Offshore CO2-EOR: Worldwide Progress and a Preliminary Analysis on Its Potential in Offshore Sedimentary Basins off China
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Abstract
CO2-Enhanced Oil Recovery (CO2-EOR) is a technique of enhancing oil recovery by injecting CO2 into oil reservoirs. It also realizes both CO2 utilization and CO2storage and thus is an important technique in the CCUS chain. In recent decade the application of CO2-EOR is extended rapidly from inland to offshore, as a respond to the increasing demand for offshore CO2 storage. This paper briefed the concept and application conditions of CO2-EOR, and introduced worldwide projects and technical developments on offshore CO2-EOR, including the "Next Generation" CO2-EOR technology. A first-order preliminary review on the potential of CO2-EOR in offshore sedimentary basins off China was given for the first time based on comparison and analysis of petroleum geology of the basins. The Bohai Bay Basin (offshore) and the Pearl River Mouth Basin are regarded as having the potential of non-miscible and miscible CO2-EOR, respectively. The CO2-EOR application in these basins might be able to bring several hundred million tons of incremental oil production and to store several hundred million tons of CO2 underground permanently. Further studies and evaluations are needed urgently.
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