In a parallel article submitted to Geophysics, I have outlined the derivation of size and shape for Fresnel zones as a function of offset and velocity gradient. The fundamental conclusion of this analysis is that the Fresnel zone computed using a zero-offset assumption and constant velocity is a poor representation of the "area of influence" of the Fresnel zone in a practical sense. The relevance and practical application of these Fresnel zone sizes is described in terms of current "binning" in 3D seismic (particularly marine 3D), and the Fresnel zone analysis leads to an alternate method of assessing adequate coverage in a 3D survey.
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