贺西地区是我国几大板块的交汇处，多期 的构造运动致使该区构造特征极其复杂，同时形成了不同类型的众 多盆地。该区古生代以来的板块运动，使不同大地构造环境具有五种不同的沉积基底，伴之以形成五种类型的沉积 盆地。不同类型盆地构造特征与沉积演化差异很大，油气勘探前景亦不同。石炭—二叠时期，本区东部的巴彦浩特、武威、定西等盆地接受了一套厚度较大的海相到海陆交互相沉积，烃源岩厚度大、品质好，具有良好的油气勘探前景。侏罗系在本区形 成三个沉降带，勘探实践中已找到一批小型油气藏，预示着侏罗系是本区重要的勘探层系。白垩系是本区勘探程度 最高、油气资源丰度最高、找到油气储量最多的层系，深挖细找仍具很大潜力。贺西地区油气分布规律是：新生界以背斜构造油 藏为主，中生界以隐蔽油气藏为主，古生界以断块潜山油气藏为主 The Hexi area is the intersection of several major plates in our country. The multi-period tectonic movement has made the tectonic features of this area extremely complicated and formed many different types of basins. Plate movement since the Paleozoic in this area has resulted in five different sedimentary basins in different tectonic settings accompanied by the formation of five types of sedimentary basins. Different types of basins have great differences in tectonic features and sedimentary evolution, and have different prospect of oil and gas exploration. During the Carboniferous-Permian period, the basins of Bayanhot, Wuwei, and Dingxi in the eastern part of this area have accepted a set of thick marine to intercontinental sediments. The source rock is thick, of good quality and has good prospect of oil and gas exploration . The Jurassic formed three subsidence zones in this area. A number of small oil and gas reservoirs have been found in the exploration practice, which indicates that Jurassic is an important exploration strata in this area. Cretaceous is the highest degree of exploration in this area, the highest oil and gas resource abundance, to find the most oil and gas reservoir layer, digging still has great potential. The distribution pattern of oil and gas in Hexi area is that the Cenozoic mainly consists of an anticline tectonic reservoir, the Mesozoic mainly consists of subtle reservoirs, and the Paleozoic is mainly fault block buried hill reservoirs