TITLE:
Numerical Simulation Study on Exploitation of Fractured Geothermal Reservoir
AUTHORS:
Dengheng Zheng, Manting Deng, Kexin Liu, Huibing Cheng
KEYWORDS:
Geothermal System, Multi-Field Coupling, Discrete Cracks, Thermal Energy Extraction
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.6,
June
29,
2026
ABSTRACT: The operation of a geothermal system is a highly complex process, which is deeply influenced by multiple factors such as the complex multi-field coupling effect between heat conduction, fluid flow and rock mechanical deformation and the non-uniform distribution of the fracture network. On this basis, considering the thermo-hydro-mechanical (THN) coupling effect, this paper systematically studies the evolution of the geothermal reservoir heat energy extraction process based on a two-dimensional discrete fracture network. The results show that the low temperature area shows obvious non-uniform expansion from the injection well area to the surrounding area, and the fracture has a controlling effect on the diffusion of the low temperature area. The high value distribution of pore pressure appears in the injection well area, while the production well area shows a low value distribution. The high value distribution area of pore pressure near the injection well shows an expansion trend with time. The high permeability area is mainly distributed near the injection well, while the permeability of the reservoir rock near the production well is relatively low, and the permeability of the measuring point near the injection well is higher than that far away from the injection well. The research results can provide a theoretical basis and reference for the production and operation of geothermal engineering.