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Evidence for the heterogeneity of the pore structure of rocks from comparing the results of various techniques for measuring hydraulic properties

  • We applied three oscillatory methods, the previously presented axial pore-pressure and pore-flow methods, and the laboratory application of the radial oscillatory pore-flow method, and performed steady-state flow-through experiments (Darcy tests), for comparison, in experiments on samples of Westerly granite and Wilkeson sandstone. The granite and the sandstone exhibit pore spaces dominated by micro-fractures and by the granular-medium character with a connected porosity of about 1 and 10 %, respectively. Permeability determined by the axial pore-pressure method shows the closest agreement with the results of the Darcy tests. Apparent porosity and drained modulus derived from specific storage capacity deviate from measured connected porosity and reference values, respectively. The observed deviations of the hydraulic properties between methods suggest that they bear information about the structure of the pore space. Only for the sandstone, anisotropy in hydraulic properties appears to contribute to differences between the results of the various methods. We argue that oscillatory testing provides three indicators for heterogeneity, period dependence, the relation between apparent and connected porosity, and the relation between amplitude ratio and apparent penetration depth, calculated from the simple scaling law for homogeneous materials. These indicators consistently classify the samples of Wilkeson sandstone as hydraulically homogeneous and those of Westerly granite as heterogeneous.

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Metadaten
Author:Laura L. ScheppORCiDGND, Jörg RennerGND
URN:urn:nbn:de:hbz:294-95655
DOI:https://doi.org/10.1007/s11242-020-01508-8
Parent Title (English):Transport in porous media
Publisher:Springer Science + Business Media B.V.
Place of publication:Dordrecht
Document Type:Article
Language:English
Date of Publication (online):2023/01/06
Date of first Publication:2020/11/17
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Effective transport properties; Microstructure; Oscillatory pore-flow method; Oscillatory pore-pressure method; Permeability; Porosity
Volume:136
First Page:217
Last Page:243
Note:
Dieser Beitrag ist auf Grund des DEAL-Springer-Vertrages frei zugänglich.
Dewey Decimal Classification:Naturwissenschaften und Mathematik / Geowissenschaften, Geologie
open_access (DINI-Set):open_access
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International