塔里木盆地巴楚隆起构造格架及形成演化

巴楚隆起是塔里木盆地重要的油气勘探地区之一。文中基于新的地震、航磁、重力等资料解释结果和区域构造演化剖面,重新分析了巴楚隆起的构造格架及形成演化。研究认为:巴楚隆起在剖面上为压扭性断裂控制的"两断夹一隆"构造样式,在平面上具有"东西分区、南北分带"的构造格局。此与塔里木盆地断裂构造体系的展布、基底结构与构造、地壳深部地质背景及古构造应力场演变等关系密切。该隆起是一个从震旦纪开始发育演化的继承性活动型古隆起,其形成演化经历了加里东构造旋回阶段(Z—D2)、海西构造旋回阶段(D3—P)、印支—燕山构造旋回阶段(T—K)和喜马拉雅构造旋回阶段(E—Q)。这一新认识对巴楚地区的油气勘探部署和潜力评价均具有重要指导作用。

Structural framework and evolution of Bachu uplift in Tarim basin

The Bachu uplift is one of the most important oil and gas exploration area in the Tarim basin.Based on the new results of seismic,aeromagnetic and gravity data interpretation,and on regional tectonic evolution of the profiles,we re-analyze the tectonic framework of the Bachu uplift and the evolution of its formation.The study reveals that the Bachu uplift shows a structural style of "one uplift between two faults" in the profile,which is controlled by the compresso-shear faults,and that it shows a structural pattern of "zoned from east to west,divided into bands from north to south" in the plane,which is closely related to the distribution of fault structure system in the Tarim basin,the basal structures and tectonics,the geological background of deep crust and the evolution of the palaotectonic stress field.The uplift is an inherited mobile paleouplift that began its development and evolution in the Sinian.Its formation and evolution experienced the stage of Caledonian tectonic cycle(Z-D2),the stage of Hercynian tectonic cycle(D3-P),the stage of Indo-Yanshan tectonic cycle(T-K) and the stage of Himalayan tectonic cycle(E-Q).This new understanding is of great guiding significance in the deployment of oil and gas exploration and the evaluation of potentiality.