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| | Abstract | | Monitoring of injected CO2 is required in order to perform the geological storage safely and effectively. Since the porosity is generally is small at depth, the hydraulic characteristics are governed by the fractures in the rocks. Therefore, development of the technique which monitors the behavior of the fluid in a fractured rock is one of the important researches in CO2 geological storage. The use of electrical prospecting is expected as one of the monitoring approaches because resistivity is sensitive to changes of gas and water contents in rocks. An air injection experiment was conducted at the Kamaishi Mine, North Japan, to evaluate the effectiveness of resistivity monitoring for the air and water movements in fractured zones. In this experiment, air was injected by a compressor from the top of the KF-3 well, which was aslant drilled in the fractured rock of a granodiorite at the angle of 15 degrees from the tunnel wall. Resistivity data were collected before, during and after the air injection. This paper reports the result of resistivity monitoring. |
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