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Matrix versus fracture permeability in a regional sandstone aquifer (Wajid sandstone, SW Saudi Arabia)

Al Ajmi, H. ; Hinderer, Matthias ; Hornung, Jens ; Bassis, A. ; Keller, M. ; Rausch, R. ; Schüth, C. :
Matrix versus fracture permeability in a regional sandstone aquifer (Wajid sandstone, SW Saudi Arabia).
[Online-Edition: http://link.springer.com/article/10.1007/s00767-014-0258-4]
In: Grundwasser, 19 (2) pp. 151-157. ISSN 1430-483X (Print) 1432-1165 (Online)
[Artikel], (2014)

Offizielle URL: http://link.springer.com/article/10.1007/s00767-014-0258-4

Kurzbeschreibung (Abstract)

Sandstones are often characterized as fractured aquifers. We present a case study of the Wajid sandstone, which forms a regional aquifer system in SW Saudi Arabia, where matrix, fracture, and large-scale hydraulic conductivities are coincident. The measurements deal with different scales and methods and are based on porosity and permeability measurements in the laboratory, as well as pumping tests in the field. Porosities of the sandstone samples in general are high and range between less than 5 % and more than 45 %. Gas permeabilities for strongly cemented samples are < 1 mD, whereas most samples range in between 500 and 5,000 mD. There is only a weak anisotropy with preference of the horizontal x-, y-directions. Hydraulic conductivities of the matrix samples (5.5 · 10−6 m/s and 1.1 · 10−5 m/s for the Upper and Lower Wajid sandstone, respectively) were in the same order of magnitude compared to hydraulic conductivities derived from pumping tests (8.3 · 10−5 m/s and 2.2 · 10−5 m/s for the Upper and Lower Wajid sandstone, respectively).

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Al Ajmi, H. ; Hinderer, Matthias ; Hornung, Jens ; Bassis, A. ; Keller, M. ; Rausch, R. ; Schüth, C.
Titel: Matrix versus fracture permeability in a regional sandstone aquifer (Wajid sandstone, SW Saudi Arabia)
Sprache: Englisch
Kurzbeschreibung (Abstract):

Sandstones are often characterized as fractured aquifers. We present a case study of the Wajid sandstone, which forms a regional aquifer system in SW Saudi Arabia, where matrix, fracture, and large-scale hydraulic conductivities are coincident. The measurements deal with different scales and methods and are based on porosity and permeability measurements in the laboratory, as well as pumping tests in the field. Porosities of the sandstone samples in general are high and range between less than 5 % and more than 45 %. Gas permeabilities for strongly cemented samples are < 1 mD, whereas most samples range in between 500 and 5,000 mD. There is only a weak anisotropy with preference of the horizontal x-, y-directions. Hydraulic conductivities of the matrix samples (5.5 · 10−6 m/s and 1.1 · 10−5 m/s for the Upper and Lower Wajid sandstone, respectively) were in the same order of magnitude compared to hydraulic conductivities derived from pumping tests (8.3 · 10−5 m/s and 2.2 · 10−5 m/s for the Upper and Lower Wajid sandstone, respectively).

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Grundwasser
Band: 19
(Heft-)Nummer: 2
Verlag: Springer-Verlag
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften
Fachbereich Material- und Geowissenschaften > Geowissenschaften
Fachbereich Material- und Geowissenschaften > Geowissenschaften > Angewandte Sedimentgeologie
Fachbereich Material- und Geowissenschaften > Geowissenschaften > Hydrogeologie
Hinterlegungsdatum: 19 Jun 2015 11:27
Offizielle URL: http://link.springer.com/article/10.1007/s00767-014-0258-4
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