This study, as a part of the EU funded project MEET Multidisciplinary and multi-context demonstration of EGS exploration and Exploitation Techniques and potentials, aims to minimize the uncertainity in geology at greater depths by providing high quality datasets measured on both field analogues and drillcore samples of potential reservoir rocks, complemented by numerical models to predict reservoir parameters' behaviour during production and to minimize the drilling costs by focusing on the sites that already have certain infrastructure. Soultz-sous-Forêts, France (for Variscan crystalline basement overprinted by postvariscan extensional faults), Cornwall, United Kingdom (for Variscan base.ment not overprinted by late extensional faults), Göttingen, Germany (for Variscan metamorphic successions overprinted by younger extensional tectonics) and Havelange, Belgium (for Variscan metamorphic successions not overprinted by younger extensional tectonics) will be studied as four representative sites of EU Variscan basement. Focus of the PhD study area is Variscan crystalline basement, not overprinted by late extensional tectonics outcropped as Carnmenellis granite in SW England.