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US 7,974,152 B2Granted
Control system for marine vibrators and seismic acquisition system using such control system
AssigneePGS Geophysical AS
InventorStig Rune Lennart Tenghamn
Life of this patent
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Abstract
A method for controlling output of a marine seismic vibrator includes operating the vibrator using a predetermined driver signal. A vibrator output signal is measured at at least two different places on the vibrator. The at least two measured vibrator output signals are used to determine a corrected driver signal, wherein the corrected driver signal results in fewer harmonics of fundamental frequencies in the vibrator output. The vibrator is operated using the corrected driver signal.
Claims22
A method for controlling output of a marine seismic vibrator, comprising:
- operating the vibrator using a predetermined driver signal, the vibrator having a substantially elliptical outer radiating surface in contact with a body of water;
- measuring a vibrator output signal at least one end beam supporting each longitudinal end of the radiating surface and in a middle of the radiating surface;
- using the at least two measured vibrator output signals to determine a corrected driver signal, wherein the corrected driver signal results in fewer harmonics of fundamental frequencies in the vibrator output;
- and
- operating the vibrator using the corrected driver signal.
2 more elements
A method for marine seismic surveying, comprising:
- deploying at least one marine vibrator and a plurality of seismic sensors in a body of water above an area of the subsurface to be evaluated;
- operating the vibrator using a predetermined driver signal, the vibrator having a substantially elliptical outer radiating surface in contact with the water;
- measuring a vibrator output signal at least one end beam supporting each longitudinal end of the radiating surface and in a middle of the radiating surface;
- using the at least two measured vibrator output signals to determine a corrected driver signal, wherein the corrected driver signal results in fewer harmonics of fundamental frequencies in the vibrator output;
- operating the vibrator using the corrected driver signal;
- and
- detecting seismic energy at the plurality of seismic sensors.
4 more elements
Dependencies are inferred from the claim text.