兰聊断层的几何学、运动学特征对东濮凹陷构造样式的影响

东濮凹陷的古近系充填在由兰聊断层控制的一个复式半地堑断陷中。兰聊断层总体上为铲式断层面形态,但是沿东濮凹陷轴向断层面形态和拆离深度有明显变化。北段为浅层相对缓倾的铲式正断层,拆离面深度约9～12 km;中段为浅层相对陡倾的铲式正断层,拆离深度约为14～16 km;南段为坡坪式正断层,浅层的拆离深度约8 km,深层拆离深度约11～13 km。不同区段的兰聊断层在古近纪不同时期的运动学特征也具有明显的差异,中段的伸展量相对较大。由于兰聊断层的几何学、运动学特征沿东濮凹陷轴向发生变化,导致凹陷的构造样式、沉积作用、石油地质条件有明显的不同。

Impact of geometry and kinematics of Lanliao fault on structural styles in Dongpu sag

Paleogene sediment in Dongpu sag had filled in a complex half-graben controlled by Lanliao fault. Except for an obvious change in its surface and detachment detpth along the axis of Dongpu sag, the Lanliao fault system can be generally described as having a listric surface. The northern segment of the fault system is a relative low-angle listric normal fault with detachment depth of 9-12 kin. The middle segment is a relative highangle listric fault with detachment depth of 14-16 km. The southern segment is a ramp-flat fault with detachment depth of 8 km in the upper part of the fault and of 11-13 km in the lower part of the fault. The kinematics of these segments also vary in different stages at Paleogene, causing the extension proportion to the total extension of Dongpu Sag relatively larger than the rest part Lanliao fault geometry and its kinematics changes along the axis of Dongpu sag, of the middle segment and its of the sag. Under the impact of the depression had developped quite different structural styles, deposit patterns and geological conditions for hydrocarbon accumulation.