--> Investigations of Variability and Spatial Conditions of the Sedimentary Facies at a Quaternary Aquifer in Jutland, Denmark, by P. Gravesen; #90986 (1994).

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Abstract: Investigations of Variability and Spatial Conditions of the Sedimentary Facies at a Quaternary Aquifer in Jutland, Denmark

Peter Gravesen

In eastern Jutland, Denmark a multilayered Quaternary aquifer is situated in a deep valley eroded into fine-grained Tertiary clays. The aquifer complex consists of meltwater sands and gravels confined by sandy, clayey tills. Fine-grained meltwater clays and clayey tills are also interlayered between at least three major aquifers. The sediments are often displaced by glacial tectonics. The aquifer complex is supposed to comprise deposits from the Menapian to the Weichselian. The description of the sedimentary facies is based on well samples and interpretation of the depositional environments. This information and information from geophysical surveys are the basis for a 3-dimensional geological model of the aquifer complex which demonstrates a spatial picture of the heterogeneities of t e sediments. The degree of geological variability is scale dependent, and the description comprises parameters from large-scale tectonics to small-scale permeability. The description of the geological model is improved by geostatistical processing of the well data, the geophysical data and the interpretations based on these data. Stochastic modelling is used for the interpolation of the known hard data. This also preserves the variability of the original data and thereby describes the heterogeneity of the aquifer. Several simulations are carried out on chosen units which gives a multitude of interpretation possibilities for the spatial relationship of the sedimentary units and evaluation of the hydraulic conditions of the aquifer.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994