Geomechanics is a critical component for the development of deep geothermal resources. In this talk, I will first highlight the difference between hydro-thermal and petrothermal systems in terms of characteristics, required technologies, risks and costs. I will then review some geomechanical aspects related to drilling, and hydraulic stimulation of these reservoirs. The difference between classical hydraulic fracturing used for oil and gas wells and the concept of hydro-shearing for deep petrothermal systems will be discussed in details. The critical aspect of fluid induced seismicity will be illustrated both from field example and from theoretical simulations. Finally, opportunities for the use of technologies developed in the context oil and gas reservoirs will be discussed in the hope of stimulating the emergence of new concepts for the development of geothermal energy for low as well as high enthalpy systems.
