Mariner Energy Proposes Private Offering of Senior Notes

Mariner Energy, Inc. (NYSE: ME) intends to offer to eligible purchasers $250 million aggregate principal amount of senior notes due 2013 pursuant to Rule 144A under the Securities Act of 1933, as amended. The private offering, which is subject to market and other conditions, will be made within the United States only to qualified institutional buyers and outside the United States only to non-U.S. investors under Regulation S of the Securities Act of 1933. Mariner intends to use the net proceeds from the offering to repay debt under its secured bank credit facility.

This announcement is neither an offer to sell nor a solicitation of an offer to buy any securities of Mariner and shall not constitute an offer, solicitation or sale in any jurisdiction in which such offer, solicitation or sale would be unlawful. The notes have not been registered under the Securities Act of 1933 or any state securities laws, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws. Any offers of the notes will be made exclusively by means of a private offering memorandum.