低孔渗砂岩孔隙结构分类方法研究

Study on Pore Structure Classification of Low Porosity and Permeability Sandstone

低孔渗砂岩储层孔隙结构复杂,在二维与三维空间中具有较强非均质性,对储集空间的测井响应有极大影响。而压汞曲线、核磁T_2谱、铸体薄片3种资料在一定程度上各自反映了孔隙结构的不同特征,本文分别提取3种资料的微观孔隙结构参数进行相关性分析,最终分别利用主成分分析-模糊均值聚类方法实现孔隙结构分类,其分类结果压汞曲线分形法所得一致。

The pore structure of the low permeability sandstone reservoir is complex and has strong heterogeneity in two-dimensional and three-dimensional space, and it has a dramatic effect on logging response of reservoir. However, the mercury intrusion curves, NMR T2 specmma and thin section three kinds of data each reflects the different characteristics of the pore structure in some way. In this paper, the microscopic pore structure parameters of three kinds of data were extracted for correlation analysis, finally, pore structure classification was achieved respectively by PCA-FCM, and the classification result is consistent with the mercury intrusion curve fractal method.