


 Residualmoveout analysis in presence of strong lateral velocity anomalies  

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Residualmoveout analysis in presence of strong lateral velocity anomalies
Biondo Biondi
Biondo Biondi
Biondo Biondi
Abstract:
The analysis of a simple synthetic data set recorded above
a strong velocity anomaly and a flat reflector illustrates
the challenges that can be encountered when performing
residualmoveout analysis using a family of curves
described by a single parameter.
Overcoming these challenges is important if we want to use automatic velocity
analysis methods that rely on the derivative of the stack power with
respect to the residualmoveout parameter to compute velocity gradients.
My analysis shows how,
at some reflector locations,
the stackpower may have a poorly defined peak because
the residual moveout is more complex than the oneparameter model assumes.
At other reflector locations, the peak of the stackpower is
sharp but it is too far from the value of the parameter
corresponding to no residual moveout.
Consequently, the derivatives are unreliable,
and possibly have even the wrong sign.
More robust information could be provided by migrating data
with lower frequencies, when available.
A more general solution is smoothing the stack power
along the residualmoveout parameter before evaluating its derivatives.



 Residualmoveout analysis in presence of strong lateral velocity anomalies  

Next: Introduction
Up: Reproducible Documents
20110524