Document:

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                                                                   EXHIBIT 10.14

                       FIRST AMENDMENT TO CREDIT AGREEMENT

         THIS FIRST AMENDMENT TO CREDIT AGREEMENT is dated and effective as of
December 31, 2000 (the "First Amendment"), among PETROQUEST ENERGY, L.L.C., a
Louisiana limited liability company and the successor by merger to PetroQuest
Energy, Inc., a Louisiana corporation, and the successor by name change to
PetroQuest Energy One, L.L.C. (herein called the "LLC"), PETROQUEST ENERGY,
INC., a Delaware corporation (herein called the "Guarantor"), and HIBERNIA
NATIONAL BANK, a national banking association (herein called the "Bank").

                                R E C I T A L S:

         1. PetroQuest Energy, Inc., a Louisiana corporation ("PE-LA."),
PetroQuest Energy One, L.L.C., a Louisiana limited liability company ("PEO"),
the Guarantor and the Bank have heretofore entered into that certain Credit
Agreement dated December 21, 2000 (the "Credit Agreement"), pursuant to which
the Bank established in favor of PEO and PE-LA., as in solido co- borrowers, a
revolving line of credit.

         2. Effective December 31, 2000, PE-LA. merged into PEO, with PEO as the
surviving entity, and PEO then changed its name to PetroQuest Energy, L.L.C. As
a result of the merger, the Guarantor now owns one hundred percent (100%) of the
membership interest in the LLC.

         3. The purpose of this First Amendment is to evidence that the Borrower
under the Credit Agreement is now the LLC, and to address certain other matters
necessitated by the foregoing merger and name change

         4. Capitalized terms used herein which are defined or used in the
Credit Agreement are used herein with such meanings, except as may be otherwise
expressly provided in this First Amendment.

         NOW, THEREFORE, THE PARTIES HERETO, IN CONSIDERATION OF THE MUTUAL
COVENANTS HEREINAFTER SET FORTH AND INTENDING TO BE LEGALLY BOUND HEREBY, AGREE
AS FOLLOWS:

         A.       AMENDMENTS TO DEFINITIONS.

                  (1). The following definition in Section 1.1 of the Agreement
are hereby restated as follows:

                  "BORROWER" shall mean PetroQuest Energy, L.L.C., a Louisiana
                  limited liability company and the successor by merger to
                  PetroQuest Energy, Inc., a Louisiana corporation and the
                  successor by name change to PetroQuest Energy One, L.L.C., a
                  Louisiana limited liability company, together with its
                  successors and assigns.

               First Amendment to Credit Agreement -- Page 1 of 7

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                  (2). The following new definitions are hereby added to the
                  Agreement:

                  "CREDIT AGREEMENT" shall mean the Agreement.

                  "FIRST AMENDMENT" shall mean that certain First Amendment to
                  Credit Agreement dated December 31, 2000, among the LLC, the
                  Guarantor, and the Bank.

                  "LIABILITIES" shall mean, as to any Person, all indebtedness,
                  liabilities and obligations of such Person, whether matured or
                  unmatured, liquidated or unliquidated, primary or secondary,
                  direct or indirect, absolute, fixed or contingent, and whether
                  or not required to be considered pursuant to GAAP.

                  "LLC" shall have the same meaning as the word "Borrower."

                  "MERGER" shall mean the merger of PE-LA. into PEO and the
                  change of name by PEO to the LLC, all effective as of December
                  31, 2000.

                  "NON-RECOURSE INDEBTEDNESS" shall mean Obligations of an
                  Unrestricted Subsidiary which is not a Liability, in whole or
                  part, of any Restricted Person and which is not secured by any
                  Encumbrance upon any property or assets of any Restricted
                  Person, provided that no such Obligations of an Unrestricted
                  Subsidiary shall be considered "Non-Recourse Indebtedness" if
                  any default with respect to such Obligations would allow or
                  require any Obligations which is owed by one or more of the
                  Restricted Persons to be accelerated or otherwise made payable
                  in advance of its stated maturity.

                  "OBLIGATIONS" of any Person means Liabilities in any of the
                  following categories: (a) Liabilities for borrowed money; (b)
                  Liabilities constituting an obligation to pay the deferred
                  purchase price of property or services; (c) Liabilities
                  evidenced by a bond, debenture, note or similar instrument;
                  (d) Liabilities which (i) would under GAAP be shown on such
                  Person's balance sheet as a liability, and (ii) are payable
                  more than one year from the date of creation thereof (other
                  than reserves for taxes and reserves for contingent
                  obligations); (e) Liabilities arising under Hedging
                  Agreements; (f) Liabilities constituting principal under
                  leases capitalized in accordance with GAAP, (g) Liabilities
                  arising under conditional sales or other title retention
                  agreements; (h) Liabilities owing under direct to indirect
                  guaranties of Obligations of any other Person or otherwise
                  constituting obligations to purchase or acquire or to
                  otherwise protect or insure a creditor against loss in respect
                  of Obligations of any other Person (such as obligations under
                  working capital maintenance agreements, agreements to
                  keep-well, or agreements to purchase Obligations, assets,
                  goods, securities or services), but excluding endorsements in
                  the ordinary course of business of negotiable instruments in
                  the course of collection; (i) Liabilities (for example,
                  repurchase agreements and sale/leaseback agreements)
                  consisting of an obligation to purchase or lease securities or
                  other property, if such Liabilities arises out of or in
                  connection with

               First Amendment to Credit Agreement -- Page 2 of 7

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                  the sale of the same or similar securities or property;
                  (j) Liabilities with respect to letters of credit or
                  applications or reimbursement agreements therefor; (k)
                  Liabilities with respect to payments received in consideration
                  of oil, gas or other minerals yet to be acquired or produced
                  at the time of payment (including obligations under
                  "take-or-pay" contracts to deliver gas in return for payments
                  already received and the undischarged balance of any
                  production payment created by such Person or for the creation
                  of which such Person directly or indirectly received payment);
                  or (l) Liabilities with respect to other obligations to
                  deliver goods or services in consideration of advance payments
                  therefor; provided, however, that the "Obligations" of any
                  Person shall not include Liabilities that were incurred by
                  such Person on ordinary trade terms to vendors, suppliers, or
                  other Persons providing goods and services for use by such
                  Person in the ordinary course of its business, unless and
                  until such Liabilities are outstanding more than 120 days past
                  original invoice or billing date therefor.

                  "PETROQUEST OIL & GAS" shall mean PetroQuest Oil & Gas,
                  L.L.C., a Louisiana limited liability company the sole member
                  of which is the Guarantor.

                  "RESTRICTED PERSON" means the Guarantor, the Borrower, and
                  each other Subsidiary of the Guarantor.

                  "UNRESTRICTED SUBSIDIARY" means (a) any Subsidiary of
                  Guarantor designated an Unrestricted Subsidiary of Guarantor
                  by Guarantor's Board of Directors in compliance with the
                  following sentence, and (b) any Subsidiary of an Unrestricted
                  Subsidiary. The Board of Directors of Guarantor may at any
                  time and from time to time designate any Subsidiary of
                  Guarantor (other than Borrower or any Subsidiary of Borrower)
                  as an Unrestricted Subsidiary provided that (i) no Default or
                  Event of Default has occurred or is continuing at the time of
                  such designation and after giving effect to such designation,
                  (ii) immediately after such designation, no Restricted Person
                  has any Liability to pay any Obligations of such Subsidiary,
                  has in any way guaranteed any Obligations of such Subsidiary,
                  or has any assets or properties which are subject to any
                  Encumbrance securing any Obligations of such Subsidiary, and
                  (iii) notice of any such designation is promptly given to Bank
                  in writing.

         B.       AMENDMENT TO AFFIRMATIVE COVENANTS.

                  (1). The affirmative covenants contained in Sections 11.1.,
11.2., 11.3., 11.4., 11.5., 11.6., 11.7., 11.8., 11.9., 11.10., 11.11., 11.13.,
11.14., 11.16., and 11.22. shall apply to the Borrower and the Guarantor.

                  (2). The following new affirmative covenant is hereby added to
the Agreement as Section 11.21.:

                  SECTION 11.21. PETROQUEST OIL & GAS. The Guarantor shall cause
                  the assets of PetroQuest Oil & Gas at all times to consist
                  solely of beneficial interests in oil

               First Amendment to Credit Agreement -- Page 3 of 7

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                  and gas properties, the legal interests of which is owned by
                  Persons other than the Borrower and/or the Guarantor. The
                  Guarantor further agrees to remain the sole member of
                  PetroQuest Oil & Gas.

                  (3). The following new affirmative covenant is hereby added to
the Agreement as Section 11.22.

                  SECTION 11.22. UNRESTRICTED SUBSIDIARIES Guarantor and
                  Borrower will insure that each Unrestricted Subsidiary
                  complies with each indenture, mortgage, deed of trust,
                  security agreement, lease, franchise, agreement, contract or
                  other instrument or obligation to which such Unrestricted
                  Subsidiary is a party or by which it or any of its properties
                  is bound, and with all laws, regulations, and orders
                  applicable to such Unrestricted Subsidiary or its properties,
                  business and affairs, including Environmental Laws, if such
                  Unrestricted Subsidiary's failure so to comply would impose
                  any Liability on any Restricted Person, require any Restricted
                  Person to pay or perform any Liability owing by any
                  Unrestricted Subsidiary, or could otherwise cause a Material
                  Adverse Change. The Guarantor and the Borrower will insure
                  that no Unrestricted Subsidiary takes, or omits to take, any
                  action if such action or omission would cause the Guarantor or
                  the Borrower to be unable to remake its representations and
                  warranties hereunder.

         C.       AMENDMENTS TO NEGATIVE COVENANTS.

                  (1). The negative covenants contained in Sections 12.1.,
12.2., 12.6., 12.7., 12.8., and 12.11. shall apply to both the Borrower and the
Guarantor.

                  (2). Section 12.4 (f) of the Agreement is hereby deleted.

                  (3). Section 12.5 (c) of the Agreement is hereby deleted.

                  (4). The following new negative covenant is hereby added to
the Agreement as Section 12.11.:

                  SECTION 12.11. NON-RECOURSE INDEBTEDNESS. The Borrower and the
                  Guarantor agree and covenant that no Unrestricted Subsidiary
                  shall create, incur, assume, or otherwise become liable with
                  respect to any Obligations other than Non-Recourse
                  Indebtedness and no Unrestricted Subsidiary shall have
                  Non-Recourse Indebtedness in excess of $25,000,000 at any one
                  time outstanding.

                  (5). Section 12.6 of the Agreement is hereby amended and
supplemented to include the following new provision as subpart (c) thereof:

                  (c) Loans by Borrower to Guarantor and loans by Guarantor to
                  Borrower and/or any Subsidiary of Guarantor that is a
                  guarantor of the Indebtedness, and capital contributions, and
                  investments in the Borrower or any Subsidiary of Guarantor
                  that is a guarantor of the Indebtedness.

               First Amendment to Credit Agreement -- Page 4 of 7

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         D. ASSUMPTION. Subject to the terms and conditions of the Agreement, as
amended by the First Amendment, the LLC does hereby unconditionally assume all
obligations, duties and responsibilities of the Borrower under the Agreement,
the Revolving Note, the Mortgage, the Loans, and all Related Documents to which
PE-LA. and/or PEO was a party. Further, as a result of the Merger, the LLC
hereby acknowledges and confirms that it is now the sole Borrower under the
Revolving Note.

         E. CONFIRMATION OF COLLATERAL DOCUMENTS. It is the intention of the
parties that all of the liens, privileges, priorities, and equities existing and
to exist under and in accordance with the terms of the Loan Documents are hereby
renewed, extended, and carried forward as security for the Loans. Further, the
parties agree and acknowledge that the Guaranty shall continue to secure the
payment of the indebtedness of the LLC to the Bank, including the indebtedness
of the LLC under the Revolving Note. The LLC and the Guarantor agree to execute
and deliver to the Bank, promptly upon the request of the Bank or its counsel,
all supplements, amendments, and/or restatements to the Collateral Documents
that are deemed necessary by the Bank to evidence the Merger and/or the fact
that the LLC is the successor to PEO and PE-LA.

         F. NO DEFAULT REPRESENTATION. On and as of the date hereof, and after
giving effect to this First Amendment, the LLC and the Guarantor reaffirm and
restate the representations and warranties set forth in the Agreement and the
Loan Documents. Further, the LLC and the Guarantor also represent and warrant
that as the date hereof and after giving effect to this First Amendment, no
uncured or unwaived Default has occurred and is continuing under the Agreement,
as amended by this First Amendment.

         G. CONDITIONS PRECEDENT. The obligation of the Bank to make the Loans
remains subject to the conditions precedent set forth in the Agreement and the
following conditions precedent: The Bank's receipt of (i) this First Amendment
executed by the LLC and the Guarantor; (ii) certified resolutions by the
Guarantor (on behalf of itself and as the sole member of the LLC), in for and
substance satisfactory to the Bank; (iii) the executed documents evidencing the
Merger and the filing thereof with the Louisiana Secretary of State and in all
records necessary to effect a transfer of the Mortgaged Properties to the LLC;
and (iv) all amendments, supplements, and/or restatements pertaining to the
Collateral Documents that may be required by the Bank or its counsel as a result
of the Merger.

         H. WAIVER OF DEFENSES. In consideration of the Bank's execution of this
First Amendment, the LLC and the Guarantor do hereby irrevocably waive any and
all claims and/or defenses to payment on any indebtedness owed by any of them to
the Bank that may exist as of the date of execution of this First Amendment.

         I. AMENDMENTS. THE CREDIT AGREEMENT AND THIS FIRST AMENDMENT ARE CREDIT
OR CREDIT AGREEMENTS AS DESCRIBED IN LA. R.S. 6:SS.1121, ET SEQ. THERE ARE NO
ORAL AGREEMENTS BETWEEN THE BANK, THE LLC, AND THE GUARANTOR. THE CREDIT
AGREEMENT, AS AMENDED BY THIS FIRST AMENDMENT, SETS FORTH THE ENTIRE AGREEMENT
OF THE PARTIES WITH RESPECT TO THE SUBJECT MATTER

               First Amendment to Credit Agreement -- Page 5 of 7

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HEREOF AND SUPERSEDES ALL PRIOR WRITTEN AND ORAL UNDERSTANDINGS BETWEEN THE
BANK, THE LLC, AND THE GUARANTOR WITH RESPECT TO THE MATTERS HEREIN SET FORTH.
THE CREDIT AGREEMENT, AS AMENDED BY THIS FIRST AMENDMENT, MAY NOT BE MODIFIED OR
AMENDED EXCEPT BY A WRITING SIGNED AND DELIVERED BY THE LLC, THE GUARANTOR AND
THE BANK.

         J. GOVERNING LAW: COUNTERPARTS. This First Amendment shall be governed
by and construed in accordance with the laws of the State of Louisiana. This
First Amendment may be executed in any number of counterparts, all of which
counterparts, when taken together, shall constitute one and the same document.

         K. CONTINUED EFFECT. Except as expressly modified herein, the Credit
Agreement as amended by this First Amendment, shall continue in full force and
effect. The Credit Agreement, as amended by this First Amendment, is hereby
ratified and confirmed by the parties hereto.

              (THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK)

               First Amendment to Credit Agreement -- Page 6 of 7

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         IN WITNESS WHEREOF, the parties hereto have caused this First Amendment
to be executed and delivered as of the date hereinabove provided by the
authorized officers each hereunto duly authorized.

                                 PETROQUEST ENERGY, L.L.C.

                                 A LOUISIANA LIMITED LIABILITY COMPANY

                                 BY PETROQUEST ENERGY, INC., A DELAWARE

                                 CORPORATION, AS SOLE MEMBER

                                 BY:    /s/ CHARLES T. GOODSON
                                     ---------------------------
                                 NAME:  Charles T. Goodson
                                       -------------------------
                                 TITLE: Chairman Of The Board &
                                        ------------------------
                                        Chief Executive Officer
                                        ------------------------

                                 PETROQUEST ENERGY, INC.

                                 A DELAWARE CORPORATION

                                 BY:    /s/ CHARLES T. GOODSON
                                     ---------------------------
                                 NAME:  Charles T. Goodson
                                       -------------------------
                                 TITLE: Chairman Of The Board &
                                        ------------------------
                                        Chief Executive Officer
                                        ------------------------

                                 HIBERNIA NATIONAL BANK

                                 BY:    /s/ DAVID R. REID
                                     ---------------------------
                                 NAME:  David R. Reid
                                       -------------------------
                                 TITLE: Senior Vice President
                                        ------------------------

               First Amendment to Credit Agreement -- Page 7 of 7<PAGE>   1
                                                                   EXHIBIT 10.16

                      FIRST AMENDMENT TO CREDIT AGREEMENT

         THIS FIRST AMENDMENT TO CREDIT AGREEMENT (herein called this
"Amendment") is made as of the 31st day of December, 2000, by and between
PetroQuest Energy, L.L.C., a Louisiana limited liability company formerly known
as PetroQuest Energy One, L.L.C. (the "LLC"), PetroQuest Energy, Inc., a
Delaware corporation ("Parent"), and EnCap Energy Capital Fund III, L.P.
("Lender").

                              W I T N E S S E T H:

         WHEREAS, the LLC, PetroQuest Energy, Inc., a Louisiana corporation (the
"Corporation"), Parent, and Lender have entered into that certain Credit
Agreement dated as of December 21, 2000 (as amended, supplemented, or restated
to the date hereof, the "Original Agreement"); and

         WHEREAS, on the date hereof but prior to the execution of this
Amendment, the Corporation merged with and into the LLC with the LLC being the
surviving entity (the "Merger"); and

         WHEREAS, subsequent to the Merger but prior to the execution of this
Amendment, the LLC changed its name to "PetroQuest Energy, L.L.C." from
"PetroQuest Energy One, L.L.C."; and

         WHEREAS, prior to the Merger the Corporation was the sole member of the
LLC but after giving effect to the Merger Parent is the sole member of the LLC;
and

         WHEREAS, each of Parent and the LLC has requested Lender to amend the
Original Agreement as provided herein;

         NOW, THEREFORE, in consideration of the premises and the mutual
covenants and agreements contained herein and in the Original Agreement, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto do hereby agree as follows:

                                   ARTICLE I.

                           Definitions and References

         Section 1.1 Terms Defined in the Original Agreement. Unless the context
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

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         Section 1.2. Other Defined Terms. Unless the context otherwise
requires, the following terms when used in this Amendment shall have the
meanings assigned to them in this Section 1.2.

                  "Amendment" means this First Amendment to Credit Agreement.

                  "Credit Agreement" means the Original Agreement as amended by
         this Amendment.

                                  ARTICLE II.

                                   Amendments

         Section 2.1. Defined Terms.

         (a) The following defined terms are hereby added to Section 1.1 of the
Original Agreement in proper alphabetical order:

                  "Non-Recourse Indebtedness" means Indebtedness of an
         Unrestricted Subsidiary which is not a Liability, in whole or part, of
         any Restricted Person and which is not secured by any Lien upon any
         property or assets of any Restricted Person, provided that no such
         Indebtedness of an Unrestricted Subsidiary shall be considered
         "Non-Recourse Indebtedness" if any default with respect to such
         Indebtedness would allow or require any Indebtedness which is owed by
         one or more of the Restricted Persons to be accelerated or otherwise
         made payable in advance of its stated maturity.

                  "PetroQuest Oil & Gas" means PetroQuest Oil & Gas, L.L.C., a
         Louisiana limited liability company the sole member of which is Parent.

                  "Unrestricted Subsidiary" means (a) any Subsidiary of Parent
         which is hereafter designated an Unrestricted Subsidiary of Parent by
         Parent's Board of Directors in compliance with the following sentence,
         and (b) any Subsidiary of an Unrestricted Subsidiary. The Board of
         Directors of Parent may at any time and from time to time designate any
         Subsidiary of Parent (other than Borrower or any Subsidiary of
         Borrower) as an Unrestricted Subsidiary provided that (i) no Default or
         Event of Default has occurred or is continuing at the time of such
         designation and after giving effect to such designation, (ii)
         immediately after such designation, no Restricted Person has any
         Liability to pay any Indebtedness of such Subsidiary, has in any way
         guaranteed any Indebtedness of such Subsidiary, or has any assets or
         properties which are subject to any Lien securing any Indebtedness of
         such Subsidiary, and (iii) notice of any such designation is promptly
         given to Lender in writing.

         (b) The following defined terms contained in Section 1.1. of the
Original Agreement are hereby amended in the entirety as follows:

                  "Borrower" means, collectively, the Corporation and the LLC,
         provided, however that from and after the Borrower Merger "Borrower"
         shall mean the LLC.

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<PAGE>   3

                  "LLC" means PetroQuest Energy, L.L.C., a Louisiana limited
         liability company formerly known as PetroQuest Energy One, L.L.C. and
         successor in interest by merger to PetroQuest Energy, Inc., a Louisiana
         corporation.

                  "Restricted Person" means each Guarantor, the Corporation, the
         LLC, and each other Subsidiary of Parent other than an Unrestricted
         Subsidiary, provided, however, that for purposes of Article V and
         Article VI (but not Sections 6.13, 6.14, 6.15, and 6.19) each
         Unrestricted Subsidiary shall be deemed to be a Restricted Person.

         Section 2.2. PetroQuest Oil & Gas. The following section is hereby
added to Article V of the Original Agreement:

                  "Section 5.17. PetroQuest Oil & Gas. The assets of PetroQuest
         Oil & Gas consist solely of beneficial interests in oil and gas
         properties, the legal interest of which is owned by Persons other than
         Restricted Persons. Parent is the sole member of PetroQuest Oil & Gas."

         Section 2.3. Guaranties of Subsidiaries. The parenthetical clause in
Section 6.13 of the Original Agreement that reads "(other than the Corporation
or the LLC)" is hereby amended to read in its entirety as follows:

         "(other than the Corporation, the LLC, or PetroQuest Oil & Gas)"

         Section 2.4. Perfection and Protection of Security Interests and Liens.
Section 6.14 of the Original Agreement is hereby amended in its entirety to read
as follows:

                  "Section 6.14. Perfection and Protection of Security Interests
         and Liens. Parent and Borrower will from time to time deliver, and will
         cause any other Restricted Person (other than PetroQuest Oil & Gas) to
         deliver to Lender any financing statements, continuation statements,
         extension agreements and other documents, properly completed and
         executed (and acknowledged when required) by such Restricted Persons in
         form and substance satisfactory to Lender, which Lender requests for
         the purpose of perfecting, confirming, or protecting any Liens or other
         rights in Collateral securing any Obligations."

         Section 2.5. Agreement to Deliver Security Documents. Section 6.15 of
the Original Agreement is hereby amended in its entirety to read as follows:

                  "Section 6.15. Agreement to Deliver Security Documents. Parent
         and Borrower agree to deliver and to cause each other Restricted Person
         (other than PetroQuest Oil & Gas) to deliver, to further secure the
         Obligations whenever requested by Lender in its sole and absolute
         discretion, deeds of trust, mortgages, chattel mortgages, security
         agreements, financing statements and other Security Documents in form
         and substance satisfactory to Lender for the purpose of granting,
         confirming, and perfecting second and prior liens or security interests
         in any oil and gas properties and interests, together with all
         associated equipment, production, production proceeds and other real or
         personal property, hereafter owned or acquired by any such Restricted
         Person. Parent and Borrower also agree to

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<PAGE>   4

         deliver, whenever requested by Lender in its sole and absolute
         discretion, favorable title opinions from legal counsel acceptable to
         Lender with respect to any such Restricted Person's properties and
         interests designated by Lender, based upon abstract or record
         examinations to dates acceptable to Lender and (a) stating that such
         Restricted Person has good and defensible title to such properties and
         interests, free and clear of all Liens other than Permitted Liens, (b)
         confirming that such properties and interests are subject to Security
         Documents securing the Obligations that constitute and create legal,
         valid and duly perfected deed of trust or mortgage liens in such
         properties and interests and assignments of and security interests in
         the oil and gas attributable to such properties and interests and the
         proceeds thereof, and (c) covering such other matters as Lender may
         request."

         Section 2.6. PetroQuest Oil & Gas. The following section is hereby
added to Article VI of the Original Agreement:

                  "Section 6.18. PetroQuest Oil & Gas. Parent shall cause the
         assets of PetroQuest Oil & Gas at all times to consist solely of
         beneficial interests in oil and gas properties, the legal interest of
         which is owned by Persons other than Restricted Persons. Parent shall
         remain the sole member of PetroQuest Oil & Gas."

         Section 2.7. Unrestricted Subsidiaries. The following section is hereby
added to Article VI of the Original Agreement:

                  "Section 6.19. Unrestricted Subsidiaries. Parent and Borrower
         will insure that each Unrestricted Subsidiary complies with each
         indenture, mortgage, deed of trust, security agreement, lease,
         franchise, agreement, contract or other instrument or obligation to
         which such Unrestricted Subsidiary is a party or by which it or any of
         its properties is bound, and with all Laws, regulations, and orders
         applicable to such Unrestricted Subsidiary or its properties, business
         and affairs, including Environmental Laws, if such Unrestricted
         Subsidiary's failure so to comply would impose any Liability on any
         Restricted Person, require any Restricted Person to pay or perform any
         Liability owing by any Unrestricted Subsidiary, or could otherwise
         cause a Material Adverse Change. Parent and Borrower will insure that
         no Unrestricted Subsidiary takes, or omits to take, any action if such
         action or omission would cause Parent or Borrower to be unable to
         remake its representations and warranties hereunder."

         Section 2.8. Indebtedness. Section 7.1 of the Original Agreement is
hereby amended by adding the following sentence thereto as a new paragraph after
subsection (f) thereof:

                  "No Unrestricted Subsidiary shall create, incur, assume, or
         otherwise become liable with respect to any Indebtedness other than
         Non-Recourse Indebtedness and no Unrestricted Subsidiary shall have
         Non-Recourse Indebtedness in excess of $25,000,000 at any one time
         outstanding."

         Section 2.9. Limitations on Investments and New Businesses. The last
sentence of Section 7.7 of the Original Agreement is hereby amended in its
entirety to read as follows:

                                       4
<PAGE>   5

                  "As used in this section and the following Section 7.8,
         'Permitted Investments' means (i) Cash Equivalents, (ii) loans to
         Parent, Borrower, or any Guarantor that is a Subsidiary of Borrower,
         (iii) capital contributions or other equity investments in Borrower or
         any Guarantor that is a Subsidiary of Parent, and (iv) capital
         contributions or other equity investments in any Unrestricted
         Subsidiary by Parent which do not exceed the aggregate amount of
         $10,000 in any Unrestricted Subsidiary."

                                  ARTICLE III.

                          Conditions of Effectiveness

         Section 3.1. Effective Date. This Amendment shall become effective as
of the date first above written when and only when Lender shall have received,
at Lender's office (i) a counterpart of this Amendment executed and delivered by
each Restricted Person that is a party hereto, and (ii) such supporting
documents as Lender may reasonably request.

                                  ARTICLE IV.

                         Representations and Warranties

         Section 4.1. Representations and Warranties of Parent and the LLC. In
order to induce Lender to enter into this Amendment, each of the LLC and Parent
represents and warrants to Lender that:

                  (a) The representations and warranties contained in Article V
         of the Credit Agreement are true and correct at and as of the time of
         the effectiveness hereof.

                  (b) Each Restricted Person is duly authorized to execute and
         deliver this Amendment and the other Loan Documents to which it is a
         party and is and will continue to be duly authorized to borrow and to
         perform its obligations under the Credit Agreement. Each Restricted
         Person has duly taken all corporate action necessary to authorize the
         execution and delivery of this Amendment and the other Loan Documents
         to which it is a party and to authorize the performance of the
         obligations of such Restricted Person thereunder.

                  (c) The execution and delivery by each Restricted Person of
         this Amendment and the other Loan Documents to which it is a party, the
         performance by each Restricted Person of its obligations hereunder and
         thereunder and the consummation of the transactions contemplated hereby
         and thereby do not and will not conflict with any provision of law,
         statute, rule or regulation or of the certificate of incorporation and
         bylaws of any Restricted Person, or of any material agreement,
         judgment, license, order or permit applicable to or binding upon any
         Restricted Person, or result in the creation of any Lien, charge or
         encumbrance upon any assets or properties of any Restricted Person. No
         consent, approval, authorization or order of any court or governmental
         authority or third party is required in connection with the execution
         and delivery by any Restricted Person of

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<PAGE>   6

         this Amendment or the other Loan Documents to which it is a party or to
         consummate the transactions contemplated hereby or thereby.

                  (d) When duly executed and delivered, this Amendment will be a
         legal and binding instrument and agreement of each Restricted Person
         that is a party hereto, enforceable in accordance with its terms. Each
         other Loan Document is and shall continue to be the legal, valid and
         binding obligation of each Restricted Person that is a party thereto,
         enforceable against such Restricted Person in accordance with their
         respective terms.

                  (e) The Initial Financial Statements fairly present Parent's
         Consolidated financial position at such date and the Consolidated
         statement of operations and the changes in Consolidated financial
         position for the periods ending on such date for Parent. Copies of such
         financial statements have heretofore been delivered to Lender. Since
         the date of the Initial Financial Statements, no Material Adverse
         Change has occurred.

                  (f) No Default or Event of Default has occurred or is
         continuing.

                                   ARTICLE V.

                                 Miscellaneous

         Section 5.1. Ratification of Agreements. Each of the Loan Documents as
they may be amended or affected by this Amendment is hereby ratified and
confirmed in all respects. Any reference to the Credit Agreement in any Loan
Document shall be deemed to refer to this Amendment also. The execution,
delivery and effectiveness of this Amendment shall not, except as expressly
provided herein or therein, operate as a waiver of any right, power or remedy of
Lender under the Credit Agreement, the Note, or any other Loan Document nor
constitute a waiver of any provision of the Credit Agreement, the Note or any
other Loan Document. It is the intention of the parties hereto that all of the
Liens, privileges, priorities, and equities existing and to exist under and in
accordance with the terms of the Loan Documents are hereby renewed, extended,
and carried forward as security for the Obligations. The LLC hereby ratifies and
confirms the Note and agrees that its obligations and covenants thereunder are
unimpaired by the Merger and shall remain in full force and effect. The LLC
hereby unconditionally assumes all obligations, duties, and responsibilities of
the Corporation under the Credit Agreement and all other Loan Documents to which
the Corporation was a party. Parent hereby ratifies and confirms that certain
Guaranty dated as of December 21, 2000 made by it in favor of Lender and agrees
that its obligations and covenants thereunder are unimpaired by the Merger or by
this Amendment and shall remain in full force and effect.

         Section 5.2. Survival of Agreements. All representations, warranties,
covenants and agreements of Parent and the LLC herein shall survive the
execution and delivery of this Amendment and the performance hereof, including
without limitation the making or granting of the Loan, and shall further survive
until all of the Obligations are paid in full. All statements and agreements
contained in any certificate or instrument delivered by any Restricted Person
hereunder or under

                                       6
<PAGE>   7

the Credit Agreement to Lender shall be deemed to constitute representations and
warranties by, or agreements and covenants of, such Restricted Person under this
Amendment and under the Credit Agreement.

         Section 5.3. Loan Documents. This Amendment is a Loan Document, and all
provisions in the Credit Agreement pertaining to Loan Documents apply hereto.

         Section 5.4. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of Louisiana and any
applicable laws of the United States of America in all respects, including
construction, validity and performance.

         Section 5.5. Counterparts. This Amendment may be separately executed in
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

         THIS AMENDMENT AND THE OTHER 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 OF THE PARTIES.

<PAGE>   8

IN WITNESS WHEREOF, this Amendment is executed as of the date first above
written.

                          ENCAP ENERGY CAPITAL FUND III, L.P.

                          By:  ENCAP INVESTMENTS, L.L.C., general partner

                              By: /s/ D. MARTIN PHILLIPS
                                 --------------------------
                                 D. Martin Phillips
                                 --------------------------
                                 Managing Director
                                 --------------------------

                          PETROQUEST ENERGY, L.L.C.

                          By: PETROQUEST ENERGY, INC., a Delaware corporation,
                              sole member

                              By: /s/ CHARLES T. GOODSON
                                 --------------------------
                                 Charles T. Goodson
                                 --------------------------
                                 Chairman of the Board and
                                 Chief Executive Officer
                                 --------------------------

                          PETROQUEST ENERGY, INC., a Delaware corporation

                          By: /s/ CHARLES T. GOODSON
                             --------------------------
                             Charles T. Goodson
                             --------------------------
                             Chairman of the Board and
                             Chief Executive Officer
                             --------------------------

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