Control Effect of the Paleomarine Environment on Gas Hydrate Reservoir Since the Pleistocene in the Dongsha Area,Northern South China SeaOA
The Dongsha area,a key target for gas hydrate exploration,is influenced by multiple factors,including sedimentary processes and the paleoenvironment,which play critical roles in gas hydrate formation.To elucidate the coupling among sedimentary processes,paleoenvironment,and gas hydrate accumulation,this study investigates the Site DS-W16 using particle size analysis,biological component content,and geochemistry data.Oxygen isotope data from foraminifera and biostratigraphic evidence indicate that sedimentation at the bottom of core interval from Site DS-W16 began during MIS 11(Marine isotope stage).The sedimentation dynamics of the studied layers are complex,involving gravity flows,traction currents,and suspended deposition.Organic matter shows a significant correlation with transgressive-regressive cycle.The site DS-W16 contains two distinct gas hydrate reservoirs:a shallow reservoir(10-24 mbsf)and a deep reservoir(below 182 mbsf).The paleomarine environment influences gas hydrate accumulation by altering sedimentary processes and sediment characteristics,especially the distribution of biological components.Both shallow and deep gas hydrate reservoirs formed under dynamic conditions dominated by traction currents and are characterized by a higher abundance of foraminifera.Sedimentary layers rich in foraminifera and modified by traction currents represent key intervals for preferential gas hydrate accumulation.
XU Hongyuan;BAI Chenyang;CHEN Wenlin;XU Xiaolei;WANG Yuhan;WANG Hongbin
School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China Key Laboratory of Polar Geology and Marine Mineral Resources(China University of Geosciences at Beijing),Ministry of Education,Beijing 100083,ChinaSchool of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China Key Laboratory of Polar Geology and Marine Mineral Resources(China University of Geosciences at Beijing),Ministry of Education,Beijing 100083,China Laboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao,Shandong 266237,China Hainan Institute,China University of Geosciences(Beijing),Sanya,Hainan 572025,ChinaSchool of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China Key Laboratory of Polar Geology and Marine Mineral Resources(China University of Geosciences at Beijing),Ministry of Education,Beijing 100083,ChinaSchool of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China Key Laboratory of Polar Geology and Marine Mineral Resources(China University of Geosciences at Beijing),Ministry of Education,Beijing 100083,ChinaSchool of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,ChinaLaboratory for Marine Mineral Resources,Laoshan Laboratory,Qingdao,Shandong 266237,China Qingdao Institute of Marine Geology,China Geological Survey,Qingdao,Shangdong 266237,China
天文与地球科学
gas hydrate accumulationpaleoenvironmentsedimentary processorganic matterforaminiferaDongsha area
《Acta Geologica Sinica(English Edition)》 2026 (1)
P.200-219,20
supported by National Natural Science Foundation of China(No.42376217)Fundamental Research Funds for the Central Universities of China(No.3-7-10-2025-03)National Key Research and Development Program of China(No.2024YFC2814702).
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