Joint Filing Statement
Exhibit 99.4
We, the undersigned, hereby express our agreement that the attached Schedule 13D is, and any
further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of
us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange
Act of 1934. This agreement may be terminated with respect to the obligations to jointly file
future amendments to such statement on Schedule 13D as to any of the undersigned upon such person
giving written notice thereof to each of the other persons signatory hereto, at the principal
office thereof.
Dated: February 8, 2008
| ENCORE ACQUISITION COMPANY |
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| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx | ||||
| Senior Vice President, Chief Financial Officer and Treasurer | ||||
| ENCORE PARTNERS LP HOLDINGS LLC |
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| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx | ||||
| Vice President, Treasurer and Secretary | ||||
| EAP OPERATING, LLC |
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| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx | ||||
| Senior Vice President, Chief Financial Officer and Treasurer | ||||
| EAP PROPERTIES, INC. |
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| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx | ||||
| Senior Vice President, Chief Financial Officer and Treasurer | ||||
| ENCORE OPERATING, L.P. |
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| By: | EAP Operating, LLC, its general partner | |||
| By: | /s/ Xxxxxx X. Xxxxxx | |||
| Xxxxxx X. Xxxxxx | ||||
| Senior Vice President, Chief Financial Officer and Treasurer | ||||
