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| | Abstract | | The time domain electromagnetic methods will be effective to estimate the status of underground CO2 since the interaction between CO2 and a saline aquifer may cause some change in resistivities. In this study, electromagnetic responses of CO2 reservoir are simulated by the finite difference method. We introduce the three-dimensional resistivity models utilizing the data on the preliminary survey of CO2 sequestration in Tomakomai. During the injection, consequently, the measurement of horizontal magnetic components is found to be more effective than that of vertical components to capture spreading CO2. Moreover, the calculation of the post-injection implicates that the electromagnetic responses are more sensitive to the change in resistivity of CO2 than that in volume. |
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