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为了研究低渗透性砂岩铀矿含矿岩孔隙结构特征以及对渗透率的影响,采用压汞实验的方法,并根据压汞实验的数据,分析了低渗透性砂岩铀矿岩孔隙以及孔隙比表面分布分形特征。探讨了砂岩铀矿岩孔隙结构特征与孔隙率之间的关系。研究表明,渗透性砂岩铀矿岩结构具有双重分形特征,其表现在以大、小孔径孔隙计算出来的孔隙分布分形维数值与孔隙比表面分布分形维数值不同。大孔径孔隙分布分形维数在3.687–4.255,小孔径孔隙分布分形维数各矿样基本相同为3.101–3.208。而大孔径比表面分布分形维数在2.910–3.151,小孔径比表面分布分形维数各矿样基本相同为2.466–2.342。孔隙率与大孔径计算孔隙分维值成正相关关系,与以大孔径计算的孔隙比表面分维值成负相关关系。
In order to study the characteristics of pore structure and the influence on permeability of ore-bearing rocks in low permeability sandstone uranium deposits, the mercury intrusion porosities of low permeability sandstone uranium ore rock and pore specific surface Distribution fractal features. The relationship between pore structure and porosity of sandstone uranium ore is discussed. The results show that the permeability of fractured sandstone uranium ore rock has a double fractal characteristic. The fractal dimension value of pore distribution calculated by large and small pore diameters is different from the pore size distribution fractal dimension value. The fractal dimension of the pore distribution of the large aperture is in the range of 3.687-4.255, and the fractal dimension of the pore distribution of the small pore is basically the same with each mineral sample being 3.101-3.208. While the fractal dimension of the large aperture specific surface distribution is 2.910-3.151. The fractal dimensions of the small aperture specific surface distribution are basically the same with the same fractal dimensions of 2.466-2.342. Porosity has a positive correlation with fractal dimension of macropore, and has a negative correlation with fractal dimension of macropore.