关键词: 构造特征, 构造演化, 油气系统, 前陆盆地, 库车

Abstract: Kuche foreland basin is located in the northern part of Tarim area.Its northern boundary is the southern margin's faults of the southern Tianshan orogenic belt.The southern one varied in different geological ages.The structural deformation and evolution of Kuche foreland basin is closely related with the development of the southern Tianshan orogenic belt, both of them developed in an oceanic basin and passive continental margin.Their structural evolution included subduction, closing down of oceanic crust, folding and thrusting in the late Paleozoic planation of the Tianshan orogenic belt and development of extensive lakes in the Mesozoic, orogeny and basing by intracontinental subduction in the Cenozoic.The evolution of Kuche foreland basin can exactly be divided into two main stages i.e. the stage of plate tectonic evolution in the Paleozoic and the stage of intracontinental tectonic evolution in the Mesozoic and Cenozoic.Kuche foreland basin can be classified as four tectonic unites: the thrust belt in the northern basin margin, Baicheng-Yanxia depression deformation belt, Tabei foreland slope belt, and Tazhong forebulge belt.The oil and gas resources are plentiful in Kuche foreland basin.Three petroleum systems can be distinguished: T_2-3k+T_3h lacustrine mudstones, T_3t+J₁₊₂ mudstones of coal measure, and T_3t+J₁₊₂ coal-formed petroleum systems.

Key words: structural characteristics, structural evolution, petroleum system, foreland basin, Kuche