Exhibit 4.1









                               FOURTH AMENDMENT TO
                                CREDIT AGREEMENT




                                     between






                     GOODRICH PETROLEUM COMPANY OF LOUISIANA
                             GPC, INC. OF LOUISIANA
                           NATIONAL MARKETING COMPANY
                      PECOS PIPELINE AND PRODUCING COMPANY


                                       and





                                  COMPASS BANK




                                 Effective as of
                                  June 1, 1997





                      FOURTH AMENDMENT TO CREDIT AGREEMENT
                      ------------------------------------

                  This FOURTH AMENDMENT TO CREDIT  AGREEMENT (this  "Amendment")
is made and entered into  effective as of June 1, 1997, by and between  GOODRICH
PETROLEUM COMPANY OF LOUISIANA ("GPCL"), a Nevada corporation, formerly known as
American National  Petroleum  Company,  successor by merger to Patrick Petroleum
Corporation of Michigan, a Michigan corporation, GPC, INC. OF LOUISIANA ("GPC"),
a Nevada  corporation,  NATIONAL MARKETING  COMPANY, a Delaware  corporation and
PECOS PIPELINE AND PRODUCING COMPANY, a Texas  Corporation,  (collectively,  the
"Borrower"),   GOODRICH   PETROLEUM   CORPORATION,   a   Delaware   corporation,
("Goodrich"), and COMPASS BANK, a Texas state chartered banking corporation (the
"Lender").

                              W I T N E S S E T H :
                              - - - - - - - - - -  

                  WHEREAS,  GPCL,  the Lender,  and  Goodrich are parties to the
Credit  Agreement dated August 16, 1995, as amended by First Amendment to Credit
Agreement  dated as of December 15, 1995, and Letter  Amendment  dated March 26,
1996,  and Second  Amendment to Credit  Agreement  dated as of June 1, 1996, and
Letter  Amendment  dated  November  12,  1996,  and as further  amended by Third
Amendment  to Credit  Agreement  dated as of January 31, 1997 (as  amended,  the
"Agreement"),  pursuant  to which the  Lender  has  extended  credit to GPCL and
Goodrich has guaranteed the payment and performance of certain  indebtedness and
other obligations of GPCL to the Lender; and

                  WHEREAS, the parties hereto desire to amend the Agreement as 
hereinafter set forth;

                  NOW,  THEREFORE,  in consideration of the mutual covenants and
agreements  contained in the Agreement and this  Amendment,  the parties  hereto
agree as follows:


                                    ARTICLE I

                         DEFINITIONS AND INTERPRETATION
                         ------------------------------

                  1.1 Terms  Defined  Above.  As used herein,  each of the terms
"Agreement,"  "Amendment,"  "Borrower," "GPC",  "GPCL," "Goodrich," and "Lender"
shall have the meaning assigned to such term hereinabove.

                  1.2 Terms  Defined in  Agreement.  As used  herein,  each term
defined  in the  Agreement  shall  have  the  meaning  assigned  thereto  in the
Agreement, unless expressly provided herein to the contrary.

                  1.3 References.  References  in this  Amendment to Article or
Section  numbers  shall be to Articles  and Sections of this  Amendment,  unless




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expressly  stated to the  contrary.  References  in this  Amendment to "hereby,"
"herein," "hereinafter," "hereinabove," "hereinbelow," "hereof," and "hereunder"
shall  be to this  Amendment  in its  entirety  and not  only to the  particular
Article or Section in which such reference appears.

                  1.4 Articles and Sections.  This  Amendment,  for  convenience
only, has been divided into Articles and Sections and it is understood  that the
rights,  powers,  privileges,  duties,  and other legal relations of the parties
hereto shall be determined from this Amendment as an entirety and without regard
to such  division  into  Articles and  Sections  and without  regard to headings
prefixed to such Articles and Sections.

                  1.5 Number  and  Gender.   Whenever  the  context   requires,
reference  herein made to the single  number shall be  understood to include the
plural and  likewise  the plural shall be  understood  to include the  singular.
Words  denoting sex shall be construed to include the masculine,  feminine,  and
neuter,  when such construction is appropriate,  and specific  enumeration shall
not exclude the general,  but shall be construed as  cumulative.  Definitions of
terms  defined in the  singular and plural  shall be equally  applicable  to the
plural or singular, as the case may be.


                                   ARTICLE II

                             AMENDMENTS TO AGREEMENT
                             -----------------------

                  The Agreement is hereby amended as follows:

                  2.1    Amendment of Section 1.2. Section 1.2 of the Agreement
                         ------------------------
is hereby amended as follows:


                  The  following  definition  is  amended  to  read  as
follows:

                  "Commitment Termination Date" shall mean June 1, 2000."
                   ----------------------------------------------------  

                  2.2    Amendment of Section  2.7(a).  The first  sentence of
                         ----------------------------
Section 2.7(a) of the Agreement is hereby amended to read as follows:

                    (a)  "Effective  June 1, 1997,  the Borrowing  Base shall be
                    $21,000,000 until the next Borrowing Base review.

                  2.3    Amendment  of  Section  8.3.  The  address  of National
                         ---------------------------
 Marketing  Company  and  Pecos Pipeline and Producing Company is as follows:

                                    333 Texas Street, Suite 1375
                                    Shreveport, Louisiana 71101
                                    Attention: Roland L. Frautschi
                                    Telecopy: (318) 429-2296



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                                   ARTICLE III

                                   CONDITIONS
                                   ----------

                  The  obligation  of the  Lender  to  amend  the  Agreement  as
provided  herein is  subject  to the  fulfillment  of the  following  conditions
precedent:

                  3.1 Receipt of  Documents  and Other  Items.  The Lender shall
                      ---------------------------------------
have received,  reviewed,  and approved the following documents and other items,
appropriately  executed when necessary and in form and substance satisfactory to
the Lender:

                  (a)    multiple  counterparts  of this  Amendment  executed 
                         by the  Borrower and  Goodrich, as requested by the 
                         Lender;

                  (b)    Security Agreement, Stock Pledge, of Goodrich Petroleum
                         Company of Louisiana, pledging the stock of Pecos 
                         Pipeline & Producing Company and National Marketing 
                         Company;

                  (c)    Assignment of Interest in Joint Venture Agreement dated
                         September 1, 1993, by and between National Marketing 
                         Company and Mitchell Marketing Company; and

                  (d)    Assignment  of  Interest in Joint  Venture  Agreement
                         dated January 1, 1990, by and between Pecos  Pipeline
                         and Producing Company and Ferguson Crossing Pipe Line
                         Company,   as  amended  by  Amendment   dated  as  of
                         September 1, 1993, by and between Pecos  Pipeline and
                         Producing Company and Southwestern Gas Pipeline, Inc.

                  3.2 Accuracy  of   Representations   and   Warranties.   The
                      -------------------------------------------------
representations  and warranties  contained in Article IV of the Agreement and in
any other Loan Document shall be true and correct, except as affected by the 
transactions contemplated in the Agreement and this Amendment.

                  3.3  Matters Satisfactory  to  Lender.  All  matters  incident
                       --------------------------------
to  the  consummation  of  the  transactions  contemplated  hereby  shall  be 
satisfactory to the Lender.


                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES
                         ------------------------------

                  Each of the Borrower and Goodrich hereby  expressly  re-makes,
in favor of the Lender, all of the  representations  and warranties set forth in
Article IV of the Agreement and set forth in any other Loan Document to which it
is a party, and represents and warrants that all such



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representations and warranties remain true and unbreached, except as affected by
the transactions contemplated in the Agreement and this Amendment.


                                    ARTICLE V

                                  RATIFICATION
                                  ------------

                  Each of the  parties  hereto does hereby  adopt,  ratify,  and
confirm the  Agreement and the other Loan  Documents to which it is a party,  in
all things in accordance  with the terms and provisions  thereof,  as amended by
this Amendment and the documents executed in connection herewith.

                                   ARTICLE VI

                                  MISCELLANEOUS
                                  -------------

                  6.1 Scope  of  Amendment.  The  scope  of this  Amendment  is
expressly  limited to the matters  addressed herein and this Amendment shall not
operate as a waiver of any past, present, or future breach, Default, or Event of
Default under the Agreement, except to the extent, if any, that any such breach,
Default, or Event of Default is remedied by the effect of this Amendment.

                  6.2 Agreement as Amended.  All references to the Agreement in
any  document   heretofore  or  hereafter   executed  in  connection   with  the
transactions  contemplated  in the  Agreement  shall be  deemed  to refer to the
Agreement as amended by this Amendment.

                  6.3 Parties in  Interest.  All provisions  of this  Amendment
shall be  binding  upon and shall  inure to the  benefit  of the  Borrower,  the
Lender, Goodrich, and their respective successors and permitted assigns.

                  6.4 Rights of Third Parties. All provisions herein are imposed
solely  and  exclusively  for  the  benefit  of the  parties  hereto  and  their
respective successors and permitted assigns. No other Person shall have standing
to require  satisfaction  of such  provisions in accordance with their terms and
any or all of such  provisions  may be freely  waived in whole or in part by the
Lender at any time if in its sole discretion it deems it advisable to do so.

                  6.5 Entire  Agreement. THIS AMENDMENT  CONSTITUTES THE ENTIRE
AGREEMENT  AMONG THE  PARTIES  HERETO  WITH  RESPECT TO THE  SUBJECT  HEREOF AND
SUPERSEDES  ANY PRIOR  AGREEMENT,  WHETHER  WRITTEN OR ORAL,  AMONG SUCH PARTIES
REGARDING THE SUBJECT HEREOF.  FURTHERMORE IN THIS REGARD,  THIS AMENDMENT,  THE
AGREEMENT,  AND THE OTHER PARTIES LOAN DOCUMENTS  REPRESENT,  COLLECTIVELY,  THE
FINAL  AGREEMENT  AMONG  THE  PARTIES  THERETO  AND MAY NOT BE  CONTRADICTED  BY
EVIDENCE  OF  PRIOR,  CONTEMPORANEOUS  OR  SUBSEQUENT  ORAL  AGREEMENTS  OF SUCH
PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG SUCH PARTIES.



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                  6.6 Governing  Law. THIS  AMENDMENT AND ALL ISSUES  ARISING IN
CONNECTION HEREWITH AND THE TRANSACTIONS  CONTEMPLATED HEREBY SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF TEXAS WITHOUT GIVING
EFFECT TO PRINCIPLES THEREOF RELATING TO CONFLICTS OF LAW.

                  6.7 Jurisdiction  and Venue.  ALL ACTIONS OR PROCEEDINGS WITH
RESPECT TO, ARISING  DIRECTLY OR INDIRECTLY IN CONNECTION  WITH, OUT OF, RELATED
TO OR FROM THIS  AMENDMENT,  THE  AGREEMENT,  OR ANY OTHER LOAN  DOCUMENT MAY BE
LITIGATED,  AT THE SOLE DISCRETION AND ELECTION OF THE LENDER,  IN COURTS HAVING
SITUS IN HOUSTON, HARRIS COUNTY, TEXAS. EACH OF THE BORROWER AND GOODRICH HEREBY
SUBMITS TO THE  JURISDICTION  OF ANY LOCAL,  STATE,  OR FEDERAL COURT LOCATED IN
HOUSTON,  HARRIS  COUNTY,  TEXAS,  AND  HEREBY  WAIVES ANY RIGHTS IT MAY HAVE TO
TRANSFER OR CHANGE THE  JURISDICTION OR VENUE OF ANY LITIGATION  BROUGHT AGAINST
IT BY THE LENDER IN ACCORDANCE WITH THIS SECTION.

                  6.8 Waiver  of Rights to Jury  Trial.  EACH OF THE  BORROWER,
GOODRICH,   AND  THE  LENDER  HEREBY  KNOWINGLY,   VOLUNTARILY,   INTENTIONALLY,
IRREVOCABLY,  AND  UNCONDITIONALLY  WAIVES  ALL  RIGHTS  TO TRIAL BY JURY IN ANY
ACTION, SUIT, PROCEEDING,  COUNTERCLAIM,  OR OTHER LITIGATION THAT RELATES TO OR
ARISES OUT OF THIS AMENDMENT,  THE AGREEMENT,  OR ANY OTHER LOAN DOCUMENT OR THE
ACTS OR  OMISSIONS  OF THE  LENDER  IN THE  ENFORCEMENT  OF ANY OF THE  TERMS OR
PROVISIONS  OF THIS  AMENDMENT,  THE  AGREEMENT,  OR ANY OTHER LOAN  DOCUMENT OR
OTHERWISE  WITH RESPECT  THERETO.  THE PROVISIONS OF THIS SECTION ARE A MATERIAL
INDUCEMENT FOR THE LENDER ENTERING INTO THIS AMENDMENT.

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

                                   BORROWER:

                                   GOODRICH PETROLEUM COMPANY OF LOUISIANA


                                    By: /s/ Walter G. Goodrich
                                        ----------------------------------
                                              Walter G. Goodrich
                                              President


                                    GPC, INC. OF LOUISIANA


                                    By: /s/Walter G. Goodrich
                                        ----------------------------------
                                              Walter G. Goodrich
                                              President



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                                    NATIONAL MARKETING COMPANY


                                    By: /s/ Walter G. Goodrich
                                        ----------------------------------
                                              Walter G. Goodrich
                                              President


                                    PECOS PIPELINE AND
                                    PRODUCING COMPANY


                                    By: /s/ Walter G. Goodrich
                                        ----------------------------------
                                              Walter G. Goodrich
                                              President


                                    GUARANTOR:

                                    GOODRICH PETROLEUM CORPORATION


                                    By: /s/ Walter G. Goodrich
                                        ----------------------------------
                                              Walter G. Goodrich
                                              President



                                    LENDER:

                                    COMPASS BANK



                                    By: /s/ Allison Hammer
                                        ----------------------------------
                                              Allison Hammer
                                              Vice President




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