辽河盆地古近纪二期构造演化特征的研究  

STUDY ON CHARACTERS OF TWO PHASES STRUCTURAL EVOLUTION AT THE LIAOHE BASIN,CHINA DURING PALEOGENE TIMES

作　　者：单家增[1] 孙红军[2] 肖乾华[2] 汪道京[1] 许坤[2] 刘晓峰[2] 申大媛[2] 孙素青[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]中国石油辽河油田分公司勘探开发研究院,盘锦124010

出　　处：《地球物理学报》2003年第1期73-78,T001,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目 (49472 1 39);辽河油田资助项目 (LH一 2 4 3) .

摘　　要：辽河盆地新的地球物理证据和构造物理模拟实验结果表明 ,辽河盆地古近纪的构造史由二期组成 ,即大陆裂谷期和右行走滑构造运动期 .大陆裂谷的演化受古近纪古新世至始新世房身泡期至沙河街期 (Ef～Es,大约6 3.0～ 37.0Ma)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 .9～2 4.5Ma) .二期构造运动导致了辽河盆地复杂断裂体系的形成和演化 .裂谷后的右行走滑构造运动使得早期断层再活动和生成新的断层 .基于物理模拟实验结果和地球物理资料分析 ,古近纪东营期右行走滑构造运动引起的水平位移大约为 4～ 8km .辽河盆地复杂的断裂体系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 .与此同时 ,二期构造运动导致了该区油气的运移和聚集 .New geophysical evidence and the results of the modeling experiment indicate that the structural history of the Liaohe basin,China during the Paleogene times consists of two phases,a continental rift phase and a dextral strike-slip phase.The continental rift is driven by extensional stresses from upwelling of the mantle during the Fangshenpao and Shahejie phases of Paleocene and Eocene,Paleogene times(Ef-Esl,about 63.0～37.0Ma).The dextral strike-slip movement occurred during the Dongying phase of Oligocene,Paleogene times(Ed,about 36.9～24.5Ma).Two phases of the structural movement lead to forming and evolution of complex fault system in the Liaohe basin.It is suggested that dextral strike-slip movement of post-rift reactivated older extensional faults and produced new faults.On the basis of results from modeling experiments and analysis of geophysical information,the displacement magnitudes caused by dextral strike movement during the Dongying phase of Paleogene times(Ed)is about 4～8km.New studies prove that complex fault systems of the Liaohe basin are not only strongly controlled by older extensional stresses,but also influenced by younger dextral strike-slip movement.Two phase structural movement resulted in oil and gas migration and accululation in this area.

关 键 词：辽河盆地 古近纪 地球物理证据 油气运移 油气聚集 构造运动 断层 

分 类 号：P534.6[天文地球—古生物学与地层学]