** Next:** REFERENCES
** Up:** Tisserant and Biondi: Residual
** Previous:** Improving the estimation with

We have presented a method to estimate the error in the migration
velocity. It is based on the analysis of the residual
move-out in 3-D angle-domain common-image gathers.
The 3-D ADCIGs are functions of the aperture angle and the
reflection azimuth angle.
We tested a 2-D and a 3-D RMO function that led to an estimation of the
velocity error and made it possible to update the velocity model.
Because of 3-D events, the 2-D estimation of the velocity error
is not accurate enough.
The 3-D approach accounted for 3-D events and improved the
resolution of the error.
All the parameters required to estimate precisely the RMO
function (the dips of the reflectors, the azimuth of the
reflectors, and, to a minor extent, the reflection azimuth)
can be estimated from the migrated data.
The method can be automated and can serve as a basis for
migration velocity analysis.

** Next:** REFERENCES
** Up:** Tisserant and Biondi: Residual
** Previous:** Improving the estimation with
Stanford Exploration Project

5/23/2004