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| Titel |
Some improvements in subbasalt imaging using pre-stack depth migration |
| VerfasserIn |
I. Flecha, R. Carbonell, R. W. Hobbs, H. Zeyen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 2, no. 1 ; Nr. 2, no. 1 (2011-01-03), S.1-7 |
| Datensatznummer |
250000447
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| Publikation (Nr.) |
 copernicus.org/se-2-1-2011.pdf |
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| Zusammenfassung |
| Subbasalt imaging can be improved by carefully applying pre-stack
depth migration. Pre-stack depth migration requires a detailed
velocity model and an accurate traveltime calculation. Ray tracing
methods are fast but, often fail in calculating traveltimes in
complex models, specially, when they feature high velocity
contrasts. Finitte difference solutions of the eikonal are more
stable and can produce a traveltime field for the whole model
avoiding shadow zones. A synthetic test was carried out to check the
performance of a new pre-stack depth migration algorithm in a model
that features a high velocity layer surrounded by lower velocities.
The results reasonably reproduce the original model. The same scheme
was used to process long-offset reflection data from the Faroe Shelf
where conventional techniques (stack) were insufficient to assess
the structure under a basalt layer. Pre-stack depth migration
produced an improved image which recovered the main features in the
stacked section and allowed to identify some subbasalt coherent
events. |
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