Reference : Modeling the effect of clay drapes on pumping test response in a cross-bedded aquifer...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/133709
Modeling the effect of clay drapes on pumping test response in a cross-bedded aquifer using multiple-point geostatistics
English
Huysmans, Marijke [Katholieke Universiteit Leuven - KUL > Department of Earth and Environmental Sciences > Applied Geology and Mineralogy > >]
Dassargues, Alain mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Hydrogéologie & Géologie de l'environnement >]
11-Jul-2012
Journal of Hydrology
Elsevier Science
450-451
159-167
Yes (verified by ORBi)
International
0022-1694
[en] Groundwater Flow ; Multiple-point geostatistics ; Upscaling ; Cross-bedding ; Pumping test ; Heterogeneity
[en] This study investigates whether fine-scale clay drapes can cause an anisotropic pumping test response at a much larger scale. A pumping test was performed in a sandbar deposit consisting of cross-bedded units composed of materials with different grain sizes and hydraulic conductivities. The measured drawdown values in the different observation wells reveal an anisotropic or elliptically-shaped pumping cone. The major axis of the pumping ellipse is parallel with the strike of cm to m-scale clay drapes that are observed in several outcrops. To determine (1) whether this large-scale anisotropy can be the result of fine-scale clay drapes and (2) whether application of multiple-point geostatistics can improve interpretation of pumping tests, this pumping test is analyzed with a local 3D groundwater model in which fine-scale sedimentary heterogeneity is modelled using multiple-point geostatistics. To reduce CPU and RAM demand of the multiple-point geostatistical simulation step, edge properties indicating the presence of irregularly-shaped surfaces are directly simulated. Results show that the anisotropic pumping cone can be attributed to the presence of the clay drapes. Incorporating fine-scale clay drapes results in a better fit between observed and calculated drawdowns. These results thus show that fine-scale clay drapes can cause an anisotropic pumping test response at a much larger scale and that the combined approach of multiple-point geostatistics and cell edge properties is an efficient method for integrating fine-scale features in larger scale models.
Aquapôle - AQUAPOLE
Fonds Wetenschappelijk Onderzoek - FWO
Researchers ; Professionals
http://hdl.handle.net/2268/133709
10.1016/j.jhydrol.2012.05.014
http://www.sciencedirect.com/science/article/pii/S0022169412003800
The final paper can be found directly on Science Direct : http://www.sciencedirect.com/science/article/pii/S0022169412003800

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publi223acceptedpaper.pdfThe final paper can be found directly on Science Direct : http://www.sciencedirect.com/science/article/pii/S0022169412003800Author postprint773.1 kBView/Open

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