COMPARING FRACHEM AND TOUGHREACT FOR REACTIVE TRANSPORT MODELING

Coupled modelling of fluid flow and reactive transport in geothermal systems is challenging because of reservoir conditions such as high temperatures, elevated pressures and sometimes high salinities of the formation fluids. Thermal-hydrological-chemical (THC) codes, such as FRACHEM and TOUGHREACT, have been developed to evaluate the long-term hydrothermal and chemical evolution of exploited reservoirs. In this study, the two codes were applied to model the same geothermal reservoir, to forecast reservoir evolution using respective thermodynamic and kinetic input data. A recent (unreleased) TOUGHREACT version allows the use of either a