Marine electromagnetic measurement system
First Claim
1. A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations, comprising:
- a central structure;
a plurality of arms having a first end and a second end, the second end pivotally coupled to the central structure, the first end being a free end;
at least one electrode coupled to each of the arms; and
at least two magnetometers coupled to ones of the arms, wherein the magnetometers are positioned a selected distance from the central structure so that magnetic fields produced by electric currents in the central structure do not substantially affect the measurements made by the magnetometers.
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Accused Products
Abstract
A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations including a central structure and arms attached to the central structure so that they can pivot relative to the central structure. An electrode is attached to the end of each of the arms or to the central structure, and/or magnetometers are attached to the arms. A method for undertaking sea-floor electromagnetic measurements of earth formations including measuring electric fields at a selected distance from a central structure of an electromagnetic measurement system. Magnetic fields are then measured at the same location.
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Citations
67 Claims
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1. A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations, comprising:
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a central structure;
a plurality of arms having a first end and a second end, the second end pivotally coupled to the central structure, the first end being a free end;
at least one electrode coupled to each of the arms; and
at least two magnetometers coupled to ones of the arms, wherein the magnetometers are positioned a selected distance from the central structure so that magnetic fields produced by electric currents in the central structure do not substantially affect the measurements made by the magnetometers. - 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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23. A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations, comprising:
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a central structure;
a plurality of arms having a first end and a second end, the second end pivotally coupled to the central structure, the first end being a free end; and
at least one of an electrode and a magnetometer coupled to each of the arms; and
wherein the magnetometer is positioned a selected distance from the central structure so that magnetic fields produced by electric currents in the central structure do not substantially affect the measurements made by the magnetometer. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations, comprising:
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a central structure;
at least one arm, having a first end and a second end, the second end pivotally coupled to the central structure, the first end being a free end; and
at least one of an electrode and a magnetometer, coupled to the at least one arm; and
wherein the magnetometer is positioned a selected distance from the central structure so that magnetic fields produced by electric currents in the central structure do not substantially affect the measurements made by the magnetometer. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. A method of undertaking sea-floor electromagnetic measurements, the method comprising:
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measuring components of magnetic fields at a location a selected distance from a central structure of an electromagnetic measurement system so that magnetic fields produced by electric currents in the central structure substantially do not affect the measurements made by a magnetometer; and
measuring electric fields proximate the same location. - View Dependent Claims (66, 67)
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Specification