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A discretely fractured reservoir has the capability to support and sustainlong term geothermal energy extraction operations. The process of injectingcold water to extract hot water from a fracture reservoir results in thermaland poroelastic stresses in the rock matrix. Therefore, thesethermo-hydro-mechanical (THM) mechanisms govern the efficiency of an enhancedgeothermal system (EGS) operation. However, THM mechanisms are governed byvarious rock and fluid parameters as well as on the initial and boundaryconditions of the model set-up. In this paper, we have identified and analyzed22 such parameters. Due to this large number of involved parameters, it isdifficult to accurately estimate the relative importance of individualparameters. To address this issue, we have performed an extensive sensitivityanalysis for the purpose of the Horizon 2020 project, Multidisciplinary andmulti-contact demonstration of EGS exploration and Exploitation Techniques andpotentials (H2020 MEET) using the design of the experiment method andidentified key parameters influencing three key outcomes of the simulation:thermal breakthrough time, mass flux, and overall energy recovery. We foundthat for a given discrete fracture network, the fracture aperture, the rockmatrix permeability, and the wellbore radius are the most influentialparameters controlling the thermal breakthrough time, mass flux, and overallenergy recovery.

Key parameters affecting the performance of fractured geothermal reservoirs: a sensitivity analysis by thermo-hydraulic-mechanical simulation