Preprints
https://doi.org/10.5194/hess-2023-307
https://doi.org/10.5194/hess-2023-307
06 Feb 2024
 | 06 Feb 2024
Status: this preprint is currently under review for the journal HESS.

Solutions for Thermally-driven Reactive Transport and Porosity Evolution in Geothermal Systems (“Reactive Lauwerier Problem”)

Roi Roded, Einat Aharonov, Piotr Szymczak, Manolis Veveakis, Boaz Lazar, and Laura E. Dalton

Abstract. Subsurface non-isothermal fluid injection is a ubiquitous scenario in energy and water resources applications, which can lead to geochemical disequilibrium and thermally-driven solubility changes and reactions. Depending on the nature of the solubility of a mineral, the thermal change can lead to either mineral dissolution or precipitation (due to undersaturation or supersaturation conditions). Here, by considering this thermo-hydro-chemical scenario and by calculating the temperature-dependent solubility using a non-isothermal solution (the so-called Lauwerier solution), thermally-driven reactive transport solutions are derived for a confined aquifer. The coupled solutions, hereafter termed the “Reactive Lauwerier Problem”, are developed for axisymmetric and Cartesian symmetries, and additionally provide the porosity evolution in the aquifer. The solutions are then used to study two common cases: (I) hot CO2-rich water injection into carbonate aquifer; and (II) hot silica-rich water injection, leading to mineral dissolution and precipitation, respectively. We discuss the timescales of such fluid-rock interactions and the changes in hydraulic system properties. The solutions and findings here contribute to the understanding and management of subsurface energy and water resources, like aquifer thermal energy storage (ATES), aquifer storage and recovery (ASR) and reinjection of used geothermal water. The solutions are also useful for developing and benchmarking complex coupled numerical codes.

Roi Roded, Einat Aharonov, Piotr Szymczak, Manolis Veveakis, Boaz Lazar, and Laura E. Dalton

Status: open (until 02 Apr 2024)

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Roi Roded, Einat Aharonov, Piotr Szymczak, Manolis Veveakis, Boaz Lazar, and Laura E. Dalton
Roi Roded, Einat Aharonov, Piotr Szymczak, Manolis Veveakis, Boaz Lazar, and Laura E. Dalton

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Short summary
Common practices in water resources management and geothermal applications involve the injection of hot or cold water into aquifers. The resulting thermal changes may lead to chemical disequilibrium and consequent mineral dissolution/precipitation in the rock void-space. A mathematical model is developed to study the effects of such thermal-fluid injection on the evolution of water composition, aquifer porosity and permeability. The model is then applied to two important case studies.