鄂尔多斯盆地东部山1段是天然气开发的重要层位之一,该储层非均质性较强,勘探难度较大,进行储层特征研究及评价对山1段储层的勘探开发意义重大.运用铸体薄片鉴定、扫描电镜、X-衍射及高压压汞等测试方法,系统研究了鄂尔多斯盆地东部山1段砂岩储层的岩石学特征、孔隙结构特征、物性特征;根据物性特征、微观孔隙结构特征等并结合前人研究,对研究区山1段储层进行了分类评价.结果表明:研究区山1段储层的填隙物主要以伊利石、高岭石、硅质、碳酸盐为主,还有少量的泥质、绿泥石及菱铁矿等;孔隙类型主要为次生孔隙,包括粒内溶孔及粒间溶孔、晶间孔、微裂隙;研究区山1段以Ⅱ、Ⅲ类储层为主,属于低孔低渗致密砂岩储层.研究结果对有利储层勘探具有指导意义.%The Shan 1 member reservoir in the eastern Ordos Basin is one of the important layers fornatural gas development, reservoir here has strong heterogeneity and is difficult to be explored.So, making a research on reservoir characteristics and reservoir evaluation is of great significance for its exploring and developing.Petrological characteristics, pore structure characteristics, physical properity characteristics are analyzed based on thin sections, SEM, X-ray diffraction and high pressure mercury injection, and the evaluation of Shan1 member reservoir also has been discussed respectively.The results show that, the main cement of Shan 1 member reservoir in the study area is given priority to with illite, kaolinite, silica, carbonate, and also a small amount of mud, chlorite and siderite and so on.Secondary porosities are the main pore type including intragranular pore, intergranular pore, intercrystalline pore and micro fracture.The characteristics of reservoir physical property and reservoir micro pore structure, combined with previous studies, study of reservoir evaluation and classification has also been carried out.It shows that the Shan 1 member in the study area is divided in to class Ⅰ,Ⅱ,Ⅲ reservoir and class IV non-reservoir.The Ⅱ, Ⅲ class reservoirs are dominant, which belong to low porosity and low permeability tight sandstone reservoir.The results of this study have guiding significance for the exploration of favorable reservoirs.
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