【摘要】 基于高分辨率二维地震反射剖面地质解释,认为晚新生代塔里木盆地乌什凹陷具"对冲"构造变形特征.凹陷北侧为南天山冲断体系,自北向南逆冲,主冲断层为神木园断裂,前锋断层为下塔尕克断裂.凹陷南侧为温宿凸起反冲断层体系,自南向北逆冲,主冲断层为古木别兹断裂.由于基底对冲,上覆沉积盖层沿中新统吉迪克组底部和古近系膏盐层向南北两侧滑脱,形成一大型向斜构造,造成深、浅构造层变形差异明显.构造变形开始于上新世库车组沉积期,第四纪加剧,为印藏碰撞"远距离效应"的结果,其对晚新生代构造圈闭发育和油气运移具重要控制作用.更多还原

【Abstract】 Based on new high-resolution seismic profiles,a opposite thrust structural deformation features for late Cenozoic Wushi Sag of northwestern Tarim Basin,northwestern China is proposed in this paper.To the north of the sag is the Southern Tianshan thrust system,of which the faults thrust from the north to the south,the main thrust fault is Shenmuyuan fault,and the front thrust fault is Xiatagake fault;To the south of the sag is the Wensu uplift backthrust system,of which the faults thrust from the south to the north,and the main thrust fault is Gumubiezi fault.Moreover,there develops one detached fault along the gypsum layer on me bottom of Neogene or Paleogene because of the opposite thrust of basement.As a result,the Cenozoic in Wushi area fold a down.Thus,the Wushi sag is in fact a syncline,and the structural deformation is at all different below or on the detached fault above.The structural deformation,happened mainly in the sedimentary period of Kuche Formation of Neogene,and became stronger in the Quaternary,and is the result of collision between India and Asia continents,which has controlling influence on structural trap and petroleum migration of late Cenozoic.更多还原