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Next: Acknowledgments Up: Fomel: Velocity analysis using Previous: Field data example


If one interprets the conventional semblance as a correlation with a constant, the $ AB$ semblance is a correlation with an amplitude trend. I have derived an explicit expression for the $ AB$ semblance and analyzed it to quantify the observable loss of resolution. I have demonstrated the advantages of the $ AB$ semblance attribute using synthetic and field data examples. The ratio of the $ AB$ and conventional semblances serves as a useful AVO indicator attribute. The sensitivity of this attribute to non-linear variations in the amplitude trend can be a subject of further research. Further applications may also include velocity analysis of converted waves and seismic diffractions.