Influence of Fault on the Anisotropy of Pore Structure and Permeability in Granite, Tono Area, Central Japan

; Uehara, Shinichi*; *; *

American Geophysical Union 2002 Fall Meeting, p.F1371 - F1372, 2002/12

The effect of micro-cracks on the transport properties of granite is studied using laser scanning microscope. 3D images of pore structure show the influence on the porosity and permeability. Anisotropy of micro-cracks are observed on two different directions in respect to the main structure. Results on permeability show a decreases by a factor of one to two order of magnitude in the direction parallel to the fault zone. In the conference will be discussed the implications of anisotropy of micro-cracks on the transport properties in crystalline rocks.