Method and system for increasing fold to streamer length ratio

G - Physics – 01 – V

Patent

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G01V 1/38 (2006.01)

Patent

CA 2261789

A method and system are provided for use in marine seismic data surveys to increase fold and offset without increasing streamer length or drag on the streamer boat. Generally the method comprises the use of a second source boat positioned in the streamer path and firing the second source (S2) at a time before the recording of information from the first source (S1) is finished. By positioning the second source (S2) about one streamer length in front of the closest hydrophone (R1), the fold is increased by two for the same length streamer.

L'invention a trait à un procédé, ainsi qu'au dispositif correspondant, utilisables dans le domaine des relevés de données sismiques marines, permettant de multiplier les réflexions sismiques et d'accroître l'écart sans augmenter la longueur de la flûte sismique ou de la traîne sur le navire. Le procédé consiste généralement à faire intervenir un second navire source placé sur la trajectoire de la flûte sismique et à mettre en action cette seconde source (S2) avant la fin de l'enregistrement des données en provenance de la première source (S1). En plaçant la seconde source (S2) à environ une longueur de flûte en avant de l'hydrophone (R1) le plus proche, on multiplie par deux les réflexions sismiques et ce, en conservant la même longueur de flûte.

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