珠江口盆地西江主洼低角度边界正断层特征及成因演化

doi:10.11743/ogg20200316

Abstract

Abstract: The Xijiang Main Sag,located in the west-central Zhu-1 Depression,is one of the most important hydrocarbon-rich sags in the Pearl River Mouth Basin,China.To recognize the properties of the boundary fault (Fxj33) in the Xijiang Main Sag,we comprehensively analyze the geometry and kinematics of Fxj33,using high-resolution 3-D seismic data under the constraints of well data.The results show that the boundary fault Fxj33 of about 55 km long and up to 9.5 km displacement at most,is a NEE-trending low-angle normal fault with a dip of 5°-36°.During the evolution of multistage rifting,the fault Fxj33 is characterized by differential activities of different segments along the strike,and jointly controls the evolution of the sub-sags in the Xjiang Main Sag together with the two lines of EW-trending high-angle normal faults.Various structures developed in the Mesozoic basement,including imbricate structures,residual hills and pre-existing fault planes,indicate that the boundary fault Fxj33 was developed by the inversion of the pre-existing Mesozoic thrusting system in the Cenozoic,and subsequently reformed by the EW-trending high-angle fault planes cutting into it during the middle-to-late rifting stage.The research results are expected to be of referential meaning to the study of the boundary faults during rifting in passive margin faulted basins.

Key words: pre-existing structural system, multistage rifting, low-angle normal fault, Xijiang Main Sag, Pearl River Mouth Basin

CLC Number:

TE121.1

Deng Peng, Mei Lianfu, Du Jiayuan, Ye Qing, Xu Xinming, Wu Jing, Dong Xiaoyun. Characteristics and genetic development of a low-angle boundary normal fault in Xijiang Main Sag,Pearl River Mouth Basin,China[J]. Oil & Gas Geology, 2020, 41(3): 606-616.

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Characteristics and genetic development of a low-angle boundary normal fault in Xijiang Main Sag,Pearl River Mouth Basin,China

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