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准噶尔盆地是我国西部含油气区的一个大型叠合盆地。它叠合了中、晚元古代陆表海盆地,古生代早、中期的被动型大陆边缘的冒地斜盆地,晚古生代的碰撞前陆—碰撞山前盆地,中生代—老第三纪的碰撞山前盆地,新生代晚期的碰撞复活山前盆地,以及晚古生代—中生代的盆地中部大陆裂谷盆地。叠合面积14.5万平方公里,叠合沉积岩最大厚度达12—15公里。盆地西北缘、东北缘和南缘都叠合着来自盆地边缘俯冲、碰撞沉降带深部和盆地中部裂谷坳陷区两个方向的数套油源,形成屋脊式油气富集带。此外,盆地中的煤成气资源和过成熟的天然气资源也十分丰富,是我国西部含油气区中油气资源非常丰富的大型叠合盆地,其远景储量有可能超过东部的松辽盆地。
Junggar Basin is a large-scale superimposed basin with petroleum-bearing area in western China. It is a combination of mid-and late Proterozoic land surface sea basins, Paleozoic early and middle Passive continental margins, Late Paleozoic collision foreland-collision forebath, Mesozoic-Oligocene collision foreland basin The Late Paleozoic Precapping Piedmont basin in the late Cenozoic, and the Late Paleozoic-Mesozoic continental rift basin in the Central China. Overlapping area of 145,000 square kilometers, the maximum thickness of superimposed sedimentary up to 12-15 km. In the northwestern margin, the northeastern margin and the southern margin of the basin, several sets of oil reservoirs are superimposed from two directions, ie, the subduction of the basin margin, the deep of the collision subsidence zone and the rift depression in the central basin, forming a ridge-type oil and gas accumulation zone. In addition, the coal-to-gas and over-mature natural gas resources in the basin are also very rich. It is a large-scale superimposed basin rich in oil and gas resources in the western petroleum-bearing area in the western part of China. Its prospective reserves may surpass the Songliao Basin in the east.