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Geological Structure and Dynamics of the Yinggehai Active Rift Basin,South China Sea

Journal of Earth Science 2023年第6期34卷 1732-1743页

作者： Yue Yao Shaobin Guo Xiaopeng Li Xiaobo Zhao Shenglin He College of Environmental Science and Engineering Tongji UniversityShanghai 200092China The Administrative Centre for China's Agenda 21(ACCA21) Beijing 100038China School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China School of Earth Sciences and Spatial Information Engineering Hunan University of Science and TechnologyChangsha 411100China School of Earth Resources China University of GeosciencesWuhan 430074China Zhanjiang Branch of CNOOC Ltd. Zhanjiang 524057China

The Yinggehai Basin is a unique NNW-trending petroliferous basin in the northwestern South China Sea.This paper mainly utilized stratigraphic,tectonic and seismic data by characterizing the geological structures and conducting the geo-mechanical analysis to study the formation,evolution and dynamics of the Yinggehai Basin.The study indicates that the Ailaoshan-Truong Son extruded terrane is composed of multiple secondary extruded bodies.The Red River fault zone,located within the Qiangtang-Simao-Yinggehai mantle flow channel and basin zone,experienced transform-type sinistral strike-slip motion before the basin forming stage and formed a NW-trending extruded mantle uplift,which activated the Yinggehai basin.After experiencing the rift depression,fault depression,and fault subsidence,the basin eventually formed large-scale,thick sedimentation features with ideal hydrocarbon-forming conditions at the end of the Miocene.Later,the basin dynamically transformed and entered a period of tectonic superposition,reworking,and thermal subsidence.Superposition of the NNW thrust sinistral strike-slip fault zone on the northern Hanoi sub-basin complicated the basin structure.Since the Pliocene,the southern Yinggehai main basin has been transformed into an extensional dextral strike-slip environment that hosted numerous mud diapirs.The thin crust and high geothermal gradient provide favorable conditions for the large-scale accumulation of natural gas.

关键词： Yinggehai Basin Ailaoshan-Truong Son extruded terrane mantle flow channel active rift geodynamics naturalgas

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