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塔西南坳陷自中生代早期以来进入陆相沉积发育阶段 ,由于天山隆升及昆仑山的俯冲 ,塔西南地区侏罗系表现出西岸陡、东岸缓的断陷盆地特征。研究表明 ,侏罗纪断陷湖盆共发育 Gms,Gm,Gt,Gpb,Glp,M等 19种岩石相类型和冲积扇相、扇三角洲相、辫状三角洲相、正常三角洲相及湖泊相等 5种沉积相类型。西岸陡坡带以冲积扇和扇三角洲沉积为主 ,东岸缓坡带以河流三角洲、辫状三角洲占优势 ,盆地中心为湖相沉积。不同的沉积相类型出现在盆地发育的不同阶段 ,并由不同的岩石相构成
The southwestern Tarim Basin entered the stage of terrigenous sedimentation since the early Mesozoic. Due to the uplift of Tianshan Mountains and the subduction of the Kunlun Mountains, the Jurassic in the southwestern Tarim Basin shows the characteristics of faulted basins with steep and easterly east coasts. The study shows that there are 19 kinds of lithofacies and alluvial fan facies such as Gms, Gm, Gt, Gpb, Glp, M, fan delta facies, braided delta facies, normal delta facies and lakes in the Jurassic faulted lacustrine basin Sedimentary facies. The steep slopes in the West Bank are dominated by alluvial fans and fan delta deposits. The gentle slope belt on the east bank is dominated by river delta and braided delta, and the center of the basin is lacustrine sediments. Different types of sedimentary facies appear at different stages of basin development and are composed of different lithofacies