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.