郯庐断裂对渤海海域东部油气成藏的控制作用

Dominating action of Tanlu Fault on hydrocarbon accumulation in eastern Bohai Sea area

利用渤海连片三维地震资料,对郯庐断裂进行了三维可视化解释,系统地研究了海域新生代以来郯庐断裂在古近纪、新近纪、第四纪的发育、发展以及几何学、运动学、动力学特征,研究了郯庐断裂对渤海油气成藏的影响和控制。结果表明,郯庐断裂是控制渤海海域油气成藏的重要因素,它控制了始新世、渐新世湖相烃源岩的形成,造就了大量的油气圈闭,主导了油气输导系统,而且新构造期沿郯庐断裂带的天然地震活动也可能是导致油气成藏的主要动力。郯庐断裂的晚期活动推进了渤海油气在新近纪晚期成藏,也促成了油气田至今的动平衡成藏。

The 3D seismic data of Bohai Sea area were used to make 3D visualization interpretation for Tanlu Fault zone. The systemic studies on the development, and geometry, kinematics and dynamics of Tanlu Fault zone in the Paleogene, Neogene and Quaternary of this area since Cenozoic showed that Tanlu Fault zone is an important factor for controlling the hydrocarbon accumulation in Bohai Sea area. i. e. Tanlu Fault zone controlled the formation of lacustrine source rocks in the Eocene and Oligocene during the Paleogene extension rifting period, formed and reconstructed lots of traps, dominated oil and gas conduction system, and the natural earthquake activities during the Neotectonic period could improve hydrocarbon accumulation in this area. The late activity of Tanlu Fault zone advanced hydrocarbon accumulation in the Late Neogene and also advanced the dynamic balance of oilfields at present.