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Porosity and permeability reduction and enhancement in nature are ultimately the cumulative result of physical and chemical processes acting on a given volume of rock. These processes are constrained by the fundamental physical-chemical variables of Pressure (P), Temperature (T), Time (t), and Composition (X). Composition is taken to include not only the chemical composition of the rock expressed as mineralogy but also fluid chemistry and such textural variables as size, sorting, roundness, sphericity, orientation, and packing. Porosity, at any given time for a given unit of rock at depth, is controlled by the complex interaction of these variables.

Predictive...

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