hereby is amended in
its entirety to read as follows:

            " (j) Event of Default under other Combined Loan Documents. Any
      "Event of Default" as defined in the U.S. Loan Documents or the Australian
      Loan Documents shall occur; provided that the occurrence of a "Default" as
      defined in the U.S. Loan Documents or the Australian Loan Documents shall
      constitute a Default under this Agreement; provided further that if such
      "Default" is cured or waived under the U.S. Loan Documents or the
      Australian Loan Documents, as applicable, then such "Default" shall no
      longer constitute a Default under this Agreement."

      SECTION 5. Effectiveness. This Amendment shall become effective as of May
28, 2004 provided that the Global Administrative Agent shall have received
counterparts hereof duly executed by the Borrower, the Global Administrative
Agent, the Australian Administrative Agent, the Canadian Administrative Agent,
the Combined Required Lenders, "Required Lenders" under the U.S. Credit
Agreement, "Required Lenders" under the Canadian Credit Agreement and "Required
Lenders" under the Australian Credit Agreement (or, in the case of any party as
to which an executed counterpart shall not have been received, telegraphic,
telex, or other written confirmation from such party of execution of a
counterpart hereof by such party).

      SECTION 6. Reaffirmation of Representations and Warranties. To induce the
Combined Lenders, the Global Administrative Agent, the Australian Administrative
Agent and the Canadian Administrative Agent to enter into this Amendment, the
Borrower hereby reaffirm, as of the date hereof, the following, provided that
each reference to the Combined Credit Agreements below shall be deemed to refer
to such agreements as amended hereby:

                  (i)   The representations and warranties of the U.S. Borrower,
      the Australian Borrower and the Canadian Borrower, respectively, set forth
      in the Combined Credit Agreements are true and correct on and as of the
      date hereof (or, if stated to have been made expressly as of an earlier
      date, were true and correct in all material respects as of such date).

                  (ii)  Each of the U.S. Borrower and its Restricted
      Subsidiaries, the Australian Borrower and its Restricted Subsidiaries, and
      the Canadian Borrower and its Restricted Subsidiaries, respectively, is
      duly organized, validly existing and in good standing under the laws of
      the jurisdiction of their incorporation or organization and has all
      requisite authority, permits and approvals, and is in good standing to
      conduct its business in each jurisdiction in which its business is
      conducted where the failure to so qualify would have a Material Adverse
      Effect.

                                       7
<PAGE>

                  (iii) The execution, delivery and performance by the U.S.
      Borrower, the Australian Borrower and the Canadian Borrower, respectively,
      of this Amendment and each other Combined Loan Document executed or to be
      executed by it, are within such party's corporate, limited liability
      company and/or partnership powers and have been duly authorized by all
      necessary corporate, limited liability company and/or partnership action
      on behalf of it.

                  (iv)  This Amendment and each other Combined Loan Document
      executed or to be executed by it has been duly executed and delivered by
      the U.S. Borrower, the Australian Borrower and the Canadian Borrower,
      respectively, and constitutes a legal, valid and binding obligation of
      such parties enforceable in accordance with their respective terms subject
      as to enforcement only to bankruptcy, insolvency, reorganization,
      moratorium or other similar laws affecting the enforcement of creditor
      rights generally or to general principles of equity.

                  (v)   The execution, delivery and performance by each of the
      U.S. Borrower, the Australian Borrower and the Canadian Borrower,
      respectively, of this Amendment and each other Combined Loan Document
      executed or to be executed by it, do not (a) contravene such party's
      articles of incorporation or other organizational documents, as the case
      may be, or (b) contravene any material contractual restriction, law or
      governmental regulation or court decree or order binding on or affecting
      such party or any Subsidiary of such party.

                  (vi)  No Default under the Combined Loan Documents has
      occurred and is continuing and the U.S. Borrower is in compliance with the
      financial covenants set forth in Article VI of each of the Combined Credit
      Agreements.

                  (vii) No event or events have occurred which individually or
      in the aggregate could reasonably be expected to have a Material Adverse
      Effect under any of the Combined Credit Agreements.

      SECTION 7. Reaffirmation of Combined Credit Agreement. This Amendment
shall be deemed to be an amendment to the U.S. Credit Agreement, the Australian
Credit Agreement and the Canadian Credit Agreement, and the U.S. Credit
Agreement, as amended hereby, the Australian Credit Agreement, as amended
hereby, and the Canadian Credit Agreement, as amended hereby, is hereby
ratified, approved and confirmed in each and every respect. All references to
the U.S. Credit Agreement, the Australian Credit Agreement and the Canadian
Credit Agreement herein and in any other document, instrument, agreement or
writing shall hereafter be deemed to refer to the U.S. Credit Agreement, as
amended hereby, the Australian Credit Agreement, as amended hereby, and the
Canadian Credit Agreement, as amended hereby, respectively.

      SECTION 8. Reaffirmation of Guaranties. The U.S. Borrower hereby ratifies,
approves and confirms in each and every respect (i) that certain "Guaranty" (as
defined in the Australian Credit Agreement) (the "Australian Guaranty") and (ii)
that certain "Guaranty" (as defined in the Canadian Credit Agreement) (the
"Canadian Guaranty"), and agree and acknowledge that the

                                       8
<PAGE>

terms, conditions and provisions of the Australian Guaranty and the Canadian
Guaranty, respectively, shall be and remain in full force and effect.

      SECTION 9. Governing Law. THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK.

      SECTION 10. Severability of Provisions. Any provision of this Amendment
held to be invalid, illegal or unenforceable in any jurisdiction shall, as to
such jurisdiction, be ineffective to the extent of such invalidity, illegality
or unenforceability without affecting the validity, legality and enforceability
of the remaining provisions hereof; and the invalidity of a particular provision
in a particular jurisdiction shall not invalidate such provision in any other
jurisdiction.

      SECTION 11. Counterparts. This Amendment may be executed in counterparts
(and by different parties hereto on different counterparts), each of which shall
constitute an original, but all of which when taken together shall constitute a
single contract.

      SECTION 12. Headings. Article and section headings used herein are for
convenience of reference only, are not part of this Amendment and shall not
affect the construction of, or be taken into consideration in interpreting, this
Amendment.

      SECTION 13. Successors and Assigns. The provisions of this Amendment shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns permitted under the terms of the various
Combined Loan Documents.

      SECTION 14. No Oral Agreements. THIS AMENDMENT, THE COMBINED CREDIT
AGREEMENTS, AS AMENDED HEREBY, AND THE OTHER COMBINED LOAN DOCUMENTS REPRESENT
THE FINAL AGREEMENT BETWEEN 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 BETWEEN THE PARTIES.

                      [SIGNATURES BEGIN ON FOLLOWING PAGE]

                                       9
<PAGE>

      IN WITNESS WHEREOF, the Borrower, the Global Administrative Agent, the
Australian Administrative Agent, the Canadian Administrative Agent and the
Combined Lenders have executed this Amendment as of the date first above
written.

                                  U.S. BORROWER

                                  APACHE CORPORATION

                                  By:
                                     -------------------------------------------
                                  Name:  Matthew W. Dundrea
                                  Title: Vice President and Treasurer

                                  AUSTRALIAN BORROWER

                                  APACHE ENERGY LIMITED (ACN 009 301 964)

                                  By:
                                     -------------------------------------------
                                  Name:  Matthew W. Dundrea
                                  Title: Vice President and Treasurer

                                  CANADIAN BORROWER

                                  APACHE CANADA LTD.

                                  By:
                                     -------------------------------------------
                                  Name:  Matthew W. Dundrea
                                  Title: Vice President and Treasurer

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-1
<PAGE>

                                  GLOBAL AGENTS AND U.S. LENDERS

                                  JPMORGAN CHASE BANK, as Global
                                  Administrative Agent and as a U.S. Lender

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

                                  BANK OF AMERICA, N.A., as Global
                                  Syndication Agent and as a U.S. Lender

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

                                  CITIBANK, N.A., as Global
                                  Documentation Agent and as a U.S. Lender

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

                                  WACHOVIA BANK, NATIONAL
                                  ASSOCIATION, as a U.S. Lender

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

                                  UNION BANK OF CALIFORNIA, N.A., as a
                                  U.S. Lender

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

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-2
<PAGE>

                                  DEUTSCHE BANK AG NEW YORK
                                  BRANCH, as a U.S. Lender

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

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

                                  ROYAL BANK OF CANADA, as a U.S. Lender

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

                                  BNP PARIBAS, as a U.S. Lender

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

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

                                  THE BANK OF NOVA SCOTIA, ATLANTA
                                  AGENCY, as a U.S. Lender

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

                                  BANK ONE, NA (MAIN OFFICE CHICAGO),
                                  as a U.S. Lender

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

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-3
<PAGE>

                                  SOCIETE GENERALE, as a U.S. Lender

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

                                  TORONTO DOMINION (TEXAS), INC., as a
                                  U.S. Lender

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

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

                                  BAYERISCHE LANDESBANK, CAYMAN
                                  ISLANDS BRANCH, as a U.S. Lender

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

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

                                  THE ROYAL BANK OF SCOTLAND PLC, as a
                                  U.S. Lender

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

                                  ABN AMRO BANK N.V., as a U.S. Lender

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

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-4
<PAGE>

                           CALYON NEW YORK BRANCH, successor to
                           Credit Lyonnais, New York Branch, as a U.S.
                           Lender

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

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

                           SUMITOMO MITSUI BANKING
                           CORPORATION, as a U.S. Lender

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

                           WELLS FARGO BANK, NA, successor by
                           merger to Wells Fargo Bank Texas, N.A., as a U.S.
                           Lender

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

                           SOUTHWEST BANK OF TEXAS, N.A., as a U.S. Lender

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

                           THE BANK OF NEW YORK, as a U.S. Lender

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-5
<PAGE>

                                  KBC BANK, N.V., NEW YORK BRANCH, as a
                                  U.S. Lender

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

                                  ING CAPITAL LLC, as a U.S. Lender

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

                                  MERRILL LYNCH BANK USA, as a U.S.
                                  Lender

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

                                  MIZUHO CORPORATE BANK, LIMITED, as
                                  a U.S. Lender

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

                                  BANCA NAZIONALE DEL LAVORO S.P.A.,
                                  NEW YORK BRANCH, as a U.S. Lender

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

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-6
<PAGE>

                                AUSTRALIAN AGENTS AND LENDERS:

                                CITISECURITIES LIMITED (ABN 51 008 489
                                610), as Australian Administrative Agent

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

                                BANK OF AMERICA, N.A., SYDNEY
                                BRANCH (ARBN 064 874 531), as an Australian Co-
                                Syndication Agent and as an Australian Lender

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

                                DEUTSCHE BANK AG, SYDNEY BRANCH
                                (ABN 13 064 165 162), as an Australian Co-
                                Syndication Agent and as an Australian Lender

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

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

                                ROYAL BANK OF CANADA (ABN 86 076 940
                                880), as an Australian Co-Documentation Agent
                                and as an Australian Lender

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-7
<PAGE>

                                  BANK ONE, NA, AUSTRALIA BRANCH
                                  (ARBN 065 752 918), as an Australian Co-
                                  Documentation Agent and as an Australian Lende

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

                                  CITIBANK, N.A. (ARBN 072 814 058), as an
                                  Australian Lender

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

                                  JPMORGAN CHASE BANK (ARBN 074 112
                                  011), as an Australian Lender

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-8
<PAGE>

                               CANADIAN AGENTS AND LENDERS:

                               ROYAL BANK OF CANADA, as Canadian
                               Administrative Agent and as a Canadian Lender

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

                               THE BANK OF NOVA SCOTIA, as a Canadian
                               Co-Syndication Agent and as a Canadian Lender

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

                               THE TORONTO-DOMINION BANK, as a
                               Canadian Co-Syndication Agent and as a Canadian
                               Lender

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

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

                               BNP PARIBAS (CANADA), as a Canadian
                               Co-Documentation Agent and as a Canadian Lender

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

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                       S-9
<PAGE>

                                  BAYERISCHE LANDESBANK
                                  GIROZENTRALE, as a Canadian Co-
                                  Documentation Agent and as a Canadian Lender

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

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

                                  JPMORGAN CHASE BANK, TORONTO
                                  BRANCH, as a Canadian Lender

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

                       [SIGNATURE PAGE TO FIRST AMENDMENT
                          TO COMBINED CREDIT AGREEMENTS

                                      S-10<PAGE>

                                                                    EXHIBIT 10.1

                         FIRST AMENDMENT TO AMENDED AND
                            RESTATED CREDIT AGREEMENT

      THIS FIRST AMENDMENT TO CREDIT AGREEMENT (this "First Amendment") dated
effective as of May 26, 2004 (the "First Amendment Effective Date"), among THE
HOUSTON EXPLORATION COMPANY, a Delaware corporation (the "Company"); the lenders
party hereto (the "Lenders"); WACHOVIA BANK, NATIONAL ASSOCIATION, as Issuing
Bank and as Administrative Agent (in its capacity as Administrative Agent, the
"Administrative Agent"); THE BANK OF NOVA SCOTIA and FLEET NATIONAL BANK, as
Co-Syndication Agents; and BNP PARIBAS and COMERICA BANK, as Co-Documentation
Agents.

                                    RECITALS:

      A.    The Company, the Lenders, the Administrative Agent, the
Co-Syndication Agents and the Co-Documentation Agents are parties to that
certain Amended and Restated Credit Agreement dated as of April 1, 2004 (the
"Credit Agreement").

      B.    The parties to the Credit Agreement intend to amend the Credit
Agreement to, among other things, amend Sections 7.07 (Use of Loans), 7.14
(Subsidiaries and Partnerships), 9.05 (Investments), 9.06 (Dividends), 9.07
(Sale of Assets), 9.08 (Stock of Subsidiaries, Etc.), 9.09 (Transactions with
Affiliates) and 9.15 (Sale of Oil and Gas Properties), to permit the KeySpan
Split-Off (as hereinafter defined).

      C.    Therefore, in consideration of the mutual covenants and agreements
herein contained, the parties hereto hereby agree as follows:

      SECTION 1. Defined Terms. Except as amended hereby, terms used herein when
defined in the Credit Agreement shall have the same meanings herein unless the
context otherwise requires.

      SECTION 2. Amendments to Credit Agreement.

            (a)   Definitions. The term "Agreement", defined in Section 1.02 of
the Credit Agreement, is hereby amended in its entirety to read as follows:

                  "Agreement" shall mean this Amended and Restated Credit
            Agreement, as amended by the First Amendment, and as the same may be
            further amended, supplemented, waived or otherwise modified from
            time to time in accordance herewith.

            (b)   New Definitions. Section 1.02 of the Credit Agreement is
hereby further amended by adding thereto the following new definitions in their
appropriate alphabetical order:

<PAGE>

                  "Appalachian Assets" shall mean all of the Company's Oil and
            Gas Properties located in the States of West Virginia, New York and
            Pennsylvania that are owned by Seneca-Upshur at the time of the
            closing of the KeySpan Split-Off.

                  "First Amendment" shall mean that certain First Amendment to
            Amended and Restated Credit Agreement dated effective as of May 26,
            2004 (the "First Amendment Effective Date"), among the Company, the
            Lenders party thereto, the Administrative Agent, the Issuing Bank,
            the Co-Syndication Agents and the Co-Documentation Agents.

                  "KeySpan Split-Off" shall mean the series of transactions
            whereby the Company will:

                        (a)   offer 6,200,000 shares of its common stock to the
            public pursuant to the Offering;

                        (b)   contribute (i) the net proceeds of the Offering,
            (ii) up to an aggregate principal amount not to exceed $150,000,000
            in proceeds of Loans under this Agreement, and (iii) all of the
            Appalachian Assets, to Seneca-Upsur;

                        (c)   transfer all of the issued and outstanding shares
            of the common stock of Seneca-Upsur to KeySpan in exchange for not
            less than 10,800,000 shares of the common stock of the Company owned
            by KeySpan;

                        (d)   retire the shares of its common stock received
            from KeySpan; and

                        (e)   if the underwriters of the Offering exercise their
            option to purchase up to an additional 15% of the Company's common
            stock to cover over-allotments, the net proceeds of such purchase
            will be used to, among other things, acquire and retire up to an
            additional 310,000 shares of the common stock of the Company owned
            by KeySpan.

                  "Offering" shall mean the public offering of common stock of
            the Company scheduled to occur on or about June 2, 2004.

                  "Seneca-Upshur" shall mean Seneca-Upshur Petroleum, Inc., a
            West Virginia corporation, a wholly-owned Subsidiary of the Company.

            (c)   Borrowing Base. Notwithstanding anything to the contrary
contained in the Credit Agreement including, without limitation, the provisions
of Section 2.09 thereof, it is hereby expressly understood and agreed that,
during the period from and after the First Amendment Effective Date until the
next Scheduled Redetermination of the Borrowing Base in accordance with said
Section 2.09, the amount of the Borrowing Base shall be $340,000,000.

                                      -2-
<PAGE>

            (d)   Use of Loans. Section 7.07 of the Credit Agreement is hereby
amended in its entirety to read as follows:

                  "Section 7.07 Use of Loans. The proceeds of the Loans shall be
            used by the Company (i) to pay in full the indebtedness of the
            Company under the Existing Credit Agreement, (ii) to contribute an
            aggregate principal amount not to exceed $150,000,000 to
            Seneca-Upshur in connection with the KeySpan Split-Off, (iii) to
            provide working capital for the Company and its Subsidiaries, and
            (iv) for general corporate purposes, including acquisitions of Oil
            and Gas Properties and related items used or useful in connection
            with the Company's existing business. Neither the Company nor any
            Subsidiary is engaged principally, or as one of its important
            activities, in the business of extending credit for the purpose,
            whether immediate, incidental or ultimate, of buying or carrying
            margin stock (within the meaning of Regulation U or X of the Board
            of Governors of the Federal Reserve System) and no part of the
            proceeds of any Loan hereunder will be used to buy or carry any
            margin stock."

            (e)   Subsidiaries and Partnerships. Section 7.14 of the Credit
Agreement is hereby amended by adding thereto a new sentence, to be the last
full sentence thereof, to read in its entirety as follows:

                  "For purposes of clarification, immediately following the
            exchange of the common stock of Seneca-Upshur for certain shares of
            the common stock of the Company owned by KeySpan in connection with
            the KeySpan Split-Off, the Company will have no Subsidiaries."

            (f)   Investments. Section 9.05 of the Credit Agreement is hereby
amended in its entirety to read as follows:

                  "Section 9.05 Investments. Make, or permit any of its
            Subsidiaries to make, any loan or advance to any Person or purchase
            or otherwise acquire, or permit any such Subsidiary to purchase or
            otherwise acquire, any capital stock, assets, obligations or other
            securities of, make any capital contribution to, or otherwise invest
            in, or acquire any interest in, any Person, except: (a) direct
            obligations of the United States of America or any agency thereof
            with maturities of one year or less from the date of acquisition;
            (b) commercial paper of a domestic issuer rated at least "A-2" by
            Standard & Poor's

                                      -3-
<PAGE>

            Ratings Group, a division of The McGraw-Hill Companies, Inc. or
            "P-2" by Moody's Investors Service, Inc. with maturities of one year
            or less from the date of issuance; (c) certificates of deposit with
            maturities of one year or less from the date of acquisition issued
            by any Lender or any commercial bank operating within the United
            States of America having capital and surplus in excess of
            $50,000,000; (d) short term deposits in money market funds investing
            substantially in investments described in Sections 9.05(a), 9.05(b)
            or 9.05(c) and the fund has an investment grade rating by Standard &
            Poor's Ratings Group, a division of The McGraw-Hill Companies, Inc.
            or Moody's Investors Service, Inc. or is listed on Schedule 9.05 (or
            comparable funds to those listed on Schedule 9.05); (e) for stock,
            obligations or securities received in settlement of debts (created
            in the ordinary course of business) owing to the Company or any such
            Subsidiary; (f) loans and advances to any Guarantor; (g) loans and
            advances to employees in the ordinary course of business not to
            exceed $50,000 in the aggregate at any one time outstanding; (h)
            financing for interests in Properties assigned or conveyed by the
            Company to executives of the Company pursuant to employment
            agreements existing on the date hereof between such executives and
            the Company; (i) the Company's contributions to Seneca-Upshur in
            connection with the KeySpan Split-Off, more particularly described
            in the definition of "KeySpan Split-Off"; and (j) the Company's
            acquisition of the shares of its common stock owned by KeySpan in
            connection with the KeySpan Split-Off."

            (g)   Dividends. Section 9.06 of the Credit Agreement is hereby
amended in its entirety to read as follows:

                  "Section 9.06 Dividends. Declare or pay any dividends,
            purchase, redeem, retire or otherwise acquire for value any of its
            capital stock now or hereafter outstanding, or make any distribution
            of assets to its stockholders as such whether in cash, assets or in
            obligations of the Company, or allocate or otherwise set apart any
            sum for the payment of any dividend or distribution on, or for the
            purchase, redemption or retirement of any shares of its capital
            stock, or make any other distribution by reduction of capital or
            otherwise in respect of any shares of its capital stock or permit
            any of its Subsidiaries to purchase or otherwise acquire for value
            any stock of the Company or another such Subsidiary, except that the
            Company may (a) declare and pay cash dividends equal to 50% of net
            income over the most recent previous four quarters, if, after giving
            effect to such dividend (i) no Event of Default has occurred and is
            continuing, (ii) no Event of Default will be caused by such action,
            (iii) the Borrowing Base Utilization is less than 80%, and (iv) the
            Company has a ratio of Consolidated Funded Debt to Consolidated
            Total Capitalization of less than 55%; and (b) acquire and retire
            the shares of its common stock owned by KeySpan in connection with
            the KeySpan Split-Off."

            (h)   Sale of Assets. Section 9.07 of the Credit Agreement is hereby
amended in its entirety as follows:

                  "Section 9.07 Sale of Assets. Without the prior written
            consent of all of the Lenders, sell, lease, assign, transfer or
            otherwise dispose of, or permit any of its Subsidiaries to sell,
            lease, assign, transfer or otherwise dispose of, any of its now
            owned or hereafter acquired assets (including, without limitation,
            shares of stock and indebtedness of such Subsidiaries, receivables
            and leasehold interests); except: (a) for Oil and Gas Properties

                                      -4-
<PAGE>

            pursuant to Section 9.15, (b) for inventory disposed of in the
            ordinary course of business; (c) the sale or other disposition of
            assets no longer used or useful in the conduct of its business; (d)
            that any such Subsidiary may sell, lease, assign, or otherwise
            transfer its assets to the Company or any other Subsidiary; (e) any
            sale, lease, assignment, transfer or other disposition of Properties
            pursuant to employment agreements with executives of the Company;
            (f) the Company's transfer to Seneca-Upshur of (i) the Appalachian
            Assets, (ii) the net proceeds of the Offering, and (iii) up to an
            aggregate principal amount not to exceed $150,000,000 in Loan
            proceeds, each in connection with the KeySpan Split-Off; and (g) the
            Company's exchange of the common stock of Seneca-Upshur for the
            shares of its common stock owned by KeySpan in connection with the
            KeySpan Split-Off."

            (i)   Stock of Subsidiaries, Etc. Section 9.08 of the Credit
Agreement is hereby amended in its entirety to read as follows:

                  "Section 9.08 Stock of Subsidiaries, Etc. Sell or otherwise
            dispose of any shares of capital stock of any of its Subsidiaries,
            except (a) in connection with a transaction permitted under Section
            9.10, and (b) as contemplated in connection with the KeySpan
            Split-Off; or permit any such Subsidiary to issue any additional
            shares of its capital stock, except (a) directors' qualifying
            shares, and (b) shares of its capital stock issued to the Company or
            another Subsidiary."

            (j)   Transactions with Affiliates. Section 9.09 of the Credit
Agreement is hereby amended as follows:

                  "Section 9.09 Transactions with Affiliates. Enter into any
            transaction, including, without limitation, the purchase, sale or
            exchange of Property or the rendering of any service, with any
            Affiliate or permit any of its Subsidiaries to enter into any
            transaction, including, without limitation, the purchase, sale or
            exchange of property or the rendering of any service, with any
            Affiliate, except (a) in the ordinary course of and pursuant to the
            reasonable requirements of the Company's or such Subsidiary's
            business and upon fair and reasonable terms no less favorable to the
            Company or such Subsidiary than would obtain in a comparable arm's
            length transaction with a Person not an Affiliate, (b) for the sale,
            lease, assignment, transfer or other disposition of Properties
            pursuant to employment agreements existing on the date hereof with
            executives of the Company, and (c) in connection with the KeySpan
            Split-Off."

            (k)   Sale of Oil and Gas Properties. Section 9.15 of the Credit
Agreement is hereby amended in its entirety to read as follows:

                  "Section 9.15. Sale of Oil and Gas Properties. The Company
            will not, nor permit any Subsidiary or Affiliate to sell,

                                      -5-
<PAGE>

            assign, transfer or convey any interest in any Oil and Gas
            Properties, except as follows:

                  (a)   Hydrocarbons sold in the ordinary course of business as
            and when produced;

                  (b)   Routine farm-outs of non-proven acreage;

                  (c)   Sales of Properties, provided the sales of all such
            Properties permitted under this clause since the date of the last
            Scheduled Redetermination of the Borrowing Base do not have a market
            value in excess of $25,000,000 in the aggregate;

                  (d)   In addition to sales permitted above, sales of
            Properties included in the Borrowing Base, provided simultaneously
            with any such sale the Borrowing Base is reduced by amounts agreed
            to at the time by the Required Lenders; and

                  (e)   The transfer of the Appalachian Assets to Seneca-Upshur
            and thereafter the transfer of the common stock of Seneca-Upshur to
            KeySpan, each in connection with the KeySpan Split-Off."

            (l)   Other. The Administrative Agent and the Lenders hereby waive
any Default which may occur under any other term or provision of the Credit
Agreement not amended hereby, solely by reason of the KeySpan Split-Off as
contemplated on the First Amendment Effective Date.

      SECTION 3. Conditions Precedent; Effectiveness. This First Amendment shall
become effective as of the First Amendment Effective Date when the
Administrative Agent shall have received:

                  (i)   Counterparts hereof duly executed by the Company and the
      Required Lenders (or, in the case of any party as to which an executed
      counterpart shall not have been received, telegraphic, telex, or other
      written confirmation from such party of execution of a counterpart hereof
      by such party); and

                  (ii)  The Administrative Agent shall have received such other
      documents as the Administrative Agent or special counsel to the
      Administrative Agent may reasonably request.

      SECTION 4. Reaffirmation of Representations and Warranties. To induce the
Lenders, the Administrative Agent and the Issuing Bank to enter into this First
Amendment, the Company hereby reaffirms, as of the date hereof, its
representations and warranties in their entirety contained in Article VII of the
Credit Agreement, as amended by this First Amendment, and in all other documents
executed pursuant thereto (except to the extent such representations and
warranties relate solely to an earlier date).

                                      -6-
<PAGE>

      SECTION 5. Reaffirmation of Credit Agreement. This First Amendment shall
be deemed to be an amendment to the Credit Agreement, and the Credit Agreement,
as amended hereby, is hereby ratified, approved and confirmed in each and every
respect. All references to the Credit Agreement herein and in any other
document, instrument, agreement or writing shall hereafter be deemed to refer to
the Credit Agreement, as amended hereby.

      SECTION 6. Governing Law; Entire Agreement. This First Amendment shall be
governed by, and construed in accordance with, the laws of the State of Texas.
The Credit Agreement, as amended by this First Amendment, the Notes and the
other Loan Documents constitute the entire understanding among the parties
hereto with respect to the subject matter hereof and supersede any prior
agreements, written or oral, with respect thereto.

      SECTION 7. Severability of Provisions. Any provision in this First
Amendment that is held to be inoperative, unenforceable, or invalid in any
jurisdiction shall, as to that jurisdiction, be inoperative, unenforceable, or
invalid without affecting the remaining provisions in that jurisdiction or the
operation, enforceability, or validity of that provision in any other
jurisdiction, and to this end the provisions of this First Amendment are
declared to be severable.

      SECTION 8. Counterparts. This First Amendment may be executed in any
number of counterparts, all of which taken together shall constitute one
agreement, and any of the parties hereto may execute this First Amendment by
signing any such counterpart.

      SECTION 9. Headings. Article and section headings in this First Amendment
are for convenience of reference only, and shall not govern the interpretation
of any of the provisions of this First Amendment.

      SECTION 10. Successors and Assigns. This First Amendment shall be binding
upon and inure to the benefit of the parties hereto and their respective
successors and assigns.

                         [Signatures begin on next page]

                                      -7-
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this First
Amendment effective as of the First Amendment Effective Date.

      COMPANY:

                              THE HOUSTON EXPLORATION COMPANY

                              By:      /s/ John H. Karnes
                                       ------------------------------
                              Name:    John H. Karnes
                              Title:   Sr. VP and Chief Financial Officer

                              LENDERS AND AGENTS:

                              WACHOVIA BANK, NATIONAL ASSOCIATION,
                              Individually as a Lender, the Issuing Bank and as
                              Administrative Agent

                              By:   /s/ David Humphreys
                                    --------------------------------
                              Name: David Humphreys
                              Title: Director

                              THE BANK OF NOVA SCOTIA, Individually as a
                              Lender and as Co-Syndication Agent

                              By:      /s/ V.H. Gibson
                                       ------------------------------
                              Name:    V.H. Gibson
                              Title:

                              FLEET NATIONAL BANK, Individually as a Lender
                              and as Co-Syndication Agent

                              By:      /s/ Allison I. Rossi
                                       ------------------------------
                              Name:    Allison I. Rossi
                              Title:   Director

                              BNP PARIBAS, Individually as a Lender and as
                              Co-Documentation Agent

                              By:      /s/ Mark A. Cox
                                       ------------------------------
                              Name:    Mark A. Cox
                              Title:   Director

                              By:      /s/ Gabe Ellisor
                                       ------------------------------
                              Name:    Gabe Ellisor
                              Title:   Vice President

                              COMERICA BANK, Individually as a Lender and as
                              Co-Documentation Agent

                              By:      /s/ H. Vadgama
                                       ------------------------------
                              Name:    Huma Vadgama
                              Title:   Assistant Vice President

<PAGE>

                              THE BANK OF NEW YORK

                              By:      /s/ Craig J. Anderson
                                       ------------------------------
                              Name:    Craig J. Anderson
                              Title:   Vice President

                              COMPASS BANK

                              By:      /s/ Patrick McWilliams
                                       ------------------------------
                              Name:    Patrick McWilliams
                              Title:   Assistant Vice President

                              WASHINGTON MUTUAL BANK, FA

                              By:      /s/ Mark Isensee
                                       ------------------------------
                              Name:    Mark Isensee
                              Title:   Vice President

                              UNION BANK OF CALIFORNIA, N.A.

                              By:      /s/ Sean Murphy
                                       ------------------------------
                              Name:    Sean Murphy
                              Title:   Vice President

                              NATEXIS BANQUES POPULAIRES

                              By:      /s/ Donovan C. Broussard
                                       ------------------------------
                              Name:    Donovan C. Broussard
                              Title:   Vice President & Manager

By:                           By:      /s/ Timothy Polvado
                                       ------------------------------
                              Name:    Timothy Polvado
                              Title:   Vice President & Manager

                              WELLS FARGO BANK TEXAS, N.A.

                              By:      /s/ Carlos L. Quinteros
                                       ------------------------------
                              Name:    Carlos L. Quinteros
                              Title:   Relationship Manager

                              SOUTHWEST BANK OF TEXAS, N.A.

                              By:      /s/ W. Bryan Chapman
                                       ------------------------------
                              Name:    W. Bryan Chapman
                              Title:   Senior Vice President Energy Lending

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