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5: Dip-Moveout Correction and Prestack Migration

January 01, 2001


Dip-moveout (DMO) correction is applied to normal-moveout corrected prestack data to preserve conflicting dips with different stacking velocities during stacking. As a result, DMO correction yields an improved stacked section that is a closer representation of a zero-offset section compared to conventional CMP stack based on normal-moveout correction, only. This then enables us to apply the theory of zero-offset migration discussed in Chapter 4 to stacked data with greater confidence.

We remind ourselves from Chapter 3 that stacking velocities are dip-dependent (equation 3–8). When a flat event is intersected by a dipping event, we can only choose a stacking velocity in favor of one of these events, not both. Therefore, conventional CMP stacking does not equally preserve events with conflicting dips with different stacking velocities. This is not the case for a zero-offset section, for it contains all events, regardless of dip. Thus, in the presence of conflicting dips, a stacked section is not identical to a zero-offset section.

Since a CMP-stacked section strictly is not equivalent to a zero-offset section, we expect that migration after stack would not produce a crisp image in the presence of conflicting dips with different stacking velocities. To circumvent the problem of conflicting dips, it can be suggested that migration should be done before rather than after stack.

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Investigations in Geophysics

Seismic Data Analysis: Processing, Inversion, and Interpretation of Seismic Data

Öz Yilmaz
Öz Yilmaz
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Society of Exploration Geophysicists
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Publication date:
January 01, 2001




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