Sensitivity Analysis of Stratigraphic Parameters on the Yield of CO₂-Enhanced Geothermal Systems

This chapter delves into the sensitivity analysis of stratigraphic parameters on the yield of CO2-enhanced geothermal systems (EGS), focusing on the Qiabuqia dry hot rock body in the Republican Basin. The study employs a 3D discrete fracture network reservoir model with THM coupling to investigate the migration of CO2-EGS and its sensitivity. Key findings reveal that rock matrix permeability and fracture aperture are crucial parameters controlling thermal breakthrough time, while the net heat production rate is primarily influenced by rock matrix permeability, fracture aperture, and initial reservoir temperature. The analysis also highlights the roles of rock density, specific heat capacity, thermal expansion coefficient, and initial reservoir pressure. The Plackett–Burman method is utilized for sensitivity analysis, and the results are validated through numerical simulations. This research provides valuable insights into optimizing the performance of CO2-EGS, making it a compelling read for professionals in the field.