Method for providing uniform subsurface coverage in the...

G - Physics – 01 – V

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G01V 1/38 (2006.01) G01V 1/02 (2006.01) G01V 1/20 (2006.01) G01V 1/28 (2006.01)

Patent

CA 2188255

A method for minimizing non-uniform insonification of subsurface formations in the presence of steep dips (F) when advancing a swath of elongated parallel seismic streamer cables (13) along a line of survey. A first acoustic source (SL) is stationed at the leading end of the swath and a second source (ST) is stationed at the trailing end of the swath. The sources (SL, ST) are activated in alternative cycles at preselected timed intervals (20, 29) to provide down-dip and up-dip seismic data sets. The data sets are processed and merged to eliminate objectionable shadow zones.

L'invention porte sur un procédé permettant de réduire à son minimum une pénétration non uniforme par ultrasons de formations de subsurface en présence de forts pendages (F), en faisant avancer un faisceau de câbles (13) de traîne sismique de forme allongée et parallèles le long d'une ligne de sondage. Une première source acoustique (SL) est placée sur l'extrémité avant du faisceau et une seconde source (ST), sur l'extrémité arrière du faisceau. On active les sources (SL, ST) par cycles alternés selon des intervalles de temps préétablis (26, 29) afin d'obtenir des jeux de données sismologiques sur l'aval-pendage et l'amont-pendage. On traite et on fusionne ces jeux de données afin d'éliminer des zones d'ombre inopportunes.

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