Author(s)

A.M. Benali & L.W. de Backed

Abstract

Identifiability versus heterogeneity A.M. Benali," L.W. de Backed " Earth Sciences Institute, University of Oran., BP 16 Es Senia, Algeria * Unity of Agricultural Engineering, University of Louvain-la-neuve, B-1348, Belgium ABSTRACT Review of automatic history matching of reservoirs parameters in groundwater flow raises the problem of identiflability of aquifer systems. Lack of identiflability means that there exists parameters to which the heads are insensitive. From the guide- lines of the study of the homogeneous case, we inspect the identiflability of the transmissivity field of heteregeneous groundwater aquifers. These are derived from multiple realizations of a random function. We follow the identiflability of the transmissivity for each sample of the population N(O, Oy, c*y) through the measure of the sensivity of the local derivatives D^h = (d h /d T ). Results obtained from an an

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