Abstract: Erlian Basin is a Mesozoic continentians basin developed on the Hersian folding basement.Lower Cretaceous Aershan and Tenggeer Groups and Jurassic formations are the main deposits.Sags in the basin and distributed en lunchen showing the characteristics of action of tensional and torsional force during their formation.Affected by factors such as the structural lines of the basement,boundary conditions and the nonuniformity of the action of the geological forces,the depth of depressions as well as their sizes differ greatly,and show a feature of sectioning and belting distri-bution.Strong tensional and torsional depressions are formed mainly along overlapped areas of NNE-NE and nearly E-W of the basement structural lines,the former depressions being large and deep usually,and the later ones being narrow and shallow.The size of tensional depressions developed on the base of NE-NNE basement sructural lines in the nothern part are greater than those deve-loped on the E-w structural lines in the southern part.As a result of exploratory drilling,5 types of oil reservoirs are discovered.All of them are located in the tensional depression zone.The oil in them being origin-ated from lower cretaceous accounts for 80% of the predicted resources.All the oil and gas are find on the area surrounding the oil-generation sags.However,strong reforming action due to later tectonic movement were occured.Jurassic oil and reservoirs and coaliferous gas reservoirs may be found as more exploration is carried.

摘要： 二连盆地是在海西期褶皱基底上发育起来的中生代陆相断陷盆地,其沉积主体为下白垩统阿尔善组、腾格尔组及侏罗系。盆地内凹陷呈雁行状排列,表现出断陷期拉张剪切运动的特点。受基底构造线、边界条件及受力不均一性等因素影响,盆地内断陷深度和规模有显著差异,平面上具明显的分段性和分带性,分别形成了以强烈拉张和剪切为主的断陷区,前者分布的凹陷一般大而深,后者窄而浅。在北东—北北东向基底构造线上发育起来的北部坳陷带的拉张断陷,规模大于主体重叠在近东西向构造线上的南部坳陷带。钻探已发现5种油藏类型,均位于强烈拉张断陷区,油源来自下白垩统,约控制盆地已知油气资源量的80%。油气分布围绕着生油洼陷,但后期构造运动的改造作用较大。随勘探工作深入,可能发现中下侏罗统自生油气藏及煤成气等类型的天然气藏。