Abstract
Laboratory experiments were conducted to measure compressional wave velocities under hydrostatic pressure in Shirahama and Tako sandstone with a porosity of 12 and 24%, respectively. In dry samples under hydrostatic pressure, the compressional wave velocity increased significantly in Shirahama sandstone, as a result of the closure of micropores with low aspect ratio, while the velocity in Tako sandstone was less affected. The pressure dependence of velocity is ascribed to the difference in micropore structure. Velocities were also measured to map the movement of the injected CO 2 within a water-flooded sample during CO 2 flooding. In the water-flooded sample, velocity changes caused by the CO 2 flooding, provided at the bottom end of the sample, are typically on the order of −6%. The compressional wave velocities decreased simultaneously along horizontal paths in two orthogonal directions.
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