Multi-sensor system for airborne geophysical prospecting and method
AssigneeCgg Services SAS
InventorPhilip Miles
Life of this patent
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Abstract
A multi-sensor electromagnetic (EM) system and method for measuring gradients of EM signals. The multi-sensor EM system includes a frame; a transmitter device attached to the frame and configured to generate a primary EM field; a receiver device attached to the frame and configured to record a secondary EM field generated by the earth after being excited by the primary EM field; and a gradient sensor device attached to the frame and configured to record a gradient of the secondary EM field.
Claims11
A multi-sensor electromagnetic (EM) system for measuring EM signals, the multi-sensor EM system comprising:
- a frame;
- a transmitter device attached to the frame and configured to generate a primary EM field, the transmitter device including three transmitter coils perpendicular to each other;
- a receiver device attached to the frame and configured to record a secondary EM field generated by the earth after being excited by the primary EM field;
- a gradient sensor device attached to the frame and configured to record a gradient of the secondary EM field, the gradient sensor including at least one gradient coil having two parallel coils that sandwich one of the transmitter coils;
- and
- a controller attached to the frame and electrically connected to the transmitter device, the receiver device, and the gradient sensor device,
- wherein the controller instructs each of the three transmitter coils to generate a magnetic field with a given pulse repetition frequency.
A method for recording electromagnetic (EM) signals during an airborne EM survey, the method comprising:
- flying a multi-sensor EM system;
- generating a primary EM field with a transmitter device attached to a frame of the multi-sensor EM system, wherein a controller, which is attached to the frame, instructs each of three transmitter coils of the transmitter device to generate a magnetic field with a given pulse repetition frequency;
- recording with a receiver device attached to the frame, a secondary EM field generated by the earth after being excited by the primary EM field;
- and
- recording with a gradient sensor device attached to the frame, a gradient of the secondary EM field, wherein the gradient sensor includes at least one gradient coil having two parallel coils that sandwich one of the transmitter coils.
Dependencies are inferred from the claim text.