For optimising production from an oil reservoir, limits of reservoir bollies and distribution of heterogeneities within these bodies must be well understood. Realistic models of these heterogeneities can then lead to realistic prediction of flow. The lack of detailed data is unfortunately a major obstacle to the construction of such models. Well data are scarce, and quantitative geological information, such as that derived from outcrop studies, may be difficult to extrapolate to the reservoir under study. This situation has led to the development of stochastic modelling techniques, based on geostatistical simulation. Uncertainties are accounted for, by generating a family of "possible" images, honouring well data and statistical constraints, such as variograms or histograms of various reservoir properties.


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