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METHODS AND SYSTEMS THAT DETERMINE A VELOCITY WAVEFIELD FROM A MEASURED PRESSURE WAVEFIELD

  • US 20160061973A1
  • Filed: 05/18/2015
  • Published: 03/03/2016
  • Est. Priority Date: 08/29/2014
  • Status: Active Grant
First Claim
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1. A method that determines a velocity wavefield from a measured pressure wavefield indicative of properties of a subterranean formation, the method comprising:

  • computing an approximate frozen free-surface profile of a free surface above a streamer based on pressure data generated by pressure sensors located at receiver locations along the streamer, the pressure data represents the measured pressure wavefield;

    computing reflectivity and normal derivative of the reflectivity at the receiver locations;

    computing a normal derivative of the measured pressure wavefield at the receiver locations based on the reflectivity and the normal derivative of the reflectivity at the receiver locations; and

    computing an approximate normal-velocity wavefield at the receiver locations along the streamer based on the normal derivative of the measured pressure wavefield at the receiver locations, the approximate normal-velocity wavefield does not include low-frequency, streamer vibrational noise.

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