Cenozoic Tectonic Evolution and Hydrocarbon Accumulation of Taian-Dawa Fault Zone, Liaohe Sag

doi:10.3969/j.issn.1006-6535.2021.06.002

Abstract

Abstract: With abundant oil and gas resources, Taian-Dawa Fault Zone is one of the most important hydrocarbon-bearing zones in Liaohe Sag. The tectonic characteristics and evolution of the Fault Zone were analyzed to explore the relationship between the tectonic evolution and hydrocarbon accumulation in the Fault Zone. A study was performed on hydrocarbon accumulation mode to work out the effect of Cenozoic tectonic evolution on hydrocarbon accumulation in Taian-Dawa Fault Zone, providing guidance in the optimization of exploration fields and targets of the Fault Zone. The results of the study showed that Taian-Dawa Fault Zone was characterized by both extensional and strike-slip inversed tectonics and its tectonic evolution was divided into three stages: faulting period, dextral slip period and depression period. The tectonic evolution significantly controlled the hydrocarbon accumulation in the Fault Zone, specifically controlling the migration of subsidence center from north to south, the reservoir development, the formation of complex petroleum migration pathways, and the matching between fault activities and hydrocarbon discharge. The hydrocarbon accumulation patterns and favorable exploration areas in the north and south of the Fault Zone were identified, providing a basis for the next exploration deployment in the Fault Zone.

Key words: tectonic evolution, Cenozoic, accumulation mode, Dawa Fault, Taian-Dawa Fault Zone

CLC Number:

TE122.2

Shan Junfeng, Chen Chang, Zhou Xiaolong, Fang Hong. Cenozoic Tectonic Evolution and Hydrocarbon Accumulation of Taian-Dawa Fault Zone, Liaohe Sag[J]. Special Oil & Gas Reservoirs, 2021, 28(6): 11-19.

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