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

石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (2): 363-370.doi: 10.11743/ogg20170216

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

江宁, 何敏, 刘军, 薛怀艳, 郑金云, 张青林

中海石油(中国)有限公司深圳分公司, 广东深圳 518000

收稿日期:2015-08-28 修回日期:2017-02-25 出版日期:2017-04-28 发布日期:2017-05-04
第一作者简介:江宁(1985-),男,工程师,石油地质。E-mail:jiangning@cnooc.com.cn。
基金项目:
国家科技重大专项（2008ZX05025-006-03）。

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

Jiang Ning, He Min, Liu Jun, Xue Huaiyan, Zheng Jinyun, Zhang Qinglin

Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong, 518000, China

Received:2015-08-28 Revised:2017-02-25 Online:2017-04-28 Published:2017-05-04

摘要/Abstract

摘要： 珠江口盆地靖海凹陷中新统发育大量密集分布、走向多变、延伸长度有限、断距小、倾角陡且互相切割及平面上呈多边形几何特征的小型正断层。综合研究认为，该系列小断层为非构造成因的多边形断层。多边形断层是由于地层超压诱导的周期性压力释放而形成的微裂缝，超压成因以快速沉积造成的不均衡压实为主，带动水热增压作用和矿物脱水作用。靖海凹陷由始新世-渐新世裂谷断陷期，过渡为早中新世-中中新世的裂后热沉降期，沉积由近海浅湖相过渡为深海-半深海相，沟通断陷期陆相及浅海相烃源岩和坳陷期深海-半深海相储集层的长期断裂不发育,缺乏油气垂向运移的主要通道，成为制约该期成藏的关键因素。多边形断层在靖海凹陷中新统珠江组和韩江组中广泛发育，可作为油气运移的输导通道，起到对油气运移分流调节作用，控制成藏区带分布，对靖海凹陷裂后热沉降期油气成藏具有重要的意义。

关键词: 多边形断层, 油气运移, 油气成藏, 靖海凹陷, 珠江口盆地

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

中图分类号:

TE122.1

江宁,何敏,刘军,等. 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[J]. 石油与天然气地质, 2017, 38(2): 363-370. doi: 10.11743/ogg20170216 Jiang Ning,He Min,Liu Jun,et al. 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. doi: 10.11743/ogg20170216

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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

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

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