关键词: 弧形构造带, 阿尔金, 基岩断裂, 柴达木盆地, 深断裂, 基岩隆起, 中生代, 地壳运动, 同生构造, 油藏类型

Abstract: There are six Aerjin arcuate structural zones inside the Chaidamu(Tsadam) Basin formed along the deep Aerjin fault under the horizontal compression of the Indian plate by shearing and tractive forces.Taken together,they constitute a composite trinitarian structural zone of three features:basement fault,basement uplift and overburden anticline,with the latter two being controlled by the first one.Thus,it leads to the belief that the said basin is an overburden structure controlled by basement faulting.These arcuate structural zones of Meso-Cenozoic ages were formed since the Mesozoic as a result of three stages of plate collision and four major crustal movements,particularly the uninterrupted uplifting since Miocene.The development of these arcuate structural zones accompanied and controlled the formation and shifting of the three major oil regions in the basin from north to south and from west to east.They form a contemporaneous composite structural zone favourable for accumulation of oil and gas and formation of many types of oil pools.The positive drag structures are most favourable for oil occurrence on the arcuate structural zones.The most promising approach for exploration of oil and gas in the basin is to locate structures along the faults.