0542 CO_2地中貯留固定化に関連した岩石のCO_2収着量に関する評価(S52-2 温室効果ガス排出抑制技術(2),S52 温室効果ガス排出抑制技術)

概要

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Anthropogenic effects on the climate can be mitigated through various artificial measures. Amongst others CO_2 sequestration on geological reservoirs including deep saline aquifers, depleted oil/gas reservoirs, and coal seams is expected to provide a powerful means for drastically reducing emissions of CO_2 to the atmospheric. It may be an important step to understand the capacity of the host reservoir rock for CO_2 storage in order to assess the potential of CO_2 geological sequestration. In this study, CO_2 sorption capacity of rocks (granite, sandstone and natural quartz) under air dry condition was evaluated experimentally at temperatures of 50 and 100℃, and pressures up to 20MPa using a magnetic suspension balance (MSB), which allows us to measure the rock weight under the presence of supercritical CO_2. The CO_2 sorption isotherms of the rocks obtained showed that the CO_2 sorption capacity increased with the increasing pressure and decreased with the increasing temperature. Especially, the CO_2 sorption isotherms of the natural quartz were nearly the same as that of the granite. The present experimental results obtained from the weight measurements suggest that the sorption of CO_2 onto silica minerals may be the important mechanism for the CO_2 storage in reservoir rocks.
社団法人日本機械学会の論文
2007-09-07