Abstract
Laboratory Measurements on Gas Permeability and P-wave Velocity in Two Porous Sandstones During CO2 Flooding
Journal of the Mining and Materials Processing Institute of Japan, 120,
2, 91-98, 2004.
Xue Ziqiu, Ohsumi Takashi
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 sandstoneCas 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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