喜马拉雅运动与准噶尔盆地南缘油气成藏

喜马拉雅运动期源自特提斯构造域的强大挤压应力使北天山快速、大幅度隆升,并向盆地冲断,在盆地南缘发育了陆内造山型类前陆坳陷。喜马拉雅运动控制着准噶尔盆地油气晚期成藏:快速沉积的巨厚磨拉石建造使中、新生界烃源层在南缘山前坳陷中成熟排烃;在盆地南缘形成了喜马拉雅运动期成排成带的背斜构造,在盆地北部形成了一些平缓的低幅度背斜构造,为晚期油气成藏提供了有利场所;喜马拉雅运动在全盆地强化了断裂的运移通道作用。

Relationship between Himalayan Movement and Hydrocarbon Accumulation in Southern Margin of Junggar Basin

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 accumulations in Junggar basin. It is concluded that quick deposition of huge thickness of molasse formation brings the source 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.