Method for determining reservoir permeability from borehole...

G - Physics – 01 – V

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G01V 1/28 (2006.01) G01V 1/30 (2006.01)

Patent

CA 2612515

Method for determining reservoir permeability from Stoneley wave attenuation extracted from conventional sonic logs by inversion of the full Biot wave equations for a porous medium. Frequency-dependent Stoneley-wave attenuation is extracted by analyzing array sonic measurements. Then, based on Biot's full theory applied to a borehole model and the standard logs (gamma ray, caliper, density, neutron, resistivity, sonic, etc.), a simulation model with the same parameters as the Stoneley-wave measurements is built. Next, a theoretical Stoneley-wave attenuation is computed for a given permeability. Finally, reservoir permeability is determined by comparing the modeled Stoneley-wave attenuation with the measured Stoneley-wave attenuation by an iterative inversion process.

L'invention concerne un procédé de détermination de perméabilité de réservoir à partir de l'atténuation d'onde de Stoneley extraite des diagraphies soniques conventionnelles par inversion des équations d'ondes complètes de Biot pour milieu poreux. On extrait l'atténuation d'onde de Stoneley liée à la fréquence par analyse des mesures soniques matricielles. Puis, sur la base de la théorie complète de Biot appliquée à un modèle de trou de sonde et en utilisant les diagraphies standard (rayon gamma, jauge, densité, neutron, résistivité, sonique, etc.), on élabore un modèle de simulation avec les mêmes paramètres que les mesures d'onde de Stoneley. On calcule ensuite une atténuation d'onde de Stoneley théorique pour une perméabilité donnée. Enfin, on détermine la perméabilité de réservoir en comparant l'atténuation d'onde de Stoneley modélisée avec l'atténuation d'onde de Stoneley mesurée selon un processus itératif d'inversion.

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