Document:

exv10w10

 

Exhibit 10.10

Integrated Electrical Services, Inc.

2006 Equity Incentive Plan

Option Award Agreement

          THIS OPTION AWARD AGREEMENT (“Agreement”) is
made and entered into as of May 16,
2006 (“Grant Date”) by and between Integrated Electrical Services, Inc., a Delaware
corporation (“Company”), and C. Byron Snyder (“Optionee”) pursuant to the terms and
conditions of the Integrated Electrical Services, Inc. 2006 Equity Incentive Plan (“Plan”).

SECTION 1. GRANT OF OPTION AWARD.

(a) Option Award. On the terms and conditions set forth in this Agreement and the Plan, the
Company grants to the Optionee on the Grant Date an option to purchase a number of Shares at the
Exercise Price, as set forth below. This option is intended to be a nonqualified stock option.

	 	 	 	 	 	 	 	 	 
	Tranche	 	Shares1	 	Exercise Price 	 	Vesting
	A

	 	 	29,412	 	 	the greater of
$15.002
or 150% of the Fair
Market Value of
Company common
stock on the Grant
Date
	 	See Section 2 herein
	 
	 	 	 	 	 	 	 	 
	B

	 	 	22,059	 	 	the greater of
$25.003
or 250% of the Fair
Market Value of
Company common
stock on the Grant
Date
	 	See Section 2 herein

(b) Equity Incentive Plan and Defined Terms. This option is granted under and subject to the
terms of the Plan, which is incorporated herein by reference. If there is any inconsistency
between the terms of the Plan and the terms of this Agreement, the Plan’s terms shall supersede and
replace the conflicting terms of this Agreement. Capitalized terms that are defined in the Plan
are incorporated herein by reference and other capitalized terms are defined in Section 9 of this
Agreement.

(c) Exercisability. Subject to the terms and conditions set forth in this Agreement and the Plan,
this option or a portion thereof may be exercised (i) prior to its expiration and (ii) on or

 

			
	1	 	The number of option shares assumes that, on
the grant date, 15,404,172 shares of Company common stock are outstanding,
including reserved restricted shares (which reflects the anticipated adjustment
in the Company common shares made in connection with the Chapter 11 plan). The
number of option shares shall be adjusted equitably upon any change in the
number of outstanding Company common shares as of the effective date of the
Chapter 11 Plan.
	 
	2	 	The exercise price assumes that, on the grant
date, 15,404,172 shares of Company common stock are outstanding, including
reserved restricted shares (which reflects the anticipated adjustment in the
Company common shares made in connection with the Chapter 11 plan). The
exercise price shall be adjusted equitably upon any change in the number of
outstanding Company common shares as of the effective date of the Chapter 11
Plan.
	 
	3	 	See Footnote 2 above.

 

 

after the time this option or a portion thereof is vested pursuant to the vesting provisions set
forth in Section 2 herein.

(d) Scope of this Agreement. This Agreement shall apply both to this option and to the Shares
acquired upon the exercise of this option.

SECTION 2. VESTING

(a) This option shall vest according to the following schedule:

	 	 	 
	Tranche	 	Vesting Schedule
	A

	 	100% vested on the Grant Date
	 
	 	 
	B

	 	100% vested if, on the ninetieth (90th) day after the grant
date (the “Retention Vesting Date”), at least 90% of the
presidents of the Company’s subsidiaries, as of February 13,
2006, are employed with the Company on the Retention Vesting
Date (excluding for purposes of such calculation such
presidents that are no longer employed by the Company or its
subsidiaries by reason of death, disability or termination by
the Board without cause on or prior to the Retention Vesting
Date)4

SECTION 3. TERM AND EXPIRATION.

(a) Basic Term. Subject to earlier termination as set forth herein, the exercise period of this
option shall expire ten (10) years after the Grant Date (the “Term”).

(b) Termination of Service (except for Cause). In the event Optionee’s Service terminates for any
reason other than for Cause, then this option to the extent vested as of the date of such
termination shall expire on the earliest of: (i) the expiration of the Term, (ii) twelve (12)
months following such termination as a result of death or Disability, and (iii) three (3) months
following such termination for any other reason, but if such termination is by the Company other
than for Cause, then the later of three (3) months following such termination and February 13,
2008. This option to the extent unvested as of the date of such termination shall immediately
expire and lapse upon such termination.

(c) Termination of Service (for Cause). In the event Optionee’s Service is terminated for Cause or
Cause exists on the date Optionee’s Service terminates, then this option on the date of such
termination (whether vested or unvested and including any exercised portion of this option for
which Shares have not been delivered to the Optionee) shall be cancelled and forfeited immediately
on the date of such termination, and the Company shall return to the Optionee the price (if any)
paid for such undelivered Shares. Should a Optionee die or have a Disability at a time when Cause
exists but prior to the date the Optionee’s Service is terminated for Cause, this option on the
date of such termination (whether vested or unvested and including any exercised portion of this
option for which Shares have not been delivered to the Optionee) shall be cancelled and forfeited
immediately as of the date of the Optionee’s death of Disability and the

 

			
	4	 	The list of the presidents of the
Company’s subsidiaries, as of February 13, 2006, is annexed herein as
Exhibit A.

2

 

Company shall return to the Optionee or Eligible Representative, as applicable, the price (if any)
paid for such undelivered Shares.

SECTION 4. TRANSFER OR ASSIGNMENT OF OPTION.

This option may not be transferred, assigned, pledged or hypothecated by any Optionee during the
Optionee’s lifetime, whether by operation of law or otherwise, or be made subject to execution,
attachment or similar process, except by beneficiary designation, will or the laws of descent and
distribution. Subject to the limitations contained herein, this option may be exercised during the
lifetime of the Optionee only by the Optionee or by the Optionee’s Eligible Representative. This
option shall not be transferable, except in the case of a transfer by the Optionee with the prior
written consent of the Committee in its sole discretion.

SECTION 5. EXERCISE.

(a) Exercise Procedure. An exercisable option, or any exercisable portion thereof, may be
exercised solely by delivery to the Secretary of the Company of all of the following prior to the
time when this option or such portion expires or is otherwise cancelled under the Plan or the
Agreement:

	 	(i)	 	Notice in writing signed by the holder or his or her Eligible Representative,
stating that this option or portion thereof is exercised, and specifically stating the
number of Shares with respect to which this option or a portion thereof is being
exercised;
	 
	 	(ii)	 	Full payment of the aggregate exercise price of the Shares with respect to
which this option (or portion thereof) is thereby exercised in accordance with any
method prescribed by Section 6 herein;
	 
	 	(iii)	 	The payment to the Company of all amounts necessary to satisfy any and all
federal, state and local tax withholding requirements arising in connection with the
exercise of this option (or a portion thereof) in accordance with any method prescribed
by the Plan and this Agreement; and
	 
	 	(iv)	 	Such representations and documents as the Committee deems necessary or
advisable to effect compliance with all applicable provisions of the Securities Act and
any other federal or state securities laws or regulations. The Committee may, in its
sole discretion, also take whatever additional actions it deems appropriate to effect
such compliance including, without limitation, placing legends on share certificates
and issuing stop-transfer orders to transfer agents and registrars.

In the event that this option or portion thereof shall be exercised pursuant to this Section 5 by
any person or persons other than the Optionee, appropriate proof of the right of such person or
persons to exercise this option or portion thereof shall be provided to the Company as a condition
to such exercise.

3

 

(b) Issuance of Shares. After completing the procedures set forth in Section 5, the Company shall
cause to be issued a certificate or certificates for the Shares as to which this option or a
portion thereof has been exercised, registered in the name of the person exercising this option or
a portion thereof (or in the names of such person and his or her spouse as community property or as
joint tenants with right of survivorship).

(c) Withholding Requirements. As a condition to the receipt or purchase of Shares pursuant to this
option, Optionee shall make such arrangements as the Committee may require for the satisfaction of
any federal, state, local or foreign withholding obligations that may arise in connection with such
receipt or purchase. The Optionee shall also make such arrangements as the Committee may require
for the satisfaction of any federal, state, local or foreign withholding obligations that may arise
in connection with the disposition of Shares acquired pursuant to this option.

SECTION 6. PAYMENT FOR SHARES

(a) Cash or Check. All or part of the Exercise Price and any applicable withholding requirements
may be paid in cash or by check.

(b) Alternative Methods of Payment. All or any part of the Exercise Price and any applicable
withholding requirements may be paid by one or more of the following methods:

     (i) Surrender of Shares. At the discretion of the Optionee, all or any part of the Exercise
Price and any applicable withholding requirements may be paid by surrendering, or attesting to the
ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to
the Company in good form for transfer and shall be valued at their Fair Market Value on the date
when the option or a portion thereof is exercised. Notwithstanding the foregoing, the Optionee
shall not surrender, or attest to the ownership of, Shares in payment of any portion of the
Exercise Price (or withholding) if such action would cause the Company or any Subsidiary to
recognize an additional compensation expense with respect to the option for financial reporting
purposes, unless the Committee consents thereto.

     (ii) Net Exercise. At the discretion of the Optionee, payment of all or any portion of the
Exercise Price and any applicable withholding requirements may be made by reducing the number of
Shares otherwise deliverable pursuant to the option by the number of such Shares having a Fair
Market Value equal to the Exercise Price and any applicable withholding requirement.
Notwithstanding the foregoing, the Optionee shall not be permitted to pay any portion of the
Exercise Price (or withholding) in such manner if such action would cause the Company or any
Subsidiary to recognize an additional compensation expense with respect to the option for financial
reporting purposes unless the Committee consents thereto.

     (iii) Exercise/Sale. Payment may be made in whole or in part by the delivery (on a form
prescribed by the Company) of an irrevocable direction (i) to a securities broker approved by the
Company to sell Shares and to deliver all or part of the sales proceeds to the Company, or (ii) to
pledge Shares to a securities broker or lender approved by the Company as security for a

4

 

loan, and to deliver all or part of the loan proceeds to the Company, in each case in payment
of all or part of the Exercise Price and any withholding requirements.

Should the Committee exercise its discretion to permit the Optionee to exercise this option in
whole or in part in accordance with this Section 6(b) above, it shall have no obligation to permit
such alternative exercise with respect to the remainder of this option or with respect to any other
option to purchase Shares held by the Optionee.

SECTION 7. ADJUSTMENT OF SHARES.

In the event of a Recapitalization, an adjustment shall be made to this option such that the option
shall thereafter be exercisable or payable, as the case may be, in such securities, cash and/or
other property as would have been received in respect of Shares subject to the option had the
option been exercised immediately prior to such Recapitalization and such an adjustment shall be
made successively each time any such change shall occur. In addition, in the event of any
Recapitalization, to prevent dilution or enlargement of Optionee’s rights hereunder, the Committee
shall, and will have the authority to adjust, in a fair and equitable manner, the Exercise Price
and the number and kind of shares subject to this option. Should the vesting of this option be
conditioned upon the Company’s attainment of performance conditions, the Committee may make such
adjustments to such terms and conditions of this option and the criteria therein to recognize
unusual and nonrecurring events affecting the Company or in response to changes in applicable laws,
regulations or accounting principles.

SECTION 8. MISCELLANEOUS PROVISIONS.

(a) Notification. Any notification required by the terms of this Agreement shall be given in
writing and shall be deemed effective upon personal delivery or upon deposit with the United States
Postal Service, by registered or certified mail, with postage and fees prepaid. A notice shall be
addressed to the Company at its principal executive office and to the Optionee at the address that
he or she most recently provided to the Company.

(b) Rights as a Shareholder. Neither the Optionee nor the Optionee’s representative shall have any
rights as a shareholder with respect to any Shares subject to this option until the Optionee or the
Optionee’s representative becomes entitled to receive such Shares by satisfaction of the exercise
procedures set forth herein.

(c) Tenure. Nothing in the Plan or the Agreement shall confer upon a Optionee any right to
continue in Service for any period of specific duration or interfere with or otherwise restrict in
any way the rights of the Company (or any Subsidiary employing or retaining the Optionee) or of the
Optionee, which rights are hereby expressly reserved by each, to terminate his or her Service at
any time and for any reason, with or without Cause.

(d) Entire Agreement. This Agreement and the Plan constitute the entire contract between the
parties hereto with regard to the subject matter hereof. They supersede any other agreements,
representations or understandings (whether oral or written and whether express or implied) which
relate to the subject matter hereof.

5

 

(e) Waiver. No waiver of any breach or condition of this Agreement shall be deemed to be a waiver
of any other or subsequent breach or condition whether of like or different nature.

(f) Successors and Assigns. The provisions of this Agreement shall inure to the benefit of, and be
binding upon, the Company and its successors and assigns and upon the Optionee, the Optionee’s
assigns and the legal representatives, heirs and legatees of the Optionee’s estate, whether or not
any such person shall have become a party to this Agreement and have agreed in writing to be join
herein and be bound by the terms hereof.

(g) Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws
of the State of Delaware, as such laws are applied to contracts entered into and performed in such
State.

SECTION 9. DEFINITIONS.

(a) “Agreement” shall mean this Option Award Agreement.

(b) “Exercise Price” shall mean the price paid by the Optionee (or as applicable, the
Eligible Representative) for the Shares under this option.

(c) “Grant Date” shall have the meaning ascribed to such term in the introduction of this
Agreement.

(d) “Optionee” shall have the meaning ascribed to such term in the introduction of this
Agreement.

(e) “Service” shall mean service as an Employee, Director or Consultant. For any purpose
under this Agreement, Service shall be deemed to continue while the Optionee is on a bona fide
leave of absence, if such leave was approved by the Company in writing or if continued crediting of
Service for such purpose is expressly required by the terms of such leave or by applicable law (as
determined by the Committee). For the avoidance of doubt, Optionee’s service to the Company and
its Subsidiaries as a consultant pursuant to the Employment and Consulting Agreement dated as of
[insert Chapter 11 effective date] shall constitute Service for purposes of this Agreement.

(f) “Term” shall have the meaning ascribed to such term in Section 3(a) herein.

6

 

By signing below, the Optionee accepts this award, and acknowledges and agrees that this Award is
granted under and governed by the terms and conditions of the Integrated Electrical Services, Inc.
2006 Equity Incentive Plan and the Option Award Agreement.

	 	 	 	 	 	 	 	 	 
	 

	 	 	 	 	 	 	 	 
	Optionee:	 	 	 	Integrated Electrical Services, Inc.	 	 
	 
	 	 	 	 	 	 	 	 
	/s/ C. Byron Snyder

	 	 	 	By:
	 	     /s/ Curt L. Warnock	 	 
	 

	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	Title:
	 	 Senior Vice President and General Counsel	 	 

7

 

EXHIBIT A

	 	 	 	 	 	 	 	 	 
	Region	 	Company 	 	First_Name	 	Last_Name	 	 
	CENTRAL

	 	Bexar Electric Ltd.
	 	Bobby
	 	Neuse
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Gray Electric, Pollock Summit, 
Tesla Power
	 	Nat
	 	Wrotenbery
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Kayton Electric, Inc.
	 	Teddy E
	 	Kayton
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Menninga Electric, Inc.
	 	Norman
	 	Vos
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Mills Electric LP
	 	Dale
	 	Payne
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Neal Electric of Austin
	 	Paul
	 	Carl
	 	President
	 
	 	 	 	 	 	 	 	 
	CENTRAL

	 	Riviera Electric
	 	Lynn
	 	Martin
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	ARC Electric, Inc.
	 	Robert
	 	Warwick
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Bryant Electric Company, Inc.
	 	Jose
	 	Suarez
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Commercial Electrical
Contractors, Inc.
	 	John
	 	Duquette
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Mid-States Electric Company,
Inc.
	 	Robert (“Robbie”)
	 	Aspden
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Newcomb Electric Company,
Inc.
	 	Richard A
	 	Newcomb
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Pan American Electric, Inc.
	 	David
	 	Dorris
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Paulin Electric, Inc.
	 	Stanley (“Butch”)
	 	Paulin
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Primo/PrimeNet
	 	Craig
	 	DiGregorio
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Thomas Popp & Company
	 	Bill
	 	Beischel
	 	President
	 
	 	 	 	 	 	 	 	 
	NORTH

	 	Valentine Electrical, Inc.
	 	Michael H
	 	Valentine
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Aladdin-Ward Electric & Air,
Inc.
	 	David
	 	Hicks
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Amber Electric, Inc.
	 	Roger
	 	Scroggins
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Daniel Electrical
Contractors, Inc.
	 	Anthony D
	 	Gervasio, Sr.
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Davis Electrical
Constructors, Inc.
	 	William
	 	Byrd
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Haymaker
	 	Carmon
	 	Colvin
	 	President
	 
	 	 	 	 	 	 	 	 
	SOUTH

	 	Mark Henderson
	 	(Open)
	 	 	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Cross State Electric, Inc.
	 	Donn
	 	Cross
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Electro-Tech, Inc.
	 	Michael J
	 	Bertoldi
	 	President

8

 

	 	 	 	 	 	 	 	 	 
	Region	 	Company 	 	First_Name	 	Last_Name	 	 
	WEST

	 	Federal Communications
Group, Inc.
	 	Don
	 	Fishstein
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Hatfield-Reynolds Electric
Co., Inc.
	 	Claude (“Ernie”)
	 	Reynolds
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Mitchell Electric Company,
Inc.
	 	Michael
	 	Hession
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Murray Electrical
Contractors, Inc.
	 	Gary
	 	Swanson
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	New Tech Electric
	 	Wade
	 	Parkin
	 	President
	 
	 	 	 	 	 	 	 	 
	WEST

	 	Rodgers Electric *
	 	Dan
	 	Stevens
	 	General Manager
	 
	 	 	 	 	 	 	 	 
	RES

	 	Houston-Stafford Electrical,
Inc.
	 	Butch
	 	Paschal
	 	President
	 
	 	 	 	 	 	 	 	 
	RES

	 	Key Electrical Supply, Inc.
	 	Mark
	 	Jensen
	 	President

 

			
	*	 	Rodgers Electric was “tucked-in” to Murray Electrical for reporting purposes.

9exv10w1

 

Exhibit 10.1

PURCHASE AND SALE AGREEMENT

by and between

NOBLE ENERGY, INC.

and

COLDREN RESOURCES LP

dated

May 15, 2006

 

 

TABLE OF CONTENTS

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	PAGE	 
	ARTICLE 1	 	PURCHASE AND SALE
	 	 	1	 
	 	1.1	 	 	Purchase and Sale of Assets
	 	 	1	 
	 	1.2	 	 	Entech Properties
	 	 	2	 
	ARTICLE 2	 	PURCHASE PRICE
	 	 	3	 
	 	2.1	 	 	Purchase Price; Method of Payment; Deposit
	 	 	3	 
	 	2.2	 	 	Adjustments to Purchase Price
	 	 	4	 
	 	2.3	 	 	Payment and Calculation of Estimated Adjusted Purchase Price and
Payment at Closing
	 	 	5	 
	 	2.4	 	 	Like-Kind Exchange Option
	 	 	6	 
	 	2.5	 	 	Post-Closing Adjustment
	 	 	6	 
	ARTICLE 3	 	TITLE AND ENVIRONMENTAL MATTERS
	 	 	6	 
	 	3.1	 	 	Title Due Diligence
	 	 	6	 
	 	3.2	 	 	Environmental Due Diligence
	 	 	10	 
	 	3.3	 	 	Notice of Breaches of Representations and Warranties Pre-Closing
	 	 	12	 
	 	3.4	 	 	Adjustments to Purchase Price for Title Defects, Environmental Defects
and Breaches of Representations and Warranties
	 	 	12	 
	 	3.5	 	 	Deferred Claims and Disputes
	 	 	12	 
	 	3.6	 	 	Option to Cure Title Defects Post-Closing
	 	 	13	 
	 	3.7	 	 	Limited Warranty of Title
	 	 	14	 
	 	3.8	 	 	Notices to Holders of Preferential Purchase Rights
	 	 	14	 
	 	3.9	 	 	Exercise of Preferential Purchase Rights
	 	 	15	 
	 	3.10 	 	Consents to Assignment
	 	 	15	 
	 	3.11 	 	Casualty Loss
	 	 	16	 
	ARTICLE 4	 	REPRESENTATIONS AND WARRANTIES OF NOBLE
	 	 	16	 
	 	4.1	 	 	Existence
	 	 	16	 
	 	4.2	 	 	Power
	 	 	16	 
	 	4.3	 	 	Authorization
	 	 	16	 
	 	4.4	 	 	Brokers
	 	 	17	 
	 	4.5	 	 	Foreign Person
	 	 	17	 
	 	4.6	 	 	Litigation
	 	 	17	 
	 	4.7	 	 	Material Contracts
	 	 	17	 
	 	4.8	 	 	No Violation of Laws
	 	 	18	 
	 	4.9	 	 	Royalties, Etc
	 	 	18	 

i

 

TABLE OF CONTENTS
(CONTINUED)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	PAGE	 
	 	4.10	 	 	Personal Property
	 	 	18	 
	 	4.11	 	 	Consents
	 	 	19	 
	 	4.12	 	 	Preferential Rights
	 	 	19	 
	 	4.13	 	 	Current Commitments
	 	 	19	 
	 	4.14	 	 	Environmental Orders/Notices
	 	 	19	 
	 	4.15	 	 	Gas Prepayment Arrangements; Take-or-Pay
	 	 	19	 
	 	4.16	 	 	Production Taxes
	 	 	19	 
	 	4.17	 	 	Leases
	 	 	20	 
	 	4.18	 	 	Well Status
	 	 	20	 
	 	4.19	 	 	Suspense
	 	 	20	 
	 	4.20	 	 	Additional Representations and Warranties
	 	 	20	 
	ARTICLE 5	 	REPRESENTATIONS AND WARRANTIES OF PURCHASER
	 	 	20	 
	 	5.1 	 	 	Existence
	 	 	20	 
	 	5.2	 	 	Power
	 	 	20	 
	 	5.3	 	 	Authorization
	 	 	21	 
	 	5.4	 	 	Brokers
	 	 	21	 
	 	5.5	 	 	Further Distribution
	 	 	21	 
	 	5.6	 	 	Financial Statements
	 	 	21	 
	 	5.7	 	 	Matters Affecting United States Minerals Management Service Approval
	 	 	21	 
	 	5.8	 	 	Purchaser Financing
	 	 	22	 
	 	5.9	 	 	Bankruptcy Proceedings
	 	 	22	 
	 	5.10 	 	Additional Representations and Warranties
	 	 	22	 
	ARTICLE 6	 	PRE-CLOSING OBLIGATIONS OF NOBLE
	 	 	22	 
	 	6.1	 	 	Operations
	 	 	22	 
	 	6.2	 	 	HSR Act
	 	 	23	 
	ARTICLE 7	 	PRE-CLOSING OBLIGATIONS OF PURCHASER
	 	 	23	 
	 	7.1	 	 	Confidentiality
	 	 	23	 
	 	7.2	 	 	Return of Data
	 	 	24	 
	 	7.3	 	 	Notice of Certain Title Matters and Imbalance
	 	 	24	 
	 	7.4	 	 	Indemnity Regarding Access
	 	 	24	 
	 	7.5	 	 	HSR Act
	 	 	25	 
	ARTICLE 8	 	NOBLE’S CONDITIONS OF CLOSING
	 	 	25	 

ii

 

TABLE OF CONTENTS
(CONTINUED)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	PAGE	 
	 	8.1	 	 	Representations and Warranties
	 	 	25	 
	 	8.2	 	 	Performance
	 	 	25	 
	 	8.3	 	 	Officer or Attorney-in-Fact Certificate
	 	 	25	 
	 	8.4	 	 	Operatorship Forms
	 	 	25	 
	 	8.5	 	 	Bonds
	 	 	25	 
	 	8.6	 	 	Insurance
	 	 	25	 
	 	8.7	 	 	Certificate of Authority
	 	 	25	 
	 	8.8	 	 	Exemption Certificates
	 	 	26	 
	 	8.9	 	 	HSR Act
	 	 	26	 
	 	8.10 	 	Casualty Loss or Condemnation
	 	 	26	 
	 	8.11 	 	Purchase Price Adjustments
	 	 	26	 
	ARTICLE 9	 	PURCHASER’S CONDITIONS OF CLOSING
	 	 	26	 
	 	9.1	 	 	Representations and Warranties
	 	 	26	 
	 	9.2	 	 	Performance
	 	 	26	 
	 	9.3	 	 	Officer or Attorney-in-Fact Certificate
	 	 	26	 
	 	9.4	 	 	Litigation
	 	 	26	 
	 	9.5	 	 	Certificate of Authority
	 	 	27	 
	 	9.6	 	 	Operatorship Forms
	 	 	27	 
	 	9.7	 	 	HSR Act
	 	 	27	 
	 	9.8	 	 	Casualty Loss
	 	 	27	 
	 	9.9	 	 	Purchase Price Adjustments
	 	 	27	 
	ARTICLE 10	 	CLOSING
	 	 	27	 
	 	10.1 	 	Time and Place of Closing
	 	 	27	 
	 	10.2 	 	Closing Obligations
	 	 	27	 
	 	10.3 	 	Post Closing Obligations
	 	 	28	 
	ARTICLE 11	 	ADDITIONAL AGREEMENTS
	 	 	28	 
	 	11.1 	 	Calculation of Adjusted Purchase Price
	 	 	28	 
	 	11.2 	 	Suspended Funds
	 	 	29	 
	 	11.3 	 	Receipts and Credits
	 	 	29	 
	 	11.4 	 	Assumption of Liabilities; Cross Indemnity
	 	 	29	 
	 	11.5 	 	Imbalances
	 	 	33	 
	 	11.6 	 	Transition Agreement
	 	 	34	 

iii

 

TABLE OF CONTENTS
(CONTINUED)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	PAGE	 
	 	11.7	 	 	Further Assurances
	 	 	34	 
	 	11.8	 	 	Material Contracts
	 	 	34	 
	 	11.9	 	 	Marketing Contracts and Calls on Production
	 	 	34	 
	 	11.10 	 	Gas Processing Arrangement
	 	 	34	 
	 	11.11 	 	Payout Balances
	 	 	34	 
	 	11.12 	 	Employee and Benefit Matters
	 	 	34	 
	 	11.13 	 	Amendment of Schedules
	 	 	36	 
	 	11.14 	 	Gas Processing
	 	 	36	 
	 	11.15 	 	Description of Parties’ Intent
	 	 	36	 
	ARTICLE 12	 	TERMINATION
	 	 	36	 
	 	12.1	 	 	Right of Termination
	 	 	36	 
	 	12.2	 	 	Effect of Termination
	 	 	37	 
	ARTICLE 13	 	TAXES
	 	 	37	 
	 	13.1	 	 	Apportionment of Ad Valorem and Property Taxes
	 	 	37	 
	 	13.2	 	 	Sales Taxes
	 	 	37	 
	 	13.3	 	 	Other Taxes
	 	 	38	 
	 	13.4	 	 	Cooperation
	 	 	38	 
	ARTICLE 14	 	DOCUMENT RETENTION
	 	 	38	 
	 	14.1	 	 	Inspection
	 	 	38	 
	 	14.2	 	 	Destruction
	 	 	39	 
	ARTICLE 15	 	INDEPENDENT INVESTIGATION AND DISCLAIMER
	 	 	39	 
	 	15.1	 	 	Independent Investigation and Disclaimer
	 	 	39	 
	ARTICLE 16	 	ENVIRONMENTAL INDEMNITY
	 	 	40	 
	 	16.1	 	 	Physical and Environmental Conditions
	 	 	40	 
	 	16.2	 	 	General Environmental Indemnity
	 	 	40	 
	ARTICLE 17	 	MISCELLANEOUS
	 	 	41	 
	 	17.1	 	 	Dispute Resolution
	 	 	41	 
	 	17.2	 	 	Governing Law
	 	 	43	 
	 	17.3	 	 	Entire Agreement
	 	 	43	 
	 	17.4	 	 	Waiver
	 	 	44	 
	 	17.5	 	 	Captions
	 	 	44	 
	 	17.6	 	 	Assignment
	 	 	44	 

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TABLE OF CONTENTS
(CONTINUED)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	PAGE	 
	 	17.7	 	 	Notices
	 	 	44	 
	 	17.8	 	 	Expenses
	 	 	46	 
	 	17.9	 	 	Severability
	 	 	46	 
	 	17.10 	 	Publicity
	 	 	46	 
	 	17.11 	 	Use of Noble’s Name
	 	 	46	 
	 	17.12 	 	Consequential Damages
	 	 	46	 
	 	17.13 	 	No Third-Party Beneficiary
	 	 	46	 
	 	17.14 	 	Survival; Limitation of Liability
	 	 	46	 
	 	17.15 	 	Counterparts and Exhibits
	 	 	47	 
	 	17.16 	 	Operatorship Matters
	 	 	47	 
	 	17.17 	 	Conflict With Assignment
	 	 	48	 
	 	17.18 	 	DTPA Waiver
	 	 	48	 
	 	17.19 	 	Redhibition Waiver
	 	 	48	 
	 	17.20 	 	UTPCPL Waiver
	 	 	48	 
	 	17.21 	 	Recordation
	 	 	48	 
	 	17.22 	 	MMS Approval
	 	 	49	 
	 	17.23 	 	Additional Documents and Actions
	 	 	49	 
	 	17.24 	 	Cooperation in Connection with Regulatory Filings
	 	 	49	 
	ARTICLE 18	 	DEFINITIONS AND REFERENCES
	 	 	50	 
	 	18.1	 	 	Certain Defined Terms
	 	 	50	 
	 	18.2	 	 	Certain Additional Defined Terms
	 	 	52	 

	 	 	 	 	 
	Exhibits:
	 	 	 	 
	Exhibit “A”

	 	—
	 	Leasehold Interests
	Exhibit “A-1”

	 	—
	 	Wells
	Exhibit “A-2”

	 	—
	 	Orders and Contracts
	Exhibit “A-3”

	 	—
	 	Rights-of-Way, Easements, etc.
	Exhibit “A-4”

	 	—
	 	Platforms
	Exhibit “B”

	 	—
	 	Excluded Assets
	Exhibit “C”

	 	—
	 	Entech Properties
	Exhibit “C-1”

	 	—
	 	Entech Wells

v

 

	 	 	 	 	 
	Schedules:
	 	 	 	 
	Schedule 2.4(a)

	 	—
	 	Form of Assignment of Purchase and Sale Agreement
	Schedule 3.1(c)

	 	—
	 	Allocated Value
	Schedule 3.9

	 	—
	 	Form of Preferential Purchase Right Election Letter
	Schedule 4.6

	 	—
	 	Litigation Assumed by Purchaser
	Schedule 4.7

	 	—
	 	Defaults
	Schedule 4.8

	 	—
	 	Violation of Laws
	Schedule 4.9

	 	—
	 	Royalties
	Schedule 4.10

	 	—
	 	Personal Property
	Schedule 4.11

	 	—
	 	Consents
	Schedule 4.12

	 	—
	 	Preferential Purchase Rights
	Schedule 4.13

	 	—
	 	Current Commitments
	Schedule 4.14(a)

	 	—
	 	Environmental Orders
	Schedule 4.14(b)

	 	—
	 	Environmental Notices
	Schedule 4.16

	 	—
	 	Production Taxes
	Schedule 4.17

	 	—
	 	Leases
	Schedule 4.18

	 	—
	 	Well Status
	Schedule 4.19

	 	—
	 	Suspense Funds
	Schedule 8.6

	 	—
	 	Purchaser’s Insurance
	Schedule 10.2(a)(1)

	 	—
	 	Assignment and Bill of Sale (Texas)
	Schedule 10.2(a)(2)

	 	—
	 	Assignment and Bill of Sale (Louisiana)
	Schedule 10.2(a)(3)

	 	—
	 	Assignment and Bill of Sale (Mississippi)
	Schedule 10.2(a)(4)

	 	—
	 	Assignment and Bill of Sale (Alabama)
	Schedule 10.2(a)(5)

	 	—
	 	Assignment and Bill of Sale (Record Title)
	Schedule 10.2(a)(6)

	 	—
	 	Assignment and Bill of Sale (Operating Rights)
	Schedule 11.6

	 	—
	 	Transition Agreement
	Schedule 11.9

	 	—
	 	Marketing Contracts and Calls on Production
	Schedule 11.11

	 	—
	 	Payout Balances

vi

 

PURCHASE AND SALE AGREEMENT

     This Purchase and Sale Agreement (“Agreement”) is made and entered into this the 15th day of
May 2006, by and between NOBLE ENERGY, INC., a Delaware corporation (“Noble”), and COLDREN
RESOURCES LP, a Delaware limited partnership (“Purchaser”). Noble and Purchaser are sometimes
hereinafter referred to collectively as the “Parties” and individually as a “Party”.

     WHEREAS, Noble desires to sell to Purchaser, and Purchaser desires to purchase from Noble,
certain oil and gas properties and related assets on the terms and conditions set forth in this
Agreement;

     NOW, THEREFORE, for and in consideration of the premises and of the mutual covenants and
agreements contained herein, Noble and Purchaser hereby agree as follows:

ARTICLE 1

PURCHASE AND SALE

     1.1 Purchase and Sale of Assets. On the Closing Date, but effective as of 7:00 a.m.
Central Time, March 1, 2006 (the “Effective Time”), subject to the terms and conditions of this
Agreement, Noble agrees to sell and convey to Purchaser, and Purchaser agrees to purchase and pay
for, all of Noble’s right, title and interest in and to the following properties and related assets
(collectively, the “Assets”):

          (a) The oil, gas and mineral leasehold estates described in Exhibit “A”, together with
all of Noble’s rights in respect of any pooled, communitized or unitized acreage of which any such
interest is a part (collectively, the “Leasehold Interests”);

          (b)
(i) all wells, including, but not limited to, the wells
described in Exhibit “A-1”
(the “Wells”), equipment, pipelines, flowlines and facilities (including the platforms described on
Exhibit “A-4” (the “Platforms”)), that are located on and used directly in connection with
the production or treatment of oil and gas from the Leasehold Interests or that are located off the
Leasehold Interests but used directly in connection with the production or treatment of oil and gas
from the Leasehold Interests, (ii) all Hydrocarbon volumes attributable to the Leasehold Interests
and produced on or after the Effective Time, (iii) to the extent same are assignable or
transferable by Noble without restriction under Applicable Law or third-party agreements (without
the payment of any funds or other consideration), all orders, contracts, agreements and other
instruments (other than instruments subject or relating to attorney/client privilege, and
production sales agreements with any Affiliates or divisions of Noble, which will be terminated
effective as of the Closing Date), which are described in
Exhibit “A-2”   (collectively, the
“Orders and Contracts”), (iv) to the extent same are assignable or transferable by Noble under
Applicable Law or third-party agreements (without the payment of any funds or other consideration),
all rights-of-way, easements, authorizations, permits and similar rights and interests that are
used directly in connection with the operation of the Assets which are described in Exhibit
“A-3”, and (v) all other rights, privileges, benefits, powers and obligations conferred or
imposed upon the owner and holder of the Leasehold Interests; and

1

 

          (c) To the extent same are attributable or allocable to the Leasehold Interests and not
subject or relating to attorney/client privilege or a third party restriction on disclosure and
such restriction is not removed or otherwise satisfied, originals, to the extent available, or, if
originals are not available to Noble, copies of the following records: (i) lease and land records,
(ii) development geological records, (iii) operations, production and engineering records, (iv)
facility and well records, and (v) to the extent requested by Purchaser and to the extent Noble is
reasonably capable of providing same, certain data base information, in each case excluding any
exploration geological records, any geophysical data, any interpretive or forecast data, and any
such records or data that are not assignable pursuant to the terms of Applicable Law or third party
agreements (without the payment of any funds or other consideration) (collectively, the “Records”);

     The Parties acknowledge that the Parties intend that, pursuant to this Agreement, Noble shall
convey and Purchaser shall purchase, except for the Excluded Assets, any and all of Noble’s right,
title, and interest in the leases described on Exhibit “A”, including all of Noble’s right,
title and interest in and to all depths associated with the leases described on Exhibit
“A”.

     SAVE AND EXCEPT, and the Assets shall not include, the assets and properties described in
Exhibit “B” and any other assets and properties excluded pursuant to the terms hereof (the
“Excluded Assets”).

     1.2 Entech Properties. Pursuant to that certain Amended and Restated Participation
Agreement dated December 27, 1993 by and between Noble (formerly known as Energy Development
Corporation) and Entech Enterprises, Inc. (“Entech”), Noble assigned five percent (5%) of its
interest in the properties identified on Exhibit
“C” and Exhibit “C-1” to Entech.
Entech has not divested itself of its interest in said properties. Under the Amended and Restated
Participation Agreement, in the event that Noble receives an offer from a third party to purchase
all or a portion of its interest in the properties identified on Exhibit “C” and
Exhibit “C-1”, Entech shall have the right to cause Noble to purchase Entech’s interest in
such properties or cause said interest to be purchased on the same terms and conditions applicable
to the sale of Noble’s interest. Accordingly, upon execution of this Agreement, Noble will give
Entech written notice of the proposed price and all of the pertinent terms and conditions of the
proposed sale, and Noble shall promptly provide Purchaser with a copy of all correspondence sent to
or received from Entech with respect thereto. Should Entech elect to sell its interests, Purchaser
hereby agrees that it shall negotiate in good faith an agreement to purchase the Entech interests
from Entech on the same terms and conditions applicable to the sale of Noble’s interest hereunder
(proportionately reduced as is commensurate with the price to be paid for the Entech interests).
The Entech interest will be priced on the same basis as Noble’s interests and the purchase thereof
will be subject to the same terms and conditions as Noble’s interests (proportionately reduced as
is commensurate with the price to be paid for the Entech interests).

2

 

ARTICLE 2

PURCHASE PRICE

     2.1 Purchase Price; Method of Payment; Deposit.

          (a) The purchase price for the Assets shall be $625,000,000 (the “Purchase Price”), which
amount shall be adjusted as provided in Section 2.2.

          (b) All amounts required under this Article 2 to be paid by any Party to the other Party shall
be made by wire transfer of immediately available funds to an account designated by the payee
thereof, which designation shall be made not later than two (2) Business Days prior to the date
such payment is due.

          (c) On May 16, 2006, Purchaser shall deliver to JPMorgan Chase Bank, N.A. (the “Escrow
Agent”), an amount equal to $20,000,000, and Purchaser shall deliver an additional $30,000,000 to
the Escrow Agent within twelve (12) Business Days after the date hereof pursuant to that certain
letter guarantee of even date herewith from First Reserve Fund X, L.P. (collectively, the
“Deposit”).

          (d) The Deposit shall be held by the Escrow Agent and distributed as follows:

               (i) if this Agreement is terminated by mutual consent of the Parties as provided in Section
12.1(a), the Deposit shall be returned by the Escrow Agent to Purchaser;

               (ii) if this Agreement is terminated by either Party pursuant to the termination right
provided in Article 12 and at such time Noble has not performed in all material respects its
obligations hereunder or has materially breached any representation and warranty, and has been
unwilling or unable to perform, and Purchaser has performed, or has been willing and able to
perform, in all material respects the obligations to be performed by it at or prior to Closing (and
Noble’s failure is not due to a breach by Purchaser of its obligations hereunder), Purchaser shall
have the right to have the Deposit returned by the Escrow Agent to Purchaser; or as an alternative
to termination under Article 12, Purchaser shall have the right to specific performance;

               (iii) if this Agreement is terminated by either Party pursuant to the termination right
provided in Article 12 and at such time Noble has performed, or been willing and able to perform,
in all material respects its obligations hereunder and Purchaser has been unwilling or unable to
perform, or has materially breached any representation or warranty by Purchaser or failed to
perform in all material respects the obligations to be performed by it at or prior to Closing (and
Purchaser’s failure is not due to a breach by Noble of its obligations hereunder), Noble shall have
the right to have the Deposit released by the Escrow Agent to Noble as liquidated damages, in which
case Noble shall be free immediately to enjoy all rights of ownership of the Assets, and to sell,
transfer, encumber or otherwise dispose of the Assets to any third party without restriction under
this Agreement;

               (iv) if this Agreement is terminated and neither Party is in material default hereunder, the
Deposit will be returned by the Escrow Agent to Purchaser; and

3

 

               (v) if Closing occurs, Noble shall (or shall cause the Escrow Agent to) (A) if Noble has
elected to effect a like-kind exchange pursuant to Section 2.4, (1) return the Deposit to Purchaser
or (2) if Purchaser so directs in writing, transfer the Deposit to the qualified escrow/trust
account or (B) if Noble has not elected to effect a like-kind exchange pursuant to Section 2.4,
apply the Deposit towards the Purchase Price.

          (e) Purchaser and Noble will enter into a form of escrow agreement (the “Deposit Escrow
Agreement”) simultaneously with the execution of this Agreement setting forth the specific terms
regarding the Deposit, including directing the Escrow Agent to invest the Deposit in an
interest-bearing account and providing that the Party entitled to receive the Deposit under this
Agreement shall also be entitled to receive all interest earned thereon.

          (f) Purchaser further acknowledges and agrees that if Noble becomes entitled to the Deposit
pursuant to the provisions of Section 2.1(d)(iii), Noble’s damages under such circumstances would
be difficult to ascertain and Noble shall be entitled to liquidated damages in an amount equal to
the Deposit. Accordingly, the delivery to Noble of the Deposit as provided in Section 2.1(d)(iii)
above shall be deemed to constitute the payment by Purchaser to Noble of such liquidated damages,
but in no event shall such delivery of the Deposit as payment of liquidated damages constitute or
be construed as a penalty.

     2.2 Adjustments to Purchase Price. The Purchase Price for the Assets shall be
adjusted as follows (the resulting amount being herein referred to as the “Adjusted Purchase
Price”):

          (a) The Purchase Price shall be increased by an amount equal to the sum of the following
amounts:

               (i) the amount of all expenses (net to Noble’s interest) incurred and paid or to be paid by or
on behalf of Noble that are attributable to the ownership or operation of the Assets and to the
period of time from and after the Effective Time, including without limitation, capital
expenditures, royalties, ad valorem, property and similar taxes and assessments, severance, sales
and production taxes (but excluding income taxes and franchise taxes), rentals and similar charges,
amounts billed under applicable operating agreements and prepaid expenses, but excluding all costs
and expenses associated with litigation for which Noble expressly retains liability in this
Agreement as described in Section 11.4(c);

               (ii) the amount equal to the aggregate sum of the Allocated Value of each Asset designated
with a negative value that is either (A) purchased by a holder of a preferential purchase right
covering such Asset as contemplated in Section 3.9, (B) held back from the Closing pursuant to
Section 3.9 or 3.10 or (C) excluded from this Agreement pursuant to Section 3.2(c) or Section 3.11;

               (iii) an amount equal to the sum of four and 50/100 dollars ($4.50) per mcf, less royalties,
overrides and taxes, that the total amount of net underproduction of the Assets reflect an
Imbalance in excess of 2.1 bcf of gas; and

4

 

               (iv) an amount equal to the sum of all amounts for which Noble is entitled to receive a
Purchase Price increase pursuant to Section 3.1(f).

               (b) The Purchase Price shall be decreased by an amount equal to the sum of the following
amounts (determined without duplication):

               (i) the amount of all proceeds (net to Noble’s interest) earned and received or to be received
by or on behalf of Noble (other than proceeds from the exercise by third parties of preferential
rights to purchase all or any portion of the Leasehold Interests) that are attributable to the
ownership or operation of the Assets from and after the Effective Time;

               (ii) an amount equal to the aggregate sum of the Allocated Value of each Asset designated with
a positive value that is either purchased by a holder of a preferential purchase right covering
such Asset as contemplated in Section 3.9 or held back from the Closing pursuant to Section 3.9 or
3.10;

               (iii) an amount equal to the aggregate of the Title Defect Amounts, Environmental Defect
Values and Damages for which Purchaser is entitled to receive as a Purchase Price reduction
pursuant to Section 3.4;

               (iv) an amount equal to the aggregate sum of the Allocated Value of each Asset designated with
a positive value that is excluded from this Agreement pursuant to Section 3.2(c) or Section 3.11;

               (v) an amount equal to the Adjustment Amount referenced in Section 3.5;

               (vi) an amount equal to the Defects Escrow Amount as provided in Section 3.6; and

               (vii) an amount equal to the sum of four and 50/100 dollars ($4.50) per mcf, less royalties,
overrides and taxes, that the Assets reflect an Imbalance of gas equal to the sum of (A) net
underproduction of the Assets between or equal to .1 or 0 bcf of gas, and (B) any net
overproduction of gas.

     2.3 Payment and Calculation of Estimated Adjusted Purchase Price and Payment at
Closing.

          (a) Noble shall prepare and deliver to Purchaser, at least five (5) “Business Days” (which
term shall mean any day except a Saturday, Sunday or other day on which commercial banks in New
York, New York, or Houston, Texas are required or authorized by law to be closed) prior to the
Closing Date, Noble’s good faith estimate of the Adjusted Purchase Price to be paid at Closing to
Noble (such estimated Adjusted Purchase Price being herein referred to as the “Estimated Adjusted
Purchase Price”), together with a statement setting forth Noble’s good faith estimate of the amount
of each adjustment to the Purchase Price to be made pursuant to Section 2.2. The Parties shall
negotiate in good faith and attempt to agree on such estimated adjustments prior to Closing. In
the event any estimated adjustment amounts are not

5

 

agreed upon prior to Closing, then such disagreement shall be resolved as provided in Section
17.1.

          (b) At Closing, Purchaser shall pay to Noble (or to the qualified escrow/trust account if
Noble has exercised its right to consummate this transaction as a like-kind exchange pursuant to
Section 2.4) the Estimated Adjusted Purchase Price determined as set forth in Section 2.3(a), less
an amount equal to the Deposit only if (i) Noble has not elected to effect a like-kind exchange
pursuant to Section 2.4 or (ii) Noble has elected to effect a like-kind exchange pursuant to
Section 2.4 and the Parties have directed the Escrow Agent to transfer the Deposit to the qualified
escrow/trust account.

     2.4 Like-Kind Exchange Option.

          (a) Noble and Purchaser hereby agree that Noble, in lieu of the sale of the Assets to
Purchaser for the cash consideration provided herein, shall have the right at any time prior to
Closing to assign all or a portion of its rights under this Agreement to a qualified intermediary
in order to accomplish the transaction in a manner that will comply, either in whole or in part,
with the requirements of a like-kind exchange pursuant to §1031 of the Code. In the event Noble
assigns its rights under this Agreement pursuant to this Section 2.4, Noble agrees to notify
Purchaser in writing of such assignment at or before Closing. If Noble assigns its rights under
this Agreement pursuant to this Section 2.4, Purchaser agrees to (i) acknowledge Noble’s assignment
of its rights in this Agreement in the form attached hereto as Schedule 2.4(a), and (ii)
deposit the Estimated Adjusted Purchase Price with the qualified escrow or qualified trust account
at Closing.

          (b) Noble hereby acknowledges that assignment of its rights pursuant to this Section 2.4 does
not relieve Noble from any of its obligations under this Agreement.

     2.5 Post-Closing Adjustment. Within five (5) Business Days after the final
determination of the Adjusted Purchase Price in accordance with Section 11.1, Purchaser shall pay
to Noble or Noble shall pay to Purchaser, as the case may be, the amount by which such final
Adjusted Purchase Price is greater than or less than, respectively, the Estimated Adjusted Purchase
Price.

ARTICLE 3

TITLE AND ENVIRONMENTAL MATTERS

     3.1 Title Due Diligence.

          (a) From the date of this Agreement until 5:00 p.m. Central Time on June 30, 2006 (the
“Examination Period”), Noble shall afford Purchaser and its authorized representatives reasonable
access during normal business hours to the office, personnel and books and records of Noble in
order for Purchaser to conduct a title examination as it may choose to conduct with respect to the
Assets in order to determine whether Title Defects exist (“Purchaser’s Title Review”); provided,
however, that such investigation shall be upon reasonable notice and shall not unreasonably disrupt
the personnel and operations of Noble or

6

 

impede the efforts of Noble to comply with its other obligations under this Agreement. Such
books and records shall include all abstracts of title, title opinions, title files, ownership
maps, lease files, assignments, division orders, operating records and agreements, well files,
financial and accounting records, geological, geophysical and engineering records, in each case
insofar as same may now be in existence and in the possession of Noble, excluding, however, any
information that Noble is prohibited from disclosing by bona fide, Third Party confidentiality
restrictions (provided that Noble shall use its reasonable efforts to cause such restrictions to be
removed with respect to Purchaser). The cost and expense of Purchaser’s Title Review, if any, shall
be borne solely by Purchaser. Prior to the Closing Date, Purchaser shall not contact any of the
customers or suppliers of Noble or its working interest co-owners or operators in connection with
the transactions contemplated hereby, whether in person or by telephone, mail or other means of
communication, without the prior written consent of Noble.

          (b) If Purchaser discovers any Title Defect affecting any of the Assets, Purchaser may notify
Noble prior to the expiration of the Examination Period of such alleged Title Defect. To be
effective, such notice (“Title Defect Notice”) must (i) be in writing, (ii) be received by Noble
prior to the expiration of the Examination Period, (iii) describe the Title Defect in detail
(including any alleged variance in the Net Revenue Interest), (iv) identify the specific Asset(s)
affected by such Title Defect, and (v) include the value of such Title Defect as determined by
Purchaser in good faith. Subject to Sections 3.7, 3.9, 3.10, 4.11, 4.12, 4.16 and 4.17, any
matters that may otherwise constitute Title Defects, but of which Noble has not been specifically
notified by Purchaser in accordance with the foregoing, shall be deemed to have been waived by
Purchaser for all purposes. Upon the receipt of such effective Title Defect Notice from Purchaser,
Noble shall have the option, in addition to the remedies set forth in Section 3.1(c), but not the
obligation, to attempt to cure such Title Defect at any time prior to the Closing. The Asset
affected by such uncured Title Defect shall be a “Title Defect Asset”.

          (c) With respect to each Title Defect that is not cured on or before the Closing, the Purchase
Price shall be reduced, subject to Section 3.4, by the Title Defect Amount with respect to such
Title Defect Asset. The “Title Defect Amount” shall mean, with respect to a Title Defect Asset,
the amount by which such Title Defect Asset is impaired as a result of the existence of one or more
Title Defects, which amount shall be determined as follows:

               (i) The Title Defect Amount with respect to a Title Defect Asset shall be determined by taking
into consideration the “Allocated Value” (as set forth in Schedule 3.1(c) attached hereto)
of the Asset (or the Wells associated therewith) subject to such Title Defect, the portion of the
Asset subject to such Title Defect, and the legal effect of such Title Defect on the Asset (or the
Wells or other property associated therewith) affected thereby; provided, however, that: (A) if
such Title Defect is in the nature of Noble’s Net Revenue Interest in an Asset being less than the
Net Revenue Interest set forth in Exhibit “A”
or Exhibit “A-1” hereto, as the case
may be, and the Working Interest remains the same, then the Title Defect Amount shall be equal to
the Allocated Value for the relevant Asset (or the Wells associated therewith) multiplied by the
percentage reduction in such Net Revenue Interest as a result of such Title Defect or (B) if such
Title Defect is in the nature of a Lien, then the Title Defect Amount shall equal the amount
required to fully discharge such Lien; and

7

 

               (ii) If the Title Defect results from any matter not described in clause (A) or (B) of Section
3.1(c)(i), the Title Defect Amount shall be an amount equal to the difference between the value of
the Title Defect Asset affected by such Title Defect with such Title Defect and the value of such
Title Defect Asset without such Title Defect (taking into account the Allocated Value of the Title
Defect Asset); and

               (iii) If the Title Defect Asset has not been separately allocated an Allocated Value, but is
part of an Asset or group of Assets which has or have an Allocated Value, then the Allocated Value
of such Title Defect Asset shall be a fair and reasonable portion of the Allocated Value of such
Asset or group of Assets which has or have an Allocated Value; and

               (iv) In no event shall the Title Defect Amount related to a particular Asset exceed the
Allocated Value, if any, of such Asset; and

               (v) The Title Defect Amount with respect to a Title Defect Asset shall be determined without
duplication of any costs or losses included in another Title Defect Amount hereunder. For example,
but without limitation, if a lien affects more than one Title Defect Asset or the curative work
with respect to one Title Defect results in the curing of any other Title Defect affecting the same
or another Title Defect Asset, the amount necessary to discharge such lien or the cost and expense
of such curative work shall be allocated among the Title Defect Assets so affected (in the ratios
of the respective portions of the Purchase Price allocated to such Title Defect Assets) and the
amount so allocated to a Title Defect Asset shall be included only once in the Title Defect Amount
therefor.

          (d) As used in this Section 3.1:

               (i) “Defensible Title” means, as of the date of this Agreement and the Closing Date with
respect to the Assets, such record title and ownership by Noble that: (A) entitles Noble to receive
and retain, without reduction, suspension or termination, not less than the percentage set forth in
Exhibit “A” or Exhibit “A-1”, as the case may be, as Noble’s Net Revenue Interest
of all Hydrocarbons produced, saved and marketed from each Leasehold Interest and/or Well
comprising such Asset as set forth in Exhibit
“A” or Exhibit “A-1”, as the case may
be, through plugging, abandonment and salvage of all Wells comprising or included in such Asset,
and except for changes or adjustments that result from the establishment of units, changes in
existing units (or the participating areas therein), or the entry into of pooling or unitization
agreements after the date hereof unless made in breach of the provisions of Section 6.1; (B)
obligates Noble to bear not greater than the percentage set forth in Exhibit “A”,
Exhibit “A-1” or Exhibit “A-4”, as the case may be, as Noble’s Working Interest of
the costs and expenses relating to the maintenance, development and operation of each Leasehold
Interest, Well and/or Platform comprising such Asset, through plugging, abandonment and salvage of
all Wells and/or Platforms comprising or included in such Asset, and except for changes or
adjustments that result from the establishment of units, changes in existing units (or the
participating areas therein), or the entry into of pooling or unitization agreements after the date
hereof unless made in breach of the provisions of Section 6.1; (C) is free and clear of all Liens,
except Permitted Encumbrances; (D) reflects that all consents to assignment, notices of

8

 

assignment or preferential purchase rights which are applicable to or must be complied with in
connection with the transaction contemplated by this Agreement or any prior sale, assignment or the
transfer of such Asset, have been obtained and complied with or waived to the extent the failure to
obtain or comply with the same could render this transaction or any such sale, assignment or
transfer (or any right or interest affected thereby) void or voidable or could result in Purchaser
or Noble incurring any liability; and (E) with respect to those Assets for which there is no Net
Revenue Interest and/or Working Interest expressed on Exhibit
“A”, Exhibit “A-1”
or Exhibit “A-4”, as the case may be, is defensible.

               (ii) “Permitted Encumbrances” shall mean (A) Liens for taxes which are not yet delinquent; (B)
normal and customary Liens of co-owners under operating agreements, unitization agreements, and
pooling orders relating to the Assets, which obligations are not yet due and pursuant to which
Noble is not in default; (C) mechanic’s and materialman’s Liens relating to the Assets, which
obligations are not yet due and pursuant to which Noble is not in default; (D) Liens in the
ordinary course of business consisting of minor defects and irregularities in title or other
restrictions (whether created by or arising out of joint operating agreements, farm-out agreements,
leases and assignments, contracts for purchases of Hydrocarbons or similar agreements, or otherwise
in the ordinary course of business) that are of the nature customarily accepted by prudent
purchasers of oil and gas properties and do not decrease the Net Revenue Interest or increase the
Working Interest set forth in Exhibit “A”,
Exhibit “A-1” or Exhibit “A-4”,
as the case may be (without a proportionate increase in the corresponding Net Revenue Interest), or
materially affect the value of any property encumbered thereby; (E) all approvals required to be
obtained from Governmental Entities that are lessors under Leasehold Interests forming a part of
the Assets (or who administer such Leasehold Interests on behalf of such lessors) which are
customarily obtained post-closing; (F) preferential rights to purchase and consent to transfer
requirements of any Person (to the extent same have been complied with in connection with the prior
sale, assignment or the transfer of such Asset); and (G) conventional rights of reassignment
normally actuated by an intent to abandon or release a lease and requiring notice to the holders of
such rights.

               (iii) “Title Defect” shall mean any particular defect in or failure of Noble’s ownership of
any Asset: (A) that causes Noble to not have Defensible Title to such Asset, (B) that has
attributable thereto a Title Defect Amount in excess of $100,000 and (C) regarding which a Title
Defect Notice has been timely and otherwise validly delivered. Notwithstanding any other provision
in this Agreement to the contrary, defects or irregularities that have been cured or remedied by
the applicable statutes of limitation or statutes for prescription shall not constitute and shall
not be asserted a Title Defect.

          (e) If prior to Closing Noble and Purchaser are unable to reach an agreement as to whether a
Title Defect exists or, if it does exist, the Title Defect Amount attributable to such Title
Defect, then the provisions of Section 3.5 shall apply.

          (f) If Noble determines (or should Purchaser, in the course of Purchaser’s Title Review,
determine) that Noble’s Net Revenue Interest in an Asset is greater than the Net Revenue Interest
set forth in Exhibit “A” or Exhibit
“A-1” hereto, as the case may be, by more than
$100,000 and the Working Interest remains the same, then the Parties agree that the

9

 

Purchase Price shall be increased in an amount equal to the Allocated Value for the relevant
Asset multiplied by the percentage increase in such Net Revenue Interest.

     3.2 Environmental Due Diligence.

          (a) Purchaser shall have the right, or the right to cause an environmental consultant
acceptable to Purchaser in its sole discretion (“Purchaser’s Environmental Consultant”), to conduct
an environmental review of the Assets prior to the expiration of the Examination Period
(“Purchaser’s Environmental Review”). No less than three (3) Business Days prior to the proposed
commencement date of Purchaser’s Environmental Review, Purchaser shall notify Noble of the
commencement of Purchaser’s Environmental Review and shall coordinate the locations of such
activities with Noble. The cost and expense of Purchaser’s Environmental Review shall be borne
solely by Purchaser. No Person, other than Purchaser’s Environmental Consultant and Purchaser’s
employees or representatives, may conduct Purchaser’s Environmental Review. Noble shall have the
right to have representatives thereof present to observe Purchaser’s Environmental Review conducted
in Noble’s offices or on the Assets. With respect to any samples taken in connection with
Purchaser’s Environmental Review, Noble shall be permitted to take split samples. Purchaser agrees
to conduct Purchaser’s Environmental Review in a manner so as not to unduly interfere with the
business operations of Noble and in compliance with all Applicable Laws, and Purchaser shall
exercise due care with respect to Noble’s properties and their condition.

          (b) Prior to the Closing, unless otherwise required by Applicable Law, Purchaser shall (and
shall cause Purchaser’s Environmental Consultant, if applicable, to) treat confidentially any
matters revealed by Purchaser’s Environmental Review and any reports or data generated from such
review (the “Environmental Information”), and Purchaser shall not (and shall cause Purchaser’s
Environmental Consultant, if applicable, to not) disclose any Environmental Information to any
Governmental Entity or other third party (other than to any of Purchaser’s shareholders, employees,
lenders or representatives that agree to treat such information confidentially in accordance
herewith) without the prior written consent of Noble, except to the extent required by Applicable
Law. Prior to the Closing, unless otherwise required by Applicable Law, Purchaser may use the
Environmental Information only in connection with the transactions contemplated by this Agreement.
If Purchaser, Purchaser’s Environmental Consultant, if applicable, or any third party to whom
Purchaser has provided any Environmental Information in accordance with this Section 3.2(b) becomes
legally compelled to disclose any of the Environmental Information, Purchaser shall provide Noble
with prompt written notice and Noble may file a protective order, or seek any other remedy, as it
deems appropriate under the circumstances. If this Agreement is terminated prior to the Closing,
Purchaser shall deliver the Environmental Information to Noble, which Environmental Information
shall become the sole property of Noble. At any time upon Noble’s written request to Purchaser,
Purchaser shall provide copies of any report of Purchaser’s Environmental Consultant to Noble
without charge.

          (c) If Purchaser or Purchaser’s Environmental Consultant, if applicable, discovers any
Environmental Defect prior to the expiration of the Examination Period, Purchaser shall notify
Noble prior to the expiration of the Examination Period of such alleged Environmental Defect. To
be effective, such notice (an “Environmental Defect Notice”) must

10

 

(i) be in writing; (ii) be received by Noble prior to the expiration of the Examination
Period; (iii) describe the Environmental Defect in reasonable detail, including (A) the specific
Asset affected by or associated with such Environmental Defect, (B) if applicable, a site plan
showing the location of all sampling events, boring logs and other field notes describing the
sampling methods utilized and the field conditions observed, (C) the written conclusion of
Purchaser’s Environmental Consultant, if applicable, that an Environmental Defect is believed to
exist, which conclusion shall be reasonably substantiated by the factual data gathered during
Purchaser’s Environmental Review, and (D) if feasible and applicable, a separate, reasonably
specific citation of the provisions of the Environmental Laws alleged to be violated and the
related facts that substantiate such violation; (iv) describe the procedures recommended to
correct, eliminate or pay the Environmental Defect, together with any related recommendations from
Purchaser’s Environmental Consultant, if applicable; and (v) set forth Purchaser’s good faith
estimate of the Environmental Defect Value, including the basis for such estimate. Subject to
Noble’s representations and indemnity obligations herein, any matters that may otherwise constitute
Environmental Defects, but of which Noble has not been specifically notified by Purchaser in
accordance with the foregoing, together with any environmental matter that does not constitute an
Environmental Defect, shall be deemed to have been waived by Purchaser for purposes of this Section
3.2. Upon the receipt of effective notice from Purchaser, Noble shall have the option, in addition
to the remedy set forth in Section 3.2(d), but not the obligation, to (x) attempt to cure such
Environmental Defect at any time prior to the Closing, at the sole cost and expense of Noble or (y)
exclude the Assets affected by such Environmental Defect from this Agreement and the Purchase Price
to be paid at Closing shall be reduced by the Allocated Value for such Assets if such Allocated
Value is positive and increased by such Allocated Value for such Assets if such Allocated Value is
negative. If prior to Closing Noble and Purchaser are unable to reach an agreement as to whether
an Environmental Defect exists or, if it does exist, the amount of the Environmental Defect Value
attributable thereto, then the provisions of Section 3.5 shall be applicable.

          (d) If any Environmental Defect described in a notice delivered in accordance with Section 3.2
is not cured on or before the Closing, then the Purchase Price shall be reduced, subject to Section
3.4, by the Environmental Defect Value of such Environmental Defect.

          (e) As used in this Section 3.2:

               (i) “Environmental Defect” shall mean, with respect to any given Asset, a violation of
Environmental Laws in effect as of the date hereof in the jurisdiction in which such Asset is
located, an obligation under Environmental Laws to undertake within a reasonable period of time any
corrective action on an Asset, or any Environmental Liability arising from or attributable to any
condition, event, circumstance, activity, practice, incident, action, or omission existing or
occurring prior to the Closing Date, or the use, release, storage, treatment, transportation, or
disposal of hazardous substances prior to the Closing Date (A) regarding which an Environmental
Defect has been timely and otherwise validly delivered, and (B) that has an Environmental Defect
Value attributable thereto in excess of $100,000.

               (ii) “Environmental Defect Value” shall mean, (A) the reasonably estimated costs and expenses
to correct such Environmental Defect in the most cost effective

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manner reasonably available, consistent with Environmental Laws, and (B) the amount of the
Environmental Liabilities reasonably believed will be incurred or required to be paid by Noble
and/or the Purchaser with respect thereto. The Parties recognize that the calculation of an
Environmental Defect Value may require the use of assumptions and extrapolations; however, it is
acknowledged and agreed that any such assumptions and extrapolations will be consistent with the
known factual information and reasonable in nature.

     3.3 Notice of Breaches of Representations and Warranties Pre-Closing. If, in the
course of conducting its due diligence examination of Noble prior to Closing (other than in
connection with Purchaser’s Title Review and Purchaser’s Environmental Review), Purchaser becomes
aware of a breach of a representation and warranty made by Noble in this Agreement, Purchaser
shall give Noble prompt notice of such breach, which notice shall (a) describe in detail the nature
of the asserted breach and (b) specify the proposed Damages resulting from such asserted breach.
The Parties shall endeavor in good faith to agree upon whether any breach of a representation and
warranty made by Noble, in this Agreement asserted by Purchaser is an actual breach and, if it is
determined that there is an actual breach, the amount of the Damages attributable thereto. If,
however, the Parties are unable to reach an agreement, either on whether there is an actual breach
or the amount of the Damages attributable thereto (as appropriate), the provisions of Section 17.1
shall be applicable.

     3.4 Adjustments to Purchase Price for Title Defects, Environmental Defects and Breaches of
Representations and Warranties. Notwithstanding anything to the contrary contained in this
Agreement: (i) if the aggregate of the Title Defect Amounts, Environmental Defect Values and
Damages arising from a breach of a representation and warranty made by Noble (excluding the
representation and warranty contained in Section 4.7(d)), each as determined in accordance with
this Agreement, is less than or equal to ten million dollars ($10,000,000) (the “Deductible
Amount”), then no adjustment of the Purchase Price shall be made therefor, and (ii) if the
aggregate of the Title Defect Amounts, Environmental Defect Values and Damages arising from a
breach of a representation and warranty made by Noble (excluding the representation and warranty
contained in Section 4.7(d)), each as determined in accordance with this Agreement, is greater than
the Deductible Amount, then the Purchase Price shall be adjusted downward by (a) the amount that
the aggregate of such Title Defect Amounts, Environmental Defect Values and Damages exceeds the
Deductible Amount and (b) the amount of Damages attributable to an actual breach of the
representation and warranty contained in Section 4.7(d).

     3.5 Deferred Claims and Disputes. Subject to the terms of Section 3.9 and Section
3.10, in the event that the Parties are unable to reach an agreement prior to Closing as to whether
(a) a Title Defect exists or, if it does exist, the Title Defect Amount attributable to such Title
Defect or (b) an Environmental Defect exists or, if it does exist, the amount of the Environmental
Defect Value attributable thereto, any such dispute or claim (a “Deferred Adjustment Claim”) shall
be settled pursuant to this Section 3.5 and shall not prevent or delay Closing. In no event shall
any Title Defect Amount or Environmental Defect Value asserted by Purchaser as a Deferred
Adjustment Claim exceed the amount asserted by Purchaser therefor prior to the end of the
Examination Period. With respect to each potential Deferred Adjustment Claim, Purchaser shall
deliver to Noble prior to Closing a written notice describing each such potential Deferred

12

 

Adjustment Claim, Purchaser’s good faith estimate of the value attributable to such Deferred
Adjustment Claim (the “Purchaser‘s Estimate”) and a statement setting forth the facts and
circumstances that support Purchaser’s position with respect to such Deferred Adjustment Claim and
Purchaser’s Estimate. An amount equal to Purchaser’s Estimate of any Deferred Adjustment Claims
(the “Adjustment Amount”) shall be deducted from the Purchase Price otherwise payable at Closing
and paid into the Defects Escrow with the Defects Escrow Agent pursuant to the terms of the Defects
Escrow Agreement. Any Adjustment Amount deposited into the Defects Escrow pursuant to this Section
3.5 will remain therein until released as provided in this Section 3.5. On or prior to the
thirtieth (30th) consecutive calendar day following the Closing Date (the “Deferred Matters Date”),
the Parties shall attempt in good faith to reach agreement on the Deferred Adjustment Claims and,
ultimately, to resolve by written agreement all disputes regarding the Deferred Adjustment Claims.
Any Deferred Adjustment Claims which are not so resolved on or before the Deferred Matters Date may
be submitted by either Party to final and binding arbitration in accordance with Section 17.1.
Notwithstanding anything herein provided to the contrary, including Section 3.6, Noble shall be
entitled to cure any Title Defect which gives rise to a Deferred Adjustment Claim at any time prior
to the point in time when a final and binding written decision of the Independent Expert is made
pursuant to Section 17.1. If the value of any Deferred Adjustment Claim determined under the final
and binding written decision of the Independent Expert pursuant to Section 17.1 or the written
agreement of Purchaser and Noble (the “Resolved Amount”) is less than or equal to the Adjustment
Amount regarding such Deferred Adjustment Claim, then the Resolved Amount withheld in the Defects
Escrow (together with interest thereon) shall be promptly released therefrom to Purchaser in
accordance with the terms of the Defects Escrow Agreement and, to the extent applicable, the
remaining amount withheld in the Defects Escrow with respect to such Deferred Adjustment Claim (the
“Overheld Amount”) (together with interest thereon) shall be promptly released to Noble in
accordance with the terms of the Defects Escrow Agreement. Notwithstanding anything herein
contained to the contrary, (x) in no event shall the Resolved Amount (less any interest earned
thereon) be greater than Purchaser’s Estimate and (y) Purchaser shall pay to Noble an amount equal
to the Agreed Rate on the Overheld Amount from the Closing Date until the date of payment.

     3.6 Option to Cure Title Defects Post-Closing.

          (a) Notwithstanding anything herein to the contrary, if Noble is not able to cure a Title
Defect on or prior to Closing, Noble shall have the option, by notice in writing to Purchaser on or
before Closing, to attempt to cure such Title Defect (other than a Title Defect where a difference
in the Net Revenue Interest and/or Working Interest causes Noble to not have Defensible Title)
after the Closing (with any such Title Defect being called a “Post-Closing Defect”). In such
event, the transactions contemplated hereby will close as provided herein, but an amount equal to
the Title Defect Amount for the Title Defect to which the Post-Closing Defect pertains (the
“Defects Escrow Amount”) shall be deducted from the Purchase Price otherwise payable at Closing and
paid into an escrow account (the “Defects Escrow”) established with a federally insured savings or
banking institution mutually acceptable to Purchaser and Noble (the “Defects Escrow Agent”)
pursuant to the terms of an escrow agreement in a form acceptable to the Defects Escrow Agent and
reasonably acceptable to Purchaser and Noble (the

13

 

“Defects Escrow Agreement”). The amount deposited into the Defects Escrow with respect to a
Post-Closing Defect will remain therein until released as provided in Section 3.6(b).

          (b) Purchaser will act in good faith and reasonably cooperate with Noble after the Closing to
cure a Post-Closing Defect. If Noble and Purchaser mutually agree that a Post-Closing Defect has
been cured, then within two (2) Business Days after such determination, the amount withheld in the
Defects Escrow with respect thereto (together with any interest earned thereon) shall be released
to Noble in accordance with the terms of the Defects Escrow Agreement. If Noble and Purchaser
mutually agree that a Post-Closing Defect has been partially cured, then Noble and Purchaser shall
mutually determine the portion of the amount retained in the Defects Escrow with respect thereto
(together with any interest earned thereon) that should be paid to Purchaser to compensate it for
the uncured portion thereof (together with interest earned thereon) and the remaining portion of
such amount shall be released to Noble (together with any interest earned thereon) in accordance
with the terms of the Defects Escrow Agreement.

          (c) If Noble and Purchaser mutually agree that a Post-Closing Defect has not been cured, then
within two (2) Business Days after such determination, the amount withheld in the Defects Escrow
with respect thereto (together with any interest earned thereon) shall be released to Purchaser in
accordance with the terms of the Defects Escrow Agreement. If, at the end of the 180-day period
commencing on the Closing Date (the “Cure Period”), Noble has been unable to cure a Post-Closing
Defect (and there is no dispute as to whether or not it has been cured), the amount withheld in the
Defects Escrow with respect thereto (together with any interest earned thereon) shall be released
to Purchaser in accordance with the terms of the Defects Escrow Agreement. If, at the end of the
Cure Period, Noble and Purchaser are unable to agree whether there has been a satisfactory
resolution of a Post-Closing Defect, then such disagreement shall be resolved as provided in
Section 17.1.

     3.7 Limited Warranty of Title. The transfer of the Assets to Purchaser shall be
without warranty of title of any kind whatsoever, express, implied or statutory, except that Noble
does hereby bind and obligate itself and its successors and assigns to warrant and defend, subject
to the terms hereof, to the Permitted Encumbrances and to any Title Defects asserted pursuant to
Section 3.1, title to the Leasehold Interests set forth on Exhibit “A” hereto, including
the Working Interests and Net Revenue Interests as reflected on
Exhibit “A-1” for the
particular Wells identified thereon (excluding, however, title to or any representation with
respect to the contractual working interests and unit interests as reflected in Exhibit “A”
and Exhibit “A-1”), unto Purchaser, its successors and assigns, against all persons
lawfully claiming or to claim the same or any part thereof by, through or under Noble or its
Affiliates, but not otherwise; provided, however, that Noble may offset any breach by Noble of the
forgoing warranty by $100,000 and by any unused portion of the Deductible Amount.

     3.8 Notices to Holders of Preferential Purchase Rights. With respect to each party
holding a preferential purchase right covering Leasehold Interests (a list of the affected
Leasehold Interests is set forth in Schedule 4.12), upon execution of this Agreement, Noble
shall promptly send to the holder of such preferential right a notice offering to sell to such
holder, in accordance with the contractual provisions applicable to such right, those Leasehold
Interests and related Assets covered by such right on the terms hereof and based on the Allocated
Value of

14

 

such affected Leasehold Interests, subject to adjustments in price in the same manner that the
Purchase Price is adjusted pursuant to Article 2 and Article 11 of this Agreement.

     3.9 Exercise of Preferential Purchase Rights.

          (a) Noble shall use the Allocated Value (as set forth in Schedule 3.1(c)) to provide
any required preferential right to purchase notifications to third parties based on the form of
Preferential Purchase Right Election Letter attached hereto as Schedule 3.9 (the “Pref
Right Notice”). If, within the time prescribed in the governing agreements, a holder of a
preferential purchase right notifies Noble that it elects to exercise its rights with respect to an
Asset to which its preferential purchase right applies (determined by and in accordance with the
agreement in which the preferential purchase right arises), the Asset covered by that preferential
purchase right will not be sold to the Party originally executing this Agreement as “Purchaser”
(subject to the remaining provisions in this Article), and the Purchase Price will be reduced by
the Allocated Value for such Asset if the Allocated Value is positive and increased by the
Allocated Value for such Asset if the Allocated Value is negative. However, in the event the
transactions contemplated by this Agreement should fail to close, the holder of such preferential
purchase right shall not be entitled to purchase thereunder.

          (b) If on the Closing Date any preferential purchase right applicable to an Asset and the
transactions contemplated hereby has not been waived and the time to elect has not elapsed, such
Asset(s) affected thereby shall be held back from the Assets to be conveyed to Purchaser at Closing
(and the Purchase Price to be paid at Closing shall be reduced by the Allocated Value for such
Asset(s) if such Allocated Value is positive and increased by the Allocated Value for such Asset(s)
if such Allocated Value is negative) and Closing with respect to the unaffected Assets shall
proceed, and the Parties shall conduct a second closing with respect to the Asset(s) affected by
such preferential purchase right within ten (10) days (or the next Business Day thereafter if such
day is not a Business Day) after any such preferential purchase right has been waived or the time
to elect has elapsed. If such preferential purchase right has not been waived and the time to
elect has not elapsed or has been exercised but not yet closed, within ninety (90) days after the
Closing Date, the Asset(s) affected thereby, automatically and without need to amend this
Agreement, shall be removed and excluded from this Agreement and Purchaser shall have no further
rights or obligations with respect to the same.

     3.10 Consents to Assignment. With respect to each party holding a consent to assign,
upon execution of this Agreement, Noble shall promptly notify said parties of this Agreement and
seek to obtain their consents to the assignments contemplated hereby. If Noble fails to obtain a
material consent set forth on Schedule 4.11, then, unless otherwise mutually agreed by
Noble and Purchaser, any Asset or portion thereof subject thereto shall be held back from the
Assets to be conveyed to Purchaser at Closing, and the Purchase Price to be paid at Closing shall
be reduced by the Allocated Value for such Asset (or portion thereof) if such Allocated Value is
positive and increased by the Allocated Value for such Asset (or portion thereof) if such Allocated
Value is negative. In the event that such consent (with respect to an Asset or portion thereof
excluded pursuant to this Section 3.10 is obtained within sixty (60) days following the Closing
then within five (5) days thereafter, Purchaser shall purchase such Asset or portion thereof and
pay to Noble the amount by which the Purchase Price was reduced with respect

15

 

thereto and Noble shall assign to Purchaser such Asset or portion thereof pursuant to the
applicable Assignment and Bill of Sale set forth in Section 10.2(a).

     3.11 Casualty Loss. Subject to Sections 8.10 and 9.8, if after the date hereof and
prior to the Closing any portion of the Assets shall be damaged or destroyed by a Casualty or taken
in condemnation or the exercise of eminent domain, Noble shall promptly notify Purchaser of the
Assets so affected and, in the event of a Casualty, Noble’s good faith estimate of the time and
expense required to repair such damage or destruction. Noble shall also elect by written notice to
Purchaser at least five (5) Business Days prior to Closing either (a) in the event of a Casualty,
to cause the Assets affected by such Casualty to be repaired or restored, at Noble’s sole cost and
expense, as promptly as reasonably practicable (which work may extend after the Closing), (b) in
the event of a Casualty, to indemnify Purchaser through a document reasonably acceptable to
Purchaser against any costs and expenses that Purchaser reasonably incurs to repair the Assets
subject to such Casualty or taking, (c) treat such Casualty or taking as a Title Defect with
respect to the affected Assets or (d) exclude any Asset subject to such Casualty or taking from
this Agreement and the Purchase Price to be paid at Closing shall be reduced by the Allocated Value
for such Asset (or portion thereof) if such Allocated Value is positive and increased by the
Allocated Value for such Asset (or portion thereof) if such Allocated Value is negative.

ARTICLE 4

REPRESENTATIONS AND WARRANTIES OF NOBLE

     Noble represents and warrants to Purchaser that:

     4.1 Existence. Noble is a corporation duly organized, validly existing and in good
standing under the laws of the State of Delaware and is duly qualified to carry on its business in
the states or jurisdictions where the Assets are located.

     4.2 Power. Noble has the corporate power and authority to enter into and perform this
Agreement and the transactions contemplated hereby. No suit, action or other proceeding by a third
party or a Governmental Entity is pending or threatened which seeks substantial damages from Noble
in connection with, or seeks to restrain, enjoin or otherwise prohibit, the consummation of the
transactions contemplated by this Agreement. Subject to applicable requirements under the HSR Act
and to preferential purchase rights and restrictions on assignment of the type generally found in
the oil and gas industry, and to rights to consent by, required notices to, and filings with or
other actions by Governmental Entities where the same are customarily obtained subsequent to the
assignment of oil and gas interests and leases, the execution, delivery and performance of this
Agreement by Noble, and the transactions contemplated hereby, will not violate (a) any provision of
the certificate of incorporation or bylaws of Noble, (b) any material agreement or instrument to
which Noble is a party or by which Noble or any of the Leasehold Interests are bound, (c) any
judgment, order, ruling, or decree applicable to Noble as a party in interest, or (d) any law, rule
or regulation applicable to Noble.

     4.3 Authorization. The execution, delivery and performance of this Agreement and the
transactions contemplated hereby have been duly and validly authorized by all requisite corporate
action on the part of Noble. This Agreement has been duly executed and delivered on

16

 

behalf of Noble, and at the Closing all documents and instruments required hereunder to be
executed and delivered by Noble shall have been duly executed and delivered. This Agreement does,
and such documents and instruments shall, constitute legal, valid and binding obligations of Noble
enforceable in accordance with their terms, subject, however, to the effect of bankruptcy,
insolvency, reorganization, moratorium and similar laws from time to time in effect relating to the
rights and remedies of creditors, as well as to general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law).

     4.4 Brokers. Noble has incurred no obligation or liability, contingent or otherwise,
for brokers’ or finders’ fees in respect of the matters provided for in this Agreement that will be
the responsibility of Purchaser; and any such obligation or liability that might exist shall be the
sole obligation of Noble.

     4.5 Foreign Person. Noble is not a “foreign person” within the meaning of the
Internal Revenue Code of 1986, as amended (the “Code”), Section 1445 and 7701 (i.e., Noble is not a
nonresident alien, foreign corporation, foreign partnership, foreign trust or foreign estate as
those terms are defined in the Code and any regulations promulgated thereunder).

     4.6 Litigation. Schedule 4.6 sets forth all claims, suits, actions and
litigation by any Person pending by or before any Governmental Entity or to Noble’s Knowledge,
threatened, in each case, against Noble in connection with the Assets or otherwise relating to the
Assets and which are to be assumed by Purchaser.

     4.7 Material Contracts.

          (a)
Exhibit “A-2” sets forth all contracts of the type described below that are
included in the Assets (collectively, the “Material Contracts”):

               (i) any contract that can reasonably be expected to result in aggregate payments of more than
$100,000 (based solely on the terms thereof and without regard to any expected increase in volumes
or revenues) that is not terminable without penalty on sixty (60) days or fewer notice during the
current or any subsequent calendar year;

               (ii) any contract that can reasonably be expected to result in aggregate revenues to Noble of
more than $500,000 (based solely on the terms thereof and without regard to any expected increase
in volumes or revenues) during the current or any subsequent calendar year;

               (iii) any Hydrocarbon purchase and sale, transportation, processing or similar contract
relating to or included in the Assets that is not terminable without penalty on sixty (60) days or
less notice;

               (iv) any contract that is an indenture, mortgage, loan, credit or sale-leaseback or similar
financial contract;

               (v) any contract that constitutes a lease under which Noble is the lessor or the lessee of
real or personal property which lease (A) cannot be terminated by Noble

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without penalty upon sixty (60) days or less notice and (B) involves an annual base rental of
more than $100,000; and

               (vi) any Affiliate contract which will not be terminated prior to Closing and/or that is in
effect from and after the Effective Date.

          (b) Except as set forth on Schedule 4.7 and except for such matters that would not
have a Material Adverse Effect, there exist no defaults under any material contract listed on
Exhibit “A-2” by Noble or, to Noble’s Knowledge, by any other Person that is a party to
such contracts. As soon as possible but in any event no later than June 1, 2006, Noble agrees to
deliver or make available to Purchaser for its review copies of each contract to which the Assets
are subject, including all contracts listed on Exhibit
“A-2” and all amendments thereto.

          (c) No Asset shall be transferred to Purchaser at Closing subject to an existing hedge,
forward sale, swap or similar contract, nor will the Purchase Price adjustments hereunder take into
account the effects of any such contract.

          (d) Except for contracts and agreements that are excluded from this Agreement in connection
with Assets held back pursuant to Sections 3.9 and Section 3.10, there are no contracts or
agreements included in or affecting the Assets (including any contract or agreement listed in
Exhibit “A-2”) that (i) could materially restrict the ability of Purchaser to use the
Assets as currently used by Noble; or (ii) a reasonable and prudent Person engaged in the business
of the ownership, development and operation of oil and gas properties with the knowledge of all the
facts and their legal bearing would not be willing to accept and that could result in liability or
cost to Purchaser (excluding liabilities or costs arising from actions taken by Purchaser in the
ordinary course of business after the Closing) in excess of $1,000,000 in the aggregate.

     4.8 No Violation of Laws. Except as set forth on Schedule 4.8, where Noble is
the operator, and to Noble’s Knowledge in respect of Assets operated by others, the Assets are
being operated in compliance with all laws, rules and regulations of any Governmental Entity
applicable to such Assets, except where the failure to be in compliance would not have a Material
Adverse Effect.

     4.9 Royalties, Etc. Except as set forth on Schedule 4.9 and for such other
items that are being held in suspense that will be transferred to Purchaser pursuant to Section
11.2, all royalties, overriding royalties and other burdens on production due with respect to the
Assets have been paid. Except for revenues for which Noble has the right to net or offset against
costs or expenses owed to Noble, all revenues received by Noble or its Affiliates, in its or their
capacity as operator of the Assets, for the sale of Hydrocarbons attributable to any joint working
interest owner’s interests in the leases included in the Assets have been paid.

     4.10 Personal Property. To Noble’s Knowledge, except as set forth in Schedule
4.10, all personal property equipment and fixtures constituting a part of the Assets are in a
state of repair so as to be adequate for normal operations, except where such state of repair would
not have a Material Adverse Effect.

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     4.11 Consents. Except for (a) consents set forth in Schedule 4.11, (b)
Customary Post-Closing Consents, and (c) consents required to be obtained under contracts that are
terminable upon not greater than sixty (60) days notice without payment of any fee, there are no
consents required to be obtained by Noble from another Person to any assignment (in each case) that
would be applicable in connection with the transfer of the Assets or the consummation of the
transactions contemplated by this Agreement by Noble.

     4.12 Preferential Rights. Except as set forth in Schedule 4.12, there are no
preferential rights to purchase that are applicable to the transfer of the Assets in connection
with the transactions contemplated hereby.

     4.13 Current Commitments. Schedule 4.13 sets forth all authorities for
expenditures (“AFE”) relating to the Assets to drill or rework wells or for other capital
expenditures pursuant to any of the Material Contracts or any applicable joint operating agreement
that require aggregate expenditures in excess of $250,000 for the particular individual operation
or project (net to Noble’s interest) after the Effective Time.

     4.14 Environmental Orders/Notices.

          (a) Except as set forth in Schedule 4.14(a), with respect to the Assets, Noble has not
entered into, or is not subject to, any agreements, consents, orders, decrees, judgments, license
or permit conditions, or other directives of any Governmental Entity in existence as of the date of
this Agreement based on any Environmental Laws that relate to the future use of any of the Assets
and that require any change in the present conditions of any of the Assets.

          (b) Except as set forth in Schedule 4.14(b), Noble has not received and to Noble’s
Knowledge, no operator of the Assets has received written notice from any Person of any release,
disposal or incident concerning hazardous substances with respect to any land, facility, asset or
property included in the Assets that: (i) interferes with or prevents compliance by Noble with any
Environmental Law or the terms of any license or permit issued pursuant thereto; or (ii) gives rise
to or results in any common law or other liability of Noble to any Person which, in the case of
either clause (i) or (ii) hereof, would have a Material Adverse Effect.

          (c) To Noble’s Knowledge, all material reports, studies, written notices from environmental
Governmental Entities, tests, analyses, and other documents specifically addressing environmental
matters related to Noble’s ownership or operation of the Assets, which are in Noble’s possession,
have been made available to Purchaser.

     4.15 Gas Prepayment Arrangements; Take-or-Pay. Except for Imbalances, Noble is not
obligated by any gas prepayment arrangement, “take-or-pay” requirement or any other agreement with
respect to the Assets to deliver any gas at a future time without then or thereafter receiving
payment therefor.

     4.16 Production Taxes. Except as disclosed in Schedule 4.16, all ad valorem,
property, production, severance, and similar taxes and assessments (including penalties and

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interest) based on or measured by the ownership of the Assets, the production of Hydrocarbons,
or the receipt of proceeds therefrom that have become due and payable have been properly paid.

     4.17 Leases. Except as set forth on Schedule 4.17, with respect to the Assets
that are oil and gas leases (“Leases”) (but only to Noble’s Knowledge with respect to Leases not
operated by Noble):

          (a) the Leases have been maintained according to their terms, in compliance with all material
agreements to which the Leases are subject;

          (b) the Leases are presently in full force and effect; and

          (c) to the Knowledge of Noble, no other party to any Lease is in breach or default with
respect to any of its material obligations thereunder.

     4.18 Well Status. Except as set forth in Schedule 4.18, to Noble’s Knowledge,
there are no wells located on the Leasehold Interests that:

          (a) Noble is currently obligated by law or contract to plug and abandon; or

          (b) have been plugged and abandoned but have not been plugged or reclaimed in accordance with
all applicable requirements of each Governmental Entity having jurisdiction over the Assets.

     4.19 Suspense. Schedule 4.19 sets forth a list of all proceeds held in
suspense by Noble on the date hereof that are attributable to the Leasehold Interests, a
description of the source of such funds and the reason they are being held in suspense, the
agreement or agreements under which such funds are being held and the name or names of the parties
claiming such funds or to whom such funds are owed.

     4.20 Additional Representations and Warranties. Noble specifically and expressly
includes in its representations and warranties to Purchaser contained in this Article 4, those
representations and warranties included in Sections 3.7, 11.9 and 11.11.

ARTICLE 5

REPRESENTATIONS AND WARRANTIES OF PURCHASER

     Purchaser represents and warrants to Noble that:

     5.1 Existence. Purchaser is a limited partnership duly organized, validly existing,
and in good standing under the laws of the State of Delaware and is duly qualified to carry on its
business in the states or jurisdictions where the Assets are located.

     5.2 Power. Purchaser has the power and authority to enter into and perform this
Agreement and the transactions contemplated hereby. No suit, action or other proceeding by a third
party or a Governmental Entity is pending or threatened which seeks substantial damages from
Purchaser in connection with, or seeks to restrain, enjoin or otherwise prohibit, the

20

 

consummation of the transactions contemplated by this Agreement. Subject to applicable
requirements under the HSR Act, and to rights to consent by, required notices to, and filings with
or other actions by Governmental Entities where the same are customarily obtained subsequent to the
assignment of oil and gas interests and leases, the execution, delivery and performance of this
Agreement by Purchaser, and the transactions contemplated hereby, will not violate (a) any
provision of the limited partnership agreement or other formation documents of Purchaser, (b) any
material agreement or instrument to which Purchaser is a party or by which Purchaser is bound, (c)
any judgment, order, ruling, or decree applicable to Purchaser as a party in interest, or (d) any
law, rule or regulation applicable to Purchaser.

     5.3 Authorization. The execution, delivery and performance of this Agreement and the
transactions contemplated hereby have been duly and validly authorized by all requisite corporate
or partnership action (including all necessary approvals of any general partner of
Purchaser) on the part of Purchaser. This Agreement has been duly executed and delivered on
behalf of Purchaser, and at the Closing all documents and instruments required hereunder to be
executed and delivered by Purchaser shall have been duly executed and delivered. This Agreement
does, and such documents and instruments shall, constitute legal, valid and binding obligations of
Purchaser enforceable in accordance with their terms, subject, however, to the effect of
bankruptcy, insolvency, reorganization, moratorium and similar laws from time to time in effect
relating to the rights and remedies of creditors, as well as to general principles of equity
(regardless of whether such enforceability is considered in a proceeding in equity or at law).

     5.4 Brokers. Purchaser has incurred no obligation or liability, contingent or
otherwise, for brokers’ or finders’ fees in respect of the matters provided for in this Agreement
which will be the responsibility of Noble; and any such obligation or liability that might exist
shall be the sole obligation of Purchaser.

     5.5 Further Distribution. Purchaser is not acquiring the Leasehold Interests with a
view to, or for offer of resale in connection with, a non-exempt distribution thereof within the
meaning of the Securities Act of 1933, as amended, and the rules and regulations pertaining to it
or a distribution thereof in violation of any applicable securities laws. Purchaser covenants that
if in the future it should decide to dispose of any of its interest in the Assets, subject to any
restriction on assignment set forth herein or in the assignments delivered by Noble to Purchaser at
the Closing, Purchaser will do so only in compliance with any applicable federal and state
securities laws.

     5.6 Financial Statements. To the extent available, Purchaser has heretofore delivered
to Noble copies of Purchaser’s most recent audited financial statements and such financial
statements, if any, present fairly the financial position, results of operations and changes in the
financial position of Purchaser as of the dates, or for the periods, as applicable, indicated
thereon, and such financial statements, if any, have been prepared in conformity with GAAP (except
as otherwise noted therein). Since the date of such financial statements, if any, there has been no
material adverse change in the financial condition of Purchaser.

     5.7 Matters Affecting United States Minerals Management Service Approval. Purchaser
has no Knowledge of any matter or circumstance applicable to Purchaser that would

21

 

preclude or inhibit unconditional United States Minerals Management Service (“MMS”) approval
of the assignment of the Assets from Noble to Purchaser.

     5.8 Purchaser Financing. Purchaser has arranged to have available by the Closing,
sufficient funds to enable it to pay in full the Purchase Price as herein provided.

     5.9 Bankruptcy Proceedings. There are no bankruptcy, reorganization, insolvency, or
receivership actions pending, being contemplated by, or, to the Knowledge of Purchaser, threatened
against Purchaser.

     5.10 Additional Representations and Warranties. Purchaser specifically and expressly
includes in its representations and warranties to Noble, those representations and warranties
included in Section 17.18 and Section 17.20.

ARTICLE 6

PRE-CLOSING OBLIGATIONS OF NOBLE

     6.1 Operations. From the date of this Agreement until Closing (the “Interim Period”),
except as otherwise approved by Purchaser (which approval shall not be unreasonably withheld),
Noble (a) shall permit Purchaser to have access to those Assets operated by Noble and shall use
reasonable efforts to provide Purchaser access to those Assets not operated by Noble (which access
shall be subject to Section 7.4), (b) shall operate the Assets for which it is the operator in
accordance with past practices, (c) shall exercise reasonable diligence in safeguarding and
maintaining secure and confidential all geological maps, confidential reports and data in its
possession relating to the Assets, (d) shall not transfer, sell, hypothecate, encumber or otherwise
dispose of or encumber any of the Assets (other than Hydrocarbons in the ordinary course of
business or as required in connection with the exercise by third parties of preferential rights to
purchase any of the Assets), (e) shall maintain insurance now in force with respect to the Assets,
(f) shall consult with Purchaser in relation to any expenditure regarding the Assets that exceeds
$250,000, (g) before undertaking an operation or making a single expenditure in respect of the
Assets to be in excess of Two Hundred Fifty Thousand Dollars ($250,000), and before conducting an
operation to drill, sidetrack, deepen, complete, or recomplete a well (regardless of the estimated
cost) on any of the Leasehold Interests, shall submit an AFE for the operation or expenditure to
Purchaser for approval, (h) shall furnish an informational AFE to Purchaser for an operation or
single expenditure estimated to cost $250,000 or less, but in excess of $100,000, if Noble prepares
the same for its own use, and (i) shall notify Purchaser as soon as reasonably possible when it
appears the cost of an operation will exceed the original AFE by more than twenty percent (20%),
which notice shall be furnished to Purchaser as a supplemental AFE for informational purposes only
and is not subject to Purchaser’s approval. In addition, without the consent of Purchaser (which
shall not be unreasonably withheld or delayed), during the Interim Period, Noble shall not (i)
except with respect to matters retained by Noble pursuant to this Agreement, waive, compromise or
settle any right or claim for an amount in excess of $250,000 regarding the Assets or which may
reasonably be expected to have an adverse effect on the value of the Assets as a whole in excess of
$250,000, (ii) except in connection with AFEs, incur obligations with respect to the Assets for
which Purchaser would be responsible after the Effective Time, other than transactions (x) the
costs of which do not exceed $250,000

22

 

individually and which are of a nature consistent with past practices employed by Noble with
respect to the Assets, and/or (y) in connection with situations believed in good faith by Noble to
constitute an emergency (in which case Noble’s obligation is limited to notifying Purchaser as soon
as reasonably practicable of such emergency and obligations), (iii) except in connection with AFEs,
commit to capital expenditures or the acquisition or construction of fixed assets for which
Purchaser shall have financial responsibility in connection with the Assets in an amount
individually in excess of $250,000, except in connection with situations believed in good faith by
Noble to constitute an emergency (in which case Noble’s obligation is limited to notifying
Purchaser as soon as reasonably practicable of such emergency and obligations), (iv) enter into a
contract with an Affiliate of Noble or a contract with a term of greater than thirty (30) days
(which contracts regard the Assets) unless it can be terminated without penalty on no more than
thirty (30) days notice, or (v) terminate, or materially amend , or agree to terminate or
materially amend, any of the Material Contracts, except renewals or extensions of such contracts on
substantially the same terms. If Purchaser fails to provide such approval with respect to the
first sentence of this Section 6.1 or consent with respect to the second sentence of this Section
6.1 within ten (10) days (or such shorter period of time as may be reasonably required) of
receiving Noble’s written request therefor, then Purchaser shall be deemed to have approved of or
consented to the request set forth in such written notice.

     6.2 HSR Act. If applicable, Noble shall prepare and submit, in a timely manner, all
necessary filings for Noble in connection with the transactions contemplated by this Agreement that
may be required under the HSR Act and the rules and regulations thereunder. Noble shall request
expedited treatment of such filing by the Federal Trade Commission, shall promptly make any
appropriate or necessary subsequent or supplemental filings, and shall cooperate with Purchaser in
the preparation of such filings as are necessary and appropriate.

ARTICLE 7

PRE-CLOSING OBLIGATIONS OF PURCHASER

     7.1 Confidentiality. Purchaser shall cause (a) any information relating to the terms
of the transactions contemplated hereunder and (b) the information and data furnished or made
available by Noble to Purchaser and its officers, employees, representatives, Affiliates and
potential financing sources in connection with this Agreement or Purchaser’s investigation of the
Assets, in each case to be maintained in confidence and not to be used for any purpose other than
in connection with this Agreement or Purchaser’s investigation of the Assets; provided, however,
that the foregoing obligation shall terminate on the earlier to occur of (i) the Closing, (ii) such
time as the information or data in question is disclosed to Purchaser by a third party that is not
obligated to Noble to maintain same in confidence, or (iii) such time as the information or data in
question becomes generally available to the oil and gas industry other than through the breach of
the foregoing obligation. The obligations of Purchaser under this Section 7.1 shall be in addition
to, and not in lieu of, Purchaser’s obligations under the Confidentiality Agreement previously
executed by Noble and First Reserve Corporation. Notwithstanding anything to the contrary contained
in the Confidentiality Agreement, Purchaser acknowledges and agrees that the terms and provisions
of the Confidentiality Agreement shall not be superseded by the provisions of this Agreement, but
shall continue in full force and effect until the Closing of the transactions

23

 

described herein, at which time, such agreement shall automatically expire and be of no
further force and effect.

     7.2 Return of Data. Purchaser agrees that if this Agreement is terminated for any
reason whatsoever, Purchaser shall, at Noble’s request, promptly return to Noble all information
and data furnished by or on behalf of Noble to Purchaser, its officers, employees, representatives,
Affiliates and potential financing sources, in connection with the Assets or Purchaser’s
investigation of the Assets, and Purchaser shall deliver to Noble or destroy all copies, extracts
or excerpts of such information and data and all documents generated by Purchaser that contain any
portion of such information or data.

     7.3 Notice of Certain Title Matters and Imbalance. Purchaser shall notify Noble
promptly (but in no event to exceed five (5) days) upon Purchaser’s discovery prior to Closing of a
title benefit of the type described in Section 3.1(f) or of an Imbalance (in each case) resulting
in an increase in the Purchase Price hereunder.

     7.4 Indemnity Regarding Access. PURCHASER AGREES TO RELEASE, INDEMNIFY, DEFEND AND
HOLD HARMLESS NOBLE AND ITS AFFILIATES, AND ITS AND THEIR DIRECTORS, OFFICERS, EMPLOYEES, AGENTS
AND REPRESENTATIVES (COLLECTIVELY, THE “NOBLE INDEMNIFIED
PARTIES”) FROM AND AGAINST ANY AND ALL
CLAIMS, LIABILITIES, LOSSES, COSTS AND EXPENSES (INCLUDING, WITHOUT LIMITATION, COURT COSTS AND
REASONABLE ATTORNEYS’ FEES) (COLLECTIVELY “LOSSES”) IN CONNECTION WITH PERSONAL INJURIES, INCLUDING
DEATH, OR PROPERTY DAMAGE, ARISING OUT OF OR RELATING TO THE PRE-CLOSING ACCESS OF PURCHASER, ITS
AGENTS, EMPLOYEES, CONTRACTORS, PURCHASER’S ENVIRONMENTAL CONSULTANT AND OTHER REPRESENTATIVES TO
THE ASSETS AND TO OTHER INFORMATION RELATING THERETO AS PERMITTED UNDER THIS AGREEMENT, REGARDLESS
OF WHETHER SUCH INJURIES, DEATH OR DAMAGES ARE CAUSED IN WHOLE OR PART BY THE SOLE, PARTIAL,
CONCURRENT OR OTHER NEGLIGENCE, STRICT LIABILITY OR OTHER FAULT OF THE NOBLE INDEMNIFIED PARTIES,
EXCEPT TO THE EXTENT CAUSED BY ANY OF THE NOBLE INDEMNIFIED PARTIES’ GROSS NEGLIGENCE OR WILLFUL
MISCONDUCT. IT IS THE EXPRESS INTENTION OF THE PARTIES THAT THE INDEMNITY PROVIDED FOR BY THIS
SECTION 7.4 CONSTITUTES AN AGREEMENT BY PURCHASER TO INDEMNIFY AND PROTECT THE NOBLE INDEMNIFIED
PARTIES FROM THE CONSEQUENCES OF THEIR OWN NEGLIGENCE, STRICT LIABILITY, OR OTHER FAULT, REGARDLESS
OF WHETHER SAME IS THE SOLE OR A CONCURRENT CAUSE OF THE INJURY, DEATH OR DAMAGE, EXCEPT AND TO THE
EXTENT CAUSED BY ANY NOBLE INDEMNIFIED PARTY’S GROSS NEGLIGENCE OR WILLFUL MISCONDUCT. WITH RESPECT
TO THE NON-OPERATED ASSETS, PURCHASER FURTHER AGREES THAT ACCESS SHALL BE CONDITIONED UPON
PURCHASER, ITS AGENTS, EMPLOYEES, CONTRACTORS OR OTHER REPRESENTATIVES EXECUTING APPROPRIATE
BOARDING AGREEMENTS AS MAY BE REQUIRED BY THE OPERATOR OF ANY SUCH ASSETS.

24

 

     7.5 HSR Act. If applicable, Purchaser shall prepare and submit, in a timely manner,
all necessary filings for Purchaser in connection with the transactions contemplated by this
Agreement under the HSR Act and the rules and regulations thereunder. Purchaser shall request
expedited treatment of such filing by the Federal Trade Commission, shall promptly make any
appropriate or necessary subsequent or supplemental filings, and shall cooperate with Noble in the
preparation of such filings as are necessary and appropriate.

ARTICLE 8

NOBLE’S CONDITIONS OF CLOSING

     Noble’s obligation to consummate the transactions provided for herein is subject to the
satisfaction or waiver on or before the Closing Date of the following conditions:

     8.1 Representations and Warranties. The representations and warranties of Purchaser
contained in Article 5 shall be true and correct, to the extent qualified by materiality, in all
respects, and to the extent not so qualified, in all material respects, (in each case) as of the
Closing Date as though made on and as of that date.

     8.2 Performance. Purchaser shall have performed in all material respects each of the
obligations, covenants and agreements required hereunder to be performed by it at or prior to the
Closing.

     8.3 Officer or Attorney-in-Fact Certificate. Purchaser shall have delivered to Noble
a certificate of an officer or attorney-in-fact, dated the date of Closing, certifying on behalf of
Purchaser that the conditions set forth in Sections 8.1 and 8.2 have been fulfilled.

     8.4 Operatorship Forms. Purchaser shall have executed and delivered to Noble such
forms as may be required by any Governmental Entity having jurisdiction to evidence the change of
operatorship from Noble to Purchaser on all Leasehold Interests constituting a part of the Assets
that are operated by Noble.

     8.5 Bonds. Prior to Closing, Purchaser shall have delivered to Noble either: (a)(i)
copies of any bonds, in form and substance and issued and executed by a surety satisfactory to
Noble and the MMS, covering any Noble operated Leasehold Interests for which bonding is required
under any Applicable Laws of any Governmental Entities having jurisdiction over the Assets; or (ii)
a commitment by a surety satisfactory to Noble and the MMS to issue such bonds simultaneously with
Closing; and (b) copies of any supplemental bonds required by the MMS, in form and substance and
issued and executed by a surety satisfactory to Noble, sufficient to satisfy all plugging,
abandonment and restoration obligations relating to the Assets.

     8.6 Insurance. Purchaser shall have procured insurance policies providing the
coverage set forth in Schedule 8.6.

     8.7 Certificate of Authority. Purchaser shall deliver to Noble a Certificate of
Authority dated as of the Closing Date, certifying that the execution, delivery and performance of
the transactions contemplated hereby have been duly and validly authorized by all requisite action
on the part of Purchaser and that the individual(s) executing the documents contemplated

25

 

hereby have been duly and validly authorized to represent and bind the Purchaser in connection
therewith.

     8.8 Exemption Certificates. If applicable, Purchaser shall provide Noble with
properly executed exemption certificates or other documentation evidencing that the transfer of the
Assets to Purchaser is exempt from applicable sales or similar taxes.

     8.9 HSR Act. The Closing shall be permitted to occur without violation of the HSR
Act.

     8.10 Casualty Loss or Condemnation. No portion of the Assets shall have been damaged
or destroyed by a Casualty or taken in condemnation or under right of eminent domain where, in the
event of a Casualty, the cost to repair, replace or restore the affected Assts (such cost not to
exceed the Allocated Value of such affected Assets) to at least their condition prior to such
Casualty exceeds 40% of the Purchase Price or, in the case of such taking, the Allocated Value of
the affected Assets exceeds 40% of the Purchase Price.

     8.11 Purchase Price Adjustments. The sum of the amounts by which the Purchase Price
will be decreased pursuant to Section 2.2(b)(ii) and Section 2.2(b)(iii) (excluding any amounts
attributable to a Casualty or taking described in Section 3.11 for which Purchaser is entitled to
receive a Purchase Price reduction pursuant to Section 3.11) shall not be in excess of 25% of the
Purchase Price.

ARTICLE 9

PURCHASER’S CONDITIONS OF CLOSING

     Purchaser’s obligation to consummate the transactions provided for herein is subject to the
satisfaction or waiver on or before the Closing Date of the following conditions:

     9.1 Representations and Warranties. The representations and warranties of Noble
contained in Article 4 shall be true and correct, to the extent qualified by materiality, in all
respects, and to the extent not so qualified, in all material respects, (in each case) as of
Closing as though made on and as of that date.

     9.2 Performance. Noble shall have performed in all material respects each of the
obligations, covenants and agreements required hereunder to be performed by it at or prior to the
Closing.

     9.3 Officer or Attorney-in-Fact Certificate. Noble shall have delivered to Purchaser
a certificate of a corporate officer or attorney-in-fact, dated the date of Closing, certifying on
behalf of Noble that the conditions set forth in Sections 9.1 and 9.2 have been fulfilled.

     9.4 Litigation. There shall be no legal or arbitration proceedings against Noble or
involving the Assets, in either case with respect to which Noble has received service of process or
other written notice, that reasonably is expected to materially and adversely affect the value of
the Assets taken as a whole after the Effective Time.

26

 

     9.5 Certificate of Authority. Noble shall have delivered to Purchaser a Certificate
of Authority dated as of the Closing Date certifying that the execution, delivery and performance
of the transactions contemplated hereby have been duly and validly authorized by all requisite
action on the part of Noble and that the individuals executing the documents contemplated hereby
have been duly and validly authorized to represent and bind Noble in connection therewith.

     9.6 Operatorship Forms. Noble shall have executed and delivered to Purchaser such
forms as may be required by any governmental authority having jurisdiction to evidence the change
of operatorship from Noble to Purchaser on all Leasehold Interests constituting a part of the
Assets that are operated by Purchaser.

     9.7 HSR Act. The Closing shall be permitted to occur without violation of the HSR
Act.

     9.8 Casualty Loss. No portion of the Assets shall have been damaged or destroyed by a
Casualty or taken in condemnation or under right of eminent domain where, in the event of a
Casualty, the cost to repair, replace or restore the affected Assts (such cost not to exceed the
Allocated Value of such affected Assets) to at least their condition prior to such Casualty exceeds
40% of the Purchase Price or, in the case of such taking, the Allocated Value of the affected
Assets exceeds 40% of the Purchase Price.

     9.9 Purchase Price Adjustments. The sum of the amounts by which the Purchase Price
will be decreased pursuant to Section 2.2(b)(ii) and Section 2.2(b)(iii) (excluding any amounts
attributable to a Casualty or taking described in Section 3.11 for which Purchaser is entitled to
receive a Purchase Price reduction pursuant to Section 3.11) shall not be in excess of 25% of the
Purchase Price.

ARTICLE 10

CLOSING

     10.1 Time and Place of Closing. Subject to the conditions stated in this Agreement,
the consummation of the transactions contemplated hereby (the “Closing”) shall occur on June 30,
2006; provided, however, that if all of the conditions to Closing set forth in Articles 8 and 9
have not been satisfied or waived by such Time or any extended Time for Closing, the Party whose
obligations are subject to the conditions that have not been satisfied or waived shall have the
right to extend the Time of Closing for successive periods of up to seven (7) days each until such
conditions shall have been satisfied or waived, subject to Section 12.1(d). The Time Closing
actually occurs is herein called the “Closing Date.” The Closing shall be held at Fulbright &
Jaworski L.L.P.’s offices in Houston, Texas, or at such other location as may be mutually agreed
upon by Noble and Purchaser.

     10.2 Closing Obligations. At the Closing, the following events shall occur:

          (a) Noble shall execute, acknowledge and deliver to Purchaser the Assignment and Bill of Sale
in the form of (i) Schedule 10.2(a)(1) for the Assets located in the

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State of Texas, (ii) Schedule 10.2(a)(2) for the Assets located in the State of
Louisiana, (iii) Schedule 10.2(a)(3) for the Assets located in the State of Mississippi,
(iv) Schedule 10.2(a)(4) for the Assets located in the State of Alabama, (v) Schedule
10.2(a)(5) for the offshore Assets in which Noble has record title, and (vi) Schedule
10.2(a)(6) for the offshore Assets in which Noble has operating rights.

          (b) Noble and Purchaser shall execute, acknowledge and deliver transfer orders or letters in
lieu thereof directing all parties paying for production to make payment to Purchaser of proceeds
attributable to production after the Closing Date from the Leasehold Interests;

          (c) Purchaser shall make the payment(s) described in Section 2.3;

          (d) Noble shall execute and deliver a certificate certifying its non-foreign status in
accordance with Treasury Regulations §1.1445-2(b);

          (e) Purchaser shall deliver the certificates referenced in Section 8.3, Section 8.7 and
Section 8.8 and deliver a copy of the insurance coverage referenced in Section 8.6;

          (f) Noble shall deliver the certificates referenced in Section 9.3 and Section 9.5;

          (g) Purchaser and Noble shall execute and deliver the Transition Agreement described in
Section 11.6; and

          (h) Purchaser and Noble shall execute such other instruments and take such other action as may
be necessary to carry out their obligations under this Agreement.

     10.3 Post Closing Obligations. Noble shall, as soon as is reasonably possible after
the Closing, but in event within 30 Business Days thereafter, deliver to Purchaser, at Noble’s
offices, the Records (it being understood and agreed that Noble shall be entitled to retain a copy
of the Records and shall grant access to the Records to Purchaser until same are delivered to
Purchaser).

ARTICLE 11

ADDITIONAL AGREEMENTS

     11.1 Calculation of Adjusted Purchase Price. Within ninety (90) days after the
Closing Date, Noble shall prepare in good faith, in accordance with this Agreement and with GAAP,
and deliver to Purchaser a statement setting forth each adjustment to the Purchase Price required
pursuant to Section 2.2 and showing the calculation of each such adjustment. Within thirty (30)
days after receipt of such statement from Noble, Purchaser shall deliver to Noble a written report
containing all changes with explanations therefor that Purchaser proposes be made to such
statement, it being agreed that Purchaser’s failure to deliver such report to Noble within such
time period shall constitute acceptance by Purchaser of Noble’s statement. From and after the
expiration of such 30-day period, no additional changes to the statement provided by Noble shall be
considered by the Parties. If Purchaser has timely delivered such written report to Noble, the

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Parties shall then undertake to agree on the items in dispute and the final Adjusted Purchase
Price no later than thirty (30) days after the receipt by Noble of Purchaser’s statement of
proposed changes. Following the final determination of the Adjusted Purchase Price pursuant to
this Section 11.1, Noble or Purchaser, as the case may be, shall make the payment required pursuant
to Section 2.5.

     11.2 Suspended Funds. Noble has provided to Purchaser a listing showing all proceeds
from production attributable to the Leasehold Interests that are currently held in suspense and at
the Closing Noble shall transfer to Purchaser such suspended proceeds. Purchaser shall be
responsible for proper distribution of all such suspended proceeds to the parties lawfully entitled
to them, and hereby agrees to indemnify, defend and hold harmless Noble from and against any and
all Losses arising out of or relating to such suspended proceeds.

     11.3 Receipts and Credits. Subject to the terms hereof and except to the extent same
have already been taken into account as an adjustment to the Purchase Price, all monies, proceeds,
receipts, credits and income attributable to the Assets (a) for all periods of time subsequent to
the Effective Time, shall be the sole property and entitlement of Purchaser, and, to the extent
received by Noble, Noble shall fully disclose, account for and transmit same to Purchaser promptly
and (b) for all periods of time prior to the Effective Time, shall be the sole property and
entitlement of Noble and, to the extent received by Purchaser, Purchaser shall fully disclose,
account for and transmit same to Noble promptly. Subject to the terms hereof and except to the
extent same have already been taken into account as an adjustment to the Purchase Price, all costs
and operational expenses, attributable to the Assets (i) for periods of time prior to the Effective
Time, regardless of when due or payable, shall be the sole obligation of Noble and Noble shall
promptly pay, or if paid by Purchaser, promptly reimburse Purchaser for and hold Purchaser harmless
from and against same and (ii) for periods of time subsequent to the Effective Time, regardless of
when due or payable, shall be the sole obligation of Purchaser and Purchaser shall promptly pay, or
if paid by Noble, promptly reimburse Noble for and hold Noble harmless from and against same.
Except to the extent same have already been taken into account as an adjustment to the Purchase
Price, all uncollected accounts receivable as of the Closing Date attributable to the Assets after
the Effective Time shall be assigned to Purchaser, and all uncollected accounts receivable as of
the Closing Date attributable to the Assets prior to the Effective Time shall be retained by Noble.
It is understood and agreed that this Section 11.3 shall govern only the handling of revenues and
expenses of operations.

     11.4 Assumption of Liabilities; Cross Indemnity. If the Closing occurs, Noble and
Purchaser agree as follows:

          (a) Subject to the other express terms and conditions of this Agreement, Purchaser hereby
assumes and agrees to pay, perform and discharge the following liabilities and obligations
(collectively, the “Assumed Obligations”):

               (i) Except for the matters covered by the terms of Section 11.4(a)(ii), Section 11.4(c) and
Article 16, which shall control with respect to the matters covered thereby, Purchaser, from and
after the Closing Date, hereby assumes and shall be responsible for and agrees to release,
indemnify, defend and hold harmless the Noble Indemnified Parties from and

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against any and all Losses attributable to or arising out of the condition or operation of the
Assets before, on or after the Closing Date (including, without limitation, with respect to damage
to property, or injury to or death of persons, in each case occurring after the Closing Date but
attributable in whole or in part to conditions or operations that existed or occurred before the
Closing Date) including but not limited to Losses that are determined to be a result of or caused
in whole or in part by any of the Noble Indemnified Parties’ violation of, failure to fulfill
duties imposed by or incurrence of liability under Applicable Law, WITHOUT REGARD TO CAUSE OR ANY
NEGLIGENT ACTS OR OMISSIONS (INCLUDING SOLE NEGLIGENCE, CONCURRENT NEGLIGENCE OR STRICT LIABILITY),
BREACH OF DUTY (STATUTORY OR OTHERWISE), VIOLATION OF LAW, OR OTHER FAULT OF ANY OF THE NOBLE
INDEMNIFIED PARTIES, OR ANY PREEXISTING DEFECT; provided however, that Noble shall release,
indemnify, defend and hold harmless the Purchaser Indemnified Parties from and against any Losses
arising out of or attributable to, either directly or indirectly, the condition or operation of the
Assets at any time before the Closing Date to the extent and only to the extent that same are
determined to be the result of or caused by Noble’s violation of, failure to fulfill duties imposed
by or incurrence of liability under Applicable Law and further to the extent only that such Losses
are the result of a Third-Party (“Third-Party” shall not include Purchaser’s officers, Affiliates,
employees, contractors, agents, representatives or potential financing sources) claim, lawsuit or
administrative proceeding that is filed, issued or commenced against Purchaser within three hundred
sixty-five (365) days following the Closing Date.

               (ii) With respect to any and all Wells and facilities included in the Assets, including
without limitation, wells and facilities currently in use, and wells and facilities that have been
temporarily or permanently abandoned, Purchaser, from and after Closing, accepts sole
responsibility for same and agrees to pay all costs and expenses associated with plugging and
abandonment of all wells, decommissioning of all facilities included in the Assets, and clearing of
sites and restoring seabeds associated with the Assets, and may not claim the fact that plugging
and abandonment, decommissioning, site clearance or seabed restoration operations are not complete
or that additional costs and expenses are required to complete plugging and abandonment,
decommissioning, site clearance or seabed restoration operations as a breach of Noble’s
representations and warranties under this Agreement or the basis for any other redress against
Noble, and Purchaser (on behalf of Purchaser and its successors and assigns) irrevocably waives any
and all claims they may have against Noble associated with the same. PURCHASER, FROM AND AFTER THE
CLOSING DATE, HEREBY RELEASES THE NOBLE INDEMNIFIED PARTIES FROM AND SHALL FULLY PROTECT, DEFEND,
INDEMNIFY, AND HOLD THE NOBLE INDEMNIFIED PARTIES HARMLESS FROM AND AGAINST ANY AND ALL LOSSES
RELATING TO, ARISING OUT OF, OR CONNECTED WITH, DIRECTLY OR INDIRECTLY, PLUGGING AND ABANDONMENT OF
WELLS, DECOMMISSIONING OF FACILITIES, AND CLEARING OF SITES AND RESTORING SEABEDS ASSOCIATED WITH
THE ASSETS, NO MATTER WHETHER ARISING BEFORE OR AFTER THE EFFECTIVE TIME. THIS INDEMNITY AND
DEFENSE OBLIGATION WILL APPLY REGARDLESS OF CAUSE OR OF ANY NEGLIGENT ACTS OR OMISSIONS (INCLUDING
SOLE NEGLIGENCE, CONCURRENT NEGLIGENCE OR STRICT LIABILITY), BREACH OF DUTY (STATUTORY OR

30

 

OTHERWISE), VIOLATION OF LAW, OR OTHER FAULT OF ANY OF THE NOBLE INDEMNIFIED PARTIES, OR ANY
PREEXISTING DEFECT.

               (iii) Any and all obligations to make up, deliver or pay for Hydrocarbons under any gas
balancing or similar arrangements affecting the Assets in respect of amounts owed thereunder by
Noble as of the Effective Time.

          (b) EXCEPT FOR THE MATTERS COVERED BY SECTION 11.4(C) AND ARTICLE 16 (WHICH SHALL CONTROL WITH
RESPECT TO THE MATTERS COVERED THEREBY), PURCHASER AGREES, FROM AND AFTER THE CLOSING DATE, TO
RELEASE, INDEMNIFY, DEFEND AND HOLD HARMLESS THE NOBLE INDEMNIFIED PARTIES FROM AND AGAINST ANY AND
ALL LOSSES THAT ARE ATTRIBUTABLE TO (I) THE ASSUMED OBLIGATIONS OR (II) A BREACH BY PURCHASER OF
ANY OF ITS REPRESENTATIONS, WARRANTIES, COVENANTS OR AGREEMENTS HEREUNDER.

          (c) EXCEPT FOR THE MATTERS COVERED BY ARTICLE 16 (WHICH SHALL CONTROL WITH RESPECT TO THE
MATTERS COVERED THEREBY), NOBLE AGREES TO RELEASE, INDEMNIFY, DEFEND AND HOLD HARMLESS PURCHASER
AND ITS AFFILIATES, AND ITS AND THEIR, MEMBERS, DIRECTORS, OFFICERS, EMPLOYEES, AGENTS AND
REPRESENTATIVES (THE “PURCHASER INDEMNIFIED PARTIES”) FROM AND AGAINST ANY AND ALL LOSSES THAT ARE
ATTRIBUTABLE TO (I) A BREACH BY NOBLE OF ANY OF ITS REPRESENTATIONS, WARRANTIES, COVENANTS OR
AGREEMENTS HEREUNDER, (II) ANY LAWSUIT, CAUSE OF ACTION OR CLAIM, INCLUDING THE FIRST ITEM LISTED
ON SCHEDULE 4.9, ASSERTED BY A THIRD-PARTY RELATING TO THE ASSETS THAT IS RECEIVED BY, OR
FILED, ISSUED OR COMMENCED AGAINST, NOBLE OR ANY OF ITS AFFILIATES ON OR BEFORE THE CLOSING DATE,
(III) THE OWNERSHIP OR OPERATION OF THE ASSETS BEFORE THE EFFECTIVE TIME OR (IV) THE EXCLUDED
ASSETS, TO THE EXTENT ONLY THAT (A) PURCHASER PROVIDES NOBLE WITH A CLAIM NOTICE PRIOR TO THE
EXPIRATION OF THE SURVIVAL PERIOD FOR THE APPLICABLE REPRESENTATION, WARRANTY, AGREEMENT OR
COVENANT, AND (B) SUCH LOSSES UNDER (III) ABOVE ARE DETERMINED TO BE THE RESULT OF OR CAUSED BY
NOBLE’S VIOLATION OF APPLICABLE LAW OR FAILURE TO FULFILL DUTIES IMPOSED BY APPLICABLE LAW AND ONLY
TO THE EXTENT THAT SUCH LOSSES ARE THE RESULT OF A THIRD-PARTY CLAIM, LAWSUIT OR ADMINISTRATIVE
PROCEEDING THAT IS RECEIVED BY, OR FILED, ISSUED OR COMMENCED AGAINST, PURCHASER ON OR BEFORE THREE
HUNDRED SIXTY-FIVE (365) DAYS AFTER THE CLOSING DATE.

          (d) The indemnity, defense and hold harmless obligations set forth in Sections 11.4(b) and (c)
above shall not apply to (i) a claim for indemnification by a Party that relates to any amount or
item for which such Party received credit as an adjustment to the Purchase Price pursuant to the
provisions hereof and (ii) either Party’s costs and expenses with respect to the negotiation and
consummation of this Agreement and the transactions contemplated hereby.

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          (e) All claims for indemnification under this Agreement shall be asserted and resolved as
follows:

               (i) To make claim for indemnification under this Agreement, the Party having the right to be
indemnified (the “Indemnified Party”) shall notify the Party having the obligation to indemnify
another Party or parties (the “Indemnifying Party”) of its claim, including the specific basis for
its claim (the “Claim Notice”). In the event that the claim for indemnification is based upon a
claim by a Third Party against the Indemnified Party (a “Third Party Claim”), the Indemnified Party
shall provide its Claim Notice promptly after the Indemnified Party has actual knowledge of the
Third Party Claim and shall enclose a copy of all papers (if any) served with respect to the Third
Party Claim; provided that the failure of any Indemnified Party to give notice of a Claim as
provided in this Section 11.4(e) shall not relieve the Indemnifying Party of its obligations
hereunder except to the extent such failure materially prejudices the Indemnifying Party’s ability
to defend against the claim and then only to extent of such prejudice. If the claim for
indemnification is based upon an inaccuracy or breach of a representation, warranty, covenant or
agreement, the Claim Notice shall specify the representation, warranty, covenant or agreement that
was inaccurate or breached.

               (ii) In the case of a claim for indemnification based upon a Third Party Claim, the
Indemnifying Party shall have thirty (30) days from its receipt of the Claim Notice to notify the
Indemnified Party whether it admits or denies its liability to defend the Indemnified Party against
such Third Party Claim. The Indemnified Party is authorized, prior to and during such thirty (30)
day period, at the expense of the Indemnifying Party, to file any motion, answer or other pleading
that it shall deem necessary to protect its interests or those of the Indemnifying Party and that
is not prejudicial to the Indemnifying Party.

               (iii) If the Indemnifying Party admits its liability, it shall have the right and obligation
to diligently defend, at its sole cost, the Third Party Claim and the Indemnified Party may
participate in any defense or settlement of such Third Party Claim. An Indemnifying Party shall
not, without the written consent of the Indemnified Party, (A) settle any Third Party Claim or
consent to the entry of any judgment with respect thereto which does not include an unconditional
written release of the Indemnified Party from all liability in respect of such Third Party Claim or
(B) settle any Third Party Claim or consent to the entry of any judgment with respect thereto in
any manner that may materially and adversely affect the Indemnified Party (other than as a result
of money damages paid by the Indemnifying Party).

               (iv) If the Indemnifying Party does not admit its liability or admits its liability but fails
to diligently prosecute or settle the Third Party Claim, then the Indemnified Party shall have the
right to defend against the Third Party Claim at the sole cost of the Indemnifying Party. In such
a case, the Indemnified Party shall send written notice to the Indemnifying Party of any proposed
settlement of such Third Party Claim and the Indemnifying Party shall have the option for ten (10)
days following receipt of such notice to (A) admit in writing its liability for such Third Party
Claim and (B) if liability is so admitted, reject, in its reasonable judgment, the proposed
settlement.

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               (v) In the case of a claim for indemnification not based upon a Third Party Claim, the
Indemnifying Party shall have thirty (30) days from its receipt of the Claim Notice to (A) cure the
Losses complained of, (B) admit its liability for such Losses or (C) dispute the claim for such
Losses. If the Indemnifying Party does not notify the Indemnified Party within such thirty (30)
day period that it has cured the Losses or that it disputes the claim for such Losses, the amount
of such Losses shall conclusively be deemed a liability of the Indemnifying Party hereunder.

          (f) Notwithstanding anything hereinabove to the contrary, at all times Noble expressly assumes
and shall be responsible for and agrees to release, indemnify, defend and hold harmless Purchaser
from and against any and all Losses attributable to interests in the nature of an overriding
royalty interest, production payment, net profits interest or any other beneficial interest in oil
and or gas production or proceeds or the Leasehold Interests which is or may be claimed by any
individual that was or is an employee, officer, or director of Noble, its Affiliates, successors or
predecessors (“Noble Internal ORRIs”); if the net cumulative effect of such burdens operates to
reduce the Net Revenue Interest of Noble below the “Net Revenue Interest” or “NRI” set forth in
Exhibit “A” and Exhibit “A-1” for such Leasehold Interest or Well.

     11.5 Imbalances.

          (a) All Imbalances (whether for overproduction by Noble or underproduction by Noble) shall
pass to Purchaser as of the Effective Time, and except as provided in Section 2.2 and Section
11.5(b), Purchaser shall thereupon be entitled to and assumes all rights and obligations with
respect to any and all such Imbalances. Except as provided in Section 2.2 and Section 11.5(b),
there shall be no amounts paid to or from either Party to the other as a Purchase Price adjustment
or otherwise based on Imbalances. Except as provided in Section 2.2 and Section 11.5(b), Purchaser
from and after Closing accepts sole responsibility for and agrees to pay all costs and expenses
associated with Imbalances associated with the Assets, and Purchaser (on behalf of Purchaser and
its successors and assigns) irrevocably waives any and all claims it and they may have against
Noble associated with the same; and PURCHASER FROM AND AFTER THE CLOSING DATE RELEASES NOBLE FROM
AND SHALL FULLY PROTECT, DEFEND, INDEMNIFY AND HOLD NOBLE HARMLESS FROM AND AGAINST ANY AND ALL
LOSSES RELATING TO, ARISING OUT OF, OR CONNECTED WITH, DIRECTLY OR INDIRECTLY, IMBALANCES
ASSOCIATED WITH THE ASSETS, NO MATTER WHETHER ARISING BEFORE OR AFTER THE EFFECTIVE TIME. THIS
INDEMNITY AND DEFENSE OBLIGATION WILL APPLY REGARDLESS OF CAUSE OR OF ANY NEGLIGENT ACTS OR
OMISSIONS (INCLUDING SOLE NEGLIGENCE, CONCURRENT NEGLIGENCE OR STRICT LIABILITY), BREACH OF DUTY
(STATUTORY OR OTHERWISE), VIOLATION OF LAW, OR OTHER FAULT OF NOBLE, OR ANY PRE-EXISTING DEFECT.

          (b) In the event Purchaser shall determine prior to Closing that Imbalances under Section
2.2(a)(iii) are in the excess of 2.1 bcf of gas or that Imbalances under Section 2.2(b)(vii) are in
excess of .1 bcf of gas, then Purchaser shall promptly notify Noble of the amount of such excess.
Noble and Purchaser prior to the Closing Date shall endeavor to agree upon the amount of such
excess Imbalances. If the Parties shall have failed to agree thereupon

33

 

by the Closing Date, the Purchase Price shall not be adjusted therefor and the matter shall be
resolved by arbitration pursuant to Section 17.1.

     11.6 Transition Agreement. Purchaser and Noble shall execute and deliver the
Transition Agreement (in substantially the same form as Schedule 11.6) and Letters-in-Lieu
as provided in the Transition Agreement on the Closing Date.

     11.7 Further Assurances. After Closing, Noble and Purchaser agree to take such
further actions and to execute, acknowledge and deliver such additional documents and instruments
as may be necessary or useful in carrying out the purposes of this Agreement or of any document
delivered pursuant hereto.

     11.8 Material Contracts. If Closing occurs, Purchaser agrees to assume all of Noble’s
obligations from and after the Effective Time relating to the Orders and Contracts, as well as
Noble’s obligations under all leases, agreements, orders, instruments and documents relating to the
Assets which are : (a) of record or which are referenced in documents of record or in any of the
materials set forth on Exhibit “A-2” or (b) listed on an exhibit or schedule to this
Agreement.

     11.9 Marketing Contracts and Calls on Production. Except as disclosed on Schedule
11.9, Noble represents that (a) to Noble’s Knowledge, Noble is not a party to any contract for
the sale and marketing of hydrocarbons produced from or attributable to the Assets which has a term
in excess of thirty (30) days; and (b) there are no calls on, or other rights to purchase,
Hydrocarbons produced from or attributable to the Assets, whether or not the same are currently
being exercised.

     11.10 Gas Processing Arrangement. Notwithstanding anything to the contrary contained
herein, Noble shall retain its present ownership interest in all gas processing plants and
facilities.

     11.11 Payout Balances. Noble represents that the payout balances on Wells in which a
reversionary interest is applicable are set forth on Schedule 11.11.

     11.12 Employee and Benefit Matters.

          (a) Prior to the expiration of fifteen (15) Business Days after the date hereof, Noble shall
deliver to Purchaser a list of certain employees of Noble or its Affiliates who provide services
primarily in connection with the Assets (such employees being collectively the “Business
Employees”). At the request of Purchaser, from and after the date Purchaser receives such list
from Noble until five (5) Business Days prior to the Closing Date, Noble and such Affiliates shall
make the Business Employees available to Purchaser at reasonable times to discuss potential
employment with Purchaser or an Affiliate of Purchaser. Purchaser or an Affiliate may offer
employment (which shall be effective as of and contingent on the occurrence of the Closing) to each
Business Employee at a base salary or hourly rate and employee benefits that are substantially
similar to the current base salary or hourly rate of Purchaser or its Affiliate’s similarly
situated employees and, unless otherwise agreed by the employee, to provide

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the same or substantially similar services and at the same location or locations of
employment. Each offer of employment to a Business Employee shall be consistent with the
provisions of this Section 11.12(a). On or before the date that is five (5) Business Days prior to
the Closing Date, Purchaser shall notify Noble which Business Employees have accepted offers of
employment with Purchaser or its Affiliate, and which Business Employees have rejected such offers
of employment. The employment with Purchaser or an Affiliate of Purchaser of each Business
Employee who accepts such employment shall be effective as of the Closing Date.

          (b) To the extent that any obligations or liabilities under the Worker Adjustment and
Retraining Notification Act or other similar state laws relating to plant or facility closings or
otherwise regulating the termination of employment of employees arise as a consequence of the
Transactions contemplated by this Agreement (collectively, “WARN Obligations”), the Parties hereby
agree that Noble and its Affiliates shall be responsible for any WARN Obligations arising as a
result of any employment losses of Business Employees occurring on or prior to the Closing Date,
and Purchaser and its Affiliates shall be responsible for any WARN Obligations arising as a result
of any employment losses of Business Employees occurring after the Closing Date. Notwithstanding
the foregoing, Purchaser shall make a sufficient number of offers of employment pursuant to Section
11.12(a) above such that if all such offers are accepted, the WARN Obligations would not apply to
the transactions contemplated by this Agreement.

          (c) Purchaser shall cause each Business Employee who accepts an offer of employment made
pursuant to Section 11.12(a) (a “Continuing Employee”) and such Continuing Employee’s eligible
dependents (including all such Continuing Employee’s dependents covered immediately prior to the
Closing Date by a group health plan maintained by Noble or its Affiliates) to be eligible to be
covered under group health, prescription drug, dental and similar type welfare benefit plans
maintained by Purchaser or an Affiliate of Purchaser for the benefit of its similarly situated
employees that (i) provide benefits to the Continuing Employee and such eligible dependents
effective immediately upon the Closing Date and (ii) credit such Continuing Employee, for the
calendar year during which such coverage under such plans begin, with any deductibles and
co-payments already incurred during such calendar year under plans that provide similar benefits
maintained by Noble or its Affiliates. Purchaser shall cause each group health plan sponsored by
Purchaser or one of its Affiliates that a Continuing Employee may be eligible to participate in on
or after the Closing Date to waive any preexisting condition exclusions applicable to such
Continuing Employee and his eligible dependents.

          (d) Purchaser shall cause the employee benefit plans and programs maintained after the Closing
by Purchaser and its Affiliates for the benefit of its similarly situated employees to recognize
and give credit for each Continuing Employee’s years of service and level of seniority prior to the
Closing Date with Noble and its Affiliates (including service and seniority with any other employer
that was recognized by Noble or its Affiliates) for purposes of terms of employment and
eligibility, vesting, benefit accrual (other than benefit accrual under a defined benefit pension
plan) and benefit determination under such plans and programs, including paid vacation, paid sick
time, severance benefits and employer contribution rates under retirement plans.

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     11.13 Amendment of Schedules. Noble may, from time to time, prior to the Closing, by
written notice to Purchaser, supplement or amend the schedules and exhibits attached hereto (other
than Exhibit “B” and Schedules 2.4(a), 3.1(c), 8.6,
10.2(a)(1)-(6) and 11.6) to include matters relating to Noble or the Assets that
arises or occurs after the date hereof and does not result from a breach by Noble of Section 6.1;
provided that such amendment shall be disregarded for the purposes of Section 9.1 and Section
12.1(c) to the extent that (a) the same would materially adversely affect Purchaser’s rights under
this Agreement, or (b) result in an adjustment to the Purchase Price pursuant to Section 2.2.

     11.14 Gas Processing. As a condition to Closing, at the Closing, Purchaser and Noble
will enter into an agreement pursuant to which Noble or its Affiliates will provide to Purchaser
(a) at no economic burden to Purchaser or its Affiliates (as the case may be) beyond that which
Noble or its Affiliate bears as of the Effective Time, the right to process all the gas produced
from the Assets at gas processing plants owned by Noble or its Affiliates or to which Noble or its
Affiliates have the right to use (in each case) as of the Effective Time that were processing gas
produced from the Assets as of the Effective Time, such right being subject to the processing
capacity at such plants in existence as of the Effective Time (subject further to annual equity
re-determination at such plants) and to all obligations to process gas at such plants under
commitments or agreements in existence as of the Effective Time, (b) at no economic burden to
Purchaser or its Affiliates (as the case may be) beyond that which Noble or its Affiliate bears as
of the Effective Time, the right to cause all the gas produced from the Assets to be separated at
separation facilities owned by Noble or its Affiliates or to which Noble or its Affiliates have the
right to use (in each case) as of the Effective Time that were separating gas produced from the
Assets as of the Effective Time, such right being subject to the capacity at such facilities as of
the Effective Time (subject further to annual equity re-determination at such plants) and to all
obligations to separate gas at such facilities under commitments or agreements in existence as of
the Effective Time, and (c) the right to use shore-based facilities supporting the operations of
the Assets at market rates. Such agreement shall also contain such other terms and conditions as
the Parties may mutually agree.

     11.15 Description of Parties’ Intent. The Parties acknowledge that (a) it is the
intent of the Parties that Noble sell to Purchaser and that Purchaser purchase all of the assets
owned by Noble for the ownership and operation of the Leasehold Interests except for the Excluded
Assets, and (b) the exhibits attached to this Agreement describing the Assets may incorrectly
describe or omit to describe such assets. The Parties acknowledge that such exhibits (and subject
to Section 11.13, the schedules) will be updated from time to time in connection with Purchaser’s
due diligence and so as to correctly reflect the Parties’ intent as stated above.

ARTICLE 12

TERMINATION

     12.1 Right of Termination. This Agreement and the transactions contemplated hereby
may be terminated:

          (a) At any time at or prior to Closing by mutual consent of Noble and Purchaser;

36

 

          (b) by Noble, at Noble’s option, if any of the conditions set forth in Article 8 have not been
satisfied on or before the Closing Date and such conditions remain unsatisfied for a period of ten
(10) days following written notice thereof from Noble to Purchaser (with the Closing Date being
extended until the expiration of such cure period or the satisfaction of such conditions, whichever
is earlier);

          (c) by Purchaser, at Purchaser’s option, if any of the conditions set forth in Article 9 have
not been satisfied on or before the Closing Date and such conditions remain unsatisfied for a
period of ten (10) days following written notice thereof from Purchaser to Noble (with the Closing
Date being extended until the expiration of such cure period or the satisfaction of such
conditions, whichever is earlier); or

          (d) by Noble or Purchaser if the Closing shall not have occurred on or before July 31, 2006;

provided, however, that no Party shall have the right to terminate this Agreement pursuant to
clause (b), (c) or (d) above if such Party or its Affiliates are at such time in material breach of
any provision of this Agreement.

     12.2 Effect of Termination. If this Agreement is terminated pursuant to Section 12.1,
this Agreement shall become void and of no further force or effect, except for the provisions of
Sections 7.1, 7.2, 7.3, 7.4, 12.2, 17.2 through 17.10, 17.12, 17.13 and 17.15, which shall survive
such termination and continue in full force and effect and the Parties shall have no liability or
obligation hereunder except and to the extent such termination results from the material breach by
a Party of this Agreement; provided that if Noble is entitled to the Deposit as liquidated damages
pursuant to Article 2, then such retention shall constitute full and complete satisfaction of any
and all damages and remedies Noble may have against Purchaser.

ARTICLE 13

TAXES

     13.1 Apportionment of Ad Valorem and Property Taxes. All ad valorem taxes, real
property taxes, personal property taxes and similar obligations (“Property Taxes”) attributable to
the Assets with respect to the tax period in which the Effective Time occurs shall be apportioned
as of the Effective Time between Noble and Purchaser. The owner of record on the assessment date
shall file or cause to be filed all required reports and returns incident to the Property Taxes and
shall pay or cause to be paid to the taxing authorities all Property Taxes relating to the tax
period on which the Effective Time occurs. If Noble is the owner of record on the assessment date,
then Purchaser shall pay to Noble Purchaser’s pro rata portion of Property Taxes within thirty (30)
days after receipt of Noble’s invoice therefor, except to the extent taken into account as an
adjustment to the Purchase Price pursuant to Section 2.2. If Purchaser is the owner of record as of
the assessment date then Noble shall pay to Purchaser Noble’s pro rata portion of Property Taxes
within thirty (30) days after receipt of Purchaser’s invoice therefor.

     13.2 Sales Taxes. The Purchase Price provided for hereunder excludes any sales taxes
or other taxes required to be paid in connection with the sale of the Assets pursuant to this

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Agreement. Purchaser, however, shall be liable for any sales and use taxes, conveyance,
transfer and recording fees and real estate transfer stamps or taxes that may be imposed on any
transfer of the Assets pursuant to this Agreement. Noble shall, in accordance with Applicable Law,
collect and remit any sales, gross receipts and similar taxes that are required to be paid as a
result of the transfer of the Assets by Noble to Purchaser.

     13.3 Other Taxes. All taxes (other than income and franchise taxes) attributable to
the Assets that are imposed on or with respect to the production of Hydrocarbons or the receipt of
proceeds therefrom (including but not limited to severance, production, and excise taxes) shall be
apportioned between the Parties based upon the respective shares of production taken by the
Parties. All such taxes that have accrued with respect to the period prior to the Closing Date have
been or will be properly paid or withheld by Noble (although such taxes for the period between the
Effective Time and the Closing Date will be taken into account as an adjustment to the Purchase
Price pursuant to Section 2.2(a)) and all statements, returns, and documents pertinent thereto have
been or will be properly filed. Purchaser shall be responsible for paying or withholding or
causing to be paid or withheld all such taxes which have accrued after the Closing Date and for
filing all statements, returns, and documents incident thereto.

     13.4 Cooperation. Each Party shall provide the other Party with reasonable access to
all relevant documents, data and other information (other than that which is subject to an
attorney-client privilege) which may be required by the other Party for the purpose of preparing
tax returns, filing refund claims and responding to any audit by any taxing jurisdiction. Each
Party shall cooperate with all reasonable requests of the other Party made in connection with
contesting the imposition of taxes. Notwithstanding anything to the contrary in this Agreement,
neither Party shall be required at any time to disclose to the other Party any tax return or other
confidential tax information. Except where disclosure is required by Applicable Law, any
information obtained by a Party pursuant to this Section 13.4 shall be kept confidential by such
Party, except to the extent disclosure is required in connection with the filing of any tax returns
or claims for refund or in connection with the conduct of an audit, or other proceedings in
response to an audit, by a taxing jurisdiction.

ARTICLE 14

DOCUMENT RETENTION

     14.1 Inspection. As used in this Article 14, “Documents” shall mean all files,
documents, books, data and records delivered to Purchaser by Noble pursuant to the provisions of
this Agreement, including, but not limited to: financial and tax accounting records; land, title
and division of interest files; contracts; engineering and well files; and books and records
related to the operation of the Assets during the Interim Period. Subject to the provisions of
Section 14.2, Purchaser agrees that the Documents shall be open for inspection by representatives
of Noble at reasonable times and upon reasonable notice during regular business hours for a period
of 10 years following the date of Closing (or for such longer period as may be required by law or
governmental regulation), and that Noble may during such period at its expense make such copies
thereof as it may reasonably request.

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     14.2 Destruction. For a period of 10 years after the date of Closing (or for such
longer period as may be required by Applicable Law), Purchaser shall not destroy or give up
possession of any original or final copy of the Documents without first offering Noble the
opportunity (by delivery of written notice to Noble as provided in Section 17.7, with an additional
copy of such notice delivered to the attention of Noble’s Tax Department), at Noble’s expense
(without any payment to Purchaser), to obtain such original or final copy or a copy thereof. After
the conclusion of such period, Purchaser shall offer to deliver to Noble, at Noble’s expense
(without any payment to Purchaser), the Documents prior to destroying same.

ARTICLE 15

INDEPENDENT INVESTIGATION AND DISCLAIMER

     15.1 Independent Investigation and Disclaimer. Purchaser acknowledges that (a) it has
had access to the Assets and the employees of Noble and (b) in making the decision to enter into
this Agreement and consummate the transactions contemplated hereby, Purchaser has relied solely on
the basis of its own independent investigation of the Assets and upon the express representations,
warranties, covenants and agreements set forth in this Agreement. Accordingly, Purchaser
acknowledges that, except as expressly set forth herein, Noble has not made, AND NOBLE HEREBY
EXPRESSLY DISCLAIMS AND NEGATES, EXCEPT FOR THE EXPRESS REPRESENTATIONS AND WARRANTIES SET FORTH IN
THIS AGREEMENT, ANY REPRESENTATION OR WARRANTY, EXPRESS, IMPLIED, AT COMMON LAW, BY STATUTE, OR
OTHERWISE RELATING TO (i) THE CONDITION OF, OR FIELD OR ADMINISTRATIVE PRACTICES INVOLVING, THE
ASSETS (INCLUDING WITHOUT LIMITATION, ANY IMPLIED OR EXPRESS WARRANTY OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, OR OF CONFORMITY TO MODELS OR SAMPLES OF MATERIALS, OR ENVIRONMENTAL
CONDITION, OR THE CALCULATION OR PAYMENT OF ROYALTY OR SIMILAR OBLIGATIONS), (ii) ANY INFRINGEMENT
OF ANY PATENT OR PROPRIETARY RIGHT OF ANY THIRD PARTY, OR (iii) ANY INFORMATION, DATA OR OTHER
MATERIALS (WRITTEN OR ORAL) FURNISHED TO PURCHASER BY OR ON BEHALF OF NOBLE (INCLUDING, WITHOUT
LIMITATION, IN RESPECT OF GEOLOGICAL, GEOPHYSICAL AND SEISMIC DATA, THE EXISTENCE OR EXTENT OF OIL,
GAS OR OTHER MINERAL RESERVES, THE RECOVERABILITY OF OR THE COST OF RECOVERING ANY SUCH RESERVES,
THE VALUE OF SUCH RESERVES, ANY PRODUCT PRICING ASSUMPTIONS, AND THE ABILITY TO SELL OIL OR GAS
PRODUCTION AFTER THE EFFECTIVE TIME AND THE ABILITY OF PURCHASER TO BECOME OPERATOR OF THE ASSETS
UNDER THE APPLICABLE OPERATING AGREEMENT); AND PURCHASER WILL HAVE SOLE RESPONSIBILITY FOR ANY
ACTION TAKEN BY PURCHASER, OR BY OTHERS RELYING ON PURCHASER’S ADVICE, IN CONNECTION WITH THE
OWNERSHIP OR OPERATION OF THE ASSETS AFTER THE CLOSING DATE OR BASED ON THE GEOLOGICAL MAPS,
RECORDS, LOGS AND OTHER DATA, IF ANY, TRANSFERRED OR MADE AVAILABLE UNDER THIS AGREEMENT; provided,
however, that the foregoing disclaimer and negation of representations and warranties shall not
affect or impair the representations and warranties of Noble set forth in Article 4 hereof. As used
in this Section 15.1, “Noble” shall include Noble’s agents and representatives.

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ARTICLE 16

ENVIRONMENTAL INDEMNITY

     16.1 Physical and Environmental Conditions. Purchaser agrees and acknowledges that
(a) it has had, access to and the opportunity to inspect the Assets for all purposes, including,
without limitation, the purposes of determining environmental compliance and detecting the presence
of hazardous or toxic substances, pollutants or other contaminants, environmental hazards,
naturally occurring radioactive materials (NORM) and produced water contamination of the surface
and/or subsurface, (b) subject to Purchaser’s remedies hereunder, it has satisfied itself as to the
physical and environmental condition of the Assets, both surface and subsurface, and their method
of operation and environmental compliance and except as set forth herein, and Purchaser agrees to
accept an assignment of the Assets at Closing on an “AS IS, WHERE IS” basis, “WITH ALL FAULTS” and
(c) except for Noble’s representations and warranties set forth in this Agreement, in making the
decision to enter in this Agreement and consummate the transactions contemplated hereby, Purchaser
has relied solely on the basis of its own independent investigation of the Assets and the records
related thereto.

     16.2 General Environmental Indemnity. If the Closing occurs, except as provided in
the last clause of this Section 16.2 and without limiting Noble’s representations and warranties
set forth in this Agreement or Purchaser’s obligations under Section 11.4, Purchaser from and after
the Closing Date hereby assumes and shall be responsible for and agrees to RELEASE, INDEMNIFY,
DEFEND AND HOLD HARMLESS THE NOBLE INDEMNIFIED PARTIES FROM AND AGAINST ANY AND ALL LOSSES
ATTRIBUTABLE TO ENVIRONMENTAL COMPLIANCE, DAMAGE TO PROPERTY, INJURY TO OR DEATH OF PERSONS OR
OTHER LIVING THINGS, NATURAL RESOURCE DAMAGES, CERCLA RESPONSE COSTS, ENVIRONMENTAL REMEDIATION AND
RESTORATION COSTS, OR FINES OR PENALTIES (COLLECTIVELY, “ENVIRONMENTAL CLAIMS”) ARISING OUT OF OR
ATTRIBUTABLE TO, IN WHOLE OR IN PART, EITHER DIRECTLY OR INDIRECTLY, THE ENVIRONMENTAL CONDITION OR
COMPLIANCE OF THE ASSETS AT ANY TIME BEFORE, AT OR AFTER THE CLOSING DATE (INCLUDING, WITHOUT
LIMITATION, ANY CLAIMS RELATING TO ANY CONDITION EXISTING ON, IN OR UNDER, OR RESULTING FROM
OPERATION OF, THE ASSETS AT ANY TIME BEFORE, AT OR AFTER THE CLOSING DATE) THAT IS DETERMINED TO BE
A RESULT OF OR CAUSED IN WHOLE OR IN PART BY NOBLE’S VIOLATION OF, FAILURE TO FULFILL DUTIES
IMPOSED BY OR INCURRENCE OF LIABILITY UNDER, ANY ENVIRONMENTAL LAWS OR UNDER ANY PRINCIPLE OF
COMMON LAW RELATING TO DUTIES TO PROTECT OR NOT UNDULY DISTURB HUMAN HEALTH OR ENVIRONMENTAL
QUALITY; PROVIDED, HOWEVER, THAT NOBLE SHALL RELEASE, INDEMNIFY, DEFEND AND HOLD HARMLESS THE
PURCHASER INDEMNIFIED PARTIES FROM AND AGAINST ANY CLAIM ARISING OUT OF OR ATTRIBUTABLE TO, IN
WHOLE OR IN PART, EITHER DIRECTLY OR INDIRECTLY, THE ENVIRONMENTAL CONDITION OR COMPLIANCE OF THE
ASSETS AT ANY TIME BEFORE THE CLOSING DATE THAT IS DETERMINED TO BE THE RESULT OF OR CAUSED IN
WHOLE OR IN PART BY NOBLE’S VIOLATION OF, FAILURE TO FULFILL DUTIES IMPOSED BY OR INCURRENCE OF
LIABILITY UNDER, ANY ENVIRONMENTAL LAWS (AS IN EFFECT ON THE EFFECTIVE TIME) OR UNDER ANY

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PRINCIPLE OF COMMON LAW (AS IN EFFECT ON THE EFFECTIVE TIME) RELATING TO DUTIES TO PROTECT OR
NOT UNDULY DISTURB HUMAN HEALTH OR ENVIRONMENTAL QUALITY (OTHER THAN ANY SUCH CLAIMS RESULTING FROM
OR ATTRIBUTABLE IN WHOLE OR IN PART TO CONDITIONS OR OPERATIONS DISCLOSED IN THE ENVIRONMENTAL
REPORTS OR KNOWN TO PURCHASER AS OF THE DATE HEREOF), TO THE EXTENT THAT (A) SUCH CLAIM HAS BEEN
FINALLY DETERMINED IN A THIRD-PARTY LAWSUIT OR ADMINISTRATIVE PROCEEDING OR ORDER THAT IS RECEIVED
BY, OR FILED, ISSUED OR COMMENCED AGAINST, PURCHASER WITHIN SIXTY (60) DAYS FOLLOWING THE CLOSING
DATE AND (B) THE LOSSES RESULTING FROM SUCH CLAIM EXCEED $100,000 AND ANY UNUSED PORTION OF THE
DEDUCTIBLE AMOUNT.

ARTICLE 17

MISCELLANEOUS

     17.1 Dispute Resolution.

          (a) Each Party shall have the right to submit claims, disputes, controversies or other matters
in question arising out of the matters covered by Article 3 (including the existence of Title
Defects or the Title Defect Amounts attributable thereto, or Environmental Defects, or the
Environmental Defect Value attributable thereto, as applicable) (“Disputes”), to an independent
expert appointed in accordance with this Section 17.1(a) (the “Independent Expert”), who shall
serve as sole arbitrator. The Independent Expert shall be appointed by mutual agreement of Noble
and Purchaser from among candidates with experience and expertise in the area that is the subject
of such Dispute, and failing such agreement, such Independent Expert for such Dispute shall be
selected in accordance with the Rules. Disputes to be resolved by an Independent Expert (other
than those relating to the existence of Title Defects or the Title Defect Amounts attributable
thereto, or Environmental Defects, or the Environmental Defect Value attributable thereto, as
applicable, which shall be resolved in accordance with the procedures set forth in Section 17.1(c))
shall be resolved in accordance with mutually agreed procedures and rules and failing such
agreement, in accordance with the rules and procedures for arbitration provided in Section 17.1(b).
The Independent Expert shall be instructed by the Parties to resolve such Dispute as soon as
reasonably practicable in light of the circumstances. The decision and award of the Independent
Expert shall be binding upon the Parties as an award under the Federal Arbitration Act and final
and nonappealable to the maximum extent permitted by Applicable Law, and judgment thereon may be
entered in a court of competent jurisdiction and enforced by any Party as a final judgment of such
court.

          (b) Any Dispute that is not resolved pursuant to other mutually agreed procedures and rules
pursuant to Section 17.1(a) (other than those relating to the existence of Title Defects or the
Title Defect Amounts attributable thereto, or Environmental Defects, or the Environmental Defect
Value attributable thereto, as applicable, which shall be resolved in accordance with the
procedures set forth in Section 17.1(c)) shall be settled exclusively and finally by arbitration in
accordance with the procedures set forth in this Section 17.1(b).

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               (i) Such arbitration shall be conducted pursuant to the Federal Arbitration Act, except as
expressly provided otherwise in this Agreement. The validity, construction, and interpretation of
this Section 17.1(b), and all procedural aspects of the arbitration conducted pursuant hereto,
including the determination of the issues that are subject to arbitration (i.e., arbitrability),
the scope of the arbitrable issues, allegations of “fraud in the inducement” to enter into this
Agreement or this arbitration provision, allegations of waiver, laches, delay or other defenses to
arbitrability, and the rules governing the conduct of the arbitration (including the time for
filing an answer, the time for the filing of counterclaims, the times for amending the pleadings,
the specificity of the pleadings, the extent and scope of discovery, the issuance of subpoenas, the
times for the designation of experts, whether the arbitration is to be stayed pending resolution of
related litigation involving third parties not bound by this Agreement, the receipt of evidence,
and the like), shall be decided by the Independent Expert. The arbitration administered by the
Independent Expert shall be conducted pursuant to the Commercial Arbitration Rules of the American
Arbitration Association (the “Rules”), except as expressly provided otherwise in this Agreement.
The arbitration proceedings shall be subject to any optional rules contained in the Rules for
emergency measures and, in the case of Disputes with respect to amounts in excess of $1,000,000,
optional rules for large and complex cases.

               (ii) The Independent Expert shall permit and facilitate such discovery as he/she determines is
appropriate in the circumstances, taking into account the needs of the parties and the desirability
of making discovery expeditious and cost-effective. Such discovery may include pre-hearing
depositions, particularly depositions of witnesses who will not appear personally to testify, if
there is a demonstrated need therefor. The Independent Expert may issue orders to protect the
confidentiality of proprietary information, trade secrets and other sensitive information disclosed
in discovery.

               (iii) All arbitration proceedings hereunder shall be conducted in Houston, Texas or such other
mutually agreeable location.

               (iv) In deciding the substance of the Dispute, the Independent Expert shall refer to the
substantive laws of the State of Texas for guidance (excluding choice-of-law principles that might
call for the application of the laws of another jurisdiction). Matters relating to arbitration
shall be governed by the Federal Arbitration Act.

               (v) The Parties shall request the Independent Expert to conduct a hearing as soon as
reasonably practicable after appointment and to render a final decision completely disposing of the
Dispute that is the subject of such proceedings as soon as reasonably practicable after the final
hearing. The Parties shall instruct the Independent Expert to impose time limitations he/she
considers reasonable for each phase of such proceeding, including, without limitation, limits on
the time allotted to each Party for the presentation of its case and rebuttal. The Independent
Expert shall actively manage the proceedings as he/she deems best so as to make the proceedings
fair, expeditious, economical and less burdensome than litigation. To provide for speed and
efficiency, the Independent Expert may: (A) limit the time allotted to each Party for presentation
of its case; and (B) exclude testimony and other evidence they deem irrelevant or cumulative.

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               (vi) Notwithstanding any other provision in this Agreement to the contrary, the Parties
expressly agree that the Independent Expert shall have absolutely no authority to award
consequential, incidental, special, treble, exemplary or punitive damages of any type under any
circumstances regardless of whether such damages may be available under Texas law, or any other
laws, or under the Federal Arbitration Act or the Rules.

               (vii) The Parties shall request that final decision of the Independent Expert be in writing,
be as brief as possible, set forth the reasons for such final decision, and if the Independent
Expert awards monetary damages to either Party, contain a certification by the Independent Expert
that they have not included any consequential, incidental, special, treble, exemplary or punitive
damages. To the fullest extent permitted by Applicable Law, the arbitration proceeding and the
Independent Expert’s decision and award shall be maintained in confidence by the Parties and the
Parties shall instruct the Independent Expert to likewise maintain such matters in confidence.

          (c) In the event of any dispute relating to the existence of Title Defects or the Title Defect
Amounts attributable thereto, or Environmental Defects, or the Environmental Defect Value
attributable thereto, the Parties shall promptly negotiate in good faith in attempt to resolve such
Dispute. In the event the Parties are unable to resolve such Dispute the parties shall promptly
select an Independent Expert and each Party shall present a written statement of its position with
respect to such Dispute and any supporting documentation to the Independent Expert within ten (10)
days after the Independent Expert is selected. The Independent Expert shall conduct such
investigation as he deems reasonably necessary or appropriate and make a determination with respect
to such Dispute within twenty (20) days of receipt of such position statements.

          (d) The fees and expenses of the Independent Expert shall be borne equally by Noble and
Purchaser, but the decision of the Independent Expert may include such award of the Independent
Expert’s fees and expenses and of other costs and attorneys’ fees as the Independent Expert
determines appropriate (provided that such award of costs and fees may not exceed the amount of
such costs and fees incurred by the losing Party in the arbitration).

          (e) The decision and award of the Independent Expert shall be binding upon the Parties and
final and nonappealable to the maximum extent permitted by Applicable Law, and judgment thereon may
be entered in a court of competent jurisdiction and enforced by any Party as a final judgment of
such court.

     17.2 Governing Law. This Agreement and all instruments executed in accordance with it
shall be governed by and interpreted in accordance with the laws of the State of Texas, excluding
any conflicts of law rule or principle that might refer construction of such provisions to the laws
of another jurisdiction.

     17.3 Entire Agreement. This Agreement, including all exhibits attached hereto and
made a part hereof, together with the Confidentiality Agreement, the Defects Escrow Agreement and
the Deposit Escrow Agreement, constitute the entire agreement between the Parties with respect to
the subject matter hereof and thereof and supersede all prior agreements,

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understandings, negotiations and discussions, whether oral or written, of the Parties with
respect to same. No supplement, amendment, alteration, modification, waiver or termination of this
Agreement shall be binding unless executed in writing by the Parties.

     17.4 Waiver. No waiver of any of the provisions of this Agreement shall be deemed or
shall constitute a waiver of any other provisions hereof (whether or not similar), nor shall such
waiver constitute a continuing waiver unless otherwise expressly provided.

     17.5 Captions. The captions in this Agreement are for convenience only and shall not
be considered a part of or affect the construction or interpretation of any provision of this
Agreement.

     17.6 Assignment.

          (a) Noble hereby consents to an assignment or other transfer by Purchaser of its rights under
this Agreement or any of the Assets, it being understood, however, that any such transfer by
Purchaser shall not relieve Purchaser of any accrued and/or future liabilities or obligations
hereunder or arising out of or incident to this Agreement and the transactions contemplated hereby
unless Noble has discharged Purchaser expressly and in writing, and Purchaser shall be and shall
remain jointly and severally (or solidarily if Louisiana law is determined to apply) liable with
its transferee for the full and faithful performance of all accrued and/or future obligations and
satisfaction of all accrued and/or future liabilities under this Agreement and/or arising out of or
incident to the transactions contemplated hereby.

          (b) Except as otherwise provided herein, this Agreement shall be binding upon and inure to the
benefit of the Parties and their respective successors and permitted assigns.

     17.7 Notices. Any notice provided or permitted to be given under this Agreement shall
be in writing, and may be served by personal delivery, facsimile or by depositing same in the mail,
addressed to the Party to be notified, postage prepaid, and registered or certified with a return
receipt requested. Notice deposited in the mail in the manner hereinabove described shall be deemed
to have been given and received on the date of the delivery as shown on the return receipt. Notice
served in any other manner shall be deemed to have been given and received only if and when
actually received by the addressee (except that notice given by facsimile shall be deemed given and
received upon receipt only if received during normal business hours and if received other than
during normal business hours shall be deemed received as of the opening of business on the next
Business Day). For purposes of notice, the addresses of the parties shall be as follows:

For Noble:

Noble Energy, Inc.

100 Glenborough, Suite 100

Houston, Texas 77067

Attn: Shawn E. Conner

Telecopy No.: 281/872-3358

Telephone No.: 281/872-3138

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With a copy to:

Noble Energy, Inc.

100 Glenborough, Suite 100

Houston, Texas 77067

Attn: Aaron G. Carlson

Telecopy No.: 281/872-3115

Telephone No.: 281/872-3354

For Purchaser:

Coldren Resources LP

228 St. Charles Ave., Suite 724

New Orleans, LA 70130

Attn: Clint Coldren

Telecopy No.: 504-569-3331

Telephone No.:504-569-3300

With a copy to:

First Reserve Corporation

600 Travis, Suite 6000

Houston, Texas 77002

Attn: Hardy Murchison and Craig Jarchow

Telecopy No.: (713) 224-0771

Telephone No.:(713) 227-7890

First Reserve Corporation

One Lafayette Place

Greenwich, CT 06830

Attn: Thomas R. Denison

Telecopy No.: (203) 625-8520

Telephone No.:(203) 625-2520

and

SPN Resources, L.L.C.

2202 Oil Center Court, Suite 200

Houston, TX 77073-3333

Attn: Greg Miller

Telecopy No.: 281-784-7949

Telephone No.: 281-784-7948

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     Each Party shall have the right, upon giving ten (10) days’ prior notice to the other in the
manner hereinabove provided, to change its address for purposes of notice.

     17.8 Expenses. Except as otherwise provided herein, each Party shall be solely
responsible for all expenses incurred by it in connection with the transactions contemplated
hereunder (including, without limitation, fees and expenses of its own counsel and consultants).
Purchaser shall pay for all documentary, filing and recording fees required in connection with the
filing and recording of the Assignments and Bills of Sale, Assignments of Record Title and
Assignments of Operating Rights delivered by Noble to Purchaser at Closing. Within forty-five (45)
days following Closing, Purchaser shall furnish Noble with a statement setting forth the recording
information for each county or parish wherein such Assignments and Bills of Sale were recorded.

     17.9 Severability. If any term, phrase or other provision of this Agreement is
invalid, illegal or incapable of being enforced under any rule of law or public policy, all other
terms, phrases and provisions of this Agreement shall nevertheless remain in full force and effect
and this Agreement shall be interpreted so as to give effect to the original intent of the Parties
as closely as possible so long as the economic or legal substance of the transactions contemplated
hereby is not affected in a materially adverse manner with respect to either Party.

     17.10 Publicity. Noble and Purchaser shall consult with each other with regard to all
publicity and other releases concerning this Agreement and the transactions contemplated hereby
and, except as required by, or pursuant to, Applicable Law or the applicable rules or regulations
of any Governmental Entity or stock exchange on which shares of such Party or any of its Affiliates
are listed, neither Party shall issue any publicity or other release without the prior written
consent of the other Party.

     17.11 Use of Noble’s Name. As soon as practicable after the Closing, Purchaser shall
remove or cause to be removed the names and marks used by Noble and all variations and derivatives
thereof and logos relating thereto from the Assets and shall not thereafter make any use whatsoever
of those names, marks and logos. In the event Purchaser has not completed such removal within
sixty (60) days after Closing, Noble shall have the right but not the obligation to complete such
removal or cause such removal to be completed at Purchaser’s cost and expense.

     17.12 Consequential Damages. The Parties waive any rights to incidental or
consequential damages resulting from a breach of this Agreement, including, without limitation,
loss of profits.

     17.13 No Third-Party Beneficiary. Except as expressly provided herein, this Agreement
is not intended to create, nor shall it be construed to create, any rights in any third party under
doctrines concerning third-party beneficiaries.

     17.14 Survival; Limitation of Liability.

          (a) Except as otherwise set forth in this Agreement, the representations and warranties
contained in this Agreement (other than those in Section 4.6 and Section 4.10), and

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the covenants and obligations of the Parties under this Agreement to be performed prior to the
Closing, shall survive the Closing for a period of three hundred sixty-five (365) days. Except as
otherwise set forth in this Agreement, (i) the representations and warranties contained in Section
4.10 shall survive the Closing for a period of sixty (60) days, (ii) the representations and
warranties contained in Section 4.6 and the other covenants and obligations of the Parties under
this Agreement shall survive the Closing without any time limitation, and any claim with respect to
the breach thereof may be made at any time and (iii) the representation and warranty contained in
Section 4.7(d) shall terminate as of Closing. Representations, warranties, covenants and
obligations hereunder shall be of no further force or effect after the date of their expiration;
provided, however, that there shall be no termination of any bona fide claim asserted pursuant to
this Agreement with respect to such a representation, warranty, covenant or obligation prior to its
expiration date. The indemnity obligations set forth in Sections 11.4(b)(ii) and 11.4(c)(i) shall
terminate as of the date of each respective representation, warranty, covenant or obligation that
is subject to indemnification, except in each case as to matters for which a specific written claim
for indemnity has been delivered to the Indemnifying Party on or before such termination date.

          (b) In no event shall Noble’s aggregate liability under this Agreement, including liability
for (i) title defects pursuant to its limited “by, through or under” warranty, (ii) general
indemnities under Article 11 and (iii) environmental indemnities pursuant to Section 16.2 exceed,
in the aggregate, twenty-five percent (25%) of the Purchase Price; provided that (x) the covenants
of the parties under Sections 2.3, 2.5, 11.1 and 11.3 shall not be limited by this Section
17.14(b), and (y) Noble’s indemnities under Sections 11.4(c)(ii) and (iv) shall not be limited by
this Section 17.14(b).

     17.15 Counterparts and Exhibits. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which together shall constitute
one and the same instrument. All exhibits attached hereto are hereby made a part of this Agreement
and incorporated herein by this reference.

     17.16 Operatorship Matters.

          (a) Notwithstanding anything herein to the contrary, Noble does not represent to Purchaser
that Purchaser will succeed to Noble’s operatorship of any unit or well constituting a part of the
Assets. Purchaser acknowledges and agrees that Purchaser will be required to comply with the terms
of any applicable operating agreement, unit operating agreement or other contract relating to any
elections or other selection procedures in order to succeed Noble as operator thereunder.

          (b) Concerning Noble-operated Assets, Purchaser shall provide Noble with evidence of the
acceptance by the applicable government authority of any such change of operatorship prior to the
time Noble transfers operations to Purchaser. Where practicable, transfer of operations under this
paragraph shall be performed on the first day of the month immediately following the date of
receipt of approval of the applicable government authority for successor operations by Purchaser,
subject to the terms and provisions of the Transition Agreement referenced in Section 11.6 where
applicable.

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     17.17 Conflict With Assignment. Noble and Purchaser acknowledge and agree that in the
event of any conflict or inconsistency between the terms and provisions of this Agreement and the
terms and provisions of the assignments executed and delivered at Closing by Noble and Purchaser,
the terms and provisions of this Agreement shall control.

     17.18 DTPA Waiver. TO THE EXTENT APPLICABLE TO THE ASSETS OR ANY PORTION THEREOF,
PURCHASER HEREBY WAIVES THE PROVISIONS OF THE TEXAS DECEPTIVE TRADE PRACTICES ACT, CHAPTER 17,
SUBCHAPTER E, SECTIONS 17.41 THROUGH 17.63, INCLUSIVE (OTHER THAN SECTION 17.555, WHICH IS NOT
WAIVED), TEX. BUS. & COM. CODE. IN ORDER TO EVIDENCE ITS ABILITY TO GRANT SUCH WAIVER, PURCHASER
HEREBY REPRESENTS AND WARRANTS TO NOBLE THAT PURCHASER (A) IS IN THE BUSINESS OF SEEKING OR
ACQUIRING, BY PURCHASE OR LEASE, GOODS OR SERVICES FOR COMMERCIAL OR BUSINESS USE, (B) HAS ASSETS
OF $5,000,000 OR MORE ACCORDING TO ITS MOST RECENT FINANCIAL STATEMENT PREPARED IN ACCORDANCE WITH
GAAP, (C) HAS KNOWLEDGE AND EXPERIENCE IN FINANCIAL AND BUSINESS MATTERS THAT ENABLE IT TO EVALUATE
THE MERITS AND RISKS OF THE TRANSACTION CONTEMPLATED HEREBY, AND (D) IS NOT IN A SIGNIFICANTLY
DISPARATE BARGAINING POSITION.

     17.19 Redhibition Waiver. PURCHASER: (A) WAIVES ALL RIGHTS IN REDHIBITION PURSUANT TO
LOUISIANA CIVIL CODE ARTICLE 2475 AND ARTICLES 2520 THROUGH 2548; (B) ACKNOWLEDGES THAT THIS
EXPRESS WAIVER SHALL BE CONSIDERED A MATERIAL AND INTEGRAL PART OF THIS SALE AND THE CONSIDERATION
THEREOF; AND (C) ACKNOWLEDGES THAT THIS WAIVER HAS BEEN BROUGHT TO THE ATTENTION OF PURCHASER, HAS
BEEN EXPLAINED IN DETAIL AND THAT PURCHASER HAS VOLUNTARILY AND KNOWINGLY CONSENTED TO THIS WAIVER
OF WARRANTY OF FITNESS AND WARRANTY AGAINST REDHIBITORY VICES AND DEFECTS FOR THE ASSETS.

     17.20 UTPCPL Waiver. TO THE EXTENT APPLICABLE TO THE PROPERTIES OR ANY PORTION
THEREOF, PURCHASER HEREBY WAIVES THE PROVISIONS OF THE LOUISIANA UNFAIR TRADE PRACTICES AND
CONSUMER PROTECTION LAW (LA. R.S. 51:1402, ET SEQ.). PURCHASER WARRANTS AND REPRESENTS THAT IT: (A)
IS EXPERIENCED AND KNOWLEDGEABLE WITH RESPECT TO THE OIL AND GAS INDUSTRY GENERALLY AND WITH
TRANSACTIONS OF THIS TYPE SPECIFICALLY; (B) POSSESSES AMPLE KNOWLEDGE, EXPERIENCE AND EXPERTISE TO
EVALUATE INDEPENDENTLY THE MERITS AND RISKS OF THE TRANSACTIONS HEREIN CONTEMPLATED; AND (C) IS NOT
IN A SIGNIFICANTLY DISPARATE BARGAINING POSITION.

     17.21 Recordation. The Assignment and Bill of Sale form attached as Schedule
10.2(a)(1) for Leasehold Interests located in or adjacent to the State of Texas and,
Schedule 10.2(a)(2) for Leasehold Interests located in or adjacent to the State of
Louisiana, Schedule 10.2(a)(3) for Leasehold Interests located in or adjacent to the State
of Mississippi and Schedule 10.2(a)(4) for Leasehold Interests located in or adjacent to
the State of Alabama are intended to

48

 

convey all of the Assets being conveyed pursuant to this Agreement. Certain Assets or specific
portions of the Assets that are leased from, or require the approval to transfer by, a Governmental
Entity are conveyed under the Assignment and Bill of Sale and also are described and covered by
Assignments of Record Title Interest and Assignments of Operating Rights, and other separate
assignments made by Noble to Purchaser on officially approved forms, or forms acceptable to such
entity, in sufficient multiple originals to satisfy applicable statutory and regulatory
requirements. The interests conveyed by such separate assignments are the same, and not in
addition to, the interests conveyed in any of such Assignments and Bill of Sale. Further, such
assignments shall be deemed to contain the special limited title warranty of Noble and all of the
exceptions, reservations, rights, titles, power and privileges set forth herein as fully and only
to the extent as though they were set forth in each such separate assignment. Should the law of a
state other than Texas or Louisiana be deemed applicable under the OCSLA, then any provisions of
Applicable Law of such state parallel to those referenced in Sections 17.18, 17.19 and 17.20 above
shall also be deemed waived to the maximum extent allowed by Applicable Law.

     17.22 MMS Approval. Purchaser promptly after the Closing Date shall actively pursue
MMS unconditional approval of the assignments of the Assets situated on the Outer Continental
Shelf, and ownership thereof, from Noble to Purchaser. Purchaser obligates itself to take any and
all reasonable action required by the MMS in order to obtain such approval and shall provide Noble
with evidence that the MMS has determined that Purchaser (a) is exempt from any supplemental
bonding requirements or (b) has satisfied any supplemental bonding requirements in accordance with
Section 8.5(b), in either case involving the Assets. Until such time as Purchaser has provided
Noble with such evidence satisfactory to Noble of compliance with this Section 17.22, Noble shall
have the right to refuse to transfer operations of the Assets and Noble will continue to operate
the Assets pursuant to the terms of the Transition Agreement.

     17.23 Additional Documents and Actions. The Parties agree to execute such additional
documents or take such additional actions as may be required to give effect to the intent of the
Parties.

     17.24 Cooperation in Connection with Regulatory Filings. For a period of three years
following the Closing, Noble shall, and shall cause its Affiliates and their respective officers,
employees, advisors and auditors to, provide reasonable cooperation to Purchaser, and its
Affiliates and their respective accounting firms and representatives (collectively, the “Purchaser
Party”) in connection with the preparation of financial statements and other documents to meet the
disclosure and filing requirements under the Securities Act of 1933 as amended, or the Securities
Exchange Act of 1934, as amended, associated with the registration of any securities or debt of
Purchaser or any of its Affiliates (collectively, the “Filings”). Further, for a period of three
years following the Closing, Noble agrees to retain and make available, subject to Noble’s
presently existing records retention policy, to Purchaser Party any and all books, records,
information and documents that are attributable to the Assets in Noble’s possession reasonably
required by a Purchaser Party in order to prepare any Filings and documents associated therewith.
Purchaser will reimburse Noble, within five (5) Business Days after demand in writing therefor, for
any reasonable out-of-pocket costs incurred by Noble and its Affiliates and their respective
representatives in complying with the provisions of this Section 17.24.

49

 

ARTICLE 18

DEFINITIONS AND REFERENCES

     18.1 Certain Defined Terms. When used in this Agreement, the following terms shall
have the respective meanings assigned to them in this Section 18.1 or in the section, subsections
or other subdivisions referred to below:

     “Affiliate” means, with respect to any specified Person, any Person that directly or
indirectly controls, is controlled by or is under common control with such specified Person. For
the purpose of the immediately preceding sentence, the term “control” means the power to direct or
cause the direction of the management of such Person, whether through the ownership of voting
securities or by contract or agency or otherwise.

     “Agreed Rate” means, at the time of any determination thereof is to be made, the fluctuating
per annum rate of interest then most recently reported in the Wall Street Journal as the “Prime
Rate” (the base rate on corporate loans at large U.S. money center commerce banks).

     “Applicable Law” means any statute, law, principle of common law, rule, regulation, judgment,
order, ordinance, requirement, code, writ, injunction, or decree of any Governmental Entity.

     “Casualty” means any casualty event, including any fire, explosion, lightening, flood,
hurricane or other casualty.

     “Confidentiality Agreement” means that certain agreement dated February 21, 2006, by and
between Noble and First Reserve Corporation.

     “Customary Post-Closing Consents” means consents required to be obtained in connection with
assignment of any Asset in connection with the transactions contemplated hereby of a nature that
would customarily be obtained after the Closing in transactions similar to the transactions
contemplated hereby (including any consent or approval of or filing with any Governmental Entity in
connection with the assignment of any Asset), but excluding the consents listed on Schedule
4.11.

     “Damages” means all claims, actions, causes of action, demands, assessments, losses, damages,
liabilities, judgments, settlements, penalties, costs, and expenses (including reasonable
attorney’s fees and expenses) of any nature whatsoever.

     “Environmental Laws” means any and all federal, state and local laws, statutes, regulations,
rules, orders, ordinances, permits or determinations of any governmental authority pertaining to
health, the environment, wildlife or natural resources in effect in any and all jurisdictions in
which the Assets are located, including, without limitation, the Clean Air Act, as amended, and the
Federal Water Pollution Control Act, as amended, the Rivers and Harbors Act of 1899, as amended,
the Safe Drinking Water Act, as amended, the Comprehensive Environmental Response, Compensation and
Liability Act (“CERCLA”), as amended, the Superfund Amendments and Reauthorization Act of 1986, as
amended, the Resource Conservation and Recovery Act (“RCRA”), as amended, The Hazardous and Solid
Waste

50

 

Amendments Act of 1984, as amended, the Toxic Substances Control Act, as amended, the
Occupational Safety and Health Act, as amended, and the Hazardous Materials Transportation Act, as
amended. The terms “hazardous substance,” “release” and “threatened release” shall have the
meanings specified in CERCLA, and the terms “solid waste,” “hazardous waste,” and “disposal” (or
“disposed”) shall have the meanings specified in RCRA; provided, however, that (a) to the extent
the laws of the state in which the Assets are located, or adjacent, are applicable and have
established a meaning for “hazardous substance,” “release,” “threatened release,” “solid waste,”
“hazardous waste,” and “disposal” that is broader than that specified in CERCLA or RCRA, such
broader meaning shall apply with respect to the matters covered by such laws, and (b) the term
“solid waste” shall include all oil and gas exploration, development, and production wastes, even
if such wastes are specifically exempt from classification as hazardous substances or hazardous
wastes pursuant to CERCLA or RCRA, or the state analogues to those statutes.

     “Environmental Liabilities” means any and all Damages (including any remedial, removal,
response, abatement, clean-up, investigation and/or monitoring costs and associated legal costs)
incurred or imposed (a) pursuant to any agreement, order, notice of responsibility, directive
(including directives embodied in Environmental Laws), injunctions, judgment or similar documents
(including settlements) arising out of, in connection with, or under Environmental Laws, or (b)
pursuant to any claim by a Governmental Entity or any other Person for personal injury, property
damage, damage to natural resources, remediation, or payment or reimbursement of response costs
incurred or expended by such Governmental Entity or other Person pursuant to common law or statute
and related to the use or release of hazardous substances.

     “GAAP” means generally accepted accounting principles in the United States of America from
time to time, applied on a consistent basis throughout the periods involved.

     “Governmental Entity” means any court or tribunal in any jurisdiction (domestic or foreign) or
any federal, state, county, municipal, or other governmental or quasi-governmental body, agency,
authority, department, commission, board, bureau, or instrumentality (domestic or foreign).

     “HSR Act” means the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.

     “Hydrocarbons” means oil and gas and other hydrocarbons produced or processed in association
therewith.

     “Imbalance” means all gas imbalances and make-up obligations related to the Assets regardless
of whether such imbalances or make-up obligations arise at the wellhead, pipeline, gathering system
or other level, and regardless of whether the same arise under contract or otherwise.

     “Knowledge” of a specified Person (or similar references to a Person’s knowledge) means all
information actually or constructively known to (a) in the case of a Person who is an

51

 

individual, such Person, (b) in the case of a Person which is corporation or other entity, an
executive officer or employee who devoted substantive attention to matters of such nature during
the ordinary course of his employment by such Person, or (c) in the case of Noble, of the
following: Bob Bemis, Director of Environmental, Health and Safety; Mike Brown, Business
Development Advisor, North America; Aaron Carlson, Senior Attorney; Shawn Conner, Director of
Business Development; Roger Souders, Senior Landman; Joe Zimmerman, Shelf Operations Manager; Ted
Price, Vice President, Exploration/Exploitation; Pam Tuilos, Regulatory/Environmental Coordinator,
GOM/South; Shelly Goddard, Lease Records Supervisor; Janice Spruill, Division Order Supervisor;
Rodney Cook, Vice President, Southern Region; Bill Sharp, Asset Manager, Gulf Coast Shelf; Stan
Doiron, Offshore Production Supervisor; and Jack Harmoth, Tax Director. A Person has “constructive
knowledge” of those matters which the individual involved could reasonably be expected to have as a
result of undertaking an investigation of such a scope and extent as a reasonably prudent man would
undertake concerning the particular subject matter.

     “Lien” means any claim, lien, mortgage, security interest, pledge, charge, option,
right-of-way, easement, encroachment, or encumbrance of any kind.

     “Material Adverse Effect” means a material adverse effect on the value of the Assets (taken as
a whole and after taking into account any insurance, indemnity and other recoveries payable in
respect thereof), excluding any effect resulting from or arising in connection with (a) this
Agreement or the transactions contemplated hereby or the public announcement thereof; (b) the
effect of any change in the United States or foreign economies or securities or financial markets
in general; (c) the effect of any change that affect generally the oil and gas industry, such as
fluctuations in the price of oil and gas; (d) the effect of any change arising in connection with
any natural disasters, hostilities, acts of war, sabotage or terrorism or military actions or any
escalation or material worsening of any such hostilities, acts of war, sabotage or terrorism or
military actions existing or underway as of the date hereof; (e) the effect of any action taken by
Purchaser or its Affiliates (other than providing consent or approval pursuant to Section 6.1) with
respect to the transactions contemplated hereby or with respect to the Assets, (f) any matter
expressly set forth in an exhibit or schedule hereto; or (g) any change in Applicable Law or
accounting rules.

     “Net Revenue Interest” or “NRI” means an interest (expressed as a percentage or decimal
fraction) in and to the Hydrocarbons produced and saved from or attributable to an Asset.

     “Person” shall mean any individual, firm, corporation, partnership, limited liability company,
joint venture, association, trust, unincorporated organization, Governmental Entity or any other
entity.

     “Working Interest” or “WI” means the percentage of costs and expenses attributable to the
maintenance, development and operation of an Asset.

     18.2 Certain Additional Defined Terms. In addition to such terms as are defined in
the preamble of and the recitals to this Agreement and in Section 18.1, the following terms are
used in this Agreement as defined in the Articles or Sections set forth opposite such terms:

52

 

	 	 	 
	Term	 	Defined
	Adjusted Purchase Price

	 	Section 2.2
	Adjustment Amount

	 	Section 3.5
	AFE

	 	Section 4.13
	Agreement

	 	Preamble
	Allocated Value

	 	Section 3.1(c)(i)
	Assets

	 	Section 1.1
	Assumed Obligations

	 	Section 11.4(a)
	Business Days

	 	Section 2.3(a)
	Business Employees

	 	Section 11.12(a)
	Claim Notice

	 	Section 11.4(e)(i)
	Closing

	 	Section 10.1
	Closing Date

	 	Section 10.1
	Code

	 	Section 4.5
	Continuing Employee

	 	Section 11.12(c)
	Cure Period

	 	Section 3.6(b)
	Deductible Amount

	 	Section 3.4
	Defects Escrow

	 	Section 3.6(a)
	Defects Escrow Agent

	 	Section 3.6(a)
	Defects Escrow Agreement

	 	Section 3.6(a)
	Defects Escrow Amount

	 	Section 3.6(a)
	Defensible Title

	 	Section 3.1(d)(i)
	Deferred Adjustment Claim

	 	Section 3.5
	Deferred Matters Date

	 	Section 3.5
	Deposit

	 	Section 2.1(c)
	Deposit Escrow Agreement

	 	Section 2.1(e)
	Disputes

	 	Section 17.1(a)
	Documents

	 	Section 14.1
	Effective Time

	 	Section 1.1
	Entech

	 	Section 1.2
	Environmental Claims

	 	Section 16.2
	Environmental Defect

	 	Section 3.2(e)(i)
	Environmental Defect Notice

	 	Section 3.2(c)
	Environmental Defect Value

	 	Section 3.2(e)(ii)
	Environmental Information

	 	Section 3.2(b)
	Escrow Agent

	 	Section 2.1(c)
	Examination Period

	 	Section 3.1(a)
	Estimated Adjusted Purchase Price

	 	Section 2.3(a)
	Excluded Assets

	 	Section 1.1
	Filings

	 	Section 17.24
	Indemnified Party

	 	Section 11.4(e)(i)
	Indemnifying Party

	 	Section 11.4(e)(i)
	Independent Expert

	 	Section 17.1(a)
	Interim Period

	 	Section 6.1

53

 

	 	 	 
	Term	 	Defined
	Leasehold Interests

	 	Section 1.1(a)
	Leases

	 	Section 4.17
	Losses

	 	Section 7.4
	Material Contracts

	 	Section 4.7
	MMS

	 	Section 5.7
	Noble

	 	Heading
	Noble Indemnified Parties

	 	Section 7.4
	Noble Internal ORRIs

	 	Section 11.4(f)
	Orders and Contracts

	 	Section 1.1(b)(iii)
	Overheld Amount

	 	Section 3.5
	Party and Parties

	 	Preamble
	Permitted Encumbrances

	 	Section 3.1(d)(ii)
	Platforms

	 	Section 1.1(b)(i)
	Post-Closing Defect

	 	Section 3.6(a)
	Pref Right Notice

	 	Section 3.9(a)
	Property Taxes

	 	Section 13.1
	Purchase Price

	 	Section 2.1(a)
	Purchaser

	 	Heading
	Purchaser Indemnified Parties

	 	Section 11.4(c)
	Purchaser Party

	 	Section 17.24
	Purchaser’s Environmental Consultant

	 	Section 3.2(a)
	Purchaser’s Environmental Review

	 	Section 3.2(a)
	Purchaser’s Estimate

	 	Section 3.5
	Purchaser’s Title Review

	 	Section 3.1(a)
	Records

	 	Section 1.1(c)
	Resolved Amount

	 	Section 3.5
	Rules

	 	Section 17.1(b)(i)
	Title Defect

	 	Section 3.1(d)(iii)
	Title Defect Amount

	 	Section 3.1(c)
	Title Defect Asset

	 	Section 3.1(b)
	Title Defect Notice

	 	Section 3.1(b)
	Third Party

	 	Section 11.4(a)(i)
	Third Party Claim

	 	Section 11.4(e)(i)
	Wells

	 	Section 1.1(b)(i)

[signature page to follow]

54

 

     EXECUTED on May 15, 2006, to be effective for all purposes, however, as of the Effective Date.

	 	 	 	 	 	 	 
	 	 	NOBLE ENERGY, INC.	 	 
	 
	 	 	 	 	 	 
	 

	 	By: 	 	/s/ David L. Stover	 	 
	 

	 	 	 	 	 
	 	 	Name: David L. Stover	 	 
	 	 	Title: Senior Vice President	 	 

	 	 	 	 	 	 	 	 	 
	 	 	COLDREN RESOURCES LP	 	 
	 
	 	 	 	 	 	 	 	 
	 	 	By	 	Coldren Resources GP LLC,	 	 
	 	 	 	 	Its General Partner	 	 
	 
	 	 	 	 	 	 	 	 
	 

	 	 	 	By:	 	/s/ Clinton W. Coldren	 	 
	 

	 	 	 	 	 	 	 
	 

	 	 	 	Name:	 	Clinton W. Coldren	 	 
	 

	 	 	 	 	 	 	 
	 

	 	 	 	Title:	 	Authorized Person	 	 
	 

	 	 	 	 	 	 	 

Schedules and Exhibits have been intentionally omitted, and will be made available to the
Securities and Exchange Commission upon request.

55

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