Poststack processing

From SEG Wiki
Jump to: navigation, search
Seismic Data Analysis
Seismic-data-analysis.jpg
Series Investigations in Geophysics
Author Öz Yilmaz
DOI http://dx.doi.org/10.1190/1.9781560801580
ISBN ISBN 978-1-56080-094-1
Store SEG Online Store


A typical poststack processing sequence includes the following steps:

  1. Deconvolution after stack (field data examples) is usually applied to restore high frequencies attenuated by CMP stacking. It also is often effective in suppressing reverberations and short-period multiples. Figure 1.5-21 shows the CMP stack as in Figure 1.5-20 after spiking deconvolution.
  2. Although not included in the processing sequence for the Caspian data example in this section, often, time-variant spectral whitening (the problem of nonstationarity) is used to further flatten the spectrum and accounts for the time-variant character of the source waveform.
  3. Time-variant band-pass filtering (the 1-D Fourier transform) is then used to remove noise at the high- and low-frequency end of the signal spectrum (Figure 1.5-22).
  4. The basic processing sequence sometimes includes a step for attenuation of random noise uncorrelated from trace to trace (noise and multiple attenuation).
  5. Finally, some type of display gain is applied to the stacked data (Figure 1.5-23). For true amplitude preservation, time-variant scaling of stacked amplitudes is avoided; instead, a relative amplitude compensation function that is constant from trace to trace is applied. This is a slow time-varying gain function that amplifies weak late reflections without destroying the amplitude relationships from trace to trace that may be caused by subsurface reflectivity.

See also

External links

find literature about
Poststack processing
SEG button search.png Datapages button.png GeoScienceWorld button.png OnePetro button.png Schlumberger button.png Google button.png AGI button.png