Shallow Water Demultiple

Shallow Water Demultiple (SWD) provides improved results for multiple attenuation where water depths are too shallow to apply SRME directly. In shallow water, the waterbottom reflection needed by SRME to predict multiples may not be recorded with sufficient fidelity.

Click to compare

Without SWD

With SWD

Difference

SWD is data-driven and uses the information from multiples in the data for predicting and removing water layer multiples.

Features and Benefits

  • In shallow water, creates a model of the waterbottom from the multiples in the data
  • Uses the waterbottom model to predict all waterbottom-related multiples in the data
  • Multiple model can be adaptively subtracted
  • Provides superior demultiple over SRME where recorded waterbottom is indistinct, e.g. shallow water
  • Attenuates higher order low frequency multiples where the wavelets overlap, making Tau-p deconvolution difficult
  • Can be used in combination with other demultiple techniques

These example displays are from offshore China. The first waterbottom multiple is about 40ms below the primary. Higher order multiples are lower in frequency so wavelets overlap, making difficult attenuation by deconvolution. SWD successfully attenuates both the first order and higher order multiples.

Shallow Water Demultiple using hybrid multich...

Kunlun Yang | Barry Hung
©2013 EAGE

Shallow water demultiple with seafloor reflec...

Kunlun Yang | Barry Hung
©2012 SEG

Workflow For Surface Multiple Attenuation In ...

Barry Hung | Kunlun Yang
Subsurface Imaging

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