Geological structure controls CO_(2) hydrate sequestration in seafloor sediments:A numerical simulation study of anticline,syncline,and inclined reservoirsOA
Sequestration of CO_(2) as hydrates in seafloor sediments is an effective method for reducing CO_(2) emissions.However,the efficiency of CO_(2) hydrate sequestration can be influenced by the geological structure of seafloor reservoirs.To address this,the authors numerically investigate the effects of four reservoir structures(horizontal,inclined,anticline,and syncline)and dip angle on CO_(2) hydrate formation mass and sequestration security.The results show that different geological structures alter the temperature distribution within the reservoir,thereby modifying the stability zone of CO_(2) hydrates.At a dip angle of 30°,the hydrate formation mass(Fhyd)in the inclined,anticline,and syncline structures changes by-19.12%,+6.60%,and-7.19%,respectively,relative to the horizontal structure(baseline:342×10~6 kg).The distance from the top of the CO_(2) hydrate cap to the seafloor mudline(D_(H)),a key security indicator,varies significantly:Compared to 25 m in the horizontal structure,D_(H) changes by+160%,-20%,and+20%for the inclined,anticline,and syncline structures,respectively.As the dip angle increases,Fhyd in the anticline structure increases while D_(H) decreases.In contrast,Fhyd decreases and D_(H) increases in both the inclined and syncline structures.The temperature variation across structures is a key factor influencing Fhyd,while permeability is a major factor affecting the safety of CO_(2) sequestration.Therefore,if Fhyd is the sequestration objective,the anticline structure is the optimal reservoir.If D_(H) is the objective,the inclined structure is the best reservoir.These findings provide critical insights for site selection in marine CO_(2) hydrate sequestration projects.
Shu-xia Li;Zhong-xue Song;Yang Guo;Gao-wei Hu;Lu Liu;Hao Sun;Ben-kui Lou;Jun-hao Liu;Zhen-hao Ren
School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaThe Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266237,China Laboratory for Marine Mineral Resources,Qingdao Marine Science and Technology Center,Qingdao 266237,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,ChinaSchool of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China Shandong Key Laboratory of Offshore Oil&Gas and Hydrates Development,China University of Petroleum(East China),Qingdao 266580,China
海洋科学
CO_(2)hydrate sequestrationGeological structuresHorizontal+inclined+anticline+synclineNumerical simulationStructural dip anglePhase Equilibrium zoneSequestration capacitySequestration safetyCarbon neutralityCCS
《China Geology》 2026 (3)
P.635-651,17
supported by the National Natural Science Foundation of China(U24A20612)the National Key R&D Program of China(2021YFC2800903)。
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