Abstract
Abstract Monitoring is the major challenge in CO 2 geological sequestration. At the first Japanese pilot CO 2 injection site (Nagaoka), CO 2 was injected into a thin permeable zone at a depth of 1100 m and the total amount of injected CO 2 was 10,400 tons during the injection period from July 2003 to January 2005. After ceasing of CO 2 injection, well loggings which mainly consist of neutron logging, sonic logging and induction logging have been continued for 5 years. The Nagaoka site may provide the first field data set of post-injection monitoring and essential information on long-term CO 2 behaviour in a saline aquifer. In this paper reports the results of formation pressure, well logging and fluid sampling aiming to improve understanding of CO 2 long term behaviour in the reservoir. The results of time-laps well logging provide the evidences of the solubility trap and residual trap in progress at Nagaoka, suggesting CO 2 is stored safely in a complex sandstone reservoir.
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