NINTH AMENDMENT AGREEMENT


From:  The Chase Manhattan Bank,
       N.A.
       Bangkok Branch
       International Banking
       Facility (the "BANK")
       20 North Sathorn Road
       Silcom, Bangrak, Bangkok
       Thailand

To:    Thai Romo Limited (the
       "BORROWER")
       92/50-51 Sathorn Thani II
       Building
       18th Floor, North Sathorn
       Road
       Kwaeng Silom, Khet Bangrak
       Bangkok, Thailand

To:    Rutherford Moran Oil             Patrick R. Rutherford
       Corporation                      3466 Ella Lee Lane
       5 Greenway Plaza                 Houston, Texas  77027
       Suite 220                        United States of America
       Houston, Texas  77046        
       United States of America     
                                    
       John A. Moran                    Sidney F. Jones, Jr.
       1424 South Ocean Blvd.           P.O. Box 2102
       Palm Beach, Florida  33480       Houston, Texas  77252
       United States of America         United States of America
                                    
       PRRTHAI, INC.                    Red Oak Holdings, Inc.
       THAIPRR, L.P.                    c/o Chase Manhattan
       JAMTHAI, INC.                         Overseas Banking
       THAIJAM, L.P.                         Corporation
       SFJTHAI, INC.                    802 Delaware Avenue
       THAISFJ, L.P.                    Thirteenth Floor
       MDMTHAI, INC.                    Wilmington, Delaware  19801
       SRRTHAI, INC.                    United States of America
       5 Greenway Plaza                 ("RED OAK")
       Suite 220
       Houston, Texas  77046
       United States of America

       (together, the "SPONSORS")

To:    Rutherford Moran Oil             Red Oak Holdings, Inc.
       Corporation                      c/o Chase Manhattan
       PRRTHAI, INC.                         Overseas Banking
       THAIPRR, L.P.                         Corporation
       JAMTHAI, INC.                    802 Delaware Avenue
       THAIJAM, L.P.                    Thirteenth Floor
       SFJTHAI, INC.                    Wilmington, Delaware  19801
       THAISFJ, L.P.                    United States of America
       MDMTHAI, INC.
       SRRTHAI, INC.
       (all of which are at the
       address stated above)

(together the "SHARE PLEDGORS" and, in a separate capacity, the "LOAN NOTE
PLEDGORS")



Gentlemen:

                            PART I -- LOAN AGREEMENT

1.   We refer to the Loan Agreement dated 28th November, 1994 between the
     Borrower and the Bank as amended by letter agreements dated 7th April,
     1995, 31st May, 1995, 14th June, 1995, 30th June, 1995, the two letter
     agreements dated 7th July, 1995 and the letter agreements dated
     20th December, 1995 and 22nd April, 1995 respectively from us to, and
     agreed by, you (as so amended the "LOAN AGREEMENT").

2.   Subject to the condition precedent of the Bank's receipt (or the Bank's
     waiver of receipt) of all the documents set out in Annex I (Conditions
     Precedent) to this Letter, in form and substance satisfactory to the Bank,
     the Bank and the Borrower agree to amend the Loan Agreement with effect on
     and from such date (the "EFFECTIVE DATE") as the Bank and the Borrower
     shall agree in writing to be the Effective Date for the purpose of this
     Letter following the Bank's notifying the Borrower in writing that such
     condition precedent has been satisfied or waived so that it shall be and be
     deemed to be, with effect from the Effective Date, amended in the following
     manner:

     (a)  in Clause 1 (Definitions) the definitions of the term:

          (i)  "FINAL MATURITY DATE" shall be deleted and the following shall be
               inserted in its place:

               ""FINAL MATURITY DATE" means 30th June, 1996;"; and

          (ii) "COMMITMENT" shall be deleted and the following shall be inserted
               in its place:

               ""COMMITMENT" means $47,000,000 to the extent not cancelled,
               reduced or terminated hereunder."

     (b)  in Clause 1 (Definitions) the following shall be inserted in
          alphabetical order:

          ""NINTH AMENDMENT AGREEMENT" means the letter dated on or about
          22nd May, 1996 from the Bank to, and accepted by, the Borrower, the
          Sponsors and the Pledgors;";

     (c)  in Clause 1 (Definitions) the reference definitions in the penultimate
          paragraph before Clause 2 (Facility), the words "and/or" prior to the
          reference to "the Eighth Amendment Agreement shall be replaced by a
          "," and the words "and/or the Ninth Amendment Agreement" shall be
          inserted prior to "(as the case may be)"; and

     (d)  in Clause 3.2(iii) the amount in the third line thereof after the
          words "amount of" shall be deleted and "$7,000,000" shall be inserted
          in its place.

3.   The Bank may waive receipt of the documents referred to in Annex I
     (conditions Precedent) at the sole discretion of the Bank and on such terms
     as the Bank shall see fit.

4.   Prior to the Effective Date, but subject always to paragraph 5 below, the
     Borrower may continue to draw Loans under the Loan Agreement in its
     unamended form provided that such Loans, together with existing outstanding
     Loans, shall not exceed an aggregate amount of US$44,000,000.

5.   If the condition precedent referred to in paragraph 2 above has not been
     satisfied (or waived by the Bank) on or before 29th May, 1996:

     (a)  the Loan Agreement shall not be amended as provided for in paragraph 2
          above; and


                                      -2-


     (b)  the Borrower shall repay all the outstanding Loans on 31st May, 1996
          in accordance with the Loan Agreement (as unamended).

6.   By its countersignature hereto, the Borrower represents and warrants to the
     Bank in the terms of Clause 14 (Representations and Warranties) of the Loan
     Agreement (as though the amendments referred to in paragraph 2 of this
     Letter were effective immediately) and Clause 11 (Representations and
     Warranties of the Borrower) of the Subordination and Sponsor Support
     Agreement, mutatis mutandis, save that references to "this Agreement",
     "herein" and like expressions shall be construed as references to each of:

     (a)  this Letter; and

     (b)  the Loan Agreement as amended by this Letter.

7.   Clause 18.2 (Expenses) of the Loan Agreement shall apply to this Letter,
     mutatis mutandis, and the Borrower will reimburse the Bank, promptly on
     demand, for all charges and reasonable expenses incurred by the Bank in
     connection with the negotiation, preparation and execution of this Letter.

8.   The following Clauses in the Loan Agreement shall apply (as though the
     amendments referred to in paragraph 2 of this Letter were effective
     immediately), mutatis mutandis, to Part I and, insofar as it applies to the
     Borrower, Part IV of this Letter as though references therein to "this
     Agreement", the "Finance Documents", "herein" and like expressions were
     references to this Letter:

     Clause 8.3     (Default Interest)
     Clause 10      (Payments)
     Clause 11      (Taxes)
     Clause 18.3    (Stamp Duties)
     Clause 18.5    (Assignment)
     Clause 18.6    (Set-Off)
     Clause 18.7    (Currency Indemnity)
     Clause 18.8    (Waivers, Remedies Cumulative)
     Clause 19      (Notices)
     Clause 20.2    (Forum).

9.   The Sponsors, the Share Pledgors and the Loan Note Pledgors (in their
     capacity as such) shall have no rights or liabilities under this Part I.

             PART II -- SUBORDINATION AND SPONSOR SUPPORT AGREEMENT

10.  We refer to the Subordination and Sponsor Support Agreement dated
     28th November, 1994 between the Borrower, the Bank and the Sponsors as
     amended by letter agreements dated 7th April, 1995, 7th July, 1995 and
     20th December, 1995 and 22nd April, 1996 from us to, and agreed by you (as
     so amended the "SUBORDINATION AND SPONSOR SUPPORT AGREEMENT").

11.  The Borrower, the Bank and the Sponsors agree to amend further the
     Subordination and Sponsor Support Agreement, with immediate effect, so
     that:

     (a)  in Clause 1.1 (Terms Defined) the definition of the term "SENIOR
          CREDIT AGREEMENT" shall be deleted and the following shall be inserted
          in its place:

          ""SENIOR CREDIT AGREEMENT" means the Loan Agreement dated
          28th November, 1994 between the Borrower and the Bank as amended by
          letter agreements dated 7th April, 1995, 31st May, 1995, 14th June,
          1995, 30th June, 1995, the two letter agreements dated 7th July, 1995,
          the letter agreement dated 20th December, 1995, the letter agreement


                                      -3-


          dated 22nd April, 1996 and the letter agreement dated on or about
          28th May, 1996 respectively from the Bank to, and agreed by, the
          Borrower.";

12.  The Sponsors, by their counter-signatures hereto, consent to the amendments
     made to the Loan Agreement by Part I of this Letter and confirm that the
     Subordination and Sponsor Support Agreement (as amended hereby) shall
     continue to have full force and effect with reference to the Loan Agreement
     (as so amended).

13.  By their countersignatures hereto, the Sponsors represent and warrant to
     the Bank in the terms of Clause 12 (Representations and Warranties of the
     Sponsors) of the Subordination and Sponsor Support Agreement (as though the
     amendments referred to in paragraph 11 of this Letter were effective
     immediately), mutatis mutandis, save that references to "this Agreement",
     "herein" and like expressions shall be construed as references to each of:

     (a)  this Letter; and

     (b)  the Subordination and Sponsor Support Agreement (as amended hereby).

14.  The following Clauses of the Subordination and Sponsor Support Agreement
     (as though the amendments referred to in paragraph 11 of this Letter were
     effective immediately) shall apply, mutatis mutandis, to Part II and,
     insofar as it applies to the Sponsors or the Subordination and Sponsor
     Support Agreement, Part V of this Letter as though references therein to
     "this Agreement" and "herein" and like expressions were references to this
     Letter (or, in the case of Clause 21.1 (Rights of the Borrower), to this
     Part II only of this Letter):

     Clause 21 (General)
     Clause 22 (Sponsor's obligations joint and several)
     Clause 23 (Notices)
     Clause 24 (Jurisdiction).

15.  The Share Pledgors and the Loan Note Pledgors (in their capacity as such)
     shall have no rights or liabilities under this Part II.

          PART III -- SHARE PLEDGE AGREEMENT AND SHAREHOLDERS' CONSENT

16.  We refer to:

     (a)  the Share Pledge Agreement dated 13th July, 1995 between the Share
          Pledgors and the Bank as pledgee (the "SHARE PLEDGE AGREEMENT"); and

     (b)  the Shareholders' Consent letter dated 13th July, 1995 from the Share
          Pledgors to the Bank in connection with the Loan Agreement and the
          Subordination and Sponsor Support Agreement (the "SHAREHOLDERS'
          CONSENT").

17.  The Share Pledgors, by their counter-signatures hereto, consent to the
     amendments made to the Loan Agreement by Part 1 of this Letter and confirm
     that the Share Pledge Agreement and the Shareholders' Consent, each as
     amended pursuant to Clause 17 above, shall continue to have full force and
     effect with reference to the Loan Agreement (as so amended).

18.  The Borrower, the Sponsors and the Loan Note Pledgors (in their capacity as
     such) shall have no rights or liabilities under this Part III.


                                      -4-


              PART IV -- PLEDGE OF SHAREHOLDER LOAN NOTES AGREEMENT

19.  We refer to:

     (a)  the Pledge of Shareholder Loan Notes Agreement (the "MASTER PLEDGE
          AGREEMENT") dated 13th July, 1995 between the Bank and the Loan Note
          Pledgors; and

     (b)  the individual loan note pledges (the "INDIVIDUAL PLEDGES") dated
          13th July, 1995 entered into by each Loan Note Pledgor in connection
          with the Master Pledge Agreement.

20.  The Loan Note Pledgors, by their counter-signature hereto, confirm that the
     Master Pledge Agreement and the Individual Pledges shall continue to have
     full force and effect with reference to the Loan Agreement (as so amended).

21.  The Borrower, the Sponsors and the Share Pledgors (in their capacity as
     such) shall have no rights or liabilities under this Part IV.

                                PART V -- GENERAL

22.  Terms defined in the Loan Agreement (as though the amendments referred to
     in paragraph 2 of this Letter were effective immediately) shall, when used
     in this Letter, bear the same meaning in this Letter as in the Loan
     Agreement.

23.  This Letter shall be governed by and construed in accordance with the Laws
     of England apart from paragraphs 17 and 20 which shall be governed by and
     construed in accordance with the laws of Thailand.

Yours faithfully,




Dated:                May 29, 1996


      /s/ Tim Chapman
- -------------------------------
For and on behalf of
The Chase Manhattan Bank, N.A.
Bangkok Branch
Bangkok International Banking
Facility

BORROWER

We hereby agree to the above.

Dated:                May 28, 1996


     /s/ Michael D. McCoy
- -------------------------------
For and on behalf of
Thai Romo Limited


                                      -5-


SPONSORS

We hereby agree to the above.

Dated:               May 28, 1996


       /s/ Pat Rutherford                      /s/ Patrick Rutherford
- -----------------------------------     -------------------------------------
For and on behalf of                    Patrick R. Rutherford
Rutherford Moran Oil
Corporation


      /s/ John A. Moran                       /s/ Sidney F. Jones, Jr.
- -----------------------------------     -------------------------------------
John A. Moran                           Sidney F. Jones, Jr.


      /s/ Pat Rutherford                         /s/ Pat Rutherford
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
PRRTHAI, INC.                           THAIPRR, L.P.


      /s/ John A. Moran                          /s/ John A. Moran
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
JAMTHAI, INC.                           THAIJAM, L.P.


    /s/ Sidney F. Jones, Jr.                  /s/ Sidney F. Jones, Jr.
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
SFJTHAI, INC.                           THAISFJ, L.P.


    /s/ Michael D. McCoy
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
MDMTHAI, INC.                           SRRTHAI, L.P.



- -----------------------------------
For and on behalf of
RED OAK HOLDINGS, INC.


                                      -6-


SHARE PLEDGORS

We hereby agree to the above.

Dated:              May 28, 1996


      /s/ Pat Rutherford
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
Rutherford Moran Oil                    Red Oak Holdings, Inc.
Corporation


      /s/ Pat Rutherford                        /s/ Pat Rutherford
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
PRRTHAI, INC.                           THAIPRR, L.P.


        /s/ John A. Moran                       /s/ John A. Moran
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
JAMTHAI, INC.                           THAIJAM, L.P.


    /s/ Sidney F. Jones, Jr.                 /s/ Sidney F. Jones, Jr.
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
SFJTHAI, INC.                           THAISFJ, L.P.


     /s/ Michael D. McCoy
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
MDMTHAI, INC.                           SRRTHAI, INC.


                                      -7-



LOAN NOTE PLEDGORS

We hereby agree to the above.

Dated: May 28, 1996


      /s/ Pat Rutherford  
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
Rutherford Moran Oil                    Red Oak Holdings, Inc.
Corporation


      /s/ Pat Rutherford                         /s/ Pat Rutherford  
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
PRRTHAI, INC.                           THAIPRR, L.P.


      /s/ John A. Moran                        /s/ John A. Moran
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
JAMTHAI, INC.                           THAIJAM, L.P.


     /s/ Sidney F. Jones, Jr.                 /s/ Sidney F. Jones, Jr.
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
SFJTHAI, INC.                           THAISFJ, L.P.


    /s/ Michael D. McCoy                      /s/ Susan R. Rutherford
- -----------------------------------     -------------------------------------
For and on behalf of                    For and on behalf of
MDMTHAI, INC.                           SRRTHAI, L.P.


                                      -8-


                                     ANNEX I

                              CONDITIONS PRECEDENT

1.   A copy of the constitutional documents currently in force of the Borrower
     if amended since they were delivered to the Bank in connection with the
     Loan Agreement or, if not amended, a certificate to that effect from an
     officer of the Borrower.

2.   A copy of all corporate authorisations and resolutions required for the
     execution, delivery and performance of this Letter by the Borrower and
     authorising a specified person or persons to execute this Letter on behalf
     of the Borrower.

3.   A copy of the constitutional documents currently in force of each Share
     Pledgor if amended since they were delivered to the Bank in connection with
     the Sixth Amendment Agreement or, if not amended, a certificate to that
     effect from an officer of the relevant company.

4.   A copy of all corporate authorisations and resolutions required for the
     execution, delivery, and performance of this Letter by each (corporate)
     Sponsor, each Share Pledgor and each Loan Note Pledgor and authorising a
     specified person or persons to execute this Letter on behalf of the
     respective party.

5.   A copy of all other resolutions, authorisations, approvals, consents,
     licences, exemptions, filings and registrations necessary or desirable in
     connection with the execution, delivery, performance, validity and
     enforceability of the Documents (and the Finance Documents as amended
     thereby).

6.   A copy of the Joint Operating Agreement if amended since it was last
     delivered to the Bank in connection with the Loan Agreement or, if not
     amended, a certificate to that effect from an officer of the Borrower.

7.   A copy of the Concession Agreement if amended since it was last delivered
     to the Bank in connection with the Loan Agreement or, if not amended, a
     certificate to that effect from an officer of the Borrower.

8.   A copy of all documents of title pursuant to which the Borrower acquired a
     14.67480 per cent interest in the Tantawan Area from Maersk Oil (Thailand)
     Ltd if amended since they were last delivered to the Bank in connection
     with the First Amendment Agreement or, if not amended, a certificate to
     that effect from an officer of the Borrower and a copy of all other Maersk
     Transfer Documents.

9.   A copy of the Management Services Agreement if amended since it was last
     delivered to the Bank in connection with the Loan Agreement, or if not
     amended, a certificate to that effect from an officer of the Borrower.

10.  This Letter duly countersigned by each of the Borrower, the Sponsors, the
     Share Pledgors and the Loan Note Pledgors.

Each copy document specified above shall be certified by a duly authorised
officer of the Borrower as being correct, complete and in full force and effect
as at a date no earlier than the date of this Letter.  Where a duly authorised
officer of the Borrower is required to give certificates in respect of any of
the above items, the Bank will accept one global certificate in lieu of
individual certificates.


                                      -9-


                                    SCHEDULE

A. LOAN AGREEMENT

1. Borrower:                Thai Romo Limited

2. Facility Amount:         US $47,000,000

3. Loan Agreement Date:     28th November, 1994 (the date of the Loan Agreement
                            as amended by):

                            (a)  Letter Agreements dated 7th April, 1995,
                                 31st May, 1995, 14th June, 1995, 30th June,
                                 1995 and 7th July, 1995 between the Bank, the
                                 Borrower, the Sponsors, amongst others;

                            (b)  amendment agreements dated 29th December,
                                 1995, 22nd April, 1996 and on or about
                                 29th May, 1996 between, amongst others, the
                                 Borrower, the Bank and the Participant;

B. PARTICIPATION

1. Participated Facility:   $47,000,000

2. Participated Amount:     $22,000,000 (payable in Baht as provided for
                            herein)

3. Participant's Percentage:

   (a)                      in the event that the total amount of Loans
                            disbursed and outstanding on a given date (taking
                            account of Loans to be disbursed on any Drawdown
                            Date (as defined in Clause 2.3) (the "DISBURSED
                            LOANS")) is less than or equal to $44,000,000,
                            fifty per cent (50%); or otherwise

   (b)                      22,000,000/y %

      where y equals the Disbursed Loans, but provided that Participant's
      participation in the Disbursed Loans shall not exceed $22,000,000.

4. Commencement Date:       29th December, 1995

5. Advances outstanding under the Participated Facility on the Commencement
   Date:

   Description              Applicable Payment Clause

   $21,000,000              2.1

6. Participant's Margin for Interest:4%

7. Fees to which the Participation Agreement applies:

   0.25% of $22,000,000, such amount having been paid shortly after the
   Commencement Date

C. ACCOUNTS

1. Bank's Account(s):       The Chase Manhattan Bank, N.A., New York account
                            The Chase Manhattan Bank, N.A., Bangkok Branch
                            Account No. 001-0-954006


                                      -10-



2. Participant's Account(s):

   Participant's Baht Account:   Account No. 658-0-11553-0 with The Chase
                                 Manhattan Bank, N.A., Bangkok Branch










                                      -11-