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The right-slip Talas-Ferganhna fault plays significant roles in controlling the strata, structures and petroleum geologicfeatures in Kashi sag since Late Triassic.During the Late Triassic-Middle Jurassic,Kuzgongsu and Kezletaofault basins probably disconnected with each other occurred in the sag,with developed rifted-style source rocks of Lower-Middle Jurassic.During the Neogene-Quaternary,the relevant strike-slip deformation of the fault occurred and controlled the petroleum traps and accumulationsin Kashi sag.