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CNOOC announces: Major breakthrough in Bohai exploration!
▲ Ultra-deep exploratory well in Bohai yields a high-yield natural gas flow in testing
CNOOC announced today that it has discovered a high-yield oil and gas well in volcanic rocks while drilling in ultra-deep formations at more than 5,000 meters in the Bohai Sea, marking a major breakthrough for China in offshore ultra-deep natural gas exploration.
The well is located in the central waters of the Bohai Sea, adjacent to the Bozhong Sag, the largest hydrocarbon-rich sag in the Bohai Sea. It encountered more than 120 meters of natural gas-bearing layers cumulatively in volcanic formations, with a total drilled depth of 5,770 meters. Testing showed a daily natural gas output of about 800,000 cubic meters (about 28 million cubic feet), demonstrating broad exploration prospects for offshore ultra-deep volcanic rock formations and strongly advancing the natural gas exploration process in the Bozhong Sag.
▲ Ultra-deep exploratory well operation site in the Bohai Sea
The ultra-deep geological conditions in the Bohai Sea are complex, and reservoir prediction is difficult. CNOOC has continuously achieved breakthroughs in the theoretical understanding of offshore ultra-deep oil and gas exploration, independently developed key technologies for offshore deep multi-source broadband three-dimensional seismic exploration, innovated methods for predicting high-quality reservoirs in ultra-deep buried hills, precisely identified favorable natural gas enrichment areas in ultra-deep volcanic rocks in the Bozhong Sag, and discovered a high-yield oil and gas well, achieving an important breakthrough in ultra-deep volcanic rock natural gas exploration in the Bohai Sea.
Xu Changgui, Chief Scientist and Chief Geologist of the China National Offshore Oil Corporation (CNOOC), said that in recent years CNOOC has continued to intensify theoretical innovation and key technology research on deep to ultra-deep oil and gas enrichment in high-heat-flow and tectonically active basins, and exploration in China's seas has achieved a major leap from shallow to deep and ultra-deep layers. The successful drilling of this well has opened up a new play fairway for offshore ultra-deep natural gas exploration, expanded the space for deep oil and gas exploration in the Bohai Sea, and is of positive significance for accelerating ultra-deep exploration in the Bohai Sea and building a trillion-cubic-meter gas province in the Bohai Sea.
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