Abstract 二酸化炭素注入に伴う多孔質砂岩の透気係数と弾性派速度の測定に関する実験的研究
Laboratory  Measurements on Gas Permeability and P-wave Velocity in Two Porous Sandstones During CO2 Flooding
資源と素材, 120, 2, 91-98, 2004.
薛 自求, 大隅 多加志

Laboratory experiments were conducted to measure gas permeability and P-wave velocity under hydrostatic pressure in Shirahama and Tako sandstones with porosity of 12％ and 24％, respectively. In dry samples, gas permeability and P-wave velocity were significantly changed with increasing hydrostatic pressure in Shirahama sandstone，as a result of the closure of micropores with low aspect ratio, while in Tako sandstone they were less affected. In water-saturated sample, velocity changes caused by CO2 injection, are typically on the order of -6%. P-wave velocities decreased almost simultaneously along horizontal paths in two orthogonal directions. Results of P-wave velocity tomography suggested that cross-well seismic profiling is useful to monitor migrations of the
lnjected CO2 in geological sequestration sites.

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