Abstract Saline-aquifer CO2 sequestration in Japan-methodology of storage capacity assessment
International Journal of Greenhouse Gas Control, 5, 2, 318-326, 2011.
Ogawa Toyokazu, Nakanishi Shigetaka, Shidahara Takumi, Okumura Tadahiko, Hayashi Eiji

A nationwide saline-aquifer CO2 storage capacity assessment has been carried out in Japan in
two missions: In Mission 1, candidate saline aquifers were classified in terms of the type of
geological structure and the amount of data available. Storage capacity for the entire country was
then estimated based upon oil and gas exploration data (146 billion tons of CO2). The areas
considered in the Mission were located mostly offshore and far from large CO2 emission sources.
Mission 2 involved storage capacity estimation in 27 areas in the vicinity of large CO2 emission
sources. These areas had been excluded in the Mission 1 capacity assessments. With nationalscale
geological survey results, a preliminary assessment was performed, and promising
sedimentary regions were selected for more detailed examination. To date the overall storage
capacity is still under discussion in Mission 2, whereas a systematic way of evaluating data
quality and quantity is proposed, and comparative studies on the storage capacity estimation is in
progress.

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