Fig. 6
From: Hydrological constraints on the potential of enhanced geothermal systems in the ductile crust
The permeability structure around a A–C vertically or D–F horizontally oriented NDR-EGS after 1 year of fluid circulation. Areas corresponding to the stimulated volume (> 10–16 m2) are shaded in red. Results are shown for maximum permeability increase of A, D two, B, E three, or C, F four orders of magnitude permeability increase relative to the background depth-dependent permeability, corresponding to maximum permeability of A, D ~ 10–16 m2, B, E ~ 10–15 m2, or C, F ~ 10–14 m2. Black dashed lines show isobars and the white line the 375 °C isotherm. Rock with permeability less than 10–18 m2 is shown in white and represents the unstimulated part of the domain