CNOOC Ltd. announced March 18 it made a major oilfield discovery in the Bohai Sea, adding over 100 million tons of oil equivalent proved in-place volume.

The discovery was made in the Qinhuangdao 27-3 oilfield in the north central waters of the Bohai Sea, offshore China, which has an average water depth of approximately 25 m, CNOOC said in its press release.

The field has been tested to produce approximately 742 bbl/d of oil from a single well.

The main oil-bearing play is the Minghuazhen formation of Neogene and the oil property is medium-heavy crude. The discovery well QHD27-3-3 was drilled and completed at a depth of 1,570 m, which encountered a total of 48.9 m oil pay zones, the company said.

 "Over the years, we have been continuing to make new discoveries in the Bohai Sea, which further expand the resource base for offshore oil production growth,” said CNOOC CEO and President Zhou Xinhuai.