Geologic models of hydrocarbon reservoirs are routinely used in the petroleum industry for volumetric calculation, well planning, and flow-performance prediction. A geologic model is a computer-based representation of the reservoir's architecture and properties. Properties such as porosity and lithofacies are estimated at each cell in a geologic model using various estimation methods; the most common are geostatistical simulation, such as sequential-Gaussian simulation and sequential-indicator simulation (Goovaerts, 1997), which take into account the spatial continuity of the property and also honor its heterogeneity.

For many reservoirs, wells may be sparse, and well data alone are often insufficient to adequately constrain the...

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