Velocity analysis using AB semblance
Geophysical Prospecting, 57 (3):
311--321 (мая 2009)DOI: 10.1111/j.1365-2478.2008.00741.x
Аннотация
I derive and analyse an explicit formula for a generalized semblance
attribute, which is suitable for the velocity analysis of prestack
seismic gathers with distinct amplitude trends. While the conventional
semblance can be interpreted as a squared correlation with a constant,
the AB semblance is defined as a correlation with a trend. This measure
is particularly attractive for analysing class II AVO anomalies and
converted waves. Analytical derivations and numerical experiments
show that the resolution of the AB semblance is approximately twice
as low as that of the conventional semblance. However, this does
not prevent it from being an effective attribute. I use synthetic
and field data examples to demonstrate the improvements in velocity
analysis from AB semblance.