Coupled Thermo–Hydro–Mechanical–Seismic Modeling of EGS Collab Experiment 1

An important technical issue in the enhanced geothermal system (EGS) is process of fracture shear and dilation, network propagation induced seismicity. EGS development requires an ability to reliably predict network’s permeability evolution. Laboratory field studies such as Collab Utah FORGE, modeling simulations provide valuable lessons for successful commercial design. In this work we present a analysis Testbed Experiment 1 (May 24, Stim-II ? 164 Notch) interpret stimulation results relation creation network. doing so, use improved 3D discrete model coupled with thermo-poroelastic finite element (FEM) which can consider evolution A dual-scale semi-deterministic generated by combining data from image logs, foliations/micro-fractures, core. The natural properties (e.g., length asperity) follow stochastic distribution. under injection considered ultrafast analytical approach. This method allows multiple seismic events occur on around fracture. uncertainties event clouds are better constrained using energy conservation law. Numerical show that simulated pressure profiles reasonably trend observed test. support concept was propagated well connecting production via intersection coalescence other fractures consistent plausible flow paths field. numerical generally match observation. distribution micro-seismicity have good agreement field-observed data.