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Geometry and 3D seismic characterisation of post-rift normal faults in the Pearl River Mouth Basin, northern South China Sea

文献类型：期刊论文

作者Liu, Yuanhang1,2; Gao, Jinwei1,2; Chen, Wanli2; Wang, Jiliang2; Khan, Umair2
刊名ACTA OCEANOLOGICA SINICA
出版日期2024-04-01
卷号43期号:4页码:25-39
关键词Post-rift normal faults fault throw Karst caves Corrosive fluids Pearl River Mouth Basin South China Sea
ISSN号0253-505X
DOI10.1007/s13131-024-2337-4
英文摘要Based on high-resolution 3D seismic data acquired in the Pearl (Zhujiang) River Mouth Basin of the northern South China Sea, this study investigated the geometry, spatial extension, and throw distribution of the post-rift normal fault through detailed seismic interpretation and fault modeling. A total of 289 post-rift normal faults were identified in the study area and can be classified into four types: (1) isolated normal faults above the carbonate platform; (2) isolated normal faults cutting through the carbonate platform; (3) conjugate normal faults, and (4) connecting normal faults. Throw distribution analysis on the fault planes show that the vertical throw profiles of most normal fault exhibit flat-topped profiles. Isolated normal faults above the carbonate platform exhibit roughly concentric ellipses with maximum throw zones in the central section whereas the normal faults cutting through the carbonate platform miss the lowermost section due to the chaotic seismic reflections in the interior of the carbonate platform. The vertical throws of conjugate normal faults anomalously decrease toward their intersection region on the fault plane whereas the connecting normal faults present two maximum throw zones in the central section of the fault plane. According to the symmetric elliptical distribution model of fault throw, an estimation was made indicating that normal faults cutting through the carbonate platform extended downward between -1 308 s and -1 780 s (two-way travel time) in depth and may not penetrate the entire Liuhua carbonate platform. Moreover, it is observed that the distribution of karst caves on the top of the carbonate platform disaccord with those of hydrocarbon reservoirs and the post-rift normal faults cutting through the carbonate platform in the study area. We propose that these karst caves formed most probably by corrosive fluids derived from magmatic activities during the Dongsha event, rather than pore waters or hydrocarbons.
WOS关键词SEGMENT LINKAGE ; FLUID-FLOW ; GROWTH ; DISPLACEMENT ; MARGIN ; SLIP ; ZONE ; MAGMATISM ; DISTRIBUTIONS ; TRANSITION
资助项目National Natural Science Foundation of China[42276066] ; Key Research and Development Program (International Science and Technology Cooperation Development Program) of Hainan Province[GHYF2022009] ; Youth Innovation Promotion Association of CAS[2018401]
WOS研究方向Oceanography
语种英语
WOS记录号WOS:001269641500005
出版者SPRINGER
资助机构National Natural Science Foundation of China ; Key Research and Development Program (International Science and Technology Cooperation Development Program) of Hainan Province ; Youth Innovation Promotion Association of CAS
源URL[http://ir.idsse.ac.cn/handle/183446/11500]  
专题研究生部
深海科学研究部_深海地球物理与资源研究室
通讯作者Gao, Jinwei
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya 572000, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Yuanhang,Gao, Jinwei,Chen, Wanli,et al. Geometry and 3D seismic characterisation of post-rift normal faults in the Pearl River Mouth Basin, northern South China Sea[J]. ACTA OCEANOLOGICA SINICA,2024,43(4):25-39.
APA Liu, Yuanhang,Gao, Jinwei,Chen, Wanli,Wang, Jiliang,&Khan, Umair.(2024).Geometry and 3D seismic characterisation of post-rift normal faults in the Pearl River Mouth Basin, northern South China Sea.ACTA OCEANOLOGICA SINICA,43(4),25-39.
MLA Liu, Yuanhang,et al."Geometry and 3D seismic characterisation of post-rift normal faults in the Pearl River Mouth Basin, northern South China Sea".ACTA OCEANOLOGICA SINICA 43.4(2024):25-39.

入库方式： OAI收割

来源：深海科学与工程研究所

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