Reactive transport simulation study of geochemical CO2 trapping on the Tokyo Bay model – With focus on the behavior of dawsonite |
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| Institution: | 1. Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute for Advanced Industrial Science and Technology, 1-1-1 Higashi, AIST Tsukuba Central 7, Tsukuba, Ibaraki 305-8567, Japan;2. Electric Power Development, Co. Ltd., 6-15-1 Ginza, Chuo, Tokyo 104-8165, Japan;1. Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, TX 78713, USA;2. ERDC International Research Office, 86-88 Blenheim Crescent, Ruislip HA4 7HB, UK;3. U.S Geological Survey, Menlo Park, CA 94205, USA;1. Research Institute of Environmental Geology, Chiba, 3-5-1 Inagekaigan, Mihama, Chiba 261-0005, Japan;2. National Institute of Polar Research, 10-3 Midoricho, Tachikawa, Tokyo 190-8518, Japan;3. Department of Polar Science, The Graduate University for Advanced Studies (SOKENDAI), Tokyo 190-8518, Japan;4. Ibaraki University, 2-2-1 Bunkyo, Mito, Ibaraki 310-8512, Japan;5. Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan;6. Department of Earth Sciences, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario L2S 3A1, Canada;7. Japan Branch of Geoscience for Environmental Management, International Union of Geological Sciences, 1277-1 Kamauchiya, Motoyahagi, Katori City, Chiba 287-0025, Japan;8. Shumei University, 1-1 Daigaku-cho, Yachiyo, Chiba 276-0003, Japan;9. Osaka City University, Tukuno-minami 1-204, 1800 Kusabe, Nishi, Sakai, Osaka 593-8312, Japan;1. Departamento de Enxeñería Química, Universidade de Vigo (Campus Ourense), Edificio Politécnico. As Lagoas, 32004, Ourense, Spain;2. CITI-Universidade de Vigo, Parque Tecnolóxico de Galicia, Rúa Galicia Nº 2, 32900, Ourense, Spain;3. Hifas da Terra SL, Portamuiños, 7, 36154, Bora, Pontevedra, Spain;1. Food Packaging Group, School of Food and Nutritional Sciences, University College Cork, College Road, Cork, Ireland;2. Department of Horticultural Engineering, Leibniz Institute for Agricultural Engineering (ATB), Potsdam, Germany;3. Department of Biochemistry, University College Cork, College Road, Cork, Ireland;1. Università di Udine, Dipartimento di Scienze degli Alimenti, Via Sondrio 2/A, 33100 Udine, Italy;2. Università di Padova, Dipartimento di Ingegneria Industriale, Via Marzolo 9, 35131 Padova, Italy;1. State Key Laboratory of Tea Plant Biology and Utilization, Key Laboratory of Food Nutrition and Safety, Schoole of Tea and Food Science & Technology, Anhui Agricultural University, Hefei 230036, China;2. Biotechnology Center of Anhui Agricultural University, Hefei 230036, China;1. Department of Chemical & Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 3K7, Canada;2. RWTH Aachen University, AVT—Biochemical Engineering, Forckenbeckstr. 51, 52074 Aachen, Germany;3. Leibniz Institute for Natural Product Research and Infection Biology - Hans-Knöll-Institute, Adolf-Reichwein-Str. 23, 07745 Jena, Germany |
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| Abstract: | A long-term (up to 10 ka) geochemical change in saline aquifer CO2 storage was studied using the TOUGHREACT simulator, on a 2-dimensional, 2-layered model representing the underground geologic and hydrogeologic conditions of the Tokyo Bay area that is one of the areas of the largest CO2 emissions in the world. In the storage system characterized by low permeability of reservoir and cap rock, the dominant storage mechanism is found to be solubility trapping that includes the dissolution and dissociation of injected CO2 in the aqueous phase followed by geochemical reactions to dissolve minerals in the rocks. The CO2–water–rock interaction in the storage system (mainly in the reservoir) changes the properties of water in a mushroom-like CO2 plume, which eventually leads to convective mixing driven by gravitational instability. The geochemically evolved aqueous phase precipitates carbonates in the plume front due to a local rise in pH with mixing of unaffected reservoir water. The carbonate precipitation occurs extensively within the plume after the end of its enlargement, fixing injected CO2 in a long, geologic period.Dawsonite, a Na–Al carbonate, is initially formed throughout the plume from consumption of plagioclase in the reservoir rock, but is found to be a transient phase finally disappearing from most of the CO2-affected part of the system. The mineral is unstable relative to more common types of carbonates in the geochemical evolution of the CO2 storage system initially having formation water of relatively low salinity. The exception is the reservoir-cap rock boundary where CO2 saturation remains very high throughout the simulation period. |
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