The Lingshui 25-1 structure is situated in the northeast of Ledong Sag in Qiongdongnan Basin of South China Sea where the average water depth is about 980m.

Drilled and completed at a depth of about 4,000m, the Lingshui 25-1-1 discovery well identified the oil and gas pay zone with a total thickness of about 73m.

The company tested the well to produce about 35.6 million cubic feet of natural gas and 395 barrels of oil per day.

The Lingshui 25-1 is another mid-to-large sized natural gas discovery following Lingshui 17-2, which was identified on independent deepwater exploration.

CNOOC is the producer of offshore crude oil and natural gas in China and is mainly engaged in exploration, development, production and sale of oil and natural gas.