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Differential tectonic evolution and formation mechanism of three subsags in Wenchang Sag of Pearl River Mouth Basin,South China Sea

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Petroleum Science 2023年第3期20卷 1379-1394页

作者： Qiu-Gen Zheng Jun-Liang Li Bao-Hua Lei Peng Song Qi Li De-Feng Shi Hao Liu Chang-Song Lin School of Ocean Sciences China University of Geosciences(Beijing)Beijing100083China Hainan Branch of the China National Ofshore Oil Corporation HaikouHainan570311China Qingdao Institute of Marine Geology QingdaoShandong266237China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Scence and Technoogy(Qingdao)QingdaoShandong26637China

Notable differences in the structural characteristics and evolution of three adjacent sub-sags,i.e.,the Wenchang sub-sags A,B,and C,on the downthrown side of the zhu IlI South Fault in the Wenchang Sag,are significant as they affect the formation and distribution of the oil and gas in these three ***,the differences in their tectonic evolutions and formation mechanisms have not yet been adequately *** this paper,stress analysis,equilibrium profiles,and paleogeomorphic restora-tion,are used to investigate the dynamic settings,formation mechanisms,and influencing factors of the structural deformation related to the formation of the Wenchang Sag based on interpretation of seismic *** results of the stress analysis suggest clockwise deflection of the regional tensile stress direction from a WNW-ESE trend during the Early Paleocene to NW-SE and NNW-SSE trends during the Eocene,to a nearly N-S trend during the Oligocene,and finally to a NNE-SSW trend during the *** clockwise rotation of the regional tensile stress direction led to the formation of a dextral strike-slip stress component parallel to the NE-trending zhu I South *** strike-slip stress component formed a releasing bend in sub-sag A,and may be associated with the continuous subsidence of a thick sedimentary layer in sub-sag *** also created a restraining bend in sub-sag B,which underwent multiple structural inversions during its extension and subsidence and has a relatively s mall sedimentary *** double restraining bend in sub-sag C is considered to have been strongly uplifted and eroded in response to this strike-slip stress *** obvious structural inversions in sub-sag B are iden-tified in this *** structural inversions correspond to the last four regional tectonic *** interpretation suggests that the formation of the structural inversions was likely related to the strong tensile stress and the small intersection angle between

关键词： Strike-slip stress Releasing bend Restraining bend Double restraining bend Structura linversion zhuⅲsouthfault Wenchang sag Northern South China Sea

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