Abstract Deep fractured carbonate reservoirs are promising geothermal resources, but their production performance is controlled by coupled fluid flow, heat transfer, stress evolution, fracture-aperture change, and water-rock reactions. This study develops a field-informed thermo-hydro-mechanical-chemical (THMC) model to investigate heat extraction and operational scenarios in the Gaoyuzhuang carbonate reservoir, using Well D22 in the Xiongan New Area as a representative case.
