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                                                                 EXHIBIT 10.11



                                                               Execution Copy


                  LETTER OF CREDIT AND REIMBURSEMENT AGREEMENT


This LETTER OF CREDIT AND REIMBURSEMENT AGREEMENT, dated as of December 27,
1996 (this AGREEMENT), between CONTINENTAL NATURAL GAS, INC., an Oklahoma
corporation (the COMPANY), and CHRISTIANIA BANK, a bank organized under the
laws of Norway, acting through its New York Branch (the BANK).

                                  WITNESSETH:

         WHEREA, the Company intends from time to time to request the Bank to
issue irrevocable letters of credit in substantially the form of Exhibit A
hereto or in such other form as is acceptable to the Bank (such letters of
credit and any letters of credit issued in exchange or substitution therefor or
in renewal thereof being herein called the LETTERS OF CREDIT) for the benefit
of beneficiaries designated by the Company (each a BENEFICIARY and collectively
the BENEFICIARIES);

         NOW, THEREFORE, in consideration of the premises, and in order to
induce the Bank to issue the Letters of Credit, the parties hereto agree as
follows:

         1.      DEFINITIONS.

         As used in this Agreement and unless otherwise expressly indicated, or
unless the context clearly requires otherwise, the following terms shall have
the following meanings:

                          BASE RATE means a fluctuating interest rate per annum
                 as shall be in effect from time to time, which rate per annum
                 shall at all times be equal to the rate of interest
                 established by the Bank, in New York, New York, from time to
                 time, as the Bank's prime rate.

                          BUSINESS DAY means any day of the year other than a
                 Saturday, Sunday or other day on which banks in the City of
                 New York, New York are authorized or required by law or
                 executive order to close.
 
                          CERTIFICATE OF ISSUANCE has the meaning assigned to 
                 that term in Section 2.2.

                          COLLATERAL has the meaning assigned to that term in
                 Section 3.2.

                          COLLATERAL ACCOUNT has the meaning assigned to that
                 term in Section 3.1.
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                          CREDIT LIMIT has the meaning assigned to that term in
                 Section 2.1.

                          DATE OF ISSUANCE means, with respect to any Letter of
                 Credit, the date on which such Letter of Credit is issued by
                 the Bank.

                          DEBT means, with respect to any Person, without
                 duplication, (i) indebtedness of such Person for money
                 borrowed (including, without limitation, indebtedness
                 evidenced by notes, bonds, debentures or other similar
                 instruments and reimbursement obligations which are not
                 contingent of such Person and including revenue as well as
                 general obligations), (ii) obligations of such Person to pay
                 the deferred purchase price of property or services which
                 purchase price is due twelve months or more from the date of
                 incurrence of the obligation in respect thereof, (iii) rentals
                 payable by such Person under any lease of real or personal
                 property which shall have been, under generally accepted
                 accounting principles classified as a capital lease, and (iv)
                 all Debt of others Guaranteed by such Person, (v) all payment
                 obligations of such Person arising under any interest rate
                 swap agreement, interest rate cap agreement, interest rate
                 collar agreement, interest rate futures contract, interest
                 rate option contract or other similar arrangement and under
                 any foreign exchange contract, currency swap agreement,
                 foreign exchange futures contract, foreign exchange option
                 contract, synthetic cap or other similar agreement; provided
                 that it is understood that Debt does not include contingent
                 obligations of such Person to reimburse any other Person in
                 respect of surety bonds or letters of credit to the extent
                 that such surety bonds or letters of credit support Debt of
                 such Person.

                          DEFAULT means the occurrence of any of the events set
                 forth in Section 7.1 which after the giving of notice, the
                 passage of time, or both, would become an Event of Default.

                          EVENT OF DEFAULT has the meaning assigned to that
                 term in Section 7.1.

                          EXPIRATION DATE means, with respect to a Letter of
                 Credit as of any time, the date on which the Letter of Credit
                 is stated to expire, taking into account any extensions
                 thereof.

                          GUARANTEE means any obligation, contingent or
                 otherwise, of a Person directly or indirectly guaranteeing any
                 Debt or other obligation of any other Person, and without
                 limiting the generality of the foregoing, any obligation,
                 direct or indirect, contingent or otherwise, (i) to purchase
                 or pay (or advance or supply funds for the purchase or payment
                 of) such Debt or other obligation (whether arising by virtue
                 of partnership arrangements, by agreement to keep-well, to
                 purchase assets, goods, securities or services, to



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                 take-or-pay, or to maintain financial statement conditions or
                 otherwise) or (ii) entered into for the purpose of assuring in
                 any other manner the obligee of such Debt or other obligation
                 of the payment thereof or to protect such obligee against loss
                 in respect thereof (in whole or in part), provided that the
                 term Guarantee shall not include endorsements for collection
                 or deposit in the ordinary course of business. The term
                 "GUARANTEE" used as a verb has a corresponding meaning.

                          OBLIGATIONS has the meaning assigned to that term in
Section 3.2.

                          PERSON means an individual or a corporation,
                 partnership, trust, incorporated or unincorporated
                 association, joint venture, joint stock company, government
                 (or any agency or political subdivision thereof) or other
                 entity of any kind.

                          STATED AMOUNT means, with respect to a Letter of
                 Credit as of any time, the amount available to be drawn
                 thereunder at such time.

         2.      TERMS OF THE LETTERS OF CREDIT.

         2.1.    THE LETTERS OF CREDIT. Subject to the terms and conditions of
this Agreement, the Bank agrees to issue one or more Letters of Credit from
time to time, at any time during the period from the date hereof to and
including December 31, 1996, upon the request and authorization of the Company,
in an aggregate Stated Amount outstanding at any time not to exceed $20,633,100
(the CREDIT LIMIT). Within such limit, the Company may request the issuance of
Letters of Credit, cause outstanding Letters of Credit to be terminated and
request the issuance of additional Letters of Credit under this Section 2.

         2.2.    PROCEDURE FOR ISSUANCE OF LETTERS OF CREDIT.

                 (a)      The Company shall give the Bank written notice of its
         request for the issuance of a Letter of Credit, in substantially the
         form of Exhibit B hereto (a CERTIFICATE OF ISSUANCE), as soon as
         practicable in advance, specifying the Business Day on which the
         issuance of such Letter of Credit is requested to be made. If the
         conditions precedent to the issuance of such Letter of Credit have
         been met on the requested Date of Issuance of such Letter of Credit,
         the Bank will issue the Letter of Credit on such date.

                 (b)      Each such Letter of Credit shall name such person as
         Beneficiary, shall have such conditions of drawing, and shall have an
         Expiration Date and a Stated Amount as shall be designated by the
         Company in the related Certificate of Issuance.

                 (c)      Each Letter of Credit shall have an Expiration Date
         no later than December 30, 1997.





                                      -3-
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                 (d)      Each Letter of Credit may specify that it is subject
         to reinstatement as provided in Section 2.9.

                 (e)      Prior to the issuance of the Letter of Credit, the
         Company shall have delivered to the Bank an amount in immediately
         available funds equal to the Stated Amount of the Letter of Credit for
         deposit into the Collateral Account as provided in Section 3.1.

         2.3.    LETTER OF CREDIT FEES. The Company agrees to pay to the Bank,
as consideration for the issuance of a Letter of Credit, a letter of credit
fee, payable quarterly in arrears on the last day of each calendar quarter,
commencing on the first such date after the Date of Issuance thereof, equal to
one and one-half percent (1-1/2%) per annum of the Stated Amount thereof. In
addition, the Company agrees to pay an issuance fee of $50 for each Letter of
Credit due on the Date of Issuance of such Letter of Credit.

         2.4.    REIMBURSEMENT. (a) The Company hereby agrees to pay, or to
cause to be paid, to the Bank (i) on each date on which the Bank notifies the
Company by telecopier that it has honored any demand for payment under any
Letter of Credit a sum equal to the amount so paid under the Letter of Credit,
plus (ii) interest on the amount referred to in clause (i) above from and
including the date such amount is paid by the Bank until payment in full at a
fluctuating rate per annum equal to the Base Rate in effect from time to time
plus one and one-half percent (1-1/2%), but in no event at a rate per annum
greater than the maximum rate permitted by applicable law. If a drawing is
repaid at or prior to 3:00 P.M., New York time, on the same day on which it is
made, no interest shall be payable on such drawing.

         (b)      To the extent that amounts are available in the Collateral
Account, the Bank shall, without prior notice to the Company, automatically
apply such available amounts to the payment of the Company's reimbursement
obligations under Section 2.4(a) on the same date as any drawing giving rise to
such reimbursement obligation, and no interest shall accrue on such drawing
amount to the extent such amounts are available. Promptly after any drawing on
a Letter of Credit, the Bank shall notify the Company of the amount of such
drawing and the amount applied to its reimbursement from the Collateral
Account.

         2.5.    INTEREST ON OVERDUE AMOUNTS. Any amount due hereunder other
than under Section 2.4 (whether fees, commissions or expenses) which is not
paid when due shall bear interest, payable on demand, from the date the same
becomes due until such amount is paid in full at a fluctuating rate per annum
equal to the Base Rate in effect from time to time plus one and one-half
percent (1-1/2%), but in no event at a rate per annum greater than the maximum
rate permitted by applicable law.

         2.6.    PAYMENTS AND COMPUTATIONS. The Company shall make or cause to
be made each payment hereunder not later than 3:00 P.M., New York time, on the
day when due, in





                                      -4-
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lawful money of the United States of America, in immediately available funds,
to the Bank at its address referred to in Section 8.1. All computations of
interest hereunder shall be made on the basis of a year of 360 days for the
actual number of days elapsed (including the first day but excluding the last
day). Except as otherwise provided in this Agreement, the Bank shall send the
Company statements of all amounts due hereunder for interest, principal, and
fees, which statements shall be considered correct and conclusively binding on
the Company unless the Company notifies the Bank to the contrary within thirty
(30) days of its receipt of any statement which it deems to be incorrect.

         2.7.    PAYMENT ON NON-BUSINESS DAYS. Whenever any payment to be made
hereunder shall be stated to be due on a day other than a Business Day, such
payment shall be made on the next succeeding Business Day (and if so made,
shall be deemed to have been made when due), and such extension of time shall
in such case be included in the computation of payment of interest due
hereunder.

         2.8.    BOOK ENTRIES. The Bank shall maintain in accordance with its
usual practice an account or accounts evidencing the indebtedness of the
Company resulting from drawings on the Letters of Credit made from time to time
and the amounts of principal and interest payable and paid from time to time
under this Agreement in respect of such drawings. In any legal action or
proceeding in respect of this Agreement, the entries made in such account or
accounts shall, in the absence of manifest error, be conclusive evidence of the
existence and amounts of the obligations of the Company therein recorded.

         2.9.    REDUCTIONS AND REINSTATEMENTS OF LETTERS OF CREDIT. Each
drawing honored by the Bank under any Letter of Credit shall automatically
reduce pro tanto the amount available to be drawn under such Letter of Credit;
provided, however, that if the Certificate of Issuance relating to any Letter
of Credit so specifies, then the amount available to be drawn under a specified
drawing under the Letter of Credit shall be automatically reinstated from time
to time upon, and to the extent of, any amounts drawn by the Beneficiary and
paid by the Bank under such specified drawing under the Letter of Credit. Upon
the delivery of a reduction notice to the Bank by the Beneficiary of a Letter
of Credit, in form and substance satisfactory to the Bank together with
evidence satisfactory to the Bank as to the due authorization, execution and
delivery of such notice, the Bank shall reduce the Stated Amount of the Letter
of Credit by the amount specified in such notice by an appropriate amendment to
the Letter of Credit delivered to the Beneficiary and shall, upon confirmation
of acceptance of such amendment by the Beneficiary, pay to the Company or upon
its order out of the Collateral Account an amount equal to such reduction in
the Stated Amount.

         2.10.   OBLIGATIONS ABSOLUTE. The Obligations of the Company under
this Agreement shall be unconditional and irrevocable, and shall be paid or
performed strictly in accordance with the terms of this Agreement under all
circumstances, including, without limitation, the following circumstances:





                                      -5-
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                 (a)      any lack of validity or enforceability of any Letter
         of Credit or this Agreement against the Bank;

                 (b)      any amendment or waiver of, or any consent to
         departure from, all or any of this Agreement;

                 (c)      the existence of any claim, set-off, defense or other
         right which the Company may have at any time against any Beneficiary
         of the Letters of Credit (or any persons for whom any Beneficiary may
         be acting), the Bank or any other person, whether in connection with
         this Agreement, the transactions contemplated herein or therein or any
         unrelated transaction;

                 (d)      any certificate, statement or any other document
         presented under any Letter of Credit proving to be forged, fraudulent,
         invalid or insufficient in any respect or any statement therein being
         untrue or inaccurate in any respect, provided that payment by the Bank
         under any Letter of Credit against presentation of any such
         certificate, statement or document shall not have constituted gross
         negligence or willful misconduct of the Bank;

                 (e)      any non-application or misapplication by any
         Beneficiary of the proceeds of any drawing under any Letter of Credit;

                 (f)      payment by the Bank under any Letter of Credit
         against presentation of a draft or a certificate which does not comply
         with the terms of the Letter of Credit, provided that such payment by
         the Bank shall not have constituted negligence or willful misconduct
         of the Bank; and

                 (g)      any other circumstance or happening whatsoever,
         whether or not similar to any of the foregoing, provided that such
         other circumstance or happening shall not have been caused by gross
         negligence or willful misconduct of the Bank.

         3.      The Collateral Account.

         3.1.    MAINTAINING THE COLLATERAL ACCOUNT. So long as any Obligation
shall remain unpaid:

                 (a)      The Company will maintain an interest-bearing blocked
         deposit account (the COLLATERAL ACCOUNT) with the Bank. On or prior to
         the Date of Issuance of any Letter of Credit, the Borrower shall make
         a deposit in the Collateral Account in an amount equal to the Stated
         Amount of the Letter of Credit.

                 (b)      Except as otherwise provided in the next paragraph
         and in Section 3.3(a), no amount (including interest on the Collateral
         Account) shall be paid or released to or for the account of, or
         withdrawn by or for the account of, the Company





                                      -6-
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         or any other person or entity from the Collateral Account; provided,
         however, that the Bank shall, and is hereby authorized to, apply funds
         in the Collateral Account to the payment of due and unpaid
         Obligations, and shall promptly notify the Company in writing of any
         such application.

                 (c)      Upon any reduction in the Stated Amount of any Letter
         of Credit other than a reduction due to an unreimbursed drawing on the
         Letter of Credit, the Bank, upon the written request of the Company,
         shall pay to or upon the order of the Company out of the Collateral
         Account an amount equal to such reduction.

                 (d)      The Collateral Account shall be subject to such
         applicable laws, and such applicable regulations of the Board of
         Governors of the Federal Reserve System and of any other appropriate
         banking or governmental authority as may now or hereafter be in
         effect.

         3.2.    PLEDGE AND ASSIGNMENT. The Company hereby pledges and assigns
to the Bank, and grants to the Bank a security interest in, the following
collateral (the COLLATERAL):

                 (a)      the Collateral Account and all funds held therein;

                 (b)      all notes, certificates of deposit, deposit accounts,
         checks and other instruments from time to time hereafter delivered to
         or otherwise possessed by the Bank for or on behalf of the Company in
         substitution for or in addition to any or all of the then existing
         Collateral;

                 (c)      all interest, dividends, cash, instruments and other
         property from time to time received, receivable or otherwise
         distributed in respect of or in exchange for any or all of the then
         existing Collateral; and

                 (d)      all proceeds of any and all of the foregoing 
         Collateral.
 
This Agreement secures the payment of all reimbursement obligations of the
Company now or hereafter existing under this Agreement in respect of drawings
under the Letters of Credit and any replacements thereof (including the
principal amount of unpaid drawings and accrued interest thereon) (all such
obligations of the Company being the OBLIGATIONS).

         3.3.    INTEREST ON THE COLLATERAL ACCOUNT. (a) All moneys on deposit
from time to time in the Collateral Account shall bear interest during each
Interest Period from and including the first day thereof to but excluding the
last day thereof at a rate per annum equal to the London Interbank Bid Rate for
such Interest Period. For purposes of this Section 3.3, the term LONDON
INTERBANK BID RATE shall mean, for each Interest Period, the average bid rate,
as determined by the Bank, by major banks in London, England for deposits in
U.S. dollars for a period equal to such Interest Period as of 11:00 a.m. New
York time on the first day of such Interest Period. INTEREST PERIOD means each
successive period of one month (or





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such other period as may be agreed to by the Company and the Bank), with the
first Interest Period commencing on the date of initial deposit in the
Collateral Account, and each Interest Period thereafter commencing on the last
day of the then-expiring Interest Period; provided that (a) any Interest Period
which would otherwise end on a day which is not a Business Day shall be
extended to the next succeeding Business Day unless such Business Day falls in
another calendar month, in which case such Interest Period shall end on the
immediately preceding Business Day; (b) any Interest Period which begins on the
last Business Day of a calendar month (or on a day for which there is no
numerically corresponding day in the calendar month at the end of such Interest
Period) shall end on the last Business Day of a calendar month.  All interest
on the moneys in the Collateral Account shall be payable on the last day of
each Interest Period, shall be paid by the Bank to or upon the order of the
Company.

         (b)     If any amount on deposit in the Collateral Account is
withdrawn therefrom on any day other than the last day of an Interest Period,
the Bank shall reduce the interest payable by it for such Interest Period by an
amount equal to the cost to it of obtaining funds equal to the amount of such
withdrawal for the period from the date of such withdrawal to the last day of
such Interest Period, provided that the Bank shall have delivered to the
Company a certificate setting forth in reasonable detail the amount of such
cost, which certificate shall be conclusive in the absence of manifest error.

         3.4.    TRANSFERS AND OTHER LIENS. Neither the Bank nor the Company
will (i) sell, assign (by operation of law or otherwise), or otherwise dispose
of, or grant any option with respect to, any of the Collateral, or (ii) create
or permit to exist any lien, security interest, option or other charge or
encumbrance upon or with respect to any of the Collateral, except for the
security interest under this Agreement.

         3.5.    CONTINUING SECURITY INTEREST; ASSIGNMENTS UNDER CREDIT
AGREEMENT. This Agreement shall create a continuing security interest in the
Collateral and shall remain in full force and effect until the payment in full
of the Obligations and all other amounts payable under this Agreement. Upon the
termination of the Letters of Credit and all replacements thereof, the Bank
shall, at the written direction of the Company, promptly pay over to the
Company all amounts remaining in the Collateral Account and deliver all other
Collateral to the Company; provided, however, that the Bank shall retain an
amount of Collateral equal in value to any remaining unpaid Obligations. Upon
the later of the payment in full of the Obligations and all other amounts
payable under this Agreement and the expiration or termination of the Letters
of Credit and all replacements thereof, the security interest granted hereby
shall terminate and all rights to the Collateral shall revert to the Company.
Upon any such termination, the Bank will, at the Company's expense, return to
the Company such of the Collateral as shall not have been sold or otherwise
applied pursuant to the terms hereof and execute and deliver to the Company
such documents as the Company shall reasonably request to evidence such
termination.





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         4.      CONDITIONS PRECEDENT.

         4.1.    CONDITIONS PRECEDENT TO ISSUANCE OF THE LETTERS OF CREDIT. The
obligation of the Bank to issue the Letters of Credit is subject to the
condition precedent that the Bank shall have received, on or before the Date of
Issuance of the initial Letter of Credit, the following, each in form and
substance satisfactory to the Bank:

                 (a)      A copy of the articles of incorporation of the
         Company, certified as of a recent date by the Secretary of State of
         Oklahoma.

                 (b)      A good standing certificate for the Company, issued
         as of a current date by the Secretary of State of Oklahoma.

                 (c)      A certificate of the associate general counsel and
         assistant secretary of the Company certifying (i) that attached
         thereto is a true and complete copy of the bylaws of the Company as in
         effect on the date of such certification, (ii) that attached thereto
         is a true and complete copy of resolutions adopted by the board of
         directors of the Company authorizing the execution, delivery and
         performance of this Agreement, Certificates of Issuance and the other
         documents to be delivered by the Company in connection herewith and
         therewith, and (iii) as to the incumbency and genuineness of the
         signature of each officer of the Company executing this Agreement.

                 (d)      A Certificate of Issuance for the initial Letter of
         Credit containing the information specified in Section 2.2 and duly
         executed by an authorized officer of the Company.

         5.      REPRESENTATIONS AND WARRANTIES.

         5.1.    REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company
           represents and warrants as follows:

                 (a)      Due Organization. The Company is a corporation duly
         organized, validly existing and in good standing under the laws of
         Oklahoma and is duly qualified and in good standing as a foreign
         corporation in each other jurisdiction where the nature of the
         business conducted by the Company makes such qualification necessary
         and where the failure to so qualify would have a material adverse
         effect on its business or properties, has all necessary power and
         authority (corporate and other) to own its properties, to conduct its
         business as presently conducted or proposed to be conducted and to
         execute, deliver and perform this Agreement.

                 (b)      Due Authorization; No Violation. The execution,
         delivery and performance by the Company of this Agreement have been
         duly authorized by all necessary corporate action, and do not and will
         not violate any law or any regulation,





                                      -9-
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         order, writ, injunction or decree of any court or governmental body,
         agency or other instrumentality applicable to the Company, or result
         in a breach of any of the terms, conditions or provisions of, or
         constitute a default under, or result in the creation or imposition of
         any mortgage, lien, charge or encumbrance of any nature whatsoever
         upon any of the assets of the Company pursuant to the terms of, the
         Company's articles of incorporation or by-laws, or any mortgage,
         indenture, agreement or instrument to which the Company is a party or
         by which it or any of its properties is bound.

                 (c)      Consents. All authorizations, consents and approvals
         of, notices to, registrations or filings with, or other actions in
         respect of or by, any court or any governmental body, agency or other
         instrumentality required in connection with the execution, delivery
         and performance by the Company of this Agreement have been duly
         obtained, given or taken and are in full force and effect.

                 (d)      Enforceability. This Agreement has been duly executed
         and delivered by the Company and (assuming due authorization,
         execution and delivery of this Agreement by the Bank) constitutes the
         legal, valid and binding obligation of the Company, enforceable
         against the Company in accordance with its terms, except as
         enforceability thereof may be limited by bankruptcy, insolvency,
         reorganization, moratorium or similar laws affecting enforcement of
         creditors' rights generally and by general principles of equity
         (regardless of whether such enforceability is considered in a
         proceeding at law or in equity).

                 (e)      Legal Proceedings. There is no action, suit,
         proceeding, inquiry or investigation, at law or in equity, before or
         by any governmental authority pending or, to the best of the Company's
         knowledge, threatened against or affecting the Company (and to the
         best of the Company's knowledge, there is no basis therefor) wherein
         an unfavorable decision, ruling or finding is probable and would (a)
         materially adversely affect the transactions contemplated by this
         Agreement or (b) affect the validity or enforceability of this
         Agreement or any agreement or instrument to which the Company is a
         party used or contemplated for use in connection with the transactions
         contemplated by this Agreement.

                 (f)      Financial Information. The balance sheet of the
         Company, as of October 31, 1996, a copy of which has been delivered to
         the Bank, fairly presents, in conformity with generally accepted
         accounting principles, the financial position of the Company as of
         such date and its results of operations, cash flows, changes in
         financial position and changes in stockholders' equity for such fiscal
         year.

                 (g)      No Adverse Change. Since October 31, 1996, there has
         been no material adverse change in the business, financial position,
         results of operations or prospects of the Company.





                                      -10-
   11
                 (h)      Violations of Law. The business of the Company is not
         being conducted in violation of any law, ordinance or regulation of
         any governmental authority, including any filing requirement in
         respect thereof, except for violations which, individually or in the
         aggregate, do not and will not have material adverse effect on the
         assets, operations, prospects or condition, financial or otherwise, of
         the Company.

                 (i)      Governmental Authorizations to Conduct Business. The
         Company possesses all permits and other governmental authorizations
         that are material to the conduct of its business. Such licenses,
         permits and other governmental authorizations are valid and sufficient
         for the business presently carried on by the Company, and neither the
         execution, delivery or performance of this Agreement nor the
         consummation of the transactions contemplated hereby will affect the
         validity thereof or require consent with respect thereto, and, to the
         best of the knowledge of the Company, there is no threat of suspension
         or cancellation of any such license, permit or governmental
         authorization.

                 (j)      No Defaults. The Company is not in default under its
         articles of incorporation or bylaws or any law or any regulation,
         order, writ, injunction or decree of any court or any governmental
         body, agency or other instrumentality applicable to the Company. No
         event has occurred and is continuing, or would result from the
         issuance of the Letters of Credit, which constitutes a Default or an
         Event of Default.

                 (k)      Pledge of Collateral The Company is the legal and
         beneficial owner of the Collateral, free and clear of any lien,
         security interest, option or other charge or encumbrance except for
         the security interest created by this Agreement, and the pledge and
         assignment of the Collateral pursuant to this Agreement creates a
         valid and perfected first priority security interest in the
         Collateral, securing the payment of the Obligations.

         6.      COVENANTS.

         6.1.    AFFIRMATIVE COVENANTS. So long as a drawing is available under
any Letter of Credit or the Company shall have any obligation to pay any amount
to the Bank hereunder, the Company will, unless the Bank shall otherwise
consent in writing, comply with the following affirmative covenants:

                 (a)      Maintenance of Corporate Existence. The Company will
         preserve, renew and keep in full force and effect its corporate
         existence and its rights, privileges and franchises necessary or
         desirable in the normal conduct of business and which are material to
         the Company.

                 (b)      Compliance with Laws. The Company will comply with 
         all applicable





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         laws and all applicable rules, regulations and orders of any court or
         any governmental body, agency or other instrumentality, non-compliance
         with which would have a material adverse effect on its business,
         financial condition or results of operations or would materially
         adversely affect the Company's ability to perform its obligations
         under this Agreement.

                 (c)      Payment of Taxes. The Company will promptly pay and
         discharge all taxes, assessments and governmental charges and levies
         upon it or upon any of its income, profits or property; provided,
         however, that the Company shall not be required to pay any tax,
         assessment, charge or levy (i) the payment of which is being contested
         in good faith by appropriate proceedings and (ii) as to which the
         Company shall have set aside on its books reserves for such tax,
         assessment, charge or levy as are determined to be adequate by the
         application of generally accepted accounting principles consistently
         applied.

                 (d)      Property, Books and Records. The Company will keep,
         and will cause each of its Subsidiaries to keep, proper books of
         record and accounts in which proper entries shall be made of all
         dealings and transactions in relation to its business and activities.

                 (e)      Reporting Requirements. The Company will furnish to
         the Bank:

                          (i)     Quarterly Financial Statements. As soon as
                 available and in any event within 60 days after the end of
                 each of the first three fiscal quarters of the Company, the
                 balance sheet of the Company as at the end of such fiscal
                 quarter and the related statements of income and cash flows
                 for such fiscal quarter, which shall set forth in each case in
                 comparative form the figures for the corresponding quarter for
                 the previous year, certified by the chief financial officer of
                 the Company to have been prepared in accordance with generally
                 accepted accounting principles applied on a basis consistent
                 with that applied to the preparation of the Company's annual
                 financial statements;

                          (ii)    Annual Financial Statements. As soon as
                 available and in any event within 120 days after the end of
                 each fiscal year of the Company, the balance sheet of the
                 Company as at the end of such fiscal year and the related
                 statements of income and cash flows for such fiscal year,
                 which shall set forth in each case in comparative form the
                 figures for the previous fiscal year, reported on by
                 independent public accountants of nationally recognized
                 standing satisfactory to the Bank (which report shall not be
                 qualified as to the scope of the audit or as a result of
                 non-conformity with generally accepted accounting principles
                 or auditing standards);

                          (iii)   Events of Default. As soon as possible and 
                 in any event within





                                      -12-
   13
                 ten (10) days after the occurrence and continuance of any
                 Default or Event of Default, a statement setting forth details
                 of such default and the action which the Company proposes to
                 take with respect thereto; the financial statements delivered
                 by the Company immediately following the end of each calendar
                 quarter and of each fiscal year shall be accompanied by the
                 certification of the Company's Vice President of Finance and
                 Treasurer that, to the best of his knowledge after diligent
                 investigation, no Default or Event of Default exists under any
                 provision of this Agreement or setting forth the details of
                 any such Default or Event of Default and the action which the
                 Company is taking or proposes to take with respect thereto;
                 and

                          (iv)    Bankruptcy Proceedings. Immediately, notice
                 of the commencement of any proceedings by or against the
                 Company under any applicable bankruptcy, reorganization,
                 liquidation, insolvency or other similar law now or hereafter
                 in effect or of any proceeding in which a receiver,
                 liquidator, trustee or other similar official is sought to be
                 appointed for the Company.

                 (f)      Further Assurances. The Company shall execute,
         acknowledge where appropriate, and deliver, and cause to be executed,
         acknowledged where appropriate, and delivered, from time to time
         promptly at the request of the Bank all such instruments and documents
         as in the opinion of the Bank are reasonably necessary to carry out
         the intent and purpose of this Agreement.

         6.2.    NEGATIVE COVENANTS. So long as a drawing is available under
any Letter of Credit or the Company shall have any obligation to pay any amount
to the Bank hereunder, the Company will, unless the Bank shall otherwise
consent in writing, comply with the following negative covenants:

                 (a)      Consolidations and Mergers. The Company will not
         consolidate or merge with or into any other person unless (i) the
         Company is the corporation surviving such consolidation or merger, or
         the corporation surviving such consolidation or merger, if not the
         Company, assumes the obligations of the Company hereunder in a writing
         acceptable to the Bank and (ii) in each case, after giving effect
         thereto, no Default shall have occurred and be continuing.

                 (b)      Untrue Statements or Omissions. The Company will not
         willfully furnish or cause to be furnished to the Bank any certificate
         or other document that will contain any untrue statement of material
         fact or that will omit to state a material fact necessary to make it
         not misleading in light of the circumstances under which it was
         furnished.





                                      -13-
   14
         7.      EVENTS OF DEFAULT; REMEDIES.

         7.1.    EVENTS OF DEFAULT. It shall be deemed an EVENT OF DEFAULT if
any of the following events shall occur and be continuing:

                 (a)      The amount of any reimbursement obligation payable
         under Section 2.4 shall not be paid within one day after the same
         shall be due or any other amount payable under this Agreement shall
         not be paid within five days after the same shall be due; or

                 (b)      Any material representation or warranty made or
         deemed to have been made by the Company under or in connection with
         this Agreement or any document, instrument or certificate delivered in
         connection herewith or therewith shall prove to have been incorrect in
         any material respect when made or deemed to have been made; or

                 (c)      The Company shall fail to perform or observe any
         term, covenant or agreement applicable to it contained in this
         Agreement (other than as elsewhere specifically addressed in this
         Section 7.1), and any such failure shall remain unremedied for 30 days
         after written notice shall have been given to the Company by the Bank;
         or

                 (d)      The Company shall fail to pay any Debt of the
         Company, or any interest or premium thereon, when due (whether by
         scheduled maturity, required prepayment, acceleration, demand or
         otherwise) and such failure shall continue after the applicable grace
         period, if any, specified in the agreement or instrument relating to
         such Debt; or any other default under any agreement or instrument
         relating to any such Debt, or any other event, shall occur and shall
         continue after the applicable grace period, if any, specified in such
         agreement or instrument, if the effect of such default or event is to
         accelerate, or to permit the acceleration of, the maturity of such
         Debt; or any such Debt shall be declared to be due and payable, or
         required to be prepaid (other than by a regularly scheduled required
         prepayment), prior to the stated maturity thereof; or

                 (e)      The Company shall commence a voluntary case or other
         proceeding seeking liquidation, reorganization or other relief with
         respect to itself or its debts under any bankruptcy, insolvency or
         other similar law now or hereafter in effect or seeking the
         appointment of a trustee, receiver, liquidator, custodian or other
         similar official of it or any substantial part of its property, or
         shall consent to any such relief or to the appointment of or taking
         possession by any such official in an involuntary case or other
         proceeding commenced against it, or shall make a general assignment
         for the benefit of creditors, or shall admit in writing its inability
         to pay its debts generally, as and when due, or shall fail generally
         to pay its debts as they become due, or shall take any corporate
         action to authorize any of the foregoing; or





                                      -14-
   15
                 (f)      An involuntary case or other proceeding shall be
         commenced against the Company seeking liquidation, reorganization or
         other relief with respect to it or its debts under any bankruptcy,
         insolvency or other similar law now or hereafter in effect or seeking
         the appointment of a trustee, receiver, liquidator, custodian or other
         similar official of it or any substantial part of its property, and
         such involuntary case or other proceeding shall remain undismissed and
         unstayed for a period of 90 days; or an order for relief shall be
         entered against the Company under the Federal bankruptcy laws as now
         or hereafter in effect; or

         7.2.    REMEDIES. If an Event of Default shall have occurred then, and
in any such event at any time thereafter if such Event of Default is
continuing, the Bank may, in its discretion, do any one or more of the
following:

                 (a)      The Bank may, without notice to the Company except as
         required by law and at any time or from time to time, charge, set-off
         and otherwise apply all or any part of the Collateral Account against
         the Obligations or any part thereof then due.

                 (b)      The Bank may also exercise in respect of the
         Collateral, in addition to other rights and remedies provided for
         herein or otherwise available to it, all the rights and remedies of a
         secured party on default under the Uniform Commercial Code in effect
         in the State of New York at that time (the "Code") (whether or not the
         Code applies to the affected Collateral), and may also, without notice
         except as specified below, sell the Collateral or any part thereof in
         one or more parcels at public or private sale, at any of the Bank's
         offices or elsewhere, for cash, on credit or for future delivery, and
         upon such other terms as the Bank may deem commercially reasonable.
         The Company agrees that, to the extent notice of sale shall be
         required by law, at least ten days' notice to the Company of the time
         and place of any public sale or the time after which any private sale
         is to be made shall constitute reasonable notification. The Bank shall
         not be obligated to make any sale of Collateral regardless of notice
         of sale having been given. The Bank may adjourn any public or private
         sale from time to time by announcement at the time and place fixed
         therefor, and such sale may, without further notice, be made at the
         time and place to which it was so adjourned.

                 (c)      Any cash held by the Bank as Collateral and all cash
         proceeds received by the Bank in respect of any sale of, collection
         from, or other realization upon all or any part of the Collateral may,
         in the discretion of the Bank, be held by the Bank as collateral for,
         and/or then or at any time thereafter be applied (after payment of any
         amounts payable to the Bank pursuant to Section 8.3 or 8.5) in whole
         or in part by the Bank against, all or any part of the Obligations in
         such order as the Bank shall elect. Any surplus of such cash or cash
         proceeds held by the Bank and remaining after payment in full of all
         the Obligations shall be paid over to the Company or to whomsoever may
         be lawfully entitled to receive such surplus.





                                      -15-
   16

                 (d)      The Bank may exercise any or all other rights and
         remedies existing at law or in equity or by statute (including,
         without limitation, the right to proceed by appropriate court action,
         either at law or in equity, to enforce performance by the Company of
         the applicable representations and warranties and covenants of this
         Agreement or to recover damages for the breach thereof).

         7.3.    RIGHTS AND REMEDIES CUMULATIVE; WAIVERS. The Bank's rights and
remedies under this Agreement shall be cumulative and not exclusive of any
other right or remedy which the Bank may have. No delay or omission to exercise
any remedy, right or power accruing upon an Event of Default shall impair any
such remedy, right or power or shall be construed as a waiver thereof, but any
such remedy, right or power may be exercised from time to time and as often as
may be deemed expedient. A waiver of one Default or Event of Default shall not
be construed to be a waiver of any subsequent Default or Event of Default or
impair any remedy, right or power consequent thereon.

         7.4.    BANK APPOINTED ATTORNEY-IN-FACT. The Company hereby appoints
the Bank the Company's attorney-in-fact, with full authority in the place and
stead of the Company and in the name of the Company or otherwise, from time to
time in the Bank's discretion, but only following and during the continuance of
an Event of Default, to take any action and to execute any instrument which the
Bank may deem necessary or advisable to accomplish the purposes of this
Agreement, including, without limitation, to receive, endorse and collect all
instruments made payable to the Company representing any interest payment,
dividend or other distribution in respect of the Collateral or any part thereof
and to give full discharge for the same. The power of attorney hereby granted
is coupled with an interest and shall be irrevocable until all Obligations have
been satisfied.

         8.      Miscellaneous.

         8.1.    NOTICES. Any notices or consents required or permitted by this
Agreement shall be in writing and shall be deemed delivered if delivered in
person or if sent by registered mail, postage prepaid, return receipt
requested, or facsimile transmitter, as follows, unless such address is changed
by written notice hereunder:

         (A)     If to the Borrower:

                 Continental Natural Gas, Inc.
                 1412 South Boston Avenue, Suite 500
                 Tulsa, Oklahoma 74119
                 Attention: Garry D. Smith
                 Telecopy: (918) 560-4900





                                      -16-
   17
         with copies to:

                 Albright & Rusher
                 2600 Boatmen's Center
                 15 West Sixth Street
                 Tulsa, Oklahoma 74119
                 Attention: Kenneth F. Albright, Esq.

         (B)     If to the Bank:

                 Christiania Bank
                 New York Branch
                 11 West 42nd Street, 7th Floor
                 New York, New York 10036
                 Attention: Energy and Natural Resources
                 Telecopy: (212) 827-4888

         with copies to:

                 Graham & James LLP
                 885 Third Avenue
                 New York, New York 10022
                 Attention: Elwood F. Collins, Jr., Esq.

         8.2.    AMENDMENTS, ETC. No amendment or waiver of any provision of
this Agreement, nor consent to any departure by the Company therefrom, shall in
any event be effective unless the same shall be in writing and signed by the
Bank, and, in the case of an amendment, the Company, and then such waiver or
consent shall be effective only in the specific instance and for the specific
purpose for which given.

         8.3.    INDEMNIFICATION. The Company hereby indemnifies and holds the
Bank harmless from and against any and all claims, damages, losses,
liabilities, or reasonable costs or expenses which the Bank may incur or which
may be claimed against the Bank by any person:

                 (a)      by reason of or in connection with the execution,
         delivery or performance or default thereof of this Agreement or any
         transaction contemplated hereby (except to the extent indemnification
         pursuant to this paragraph would be inconsistent with any exclusion
         from indemnification pursuant to the following paragraph of this
         Section 8.3); or

                 (b)      by reason of or in connection with the execution and
         delivery of, or payment or failure to make payment under, any Letter
         of Credit; provided, however, that the Company shall not be required
         to indemnify the Bank pursuant to this Section 8.3(b) for any claims,
         damages, losses, liabilities, costs or expenses to the extent, but
         only to the extent, caused by (i) the willful misconduct or negligence
         of





                                      -17-
   18
         the Bank in determining whether a certificate presented under the
         Letter of Credit complied with the terms of the Letter of Credit, or
         (ii) the Bank's wrongful failure to make lawful payment under the
         Letter of Credit after the presentation to it by the Beneficiary of a
         certificate strictly complying with the terms and conditions of the
         Letter of Credit.

         Nothing in this Section 8.3 is intended to limit the obligations of
the Company contained in Section 2. The obligations of the Company under this
Section 8.3 shall survive any termination of this Agreement.

         8.4.    LIABILITY OF THE BANK. The Company assumes all risks of the
acts or omissions of the Beneficiary and any transferee of any Letter of Credit
with respect to its use of the Letter of Credit. Neither the Bank nor any of
its officers or directors shall be liable or responsible for: (a) the use which
may be made of any Letter of Credit or any acts or omissions of the Beneficiary
or any transferee in connection therewith; (b) the validity, sufficiency or
genuineness of documents, or of any endorsement thereon, even if such documents
should prove to be in any or all respects invalid, insufficient, fraudulent or
forged; (c) payment by the Bank against presentation of documents which do not
comply with the terms of any Letter of Credit, including failure of any
documents to bear any reference or adequate reference to the Letter of Credit;
or (d) any other circumstances whatsoever in making or failing to make payment
under any Letter of Credit; provided that the Company shall have a claim
against the Bank, and the Bank shall be liable to the Company, to the extent of
any direct, as opposed to consequential, damages suffered by the Company which
the Company proves were caused by (i) the Bank's willful misconduct or gross
negligence in determining whether documents presented under the Letter of
Credit comply with the terms of the Letter of Credit, or (ii) the Bank's
negligence in failing to make or willful failure to make lawful payment under
the Letter of Credit after the presentation to it by the Beneficiary of a
certificate strictly complying with the terms and conditions of the Letter of
Credit. In furtherance and not in limitation of the foregoing, the Bank may
accept documents that appear on their face to be in order, without
responsibility for further investigation, regardless of any notice or
information to the contrary.

         8.5.    COSTS AND EXPENSES. The Company agrees to pay on demand all
reasonable costs and out-of-pocket expenses (including reasonable counsel fees
and expenses) in connection with (i) the negotiation of this Agreement and the
issuance of the Letters of Credit, (ii) the custody or preservation of, or the
sale of, collection from, or other realization upon, any of the Collateral,
(iii) the enforcement of this Agreement or any other documents which may be
delivered in connection with this Agreement, and (iv) any action or proceeding
relating to any order, injunction, or other process or decree restraining or
seeking to restrain the Bank from paying any amount under the Letters of
Credit.

         8.6.    BINDING EFFECT; ASSIGNMENT. This Agreement shall be binding
upon and inure to the benefit of the Company and the Bank and their respective
successors and assigns, except that the Company shall not have the right to
assign its rights hereunder or any





                                      -18-
   19
interest herein without the prior written consent of the Bank. The Bank may
assign, negotiate, pledge or otherwise hypothecate all or any portion of this
Agreement, or grant participations herein, in the Letters of Credit or in any
of its rights or security hereunder to any Federal Reserve Bank or, with the
written consent of the Company, which consent shall not be unreasonably
withheld, to any other financial institution.

         8.7.    SUPERSEDING AGREEMENT. This Agreement supersedes any
commitment letters or other agreements between the Bank and the Company prior
to the date hereof relating to the subject matter hereof.

         8.8.    SEVERABILITY. Any provision of this Agreement which is
prohibited, unenforceable or not authorized in any jurisdiction shall, as to
such jurisdiction, be ineffective to the extent of such prohibition,
unenforceability or non-authorization without invalidating the remaining
provisions hereof or affecting the validity, enforceability or legality of such
provision in any other jurisdiction.

         8.9.    GOVERNING LAW. This Agreement shall be governed by and
construed in accordance with the laws of the State of New York. Unless
otherwise defined herein or in this Agreement, terms defined in Article 9 of
the Code are used herein as therein defined.

         8.10.   Consent to Jurisdiction; Waiver of Trial by Jury. THE BORROWER
IRREVOCABLY AND UNCONDITIONALLY (I) AGREES THAT ANY SUIT, ACTION OR OTHER LEGAL
PROCEEDING ARISING OUT OF THIS AGREEMENT MAY BE BROUGHT IN THE COURTS OF RECORD
OF THE STATE OF NEW YORK OR THE COURTS OF THE UNITED STATES LOCATED IN THE
STATE OF NEW YORK; (II) CONSENTS TO THE NON-EXCLUSIVE JURISDICTION OF EACH SUCH
COURT IN ANY SUCH SUIT, ACTION OR PROCEEDING; AND (III) WAIVES ANY OBJECTION
WHICH IT MAY HAVE TO THE LAYING OF VENUE OF ANY SUCH SUIT, ACTION OR PROCEEDING
IN ANY OF SUCH COURTS; AND IN ANY ACTION HEREUNDER THE BORROWER AND THE BANK
WAIVE THE RIGHT TO DEMAND A TRIAL BY JURY.

         8.11.   HEADINGS. The headings of the Sections of this Agreement are
for convenience only, and shall not control or affect the meaning or
construction of any of the terms or provisions of this Agreement. References in
this Agreement to Sections are references to Sections of this Agreement, unless
expressly stated to the contrary.





                                      -19-
   20
         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed and delivered by their respective officers thereunto duly
authorized as of the date first set forth above.

                                      CONTINENTAL NATURAL GAS, INC.


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


                                      CHRISTIANIA BANK,
                                            NEW YORK BRANCH


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


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





                                      -20-
   21



                                                                       EXHIBIT A

                        [Letterhead of Christiania Bank]

                                                                          [DATE]
                                         Irrevocable Letter of Credit No. [LOC#]

[BENEFICIARY]        
_____________________
_____________________


Gentlemen:

         The undersigned, Christiania Bank, a bank organized under the laws of
Norway (the "Bank"), acting through its New York Branch, hereby establishes, at
the request and for the account of [ACCOUNT PARTY] (the "Account Party"), in
your favor, its Irrevocable Letter of Credit No. [LOC#] in the amount of
___________________ U.S. Dollars ($_______________) (the "Stated Amount"),
pursuant to that certain Letter of Credit and Reimbursement Agreement, dated as
of December 27, 1996, as amended from time to time (the "Reimbursement
Agreement"), between the Account Party and the Bank.

         We hereby irrevocably authorize you to draw on us, in accordance with
the terms and conditions hereof, in one or more drawings from time to time, an
aggregate amount, in United States Dollars, not exceeding the Stated Amount,
with respect to the payment when due of money due and owing to you under that
certain _____________, dated as of _____, 19__, between the Account Party and
you. Each drawing honored by the Bank hereunder shall automatically reduce pro
tanto the amount available to be drawn hereunder by subsequent drawings. A
drawing under this Letter of Credit is available to you against your properly
endorsed sight draft drawn on and presented to the Bank, stating on its face
"Drawn under Christiania Bank, New York Branch, Irrevocable Letter of Credit
No. [LOC#]" and accompanied by your written and completed certificate, signed
by one who purports to be your duly authorized officer, containing one of the
following statements:

                 1.       "[ACCOUNT PARTY] (the "Account Party") is in default
         in the payment of money due and owing [BENEFICIARY] (the
         "Beneficiary") under that certain ____________, dated as of ________,
         199__, between the Account Party and the Beneficiary, in the amount of
         at least the face amount of the accompanying draft."

                                       OR

                 2.       "You have advised us in writing that the Letter of
         Credit referred to in the accompanying draft is being terminated by
         reason of the occurrence and continuance of an 'Event of Default'
         under the Reimbursement Agreement (as defined in the Letter of
         Credit)."





                                      A-1
   22




                                       OR

                 3.       "(A) [ACCOUNT PARTY] (the "Account Party") has not
         completed its obligations under that certain ____________, dated as of
         ________, 199__, between the Account Party and the Beneficiary, and
         (B) you have not advised us in writing at least 30 days prior to the
         expiration date of the Letter of Credit referred to in the
         accompanying draft that such Letter of Credit has not been extended
         for at least one year from the date of expiration thereof."

         A sight draft which exhausts funds drawable hereunder must be
accompanied by this Letter of Credit.

         Demand for payment may be made by you under this Letter of Credit, at
any time during the business hours of the Bank on a Business Day, at its New
York Branch located at 11 West 42nd Street, 7th Floor, New York, New York 10036
(or at any other office in the City of New York, New York that may be
designated by the Bank by written notice delivered to you). As used in this
Letter of Credit, the term "Business Day" shall mean a day other than a
Saturday, Sunday or other day on which banks in the City of New York, New York
are authorized or required by law or executive order to close.

         This Letter of Credit shall expire at the close of business of the
Bank at its New York Branch on the earliest to occur of the following dates
(the "Termination Date"): (i) ________, 199__; and (ii) the date on which no
further amount is available to be drawn under this Letter of Credit.

         This Letter of Credit is not transferable in whole or in part. Only
you may make a drawing under this Letter of Credit. Upon the payment to you, in
accordance with your payment instructions, of the amount specified in any draft
drawn under this Letter of Credit, we shall be fully discharged of our
obligation under this Letter of Credit with respect to such draft, and we shall
not thereafter be obligated to make any further payments under this Letter of
Credit in respect of such draft, to you or to any other person.

         This Letter of Credit shall be governed by the laws of the State of
New York including, without limitation, Article 5 of the Uniform Commercial
Code as in effect in the State of New York, and shall also, to the extent not
inconsistent with such Code, be governed by the Uniform Customs and Practice
for Documentary Credits (1993 Revision), International Chamber of Commerce
Publication No. 500.

         This Letter of Credit sets forth in full our undertaking, and such
undertaking shall not in any way be modified, amended, amplified or limited by
reference to any document, instrument or agreement referred to herein
(including, without limitation, the Reimbursement





                                      A-2
   23



Agreement), except for the drafts and the certificates referred to herein; and
any such reference shall not be deemed to incorporate herein by reference any
document, instrument or agreement except for such drafts and certificates.


                                        Very truly yours,

                                        CHRISTIANIA BANK,
                                               NEW YORK BRANCH

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





                                      A-3