SEGJ Technical Conference

Repeated DC resistivity and AMT measurements of small-scale carbon dioxide gas injection experiment, Horonobe, Hokkaido

Abstract Quantitative estimation of the injected carbon dioxide (CO2) is important not only in the CO2 monitoring but also in the accountability of the management. Seismic monitoring is often used in the CO2 geological storage because the injected CO2 plume can be detected by the movement of the acoustic impedance boundaries. On the other hand, the use of electrical and electromagnetic resistivity prospecting is expected as one of the monitoring approaches because resistivity is sensitive to changes of water and CO2 contents in rocks and soils. Moreover it may be useful for presumption of the storage volume of CO2 since resistivity is strongly correlated with water and CO2 saturations. For more exact CO2 monitoring, therefore, it is effective to carry out seismic and resistivity surveys simultaneously and to conduct an integrated analysis. In order to confirm it, we repeated DC resistivity and AMT measurements with seismic surveys during a small-scale CO2 gas injection experiment, Horonobe, Hokkaido. In this paper, we describe the results of DC resistivity and AMT surveys.