Integrated Thermo-Hydro-Chemo-Mechanical (THCM) Analysis for Evaluating CO2 Plume Geothermal System Potential

Abstract Objectives/Scope: The objective of this study is to conduct a thorough investigation into CO₂ Plume Geothermal (CPG) systems using a Thermo-Hydro-Chemo-Mechanical (THCM) model. It aims to unravel the complexities of supercritical CO₂ interactions within geothermal formations and to evaluate the parameters critical to optimizing geothermal output. Additionally, the research intends to refine the predictive capabilities of current models, ensuring a more accurate assessment of the geothermal potential and contributing to the sustainable development of geothermal resources. Methods, Procedures, Process: Utilizing an integrative THCM model, we assessed the role of supercritical CO₂ in geothermal energy extraction. Geological, chemical, and mechanical parameters were meticulously quantified to simulate subsurface scenarios impacting the injectivity and productivity of CPG systems. Key chemical interactions and their impact on rock integrity were also modeled, incorporating acidification and carbonation reactions and their effect on rock strength and reservoir behavior under varying stress conditions. These procedures enable a comprehensive understanding of the multifaceted influences on CPG system efficiency. Results, Observations, Conclusions: The study revealed that geochemical reactions, including acidification and carbonation, could alter rock integrity and affect the mechanical stress within the reservoir. These findings suggest that a careful balance of chemical and mechanical factors is essential for the optimal functioning of CPG systems. Novel/Additive Information: This research introduces a novel THCM model, incorporating a more nuanced simulation of geothermal reservoirs, particularly in the context of supercritical CO₂ injection. By identifying the key parameters that govern the system's efficiency, this study contributes new insights to the field of renewable energy and informs better reservoir management strategies.