辽河盆地是两期构造应力作用的产物：来自构造物理模拟实验的新认识  

TWO PHASE OF STRUCTURAL STRESS IMPACTS ON LIAOHE BASIN:NEW EVIDENCES FROM TECTONOPHYSICAL MODELING EXPERIMENTS

作　　者：汪道京[1] 张占文[2] 肖乾华[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国石油辽河油田勘探开发研究院,辽宁盘锦124010

出　　处：《大地构造与成矿学》2008年第2期143-150,共8页Geotectonica et Metallogenia

基　　金：辽河油田项目(编号:LH-243)资助.

摘　　要：辽河盆地营口-佟二堡断裂带形成和演化的新构造物理模拟实验结果和地质资料分析证明，营口-佟二堡断裂带成因机制归因于早期大陆裂谷演化阶段的地幔上涌派生拉张应力和后期右行走滑构造运动引起的右行剪应力的复合作用。大陆裂谷的演化受古近纪古新世房身泡期至始新世沙河街一期（Ef-Es1，大约63．0—37．0Ma．BP）地幔上涌派生拉张应力的驱动，右行走滑构造运动发生在古近纪渐新世东营期（Ed，大约36．9—24．5Ma．BP），两期构造运动导致了辽河盆地营口-佟二堡复杂断裂体系的形成和演化。裂谷演化阶段后的右行走滑构造运动使得早期断裂再活动并形成新的断裂。基于构造物理模拟实验结果和地质资料分析，辽河盆地古近纪渐新世东营期右行走滑构造运动引起的水平位移大约为4—8km，辽河盆地营口-佟二堡断裂带不仅受到早期拉张应力的强烈控制，而且还受到后期右行走滑构造运动的影响，由此认为，两期构造运动决定了现今所勘探到的复杂含油气构造体系的展布，并导致了该区油气的运移和聚集。New results from modeling experiments and geological information analysis indicate that mechanism of the Yingkou - Tongerpu fracture zone in the Liaohe Basin, China is due to composite actions of both older extensional stresses from upwelling of the mantle during the continental rift and younger dextral shear stresses from dextral strike-slip structural movement. The evolution of the continental rift is driven by extensional stresses from upwelling of the mantle during the Fangshenpao and Shahejie phases of the Paleocene and Eocene, Paleogene times （ Ef- Es1 , about 63.0 - 37.0 Ma. BP）. The dextral strike-slip structural movement occurred during the Dongying phase of Oligocene and Paleogene times （ Ed, about 36.9 - 24.5 Ma. BP）. Two phases of the structural movements led to formation and evolution of the complex fracture system in the Liaohe Basin. It is suggested that the dextral strike-slip structural movement of post-rift reactivated older extensional fractures and produced new fractures. On the basis results from modeling experiments and analysis of geological information, the displacement magnitudes of the Liaohe Basin caused by the dextral strike-slip structural movement during the Dongying phase of Paleogene times （Ed） is about 4 - 8km. New studies prove that complex fracture systems of the Liaohe Basin are not only strongly controlled by older extensional stresses, but also influenced by the younger dextral strike-slip structural movement. Two phase structural movement resulted in oil and gas migration and accumulation in this area.

关 键 词：辽河盆地 营口-佟二堡断裂带 成因机制 构造物理模拟实验 

分 类 号：P554[天文地球—构造地质学]