Stack-power maximization in practice

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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


The method of stack-power maximization can yield better stack compared to the method of traveltime decomposition in areas with poor signal-to-noise ratio. Figure 3.3-44 shows a CMP-stacked section along a land profile with field statics corrections applied (Figure 3.3-45). While the left-half of the section has a good signal-to-noise ratio, the right-half has a poor signal-to-noise ratio resulting from irregular topography and near-surface complexity (Figure 3.3-45). Note, for instance, the loss of continuity along the reflection events at 0.8 and 1.3 s at the right-half of the section.

Selected CMP gathers shown in Figure 3.3-46 verify the presence of short-wavelength statics. Following residual statics corrections by stack-power maximization and the subsequent velocity analysis, the same gathers indicate that short-wavelength statics have been largely resolved (Figure 3.3-46), and thus, the resulting CMP stack shows significant improvement in the continuity of reflections in the right-hand side (Figure 3.3-47). The shot and receiver residual static shifts derived by using the supertrace scheme described above are shown in Figure 3.3-48. Note that mainly large residuals are in the right-half of the profile with irregular topography.

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Stack-power maximization in practice
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