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CO2 geological storage into a lateral aquifer of an offshore gas field in the South China Sea: storage safety and project design |
Liang ZHANG1( ), Dexiang LI1, Justin EZEKIEL1, Weidong ZHANG1, Honggang MI2, Shaoran REN1 |
1. School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao 266580, China
2. Zhanjiang Branch Company of China National Offshore Oil Corporation, Zhanjiang 524000, China |
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Abstract The DF1-1 gas field, located in the western South China Sea, contains a high concentration of CO2, thus there is great concern about the need to reduce the CO2 emissions. Many options have been considered in recent years to dispose of the CO2 separated from the natural gas stream on the Hainan Island. In this study, the feasibility of CO2 storage in the lateral saline aquifer of the DF1-1 gas field is assessed, including aquifer selection and geological assessment, CO2 migration and storage safety, project design, and economic analysis. Six offshore aquifers have been investigated for CO2 geological storage. The lateral aquifer of the DF1-1 gas field has been selected as the best target for CO2 injection and storage because of its proven sealing ability, and the large storage capacity of the combined aquifer and hydrocarbon reservoir geological structure. The separated CO2 will be dehydrated on the Hainan Island and transported by a long-distance subsea pipeline in supercritical or liquid state to the central platform of the DF1-1 gas field for pressure adjustment. The CO2 will then be injected into the lateral aquifer via a subsea well-head through a horizontal well. Reservoir simulations suggest that the injected CO2 will migrate slowly upwards in the aquifer without disturbing the natural gas production. The scoping economic analysis shows that the unit storage cost of the project is approximately US$26‒31/ton CO2 with the subsea pipeline as the main contributor to capital expenditure (CAPEX), and the dehydration system as the main factor of operating expenditure (OPEX).
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| Keywords
DF1-1 gas field
CO2 storage
lateral saline aquifer
storage safety
project design
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Corresponding Author(s):
Liang ZHANG
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Issue Date: 01 January 2023
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