Poststack velocity analysis by separation and imaging of seismic diffractions

Sergey Fomel*, Evgeny Landa, M. Turhan Taner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Small geologic features manifest themselves in seismic data in the form of diffracted waves, which are fundamentally different from seismic reflections. Using two field-data examples and one synthetic example, we demonstrate the possibility of separating seismic diffractions in the data and imaging them with optimally chosen migration velocities. Our criteria for separating reflection and diffraction events are the smoothness and continuity of local event slopes that correspond to reflection events. For optimal focusing, we develop the local varimax measure. The objectives of this work are velocity analysis implemented in the poststack domain and high-resolution imaging of small-scale heterogeneities. Our examples demonstrate the effectiveness of the proposed method for high-resolution imaging of such geologic features as faults, channels, and salt boundaries.

Original languageEnglish
Pages (from-to)U89-U94
JournalGeophysics
Volume72
Issue number6
DOIs
StatePublished - 2007
Externally publishedYes

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