塔里木盆地巴楚凸起油气聚集及分布规律

巴楚凸起是塔里木盆地油气富集单元之一。自奥陶纪以来经历了多次隆升剥蚀与下降沉积的交替过程。经喜马拉雅运动期的断裂褶皱，抬升剥蚀，定型为塔西南前陆盆地的前缘隆起，巴楚凸起发育下寒武统，中-上奥陶统以及石炭系3套烃源岩，奥陶系碳酸盐岩，石炭系碳酸盐岩和碎屑岩3套储集层，5套区域性盖层。圈闭形成干晚海西运动期和喜马拉雅运动期。主要类型为与断层有关的断垒和断鼻，在巴楚凸起有2种基本的油气聚集模式，即石炭系断背斜型和下奥陶统断块山及披覆背斜复合型油气聚集，油气沿断层及不整合面注入储集层，分布受古隆起，断裂不整合及裂缝等因素的控制。

Accumulation and Distribution Patterns of Hydrocarbon in Bachu Arch of Tarim Basin

Bachu arch,one of hydrocarbon abundance units in Tarim basin,has experienced a series of rise and denudation as well as drop and sedimentation since Ordovician period.It is in a shape of frontal uplift in the foreland basin of southwestern Tarim after faulting,folding,rising and denuding in the Himalayan movement period.In Bachu arch,there were developments of three sets of hydrocarbon source rock-Lower Cambrian,Middle and Upper Ordovician and Carboniferous,three sets of reservoirs-Ordovician carbonate rock and Carboniferous carbonate rock and clastic rock and five sets of regional cap formations.The trap took shape in Late Hercynian and Himalayan movement period.The main type of this trap is of the fault-related horst block and faulted block.Bachu arch has two basic oil and gas accumu-lation patterns-Carboniferous faulted anticline oil-gas accumulation and Lower Ordovician block mountain and drape anticline compound oil-gas accumulation.Oil and gas entered the reservoirs along the faults and unconformity surface.Oil and gas distribution was controlled by palaeohigh,fault,unconformity and fracture.