From reservoir exploration to field abandonment, reservoir modeling plays a central role in understanding and predicting the reservoir key geologic, geophysical, and engineering components. Reservoir models, either as a simple layer cake or as a complex, fully 3D description of structural components, rock and fluid properties, are ideal gateways for aggregating data and expertise from different sources and disciplines. The complexity of such models should be driven by the practical reservoir management question raised, be it the estimation of OOIP (reserve question) or the development and planning of wells/surface facilities and recovery strategies (flow question). At the same time, the limitation of reservoir models should be well understood: reservoir models can only mimic the reservoir's true complexity; they can never fully (nor need they) represent the actual subsurface heterogeneity.

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