Geochemical trapping of CO2 in saline aquifer storage: Results of repeated formation fluid sampling at the Nagaoka site

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. (c) 2013 The Authors. Published by Elsevier Ltd.