Method and system for marine seismic survey
AssigneeCggveritas Services SA
InventorThierry BRIZARD
Life of this patent
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Abstract
A buoy is configured to record seismic signals while underwater. The buoy includes a body; a buoyancy system configured to control a buoyancy of the body to descend multiple times to a predetermined depth (H) and then resurface with a controlled speed; and a seismic sensor located in the body and configured to record the seismic signals. The seismic sensor is instructed to record the seismic signals as the buoy travels up and down between the water surface and the predetermined depth.
Claims20
A buoy for recording seismic signals while underwater, the buoy comprising:
- a body;
- a buoyancy system configured to control a buoyancy of the body to descend multiple times to at least one predetermined depth (H) and then resurface with a controlled speed;
- and
- a seismic sensor located on the body and configured to record the seismic signals,
- wherein the seismic sensor is instructed to record the seismic signals as the buoy travels up and down between the water surface and the predetermined depth.
A system for conducting a marine seismic survey, the system comprising:
- plural buoys configured to record seismic signals when launched in water;
- a launching vessel configured to hold and launch the plural buoys along a given path;
- a recovery vessel configured to recover the plural buoys after the buoys have recorded the seismic signals at plural depths and times,
- wherein at least one buoy includes,
- a body,
- a buoyancy system configured to control a buoyancy of the body to descend multiple times to a predetermined depth (H) and then resurface with a controlled speed, and
- a seismic sensor located in the body and configured to record the seismic signals,
- wherein the seismic sensor is instructed to record the seismic signals as the buoy travels up and down between the water surface and the predetermined depth.
A method for recording seismic signals with buoys, the method comprising:
- instructing at least one buoy to move up and down between a predetermined depth and the water surface;
- recording the seismic signals with the at least one buoy at various depths between the predetermined depth and the water surface during a single trip;
- time-stamping the seismic signals;
- recording relative displacements, based on an input from an inertial system, of the at least one buoy between consecutive recordings;
- and
- calculating absolute positions of the at least one buoy based on the relative displacements.
A computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement a method for recording seismic signals with buoys, the method comprising:
- instructing at least one buoy to move up and down between a predetermined depth and the water surface;
- recording the seismic signals with the at least one buoy at various depths between the predetermined depth and a water depth close to the water surface during a single trip;
- time-stamping the seismic signals;
- recording relative displacements, based on input from an inertial system, of the at least one buoy between consecutive recordings;
- and
- calculating absolute positions of the at least one buoy based on the relative displacements.
Dependencies are inferred from the claim text.