PermeabilityPermeability Alteration CIRF.B Simulation of the Piceance Basin, Colorado. Permeability is determined from the sediment composition and texture. The very low permeability of the lower-lying sediments reflects their shaly composition compared to the more permeable overlying sandy units (or sediments). Also shown is the change through time--20 million years (top) to 40 million years (bottom).


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