Marine electromagnetic measurement system
AssigneeSchlumberger Technology Corporation
InventorsUgo Conti, Edward Nichols
Life of this patent
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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 a electromagnetic measurement system. Magnetic fields are then measured at the same location.
Claims70
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;
- and
- at least one of an electrode coupled to each of the arms and at least two magnetometers coupled to the arms.
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;
- and
- at least one of an electrode and a magnetometer coupled to each of the arms.
A sea-floor electromagnetic measurement device for obtaining underwater measurements of earth formations, comprising:
- a central structure;
- at least one arm, having a first and 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.
A method of undertaking sea-floor electromagnetic measurements, the method comprising:
- measuring electric fields at a location a selected distance from a central structure of a electromagnetic measurement system;
- and
- measuring components of magnetic fields proximate the same location.
Dependencies are inferred from the claim text.