Building a facies model ensures that the distribution of reservoir properties can be constrained to be consistent with geological expectation. It is also desirable that facies and property models are consistent with seismic data and rock physics understanding. This implies that the ideal modelling procedure must integrate various types of scale-dependent data within a variety of constraints. Geostatistical inversion offers a framework that is flexible enough to incorporate a wide range of data and constraints while also quantifying the associated uncertainty. In particular the ability to apply all constraints simultaneously, including facies and property distributions, leads to a more tightly integrated and thus more robust and consistent reservoir model. As facies are a key component of any reservoir model, it is essential that the definition of facies for modelling be adapted to be meaningful across all the domains of data being integrated.


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