东濮凹陷伸展连锁断层系统及其演化作用

东濮凹陷NNE向的主干基底断层向深部延伸与深层的拆离滑脱断层衔接在一起,与诱导出的调节断层以不同的方式连接,构成东濮凹陷的伸展连锁断层系统。东濮凹陷不同区段的连锁断层形态表现出不同的几何学和运动学特征。北区兰聊主断层面表现为相对较缓的平面式形态,伸展连锁断层系统总体上为多米诺式半地堑系。中区伸展连锁断层系统总体上表现为大型铲式正断层上盘的一个不对称的地堑。南区兰聊主断层面表现为坡坪式形态,断陷结构相对复杂。东濮凹陷伸展连锁断层系统的演化大体分为4期,不同区带伸展连锁断层系统演化模式不同,对古近系沉积和石油地质条件有较大的影响。

Evolutional Impacts of Extensional Linkage Fault System in Dongpu Sag

Dongpu sag NNE main basement fault extending with increasing depth intersects the deeper decoupling detachment fault and connects to the induced transfer faults in various manners,constituting the extensional linkage fault system in Dongpu sag.Linkage fault system in different sections of Dongpu sag is characterized by diverse geometrical and kinematical features.Northern Lanliao main fault plane develops a comparatively modest formation while the extensional linkage fault system is primarily composed of domino-style half-grabens.Central extensional linkage fault system commonly exhibits an asymmetrical graben located in the hanging-wall of large listric normal fault.Southern Lanliao fault plane shows a ramp-flat shape,a relatively complex rift structure.The evolution of extensional linkage fault system in Dongpu sag can be roughly divided into four periods and evolutional styles,which exert significant impacts on Paleogene sedimentary and petroleum geological conditions.