Marine passive seismic method for direct hydrocarbon detection

G - Physics – 01 – V

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G01V 1/30 (2006.01)

Patent

CA 2723159

A method for detection of hydrocarbon bearing formations below the bottom of a body of water from seismic signals includes moving a plurality of spatially distributed seismic sensors in a body of water and detecting seismic signals including response to any seismic energy having frequencies down to proximate zero. The method includes stacking the acquired seismic signals from the plurality of the sensors in both longitudinal and transverse directions with respect to motion of the sensors in the body water. The stacked signals are analyzed for presence of passive seismic energy indicative of hydrocarbon bearing formations below the bottom of the body of water.

L'invention concerne un procédé destiné à détecter des formations renfermant des hydrocarbures sous le fond dune étendue deau à partir de signaux sismiques, le procédé comportant létape consistant à déplacer une pluralité de capteurs sismiques spatialement répartis dans une étendue deau et à détecter des signaux sismiques comprenant une réponse à une éventuelle énergie sismique dont les fréquences peuvent descendre jusquà être proches de zéro. Le procédé comporte en outre létape consistant à superposer les signaux sismiques acquis à partir de la pluralité de capteurs à la fois dans les directions longitudinale et transverse par rapport au mouvement des capteurs dans létendue deau. Les signaux superposés sont analysés pour établir la présence dénergie sismique passive, indicative de formations renfermant des hydrocarbures sous le fond de létendue deau.

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