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• W4366505800 abstract "The utilisation of supercritical geothermal fluids depends on the assessment of the long-term effects of fluid-rock interaction on flow and transport behaviour. Reactive transport simulations are used for these assessments quantitatively based on high-quality thermodynamic and chemical data, understanding of the thermochemical constraints, and capability for accurate, stable, and rapid simulations. This work explores the precipitation/dissolution behaviour of basalt in water under supercritical conditions (400 °C and 502 bar) based on a comprehensive laboratory study conducted by Passarella (2021). The mineral reactions in the experiment were found to be largely kinetically controlled based on the model results. The final model dissolution rate constants were generally within an order of magnitude of the values calculated using the Arrhenius Law at 400 °C, based on published k25 and Ea values, paired with the reactive surface area estimates following the work of White and Peterson (1990). This indicates that the reaction rates at the experimental supercritical conditions are consistent with those observed at subcritical conditions for each mineral. It is theorised that this is because the properties of supercritical water at high pressures are comparable to subcritical water, specifically in terms of viscosity and the dielectric constant. A similar review of the final model precipitation rate constants showed better agreement with neutral dissolution rates extended to precipitation than the estimates following Horiuti (1957) for the experimental conditions. Mineral alterations during the experiment depended primarily on glass dissolution based on the model. Fluid saturation relative to the other minerals increased from the release of glass dissolution products, affecting their dissolution rates. Glass dissolution was also the primary source of components for secondary mineral formation, including celadonite, which also depended on olivine dissolution to provide magnesium. Upon glass depletion, the dissolution rates of the remaining primary minerals increased, and celadonite dissolved. Chlorite was deposited later in the modelled experiment than the other secondary minerals." @default.
• W4366505800 created "2023-04-22" @default.
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• W4366505800 date "2023-06-01" @default.
• W4366505800 modified "2023-09-27" @default.
• W4366505800 title "Reactive transport modelling under supercritical conditions" @default.
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• W4366505800 doi "https://doi.org/10.1016/j.geothermics.2023.102725" @default.
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