辽河盆地与伸展作用有关的构造运动学分析

STRUCTURAL KINEMATICS ANALYSIS RELATED TO EXTENSIONAL MOVEMENT OF LIAOHE BASIN

辽河盆地是中生代大陆内裂谷盆地，以伸展作用为主，同时受到后期走滑作用的改造，构造形式复杂。裂谷盆地的形成、演化是在伸展活动发生复杂而有规律的运动中进行的，表现为水平伸展运动、垂直升降运动、掀斜或翘倾运动等，这是裂谷盆地的主要特征。该盆地的各时期掀斜角度不同造成凹陷的差异性，限制了沉积生油岩的范围，从而决定着油气资源分布。

The investigation indicates that the complex structural patterns within the Liaohe intracontinental rift basin were dominated by the extensional movement and simultaneously deformed by the late down tilting movement just in Mesozoic era. The formation and evolution of the Liaohe intracontinental rift basin was performed complicatedly and sequentially by the characterized movement such as horizontal extensional movement. In this movement, the brittle faulting or ductile extension was resulted from the effects of horizontal stresses on the crust or lithosphere and has divergently been extensioned furthermore as down tilting and vertical displacement, etc. There is a distinctive movement in the fault. It is one of the dominant characteristics of intracontinental rift basin. The threshold of hydrocarbon source rocks for sedimentary environments on which the hydrocarbon resources are depended is limited by the different characteristics of the rift blocks generated from or originated from the various tilted rates in every geologic epoch