塔里木盆地东南侏罗纪断陷盆地形成机理及演化分析

THE ANALYSIS ON THE MECHANISM OF THE FORMATION OF JURASSIC FAULTED BASIN AND ITS EVOLUTION IN THE SOUTHEAST REGION OF TARIM BASIN

塔东南地区侏罗纪断陷盆地的形成受控于构造运动、基底断裂活动等因素.早侏罗世区域弱张性应力环境下断裂的活动是盆地形成的关键因素;NNE向右阶左行状排列的断裂控制盆地的平面展布;二叠纪的中酸性侵入岩规模反映了断陷盆地规模.在两重要因素作用下,形成的断陷盆地整体呈NE走向,断陷盆地内发育的早侏罗世次凹呈NNE向雁列式展布.盆地为典型的不对称箕状断陷盆地.演化划分为断陷期、断坳期和坳陷期,缺少结束充填期.

The mechanism of formation in Southeast Region＇s mesozoic fault basin is mainly controlled by structure＇s movement and faultage of fundus. The factor of basin＇s formation is lias Arerjin fault＇s movement on weak tensile stress environment;The NE faults that Mines is right rank and left travel control basin＇s plane distribution; The scope of Permian intrusive rock reflect fault basin＇s scope. In the two ingredient,fault basion＇s strike is NEE,lias hollow＇s strike is NE en-echelon. Basion is typically anisomerous fault basin like dustpan. Basin＇ s evolution compartmentalize period of rupture, period of rupture and depression, period of depression.The period of filling is absent.