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Elastic wave-equation datuming
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DOI：10.1190/GEO2017-0672.1.png)
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Wave-equation datuming (WED) techniques have demonstrated superiority when waves occur on the acquisition surface nonvertically, and traditional static corrections based on the time shift become inaccurate. Meanwhile, as for multicomponent data, those scalar techniques can hardly maintain the vector characteristics for the following multicomponent data processing flows. Considering this, we have developed an elastic-wave datuming approach to handle the static corrections for multicomponent data. Different from those existing scalar WED techniques, the multicomponent data are first decomposed into multicomponent P-and S-wave data. Then, the decomposed data are transformed into the f-k domain, and they are extrapolated from the acquisition surface to the datum using the one-way elastic-wave continuation. Finally, the datumed multicomponent data are reconstructed at the output datum by adding up the datumed P-and S-wave data. This elastic WED can guarantee that the same wave modes on different components are equally datumed, and the data remain multicomponent so that they are still applicable to multi-component-joint processing techniques. Finally, several test examples involved in this paper have proved our method's effectiveness in multicomponent data datuming application.
Keyword:
DEPTH MIGRATION
SEPARATION
DOMAIN
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