李辉, 陈胜红, 张迎朝, 牛翠银, 张坤坤, 叶绮, 胡高伟. 珠江口盆地珠三坳陷断裂特征与油气成藏[J]. 海洋地质与第四纪地质, 2014, 34(3): 115-124. DOI: 10.3724/SP.J.1140.2014.03115
引用本文: 李辉, 陈胜红, 张迎朝, 牛翠银, 张坤坤, 叶绮, 胡高伟. 珠江口盆地珠三坳陷断裂特征与油气成藏[J]. 海洋地质与第四纪地质, 2014, 34(3): 115-124. DOI: 10.3724/SP.J.1140.2014.03115
LI Hui, CHEN Shenghong, ZHANG Yingzhao, NIU Cuiyin, ZHANG Kunkun, YE Qi, HU Gaowei. FAULTS IN THE ZHU-3 DEPRESSION OF PEARL RIVER MOUTH BASIN AND THEIR CONTROL OVER HYDROCARBON ACCUMULATION[J]. Marine Geology & Quaternary Geology, 2014, 34(3): 115-124. DOI: 10.3724/SP.J.1140.2014.03115
Citation: LI Hui, CHEN Shenghong, ZHANG Yingzhao, NIU Cuiyin, ZHANG Kunkun, YE Qi, HU Gaowei. FAULTS IN THE ZHU-3 DEPRESSION OF PEARL RIVER MOUTH BASIN AND THEIR CONTROL OVER HYDROCARBON ACCUMULATION[J]. Marine Geology & Quaternary Geology, 2014, 34(3): 115-124. DOI: 10.3724/SP.J.1140.2014.03115

珠江口盆地珠三坳陷断裂特征与油气成藏

FAULTS IN THE ZHU-3 DEPRESSION OF PEARL RIVER MOUTH BASIN AND THEIR CONTROL OVER HYDROCARBON ACCUMULATION

  • 摘要: 珠江口盆地珠三坳陷为南海北部陆缘拉张型含油气盆地。受区域构造应力场变化控制,盆地在构造演化过程中主要经历了三期断裂活动,发育了3种类型断裂,古新世-早渐新世发育NE向伸展断裂,晚渐新世-早中新世发育近EW向走滑伸展断裂,中中新世至今发育NW向走滑伸展断裂。主干断裂和次级断裂的平面组合样式主要有平行式、羽状、雁列式、帚状,剖面组合样式主要有Y字形、阶梯状、负花状。断裂活动对珠三坳陷的油气生成、运移、聚集具有重要的控制作用。控凹的主干断裂活动控制了生烃凹陷的分布和烃源岩的热演化,断裂活动控制形成了多种类型圈闭,长期继承性活动断裂是浅层油气藏形成的主要运移通道。主干断裂带是珠三坳陷油气复式富集成藏的有利区带,文昌凹陷北坡断阶带和琼海凸起、阳江低凸起披覆背斜带也是珠三坳陷油气有利成藏区带。

     

    Abstract: The Zhu-3 depression of the Pearl River Mouth Basin is a stretching petroliferous basin beside the continental margin of the northern South China Sea. Controlled by the tectonic stress field, three periods of faulting activity characterized by three types of fault have been recognized. From Paleocene to early Oligocene, early rifting faults were developed in a direction of Northeast. From late Oligocene to early Miocene, middle strike-slip extensional faults were formed in a direction of approximately East West. And from mid Miocene to present, late strike-slip extensional faults were developed in a direction of Northwest. According to the distribution of the main and secondary faults, there are four combination styles in a plane view, including parallel, pinnate, en echelon, and broom-like. In section, there are three combination styles, including ‘Y’ like, stair-stepping and negative flower-like. Fault activities have significant controlling effects on hydrocarbon generation, migration and accumulation in the Zhu-3 Depression. Major faults control the distribution of hydrocarbon generation sags and the thermal evolution of source rocks. Fault activities generated various traps of hydrocarbons. The long-term active faults provided major pathways for hydrocarbon migration to shallow reservoirs. Zones with major faults are the most favorable areas for multiple reservoir formation. The step-fault zone on the northern slope of the Wenchang A sag and the anticlinal belt of the Qionghai uplift and Yangjiang lower uplift are the most favorable areas for hydrocarbon migration and accumulation.

     

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