New Challenges in Geomechanics - From the Enhanced Geothermal System towards the CO2 Underground Storage

During the three last decades, geomechanics has been, in a large part, driven by the evolution in the domain of energy. After its contribution in the conventional oil and gas resources and in the nuclear waste repository, new domains such unconventional geothermal energy and CO2 underground storage have stepped in since around 10 years and more recently, unconventional gas and oil resources continue to contribute to the evolution of geomechanics. In this paper, we have focused on the Enhanced Geothermal Systems and on the CO2 underground storage, highlighting the new challenges for each of these two domains and the common ones: geomechanical role of the faults, stress fields and behavior of the near well.