[H-RE31_2AM2] 地球温暖化防止と地学（CO2貯留・利用,CO2-EOR,地球工学）

[HRE31-10] CO₂貯留層を模した条件下におけるドーソナイトの合成・溶解実験

高谷 雄太郎¹、*中村 謙太郎²、加藤 泰浩¹ (1.東京大学大学院工学系研究科エネルギー・資源フロンティアセンター、2.東京大学大学院工学系研究科システム創成学専攻)

キーワード：CO₂地中貯留, 鉱物トラッピング, ドーソナイト

Geochemical trapping is a mechanism for defining the longer-term security of CO₂ underground storage. Especially, mineral trapping improves the storage security by the transformation reaction of injected CO₂ (liquid or supercritical phase) to carbonate minerals. Recently, several studies based on the computer simulation predicted the formations of dawsonite (NaAlCO₃ (OH) ₂) as an initial phase of mineral trapping and that dawsonite may play important role for the storage security in the early stage of CO₂ storage. However, it has not been reported the formation of dawsonite in the experiments under the relevant condition of the CO₂ underground storage to date and the problem ''whether dawsonite will be formed in the CO₂ reservoir and will contribute the improvement of the CO₂ storage security'' is still remaining. In this study, therefore, we conduct the synthesis/dissolution experiments of dawsonite under the CO₂ reservoir condition and discuss the formation/preservation condition of dawsonite. We further discuss the possibility of dawsonite formation in the CO₂ reservoir based on our experimental results.