The idea of a platform the height of a forty-story building, sitting in almost complete darkness more than a kilometer below the South China Sea, extracting natural gas from rock formations that no human hand will ever physically touch has an almost cinematic quality. That is the reality of Shenhai Yihao in China, which is now fully operational following years of development, testing, and a highly visible Phase I debut back in 2021.
With proven geological reserves now confirmed at over 150 billion cubic meters, the field has reached its intended production capacity of 4.5 billion cubic meters of natural gas per year. To put things in perspective, that second figure is not a projection. It is rock—confirmed reserves beneath waters that were thought to be too deep and hostile for China to extract from without the use of foreign technology until very recently. It appears that this reliance has ended.
English.gov.cn According to CNOOC, the completion of Phase II represents a significant advancement in the nation’s capacity to independently build deepwater oil and gas projects under challenging circumstances. Even though that wording sounds like a press release, it merits closer examination. In that sentence, “independently” is doing a lot of work. English.gov.cn Phase II operates under the highest temperatures and pressures ever encountered in domestic offshore exploration, operating at water depths exceeding 1,500 meters and well depths surpassing 5,000 meters.
It was constructed using Chinese engineering, Chinese equipment, and Chinese personnel working in some of the most extreme subsea conditions on record. The installation of the underwater manifold systems—the so-called “oil and gas hubs” that gather and direct production from the seabed wells—was referred to by project engineers as a technical challenge. With a combined weight of more than 540 tons, the three manifold centers had to contend with severe hydrostatic pressure, erratic ocean currents, and almost no visibility at the seabed. A deputy manager for the project pointed out that the installation was done during typhoon season, and the quickly changing sea conditions made the already extraordinary operation even more challenging.
English.gov.cnCGTN It’s difficult to ignore how methodically China has overcome this specific obstacle. Ten years ago, the nation was not regarded as a major player in deep-sea energy. Extraction from shallow water was feasible, but anything deeper than a few hundred meters was practically unfeasible without Western or Norwegian knowledge. Shenhai Yihao made two intentional changes to that calculus. Before Phase II even came online, the field had already produced 7 billion cubic meters of natural gas and 700,000 cubic meters of crude oil by early 2024.
These figures demonstrated operational credibility. SASAC The field’s natural gas now flows to coastal terminals in Hong Kong, Sanya, and Zhuhai in Guangdong, feeding into the country’s gas pipeline network and supplying important economic areas. That chain of distribution is important. This is not a geopolitical symbol disguised as an energy asset, nor is it an experimental project. The gas is in motion. In some of China’s most economically dense cities, it powers businesses and heats homes.
English.gov.cn is a more comprehensive image that is worth considering here. Marine geologist Wang Pinxian of the Chinese Academy of Sciences claims that nearly 70% of recently found oil and gas reserves worldwide are located more than a kilometer underwater. The person who can reliably, safely, and without the need to import the necessary equipment reach those reserves will have a substantial long-term advantage.
The completion of Shenhai Yihao, China’s first domestic ultra-deepwater gas field, represents the nation’s move toward deep-sea resource independence. It’s still unclear if that advantage translates into energy security, geopolitical clout, or just cheaper gas prices for Chinese consumers; it’s likely all three, albeit in varying amounts. Global Times The ocean floor is undoubtedly no longer as inaccessible as it formerly appeared. For better or worse, China has demonstrated that it can achieve its goals without the assistance of others.
