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Title: Large to intermediate-scale aquifer heterogeneity in fine-grain dominated alluvial fans (Cenozoic As Pontes, NW Spain): Insight based on 3D geostatistical reconstruction
Author: Falivene Aldea, Oriol
Cabrera, Lluís
Sáez, Alberto
Keywords: Visualització tridimensional
Serralada Cantàbrica
Conques sedimentàries
Fàcies (Geologia)
Three-dimensional display systems
Cantabrian Mountains
Sedimentary basins
Facies (Geology)
Issue Date: Aug-2007
Publisher: Springer Verlag
Abstract: Facies reconstructions are used in hydrogeology to improve the interpretation of aquifer permeability distribution. In the absence of sufficient data to define the heterogeneity due to geological processes, uncertainties in the distribution of aquifer hydrofacies and characteristics may appear. Geometric and geostatistical methods are used to understand and model aquifer hydrofacies distribution, providing models to improve comprehension and development of aquifers. However, these models require some input statistical parameters that can be difficult to infer from the study site. A threedimensional reconstruction of a kilometer scale fine-grain dominated Cenozoic alluvial fan derived from more than 200 continuously cored, closely spaced, and regularly distributed wells is presented. The facies distributions were reconstructed using a genetic stratigraphic subdivision and a deterministic geostatistical algorithm. The reconstruction is only slightly affected by variations in the geostatistical input parameters because of the highdensity data set. Analysis of the reconstruction allowed identification in the proximal to medial alluvial fan zones of several laterally extensive sand bodies with relatively higher permeability; these sand bodies were quantified in terms of volume, mean thickness, maximum area, and maximum equivalent diameter. These quantifications provide trends and geological scenarios for input statistical parameters to model aquifer systems in similar alluvial fan depositional settings.
Note: Versió postprint del document publicat a:
It is part of: Hydrogeology Journal, 2007, vol. 15, num. 5, p. 861-876
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ISSN: 1431-2174
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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