鄂尔多斯盆地延安地区山2段储层特征及其主控因素

采用储层物性分析、扫描电镜、铸体薄片及高压压汞等实验技术,对部尔多斯盆地延安地区山2段储层岩心样品进行分析、测试,研究其储层基本特征,分析有利储层发育的主控因素.研究表明,鄂尔多斯盆地延安地区山2段储层属特低孔、低渗储层,但局部发育有物性相对较好的有利储层,其孔隙度在6.2%-13.2%,渗透率在(0.1-45)x10...

Reservoir characteristics and main controlling factors of P1s2 member in Yan'an Area,Ordos Basin

On the basis of the laboratory techniques of reservoir property analysis,SEM,cast thin section,high pressure mercury penetration,the core samples of P1s2 reservoir in Yan′an Area,Ordos Basin are analyzed.This paper discusses the basic reservoir characteristics and describes the major controlling factors of reservoir development.Study results show that P1s2 reservoir in Yan′an Area belongs to especially low porosity and low permeability reservoir and the reservoir with good physical property developed partially.The porosity is 6.2%-13.2% in partial area and the permeability is 0.1-45 md.The formation and distribution of favorable reservoir are controlled mainly by sedimentary microfacies and diagenesis.The underwater distributary channel and mouth bar sedimentary microfacies control the distribution of favorable reservoir.Strong siliceous cementation and denudation promote the preservation of primary pore of reservoir and the formation of secondary pore.The comprehensive analysis result shows that the favorable reservoirs developed mainly in the sand body of underwater distributary channel and mouth bar in the well areas of Y120,Y121,Y127,Y161,Y162,Y169 and YQ2.