CNOOC Limited Discovers a Hundred Million Ton Oilfield In Bohai Sea

China National Offshore Oil Corporation (CNOOC) has announced a major offshore oilfield discovery in the Bohai Sea that significantly expands its conventional hydrocarbon resource base. The discovery of the Qinhuangdao 29-6 oilfield, with proven in-place volumes exceeding 100 million tonnes of oil equivalent, highlights CNOOC’s advances in subsurface exploration and contributes to longer-term domestic energy supply capacity.

Strategic Resource Expansion in Bohai Sea
The Qinhuangdao 29-6 oilfield is located in the central Bohai Sea within Neogene formations characterized by relatively shallow burial depths. Drilling operations at the discovery well reached a depth of 1,688 meters and encountered 66.7 meters of continuous oil-bearing pay zones. Initial well testing indicated production of approximately 2,560 barrels of crude oil per day. CNOOC’s evaluation shows the oilfield’s recoverable resources now exceed 100 million tonnes of oil equivalent, reinforcing the company’s reserve profile.

Technical Differentiation and Subsurface Understanding
CNOOC’s exploration approach for Qinhuangdao 29-6 combined refined geological modeling of hydrocarbon migration and accumulation with enhanced seismic interpretation in slope settings. This methodological integration challenges the conventional industry view that uplifted peripheral slopes serve primarily as migration pathways rather than substantial hydrocarbon accumulators. The identification of significant pay zones within these slope environments reflects a more nuanced understanding of reservoir distribution and fault-controlled trapping mechanisms that can differentiate CNOOC’s exploration outcomes in mature basins.

Competitive Positioning in Offshore Exploration
The discovery underscores CNOOC’s capacity to generate large-scale discoveries in basins that have undergone extensive historical development, illustrating a sustained commitment to fine exploration and technological refinement. In the highly competitive global hydrocarbon exploration sector, the ability to unlock resources in mature offshore environments — such as the Bohai Sea — sets CNOOC apart from peers, particularly by leveraging advanced subsurface characterization and exploration risk management techniques.

Contribution to Energy Security and Future Production
The addition of a hundred-million-tonne class resource in the Bohai Sea supports China’s broader objectives of strengthening domestic energy supply and reducing dependence on imported hydrocarbons. By building a robust resource base through high-impact discoveries, CNOOC aims to underpin future production growth and contribute to national energy security objectives.

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