This section provides laboratory facilities, conditions for field tests and data for calibration of thermo-hydraulic models. This includes hydrochemical and isotopic testing of groundwater and chemical interaction between rocks and water leading to corrosion or incrustation in the exchanger. Equipment is also available to perform circulation, pressure and infiltration tests on shallow boreholes. Thermohydraulic modelling allows, among other things, geothermal characterisation of the massif, modelling of energy storage processes and the effect of temperature changes on chemical processes, and calibration of models.