History of fluid circulation in an alteration zone of the Soultz-Sous-Forêts granite (Alsace, France)
Abstract
The Soultz-sous-Forêts area (Alsace, France), a pilot site for geothermal "Hot Dry Rock" exploitation, is characterized by a high surface heat flow induced by circulations of hot fluids percolating through the thick (1 to 3 km) sedimentary cover and the granitic basement (Soultz granite). Three main deep drill holes have been made around the Soultz HDR geothermal site at various depths (EPS-1: 2227 m. GPK-1: 3590 m, GPK-2: 3900 m).