关键词: 准噶尔盆地, 前陆盆地, 构造演化, 前陆冲断带, 勘探方向

Abstract: Junggar basin is regarded as a large-scale composite basin superimposed by intracontinental and foreland basins. Since Carboniferous era, it underwent the processes of three-period expanding and thermal subsiding, developing three series of source rocks. In its three-period foreland basins shaped a series of structural belts, developing three vital stages for hydrocarbon accumulation. It was the multi- superimposition that formed such three foreland thrust belts as the northwestern margin, the southern margin and the northeastern margin of Junggar basin, of which the overthrust fault belt in the northwestern margin was already by the proof a large-scale oil-gas accumulation belt; the large- and middle-scale oil-gas fields in thrust fold belt of the southern margin are being found one after another, and the foreland thrust belt in the northeastern margin has appeared better and better exploration prospects. The prospecting practices indicate that this foreland thrust belt in northeastern margin of Junggar basin has a great deal of explorative potentials with obvious realms and clear targets, being an important domain for the incremental reserves and productions in Junggar basin.

Key words: Junggar basin, foreland basin, structural evolution, foreland thrust belt, explorative direction, exploration target