View source for Aspects of DMO correction — a summary

{{SDA publication 
 | title   = Seismic Data Analysis
 | image   = [[File:Seismic-data-analysis.jpg|frameless|180px]]
 | width   = 120px
 | series  = Investigations in Geophysics
 | part    = 
 | chapter = 
 | frompg  =
 | topg    =
 | author  = [[Öz Yilmaz]]
 | doi     = 10.1190/1.9781560801580
 | pdf     = 
 | store   = http://shop.seg.org/OnlineStore/ProductDetail/tabid/177/Default.aspx?ProductId=847
 | isbn    = ISBN 978-1-56080-094-1
}}

We discussed the principles of DMO correction and studied its practical aspects using synthetic and field data. It now is appropriate to compile aspects of DMO correction.

# The process of dip-moveout corrects for the dip effect on stacking velocities.
# Thus, it preserves conflicting dips with different stacking velocities during [[CMP stacking]].
# The DMO stack, therefore, is a closer representation of a zero-offset section as compared to a conventional CMP stack based on [[normal-moveout correction]], only.
# The DMO stack can then be migrated using a zero-offset [[migration]] algorithm with greater accuracy.
# Conflicting dips with different stacking velocities give rise to multivalued velocity picks from velocity spectra. [[Velocity analysis]] of DMO-corrected data alleviates this problem and increases the accuracy of picking an unambiguous velocity function from a velocity spectrum.
# Velocities estimated from DMO-corrected data are dip independent; therefore, they are more suitable to derive a [[migration]] velocity field as compared to velocities estimated from data without DMO correction.
# [[Dip-moveout correction]] actually is a process of partial [[migration]] before stack. Specifically, it maps normal-moveout-corrected data to normal-incidence reflection points in the subsurface. As a result, midpoint coordinate is variant under DMO correction.
# As a direct consequence of aspect (g), DMO correction removes the reflection point dispersal associated with nonzero-offset recording in the presence of dipping reflectors.
# Following DMO correction, [[Prestack time migration|prestack data]] can be migrated so as to create CMP gathers in their migrated position. This then enables us to conduct [[velocity analysis]] to derive a [[migration]] velocity field with greater confidence.
# Finally, the CMP gathers from prestack time [[migration]] of DMO-corrected data can be used for amplitude variation with offset analysis.

In this chapter, we discussed the dip-moveout process within the context of 2-D seismic data. Three-dimensional aspects of DMO correction are discussed in [[processing of 3-D seismic data]].

==See also==
*[[Salt flanks]]
*[[Fault planes]]
*[[DMO and multiples]]
*[[DMO and coherent linear noise]]
*[[Other considerations]]

==External links==
{{search}}

[[Category: Dip-moveout correction and prestack migration]]
[[Category: Dip-moveout correction in practice]]