Press Release

Chaparral Energy

Chaparral Energy Schedules Second Quarter 2008 Earnings Conference Call

(Oklahoma City) August 11, 2008 – Chaparral Energy, Inc. announced today it will hold a conference call on Thursday, August 14, at 1:00 p.m. CDT to discuss its second quarter 2008 financial and operating results. Prior to the call the Company will release its 10-Q for the period ending June 30, 2008.

Interested parties may participate in the call by dialing (303) 262-2143 and asking for the Chaparral Energy conference call 10 minutes prior to the start time. The conference call will also be accessible via live webcast in the investor relations section of the Company’s website,

Chaparral Energy, Inc. announced on July 15, 2008, that the Company and Edge Petroleum Corporation (NASDAQ: EPEX and EPEXP) have entered into a definitive merger agreement that provides for Chaparral to acquire Edge in an all-stock transaction. Through the merger, Chaparral will become a publicly traded company. For more information on the announced merger, please reference the joint press release of Chaparral and Edge issued July 15, 2008.

About Chaparral Energy

Chaparral Energy, Inc. is an independent oil and natural gas production and exploitation company, headquartered in Oklahoma City. Since its inception in 1988, the Company has increased reserves and production primarily by acquiring and enhancing properties in its core areas of the Mid-Continent and the Permian Basin. Beginning in 2000, Chaparral expanded its geographic focus to include Ark-La-Tex, North Texas, the Gulf Coast and the Rocky Mountains.

Investor and Media Contact: John Kilgallon
Director, Investor Relations
(405) 426-4035