An Interdisciplinary Decameter-scale Reservoir Stimulation Practice at the Grimsel Test Site

A decameter-scale in-situ hydraulic stimulation and circulation experiment has been planned to be executed in the Deep Underground rock Laboratory (DUG Lab) at the Grimsel Test Site (GTS). The general objective of this experiment is the extension of our understanding about the pressure, temperature and stress changes on the rock mass behavior during the hydraulic stimulation for the EGS purposes. In this context, the main goal is to investigate the effect of hydro-shearing on the local stress variation as well as transient and permanent permeability changes with comprehensive thermo-hydro-mechanical (THM) and acoustic emission monitoring. This experiment is designed such that stimulation processes are recorded in a dataset that is unique in THM coupled processes and induced seismicity research.