Method for attenuating low frequency noise in a dual-sensor...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

Reexamination Certificate

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C702S014000, C702S016000, C702S018000, C702S023000, C702S024000, C702S025000, C367S015000, C367S021000, C367S024000

Reexamination Certificate

active

07957906

ABSTRACT:
A calculated vertical velocity sensor signal is determined from a recorded pressure sensor signal. A constructed vertical velocity sensor signal is determined as a linear combination of the calculated vertical velocity sensor signal and a recorded vertical velocity sensor signal in dual-sensor seismic streamer data, using a mixture coefficient as a proportionality constant. An upgoing pressure wavefield component is determined as one half of a difference of the recorded pressure sensor signal and the constructed vertical velocity sensor signal, as a function of the mixture coefficient. An error in the upgoing pressure wavefield component is determined by propagating errors in the recorded pressure sensor signal and constructed vertical velocity sensor signal terms. A value of the mixture coefficient is determined that minimizes the error in the upgoing pressure wavefield component.

REFERENCES:
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patent: WO 00/57207 (2000-09-01), None
patent: WO 2008/134177 (2008-11-01), None
patent: WO 2009/020719 (2009-02-01), None
A. Kemal Ozdemir, Philippe Caprioli, (Feb. 2008), “Optimized deghosting of over/under towed-streamer data in the presence of noise”, The Leading Edge, vol. 27, No. 2, pp. 190-199.
Sep. 16, 2009, PCT International Search Report.

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