准噶尔盆地是中国西部大型内陆含油气盆地,具有多套含油层系,尤其是二叠系,既是盆地的主力烃源岩,也是盆地一个重要的含油层系。同时,上石炭统和二叠系的构造格架也控制了准噶尔盆地后期构造格局和演化。但长期以来,对盆地上石炭统及二叠系的划分对比、构造格架及原型盆地的性质认识一直存在着争议。从现今大地构造位置上看,准噶尔古板块位于哈萨克斯坦古板块、西伯利亚古板块及塔里木古板块的交接部位。但在古生代的大部分时间里,各板块之间被大洋隔开,准噶尔板块向四周各板块之下俯冲,中间为结晶基底,四周为被动大陆边缘。大约在石炭纪末期,各板块相互拼合成一 The Junggar Basin is a large inland oil and gas bearing basin in the western part of China. It has several oil-bearing formations, especially the Permian. It is not only the main source rock of the basin but also an important oil-bearing formation in the basin. Meanwhile, the structural framework of the Upper Carboniferous and Permian also controlled the tectonic framework and evolution of the Late Junggar Basin. However, for a long time, there has been controversy over the division of the Upper Carboniferous and Permian basins, the tectonic framework and the nature of prototype basins. From the current tectonic location, the Junggar ancient plate is located in the old plate of Kazakhstan, the ancient plate of Siberia and Tarim ancient plate intersection. However, during most of the Paleozoic period, the plates were separated by the ocean. The Junggar plate subducted beneath the plates, with the crystalline basement in the middle and the passive continental margin on the periphery. At about the end of the Carboniferous, the plates merged into one another