Permeability is perhaps one of the most important yet elusive reservoir properties. Unlike porosity, it correlates poorly with the elastic properties of rocks and, as a result, cannot be mapped remotely. Rather, it has to be directly measured in the lab on core plugs extracted from a well. In such lab experiments, a pressure gradient is applied to a fluid-filled rock sample, the fluid's volume flux is recorded, and the absolute permeability is calculated from Darcy's law by relating the flux to the pressure gradient.

Physical experiments may be augmented or even partially replaced by numerical experiments provided that a...

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