Fluvial heterogeneities have been modelled for the highly heterogeneous Ness Formation of a field in the North Sea, using a marked point stochastic process. This paper describes the geological modelling and the flow simulation work done. The uncertainty in the geological parameters is large and of vital importance to the production of the formation. Therefore stochastic modelling has been applied to evaluate different sedimentological hypothesis by varying the input model parameters. Via upscaling and flow simulation the effect on reservoir behaviour has been quantified and better understanding of the geological uncertainty obtained.

Stochastic modelling is a bridge between geologists and reservoir engineers. The reservoir models are easily changed in a geologically consistent way giving better history match. This integrated modelling project led to technical developments in the modelling tool in order to improve the results.

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