In an attempt to define a unique proposal for all the structural systems around the installation area of a new production well, the objective is to affirm and confirm the depth of the area of exploitative interest. This comprises an area in which the rock is characterized by a strong hydrothermal alteration, which is fractured and where good permeability can be expected, with reservoir temperatures that increase from 180 ° C to 300 ° C with depth. It is proposed in this book the explanation of all the necessary stages, which belong to the Geologist, for the realization of a vertical well, in a geothermal field of electric power production.