Recovery Behaviour Of A Partly Illitized Sandstone Gas Reservoir

Diagenesis is defined as any chemical, physical or<br>biological change undergone by a sediment (rock)<br>after its initial deposition and during and after its<br>lithification, exclusive of surface alteration<br>(weathering) and metamorphism. The diagenetic<br>changes that occur in the rock result in the<br>alteration of some of the original petrophysical<br>properties of the rock. Porosity and permeability,<br>amongst others, have been established to be<br>altered by diagenesis.