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| | Abstract | | We conducted to monitor the fluid behavior in four types of rocks by using electrical impedance (Z) under high-pressure conditions (20 MPa for confining pressure). Two brine-saturated sandstones are injected super critical CO2. In this case, Z clearly increases with changing CO2 injection rate. We also use two artificial cracked rocks, granite and pyroxene-andesite, they are saturated by Nitrogen the initial condition. We injected brine to these samples and measure the Z. The quartz-andesite shows Z-reduction with increasing brine pressure. However, the granite does not show the change of Z. These Z-changes reflect the variation of water saturation. |
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