The development marks China’s first CCS project and is part of the Enping 15-1 oilfield development.
The oilfield is in the Pearl River Mouth Basin, roughly 190km south-west of Hong Kong.
The Enping 15-1 project, which is said to have high carbon dioxide (CO₂) content, began production in December 2022.
CNOOC owns a 100% stake in the project and is its operator.
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The CO₂ produced from the oilfield will be captured and processed before being injected into the saline water layer under the seabed at a depth of around 800m.
According to CNOOC, the initiative fills the gap in China’s offshore CO₂ storage technology.
The project has the capacity to store about 1.5 million tonnes of CO₂, equivalent to planting around 14 million trees.
CNOOC CEO Zhou Xinhuai said: “The successful commissioning of the Enping 15-1 oilfield CCS demonstration project will strongly support the company’s efforts in increasing reserves and production and pursuing green and low-carbon development.
“CNOOC will continue to gear up its R&D activities, to promote the green development of offshore oilfields, and explore ‘offshore storage of onshore carbon’ to provide a new solution of carbon reduction for the high-emitting enterprises in the coastal areas.”
Earlier this week, the Chinese company announced that the Buzios5 well in the Santos Basin offshore Brazil has commenced production.