Structural Architecture and Permeability Patterns of Crystalline Reservoir Rocks in the Northern Upper Rhine Graben: Insights from Surface Analogues of the Odenwald

Fracture network is a crucial element to address in any model of the thermo-hydro-mechanical behaviour of a reservoir rock. This study aims to provide quantified datasets and a further understanding of the critical parameters of the fracture network pattern in crystalline rocks. In the Northern Uppe...

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Bibliographic Details
Published in:Energies (Basel) 2022-02, Vol.15 (4), p.1310
Main Authors: Bossennec, Claire, Seib, Lukas, Frey, Matthis, van der Vaart, Jeroen, Sass, Ingo
Format: Article
Language:English
Subjects:
Apertures
Crystal structure
crystalline rock
Crystalline rocks
Crystallinity
Datasets
discrete fracture network
faulted basement
flow properties
fracture network properties
Geology
geothermal reservoirs
Graben
Heat storage
Heat treatment
Industrial applications
Investigations
Lithology
Mechanical properties
Network topologies
Outcrops
Permeability
Reservoirs
Rocks
Stress distribution
Topology
Two dimensional analysis
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Summary:Fracture network is a crucial element to address in any model of the thermo-hydro-mechanical behaviour of a reservoir rock. This study aims to provide quantified datasets and a further understanding of the critical parameters of the fracture network pattern in crystalline rocks. In the Northern Upper Rhine Graben, such rock units are targeted for multiple energy applications, from deep geothermal heat extraction to heat storage. Eleven outcrops were investigated with a combined LiDAR and 2D profiles analysis to extract faults and fracture network geometrical parameters, including length distribution, orientation, connectivity, and topology. These properties are used to decipher the structural architecture and estimate the flow properties of crystalline units. Fracture networks show a multi-scale power-law behaviour for length distribution. Fracture topology and orientation are mainly driven by both fault networks and lithology. Fracture apertures and permeability tensors were then calculated for two application case studies, including the stress field effect on aperture. Obtained permeabilities are in the range of those observed in the sub-surface in currently exploited reservoirs. The dataset provided in this study is thus suitable to be implemented in the modelling during the exploration stage of industrial applications involving fractured crystalline reservoirs.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15041310