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Fracture flow modelling based on satellite images of the Wajid sandstone, Saudi Arabia

Zeeb, C. and Göckus, D. and Bons, P. and Al Ajmi, H. and Rausch, R. and Blum, P. (2010):
Fracture flow modelling based on satellite images of the Wajid sandstone, Saudi Arabia.
In: Hydrogeology Journal, SpringerLink, pp. 1699-1712, 18, (7), [Online-Edition: https://link.springer.com/article/10.1007/s10040-010-0609-x],
[Article]

Abstract

Large-scale geological features have been identified by satellite imagery and global positioning system data in the Wajid Sandstone in Saudi Arabia. The main objective is to evaluate the importance of fractures for the overall flow behaviour in this fractured rock aquifer and to estimate in-situ hydraulic apertures. Data on fractures and lineaments were available for three outcrops. By applying a “cut-out” routine on the fracture endpoint data of these fracture trace windows, three deterministic discrete fracture networks (DFN), with an area of 100 m × 100 m, could be generated. These were used to simulate the fracture flow and to determine the hydraulic conductivity tensors. Using additional data on hydraulic pumping tests and matrix conductivities, in-situ hydraulic apertures could be determined. Average in-situ hydraulic apertures range from 1,300 to 1,700 µm. Observations from the field support these results. In addition, a hydraulic conductivity ratio between the matrix and fracture system was used to identify the contribution of the DFN to the overall fluid transport. A ratio of 10.4 was determined, which indicates that the effective flow behaviour in the Wajid Sandstone aquifer is not entirely dominated by the fracture system, though evidently strongly controlled by it.

Item Type: Article
Erschienen: 2010
Creators: Zeeb, C. and Göckus, D. and Bons, P. and Al Ajmi, H. and Rausch, R. and Blum, P.
Title: Fracture flow modelling based on satellite images of the Wajid sandstone, Saudi Arabia
Language: English
Abstract:

Large-scale geological features have been identified by satellite imagery and global positioning system data in the Wajid Sandstone in Saudi Arabia. The main objective is to evaluate the importance of fractures for the overall flow behaviour in this fractured rock aquifer and to estimate in-situ hydraulic apertures. Data on fractures and lineaments were available for three outcrops. By applying a “cut-out” routine on the fracture endpoint data of these fracture trace windows, three deterministic discrete fracture networks (DFN), with an area of 100 m × 100 m, could be generated. These were used to simulate the fracture flow and to determine the hydraulic conductivity tensors. Using additional data on hydraulic pumping tests and matrix conductivities, in-situ hydraulic apertures could be determined. Average in-situ hydraulic apertures range from 1,300 to 1,700 µm. Observations from the field support these results. In addition, a hydraulic conductivity ratio between the matrix and fracture system was used to identify the contribution of the DFN to the overall fluid transport. A ratio of 10.4 was determined, which indicates that the effective flow behaviour in the Wajid Sandstone aquifer is not entirely dominated by the fracture system, though evidently strongly controlled by it.

Journal or Publication Title: Hydrogeology Journal
Volume: 18
Number: 7
Publisher: SpringerLink
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
Date Deposited: 27 Jan 2010 14:36
Official URL: https://link.springer.com/article/10.1007/s10040-010-0609-x
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