China National Offshore Oil Corporation (CNOOC) announced on Thursday that it has discovered a high-yield volcanic rock oil and gas well in an ultra-deep formation exceeding 5,000 meters in the Bohai Sea. Testing showed a daily natural gas production of approximately 800,000 cubic meters (28 million cubic feet) per day, marking a major breakthrough for China in the field of offshore ultra-deep natural gas exploration.

The well, located in the central Bohai Sea, reaches a total depth of 5,770 meters (some 3.6 miles). During the exploration process, the well encountered more than 120 meters of natural gas-bearing layers in volcanic rock formations, fully demonstrating the vast exploration prospects of the offshore ultra-deep volcanic rock sector in the region.