The Safaga-Quseir area of the Eastern Desert is estimated to have reserves equivalent about of in-place shale oil and the Abu Tartour area of the Western Desert is estimated to have about of in-place shale oil. The 1000 to 2000 foot thick and organically rich, total organic content of about 4%, Khatatba Formation in the Western Desert is the source rock for wells there and is a potential source for shale oil and shale gas. Apache Corporation, using substantial assets acquired in 2010 from BP after the Deepwater Horizon disaster, is the major operator in the Western Desert, often in joint ventures with Egyptian General Petroleum Corporation (EGPC) such as Khalda Petroleum Company and Qarun Petroleum Company. In 1996 Apache merged with Phoenix Resources, which had made the Qarun discovery in 1994, and took over operations of the Qarun Concession in Egypt. Apache has developed about 18% of the 10 million acres it controls, in 2012 running a score of rigs; drilling about 200 development and injection wells; and about 50 exploration wells with a success rate of about 55%. Plans for 2013 included an investment of about $1 billion in development and exploration. On 29 August 2013 Apache announced sale of a 1/3 share of its Egyptian assets to Sinopec for $3.1 billion effective 1 January 2014; Apache would continue to be the operator.