Method for determining electromagnetic survey sensor...

G - Physics – 01 – V

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G01V 3/12 (2006.01)

Patent

CA 2741011

A method for determining orientation of an electromagnetic survey sensor includes deploying the sensor at a selected position on the bottom of a body of water. An electromagnetic field is generated at a selected position in the body of water. A portion of the electromagnetic field is detected along at least two orthogonal directions at the sensor. A portion of the detected electromagnetic field is selected as having traveled only in a vertical plane which includes both source position and sensor position. The polarization direction of the selected portion of the electromagnetic field is determined from the selected portion. The determined polarization direction is used to determine the sensor orientation.

La présente invention concerne un procédé permettant de déterminer l'orientation d'une sonde pour relevés électromagnétiques et consistant à déployer la sonde en un point sélectionné du fond d'un plan d'eau. En l'occurrence, on génère un champ électromagnétique en un point sélectionné du plan d'eau. On détecte une partie du champ électromagnétique selon au moins deux axes orthogonaux passant par la sonde. On sélectionne la partie du champ électromagnétique détecté ramenée à un plan vertical passant par la source et la sonde. À partir de la partie sélectionnée on détermine la direction de polarisation de la partie de champ électromagnétique sélectionnée. La direction de polarisation ainsi obtenue permet de déterminer l'orientation de la sonde.

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