关键词: 准噶尔盆地, 构造, 喜马拉雅运动, 油气藏形成

Abstract: Himalayan movement originated from powerful compressive stress in Tethys tectonic domain, which caused north Tianshan mountains to quick and extensive uplift and thrusting toward Junggar basin followed by shaping foreland depression of intracontinental orogenic type developed in the southern margin of Junggar basin. It is Himalayan movement that controls the late hydrocarbon accumula- tions in Junggar basin. It is concluded that quick deposition of huge thickness of molasse formation brings the sonrce rocks of Mesozoic and Cenozoic into maturity stage and hydrocarbon expulsion in the foreland depression of this southern margin where forms the anticlinal structures in row and belt in the episode of Himalayan movement and some gentle or low-amplitude arch structures in northern Junggar basin. They provide favorable sites for such late hydrocarbon accumulations. Also, the faults as channels for petroleum migration in the whole basin have been intensified by the Himalayan movement.

Key words: Junggar basin, southern margin, Himalayan movement, hydrocarbon accumulation