渤东地区新生代走滑断裂特征及其对油气成藏的影响

Characteristics of Cenozoic strike-slip faults in Eastern Bohai Sea and its influence on hydrocarbon accumulation

渤东地区位于渤海海域渤中凹陷东侧,包括渤东低凸起及渤东凹陷。受郯庐走滑断裂及盆地伸展活动影响,研究区构造运动强烈,地质条件极为复杂,多年来对该区的油气勘探一直处于探索阶段。文中基于覆盖研究区的高分辨率三维地震数据,以走滑断裂发育模式为指导,对该地区的断裂体系进行了系统解剖,阐述了该区新生代走滑断裂的展布特征,重点分析了渤东凹陷中央走滑断裂带的表现特征及其活动期次。在此基础上,研究了该区的断裂成因机制,发现并落实了一批有利的构造圈闭,且就走滑断裂对油气成藏的影响因素进行了探讨。上述研究加深了对该区构造演化及油气成藏的认识,对促进渤东地区今后的油气勘探有重要的指导意义。

Bodong Area, which includes Bodong low uplift and Bodong Depression, is located in the east of Bozhong Depression, Bohai Bay. Influenced by the Tanlu strike-slip fault and basin extensional activities, the tectonic movement is strong and geological condition is very complex, and the exploration research in this area has always been in the early stage. In this paper, based on the high resolution3 D seismic data covering the study area, the strike slip fault development model is established as a guide for systematic analysis of the fracture system in the area. The distribution characteristics of the Cenozoic strike slip fault are explained, developing pattern and its activity period are mainly discussed. On this basis, some payable traps are discovered, and the influence factors of strike slip faults on oil and gas accumulation are discussed. The above work has deepened the understanding of reservoir tectonic evolution and oil and gas accumulation in this area, and has an important acceleration to the future oil and gas exploration in Bodong Area.