CNOOC Makes Ultra-Deep Gas Discovery in China's Bohai Sea

China's CNOOC has discovered a high-yield oil and gas well in ultra-deep volcanic formations in the Bohai Sea, with testing showing natural gas flow of approximately 800,000 cubic meters (28 million cubic feet) per day.

The well, located in central Bohai near the Bozhong Sag, encountered more than 120 metres of cumulative gas pay in volcanic formations and was completed at a depth of 5,770 metres, according to CNOOC.

The discovery marks a significant breakthrough in offshore ultra-deep natural gas exploration, opening a new geological play in an area where complex subsurface conditions have made reservoir prediction difficult, according to the company.

CNOOC said it used independently developed multi-source broadband three-dimensional (3D) seismic exploration technologies and new reservoir prediction methods to identify favorable gas-bearing zones in the ultra-deep volcanic formations.

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