Abstract
Laboratory experiment has been conducted to measure resistivity and P-wave velocity simultaneously when injecting CO2 in water-saturated sandstone. The rock sample was cylindrical Berea sandstone, and CO2 was injected in supercritical condition (10MPa, 40°C). The experimental results showed that resistivity increased monotonously throughout the injection period, and P-wave velocity decreased drastically after starting injection of supercritical CO2. Reconstructed P-wave velocity images obtained by the differential arrive-time method clearly show CO2 migration when resistivity increases and velocity reduces. Resistivity and seismic velocity are useful to monitor CO2 behaviors. P-wave velocity becomes less sensitive when CO2 saturation up to 20%, while resistivity kept increasing with increase of CO2 saturation.
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