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| | Abstract | | For monitoring of injected CO2 by a change of seismic velocity, it is important to know CO2 distribution states in pore space of underground rocks. Two distribution states, such as uniform and patchy saturation, make a big difference on the seismic velocity even if the CO2 saturation is same. In Nagaoka CO2 sequestration project, CO2 distribution state of target reservoir is predicted to be patchy saturation by well log analysis. However, whether we can observe patchy saturation or not depends on applied seismic wavelength and patchy size in the reservoir. In this paper, we present methodology to derive minimum size which gives patchy saturation, and show a result of calculated patch size in Nagaoka site. |
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