EXHIBIT 10.20



                         MORTGAGE, ASSIGNMENT, SECURITY
                        AGREEMENT AND FINANCING STATEMENT

                                      FROM

                        CALPINE CORPORATION, as Mortgagor

                          (Taxpayer I.D. No.77-0212977)

                                       TO

                            THE BANK OF NOVA SCOTIA,
                            for itself and as Agent,
                                  as Mortgagee

                         (Taxpayer I.D. No. 13-494-1099)

                             Dated as of May 1, 2002

- --------------------------------------------------------------------------------

"THIS INSTRUMENT SECURES PAYMENT OF FUTURE ADVANCES."

"THIS FINANCING STATEMENT COVERS AS-EXTRACTED  COLLATERAL WHICH WILL BE FINANCED
AT THE WELLHEADS OF THE WELLS LOCATED ON THE  PROPERTIES  DESCRIBED IN EXHIBIT A
HERETO."

"THE  MORTGAGOR HAS AN INTEREST OF RECORD IN THE IMMOVABLE  PROPERTY  CONCERNED,
WHICH IS DESCRIBED IN EXHIBIT A HERETO."

"SOME OF THE PERSONAL PROPERTY  CONSTITUTING A PORTION OF THE MORTGAGED PROPERTY
IS TO BE  AFFIXED  TO THE  PROPERTIES  DESCRIBED  IN  EXHIBIT A HERETO  AND THIS
FINANCING  STATEMENT  IS TO BE FILED AS A FIXTURE  FILING AS DEFINED IN LA. REV.
STAT. SECTION 10:9-102(a)(40)."

THIS INSTRUMENT WAS PREPARED BY:

Kevin L. Shaw, Esq.
Mayer, Brown, Rowe & Maw
700 Louisiana Street, 36th Floor
Houston, TX  77002






MORTGAGE, ASSIGNMENT,                  *     UNITED STATES OF AMERICA
SECURITY AGREEMENT
AND FINANCING STATEMENT                *     STATE OF CALIFORNIA

                          BY           *     COUNTY OF SANTA CLARA

CALPINE CORPORATION,                   *
a Delaware corporation                       STATE OF CALIFORNIA
in Favor of                            *
THE BANK OF NOVA SCOTIA,                     COUNTY OF SAN FRANCISCO
a Canadian chartered bank              *

*  *  *  *  *  *  *  *  *  *  *  *  *  *



          BE IT  KNOWN,  that on  this  2nd day of May,  2002,  before  me,  the
undersigned  Notary Public duly  commissioned and qualified in and for the State
and County first written above, and in the presence of the undersigned witnesses
personally came and appeared:

CALPINE  CORPORATION,  a Delaware  corporation  having a mailing address of 1000
Louisiana  Street,   Suite  800,  Houston  TX  77002,  and  a  federal  taxpayer
identification  number of 77-0212977,  appearing herein through Robert D. Kelly,
its Executive  Vice  President,  duly  authorized by resolutions of the Board of
Directors of said  corporation,  a certified copy of which is attached hereto as
Exhibit B (herein called the "Mortgagor" or the  "Borrower"),  who declared that
Mortgagor does by these presents  declare and acknowledge an  indebtedness  unto
Scotiabank (as hereinafter defined)




          BE IT  KNOWN,  that on  this  1ST day of May,  2002,  before  me,  the
undersigned  Notary Public duly  commissioned and qualified in and for the State
and  County  second  written  above,  and in  the  presence  of the  undersigned
witnesses personally came and appeared:

     THE BANK OF NOVA SCOTIA, a Canadian chartered bank ("Scotiabank"), having a
     mailing  address of 580 California  Street,  Suite 2100, San Francisco,  CA
     94119,  and  a  federal  taxpayer  identification  number  of  13-494-1099,
     appearing  herein through its undersigned  representative,  duly authorized
     hereunto

(herein called the "Agent"), here present who accepts this instrument.


                                      -1-


Borrower and Agent declare as follows:



                                    RECITALS

Borrower,  certain  institutional  lenders  (individually,  a "2002  Lender" and
collectively,  the "2002  Lenders")  and  Scotiabank  have entered into a Credit
Agreement,  dated as of  March  8,  2002  (herein,  as the same may be  amended,
modified or supplemented  from time to time,  called the "2002 Loan Agreement"),
pursuant to which the 2002  Lenders  have  agreed to make loans to Borrower  and
issue or cause to be  issued  letters  of credit  for the  benefit  of  Borrower
(individually,  a "2002 Letter of Credit" and collectively, the "2002 Letters of
Credit")  in amounts not to exceed at any one time  outstanding  $1,600,000,000,
and Borrower,  to evidence its  indebtedness  to the 2002 Lenders under the 2002
Loan Agreement,  has executed and delivered (or will execute and deliver) to the
2002 Lenders its secured  promissory notes in the aggregate,  original principal
amount of $1,600,000,000, to mature not later than May 24, 2003 (individually, a
"2002 Loan Note" and collectively,  the "2002 Loan Notes"),  the 2002 Loan Notes
being payable to the order of the 2002 Lenders, bearing interest as provided for
therein,   and  containing   provisions  for  payment  of  attorneys'  fees  and
acceleration of maturity in the event of default, as therein set forth.

Borrower, certain institutional lenders (individually,  an "Existing Lender" and
collectively,  the "Existing Lenders";  and together with the 2002 Lenders,  the
"Lenders") and Scotiabank have entered into a Second Amended and Restated Credit
Agreement  dated  as of May  23,  2000  (herein,  as the  same  may be  amended,
modified,  or  supplemented  from  time to time,  called  the  "Existing  Credit
Agreement")  pursuant to which the Existing Lenders have agreed to make loans to
Borrower  and issue or cause to be issued any  letters of credit for the benefit
of Borrower (individually,  an "Existing Letter of Credit" and collectively, the
"Existing  Letters  of  Credit")  in  amounts  not to  exceed  at any  one  time
$400,000,000, and Borrower, to evidence its indebtedness to the Existing Lenders
under the Existing Credit Agreement,  has executed and delivered to the Existing
Lenders  its  secured  promissory  notes to mature not later  than May 24,  2003
(individually,  an "Existing  Loan Note" and  collectively,  the "Existing  Loan
Notes"),  the  Existing  Loan Notes being  payable to the order of the  Existing
Lenders, bearing interest as provided for therein, and containing provisions for
payment of attorneys' fees and acceleration of maturity in the event of default,
as therein set forth.  The 2002 Loan Agreement and the Existing Credit Agreement
are herein collectively called the "Credit  Agreements." The 2002 Loan Notes and
the  Existing  Loan  Notes  are  herein  individually  called a "Loan  Note" and
collectively  called  the "Loan  Notes".  The 2002  Letters  of  Credit  and the
Existing Letters of Credit are herein  individually  called a "Letter of Credit"
and collectively called the "Letters of Credit".

It is a condition precedent to the obligation of the Lenders to make Loans under
the Credit  Agreements,  to issue or cause to be issued  Letters of Credit under
the Credit  Agreements and to the  obligations of the Agent,  the Lenders or the
Lender  Parties (as the case may be), that the  Mortgagor  executes and delivers
this instrument.


                                      -2-


For all purposes of this instrument, unless the context otherwise requires:

          A. "Affiliate" of any Person means any other Person which, directly or
     indirectly, controls, is controlled by or is under common control with such
     Person  (excluding any trustee under, or any committee with  responsibility
     for  administering,  any Plan (as  defined  in the Credit  Agreements)).  A
     Person shall be deemed to be "controlled by" any other Person if such other
     Person possesses, directly or indirectly, power

               (a) to vote  10% or more of the  securities  (on a fully  diluted
          basis) having  ordinary  voting power for the election of directors or
          managing general partners; or

               (b) to  direct  or cause  the  direction  of the  management  and
          policies of such Person whether by contract or otherwise.

          B. "Agent" is defined in the Preamble of this instrument.

          C.  "Applicable  Law" means with respect to any Person or matter,  any
     federal, state, regional, tribal or local statute, law, code, rule, treaty,
     convention,   application,   order,  decree,  consent  decree,  injunction,
     directive,  determination or other  requirement  (whether or not having the
     force of law) relating to such Person or matter and, where applicable,  any
     interpretation thereof by a Governmental Authority having jurisdiction with
     respect  thereto  or  charged  with the  administration  or  interpretation
     thereof.

          D. "Borrower" is defined in the Preamble of this instrument.

          E. "Credit Agreements" is defined in Recital 2 to this instrument.

          F. "Deed of Trust" means each mortgage,  deed of trust,  or other real
     property collateral  security instrument in a form reasonably  satisfactory
     to the Agent,  executed and delivered pursuant to Section 8.1.8 of the 2002
     Credit Agreement, as amended, supplemented,  restated or otherwise modified
     from time to time, including, without limitation, this instrument.

          G.  "Environmental  Laws"  shall mean any and all  present  and future
     United States federal,  state and local laws or regulations,  codes, plans,
     orders, decrees,  judgments,  injunctions and lawfully imposed requirements
     issued,   promulgated  or  entered  thereunder  relating  to  pollution  or
     protection of the  environment,  including  laws relating to reclamation of
     land and waterways and laws relating to emissions,  discharges, releases or
     threatened releases of pollutants, contaminants,  chemicals, or industrial,
     toxic or hazardous  substances or wastes into the  environment  (including,
     without limitation,  ambient air, surface water, ground water, land surface
     or subsurface strata) or otherwise relating to the manufacture, processing,
     distribution,  use, treatment,  storage, disposal, transport or handling of
     pollutants,  contaminants,  chemicals,  or  industrial,  toxic or hazardous
     substances or wastes.


                                      -3-


          H. "Existing  Assignment  Agreement" means that certain Assignment and
     Security  Agreement executed and delivered by Calpine Gilroy Cogen, L.P., a
     California limited  partnership,  pursuant to Section 6.1.3 of the Existing
     Credit  Agreement,  substantially  in the form of Exhibit F to the Existing
     Credit  Agreement,  as  amended,  supplemented,  amended  and  restated  or
     otherwise modified from time to time.

          I.  "Existing  Credit  Agreement"  is  defined  in  Recital  2 to this
     instrument.

          J. "Existing Lenders" is defined in Recital 2 to this instrument.

          K.  "Existing  Letters  of  Credit"  is  defined  in Recital 2 to this
     instrument.

          L. "Existing Loan Documents" means the Existing Credit Agreement,  the
     Existing  Loan Notes,  the Existing  Assignment  Agreement,  and each other
     relevant  agreement,  document  or  instrument  (including  the fee  letter
     described in Section 3.3.2 of the Existing Credit  Agreement)  delivered in
     connection therewith.

          M. "Existing Loan Notes" is defined in Recital 2 to this instrument.

          N. "Fee Letter"  means the fee letter  agreement  described in Section
     3.3.2 of the 2002 Credit Agreement.

          O.  "Governmental   Authority"  means  any  and  all  courts,  boards,
     agencies, commissions,  offices or authorities of any nature whatsoever for
     any governmental unit (federal, state, county, district,  municipal,  city,
     tribe or otherwise)  whether now or hereafter in existence charged with the
     administration, interpretation or enforcement of any Applicable Law.

          P.  "Guaranty"  means  the  guaranty  executed  and  delivered  by the
     Guarantors  pursuant  to  Section  6.1.3  of  the  2002  Credit  Agreement,
     substantially in the form of Exhibit H thereto, as amended, supplemented or
     otherwise modified from time to time.

          Q.  "Hazardous  Materials  Indemnity"  means  that  certain  hazardous
     materials  indemnity  executed and  delivered  by the Borrower  pursuant to
     Section  8.1.8 of the 2002  Credit  Agreement,  as  amended,  supplemented,
     restated or otherwise modified from time to time.

          R. "Hedging  Agreements"  means:  (a) interest  rate swap  agreements,
     basis  swap  agreements,   interest  rate  cap  agreements,   forward  rate
     agreements,  interest  rate  floor  agreements  and  interest  rate  collar
     agreements,  and all other  agreements or arrangements  designed to protect
     such Person against  fluctuations  in interest  rates or currency  exchange
     rates,  and (b) forward  contracts,  options,  futures  contracts,  futures
     options,  commodity swaps, commodity options,  commodity collars, commodity
     caps, commodity floors and


                                      -4-


     all other  agreements  or  arrangements  designed  to protect  such  Person
     against fluctuations in the price of commodities.

          S.  "Hedging  Obligations"  means  with  respect  to any  Person,  all
     liabilities  (including  without  limitation  obligations  and  liabilities
     arising in connection with or as a result of early or premature termination
     of a Hedging  Agreement,  whether or not occurring as a result of a default
     thereunder) of such Person under a Hedging Agreement.

          T. "Hydrocarbons"  means collectively,  oil, gas, casinghead gas, drip
     gasoline, natural gasoline, condensate,  distillate and all other liquid or
     gaseous  hydrocarbons and related minerals and all products  therefrom,  in
     each case whether in a natural or a processed state.

          U.  "Indebtedness",  "Note"  and  "Notes"  shall  have the  respective
     meanings set forth in Section 1.2 hereof.

          V.  "Indemnification   Claim"  is  defined  in  Section  3.6  of  this
     instrument.

          W.  "Indemnified  Person" means Agent and each of the Lender  Parties,
     and their respective employees,  affiliates,  agents and attorneys, and any
     other Person to be indemnified under this instrument.

          X. "Joint Operating  Agreements" shall mean, with respect to the lands
     described in Exhibit A, the respective  operating  agreement  burdening the
     lands described in Exhibit A.

          Y. "lands  described in Exhibit A" shall  include the real property or
     other  interest  in any  lands  which are  either  described  in  Exhibit A
     attached hereto or the description of which is incorporated in Exhibit A by
     reference to an instrument or document containing in, or referring to, such
     a description,  and shall also include any lands now or hereafter  unitized
     or  pooled  with  lands  which are  either  described  in  Exhibit A or the
     description of which is incorporated in Exhibit A by reference and Fixtures
     and all rights,  titles and interests  appurtenant  thereto.  References to
     Exhibit A shall include, where applicable, Exhibit A-1 as well.

          Z. "Leases" means any and all leases (including without limitation oil
     and gas leases and oil, gas and other minerals  leases),  surface leases or
     easements,  subleases,  licenses,  concessions,  operating  rights or other
     agreements  (written or verbal,  now or hereafter in effect)  which grant a
     possessory  interest  in and to,  or the  right  to  explore,  use,  lease,
     license,  possess, produce, process, store and transport Hydrocarbons from,
     operate from, or otherwise enjoy, the Mortgaged Property, together with all
     amendments, modifications, extensions and renewals thereof.

          AA.  "Legal  Requirements"  means (i) any and all  present  and future
     judicial  decisions,  statutes,  rulings,  rules,  regulations,   licenses,
     decisions, orders,


                                      -5-


     injunctions,   decrees,   permits,   certificates   or  ordinances  of  any
     Governmental  Authority  in any way  applicable  to the  Mortgagor,  or the
     Mortgaged Property,  including the ownership,  use,  occupancy,  operation,
     maintenance, repair or reconstruction thereof, and any other Applicable Law
     enacted  by  any   Governmental   Authority   relating  to  health  or  the
     environment,  (ii) the  Mortgagor's  presently  or  subsequently  effective
     Organic  Documents,  (iii) any and all Leases,  (iv) any and all leases and
     other contracts (written or oral) of any nature to which the Mortgagor,  or
     the  Mortgaged  Property  may be  bound  and (v) any and all  restrictions,
     restrictive covenants or zoning,  present and future, as the same may apply
     to the Mortgaged Property.

          BB.  "Lender  Party" or "Lender  Parties"  means,  as the  context may
     require,  the Agent,  any Lender and any Affiliate of any Lender that is an
     issuer under a letter of credit,  and each of their respective  successors,
     transferees and assigns.

          CC. "Loan  Documents"  means the Existing Loan  Documents and the 2002
     Loan Documents.

          DD. "Loan Note" is defined in Recital 2 to this instrument.

          EE.  "Maximum  Lawful  Rate"  means the  maximum  nonusurious  rate of
     interest that may be received,  charged or contracted for under  Applicable
     Law from time to time in effect.

          FF.  "Mortgaged  Property"  shall  mean  the  properties,  rights  and
     interests hereinafter described and defined as the Mortgaged Property.

          GG.  "Obligations"  means  any and all of the  covenants,  warranties,
     representations   and   other   obligations   (other   than  to  repay  the
     Indebtedness)  made or  undertaken by the Mortgagor or others to the Agent,
     the Lender Parties or others as set forth in the Credit Agreements or other
     Loan Documents.

          HH. "oil and gas leases"  shall  include oil, gas and mineral  leases,
     subleases and assignments thereof,  operating rights, servitudes, and shall
     also include subleases and assignments of operating rights.

          II.  "Operating  Equipment"  shall  mean  all  surface  or  subsurface
     machinery,  goods,  equipment,   fixtures,  movable  property  attached  to
     immovable  property  and other  movable  property,  inventory,  facilities,
     supplies or other property of whatsoever kind or nature (excluding drilling
     rigs, trucks,  automotive equipment or other property taken to the premises
     to drill a well or for  other  similar  temporary  uses)  now or  hereafter
     located  on or under  any of the  lands  described  in  Exhibit A which are
     useful for the production,  gathering,  treatment,  processing,  storage or
     transportation of Hydrocarbons (together with all accessions, additions and
     attachments to any thereof),  including, but not by way of limitation,  all
     oil wells, gas wells, water wells, injection wells, casing, tubing, tubular
     goods, rods, pumping units and engines, christmas trees, platforms,



                                      -6-


     derricks,  separators,  steam generators,  compressors,  gun barrels,  flow
     lines,  tanks,  gas systems  (for  gathering,  treating  and  compression),
     pipelines (including gathering lines, laterals and trunklines),  chemicals,
     solutions,  water systems (for  treating,  disposal and  injection),  power
     plants, poles, lines, transformers,  starters and controllers,  supervisory
     control and data acquisition  systems,  machine shops, tools, storage yards
     and equipment stored therein, buildings and camps, telegraph, telephone and
     other communication systems, roads, boats, loading docks, loading racks and
     shipping facilities.

          JJ.  "Organic   Documents"   means  the  Articles  of   Incorporation,
     Certificate of  Incorporation,  limited  liability  company  certificate of
     formation and regulations or operating  agreement,  partnership  agreement,
     limited partnership agreement,  joint venture agreement, trust agreement or
     other  similar  documents  governing  the  organization  and operation of a
     business association.

          KK. "Permits" means all authorizations, approvals, permits, variances,
     land use entitlements, consents, licenses, franchises and agreements issued
     by or  entered  into  with  any  Governmental  Authority  now or  hereafter
     required for all stages of exploration, developing, operating, and plugging
     and  abandoning oil and gas wells  (including,  without  limitation,  those
     shown on Exhibit A) on all or any part of the lands  described in Exhibit A
     (or any other lands any production  from which, or profits or proceeds from
     such  production,  is attributed to any interest in the lands  described in
     Exhibit A).

          LL. "Permitted  Encumbrances" means the outstanding liens,  easements,
     building  lines,  restrictions,   exceptions,   reservations,   conditions,
     limitations,  security interests and other matters (if any) as reflected on
     Exhibit C attached  hereto and the lien and security  interests  created by
     the Security Documents.

          MM.  "Person"  means any  natural  person,  corporation,  partnership,
     limited  liability   company,   firm,   association,   trust,   government,
     governmental  agency or any other entity,  whether acting in an individual,
     fiduciary or other capacity.

          NN.  "Personalty"  means all of the right,  title and  interest of the
     Mortgagor  now  owned  or  hereafter  acquired  in and  to  all  furniture,
     furnishings,  Equipment,  machinery,  Goods,  General  Intangibles,  money,
     Accounts,   receivables,   Contract  Rights,   Inventory,  all  refundable,
     returnable or  reimbursable  fees,  deposits or other funds or evidences of
     credit or indebtedness  deposited by or on behalf of the Mortgagor with any
     Governmental  Authority,  agencies,  boards,  corporations,   providers  of
     utility services,  public or private,  including specifically,  but without
     limitation,  all refundable,  returnable or reimbursable tap fees,  utility
     deposits,  commitment  fees and development  costs,  and all other personal
     property  (other than the  Fixtures) of any kind or character as defined in
     and subject to the provisions of Article 9 of the Uniform  Commercial Code,
     now or hereafter located upon, within or about, or used in connection with,


                                      -7-


     the  lands   described  in  Exhibit  A,  together  with  all   accessories,
     replacements  and  substitutions  thereto  or  therefor  and  the  Proceeds
     thereof.

          OO.  "Pledge  Agreements"  means the pledge  agreements  executed  and
     delivered  pursuant to Section 6.1.4 of the 2002 Credit Agreement,  as such
     agreements  may be amended,  supplemented,  restated or otherwise  modified
     from time to time,  which  will be in  substantially  the form of Exhibit I
     thereto.

          PP. "Production Sale Contracts" shall mean contracts now in effect, or
     hereafter entered into by the Mortgagor, or entered into by the Mortgagor's
     predecessors  in interest,  for the sale,  purchase,  exchange,  gathering,
     transportation,  treating or processing of  Hydrocarbons  produced from the
     lands described in Exhibit A attached hereto and made a part hereof.

          QQ. "Rents and  Revenues"  means all of the rents,  revenues,  income,
     proceeds,  profits  and other  benefits  paid or  payable by parties to the
     Leases other than the Mortgagor for using, leasing, licensing,  possessing,
     operating,  selling or otherwise enjoying the Mortgaged Property, including
     the proceeds from the sale of Hydrocarbons.

          RR.  "Security  Documents"  means  the  Notes,  this  instrument,  the
     financing  statements  and any and all other  instruments  now or hereafter
     executed  by the  Mortgagor  or any other  person or party to  evidence  or
     secure the payment of the  Indebtedness or the performance and discharge of
     the  Obligations,  as any of the  foregoing  may  be  amended,  renewed  or
     extended.  Notwithstanding  that the  definition of Security  Documents and
     various of the components  thereof  include  documents that may be amended,
     renewed  or  extended,  such  definition  shall in no way be  construed  to
     suggest  that any party has agreed  (or is  obligated)  to amend,  renew or
     extend them.

          SS. "2002  Assignment  Agreement"  means that certain  Assignment  and
     Security  Agreement executed and delivered by Calpine Gilroy Cogen, L.P., a
     California  limited  partnership,  pursuant  to  Section  6.1.8 of the 2002
     Credit  Agreement,  substantially  in the  form of  Exhibit  K  hereto,  as
     amended, supplemented, amended and restated or otherwise modified from time
     to time.

          TT. "2002 Loan Agreement" is defined in Recital 1 to this instrument.

          UU. "2002 Lenders" is defined in Recital 1 to this instrument.

          VV.  "2002  Letters  of  Credit"  is  defined  in  Recital  1 to  this
     instrument.

          WW. "2002 Loan Documents"  means the 2002 Credit  Agreement,  the 2002
     Loan Notes, the Pledge  Agreements,  the Guaranty,  the Deeds of Trust, the
     2002  Assignment  Agreement,  the Hazardous  Materials  Indemnity,  the Fee
     Letter, and each other relevant agreement, document or instrument delivered
     in connection therewith.


                                      -8-


          XX. "2002 Loan Notes" is defined in Recital 1 to this instrument.

          YY.  "Taxes"  means all real  property  and personal  property  taxes,
     production taxes, assessments,  permit fees, water, gas, sewer, electricity
     and other utility rates and charges,  charges for any easement,  license or
     agreement  maintained  for the benefit of the Mortgaged  Property,  and all
     other taxes,  charges and assessments and any interest,  costs or penalties
     with respect thereto,  of any kind and nature  whatsoever which at any time
     prior to or after the execution hereof may be charged,  assessed, levied or
     imposed  upon the  Mortgaged  Property  or the  Rents and  Revenues  or the
     ownership, use, occupancy or enjoyment thereof.

          ZZ. "Transportation Agreements" shall mean any contracts or agreements
     entered  into from time to time by the  Mortgagor,  or entered  into by the
     Mortgagor's  predecessors in interest,  relating to the  transportation  of
     Hydrocarbons,   as  any  such   agreement   or  contract  may  be  amended,
     supplemented, restated or otherwise modified from time to time.

          AAA. "Uniform  Commercial Code" shall mean the Uniform Commercial Code
     as in  effect  from  time to  time in the  State  of  Louisiana  (Louisiana
     Commercial  Laws -  Louisiana  Revised  Statutes  Title  10)  or any  other
     applicable state, and the terms "Accounts", "Account Debtor", "As Extracted
     Collateral",  "Deposit  Account",  "Chattel Paper",  "Documents",  "General
     Intangibles", "Goods", "Equipment", "Fixtures", "Inventory", "Instruments",
     and "Proceeds" shall have the respective meanings assigned to such terms in
     the Uniform Commercial Code.

          BBB. "Water Rights" shall mean  (including  without  limitation  those
     described  in Exhibit A hereto) all now or  hereafter  existing or acquired
     water and water rights,  reservoirs and reservoir rights, ditches and ditch
     rights,  wells and well rights,  whether  evidenced or initiated by permit,
     decree,   well  registration,   appropriation  not  decreed,   water  court
     application,  shares  of  stock  or  other  interests  in  mutual  ditch or
     reservoir  companies or carrier ditch or reservoir  companies or otherwise,
     appertaining or appurtenant to or beneficially used or useful in connection
     with the lands  described  in Exhibit  A,  together  with all  pumps,  well
     casings,   wellheads,   electrical   installations,   pumphouses,   meters,
     monitoring wells and systems,  measuring  devices,  pipes,  pipelines,  and
     other structures or personal  property which are or may be used to produce,
     regulate, measure, distribute,  store, or use water from the said water and
     water rights,  reservoirs and reservoir  rights,  ditches and ditch rights,
     wells and well rights.

                                      GRANT

     NOW, THEREFORE, the Mortgagor, for and in consideration of the premises and
as security for the  Indebtedness  as described  below,  by these  presents does
specially mortgage,  collaterally assign,  pledge, affect and hypothecate,  unto
and in favor of the Agent, individually and as agent for the Lender Parties, all
the  Mortgagor's  right,  title and  interest,  whether  now owned or  hereafter
acquired, in and to all of the hereinafter


                                      -9-


described  properties,  rights and interests;  and,  insofar as such properties,
rights  and  interests  consist of  Equipment,  General  Intangibles,  Accounts,
Deposit Accounts, As Extracted Collateral, Contract Rights, Inventory, Fixtures,
Proceeds of  collateral  or any other  personal  property of a kind or character
defined in or subject to the  applicable  provisions  of the Uniform  Commercial
Code  (as in  effect  from  time to time in the  appropriate  jurisdiction  with
respect to each of said properties,  rights and interests), the Mortgagor hereby
grants  to the  Agent,  individually  and as agent  for the  Lender  Parties,  a
continuing security interest therein; namely:

          (a) the lands  described  in  Exhibit  A, and  Leases,  fee,  mineral,
     overriding  royalty,  royalty and other  interests  which are  described in
     Exhibit A,

          (b) the  presently  existing  and (subject to the terms of Section 6.1
     hereof) hereafter arising unitization, unit operating,  communitization and
     pooling agreements and the properties covered and the units created thereby
     (including, without limitation, all units formed under orders, regulations,
     rules,  approvals,  decisions or other  official  acts of any  Governmental
     Authority having jurisdiction) which are specifically  described in Exhibit
     A or which  relate  to any of the  properties  and  interests  specifically
     described in Exhibit A,

          (c) the  Hydrocarbons  which are in,  under,  upon,  produced or to be
     produced from, or which are attributed or allocated to, the lands described
     in Exhibit A,

          (d) the Permits,

          (e) the Production Sale Contracts,

          (f) the Joint Operating Agreements,

          (g) the Transportation Agreements,

          (h) the Hedging Agreements,

          (i) the Leases,

          (j) the Personalty,

          (k) the Rents and Revenues,

          (l) the Operating Equipment,

          (m) the Water Rights, and

          (n)  without  duplication  of any  other  provision  of this  granting
     clause,  all of the Mortgagor's now owned or hereafter  arising or acquired
     Equipment,  Fixtures and other Goods necessary or used in connection  with,
     and Inventory, Accounts, As Extracted Collateral, Deposit Accounts, General
     Intangibles,


                                      -10-


     Contract  Rights,  Chattel  Paper,  Electronic  Chattel  Paper,  Documents,
     Instruments,  and Proceeds arising from, or relating to, the properties and
     lands described in Exhibit A (including Exhibit A-1),

     together  with any and all  corrections  or  amendments  to,  or  renewals,
     extensions or ratifications  of, or replacements or substitutions  for, any
     of  the  same,  or any  instrument  relating  thereto,  and  all  accounts,
     contracts,   contract  rights,   "take-or-pay"  settlements,   buy-outs  or
     buy-downs, gas balancing claims, options,  nominee agreements,  unitization
     and pooling agreements, operating agreements and unit operating agreements,
     processing agreements,  salt water disposal agreements,  farmin agreements,
     farmout  agreements,  joint  venture  agreements,   partnership  agreements
     (including  mining  partnerships),   exploration  agreements,  bottom  hole
     agreements, dry hole agreements,  support agreements,  acreage contribution
     agreements,   surface  use  and  surface  damage  agreements,  net  profits
     agreements,  production payment agreements,  Hedging Agreements,  insurance
     policies, title opinions, title abstracts, title materials and information,
     files, records,  writings,  data bases,  information,  systems,  logs, well
     cores,  fluid samples,  production data and reports,  well testing data and
     reports,  maps,  seismic and geophysical,  geological and chemical data and
     information,  interpretative  and analytical  reports of any kind or nature
     (including,  without limitation,  reserve studies and reserve evaluations),
     computer hardware and software and all  documentation  therefor or relating
     thereto  (including,  without  limitation,  all  licenses  relating  to  or
     covering such computer  hardware,  software  and/or  documentation),  trade
     secrets,  trademarks,  service marks and business names and the goodwill of
     the  business  relating  thereto,   copyrights,   copyright  registrations,
     unpatented inventions, patent applications and patents, accounting records,
     rights-of-way,  franchises, bonds, easements,  servitudes,  surface leases,
     permits, licenses, tenements,  hereditaments,  appurtenances,  concessions,
     occupancy leases,  privileges,  development  rights,  condemnation  awards,
     claims  against  third  parties,  general  intangibles,  rents,  royalties,
     issues, profits,  products and proceeds,  whether now or hereafter existing
     or arising,  used or useful in connection with,  covering,  relating to, or
     arising from or in connection  with, any of the aforesaid items (a) through
     (n), inclusive, in this granting clause mentioned,  and all other things of
     value and incident  thereto  (including,  without  limitation,  any and all
     liens, lien rights,  security  interests and other  properties,  rights and
     interests)  which the  Mortgagor  might at any time have or be entitled to,
     but  excluding  any data or contracts  with respect to which  mortgaging or
     granting of a lien or a security  interest is prohibited by existing  third
     party agreements,

all the aforesaid properties,  rights and interests, together with any additions
thereto  which  may be  subjected  to the lien  and  security  interest  of this
instrument  by  means  of  supplements  hereto,  being  hereinafter  called  the
"Mortgaged Property."

     Subject,  however, to (i) Permitted  Encumbrances  (including all presently
existing royalties,  overriding royalties,  payments out of production and other
burdens   which  are  referred  to  in  Exhibit  A  and  which  are  taken  into
consideration in computing any percentage, decimal or fractional interest as set
forth in Exhibit A), (ii) the assignment of


                                      -11-


production contained in Article III hereof, but only insofar and so long as said
assignment of production is not inoperative  under the provisions of Section 3.5
hereof,  and (iii) the  condition  that  neither  the Agent nor any of the other
Lender  Parties  shall be  liable  in any  respect  for the  performance  of any
covenant or obligation (including without limitation measures required to comply
with Environmental Laws) of the Mortgagor in respect of the Mortgaged Property.

     The Mortgaged  Property is to remain so specially  mortgaged,  affected and
hypothecated  unto and in favor of the  Agent  for  itself  and as agent for the
Lender  Parties  to  secure  the  payment  of the  Indebtedness  (including  the
performance of the obligations of the Mortgagor herein contained) until the full
and final payment or discharge of the Indebtedness,  and the Mortgagor is herein
and hereby bound and obligated not to sell or alienate the Mortgaged Property to
the prejudice of this act.

     The Mortgagor, in consideration of the premises and to induce the Agent and
the Lender Parties,  as the case may be, to make the Loans and issue the Letters
of Credit,  hereby  covenants and agrees with the Agent, for itself and as agent
for the Lender Parties, as follows:

                                   ARTICLE I

                              Indebtedness Secured
                              --------------------

     1.1 Items of Indebtedness  Secured. The following items of indebtedness are
secured hereby:

          (a) The Loan Notes (including future advances to be made thereunder by
     the Agent or the Lenders), the Letter of Credit Outstandings (as defined in
     the Credit  Agreements)  and all other  obligations  and liabilities of the
     Mortgagor under the Credit Agreements;

          (b) All indebtedness  and future advances  evidenced by any promissory
     notes  evidencing any  additional  loans which the Agent or the Lenders may
     from time to time make to the Mortgagor,  if any, the Agent and the Lenders
     not being obligated, however, to make such additional loans;

          (c) Any sums  advanced or  expenses or costs  incurred by the Agent or
     the Lender Parties, or by any keeper or receiver appointed hereunder, which
     are made or incurred  pursuant to, or permitted by, the terms hereof,  plus
     interest  thereon at the rate herein  specified or  otherwise  agreed upon,
     from the date of the advances or the  incurring  of such  expenses or costs
     until reimbursed;

          (d) Any and all other  indebtedness  of the Mortgagor or any Affiliate
     of the  Mortgagor to the Agent or any Lender Party now or hereafter  owing,
     whether  direct or indirect,  primary or  secondary,  fixed or  contingent,
     joint or several, regardless of how evidenced or arising, including without
     limitation, all Letters of Credit; and


                                      -12-


          (e) Any  extensions,  refinancings,  modifications  or renewals of all
     such indebtedness described in subparagraphs (a) through (d) above, whether
     or  not  the  Mortgagor   executes  any  extension   agreement  or  renewal
     instruments. The indebtedness secured hereby further continues with respect
     to any new obligation  arising from any novation  (subjective or objective)
     of the foregoing  indebtedness as permitted by Louisiana Civil Code Article
     1884.  Pursuant to Louisiana Revised Statutes 9:5390, this instrument shall
     automatically  secure payment of any renewal or  refinancing  note or notes
     delivered in substitution for or exchange of the note or notes then secured
     by this instrument evidencing any part of the Indebtedness.

     1.2 Indebtedness and the Notes Defined. All the above items of indebtedness
are hereinafter  collectively  referred to as the "Indebtedness." Any promissory
note evidencing any part of the Indebtedness, including, without limitation, any
of the  Loan  Notes,  is  hereinafter  referred  to as a  "Note,"  and all  such
promissory notes are hereinafter referred to collectively as the "Notes."

     1.3 Maximum  Amount.  The maximum  amount of the  Indebtedness  that may be
outstanding  at any time and from  time to time that  this  instrument  secures,
including without limitation as a mortgage and as a collateral  assignment,  and
including  without  limitation  any expenses,  advances or costs incurred by the
Agent and all other amounts included within the  Indebtedness,  is Three Billion
($3,000,000,000.00) dollars.

     1.4 No Paraph.  The  Mortgagor  and the Agent  acknowledge  that no Note or
other evidence of Indebtedness  has been paraphed for  identification  with this
instrument.

                                   ARTICLE II

                       Particular Covenants and Warranties
                       -----------------------------------
                                of the Mortgagor
                                ----------------

     2.1  Payment  of the  Indebtedness  and  Performance  of  Obligations.  The
Mortgagor will duly and punctually pay the Indebtedness,  as and when called for
in the Credit  Agreements  and the Security  Documents  and on or before the due
dates  thereof,  and will timely  perform and discharge  all of the  Obligations
(including each and every obligation owing on account of the Notes), in full and
on or before the dates same are to be performed and discharged.

     2.2 Certain  Representations and Warranties.  The Mortgagor  represents and
warrants  (and  with  respect  to  those  matters  set  forth  in the  following
subsections (b) and (f), as to those portions of the Mortgaged Property that are
operated by persons other than Mortgagor,  Mortgagor  makes such  representation
and warranty to the best of its knowledge) that


                                      -13-


          (a) the oil and gas  leases  described  in Exhibit A hereto are valid,
     subsisting  leases,  superior and paramount to all other oil and gas leases
     respecting the properties to which they pertain,

          (b) all producing  wells  located on the lands  described in Exhibit A
     (including  Exhibit  A-1) have  been  drilled,  operated  and  produced  in
     conformity with all Applicable Laws of all Governmental  Authorities having
     jurisdiction,   and  are  subject  to  no  penalties  on  account  of  past
     production,  and such wells are in fact  bottomed  under and are  producing
     from, and the well bores are wholly within,  the lands described in Exhibit
     A or lands pooled or unitized therewith,

          (c) the Mortgagor,  to the extent of the interest specified in Exhibit
     A  (including  Exhibit  A-1),  has  valid  and  indefeasible  title to each
     property right or interest constituting the Mortgaged Property described in
     Exhibit A  (including  Exhibit A-1) and has a good and legal right to grant
     and convey the same to the  Agent;  such  interest  entitles  Mortgagor  to
     receive  not  less  than the  share  of  Hydrocarbons  from  such  property
     indicated as its net revenue interest or "NRI" share of such  Hydrocarbons,
     and obligates Mortgagor to pay for not more than the share of operating and
     other  costs,  liabilities  and  expenses  associated  with  such  property
     indicated as its working interest or "WI" share of such costs,  liabilities
     and expenses,

          (d) the  Mortgaged  Property  is free from all  encumbrances  or liens
     whatsoever,  except for the Permitted  Encumbrances  or as permitted by the
     provisions of Section 2.4(e) hereof,

          (e) the Mortgagor is not obligated,  by virtue of any prepayment under
     any contract  providing for the sale by the Mortgagor of Hydrocarbons which
     contains  a "take or pay"  clause  or under  any  similar  arrangement,  to
     deliver  Hydrocarbons  at some  future  time  without  then  or  thereafter
     receiving full payment therefor,

          (f) the Mortgaged Property is currently being operated, maintained and
     developed,  in all material  respects,  in accordance  with all  applicable
     currently  existing  Permits,  Legal  Requirements  and all Applicable Laws
     (including, without limitation, Environmental Laws),

          (g) the cover page to this instrument  lists the correct legal name of
     the  Mortgagor  and the  Mortgagor  has not been  known by any  legal  name
     different  from the one set  forth on the  cover  page of this  instrument,
     except as set forth on Schedule I to this instrument;  the Mortgagor is not
     now and has not been known by any trade name,  nor has the  Mortgagor  been
     the subject of any merger or other corporate reorganization,

          (h) the  execution,  delivery and  performance by the Mortgagor of the
     Security Documents and the borrowing evidenced by the Notes, (i) are within
     the  Mortgagor's  corporate  powers  and have been duly  authorized  by the
     Mortgagor's


                                      -14-


     Board of Directors,  shareholders and all other requisite corporate action,
     (ii) have received all (if any) requisite prior  governmental  approval and
     consent in order to be legally  binding and  enforceable in accordance with
     the terms thereof,  and (iii) will not violate, be in conflict with, result
     in a breach or  constitute  (with due  notice or lapse of time,  or both) a
     default  under,  any  Legal  Requirement  or  result  in  the  creation  or
     imposition of any lien, charge or encumbrance of any nature whatsoever upon
     any of the  Mortgagor's  property or assets,  except as contemplated by the
     provisions of the Security Documents. The Security Documents constitute the
     legal, valid and binding  obligations of the Mortgagor and others obligated
     under  the  terms of the  Security  Documents,  in  accordance  with  their
     respective terms, and

          (i) there are no  actions,  suits or  proceedings  pending,  or to the
     knowledge of the Mortgagor  threatened,  against or affecting the Mortgagor
     or the  Mortgaged  Property  that  could  materially  adversely  affect the
     Mortgagor  or  the  Mortgaged  Property,   or  involving  the  validity  or
     enforceability of this instrument or the priority of the liens and security
     interests  created by the  Security  Documents,  and no event has  occurred
     (including specifically the Mortgagor's execution of the Security Documents
     and its consummation of the Loans described therein) which will violate, be
     in conflict with,  result in the breach of, or constitute  (with due notice
     or lapse of time, or both) a material default under, any Legal  Requirement
     or result in the creation or imposition of any lien,  charge or encumbrance
     of any nature  whatsoever upon any of the  Mortgagor's  property other than
     the liens and security interests created by the Security Documents.

     2.3 Further  Assurances.  The Mortgagor will warrant and forever defend the
Mortgaged  Property  unto the Agent  against  every person  whomsoever  lawfully
claiming the same or any part thereof,  subject to Permitted  Encumbrances,  and
Mortgagor  will  maintain and preserve  the lien and  security  interest  hereby
created so long as any of the  Indebtedness  remains unpaid.  The Mortgagor will
execute and deliver  such other and further  instruments  and will do such other
and further acts as, in the opinion of the Agent,  may be necessary or desirable
to carry  out more  effectually  the  purposes  of this  instrument,  including,
without limiting the generality of the foregoing,  (i) prompt  correction of any
defect which may hereafter be discovered in the title to the Mortgaged  Property
or in the  execution and  acknowledgment  of this  instrument,  any Note, or any
other document  executed in connection  herewith,  and (ii) prompt execution and
delivery of all notices to parties  operating,  purchasing or receiving proceeds
of production of  Hydrocarbons  from the  Mortgaged  Property,  and all division
orders or transfer orders,  any of which, in the opinion of the Agent, is needed
in order to transfer effectually or to assist in transferring effectually to the
Agent the assigned proceeds of production from the Mortgaged Property.

     2.4 Operation of the Mortgaged Property. So long as the Indebtedness or any
part thereof remains unpaid, and whether or not the Mortgagor is the operator of
any  particular  part of the Mortgaged  Property,  the Mortgagor  shall,  at the
Mortgagor's own expense:


                                      -15-


          (a) Do all things necessary to keep unimpaired the Mortgagor's  rights
     in the  Mortgaged  Property  and not,  except  in the  ordinary  course  of
     business,  abandon  any well or  forfeit,  surrender  or release  any Lease
     capable of producing  Hydrocarbons in paying quantities,  without the prior
     written consent of the Agent;

          (b) Obtain  and  maintain  all  required  Permits  and cause the lands
     described  in  Exhibit A to be  maintained,  developed,  protected  against
     drainage, and continuously operated for the production of Hydrocarbons in a
     good and workmanlike manner as would a prudent operator,  and in accordance
     with generally accepted industry practices, Joint Operating Agreements, and
     all Applicable Laws, excepting those being contested in good faith;

          (c) Duly  pay and  discharge,  or  cause  to be paid  and  discharged,
     promptly as and when due and payable,  all rentals and royalties (including
     shut-in  royalties) payable in respect of the Mortgaged  Property,  and all
     expenses  incurred in or arising from the operation or  development  of the
     Mortgaged  Property  not later  than the due date  thereof,  or the day any
     fine, penalty, interest or cost may be added thereto or imposed, or the day
     any lien may be filed, for the non-payment  thereof (if such day is used to
     determine the due date of the respective item);

          (d) Cause the  Operating  Equipment  to be kept in good and  effective
     operating  condition,  ordinary  wear and tear  excepted,  and all repairs,
     renewals,  replacements,  additions  and  improvements  thereof or thereto,
     needful to the  production  of  Hydrocarbons  from the lands  described  in
     Exhibit A, to be promptly made;

          (e) Not, without the prior written consent of the Agent, create, place
     or permit to be created or  placed,  or through  any act or failure to act,
     acquiesce in the placing of, or allow to remain, any mortgage, pledge, lien
     (statutory,  constitutional or contractual), security interest, encumbrance
     or  charge,  or  conditional  sale  or  other  title  retention  agreement,
     regardless  of whether same are expressly  subordinate  to the liens of the
     Security  Documents,  with  respect to all or any portion of the  Mortgaged
     Property, the Leases or the Rents and Revenues other than (1) the Permitted
     Encumbrances,  (2) Taxes  constituting a lien but not due and payable,  (3)
     defects or  irregularities  in title,  and liens,  charges or encumbrances,
     which,  in the Agent's  reasonable  opinion,  are not such as to  interfere
     materially  with the  development,  operation  or  value  of the  Mortgaged
     Property  and not such as to affect  materially  title  thereto,  (4) those
     being  contested  by the  Mortgagor  in good faith in such manner as not to
     jeopardize the Agent's rights in and to the Mortgaged  Property,  (5) those
     liens permitted by each Section 8.2.3 of each of the Credit Agreements, and
     (6) those consented to in writing by the Agent;

          (f) Carry with financially sound and reputable insurance companies and
     in amounts satisfactory to the Agent the following insurance: (1) workmen's
     compensation  insurance and public  liability and property damage insurance
     in


                                      -16-


     respect of all  activities  in which the  Mortgagor  might  incur  personal
     liability  for the death of or injury to an  employee or third  person,  or
     damage to or destruction of another's property;  and (2) to the extent such
     insurance is carried by similar companies  engaged in similar  undertakings
     in the same  general  areas in which the  Mortgaged  Property  is  located,
     insurance in respect of the Operating Equipment,  against loss or damage by
     fire, lightning, hail, tornado, explosion and other similar risks, hazards,
     casualties and contingencies  (including  business  interruption  insurance
     covering loss of Rents and Revenues); provided, that any such insurance may
     be provided by way of self  insurance to the extent that similar  companies
     engaged in similar undertakings in the same general areas also self-insure.
     Each insurance  policy issued in connection  therewith shall provide by way
     of  endorsements,  riders  or  otherwise  that (i) name the Agent as a loss
     payee on all property  insurance  policies and an additional insured on all
     liability insurance policies,  and provide that proceeds will be payable to
     the Agent as its interest may appear, which proceeds are hereby assigned to
     the Agent,  it being agreed by the Mortgagor  that such  payments  shall be
     applied A) if there be no event of default  existing  or which  would exist
     but for due notice or lapse of time, or both, to the restoration, repair or
     replacement  of the  Mortgaged  Property,  or B) if  there  be an  event of
     default existing, or which would exist but for due notice or lapse of time,
     or both, at the option of the Agent, either for the above stated purpose or
     toward the  payment of the  Indebtedness;  (ii) the  coverage  of the Agent
     shall not be  terminated,  reduced or affected in any manner  regardless of
     any breach or violation by the Mortgagor of any warranties, declarations or
     conditions  in  such  policy;  (iii)  no such  insurance  policy  shall  be
     canceled,  endorsed, altered or reissued to effect a change in coverage for
     any reason and to any extent  whatsoever  unless  such  insurer  shall have
     first given the Agent thirty (30) days prior written  notice  thereof;  and
     (iv) the Agent may, but shall not be obligated to, make premium payments to
     prevent any  cancellation,  endorsement,  alteration or reissuance and such
     payments  shall be accepted by the insurer to prevent same. The Agent shall
     be  furnished  with a  certificate  evidencing  such  coverage  in form and
     content  acceptable to the Agent.  All policies to be maintained under this
     instrument are to be issued on forms and by companies and with endorsements
     acceptable  to the Agent.  The  Mortgagor  shall  maintain  insurance in an
     amount sufficient to prevent the Mortgagor from becoming a co-insurer under
     any policy required hereunder. If the Mortgagor fails to maintain the level
     of insurance  required under this instrument,  then the Mortgagor shall and
     hereby agrees to indemnify  the Agent to the extent that a casualty  occurs
     and insurance  proceeds  would have been  available had such insurance been
     maintained;

          (g) Furnish to the Agent as soon as possible  and in any event  within
     five (5) days after the  occurrence  from time to time of any change in the
     address of the  Mortgagor's  location (as described on the  signature  page
     hereto) or in the name of the Mortgagor, notice in writing of such change;


                                      -17-


          (h) Not initiate or acquiesce in any change in any material  zoning or
     other land use or Water  Rights  classification  now or hereafter in effect
     and affecting the Mortgaged Property or any part thereof;

          (i) Notify the Agent in writing as soon as  possible  and in any event
     within five (5) days after it shall become aware of the  occurrence  of any
     event of default  under  Section 4.1 or any event which,  with notice,  the
     passage of time or both would be such an event of default;

          (j) Appear and defend,  with  counsel  acceptable  to the Agent in its
     reasonable  discretion,  and hold the  Agent  harmless  from,  any  action,
     proceeding  or claim  affecting  the  Mortgaged  Property or the rights and
     powers  of the  Agent  under  the  Security  Documents,  and all  costs and
     expenses  incurred by the Agent in protecting  its  interests  hereunder in
     such an event  (including  all court  costs and  attorneys'  fees) shall be
     borne by the Mortgagor;  provided, that such defense: (1) shall be provided
     by a lawyer or law firm listed on a schedule  delivered  to and approved in
     writing by the Agent, from time to time (the "Approved Counsel List"),  and
     (2) if the amount in controversy in such action,  proceeding or claim is in
     excess of $2,500,000 in actual or  compensatory  damages and/or  liquidated
     damages  (or is  reasonably  believed  to exceed  such amount if the demand
     involves  unliquidated  damages),  such law firm shall be  approved  by the
     Agent, in its reasonable discretion, for that particular action, proceeding
     or claim. As to actions,  proceedings or claims  involving a portion of the
     Mortgaged  Property in which  Mortgagor or a Subsidiary of Mortgagor is not
     the operator and with respect to which  Mortgagor  does not have a majority
     net revenue interest and/or working  interest,  Mortgagor may elect, in its
     reasonable  judgment,  to allow counsel for the operator to appear for, and
     defend Mortgagor in such matter, in which case, selection of counsel by the
     operator  shall  not be  governed  by this  Section  2.4 (j);  and  further
     provided,  that  nothing  herein  shall  restrict or limit the right of the
     Agent or the  Lenders  to select its or their own  counsel  to  defend,  at
     Mortgagor's cost and expense,  any action  proceeding or claim in which any
     of them are named as parties;

          (k) Subject to the Mortgagor's right to contest the same, promptly pay
     all Taxes  legally  imposed  upon  this  instrument  or upon the  Mortgaged
     Property or upon the income and profits  thereof,  or upon the  interest of
     the Agent or the other Lender Parties therein;  provided that the Mortgagor
     shall not be liable for taxes  accruing  after a transfer of the  Mortgaged
     Property following a foreclosure;

          (l) Comply with,  conform to and obey, in all material  respects,  all
     present  and future  Legal  Requirements  and not use,  maintain,  operate,
     occupy,  or allow the use,  maintenance,  operation  or  occupancy  of, the
     Mortgaged  Property in any manner which (a) violates any present and future
     Legal  Requirement,  (b) may be dangerous unless safeguarded as required by
     Applicable Law, (c)  constitutes a public or private  nuisance or (d) makes
     void,  voidable or  cancelable,  or increases the premium of, any insurance
     then in force with respect thereto; and


                                      -18-


          (m) Not, without the prior written consent of the Agent, permit any of
     the  Fixtures  or  Personalty  to be  removed  at any time  from the  lands
     described in Exhibit A unless (i) the removed  item is removed  temporarily
     for maintenance and repair, (ii) if removed permanently,  is replaced by an
     article of equal  suitability and value,  owned by the Mortgagor,  free and
     clear of any lien or security interest except such as may be first approved
     in writing by the Agent or (iii) such Fixtures or Personalty are removed in
     connection  with the plugging and  abandoning of wells,  or  abandonment of
     other facilities, in each case as permitted by this Mortgage.

     2.5  Performance  of Leases.  The Mortgagor  will:  (a) duly and punctually
perform and comply with any and all representations,  warranties,  covenants and
agreements  expressed  as  binding  upon it under  each of the  Leases;  (b) not
voluntarily  terminate,  cancel or waive its  rights or the  obligations  of any
other party under any of the Leases;  (c) use all reasonable efforts to maintain
each of the Leases in force and effect  during  the full term  thereof;  and (d)
appear in and defend (or cause its  operator to appear in and defend) any action
or proceeding arising under or in any manner connected with any of the Leases or
the  representations,  warranties,  covenants and  agreements of it or the other
party or parties thereto.

     2.6 Recording,  etc. The Mortgagor will  promptly,  and at the  Mortgagor's
expense, record,  register,  deposit and file this and every other instrument in
addition or supplemental hereto in such offices and places and at such times and
as often  as may be  necessary  to  preserve,  protect  and  renew  the lien and
security  interest  hereof  as a first  lien  on and  prior  perfected  security
interest  in real or personal  property,  as the case may be, and the rights and
remedies of the Agent and of the other Lender Parties, and otherwise will do and
observe all things or matters  necessary  or expedient to be done or observed by
reason  of  any  Applicable  Law,  for  the  purpose  of  effectively  creating,
maintaining  and preserving the lien and security  interest hereof on and in the
Mortgaged Property.

     2.7 Sale or Mortgage of the Mortgaged Property.  Except (a) as set forth in
Section 6.1 of this instrument;  (b) as permitted by each Section 8.2.10 of each
of the Credit Agreements;  (c) for sales of severed Hydrocarbons in the ordinary
course of the  Mortgagor's  business;  (d) sales of or  dispositions of surplus,
obsolete or worn inventory or equipment;  and (e) the lien and security interest
created by this  instrument,  the  Mortgagor  will not sell,  convey,  mortgage,
pledge,  hypothecate,  pool,  unitize or  otherwise  dispose of or encumber  the
Mortgaged  Property nor any portion thereof,  nor any of the Mortgagor's  right,
title or interest  therein,  without first  securing the written  consent of the
Agent;  and the  Mortgagor  will not  enter  into any  arrangement  with any gas
pipeline  company or other  consumer of  Hydrocarbons  regarding  the  Mortgaged
Property  whereby  said gas  pipeline  company or consumer may set off any claim
against the  Mortgagor  by  withholding  payment for any  Hydrocarbons  actually
delivered.

     2.8 Records,  Statements and Reports.  The Mortgagor will keep proper books
of record and account in which complete and correct  entries will be made of the
Mortgagor's  transactions  in  accordance  with  generally  accepted  accounting
principles


                                      -19-


and  will  furnish  or cause  to be  furnished  to the  Agent  such  information
concerning the business, affairs and financial condition of the Mortgagor as the
Agent may from time to time reasonably request.  Without limiting the generality
of the foregoing,  the Mortgagor  shall furnish to the Agent,  upon its request,
but not more than every six (6) months,  (a) reports  prepared by an independent
petroleum  engineer  acceptable  to the Agent  concerning  (1) the  quantity  of
Hydrocarbons  recoverable from the Mortgaged Property,  (2) the projected income
and expense  attributable to the Mortgaged  Property,  and (3) the expediency of
any change in methods of treatment  or operation of all or any wells  productive
of  Hydrocarbons,  any new  drilling  or  development,  any method of  secondary
recovery by repressuring  or otherwise,  or any other action with respect to the
Mortgaged Property, the decision as to which may increase or reduce the quantity
of Hydrocarbons  ultimately  recoverable or the rate of production thereof,  and
(b) reports for the prior  period  showing the gross  proceeds  from the sale of
Hydrocarbons  produced  from the lands  described  in Exhibit A  (including  any
thereof  taken by the Mortgagor for the  Mortgagor's  own use),  the quantity of
such  Hydrocarbons  sold,  the  severance,  gross  production,   occupation,  or
gathering taxes deducted from or paid out of such proceeds,  the number of wells
operated,  drilled or  abandoned,  and such other  information  as the Agent may
reasonably  request  (upon  request of the Agent,  such  reports  referred to in
clauses  (a) and (b) above shall set forth such  information  on a lease or unit
basis,  and after the  occurrence  of an Event of Default,  and upon the Agent's
request,  Mortgagor  shall  deliver  the  reports  described  in clause (b) on a
monthly basis).

     2.9 Right of Entry.

          (a) Upon at least twenty-four (24) hours notice to the Mortgagor,  the
     Mortgagor will permit the Agent, or its agents,  at the cost and expense of
     the Mortgagor,  to enter upon the Mortgaged Property and all parts thereof,
     for the purpose of investigating and inspecting the condition and operation
     thereof,  and shall permit reasonable access to the field offices and other
     offices (to the fullest  extent that Mortgagor may do so under the terms of
     the applicable Joint Operating  Agreements and other applicable  agreements
     affecting  the  Mortgaged  Property),  including  the  principal  place  of
     business,  of the Mortgagor to inspect and examine the  Mortgaged  Property
     and to inspect,  review and  reproduce  as  necessary  any books,  records,
     accounts, contracts or other documents of the Mortgagor.

          (b) Without limiting the generality of the foregoing,  the Agent shall
     have the right (to the fullest  extent that  Mortgagor  may do so under the
     terms of the applicable  Joint  Operating  Agreements and other  applicable
     agreements  affecting the Mortgaged  Property),  on twenty-four  (24) hours
     prior  notice to the  Mortgagor,  to cause such persons and entities as the
     Agent may designate to enter the Mortgaged Property to conduct (at the cost
     and expense of the Mortgagor), or to cause the Mortgagor to conduct (at the
     cost and expense of the Mortgagor),  such tests and  investigations  as the
     Agent deems necessary to determine whether any hazardous materials or solid
     waste is being generated, transported, stored, or disposed of in accordance
     with applicable Environmental


                                      -20-


     Laws.  Such  tests and  investigations  may  include,  without  limitation,
     underground  borings,  ground  water  analyses and borings from the floors,
     ceilings and walls of any improvements  located on the Mortgaged  Property.
     This Section 2.9 shall not be construed to affect or limit the  obligations
     of the Mortgagor pursuant to Section 2.4 hereof.

          (c) The Agent  shall  have no duty to visit or observe  the  Mortgaged
     Property, or to conduct tests, and no site visit, observation or testing by
     the Agent (or its  agents and  independent  contractors)  shall  impose any
     liability on the Agent or any other Lender  Party,  nor shall the Mortgagor
     or any other  obligor  be  entitled  to rely on any visit,  observation  or
     testing  by the Agent in any  respect.  The Agent may,  in its  discretion,
     disclose to the Mortgagor or any other Person,  including any  Governmental
     Authority,  any  report or finding  made as a result  of, or in  connection
     with, any site visit,  observation  or testing by the Agent.  the Mortgagor
     agrees that the Agent makes no warranty or  representation to the Mortgagor
     or any other obligor  regarding the truth,  accuracy or completeness of any
     such  report or  findings  that may be so  disclosed.  The  Mortgagor  also
     acknowledges   that,   depending  upon  the  results  of  any  site  visit,
     observation  or testing by the Agent and  disclosed to the  Mortgagor,  the
     Mortgagor may have a legal  obligation  to notify one or more  Governmental
     Authorities  of  such  results,   that  such  reporting   requirements  are
     site-specific,  and are to be evaluated by the Mortgagor  without advice or
     assistance from the Agent.

     2.10  Taxes.  Subject to the  Mortgagor's  right to contest  the same,  the
Mortgagor  will promptly pay all taxes,  assessments  and  governmental  charges
legally imposed upon this instrument or upon the Mortgaged Property, or upon the
interest of the Agent therein, or upon the income and profits thereof.

     2.11 No Governmental Approvals.  The Mortgagor represents and warrants that
(a) no approval or consent of any  regulatory  or  administrative  commission or
authority,  or of any other  governmental  body,  is necessary to authorize  the
execution and delivery of this  instrument or of the Notes,  or to authorize the
observance or  performance  by the  Mortgagor of the covenants  herein or in the
Notes  contained,  or that such  approvals as are required have been obtained or
will be obtained  promptly and (b) the  Mortgagor has obtained all Permits which
are necessary for the operation of the Mortgaged Property.

     2.12 Environmental Laws. The Mortgagor represents and warrants, to the best
of its knowledge after due inquiry, and except as set forth in each Item 7.12 of
the  Disclosure  Schedule  (including  Part B thereof)  attached  to each of the
Credit  Agreements,  that:  the  Mortgaged  Property is in  compliance  with all
applicable  Environmental Laws; there are no conditions existing currently which
would be likely to subject  the  Mortgagor  to  damages,  penalties,  injunctive
relief or cleanup costs under any Environmental Laws or assertions  thereof,  or
which  require or are likely to require  cleanup,  removal,  remedial  action or
other response pursuant to Environmental Laws by the Mortgagor; the Mortgagor is
not a party to any litigation or  administrative  proceedings,  nor so far as is
known by the Mortgagor is any litigation or administrative proceeding threatened
against it, which asserts or alleges that the Mortgagor has


                                      -21-


violated or is violating Environmental Laws or that the Mortgagor is required to
clean  up,  remove  or take  remedial  or  other  responsive  action  due to the
disposal,  depositing,  discharge,  leaking or other  release  of any  hazardous
substances  or materials;  neither the  Mortgaged  Property nor the Mortgagor is
subject to any judgment,  decree, order or citation related to or arising out of
Environmental  Laws and  neither  has  been  named or  listed  as a  potentially
responsible  party by any governmental  body or agency in a matter arising under
any Environmental Laws. The Mortgagor has also obtained all permits, licenses or
approvals  required under applicable  Environmental Laws which are necessary for
its current  exploration,  use,  and  development  activities  at the  Mortgaged
Property;  and to the Mortgagor's  knowledge after reasonable  investigation all
use, generation, manufacturing, release, discharge, storage, deposit, treatment,
recycling or disposal of any materials on, under or at the Mortgaged Property or
transported  to or from the  Mortgaged  Property  (or tanks or other  facilities
thereon containing such materials) are being and will be conducted in accordance
with applicable  Environmental Laws including without limitation those requiring
cleanup, removal or any other remedial action.

     2.13 Corporate Mortgagor.  The Mortgagor will continue to be duly qualified
to transact business in each state where the conduct of its business requires it
to be qualified,  and will not,  without the prior written consent of the Agent,
consolidate or merge with any other partnership,  company,  corporation or other
Person.

     2.14  Taxpayer  I.D.  Number.  The  taxpayer  identification  number of the
Mortgagor  is  77-0212977.  The taxpayer  identification  number of the Agent is
13-494-1099.

                                  ARTICLE III

                            Assignment of Production
                            ------------------------

     3.1 Assignment.

          (a) The Mortgagor hereby transfers,  assigns,  warrants and conveys to
     the Agent,  effective  as of May 1, 2002,  at 7:00 A.M.,  local  time,  all
     Hydrocarbons  which are  thereafter  produced  from and which accrue to the
     Mortgaged  Property,  and all proceeds  therefrom.  Subject to the terms of
     Section  3.1(b),  all parties  producing,  purchasing or receiving any such
     Hydrocarbons,  or having such, or proceeds  therefrom,  in their possession
     for which  they or  others  are  accountable  to the Agent by virtue of the
     provisions  of this Article III, are  authorized  and directed to treat and
     regard  the Agent as the  assignee  and  transferee  of the  Mortgagor  and
     entitled in the  Mortgagor's  place and stead to receive such  Hydrocarbons
     and all  proceeds  therefrom;  and said  parties  and each of them shall be
     fully  protected in so treating and  regarding the Agent and shall be under
     no obligation to see to the  application  by the Agent of any such proceeds
     or payments received by it; provided,  however, that, until the Agent shall
     have  instructed  such parties that an Event of Default has occurred and to
     deliver such Hydrocarbons and all proceeds therefrom directly to the Agent,
     such parties shall


                                      -22-


     be  entitled  to  deliver  such  Hydrocarbons  and all  proceeds  therefrom
     directly  to the  Mortgagor.  So long as no Event  of  Default  shall  have
     occurred,  the Agent  agrees  that  Mortgagor  shall be entitled to receive
     directly from such parties, and keep and retain, all such proceeds from the
     sale of such Hydrocarbons.

          (b) Upon the  occurrence  of an Event of Default (it being  understood
     that the  determination  of the  occurrence  of an Event of  Default by the
     Agent  shall be  conclusive  and  binding  as to all such  parties  for all
     purposes  hereof  and  that,  at the  time  the  Agent  gives  the  initial
     instruction  and notice under this Article III, such Event of Default shall
     be then continuing) said Hydrocarbons and products are to be delivered into
     pipelines  connected  with  the  oil and gas  leases,  or to the  purchaser
     thereof,  free and clear of all Taxes,  and the  proceeds  from the sale of
     such  Hydrocarbons  paid in accordance with Section 3.5 of this instrument.
     The  Mortgagor  agrees to perform  all such acts,  and to execute  all such
     further  assignments,  transfers and division orders, and other instruments
     as may be  required  or  desired by the Agent or any party in order to have
     said  revenues and proceeds so paid to the Agent,  as and when  provided in
     this  Article III.  With  respect to any funds  received by the Agent after
     notice of an Event of Default shall have been given under this Article III,
     the Agent is fully  authorized  to receive  and give  receipt  for any such
     revenues and proceeds  that are received by the Agent;  to endorse and cash
     any and all checks and drafts  payable to the order of the Mortgagor or the
     Agent for the account of the Mortgagor  received from or in connection with
     said revenues or proceeds and apply the proceeds thereof in accordance with
     Section 3.2 hereof, and to execute transfer and division orders in the name
     of the Mortgagor, or otherwise, with warranties binding the Mortgagor.

     3.2 Application of Proceeds. All payments received by the Agent pursuant to
Section 3.1 hereof shall be placed in a cash collateral account at the Agent and
on the last business day of each calendar month applied as follows:

          First:  To the  payment  and  satisfaction  of all costs and  expenses
     incurred in connection  with the  collection of such  proceeds,  and to the
     payment of all items of the  Indebtedness and the Obligations not evidenced
     by any Note.

          Second:  To the payment of the  interest  on the Notes  accrued to the
     date of such payment.

          Third:  To the payment of the amounts of principal  then due and owing
     on the Notes.

          Fourth:  The  balance,  if any,  shall  either be  applied on the then
     unmatured principal amounts of the Notes, such application to be on such of
     the Notes and  installments  thereof  as the Agent may  select,  or, at the
     option of the Agent, released to the Mortgagor.


                                      -23-


     3.3 No Liability of the Agent in Collecting.  The Agent is hereby  absolved
from all liability for failure to enforce collection of any proceeds so assigned
(and no such  failure  shall be  deemed to be a waiver of any right of the Agent
under this Article) and from all other  responsibility in connection  therewith,
except  the  responsibility  to  account  to the  Mortgagor  for funds  actually
received.

     3.4  Assignment  Not a Restriction  on the Agent's  Rights.  Nothing herein
contained  shall detract from or limit the absolute  obligation of the Mortgagor
to make payment of the Indebtedness  regardless of whether the proceeds assigned
by this  Article  are  sufficient  to pay the same,  and the  rights  under this
Article shall be in addition to all other security now or hereafter  existing to
secure the payment of the Indebtedness.

     3.5 Status of  Assignment.  Notwithstanding  the other  provisions  of this
Article and in addition to the other rights hereunder, the Agent or any receiver
or  keeper  appointed  in  judicial  proceedings  for  the  enforcement  of this
instrument  shall  have the  right to  receive  all of the  Hydrocarbons  herein
assigned  and the  proceeds  therefrom  after  the  occurrence  and  during  the
continuance  of any Event of Default and, in any event,  after any Note or other
item of  Indebtedness  has been declared due and payable in accordance  with the
provisions  of Section 4.1 hereof and to apply all of said  proceeds as provided
in Section  3.2  hereof.  Upon any sale of the  Mortgaged  Property  or any part
thereof  pursuant to Article V, the  Hydrocarbons  thereafter  produced from the
property so sold, and the proceeds therefrom, shall be included in such sale and
shall pass to the purchaser free and clear of the  assignment  contained in this
Article.

     3.6 Indemnification  Obligations.  The following provisions shall apply to,
and be deemed in each case to modify,  each of the provisions of this instrument
(except those set forth in Sections 2.12 and 6.11 hereof) and the other Security
Documents  (except to the extent otherwise  expressly  provided therein) wherein
the Mortgagor is obligated to indemnify each of the Indemnified Persons:

          (a)  Mortgagor  agrees to  indemnify  the Agent  against all legal and
     administrative  proceedings  for which a claim for  indemnification  may be
     made   by   the   Indemnified   Person   (herein,   collectively,    called
     "Indemnification  Claims")  made against or incurred by them or any of them
     as a consequence  of the  assertion,  either before or after the payment in
     full of the  Indebtedness,  that they or any of them received  Hydrocarbons
     herein  assigned or the proceeds  thereof  claimed by third persons and the
     Agent  shall  have the right to  defend  against  any such  Indemnification
     Claims,  employing attorneys therefor, and unless furnished with reasonable
     indemnity,  they or any of them shall  have the right to pay or  compromise
     and adjust all such  Indemnification  Claims.  The Mortgagor will indemnify
     and pay to the Agent  any and all such  amounts  as may be paid in  respect
     thereof  or  as  may  be  successfully  adjudged  against  the  Agent.  The
     obligations of the Mortgagor as  hereinabove  set forth in this Section 3.6
     shall survive the release  termination,  foreclosure  or assignment of this
     instrument or any sale hereunder.


                                      -24-


          (b) The Mortgagor  shall pay when due any judgments with respect to an
     Indemnification  Claim against any of the Indemnified Persons and which are
     rendered  by a final order or decree of a court of  competent  jurisdiction
     from  which no further  appeal  may be taken or has been  taken  within the
     applicable  appeal period.  In the event that such payment is not made, any
     of the  Indemnified  Persons  at its  sole  discretion  may  pay  any  such
     judgments, in whole or in part, and look to the Mortgagor for reimbursement
     pursuant  to this  instrument,  or may  proceed  to file suit  against  the
     Mortgagor to compel such payment.

          (c) Any amount  which the  Mortgagor is obligated to pay to or for the
     benefit of an Indemnified Person with respect to an Indemnification  Claim,
     but which is not paid when due,  shall bear interest at the default or post
     maturity  rate of  interest  provided  for in the Note  from the date  such
     amount is due until such amount is paid.

                                   ARTICLE IV

                                Events of Default
                                -----------------

     4.1 Events of Default  Hereunder.  In case any one or more of the following
"events of default" shall occur and shall not have been remedied:

          (a) default in the payment of principal of or interest on any Note, or
     in the  payment  of  any  other  Indebtedness  or in  the  performance  and
     discharge of the Obligations secured hereby, when due;

          (b) the  occurrence of an event of default (other than any relating to
     non-payment  of  principal  of or interest on any Note) under the terms and
     provisions of either Credit  Agreement and the continuance of such event of
     default for the applicable period of grace, if any;

          (c) any  warranty or  representation  made by  Mortgagor  herein shall
     prove to be untrue in any  material  respect  as of the date made or deemed
     made; or

          (d) failure by Mortgagor,  within the applicable  period of grace,  if
     any, to cure a default in the due performance or observance of any covenant
     or agreement contained in this instrument and not constituting a default in
     the payment of principal of or interest  upon any Note or in the payment of
     any other Indebtedness;

then and in any such event the Agent,  at its  option,  may  declare  the entire
unpaid  principal  of and the  interest  accrued  on the  Notes  and  all  other
Indebtedness secured hereby to be forthwith due and payable,  without any notice
or demand of any kind, both of which are hereby expressly waived.


                                      -25-


                                   ARTICLE V

                           Enforcement of the Security
                           ---------------------------

     5.1 Rights of the Agent with Respect to Personal  Property  Constituting  a
Part of the Mortgaged  Property.  Upon the occurrence of an event of default and
if such event shall be  continuing,  the Agent will have all rights and remedies
granted by law, and particularly by the Uniform Commercial Code, including,  but
not  limited  to,  the  right  to  take  possession  of  all  personal  property
constituting  a part of the Mortgaged  Property,  and for this purpose the Agent
may enter upon any  premises  on which any or all of such  personal  property is
situated  and take  possession  of and operate  such  personal  property (or any
portion thereof) or remove it therefrom.  The Agent may require the Mortgagor to
assemble such personal property and make it available to the Agent at a place to
be designated by the Agent which is reasonably convenient to all parties. Unless
such personal  property is perishable or threatens to decline  speedily in value
or is of a type customarily sold on a recognized market, the Agent will give the
Mortgagor  reasonable  notice of the time and place of any public sale or of the
time after which any private sale or other disposition of such personal property
is to be made. This requirement of sending  reasonable notice will be met if the
notice is mailed by first-class mail,  postage prepaid,  to the Mortgagor at the
address shown below the  signatures at the end of this  instrument at least five
(5) days before the time of the sale or disposition.  Further,  Agent shall have
the right to utilize executory  process,  as more fully set forth in Section 5.4
hereof and the right to  appointment  of a keeper,  as set forth in Section  5.3
hereof.

     5.2 Rights of the Agent with Respect to Fixtures Constituting a Part of the
Mortgaged Property. Upon the occurrence of an event of default and if such event
shall be  continuing,  the Agent may elect to treat the fixtures  constituting a
part of the Mortgaged  Property as either real  property  collateral or personal
property  collateral  and then proceed to exercise  such rights as apply to such
type of collateral.

     5.3 Judicial Proceedings. Upon the occurrence of an event of default and if
such event shall be  continuing,  the Agent may proceed by a suit or suits for a
foreclosure hereunder for cash or upon credit in one or more parcels or portions
under  executory  or ordinary  process,  at the  Agent's  sole  option,  without
appraisement,   appraisement   being  expressly  waived,  or  for  the  specific
performance  of any  covenant or  agreement  herein  contained  or in aid of the
execution of any power herein  granted,  or for the  appointment  of a keeper or
receiver  pending  any  foreclosure  hereunder  or the  sale  of  the  Mortgaged
Property,  or for the  enforcement of any other  appropriate  legal or equitable
remedy.

     5.4 Other Remedies.  The Mortgagor  hereby  acknowledges  the  Indebtedness
secured hereby, whether now existing or to arise hereafter, and, for the purpose
of  foreclosure  under  Louisiana's  executory  process  procedures,   confesses
judgment  thereon in the full amount of the  Indebtedness  in favor of the Agent
and any future holder or holders of the Indebtedness if such obligations are not
paid at  maturity.  The  Mortgagor in  accordance  with the terms hereof and the
Credit Agreements does by


                                      -26-


these  presents  consent,  agree and stipulate  that,  upon the occurrence of an
event of default  hereunder or under either Credit  Agreement,  the Agent or any
future holder or holders of any of the  Indebtedness,  at its (or their) option,
without making demand and without  notice or putting in default,  the same being
hereby  expressly  waived,  cause all and singular the property of the Mortgagor
herein  mortgaged  to be  seized  and sold by  executory  process  issued by any
competent  court,  or to proceed with the  enforcement  of this  instrument  and
pledge of  production  in any manner  prescribed  by law, the  Mortgagor  hereby
waiving  notice of demand or delay  stipulated  in  Article  2639 of the Code of
Civil  Procedure  of  Louisiana  and the benefit of any laws,  or parts of laws,
relating to the  appraisement  of the property  seized and sold under  executory
process or other legal  process,  and  consenting  that the  Mortgaged  Property
situated in the State of Louisiana be sold without  appraisement  to the highest
bidder for cash.

     5.5 Certain Aspects of a Sale. The Agent shall have the right to become the
purchaser  at any sale held by any court,  receiver or public  officer,  and the
Agent  shall have the right to credit  upon the amount of the bid made  therefor
the  amount  payable  out of the  net  proceeds  of such  sale  to it.  Recitals
contained in any  conveyance  made to any  purchaser at any sale made  hereunder
shall  conclusively  establish  the truth and  accuracy of the  matters  therein
stated, including, without limiting the generality of the foregoing,  nonpayment
of the unpaid  principal sum of, and the interest  accrued on, the Notes,  after
the same have become due and payable,  advertisement and conduct of such sale in
the manner provided herein.

     5.6 Receipt to Purchaser.  Upon any sale, the receipt of the officer making
sale under judicial proceedings,  shall be sufficient discharge to the purchaser
or purchasers at any sale for his or their purchase money, and such purchaser or
purchasers,  or his or their  assigns or  personal  representatives,  shall not,
after  paying such  purchase  money and  receiving  such receipt of such officer
therefor,  be obliged to see to the application of such purchase money, or be in
anywise answerable for any loss, misapplication or nonapplication thereof.

     5.7  Effect  of Sale.  Any sale or sales of the  Mortgaged  Property  shall
operate to divest all right, title, interest, claim and demand whatsoever either
at law or in  equity,  of the  Mortgagor  of,  in and to the  premises  and  the
property sold, and shall be a perpetual bar, both at law and in equity,  against
the Mortgagor,  and the Mortgagor's  successors or assigns,  and against any and
all persons  claiming or who shall  thereafter  claim all or any of the property
sold from,  through or under the  Mortgagor  or the  Mortgagor's  successors  or
assigns.  Nevertheless, the Mortgagor, if requested by the Agent so to do, shall
join in the execution and delivery of all proper  conveyances,  assignments  and
transfers of the properties so sold.

     5.8  Application  of Proceeds.  The  proceeds of any sale of the  Mortgaged
Property,  or any part thereof,  whether under the power of sale herein  granted
and conferred or by virtue of judicial proceedings, shall be applied as follows:

          First:  To the  payment  and  satisfaction  of all costs and  expenses
     incurred by the Agent in such proceedings  including,  without limiting the
     generality of the


                                      -27-


     foregoing,  a  commission  of five percent (5%) to the keeper and costs and
     expenses  of  any  entry,  or  taking  of  possession,   of  any  sale,  or
     advertisement  thereof,  and of  conveyances,  and as  well,  court  costs,
     compensation of agents and employees and legal fees.

          Second:  To the payment of the  interest  on the Notes  accrued to the
     date of such payment.

          Third:  To the payment of the amounts of principal of the Notes and of
     the other items of Indebtedness due and owing at the time of such payment.

          Fourth:  Any  surplus  thereafter  remaining  shall  be  paid  to  the
     Mortgagor or the  Mortgagor's  successors  or assigns,  as their  interests
     shall appear.

     5.9 The Mortgagor's  Waiver of Appraisement,  Marshalling and Other Rights.
The  Mortgagor  agrees,  to the full extent that the  Mortgagor  may lawfully so
agree,  that the  Mortgagor  will not at any time insist upon or plead or in any
manner  whatever  claim  the  benefit  of  any  appraisement,  valuation,  stay,
extension or  redemption  law now or hereafter in force,  in order to prevent or
hinder the enforcement or foreclosure of this instrument or the absolute sale of
the Mortgaged  Property or the  possession  thereof by any purchaser at any sale
made pursuant to any provision hereof, or pursuant to the decree of any court of
competent  jurisdiction;  but the  Mortgagor,  for the Mortgagor and all who may
claim through or under the Mortgagor,  so far as the Mortgagor or those claiming
through or under the Mortgagor now or hereafter  lawfully may, hereby waives the
benefit of all such laws. The Mortgagor, for the Mortgagor and all who may claim
through or under the  Mortgagor,  waives,  to the extent that the  Mortgagor may
lawfully do so, any and all right to have the Mortgaged Property marshalled upon
any foreclosure of the lien hereof, or sold in inverse order of alienation,  and
agrees that the Agent or any court having  jurisdiction  to foreclose  such lien
may sell the Mortgaged Property as an entirety. The Mortgagor, for the Mortgagor
and all who may claim through or under the  Mortgagor,  further  waives,  to the
full extent that the Mortgagor may lawfully do so, any requirement for posting a
receiver's  bond or  replevin  bond or other  similar  type of bond if the Agent
commence an action for  appointment  of a receiver or an action for  replevin to
recover  possession  of any of  the  Mortgaged  Property.  If  any  law in  this
paragraph  referred  to  and  now  in  force,  of  which  the  Mortgagor  or the
Mortgagor's  successor or successors might take advantage despite the provisions
hereof,  shall hereafter be repealed or cease to be in force, such law shall not
thereafter be deemed to constitute any part of the contract herein  contained or
to preclude the operation or application of the provisions of this paragraph. If
the Mortgagor is an individual,  the Mortgagor waives and releases all rights of
dower,  courtesy and homestead in the Mortgaged  Property insofar as such rights
may in any way affect the purposes of this instrument.

     5.10 Costs and Expenses. All costs and expenses (including attorneys' fees)
incurred by the Agent in protecting  and enforcing  its rights  hereunder  shall
constitute a demand  obligation  owing by the  Mortgagor to the party  incurring
such costs and expenses  and shall draw  interest at an annual rate equal to the
highest rate of interest


                                      -28-


from time to time  accruing on the Loan Note plus three percent (3%) until paid,
all of which shall constitute a portion of the Indebtedness.

     5.11 Operation of the Mortgaged  Property by the Agent. Upon the occurrence
of an event of default and in addition to all other rights  herein  conferred on
the Agent,  the Agent (or any  person,  firm or  corporation  designated  by the
Agent) shall have the right and power, but shall not be obligated, to enter upon
and  take  possession  of any of the  Mortgaged  Property,  and to  exclude  the
Mortgagor,  and the Mortgagor's  agents or servants,  wholly  therefrom,  and to
hold,  use,  administer,  manage and  operate  the same to the  extent  that the
Mortgagor  shall be at the time entitled and in its place and stead.  The Agent,
or any person, firm or corporation designated by the Agent, may operate the same
without any  liability to the  Mortgagor  in  connection  with such  operations,
except to use ordinary care in the operation of such  properties,  and the Agent
or any person, firm or corporation designated by the Agent, shall have the right
to collect, receive and receipt for all Hydrocarbons produced and sold from said
properties, to make repairs, purchase machinery and equipment, conduct work-over
operations,  drill  additional  wells and to  exercise  every  power,  right and
privilege of the Mortgagor with respect to the Mortgaged  Property.  When and if
the expenses of such operation and development  (including costs of unsuccessful
work-over  operations or additional  wells) have been paid and the  Indebtedness
paid,  said  properties  shall,  if there  has been no sale or  foreclosure,  be
returned  to the  Mortgagor.  Further,  in the event  that any of the  Mortgaged
Property  is  seized as an  incident  to an action  for the  recognition  or the
enforcement of this instrument,  whether by executory process, ordinary process,
writ of fieri facias,  sequestration,  or otherwise, the court issuing the order
under which the seizure is to be effected shall, if such order is petitioned for
by the holder or holders of the Notes or other Indebtedness,  direct the sheriff
or other  officer  making the  seizure  to  appoint  as keeper of the  Mortgaged
Property,  in accordance  with Louisiana  Revised  Statutes  9:5131 through 5135
and/or 9:5136 through 5140.2, as the same may be amended,  such person as may be
named by the Agent at the time the seizure is effected.

                                   ARTICLE VI

                            Miscellaneous Provisions
                            ------------------------

     6.1 Pooling and  Unitization.  The Mortgagor  shall have the right,  and is
hereby  authorized,  to  pool or  unitize  all or any  part of any of the  lands
described  in Exhibit A,  insofar as  relates to the  Mortgaged  Property,  with
adjacent lands, leaseholds and other interests, when, in the reasonable judgment
of the  Mortgagor,  it is  necessary  or  advisable  to do so in order to form a
drilling and/or  production  unit to facilitate the orderly  development of that
part  of  the  Mortgaged  Property  affected  thereby,  or to  comply  with  the
requirements of any Applicable Law or governmental order or regulation  relating
to the spacing of wells or  proration  of the  production  therefrom;  provided,
however,  that  any  unit  so  formed  for  the  production  of  oil  shall  not
substantially exceed 160 acres, and any unit so formed for the production of gas
shall not  substantially  exceed 640 acres,  unless a larger area is required to
conform to an Applicable Law or governmental order or regulation relating to the
spacing of wells or to obtain the


                                      -29-


maximum allowable  production under any Applicable Law or governmental  order or
regulation  relating  to the  proration  of  production  therefrom;  and further
provided  that  the  Hydrocarbons  produced  from any  unit so  formed  shall be
allocated among the separately owned tracts or interests  comprising the unit in
a uniform manner consistently  applied.  Any unit so formed may relate to one or
more zones or horizons,  and a unit formed for a particular zone or horizon need
not conform in area to any other unit  relating to a different  zone or horizon,
and a unit  formed for the  production  of oil need not conform in area with any
unit formed for the production of gas.  Immediately  after formation of any such
unit,  the  Mortgagor  shall  furnish  to the Agent a true  copy of the  pooling
agreement,  declaration  of pooling or other  instrument  creating such unit, in
such number of counterparts as the Agent may reasonably request. The interest in
any such unit  attributable  to the  Mortgaged  Property  (or any part  thereof)
included  therein  shall  become a part of the  Mortgaged  Property and shall be
subject to the lien hereof in the same manner and with the same effect as though
such unit and the interest of the Mortgagor therein were specifically  described
in Exhibit A. The Mortgagor may enter into pooling or unitization agreements not
hereinabove  authorized only with the prior written consent of the Agent,  which
consent will not be unreasonably withheld.

     6.2  Actions or  Advances  by the  Agent.  Each and every  covenant  herein
contained shall be performed and kept by the Mortgagor solely at the Mortgagor's
expense.  If the Mortgagor shall fail to perform or keep any of the covenants of
whatsoever kind or nature contained in this instrument, the Agent, or any keeper
or receiver appointed hereunder, may, but shall not be obligated to, take action
and/or  make  advances to perform the same in the  Mortgagor's  behalf,  and the
Mortgagor  hereby  agrees to repay the expense of such action and such  advances
upon demand plus interest at an annual rate equal to the Alternate Base Rate (as
defined in the Credit  Agreements) of interest from time to time accruing on the
Loan Note plus the Applicable Margin (as defined in the Credit  Agreements) plus
two percent (2%) until paid or, in the event any promissory  note evidences such
indebtedness,  upon the terms and conditions  thereof. No such advance or action
by the Agent or any keeper or receiver  appointed  hereunder  shall be deemed to
relieve the Mortgagor from any default hereunder.

     6.3 Defense of Claims.  The  Mortgagor  will notify the Agent,  in writing,
promptly of the  commencement  of any legal  proceedings  affecting  the lien or
security  interest hereof or the Mortgaged  Property,  or any part thereof,  and
will take such action,  employing  attorneys as set forth in Section 2.4(j),  as
may be necessary or  appropriate  to preserve  the  Mortgagor's  and the Agent's
rights affected thereby and/or to hold harmless the Agent and the Lender Parties
in respect of such proceedings;  and should the Mortgagor fail or refuse to take
any such action,  the Agent may, upon giving prior written notice thereof to the
Mortgagor,  take such action in behalf and in the name of the  Mortgagor  and at
the Mortgagor's expense. Moreover, the Agent may take such independent action in
connection  therewith as it may in its  discretion  deem proper,  the  Mortgagor
hereby agreeing that all sums advanced or all expenses  incurred in such actions
plus interest at an annual rate equal to the Alternate  Base Rate (as defined in
the Credit  Agreements)  of interest from time to time accruing on the Loan Note
plus the  Applicable  Margin  (as  defined in the  Credit  Agreements)  plus two
percent (2%) until


                                      -30-


paid,  will, on demand,  be reimbursed,  as  appropriate,  to the Agent,  or any
keeper or receiver  appointed  hereunder.  The  obligations  of the Mortgagor as
hereinabove   set  forth  in  this  Section  6.3  shall   survive  the  release,
termination, foreclosure or assignment of this instrument or any sale hereunder.

     6.4 The Mortgaged  Property to Revert.  If the Indebtedness  shall be fully
paid and the covenants herein contained shall be well and truly performed,  then
all of the  Mortgaged  Property  shall  revert to the  Mortgagor  and the entire
estate,  right,  title and interest of the Agent shall thereupon  cease; and the
Agent  in  such  case  shall,  upon  the  request  of the  Mortgagor  and at the
Mortgagor's  cost and  expense,  deliver  to the  Mortgagor  proper  instruments
acknowledging release and satisfaction of this instrument.

     6.5 Renewals, Amendments and Other Security. Renewals and extensions of the
Indebtedness  and  modifications  of any kind of the Obligations may be given at
any time and amendments may be made to agreements with third parties relating to
any part of such  Indebtedness or the Mortgaged  Property and the Agent may take
or may now hold other  security  from others for the  Indebtedness,  all without
notice to or consent of the Mortgagor.  The Agent may resort first to such other
security or any part thereof or first to the  security  herein given or any part
thereof, or from time to time to either or both, even to the partial or complete
abandonment  of either  security,  and such action  shall not be a waiver of any
rights conferred by this  instrument,  which shall continue as a first lien upon
and prior perfected  security  interest in the Mortgaged  Property not expressly
released  until the Notes and all other  Indebtedness  secured  hereby are fully
paid.

     6.6 Instrument an Assignment,  etc. This  instrument  shall be deemed to be
and may be  enforced  from  time to time  as an  assignment,  chattel  mortgage,
contract,  financing statement,  real estate (immovable  property) mortgage,  or
security agreement, and from time to time as any one or more thereof.

     6.7  Limitation  on Interest.  No provision  of this  instrument  or of the
Notes,  the Credit  Agreements  or any other Loan  Document  shall  require  the
payment or permit the  collection  of interest  in excess of the Maximum  Lawful
Rate or which is otherwise contrary to Applicable Law. If any excess of interest
in such respect is herein or in the Notes,  the Credit  Agreements  or any other
Loan Document provided for, or shall be adjudicated to be so provided for herein
or in the Notes, the Credit Agreements or any other Loan Document, the Mortgagor
shall not be obligated to pay such excess.

     6.8 Unenforceable or Inapplicable Provisions. If any provision hereof or of
the Notes is invalid or unenforceable in any jurisdiction,  the other provisions
hereof  or of  the  Notes  shall  remain  in  full  force  and  effect  in  such
jurisdiction,  and the remaining  provisions hereof shall be liberally construed
in favor of the Agent in order to  effectuate  the  provisions  hereof,  and the
invalidity  of any  provision  hereof in any  jurisdiction  shall not affect the
validity or enforceability of any such provision in any other jurisdiction.  Any
reference  herein  contained  to a statute or law of a state in which no part of
the


                                      -31-


Mortgaged Property is situated shall be deemed inapplicable to, and not used in,
the interpretation hereof.

     6.9 Rights Cumulative.  Each and every right, power and remedy herein given
to the Agent shall be cumulative  and not  exclusive;  and each and every right,
power and remedy whether  specifically herein given or otherwise existing may be
exercised  from  time to time and so often  and in such  order as may be  deemed
expedient by the Agent,  as the case may be, and the exercise,  or the beginning
of the exercise, of any such right, power or remedy shall not be deemed a waiver
of the right to exercise, at the same time or thereafter, any other right, power
or remedy. No delay or omission by the Agent in the exercise of any right, power
or remedy  shall  impair any such right,  power or remedy or operate as a waiver
thereof or of any other right, power or remedy then or thereafter existing.

     6.10 Waiver by the Agent. Any and all covenants in this instrument may from
time to time by  instrument  in  writing  signed  by the Agent be waived to such
extent and in such manner as the Agent may desire, but no such waiver shall ever
affect or impair the Agent's  rights or liens or security  interests  hereunder,
except to the extent specifically stated in such written instrument.

     6.11 Environmental  Indemnification.  The Mortgagor will indemnify and hold
the Agent harmless from and against and reimburse the Agent with respect to, any
and all claims, demands, causes of action, losses, damages,  liabilities,  costs
and expenses (including  reasonable  attorney's fees and court costs) of any and
every kind or character, known or unknown, fixed or contingent, out-of-pocket or
consequential,  asserted  against  or by the  Agent at any time and from time to
time by reason of or arising  out of any  violation  of any  Environmental  Laws
applicable  to the  Mortgagor  and/or  the  Mortgaged  Property  and any and all
matters  arising out of any act,  omission,  event or  circumstance  existing or
occurring (including, without limitation, the presence on the Mortgaged Property
or release from the  Mortgaged  Property of hazardous  substances or solid waste
disposed of or otherwise  released),  regardless  of whether the act,  omission,
event or circumstance  constituted a violation of any  Environmental  Law at the
time of its  existence  or  occurrence.  The  terms  "hazardous  substance"  and
"release"  shall  have  the  meanings  specified  in the  Federal  Comprehensive
Environmental Response,  Compensation and Liability Act of 1980, as subsequently
modified,  supplemented or amended (herein called "CERCLA"), and for purposes of
RCRA (as defined below)  compliance the terms "solid waste" and "disposed" shall
have the meanings  specified in the Federal  Resource  Conservation and Recovery
Act of 1976, as  subsequently  modified,  supplemented or amended (herein called
"RCRA");  provided,  in the event that either CERCLA or RCRA is amended so as to
broaden the meaning of any term  defined  thereby,  such broader  meaning  shall
apply  subsequent to the effective date of such amendment and provided  further,
to the extent  the laws of any  jurisdiction  where the  Mortgaged  Property  is
located on the date  hereof or on any  subsequent  date  establish a meaning for
"hazardous  substance," "release," "solid waste," or "disposal" which is broader
than that specified in either CERCLA or RCRA,  such broader meaning shall apply.
If and to the extent that the foregoing undertaking may be unenforceable for any
reason,  the  Mortgagor  hereby agrees to make the maximum  contribution  to the


                                      -32-


payment and satisfaction of the indemnified claims,  demands,  causes of action,
losses,  damages,  liabilities,  costs,  expenses and fees which is  permissible
under  applicable law. The obligations of the Mortgagor as hereinabove set forth
in this Section  6.11 shall  survive the release,  termination,  foreclosure  or
assignment of this instrument or any sale hereunder.

     6.12 No Partnership.  Nothing  contained in this instrument is intended to,
or shall be construed as,  creating to any extent and in any manner  whatsoever,
any  partnership,  joint  venture,  or  association  among the Mortgagor and the
Agent, or in any way as to make the Agent a co-principal with the Mortgagor with
reference to the  Mortgaged  Property,  and any  inferences  to the contrary are
hereby expressly negated.

     6.13 Successors and Assigns. This instrument is binding upon the Mortgagor,
the  Mortgagor's  successors and assigns,  and shall inure to the benefit of the
Agent, its successors and assigns,  and the provisions  hereof shall likewise be
covenants running with the land.

     6.14 Article and Section Headings. The article and section headings in this
instrument are inserted for convenience of reference and shall not be considered
a part of this instrument or used in its interpretation.

     6.15  Execution in  Counterparts.  This  instrument  may be executed in any
number of counterparts,  each of which shall for all purposes be deemed to be an
original and all of which are identical,  except that, to facilitate recordation
or filing,  in any  particular  counterpart  portions of Exhibit A hereto  which
describe  properties  situated in  parishes  other than the parish in which such
counterpart is to be recorded or filed may have been omitted.

     6.16 Special Filing as Financing Statement.  This instrument shall likewise
be a Security  Agreement and a Financing  Statement.  This  instrument  shall be
filed for record,  among  other  places,  in the real estate  records and in the
Uniform  Commercial  Code  records  of each  parish in which any  portion of the
immovable  property  covered  by the oil and gas leases  described  in Exhibit A
hereto is situated,  and,  when filed in such  parishes  shall be effective as a
financing  statement  covering  Fixtures  located on oil and gas  properties and
as-extracted collateral, which as-extracted collateral are to be financed at the
wellheads  of the wells  located  on the lands  described  in  Exhibit A. At the
option  of the  Agent,  a carbon,  photographic  or other  reproduction  of this
instrument or of any financing  statement covering the Mortgaged Property or any
portion thereof shall be sufficient as a financing statement and may be filed as
such.

     6.17 Notices. Any notice,  request, demand or other instrument which may be
required  or  permitted  to be  given or  served  upon  the  Mortgagor  shall be
sufficiently  given when mailed by first-class mail,  addressed to the Mortgagor
at the address shown below the  signatures  at the end of this  instrument or to
such different  address as the Mortgagor shall have designated by written notice
received by the Agent.


                                      -33-


     6.18  Waivers.  The  parties  hereto  expressly  waive  the  production  of
mortgage,  conveyance, tax research or other certificates and hereby release and
hold the Notary Public whose name is hereunder signed harmless for and by reason
of the nonproduction and nonannexation thereof to this instrument. The Mortgagor
waives  in  favor  of the  Agent  any and all  homestead  exemptions  and  other
exemptions  of seizure or  otherwise  to which  Mortgagor  is or may be entitled
under the  constitution  and statutes of the State of  Louisiana  insofar as the
Mortgaged  Property is concerned.  Mortgagor further waives:  (a) the benefit of
appraisement  as provided in Louisiana  Code of Civil  Procedure  Articles 2332,
2336,  2723 and 2724, and all other laws conferring the same; (b) the demand and
three days delay accorded by Louisiana Code of Civil Procedure Articles 2639 and
2721; (c) the notice of seizure  required by Louisiana  Code of Civil  Procedure
2293 and 2721;  (d) the three days delay  provided  by  Louisiana  Code of Civil
Procedure Articles 2331 and 2722; and (e) the benefit of the other provisions of
Louisiana Code of Civil Procedure Articles 2331, 2722 and 2723, not specifically
mentioned above.

     6.19 Transfer of the Notes without  Notarial Act. The parties  hereto agree
that the Notes may be  transferred  without the  necessity for a notarial act of
transfer  thereof,  and that any such transfer  without notarial act shall carry
with it into the hands of any  future  holder or  holders  of the Notes full and
entire  subrogation  of title  in and to the  Notes  to any and all  rights  and
privileges  under this instrument  herein granted to the Agent, as holder of the
Notes. This instrument is for the benefit of the Agent, the Lenders,  the Lender
Parties and for such other  person or persons as may from time to time become or
be the  holders  of any  of the  Indebtedness,  and  this  instrument  shall  be
transferable  and  negotiable,  with the same  force and  effect and to the same
extent as the Indebtedness  may be transferable,  it being understood that, upon
the  transfer  or  assignment  by the  Agent,  the  Lenders or any of the Lender
Parties of any of the Indebtedness,  the legal holder of such Indebtedness shall
have all of the rights granted to the Agent under this instrument. The Mortgagor
specifically  agrees  that  upon  any  transfer  of all or  any  portion  of the
Indebtedness,  this  instrument  shall  secure  with  retroactive  rank the then
existing  Indebtedness  of the  Mortgagor  to the  transferee  and  any  and all
Indebtedness to such transferee thereafter arising.

     6.20  Authentic  Evidence.  Any  and  all  declarations  of  facts  made by
authentic  act before a notary  public in the  presence  of two  witnesses  by a
person  declaring  that such facts lie within his  knowledge,  shall  constitute
authentic  evidence  of such facts for the  purpose of  executory  process.  The
Mortgagor  specifically agrees that such an affidavit by a representative of the
Agent as to the existence, amount, terms and maturity of the Indebtedness and of
a default  thereunder shall constitute  authentic evidence of such facts for the
purpose of executory process.

     6.21  Reliance.   Notwithstanding   any  reference  herein  to  the  Credit
Agreements,  the  Notes  or the  Letters  of  Credit,  no party  shall  have any
obligation to inquire into the terms or conditions of any such documents and all
parties shall be fully  authorized to rely upon any statement,  certificate,  or
affidavit of Agent or any future holder of any portion of the Indebtedness as to
the occurrence of any event such as the occurrence of any Event of Default.


                                      -34-


     6.22 Governing Law. THIS INSTRUMENT IS MADE UNDER AND SHALL BE CONSTRUED IN
ACCORDANCE  WITH THE LAWS OF THE  UNITED  STATES  OF  AMERICA  AND THE  STATE OF
LOUISIANA.

     6.23  Acceptance.  Pursuant  to  Louisiana  Civil Code  Article  3289,  the
Mortgagor  acknowledges  that this  instrument  need not be signed by the Agent,
whose consent is presumed and is hereby acknowledged by the Mortgagor.

     6.24 No Liability.  The Agent shall not be liable for any error of judgment
or act  done  by the  Agent  in  good  faith,  or be  otherwise  responsible  or
accountable under any circumstances  whatsoever,  except for their negligence or
bad faith.  The Agent shall not be personally  liable in case of entry by it, or
anyone  entering by virtue of the powers herein granted them, upon the Mortgaged
Property for debts contracted or liability or damages incurred in the management
or operation of the Mortgaged  Property.  The Agent shall have the right to rely
on any  instrument,  document or signature  authorizing or supporting any action
taken or proposed to be taken by them hereunder, believed by it in good faith to
be genuine.  The Mortgagor will, from time to time, pay the  compensation due to
the Agent  hereunder and reimburse the Agent for, and save it harmless  against,
any  and  all  liability  and  expenses  which  may  be  incurred  by it in  the
performance of its duties.

     6.25  Covenants  Running with the Land. All  Obligations  contained in this
instrument  are intended by the parties to be, and shall be  construed  as, real
rights and covenants running with the Mortgaged Property.

     6.26 The Agent as Agent for the Lender Parties. As described above, certain
Affiliates  of the Agent and the  Lenders  are or may become  parties to certain
Hedging  Agreements with the Mortgagor and/or Affiliates of the Mortgagor.  This
instrument secures the obligations of the Mortgagor and such Affiliates,  as the
case may be, under such Hedging Agreements,  and the parties acknowledge for all
purposes  that  the  Agent  acts for  itself  and as  agent  on  behalf  of such
Affiliates  of the Agent and such Lenders  which are so entitled to share in the
rights and benefits  accruing to the Agent under this  instrument  in respect of
the Mortgaged Property.

     6.27 Subrogation.  If any or all of the proceeds of the Note have been used
to extinguish,  extend or renew any indebtedness heretofore existing against the
Mortgaged Property,  then, to the extent of such funds so used, the Indebtedness
and this  instrument  shall be subrogated to all of the rights,  claims,  liens,
titles and  interests  heretofore  existing  against the  Mortgaged  Property to
secure the  indebtedness  so  extinguished,  extended  or renewed and the former
rights,  claims, liens, titles and interests,  if any, are not waived but rather
are continued in full force and effect in favor of the Agent and are merged with
the lien and security  interest  created  herein as cumulative  security for the
repayment of the Indebtedness and the satisfaction of the Obligations.

     6.28  Subordination by The Agent.  From time to time at the Agent's option,
by instrument  executed by the Agent and recorded in the real  property  records
where this


                                      -35-


instrument has been recorded, the Agent may subordinate the lien created by this
instrument to any interest in the  Mortgaged  Property.  Any such  subordination
shall be  solely  at the  Agent's  option,  and in no event  shall  the Agent be
obligated  to  subordinate  the  lien  or  security  interest  created  by  this
instrument.


                                      -36-




     THUS  DONE  AND  PASSED  IN  MULTIPLE  ORIGINALS  on the  _______  date  of
_____________,  2002 in the presence of the undersigned competent witnesses, who
hereunto sign their names,  together with  Mortgagor and me,  Notary,  after due
reading of the whole.



                                       CALPINE CORPORATION,
                                       a Delaware corporation

                                       By:______________________________________
                                       Title:___________________________________
                                       Printed Name:____________________________




The name and address of the Mortgagor and Debtor is:

Calpine Corporation
1000 Louisiana Street, Suite 800
Houston, TX  77002



WITNESSES TO SIGNATURE:


_______________________________________

_______________________________________



                                       _________________________________________
                                       NOTARY PUBLIC
                                       Residing at______________________________
                                       My Commission Expires____________________


                                                                   [LA Mortgage]




     THUS  DONE  AND  PASSED  IN  MULTIPLE  ORIGINALS  on  the  ________date  of
_____________,  2002 in the presence of the undersigned competent witnesses, who
hereunto sign their names, together with Agent and me, Notary, after due reading
of the whole.



                                        THE BANK OF NOVA SCOTIA, as Agent

                                        By:_____________________________________
                                        Title: Director
                                        Printed Name: Kemp Leonard




The name and mailing address of the Secured Party and Agent is:

The Bank of Nova Scotia, as Agent
580 California Street
Suite 2100
San Francisco, CA  94119





WITNESSES TO SIGNATURE:


__________________________________
John Quick
__________________________________



                                       _________________________________________
                                       NOTARY PUBLIC
                                       Residing at______________________________
                                       My Commission Expires____________________


                                                                   [LA Mortgage]




This Instrument Was Prepared By:

Kevin L. Shaw, Esq.
Mayer, Brown, Rowe & Maw
700 Louisiana Street, 36th Floor
Houston, TX  77002








                       SCHEDULE I To Mortgage, Assignment,
                   Security Agreement and Financing Statement,
                               dated May 1, 2002,
               from CALPINE CORPORATION to THE BANK OF NOVA SCOTIA



                          Prior Names of the Mortgagor
                          ----------------------------


Calpine Natural Gas Company L.P.
TGX Corporation
Sheridan Energy, Inc.
Sheridan California Energy, Inc.
Calpine Natural Gas California, Inc.
Calpine Natural Gas Company
Michael Petroleum Corporation


                                      -1-




                       EXHIBIT A To Mortgage, Assignment,
                   Security Agreement and Financing Statement,
                               dated May 1, 2002,
               from CALPINE CORPORATION to THE BANK OF NOVA SCOTIA

                               List of Properties
                               ------------------

     1.  Depth  limitations,  unit  designations,  unit tract  descriptions  and
descriptions  (including  percentages,   decimals  or  fractions)  of  undivided
leasehold interests, well names, "Operating Interests",  "Working Interests" and
"Net  Revenue  Interests"  contained  in this  Exhibit A and the  listing of any
percentage, decimal or fractional interest in this Exhibit A shall not be deemed
to limit or  otherwise  diminish  the  interests  being  subjected  to the lien,
security interest and encumbrance of this instrument.

     2. Some of the land  descriptions  in this  Exhibit  A may refer  only to a
portion of the land  covered  by a  particular  lease.  This  instrument  is not
limited to the land  described  in Exhibit A but is intended to cover the entire
interest  of the  Mortgagor  in any lease  described  in  Exhibit A even if such
interest  relates to land not  described in Exhibit A.  Reference is made to the
land  descriptions  contained in the documents of title recorded as described in
this Exhibit A. To the extent that the land  descriptions  in this Exhibit A are
incomplete, incorrect or not legally sufficient, the land descriptions contained
in the documents so recorded are incorporated herein by this reference.

     3. References in Exhibit A to instruments on file in the public records are
made for all purposes.  Unless provided otherwise,  all recording  references in
Exhibit A are to the official real property records of the parish or parishes in
which the mortgaged  property is located and in which records such documents are
or in the past have been customarily  recorded,  whether Conveyance Records, Oil
and Gas Records, Oil and Gas Lease Records or other records.

     4. A statement herein that a certain  interest  described herein is subject
to the terms of certain  described  or referred to  agreements,  instruments  or
other matters shall not operate to subject such interest to any such  agreement,
instrument or other matter except to the extent that such agreement,  instrument
or matter is otherwise  valid and presently  subsisting nor shall such statement
be deemed to  constitute  a  recognition  by the  parties  hereto  that any such
agreement, instrument or other matter is valid and presently subsisting.


                                      A-1




                       EXHIBIT B To Mortgage, Assignment,
                   Security Agreement and Financing Statement,
                               dated May 1, 2002,
               from CALPINE CORPORATION to THE BANK OF NOVA SCOTIA

                         Certified Copies of Resolutions
                         -------------------------------


                                      B-1




                       EXHIBIT C To Mortgage, Assignment,
                   Security Agreement and Financing Statement,
                               dated May 1, 2002,
               from CALPINE CORPORATION to THE BANK OF NOVA SCOTIA

                             Permitted Encumbrances
                             ----------------------

     All  initially-capitalized  terms used in this  Exhibit  C,  whether or not
defined  in this  instrument,  shall have the  meanings  given such terms in the
Credit Agreements.

     (a) Liens securing payment of the Obligations  granted pursuant to any Loan
Document and Liens securing  payment of the obligations  granted pursuant to the
loan documents relating to the Existing Credit Agreement;

     (b)  Liens  granted  prior  to the  Effective  Date to  secure  payment  of
Indebtedness  of the type permitted and described in clause (a) of Section 8.2.2
of the Credit Agreements;

     (c) Liens granted to secure payment of  Indebtedness  of the type permitted
and  described  in clause (b) of Section  8.2.2 of the Credit  Agreements  where
recourse is limited as  described  in clause (b) of Section  8.2.2 of the Credit
Agreements;

(d) Liens for taxes,  assessments or other governmental charges or levies not at
the time delinquent or thereafter  payable  without penalty or being  diligently
contested  in good  faith by  appropriate  proceedings  and for  which  adequate
reserves in accordance with GAAP shall have been set aside on its books;

     (e) Liens of carriers,  warehousemen,  mechanics, materialmen and landlords
incurred  in the  ordinary  course of  business  for sums not  overdue  or being
diligently  contested  in good faith by  appropriate  proceedings  and for which
adequate  reserves  in  accordance  with GAAP  shall  have been set aside on its
books;

     (f) Liens  incurred in the ordinary  course of business in connection  with
workmen's  compensation,  unemployment  insurance or other forms of governmental
insurance  or  benefits,   or  to  secure  performance  of  tenders,   statutory
obligations,  leases and contracts  (other than for borrowed money) entered into
in the ordinary course of business or to secure  obligations on surety or appeal
bonds;

     (g) judgment  Liens in existence  less than 15 days after the entry thereof
or with  respect to which  execution  has been stayed or the payment of which is
covered in full (subject to a customary deductible) by insurance maintained with
responsible insurance companies;

     (h) Liens granted to secure payment of  Indebtedness  of the type permitted
and described in clauses (e) and (g) of Section  8.2.2 of the Credit  Agreements
where recourse is limited as described in clauses (e) or (g), as applicable,  of
Section 8.2.2 of the Credit Agreements;


                                       C-1


     (i) Zoning restrictions, easements, rights of way, title irregularities and
other similar  encumbrances  which alone or in the  aggregate do not  materially
detract from the value of the property subject thereto;

     (j) Liens on the  property or assets of any  Subsidiary  of the Borrower in
favor of the Borrower;

     (k) Banker's Liens and similar Liens (including  set-off rights) in respect
of bank deposits;

     (l) Landlord's Liens and similar Liens in respect of leased property;

     (m) Liens securing  Attributable  Debt with respect to  outstanding  leases
entered into pursuant to Sale/Leaseback Transactions so long as, with respect to
Sale/Leaseback  Transactions  closing after January 1, 2002,  the amount thereof
does not exceed 10% of the consolidated  tangible assets of the Borrower and its
Subsidiaries; and

     (n) Liens incurred in connection with the extension, renewal or refinancing
of Indebtedness secured by Liens permitted and described in clauses (b), (c) and
(h) of Section 8.2.3 of the Credit Agreements;  provided, however, that (x) such
new Lien shall be limited to all or part of the same  property  that secured the
original Lien and (y) the Indebtedness  secured by such Lien at such time is not
increased (other than by an amount necessary to pay fees and expenses, including
premiums,  related  to  the  refinancing,   refunding,   extension,  renewal  or
replacement of such Indebtedness);  provided,  further, that the limitations set
forth in this clause (n) shall not apply to Liens which are otherwise  permitted
under  Section  8.2.3  of the  Credit  Agreements,  even  if such  Liens  secure
Indebtedness  issued to repay or refinance existing  Indebtedness  permitted and
described in clauses (b), (c) and (h) of Section 8.2.3 of the Credit Agreements.


                                       C-2