Mariner Energy Achieves First Production at Bass Lite Deepwater Gulf of Mexico Project

Mariner Energy, Inc. announces that its Bass Lite deepwater Gulf of Mexico project commenced production on February 15, 2008. The two-well project, located in a water depth of approximately 6750 feet in Atwater Valley Block 426, is connected by a 56-mile subsea tie back to the Devil’s Tower spar. The current gross production rate of approximately 60 million cubic feet of gas equivalent per day is presently limited by the production system designed to achieve early production while further system upgrades of the topside facilities continue.