Criteria and geological setting for the generic geothermal underground research laboratory, GEOLAB

Table 3 Criteria match of existing URLs in the crystalline basement worldwide

Name	Criterion 1:		Criterion 2:	Criterion 3:	Criterion 4:
Name	Fractured and rather homogenous crystalline matrix	Fracture transmissivity > 10⁻⁴ m² s⁻¹	Controllable hydraulic boundary condition	Comparable alteration (clay minerals)	Suitable stress condition	Sufficient overburden
Grimsel Test Site	Yes	No	Partly	No	No	Yes
Äspö Hard Rock Laboratory	Yes	Yes	Yes	Yes	Limit	Yes
Mizunami URL	Yes	Limit	Yes	No	No	Yes
Josef URL	No	No	Yes	No	Yes	Limit
Mine Reiche Zeche	Yes	Limit	No	Yes	Yes	Limit
Lindau Test Site	Yes	Yes	Yes	N/A (No)	Yes	No

Limit at the limit of the criteria. Partly the hydraulic boundary conditions are generally controllable, but due to storage lakes above the URL, special equipment may be needed