Method for attenuating particle motion sensor noise in dual sensor towed marine seismic streamers
First Claim
1. A method for processing seismic data from a towed marine seismic streamer having particle motion sensors and pressure sensors, comprising:
- scaling signals detected by the particle motion sensors to match signals detected by the pressure sensors;
combining the pressure sensor signals and the scaled particle motion sensor signals to generate up-going and down-going pressure wavefield components;
extrapolating the up-going and down-going pressure wavefield components to a position just below a water surface;
applying a first matching filter to the extrapolated down-going pressure wavefield component; and
subtracting the matching filtered extrapolated down-going pressure wavefield component from the extrapolated up-going pressure wavefield component, generating an up-going pressure wavefield component with particle motion sensor noise attenuated with a cosine filter.
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Abstract
Signals detected by particle motion sensors in a towed dual sensor marine seismic streamer are scaled to match signals detected by pressure sensors in the streamer. The pressure sensor signals and the scaled particle motion sensor signals are combined to generate up-going and down-going pressure wavefield components. The up-going and down-going pressure wavefield components are extrapolated to a position just below a water surface. A first matching filter is applied to the extrapolated down-going pressure wavefield component. The filtered down-going pressure wavefield component is subtracted from the extrapolated up-going pressure wavefield component, generating an up-going pressure wavefield component with attenuated particle motion sensor noise. A second matching filter is applied to the extrapolated up-going pressure wavefield component. The filtered up-going pressure wavefield component is subtracted from the extrapolated down-going pressure wavefield component, generating a down-going pressure wavefield component with attenuated particle motion sensor noise.
38 Citations
18 Claims
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1. A method for processing seismic data from a towed marine seismic streamer having particle motion sensors and pressure sensors, comprising:
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scaling signals detected by the particle motion sensors to match signals detected by the pressure sensors; combining the pressure sensor signals and the scaled particle motion sensor signals to generate up-going and down-going pressure wavefield components; extrapolating the up-going and down-going pressure wavefield components to a position just below a water surface; applying a first matching filter to the extrapolated down-going pressure wavefield component; and subtracting the matching filtered extrapolated down-going pressure wavefield component from the extrapolated up-going pressure wavefield component, generating an up-going pressure wavefield component with particle motion sensor noise attenuated with a cosine filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification