Abstract：Located in the north of Alxa massif in the middle part of Hexi Corridor,the Yabulai is a Me-sozoic superimposed basin.It mainly experienced four evolution stages:basin formation in early and middle Jurassic,compression uplift in late Jurassic,basin formation in early Cretaceous,and compression thrust in late Cretaceous.The distribution of source rocks and reservoir facies belts in Lower Jurassic was controlled by the extensional fault depression stage of Early and Middle Jurassic,and the overall uplift of Late Jurassic resulted in local-inversion structural traps.The basin-forming and evolution stages of the Early Cretaceous extensional fault depression promoted the maturation and evolution of Jurassic source rocks,and the basement involvement thrusting occurred in the southern margin of the basin during the compression and thrust stages of the Late Cretaceous,forming a series of structural traps,which is the main period of hydrocarbon accumulation in the basin.Structural-lithological targets of Xiaohu subsag and structural targets of Xiaohu-Hongciliang in the southern thrust belt are key objectives of the hydrocarbon exploration in the Yabulai Basin.
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