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Methods and systems that determine a velocity wavefield from a measured pressure wavefield

  • US 10,444,386 B2
  • Filed: 05/18/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 08/29/2014
  • Status: Active Grant
First Claim
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1. In a process for generating an image of a subterranean formation using marine seismic techniques in which one or more sources are activated to generate acoustic energy that is reflected from the subterranean formation and recorded as pressure data by pressure sensors located in one or more streamers, the specific improvement 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 based on the approximate frozen free-surface profile;

    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;

    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; and

    generating an image of the subterranean formation based at least in part on the measured pressure wavefield and the approximate normal-velocity wavefield.

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