Convective mixing fingers and chemistry interaction in carbon storage
| Autor: | Fidel Grandia, Eric H. Oelkers, Elena Abarca, Alvaro Sáinz-García, Albert Nardi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Chemistry Mechanical engineering Aquifer Soil science Context (language use) Management Monitoring Policy and Law 01 natural sciences Pollution Instability Industrial and Manufacturing Engineering 010305 fluids & plasmas Permeability (earth sciences) General Energy 0103 physical sciences Convective mixing Porosity Dissolution Mixing (physics) 0105 earth and related environmental sciences |
| Zdroj: | International Journal of Greenhouse Gas Control. 58:52-61 |
| ISSN: | 1750-5836 |
| DOI: | 10.1016/j.ijggc.2016.12.005 |
| Popis: | Dissolution of carbon-dioxide into formation fluids during carbon capture and storage (CCS) can generate an instability with a denser CO2-rich fluid located above the less dense native aquifer fluid. This instability promotes convective mixing, enhancing CO2 dissolution and favouring the storage safety. Convective mixing has been extensively analysed in the context of CCS over the last decade, however the interaction between convective mixing and geochemistry has been insufficiently addressed. This relation is explored using a fully coupled model taking into account the porosity and permeability variations due to dissolution-precipitation reactions in a realistic geochemical system based on the Hontomin (Spain) potential CCS site project. This system, located in a calcite, dolomite, and gypsum bearing host rock, has been analysed for a variety of Rayleigh and Damkohler values. Results show that chemical reactions tend to enhance CO2 dissolution. The model illustrates the first stages of porosity channel development, demonstrating the significance of fluid mixing in the development of porosity patterns. The influence of non-carbon species on CO2 dissolution shown in this study demonstrates the needs for realistic chemical and kinetic models to ensure the precision of physical models to accurately represent the carbon-dioxide injection process. |
| Databáze: | OpenAIRE |
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