The Liuhua 11-1 Field is situated in the 29/04 cooperation area, about 220 km away from Hong Kong. Jointly developed by China Offshore Petroleum Nanhai East Company and Amoco Oil Company of the United States, the cooperation area totals 317 square km with the controlled reserves being 233 million tons. As the largest known offshore oil field in China, its construction was completed in March 1996. The output comes to 1.68 million tons annually during the rush period.
The Fanyu 4-2 Oil Field was found in a basin located in the east part of the South China Sea in May 1998. Developed by the American Santa Fei Energy Resources Co. Ltd., it has been tested to have a capacity to produce oil of 1,102 tons per day. It is estimated that the recoverable reserves of the field stand at 20 million tons.