| Abstract |
Reactive transport modelling of a high-temperature flow-through experiment was developed to investigate the geochemical and hydrodynamic effects of CO2-enriched condensate reinjection into andesitic geothermal reservoirs. The study builds on the experiment conducted using steam condensate and Southern Negros andesite at 230 °C and 200 bar. The experimental results revealed significant quartz dissolution accompanied by secondary mineral deposition. These findings were used to calibrate our fluid-rock interaction simulations. In the absence of inclusion of CO2, the model outcome shows an enhancement of porosity and permeability. The study then explores how various CO2 concentrations in the injected fluid influence fluid pH, mineral dissolution or precipitation trend, and permeability. Introducing CO2 could enhance the permeability near the injection part, within certain limits, due to more mineral dissolution. Through this combined experimental and modelling framework, the study enhances our understanding of the role of CO2 in fluid-rock reactivity and strategies for optimising reservoir management. |