A geochemical clogging model with carbonate precipitation rates under hydrothermal conditions |
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| Institution: | 1. Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan;2. Department of Mining Engineering, Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401, USA;3. Department of Natural Resources and Environment, Mitsubishi Materials Techno Corp., 1-297 Kitabukuro, Saitama 330-0835, Japan;4. Graduate School Division of Science and Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, 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. National Iranian Oil Company Exploration Directorate (NIOCEXP), 1st Dead-end, Seoul Street, NE Sheikh Bahaei Square, PO Box 19395-6669, Tehran, Iran;2. Ministry of Training and Education, Bentol-Hoda Street, Fajr Square, Shahriyar, Iran;1. GEUS, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen, Denmark;2. Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark;1. State Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China;2. Centre of Exploration Targeting, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;3. Chengdu Centre, China Geological Survey, Chengdu, Sichuan 610081, China;4. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;5. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;6. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;7. Faculty of Earth Resources, China University of Geosciences, Wuhan 470074, China;1. Istituto Nazionale di Geofisica e Vulcanologia, Sez. di Napoli – Osservatorio Vesuviano, Italy;3. Helmholtz-Zentrum Potsdam – Deutsches GeoForschungsZentrum GFZ, Germany;1. University of Alberta, Department of Earth and Atmospheric Sciences, Canada;2. Helmholtz Zentrum Potsdam, Deutsches Geoforschungszentrum, Germany |
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| Abstract: | A step-wise numerical calculation method was developed to provide predictions of when and where carbonate deposits might be found through reservoirs during CO2 sequestration. Flow experiments through porous media using a supersaturated carbonate fluid were also performed in order to observe flow rates. In order to evaluate precipitation rates and permeability change in the formation, calculated flow rates based on the proposed geochemical clogging model were compared with the experimentally observed data. Both high and low temperature cases were studied to understand how hydrothermal conditions can affect precipitation rates of carbonate. According to chemical kinetics, growth rates of minerals are generally proportional to the saturation index (S.I.) that depends on temperature. Thus, a supersaturated fluid has the advantage of improving the filtration and the amount of C fixation (σ). However, when the ratio of filtration coefficient (λ) to pore fluid velocity (u) increases, the permeability around the injection point tends to be significantly reduced by carbonate accumulation, and thus, this might result in insufficient injection of CO2. Therefore, it is essential to understand how to control both λ and u so that the precipitation of carbonate can be located as far away from the inlet as possible. |
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