Abstract：Because of thrust action of Qilian Fold Belt from south to north in Cenozoic,the complex foreland basin was formed laterally in Jiuquan Basin,having following structures successfully:South-Margin frontland thrust belt,South foreland depression,foreland slope,Heishan-Helishan frontal uplift and Huahai-Jinta post-uplift depression;vertically there is characteristic of double-layer structure that the Cenozoic foreland structural layer was stacked on Mesozoic strengthening structural layer.Mainly through the synthetic study of seismic sections and outcrop,the analysis in the paper centers on the characters of geologic structures and structural deformation in Jiuquan Basin since Neogene and the next oil/gas exploration direction,in which the following acknowledge is gained:the structural deformation of South-Margin frontland thrust belt is characteristic of the lateral stack of multiple thrust belts and structural deformation and structures are characterized by clear east-west segmentation because of the divide action of adjusting fault,the strength of structural deformation is generally showed as strong in west and weak in east and trust block is widely thrust above the Lower Cretaceous;oil geologic condition is superiority in South-Margin foreland thrust belt that is most important oil/gas accumulation zone in that basin,among which the thrust structure on the side of down-thrown of thrust block is main targets of next oil/gas exploration.
