China has reportedly tapped a massive volcanic reservoir that could help power millions of homes across the capital region.
China National Offshore Oil Corporation (CNOOC) announced the discovery of a “prolific volcanic oil and gas well” in deep formations of the central Bohai Sea. According to reports, the reservoir in this region is 5,770 meters (18,930 feet) deep. The find lies next to the Bozhong Sag, the largest hydrocarbon-rich depression in the Bohai Sea.
The discovery could support China’s push to extract natural gas from extreme offshore environments.
Volcanic gas spring in the Bohai Sea
During testing, the well produced approximately 800,000 cubic meters of natural gas per day from a cumulative gas production zone more than 120 meters thick in volcanic rocks. For the Beijing-Tianjin-Hebei region and the broader Bohai Rim, this area serves as a vital energy lifeline.
“The success of this well has opened up new potential for ultra-deep offshore natural gas exploration and expanded the scope of deep oil and gas exploration in Bohai,” said Xu Changgui, chief scientist and chief geologist of CNOOC, as Reuters reported.
However, drilling at such depths presents many challenges. Extreme heat flow, intense tectonic activity, and complex rock structures make underground reservoir prediction difficult.
To overcome these obstacles, CNOOC independently developed broadband, multi-source three-dimensional seismic technologies as well as new methods for identifying high-quality reservoirs in extremely deeply buried hills.
Gas-bearing production zones in volcanic formations are underground layers of cooled magma and ash that contain commercially recoverable natural gas. In sedimentary reservoirs, gas rests between grains of sand, while in volcanic rock traps it is trapped in tiny bubbles and tectonic fractures formed by eruptions.
Over millions of years, natural gas migrates up from deeper source rocks into these porous pockets, where a dense overlying layer of rock seals it in place.
Beijing’s energy security goals
The development comes at a time when Beijing is doubling down on its domestic energy security. A five-year development plan by the National Development and Reform Commission and the National Energy Administration calls for more intensive exploration to consolidate independent supply. The target is reportedly 440 million tonnes of domestic oil and gas equivalent by 2030.
Offshore production already accounts for much of this dynamic. Data from the Ministry of Natural Resources shows China’s offshore crude oil production rose 3.5 percent year-on-year in the first nine months of 2026.
Washington has long placed CNOOC on trade blacklists, including the Commerce Department’s Entity List and the Pentagon’s Section 1260H list, denying it access to advanced American oilfield services, specialized software and deep-sea drilling hardware.
Reaching a depth of nearly 6,000 meters without relying on Western oilfield giants such as SLB, Baker Hughes or Halliburton shows that Beijing’s push for technological self-reliance in energy infrastructure is paying off.
US energy companies such as Chevron, Shell and ExxonMobil routinely drill ultra-deep wells in the Gulf of Mexico. CNOOC’s project is notable for targeting volcanic rocks in an active tectonic zone, while drilling on the US Gulf Coast is primarily focused on sedimentary sandstone reservoirs.
