Method for determining electromagnetic survey sensor orientation
First Claim
1. A method for determining orientation of an electromagnetic survey sensor deployed at a selected position, comprising:
- inducing an electromagnetic field at a selected position above a portion of the Earth'"'"'s subsurface to be surveyed;
detecting a portion of the electromagnetic field along at least two substantially orthogonal directions at the sensor position, the portion of the field having traveled only in a substantially vertical plane including the inducing position and the detecting position;
determining a polarization direction of the portion of the electromagnetic field from the detected portion; and
using the determined polarization direction to determine the orientation of the sensor.
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Accused Products
Abstract
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.
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Citations
22 Claims
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1. A method for determining orientation of an electromagnetic survey sensor deployed at a selected position, comprising:
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inducing an electromagnetic field at a selected position above a portion of the Earth'"'"'s subsurface to be surveyed; detecting a portion of the electromagnetic field along at least two substantially orthogonal directions at the sensor position, the portion of the field having traveled only in a substantially vertical plane including the inducing position and the detecting position; determining a polarization direction of the portion of the electromagnetic field from the detected portion; and using the determined polarization direction to determine the orientation of the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification