准噶尔盆地车-莫古隆起构造特征及物理模拟

依据盆山耦合思想、最新地震解释数据对准噶尔盆地腹部车-莫古隆起的规模和性质进行了构造解析;根据古隆起的构造特征设计平面实验,对其主要发育过程进行了一组相似性尺度物理模拟。综合结果表明:(1)盆地北部受阿尔泰褶皱山系影响,沿陆南-滴水泉断裂带一线存在一条隐伏走滑断裂,其在侏罗纪活动时于浅层形成以陆北断裂和夏盐1井、石南、滴水泉断裂为边界的右旋走滑断裂带;其与盆地南缘边界压扭性断裂带整体上构成左阶右行式断裂组合,且均为深大断裂;(2)走滑边界对于其内部的断块变形具有调整改造作用,车-莫古隆起是受盆地南北两侧的两条右旋压扭性走滑断裂带的夹持下斜向挤压而形成的;(3)侏罗纪末古隆起分布北部达三个泉凸起的北缘,东北部达陆南凸起南缘,西北部边界可达克-夏断阶带东缘,西南部越过红车断裂带抵车排子凸起西部,包含车排子凸起在内,整体为"S"形。

PHYSICAL MODELING OF DEFORMATION FOR THE CHE-MO PALEO-UPLIFT, JUNGGAR BASIN

From the basin-orogen coupling viewpoint,the scope and characteristics of the Che-Mo paleo-uplift in the hinterland of the Junggar Basin are explained based on the latest seismic data.Its physical modeling of the developing processes is conducted on a group of comparable scales according to the plane sandbox experiment simulating the tectonic characteristics.The results suggest that:1)It was influenced by the Altay fold system,a concealed strike-slip fault in the north of the basin occurred along the Lunan-Dishuiquan fault belt,rejuvenated in the Jurassic and changed to dextrorotation strike-slip fault in the shallow layer,bordered along the Lunan rupture,Xiayan No.1 well,Shinan,and Dishuiquan rupture.The strike-slip fault merged into the southern basin boundary ruptures,and formed a deep steep fault.2)The strike-slip border adjusted and altered the shape of its inner blocks,and the Che-Mo paleo-uplift formed under the tilted extrusion between the two dextrorotation strike-slip compresso-twist faults in north and south of the basin.3)The paleo-uplift presented a "S" shape in geometry consisting of the Chepaizi uplift,bordered in turn by the northern edge of the Three Springs uplift,the southern Lunan uplift,the eastern Ke-Xia rupture,and to the southwest across the Hongche rupture system by the western Chepaizi uplift.