ATP Provides Update on Offshore Israel Deepwater Licenses

HOUSTON--()--ATP Oil & Gas Corporation (NASDAQ: ATPG) and its wholly-owned subsidiary ATP East Med B.V. (“ATP East Med”) have acquired the Shimshon, Daniel East and Daniel West licenses in offshore Israel and the Israeli government has approved these licenses. Based on the acquired licenses, ATP through ATP East Med anticipates spending between $3 and $5 million in 2011 in offshore Israel for acquisition costs, seismic and preliminary exploration plans.

ATP East Med, as operator of the licenses, has assumed the drilling contract with Transocean Drilling Israel Ltd. for the Sedco Express drilling unit at the Shimshon location where it anticipates initial drilling during the second quarter 2012. ATP expects to spend between $24 and $29 million during 2012 related to the initial exploratory well on the Shimshon license for its 40% working interest.

ATP notes that Isramco Negev, its partner in Shimshon, on March 6, 2011 reported that it received an independent reservoir engineering evaluation from Lockwood & Associates estimating gross potential natural gas reserves at Shimshon. According to Isramco Negev, “Lockwood & Associates considers the calculated assessment of the total geological and geophysical exploration probability of success of 20 percent to be reasonable. Lockwood said its high estimate was for 3.4 TCF, the low estimate was 1.5 TCF and its best estimate was 2.3 TCF.”

Additional information on the Daniel East and Daniel West licenses will be provided as drilling and exploration plans are approved. ATP East Med is also party to two other licenses in offshore Israel which are awaiting approval by the Israeli Ministry of National Infrastructures.

About ATP Oil & Gas Corporation

ATP Oil & Gas Corporation (ATP) is engaged in the development and production of oil and natural gas in the offshore Gulf of Mexico, Mediterranean Sea and the North Sea. ATP established itself as a deepwater operator in the Gulf of Mexico Garden Banks area with the subsea Ladybug wells in 2000. With its proven abilities in the utilization of subsea technologies, ATP is aggressively expanding its development activities internationally into the historically productive region of the North Sea and into the Mediterranean Sea. The company trades publicly as ATPG on the NASDAQ Global Select Market. For more information about ATP Oil & Gas Corporation, visit www.atpog.com.

Forward-looking Statements

Certain statements included in this news release are “forward-looking statements” under the Private Securities Litigation Reform Act of 1995. ATP cautions that assumptions, expectations, projections, intentions, or beliefs about future events may, and often do, vary from actual results and the differences can be material. Some of the key factors which could cause actual results to vary from those ATP expects include changes in natural gas and oil prices, the timing of planned capital expenditures, availability of acquisitions, uncertainties in estimating proved reserves and forecasting production results, operational factors affecting the commencement or maintenance of producing wells, the condition of the capital markets generally, as well as the company’s ability to access them, and uncertainties regarding environmental regulations or litigation and other legal or regulatory developments affecting ATP’s business. More information about the risks and uncertainties relating to ATP's forward-looking statements is found in the company’s SEC filings.

Contacts

ATP Oil & Gas Corporation, Houston
T. Paul Bulmahn, 713-622-3311
Chairman and CEO
or
Albert L. Reese Jr., 713-622-3311
Chief Financial Officer
www.atpog.com

Release Summary

ATP Provides Update on Offshore Israel Deepwater Licenses

Contacts

ATP Oil & Gas Corporation, Houston
T. Paul Bulmahn, 713-622-3311
Chairman and CEO
or
Albert L. Reese Jr., 713-622-3311
Chief Financial Officer
www.atpog.com