Numerical Simulation of Diagenetic Alteration and its Effect on Residual Gas in Tight Gas Sandstones

Masa Prodanovic and Steven Bryant

 The geometry of intergranular pore space in tight gas sandstones (at the porosities less than 10%) differs from conventional reservoir sandstones in some fundamental aspects: the fluid pathways are significantly narrower so that pore body/pore throat aspect ratios are larger, and some percentage of the fluid pathways are closed and disconnect the pore space.

 This profoundly affects macroscale fluid properties and is the reason for failure of conventional porosity-permeability relationship models. We numerically investigate the influence of cementation of intergranular pore spaces.