In this article an extended description of the implementation of the deep geothermal wells in Rittershoffen (France), implemented in the framework of the ECOGI (Exploitation of Geothermal Heat for Industry) project, is given. The wells GRT-1 and GRT-2 drilled in 2012, respectively in 2014, offer a unique opportunity to gather highquality datasets on a deep geothermal system in the Upper Rhine Graben at the transition between the Buntsandstein sandstone and the Palaeozoic granite basement.