It is found that fractal features are different in different areas, and fractal dimension can be used to describe the heterogeneity of porous structure quantitatively.

• 研究表明孔隙的分形特征是分区域的，分形维数可以定量描述孔隙的非均质性，分形维数大，砂岩孔隙分布的非均质性强。