SOURCE: Mariner Energy, Inc.

Mariner Energy, Inc.

February 25, 2010 19:15 ET

Mariner Energy Announces Monthly Production Disclosure Protocol

HOUSTON, TX--(Marketwire - February 25, 2010) - Mariner Energy, Inc. (NYSE: ME) announced today that it will begin posting monthly estimated production data on its website: www.mariner-energy.com under the tab titled "Production." The volumetric production data will be presented by product and the company's operating regions, which as of January 1, 2010 are the Permian Basin, Gulf Coast and Gulf of Mexico Deepwater and Gulf of Mexico Shelf. Mariner plans to post the production data to the website on a monthly basis after the close of the New York Stock Exchange on the last business day of the month following the applicable reporting period. The report for January 2010 will be posted on February 26.

"Mariner's portfolio includes many wells that produce at high rates, which makes forecasting longer term performance more difficult. We believe that more timely access to this production data will provide greater transparency into our operations and help investors better understand our company and its assets," said Jesus Melendrez, Senior Vice President, Chief Commercial Officer and Acting Chief Financial Officer.

About Mariner Energy, Inc.

Mariner Energy is an independent oil and gas exploration, development, and production company headquartered in Houston, Texas, with principal operations in the Permian Basin, Gulf Coast and the Gulf of Mexico. For more information about Mariner, visit the company's website at www.mariner-energy.com.

Important Information Concerning Forward-Looking Statements

This press release includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements, other than statements of historical facts, that address activities that Mariner assumes, plans, expects, believes, projects, estimates or anticipates (and other similar expressions) will, should or may occur in the future are forward-looking statements. Our forward-looking statements generally are accompanied by words such as "may", "will", "estimate", "project", "predict", "believe", "expect", "anticipate", "potential", "plan", "goal", or other words that convey the uncertainty of future events or outcomes. Forward-looking statements provided in this press release are based on Mariner's current belief based on currently available information as to the outcome and timing of future events and assumptions that Mariner believes are reasonable. Mariner does not undertake to update its guidance, estimates or other forward-looking statements as conditions change or as additional information becomes available. Estimated reserves are related to hydrocarbon prices. Hydrocarbon prices used in estimating reserves may vary significantly from actual future prices. Therefore, volumes of reserves actually recovered may differ significantly from such estimates. Mariner cautions that its forward-looking statements are subject to all of the risks and uncertainties normally incident to the exploration for and development, production and sale of oil and natural gas. These risks include, but are not limited to, price volatility or inflation, environmental risks, drilling and other operating risks, regulatory changes, the uncertainty inherent in estimating future oil and gas production or reserves, and other risks described in Mariner's latest Annual Report on Form 10-K and other documents filed by Mariner with the Securities and Exchange Commission (SEC). Any of these factors could cause Mariner's actual results and plans of Mariner to differ materially from those in the forward-looking statements. Investors are urged to read Mariner's latest Annual Report on Form 10-K and other documents filed by Mariner with the SEC.

This press release does not constitute an offer to sell or a solicitation of an offer to buy any securities of Mariner.