SEISMIC WAVE VELOCITY MONITORING OF CO2 MIGRATION IN POROUS SANDSTONES SATURATED WITH WATER
利用弹性波检测多孔质饱和砂岩中的二氧化碳流动状态

Laboratory experiments were conducted to measure the compressional wave velocities under hydrostatic pressure in Shirahama and Tako sandstones with a porosity of 12% and 24%,respectively. In dry samples,the pressure dependence of velocity is ascribed to the difference in pore structures. Velocities were also measured to map the movement of the injected CO2 within water-saturated samples during CO2 injection. In the water-saturated samples, velocity changes caused by the CO2 injection are typically on the order of 10%. A series of seismic tomography experiments are conducted on porous sandstone samples to demonstrate the use of cross-well seismic profiling for monitoring the migration of CO2 in geological sequestration projects.