Abstract
Abstract For the practical application of deep geological CO 2 sequestration in Japan, it is necessary to assure the safety of the sequestration method and technology to achieve public acceptance. For this purpose, it is also necessary to carry out risk assessments and scenario analysis taking into account typical Japanese geological conditions. A scenario analysis procedure was evaluated by using hypothetical geological information reflecting the actual geology in Japan. A new FEP database (RITE-DB) was created for application to Japanese geology because Japan has complicated geological structures which include folds, faults and fractures. FEPs are features, events and processes that are relevant to the long-term safety and performance of the sequestration system after injection of CO 2 . The scenario analysis with the RITE-DB identified important scenarios, i.e. a fault scenario, a seal failure scenario, etc. and many phenomena sequences in these scenarios. The process of identifying the scenarios and phenomena was judged to be exhaustive. The results will inform quantitative safety analysis and site design.
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