Seismic wave monitoring of CO₂migration in water-saturated porous sandstone

Petrophysical analysis to investigate the effects of carbon dioxide storage in a subsurface saline aquifer at Ketzin, Germany (CO2SINK)

“…636 km/s. Xue and Ohsumi (2004) reported, that the P-wave velocity decreases by about 4.3 to 6.5% of the initial velocity after injection of gaseous CO 2 into a water saturated sandstone. The impact of the CO 2 on velocity is smaller in our experiment, which is probably due to a partial displacement of brine and high residual water saturation.…”

Seismic Monitoring in the Framework of the Pilot Project CLEAN

“…In a further test a leakage was implemented in model A with P-and S-wave velocity changes of -4% at 2045 m depth. High changes like this are realistic, when formation water is present (Xue and Ohsumi, 2004). This leakage zone is very small with an extension of only 30 m and a thickness of 15 m ( fig.…”

A Method For Detecting Displacement Front Based On Ultrasonic Velocity

“…CO2 drive. At last, supercritical CO2 (CO2 has a critical temperature and pressure of 31°C and 7.4MPa [10] [11].) was injected into the core sample to drive the oil out.…”