TU Darmstadt / ULB / TUbiblio

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

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

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).

Item Type: Article
Erschienen: 2014
Creators: Al Ajmi, H. and Hinderer, Matthias and Hornung, Jens and Bassis, Alexander and Keller, Martin and Rausch, Randolf and Schüth, Christoph
Title: Matrix versus fracture permeability in a regional sandstone aquifer (Wajid sandstone, SW Saudi Arabia)
Language: English
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).

Journal or Publication Title: Grundwasser
Volume: 19
Number: 2
Publisher: Springer-Verlag
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology
11 Department of Materials and Earth Sciences > Earth Science > Hydrogeology
Date Deposited: 19 Jun 2015 11:27
Official URL: http://link.springer.com/article/10.1007/s00767-014-0258-4
Export:
Suche nach Titel in: TUfind oder in Google

Optionen (nur für Redakteure)

View Item View Item