Abstract
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 injected CO2 in geological sequestration sites.
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