Method for removing air wave effect from offshore frequency...

Details Method for removing air wave effect from offshore frequency... Method for removing air wave effect from offshore frequency...

G - Physics

01

V

G01V 3/12 (2006.01)

Patent

CA 2526266

A method for removing the air wave effect from offshore frequency domain controlled source electromagnetic survey data. The region of interest is modeled with (111) and without (113) a top air layer. The electromagnetic field due to the source is computed at the survey receiver positions for each source position for both models. The difference between the fields computed (116) from the two models is the air wave effect, which is then subtracted (117) from the field data for the corresponding source-receiver geometry.

L'invention concerne un procédé servant à éliminer l'effet d'onde aérienne de données de levé électromagnétiques à source commandée obtenues dans le domaine fréquentiel en mer. La zone intéressante est modélisée avec (111) une couche atmosphérique supérieure et sans (113) cette couche. Le champ électromagnétique dû à la source est calculé au niveau des positions récepteur de levé pour chaque position source, pour les deux modèles. La différence entre les champs calculés (116) à partir des deux modèles est l'effet d'onde aérienne que l'on soustrait (117) alors des données de champ pour la géométrie source-récepteur correspondante.

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