Abstract
In this paper, we evaluate CO2 geochemical trapping mechanisms in a sandstone reservoir at Nagaoka, Japan, where the first Japanese pilot project for CO2 geological storage is underway. CO2 injection was conducted at a depth of approximately 1100 m from July 2003 to January 2005, and a total amount of 10,400 tons of CO2 was injected. More than seven years have now passed since post-injection monitoring was started. In September 2011 a second CHDT sampling was performed. Fluid sampling results from this showed that the proportion of solubility trapping increased and the potential for mineral trapping was indicated.
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