鄂尔多斯盆地奥陶系沉积时期处于“三隆二鞍一坳陷”的古构造格局,3个隆起共同控制着奥陶系的沉积体系,同时也控制着有利储层的最初展布状态。奥陶系沉积之后,鄂尔多斯盆地经历了长达1.3亿年的沉积间断,形成了广泛发育的风化壳岩溶储层。本溪期-早中三叠世,奥陶系顶面始终处于“中部隆、东西坳”的构造面貌,在中部隆起与东部坳陷之间存在一陡坡带,这一陡坡带对岩溶储层的后期演化具有决定性作用。晚三叠世,奥陶系顶面处于西北高、东南低的构造格局,最初生成的油气向盆地西北方向运移。中侏罗世,盆地东部逐步抬升,奥陶系顶面构造格局主要表现为东部高、西部低,生成的油气主要向盆地东部运移,早期生成的油气进行重新调整。

The palaeo-structrual pattern of Ordovician are three uplifts and two neks and one depress in Ordos basin.Three uplifts control together sedimentary system of Ordovician,at the same time control the development of the original reservoir.After sedimentary of Ordovician,sedimentary are interrupted about a hundred million years,karst reservoir developed widely.From benxi formation to middle Trias,the up-and-down configurations of Ordovician weathered crust peak are very steady,namely high in the middle and  bellow in the east. There are a abrupt slop e between uplift and depress, it is important to evolution of karst reservoir. L ate trias, the up-and-down configurations of Ordovician weathered crust peak a re high on the west-north and low on the east-south, oil-gas moved to west-n orth. The middle Jurassic, the up-and-down configurations of Ordovician weathe red crust peak are high on the east and low on the west, oil-gas adjusted again , moved to east.