繰返し弾性波トモグラフィによる地中貯留二酸化炭素分布の可視化(<特集>地盤構造物の可視化技術の現状と課題)

概要

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Japan's first pilot-scale CO_2 geological sequestration project has been undertaken in Nagaoka. Among various measurements conducted at the site for monitoring the injected CO_2, the authors conducted time-lapse crosswell seismic tomography between two observation wells to determine the distribution of CO_2 in the aquifer as a change of P-wave velocities. The crosswell seismic tomography measurements were carried out seven times. Then, the authors could successfully delineate the injected CO_2 distribution as a velocity reduction area. And, by introducing the formula between CO_2 saturation and seismic velocity from the results of geophysical logging, the authors tried to convert seismic velocity obtained by seismic tomography into CO_2 saturation.
社団法人地盤工学会の論文
2009-05-01