通过对野外剖面及岩芯的观察和描述,将鄂尔多斯盆地安塞地区延长组划分出9个岩石相和6个岩石相组合。在建立岩-电模式的基础上,根据测井曲线,对沉积相的电性特征进行了分析。结合岩石相和测井相,分析了安塞地区延长组的沉积相类型及特征,同时对沉积相与油气的关系进行了分析。结果表明,延长组长2油层组为辫状河沉积,长3和长10油层组为曲流河沉积,长9、长7及长4+5油层组为湖相沉积,而长6和长8油层组为三角洲前缘沉积。认为河道砂坝沉积微相及水下分流河道沉积微相为区内良好的储集层,是油气开发的方向。

According to the outcrops observing and the cores describing,Yanchang  formation has been classified 9 petrology facies and 6 petrology facies units. On the basis of establishing the model between petrology and electricity, the types of the electrofacies have been analyzed. Connecting the petrology facies with the electrofacies, the types and the characteristics of the  sedimentary microfacies in Yanchang formation have been studied. It indicated that Chang 2 belong to the braided river facies, Chang 3 and Chang 10 are the  meandering fluvial facies, Chang 9,Chang 7 and Chang 4+5 are lacustrine facies, while Chang 6 and Chang 8 are front-delta facies. The sand bar microfaces and the  distributary channel microfaces are the good reservoir. They led to the directions of oil and gas exploration and development.