Turan, Aysegül ; Bär, Kristian ; Bossennec, Claire ; Sass, Ingo (2024)
Geochemical, petrophysical and petrographical dataset of fractured Variscan granites of the Cornubian Batholith, SW United Kingdom.
doi: 10.48328/tudatalib-1345
Forschungsdaten, Bibliographie

Kurzbeschreibung (Abstract)

Outcrop analogue studies are of high priority as they allow the interpretation of geophysical surveys, minimizing the exploration risk, reliable predictions of reservoir properties and drawing conclusions on expected discharge, before drilling in a cost-wise way. Detailed knowledge of the petrophysical properties and petrographical characteristics of potential reservoir rocks improve the interpretation of forthcoming borehole logging and of fluid flow in different zones. Built datasets yet comprise the development of the necessary input for static and dynamic reservoir model parametrization. In the framework of EU H2020 funded ‘MEET’ project (‘Multidisciplinary and multi-context demonstration of EGS exploration and Exploitation Techniques and potentials’, grant agreement no:792037) outcrop analogue samples from the Cornubian Batholith, located in SW United Kingdom, were taken from the onshore plutons namely Land’s End, Tregonning-Godolphin, Carnmenellis, Carn Brea, Carn Marth and St. Austell. 47 granitic samples were collected from 23 outcrops representative for fresh, weathered, hydrothermally altered, fractured and faulted granites. From the outcrop samples, 338 cores with different diameters were obtained and the measurements of grain density, bulk density, permeability, porosity, acoustic wave velocity, thermal conductivity, thermal diffusivity, magnetic susceptibility, uniaxial compressive strength, Poisson’s ratio, Young’s modulus, tensile strength, shear strength, cohesion, coefficient of friction and shear modulus were performed on oven-dried cores under ambient temperature and atmospheric pressure in the HydroThermikum laboratory of the Technical University of Darmstadt. Petrographical and geochemical characterization were done for 47 outcrop analogue samples and for the drill cuttings, taken between 3,980 and 5,275 m (measured depth) in UD1; the production well of United Downs Deep Geothermal Power Project, first commercial deep geothermal project of UK, through thin section analysis, X-ray diffraction (XRD) and X-ray fluorescence (XRF). This dataset presents the geochemical, petrophysical and petrographical properties of Early Permian aged fractured Variscan granite specifically not overprinted by any younger tectonic regime. It forms a basis to other publications, where the results of the aforementioned multiparameter rock characterization are discussed in detail and are used for stochastic regional resource assessment, respectively. It follows the same database structure as PetroPhysical Property Database (P³) of Bär et al. (2020). Each analyzed core is provided with a sample ID according to the naming convention within MEET project as ‘MEETCW001001001’ (Project name - region name - location number - sample number - core number).

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