Method for determining the evolution of pharmacological petrophysical of a rock in the course of the diagenesis

摘要

- Method for quantitatively determining the evolution of the permeability and porosity of a porous medium during the diagenèse. - it defines a scenario diagenèse as well as an initial structure of the network of pores of the porous medium. We construct a representation of the network of pores by means of a model pnm. Then, for each step of the scenario of diagenèse, the following steps are performed: it determines the concentration of ions to the walls of the pores and channels of the model pnm, for the precipitation reaction, or dissolution as a function of the scenario, and it is deduced therefrom a variation of the geometry of the model pnm. For the model pnm thus modified, it calculates the porosity of geometrical manner and the permeability from the law of darcy. These steps are reiterated as a function of the scenario of diagenèse. Finally, it deduces therefrom a relationship between the permeability of the porous medium and the porosity of the porous medium during the diagenèse. - application in particular to the use of oil deposits.