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塔里木盆地的天然气主要富集在第三系、白垩系、侏罗系、三叠系、奥陶系五个层系中，其主要气藏的储层特征如下。奥陶系主要发育风化壳型储层和内幕型储层，前者主要位于奥陶系顶部碳酸盐岩中，储层类型以裂缝和裂缝—孔洞型为主；后者在塔中地区极为发育，地层中构造缝虽不发育，却可见到大型溶蚀孔洞。三叠系主要发育扇三角洲—湖相储层，它主要分布在塔北地区，储集空间以原生孔隙为主。侏罗系主要发育三角洲—河流相储层，主要集中在塔北地区东河１号构造及库车坳陷依南构造带上，影响该套储层好坏的因素有两个方面：其一是沉积环境，其二是裂缝，这是侏罗系储层形成工业油气藏的关键因素。白垩系主要发育了三角洲前缘相—扇三角洲平原相储层，主要分布在克拉苏构造带，储集空间类型以原生的粒间孔为主。第三系主要发育了冲积扇—洪泛平原相储层，主要分布在轮台断隆构造带，即目前塔里木盆地凝析气储量最大的构造带。

Reservoir Bed Characteristics of the Major Gas Reservoir in Talimu Basin

The natural gas in Talimu Basin is mainly found in five series of strata, i.e. Tertiary, Cretaceous, Jurassic, Triassic and Ordovician. The reservoir bed characteristics of the major gas reservoirs in them are as follows. The weathering crust reservoirs and inside reservoirs are mainly developed in Ordovician; the former are dominantly distributed in the carbonate rocks on the top of Ordovician, the reservoir chiefly belonging to fracture cavity type; the latter are widely developed in Tazhong region, in which the structural fractures are undeveloped, but the large sized solution pores and cavities can be found. The fan delta lacustrine facies reservoirs are mainly developed in Triassic in Tabei region, their storge space being dominantly the original pores. The delta fluvial facies reservoirs are dominantly developed in Jurassic being mainly concentrated in the Donghe 1 structure of Tabei region and the Yinan structural belt in Kyche Depression; the key factors of forming commercial oil and gas reservoirs in Jurassic are the sedimentary environment and fractures. The delta front fan delta plain facies reservoirs are chiefly developed in Cretaceous in Kelasu structural belt, the storage space being mainly the original intergranular pores. Finally, the alluvial fan flood plain facies reservoirs are dominantly developed in Tertiary in the structural belt of Luntai Faulted Uplift where the largest condensate gas reserves have been found in Talimu Basin at present.