Numerical Study on the Impacts of Fracture Distribution of Geothermal Reservoirs on Heat Extraction Efficiency

Abstract In geothermal energy development, reservoir fracture distribution significantly affects heat extraction efficiency. In this paper, we employ a 2D thermo-hydro-mechanical (HTM) model to generate random fracture networks and evaluate heat extraction efficiency. We find that (1)excessive fracture intensity does not enhance heat extraction efficiency; (2)reasonably regulating fracture number and length, constructing a specific fracture network, and increasing injection-production well spacing benefit geothermal energy extraction and reservoir lifespan extension. These results provide theoretical support for reservoir modification and fracture network design, thereby advancing efficient geothermal energy development.