珠江口盆地靖海凹陷多边形断层系统成因及油气成藏意义

doi:10.11743/ogg20170216

Abstract

Abstract: Small normal faults are well developed in the Miocene in Jinghai Sag of the Pearl River Mouth Basin and they are characterized by close spacing,highly variable strike,limited trace length,small throw,steep dip,crosscutting and polygonal geometry on plane view.Comprehensive study reveals that they are non-tectonic origin.A polygonal fault system (PFS) consists of small normal faults formed due to periodical pressure release induced by shallow overpressure.The overpressure is mainly caused by differential compaction,aquathermal pressuring and chemically driven volumetric contraction (syneresis) due to rapid sediment deposition.During the Eocene and Oligocene,Jinghai Sag experienced lithospheric stretching,followed by thermal subsidence in the Early and Middle Miocene,with the deposition environment evolved from lacustrine-neritic facies to bathyal-abyssal facies.The poor development of growth faults which play a key role in connecting the source rock of lacustrine-neritic facies and reservoir of bathyal-abyssal facies resulted in the absence of vertical hydrocarbon migration pathways.Polygonal faults are highly developed in the Miocene Zhujiang and Hanjiang Formations in Jinghai Sag and can act as hydrocarbon migration pathways,thus are highly significant for hydrocarbon accumulation during post-rift thermal subsidence.

Key words: polygonal fault system, hydrocarbon migration, hydrocarbon accumulation, Jinghai Sag, Pearl River Mouth Basin

CLC Number:

TE122.1

Jiang Ning, He Min, Liu Jun, Xue Huaiyan, Zheng Jinyun, Zhang Qinglin. Genetic mechanism and hydrocarbon accumulation of polygonal fault system in Jinghai Sag of the Pearl River Mouth Basin[J]. Oil & Gas Geology, 2017, 38(2): 363-370.

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Genetic mechanism and hydrocarbon accumulation of polygonal fault system in Jinghai Sag of the Pearl River Mouth Basin

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