The Lingshui 17-2, approved as a large-scale gas field by Ministry of Land and Resource, was discovered 150 kilometres south of China's southernmost island of Hainan.
State-run China National Offshore Oil Corporation (CNOOC) said Lingshui 17-2's average operational depth is 1,500 metres below the sea surface.
The company's deepwater drilling rig CNOOC 981 discovered Lingshui 17-2, the country's first self-support deepwater gas field, in September 2014, state-run Xinhua news agency reported.
The field, however, could meet only about six to seven months of Chinese gas supply currently, experts say.
Observers say the discovery may raise further tensions in the South China Sea (SCS), one of the world's busiest shipping routes but dominated by overlapping claims by several nations including Malaysia, Vietnam, Taiwan, the Philippines, Brunei and China, which virtually claims all of the sea.
China has also objected to India's ONGC accepting a Vietnamese invite to take-up oil exploration in the SCS.
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