Deep heat source detection using the magnetotelluric method and geothermal assessment of the Farafra Oasis, Western Desert, Egypt

•Farafra oasis is the focal point for western Egypt's long-term development.•MT survey was used to explain the genesis of multiple thermal wells in the oasis.•Numerical model of Farafra's geothermal system was developed.•The Farafra Oasis aquifer is heated by a deep, high-temperature Pluton.