Below the surface of the earth, there exist geothermal resources with the potential to make a significant contribution to the increasing demand of power consumption and environmental sustainability. However, the expensive capital costs of drilling the geothermal well still represent the main challenge to the implementation of this resource in energy systems. Dismissed hydrocarbon wells in mature oilfields can be considered good candidates for the geothermal energy exploitation as they usually have high bottom-hole temperature, reliable wellbore integrity and large production capacity. Existing borehole and perforation data can be also useful to have geological, geophysical and geochemical information about the sub-surface reservoirs and allow direct access to the sub-soil heat.