METHOD OF DETERMINING THE EVOLUTION OF PETROPHYSICAL PROPERTIES OF A ROCK DURING DIAGENESIS
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United States of America Patent
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Issued Date -
Jun 24, 2010
app pub date -
Dec 10, 2009
filing date -
Dec 18, 2008
priority date (Note) -
Abandoned
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Abstract
A method for quantitative determination of the permeability and porosity evolution of a porous medium during diagenesis having application to oil reservoir development is disclosed. A diagenesis scenario and an initial structure of the pore network of the porous medium are defined.A representation of the pore network is constructed by a PNM model. The steps of the diagenesis scenario are determining the ion concentration on the pore and channel walls of the PNM model, for a precipitation or dissolution reaction according to the scenario, and deducing therefrom a geometry variation of the PNM model, the porosity is calculated geometrically and the permeability is calculated from Darcy's law for the modified PNM model; the foregoing steps are repeated according to the diagenesis scenario and a relationship is deduced between the permeability of the porous medium and the porosity of the porous medium during diagenesis.
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