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Geological Society, London, Special Publications; 1998; v. 134; p. 325-337;
DOI: 10.1144/GSL.SP.1998.134.01.15
© 1998 Geological Society of London

Swiss, German and Austrian Molasse Basin

Reservoir analogue modelling of sandy tidal sediments, Upper Marine Molasse, SW Germany, Alpine foreland basin

J. Zweigel

Institut für Geologie und Paläontologie, Universität Tübingen, Sigwartstrasse 10, D-72076 Tübingen, Germany

An outcrop of sandy tidal sediments (Überlingen, Lake Constance) was studied and modelled using the computer-program HERESIM. The distribution of 12 lithofacies types was mapped on photo-panels. Facies-proportion curves and variograms were calculated and used as input parameters for the simulations. Simulations with varying numbers and positions of pseudo-wells showed that already one well is sufficient to achieve a good reservoir image, due to the simple layercake-like arrangement of lithofacies types at the scale of the outcrop (125 m x 15 m). Further, a detailed geostatistical analysis of tidal sandwave deposits revealed a complex, but surprisingly systematic internal structure. Single crossbedded bodies were classified according to their size, foreset orientation, and geometry. The geostatistical analysis revealed vertical alternations of the dominant current direction (ebb and flood) and of the size of cross beds, which could be related to changes in accommodation space.