塔里木西南拗陷新生代构造演化与油气的关系

THE CENOZOIC STRUCTURAL EVOLUTION AND ITS RELATIONSHIP WITH OIL AND GAS ACCUMULATIONIN THE SOUTHWESTERN TARIM DEPRESSION

胡望水 刘学锋 陈毓遂 肖安成 刘生国

Hu Wangshui Liu XueFeng Chen Yusui Xiao Ancheng Liu Shengguo

江汉石油学院地质系, 湖北荆沙434102

Jianghan Petroleum Institute, Jinsha, Hubei 434102

塔里木盆地西南拗陷是长期发展演化的复合前陆拗陷。它在新生代经历了早第三纪构造宁静期、中新世构造主要发展期、上新世构造宁静期和第四纪构造定型期。构造变形以印度板块与欧亚大陆板块的碰撞及幕式推挤为背景,以发育冲断-褶皱和快速沉降为特征。自后陆向前陆,构造变形由强到弱。不同构造单元构造的变形也有其特点。盆地沉降是构造负载与沉积负载共同作用的结果。喜山构造运动不仅加速了烃源岩热演化,而且还产生了大量与断层相关的褶皱,为油气运聚提供了良好的条件。

The southwestern Tarim depression is a compound foreland depression with a longstructural history during the Cenozoic.It has undergone a relatively tranquil phase of theEarly Tertiary,the important Miocene development phase of structures, the relatively quiet phase of the Pliocence and the formation phase of structures of the Quaternary. Thestructural deformation is characterized by the development of fold-thrust belts and a rapidtectonic subsidence,which has resulted from the collision between the india plate and theEurasian plate and from long lasting compression and pushing. The deformation of thestructures is weakened from backland to foreland. The subsidence of the depression has resulted from structural and sedimentary loading. The Himalayan tectonic movement has enhanced the thermal evolution of the source rocks and formed lots of fault-related folds,which provided good conditions for oil and gas migration and accumulation.

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https://doi.org/10.11781/sysydz199603244