The Effect of deformation on permeability and porosity of the Neogene sedimentary rocks in the Horonobe area, northern Hokkaido, Japan

Okazaki, Keishi*; Shimamoto, Toshihiko*; Uehara, Shinichi*; Niizato, Tadafumi  

Permeability and porosity are essential physical properties for analyzing of underground fluid flow. We have examined the effect of deformation on permeability and porosity of the Neogene sedimentary rocks (Yuchi, Koetoi, and Wakkanai Formations in the descending order) by laboratory experiments. Wakkanai Formation can be fluid conduit due to deformation, whereas Yuchi and Koetoi Formations do not necessarily become fluid-flow passes even with deformation. The deepest part of Koetoi Formation seems to have the highest seal capacity among the three formations.