论低渗透储层的分类与评价标准——以鄂尔多斯盆地为例

The classification and evaluation criterion of low permeability reservoir:An example from Ordos Basin

根据鄂尔多斯盆地三叠系储层300余块压汞样品、260余块铸体及100余块图像孔隙分析结果,参考前人关于碎屑岩储层特别是低渗透储层的划分标准,文章将低渗透砂岩储集层分为4类4个亚类,4类即低渗透层(Ⅰ类)、特低渗透层(Ⅱ类)、超低渗透层(Ⅲ类)、致密层(Ⅳ类),其中特低渗透层和超低渗透层是鄂尔多斯盆地三叠系延长组的主要储层类型,故又根据孔隙结构特征、物性特征以及油层厚度的常用划分标准等将二者各细分为2个亚类。

Based on the mercury penetration analysis of more than 300 samples and analysis results of more than 260 casts and more than 100 image pores,and referred to the classification criterion about clastic reservoir,especially low permeability reservoir,the low permeability sandstone reservoirs in Ordos Basin were divided into four types and four sub-types.The four types include low permeability reservoir（I）,extra-low permeability reservoir（II）,super-low permeability reservoir（III）and tight reservoir（IV）.Among them extra-low permeability reservoir and super-low permeability reservoir are the main reservoir types of Triassic Yanchang Formation in Ordos Basin.According to the characteristics of the pore structure and petrophysics and the classification criterion of the reservoir thickness,they are divided into two sub-types respectively.