Characteristics of tectonic migration in Qinnan sag of the Bohai Bay Basin and its impact on hydrocarbon accumulation

被引：0
|
作者：
Cai S. [1 ]
Lü D. [1 ]
He D. [1 ]
Zhang J. [1 ]
Yu Y. [1 ]
机构：
[1] Bohai Oilfield Research Institute, Tianjin Branch, CNOOC China Limited, Tianjin
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2019年 / 40卷
关键词：
Bohai Bay Basin; Depocenter; Hydrocarbon accumulation; Qinnan sag; Subsidence center; Tectonic migration;
D O I：
10.7623/syxb2019S2007
中图分类号：
学科分类号：
摘要：
Tectonic migration is a very common geological phenomenon in the process of basin evolution. The characteristics of tectonic migration in Qinnan sag are of great significance for understanding its hydrocarbon accumulation regulation. This study explores the effect of tectonic migration on hydrocarbon accumulation by analyzing the Cenozoic activity, spatiotemporal distribution characteristics of the main controlling boundary faults of each subsag in Qinnan sag, and migration of the depocenter and subsidence center of subsags in various periods. The research suggests that the activity intensity of the main controlling boundary faults in each subsag is significantly different; the tectonic migration in subsags can be divided into two types: self-migration and hetero-migration, characterized by migration from north to south and from west to east; the tectonic migration is reflected in the change of tectonic style, difference in the activity intensity of the main controlling boundary faults and multistage episodic tectonism. The migration of the depocenter and subsidence center in Qinnan sag results from the combined action of extensional strike-slipping and extensional rifting of the large boundary faults in each subsag. Tectonic migration can provide a space for source rocks, influence and control the distribution of source rocks, promote the migration and accumulation of hydrocarbons, and cause differences in petroliferous property of subsags in the horizontal and vertical enrichment layers. The hydrocarbon-rich conditions are different for each subsag in Qinnan sag. There are abundant hydrocarbons in the southeastern subsags, poor exploration degree in the western subsags, and great exploration potential in the eastern subsags. © 2019, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：67 / 78
页数：11
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