摘要
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 structure characteristic of the low permeable sandstone ore rock as well as the influence of the structure on the penetration ratio, this paper based on the mercury intrusion experiment to analyze the fractal characteristics of the pore and pore specific surface distribution in the low permeable sandstone uranium rock, and study the relation between the structure characteristic and porosity. The study indicates that there are double-fractal characteristics of the structure in the low permeable sandstone uranium rock, it mainly shows the fractal dimension value of the pore distribution and pore specific surface distribution is different with the pore of small and large aperture. The fractal dimension of the pore distribution with the large aperture ranges from 3.687 to 4.255, while that with the small aperture ranges from 3.101 to 3.208. And, the fractal dimension of the pore specific surface distribution with the big particle mass ranges from 2.910 to 3.151, and that with the small aperture ranges from 2.466 to 2.342, and that the relation between the porosity and the fractal dimension of the large aperture is positive correlation, but is negative correlation between the porosity and the fractal dimension of the pore specific surface distribution in the large aperture.
出处
《核技术》
CAS
CSCD
北大核心
2013年第1期37-42,共6页
Nuclear Techniques
基金
国家自然科学基金项目(50874063
91026015)
湖南省教育厅优秀青年项目(12B111)资助
关键词
渗透砂岩铀矿
孔隙结构特征
压汞实验
分形维数
Low seepage sandstone uranium ore rock, Pore structure characteristics, Mercury intrusion method,Fractal dimension
