渤海湾盆地新生代断裂活动与含油气系统形成

渤海湾盆地是一个以新生代为主要成盆期的大型板内裂谷盆地,断裂和裂陷活动是新生代构造变形的主导方式,对含油气系统形成及其特征有广泛和深刻的影响。数量众多、走向不同断裂的活动,形成多断块多断陷和凹凸相间的构造格局,奠定了多含油气系统发育的基础。断裂幕式活动,引起沉积空间和湖盆范围周期性扩张与收缩,控制了生储益及其组合特征。裂陷中心从盆地外带向盆地中心迁移,使得盆地不同部分凹陷发育史不同,形成三种类型凹陷。不同类型凹陷的含油气系统特征明显不同,其主要生储盖组合时代、油气生成-运移-聚集作用过程、圈闭形成史和油气分布特点均有差异。

Cenozoic Faulting and its Influence on the Formation of Petroleum Systems in Bohai Bay Basin.

Bohai Bay basin is a huge intro-plate rift basin de-velobed mainly in Cenozoic. Faulting and rifting wereits predominent way of tectonic deformation, and hada broad and profound influence on the formation ofpetroleum systems and their features. Numerous faultswith different trending decided the nature of structureframework, characterized by the formation of multi-fault blocks, multi-half grabens and multi-uplifts,which laid down a foundation for the development ofmulti-petroleum systems in the basin. Episodic faultactivities led to cyclic expansion and reduction of thedepositional accommodation space and the lake extentarea, and in turn controlled the development and basiccharacteristics of source rocks, reservoir, sealing lay-ers and their assemblages. The shifting of rifting cen-ter from outer part of the basin to the central part re-sulted in three types of sags with different developing history in the different part of the basin. The petro-leum developed in each type of sag is different fromeach other in the major assemblage of source rock, re-servoir and sealing layers, hydrocarbon generation-migration-accumulation processes, trap formationhistory, and oil and gas pool distribution.