TWENTIETH AMENDMENT TO FOURTH AMENDED AND RESTATED CREDIT AGREEMENT

SECTION 1. Amendments to Credit Agreement.  Subject to the satisfaction or waiver in writing of each condition precedent set forth in Section 3 of this Amendment, and in reliance on the representations, warranties, covenants and agreements contained in this Amendment, the Existing Agreement shall be amended in the manner provided in this Section 1.

1.1 Additional Definitions. The following definitions are hereby added to Section 1.01 of the Credit Agreement in appropriate alphabetical order:

1.2 Amended Definitions.  The following definitions in Section 1.01 of the Credit Agreement are hereby amended and restated in their entirety to read as follows:

1.3 Deleted Definition. The definition of “Seventeenth Amendment Effective Date” in Section 1.01 of the Credit Agreement shall be and it hereby is deleted in its entirety.

1.4 Hedging Contracts.  Section 7.03(e) of the Credit Agreement shall be and it hereby is amended by replacing the date “December 31, 2021” therein with “December 31, 2023”.

SECTION 2. Redetermination of Borrowing Base.  This Amendment shall constitute notice of the Redetermination of the Borrowing Base pursuant to Section 3.05 of the Credit Agreement, and the Administrative Agent, the Lenders, Borrower and the Guarantors hereby acknowledge that effective as of the Twentieth Amendment Effective Date, the Borrowing Base is $4,750,000,000, and such redetermined Borrowing Base shall remain in effect until the earlier of (i) the Scheduled Redetermination to occur on or about April 15, 2017 pursuant to Section 3.03 of the Credit Agreement and (ii) the date such Borrowing Base is otherwise adjusted pursuant to the terms of the Credit Agreement. For the avoidance of doubt, the redetermination of the Borrowing Base contained in this Section 2 constitutes the Scheduled Redetermination, which otherwise would have occurred on or about October 15, 2016 pursuant to Section 3.03 of the Credit Agreement.

SECTION 3. Conditions.  The amendments to the Existing Agreement contained in Section 1 of this Amendment shall be effective upon the satisfaction of each of the conditions set forth in this Section 3 (the "Twentieth Amendment Effective Date").

3.1 Execution and Delivery.  Each Credit Party, the Lenders and the Administrative Agent shall have executed and delivered this Amendment.

3.2 No Default.  No Default shall have occurred and be continuing or shall result from the effectiveness of this Amendment.

3.3 Certificates.  The Administrative Agent shall have received such documents and certificates as the Administrative Agent or its counsel may reasonably request relating to the organization, existence and good standing of each Credit Party, the authorization of this Amendment and the transactions contemplated hereby and any other legal matters relating to the Credit Parties, this Amendment or the transactions contemplated hereby, all in form and substance reasonably satisfactory to the Administrative Agent and its counsel.

3.4 Other Documents.  The Administrative Agent shall have received such other instruments and documents incidental and appropriate to the transactions provided for herein as the Administrative Agent or its special counsel may reasonably request, and all such documents shall be in form and substance reasonably satisfactory to the Administrative Agent.

SECTION 4. Representations and Warranties of Credit Parties.  To induce the Lenders to enter into this Amendment, each Credit Party hereby represents and warrants to the Lenders as follows:

4.1 Reaffirmation of Representations and Warranties/Further Assurances.  Both before and after giving effect to the amendments herein, each representation and warranty of such Credit Party contained in the Credit Agreement and in each of the other Loan Documents is true and correct in all material respects as of the date hereof (except to the extent such representations and warranties relate solely to an earlier date, in which case such representations and warranties shall have been true and correct in all material respects as of such date and any representation or warranty which is qualified by reference to “materiality” or “Material Adverse Effect” is true and correct in all respects).

4.2 Corporate Authority; No Conflicts.  The execution, delivery and performance by each Credit Party of this Amendment are within such Credit Party’s corporate or other organizational powers, have been duly authorized by necessary action, require no action by or in respect of, or filing with, any Governmental Authority and do not violate or constitute a default under any provision of any applicable law or other agreements binding upon any Credit Party or result in the creation or imposition of any Lien upon any of the assets of any Credit Party except for Permitted Liens and otherwise as permitted in the Credit Agreement.

4.3 Enforceability.  This Amendment constitutes the valid and binding obligation of Borrower and each other Credit Party enforceable in accordance with its terms, except as (i) the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditor’s rights generally, and (ii) the availability of equitable remedies may be limited by equitable principles of general application.

4.4 No Default.  As of the date hereof, both before and immediately after giving effect to this Amendment, no Default has occurred and is continuing.

SECTION 5. Miscellaneous.

5.1 Reaffirmation of Loan Documents and Liens.  Any and all of the terms and provisions of the Credit Agreement and the Loan Documents shall, except as amended and modified hereby, remain in full force and effect and are hereby in all respects ratified and confirmed by each Credit Party.  Borrower and each Guarantor hereby agrees that the amendments and modifications herein contained shall in no manner affect or impair the liabilities, duties and obligations of any Credit Party under the Credit Agreement and the other Loan Documents or the Liens securing the payment and performance thereof.

5.2 Parties in Interest.  All of the terms and provisions of this Amendment shall bind and inure to the benefit of the parties hereto and their respective successors and assigns.

5.3 Legal Expenses.  Each Credit Party hereby agrees to pay all reasonable fees and expenses of special counsel to the Administrative Agent incurred by the Administrative Agent in connection with the preparation, negotiation and execution of this Amendment and all related documents.

5.4 Counterparts.  This Amendment may be executed in one or more counterparts and by different parties hereto in separate counterparts each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same instrument; signature pages may be detached from multiple separate counterparts and attached to a single counterpart so that all signature pages are physically attached to the same document.  Delivery of photocopies of the signature pages to this Amendment by facsimile or electronic mail shall be effective as delivery of manually executed counterparts of this Amendment.

5.5 Complete Agreement.  THIS AMENDMENT, THE CREDIT AGREEMENT, AND THE OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

5.6 Headings.  The headings, captions and arrangements used in this Amendment are, unless specified otherwise, for convenience only and shall not be deemed to limit, amplify or modify the terms of this Amendment, nor affect the meaning thereof.

5.7 Governing Law.  This Amendment shall be construed in accordance with and governed by the laws of the State of New York.

5.8 Reference to and Effect on the Loan Documents.

(a)This Amendment shall be deemed to constitute a Loan Document for all purposes and in all respects.  Each reference in the Existing Agreement to “this Agreement,” “hereunder,” “hereof,” “herein” or words of like import, and each reference in the Existing Agreement or in any other Loan Document, or other agreements, documents or other instruments executed and delivered pursuant to the Existing Agreement to the “Credit Agreement”, shall mean and be a reference to the Existing Agreement as amended by this Amendment.

(b)The execution, delivery and effectiveness of this Amendment shall not operate as a waiver of any right, power or remedy of any Lender or Administrative Agent under any of the Loan Documents, nor constitute a waiver of any provision of any of the Loan Documents.