Preprints
https://doi.org/10.5194/essd-2020-211
https://doi.org/10.5194/essd-2020-211

  02 Sep 2020

02 Sep 2020

Review status: a revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

Database of Petrophysical Properties of the Mid-German Crystalline High

Sebastian Weinert1,2, Kristian Bär1, and Ingo Sass1,2 Sebastian Weinert et al.
  • 1Geothermal Science and Technology, Technical University of Darmstadt, Darmstadt, 64287, Germany
  • 2Darmstadt Graduate School of Excellence Energy Science and Engineering, Technical University of Darmstadt, Darmstadt, 64287, Germany

Abstract. Petrophysical properties are a key element for reservoir characterization but also for interpreting the results of various geophysical exploration methods or geophysical well logs. Furthermore, petrophysical properties are commonly used to populate numerical models and are often critically governing the model results. Despite the common need of detailed petrophysical properties, data is still very scarce and often not available for the area of interest. Furthermore, both the online research for published property measurements or compilations, as well as dedicated measurements campaigns of the selected properties, which requires comprehensive laboratory equipment, can be very time-consuming and costly. To date, most published research results are often focused on a limited selection of parameters only and hence, researching various petrophysical properties, needed to account for the thermal-hydraulic-mechanical behavior of selected rock types or reservoir settings, can be very laborious.

Since for deep geothermal energy in central Europe, the majority of the geothermal potential or resource is assigned to the crystalline basement, a comprehensive database of petrophysical properties comprising rock densities, porosity, rock matrix permeability, thermal properties (thermal conductivity and diffusivity, specific heat capacity) as well as rock mechanical properties as compressive and shear wave velocities, unconfined compressive strength, Young’s modulus, Poisson’s ratio, tensile strength and triaxial shear strength was compiled by measurements conducted at the HydroThermikum lab facilities of the Technical University of Darmstadt.

Analyzed samples were mostly derived from abandoned or active quarries and natural or artificial outcrops such as road cuts, river banks or steep hill slopes. Furthermore, samples of the cored deep wells Worms 3 (samples from 2175–2195 m), Stockstadt 33R (samples from 2245–2267 m), Weiterstadt 1 (samples from 2502–2504 m), Tiefbohrung Groß-Umstadt/Heubach, B/89–B02 and the cored shallow wells Forschungsbohrung Messel GA 1 and 2 as well as GWM17 Zwingenberg, GWM1A Zwingenberg, Langenthal BK2/05, EWS267/1 Heubach, and archive samples of the Institut für Steinkonservierung e.V. in Mainz originating from a comprehensive large scale sampling campaign in 2007 were investigated. The database (Weinert et al. 2020b, https://doi.org/10.25534/tudatalib-278) aims to provide easily accessible petrophysical properties of the Mid-German Crystalline High, measured on 224 locations in Bavaria, Hesse, Rhineland-Palatinate and Thuringia and comprising 26,951 single data points. Each data point is addressed with the respective metadata such as sample identifier, sampling location, petrography and if applicable stratigraphy and sampling depth (in case of well samples).

Sebastian Weinert et al.

 
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Sebastian Weinert et al.

Data sets

Petrophysical Properties of the Mid-German Crystalline High: A Database for Bavarian, Hessian, Rhineland-Palatinate and Thuringian Outcrops Sebastian Weinert, Kristian Bär, Ingo Sass https://doi.org/10.25534/tudatalib-278

Sebastian Weinert et al.

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Latest update: 04 Mar 2021
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Short summary

Physical rock properties are a key element for resource exploration, the interpretation of results from geophysical methods or the parameterization of physical or geological models. Despite the need of physical rock properties, data is still very scarce and often not available for the area of interest.

The database presented aims to provide easy access to physical rock properties measured on 224 locations in Bavaria, Hesse, Rhineland-Palatinate and Thuringia (Germany).