Frequency-dependent processing and interpretation (fdpi) of...

G - Physics – 01 – V

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

Patent

CA 2445883

A method for identifying, imaging and monitoring dry or fluid-saturated underground reservoirs (fig 1A) using seismic waves reflected from target porous or fractured layers is set forth. Seismic imaging the porous or fractured layer occurs by low pass filtering (fig 13B) of the windowed reflections from the target porous or fractured layers leaving frequencies below low-most corner (or full width at half maximum) of a recorded frequency spectra. Additionally, (fig 13C) the ratio of image amplitudes is shown to be approximately proportional to reservoir permeability, viscosity of fluid, and the fluid saturation of the porous or fractured layers.

La présente invention concerne un procédé permettant d'identifier, d'imager et de surveiller des réservoirs souterrains secs ou saturés de fluide (Fig .1A) en utilisant les ondes sismiques renvoyées par des couches cibles poreuses ou fracturées. Pour effectuer l'imagerie sismique des couches poreuses ou fracturées, on réalise un filtrage passe-bas (Fig. 13B) des réflexions en fenêtres des couches cibles poreuses ou fracturées, tout en abandonnant les fréquences inférieures au coin le plus bas (ou en largeur complète à moitié du maximum) d'un spectre de fréquences enregistrées. En outre, (Fig. 13C) le rapport entre amplitudes d'images s'avère approximativement proportionnel à la perméabilité du réservoir, à la viscosité du fluide, et à la saturation en fluide des couches poreuses ou fracturées.

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