Abstract
Kimachi sandstone is widely used as a standard specimen in rock mechanics field, especially on elucidation of hydromechanical characteristics of rock specimen. In this article, we report mainly the pore structure of intact Kimachi sandstone. Total porosity and pore size distribution obtained with mercury intrusion porosimertry were introduced as a basic information of pore structure. Their distribution were characterized as dominant bimodal distribution less than 1 μm. We showed the original μ focus CT data and an example of medial axis analysis for intact Kimachi sandstone. We verified medial axis distributions, connecting path and tortuosity distributions for three perpendicular directions as 3 dimensional geometric information. These information are rather useful for estimating the underground conditions, and evaluating permeability change induced by stress change and so on.
