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Evaluation of the representative elementary volume (REV) of a geothermal fractured sandstone reservoir in North Germany

Müller, C.; Siegesmund, S.; Blum, P.

The objective of this study is to evaluate a representative elementary volume (REV) in a fractured geothermal sandstone reservoir in Germany using the discrete fracture network (DFN) model approach. Due to the lack of in situ data from the deep geothermal reservoir, field measurements of outcrop reservoir analogues were conducted to get a quantitative description of the DFN. Field measurements reveal that the geometry of the DFN is largely influenced by the lithological layering (e.g. relationship between joint spacing and bed thickness). Thus, DFN models have to be completed individually for each layer since each bed is distinct compared to its neighbouring beds. Various DFNs were generated using statistical-derived fracture input data. The two-dimensional universal distinct element code UDEC was used for fracture flow simulations. In order to determine the minimum REV, the equivalent average conductivity tensors were obtained with increasing block size. Plots of conductivity tensor coefficients versus block size exhibit only minor variation of the hydraulic properties with increasing block size. Hence, an REV size of 10 m × 10 m c ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000025925
Veröffentlicht am 03.01.2019
DOI: 10.1007/s12665-010-0485-7
Zitationen: 21
Web of Science
Zitationen: 21
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Jahr 2010
Sprache Englisch
Identifikator ISSN: 1866-6280, 1866-6299
KITopen-ID: 1000025925
HGF-Programm 35.14.01 (POF II, LK 01)
Erschienen in Environmental earth sciences
Band 61
Heft 8
Seiten 1713-1724
Schlagworte Geothermal energy, Numerical methods, Discrete fracture network, Fracture flow, Sedimentary rocks, Universal distinct element code UDEC, Buntsandstein
Nachgewiesen in Web of Science
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