Abstract Geophysical Monitoring for Carbon Dioxide Capture and Storage-Case of Nagaoka CO2 Injection Site in Japan
The Contribution of Geosciences to Human Security, Chapter 6, 87-102 .
Toshifumi Matsuoka, Ziqiu Xue

Geophysical monitoring of CO2 distribution into a deep aquifer plays a central role for CCS(Carbon Dioxide Capture and Storage)technology. Because of the heterogeneity of the underground geology, injected CO2 does not spread simply in underground strata and it is indispensable to identify the area of CO2 distribution and for convincing society to accept CCS. In Japan, the Nagaoka CCS project started in 2000 with the pre-injection phase and CO2 injection phase started in July 2002 and it terminated in January 2005. During this injection phase, the total 10,400 tons of CO2 were injected at Haizume Formation at about 1,100 m deep aquifer. During this injection phase and also the post-injection phase(after 2005), many geophysical monitoring techniques have been conducted such as time-lapse well logging, cross-well seismic tomography, and 3D reflection seismic survey. Applying these monitoring methods, the CO2 distribution at Nagaoka CCS project is clearly delineated.

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