Geothermal systems are practical when the proper temperature settings, geological structures, and petrophysical characteristics exist near the ground surface, all of which should be evaluated to identify economically viable reserves. This dissertation presents procedures to examine (1) geological structures, (2) fluid flow pathways and their physical properties, and (3) subsurface temperature of geothermal systems by incorporating various geoscience datasets, including audio-magnetotelluric (AMT) data, rock physical properties, well logs, and fluid sample data.ix