Method for Bispectral Picking of Anelliptical NMO Correction Parameters

摘要

Method of determining the velocity V and anellipticity η parameters for processing seismic traces in a common midpoint (CMP) gather comprising:—a preliminary step to define a plurality of nodes (dtn, τ_o), for each node (dtn, τ_o) defined in the preliminary step, the following steps:—for static NMO correction of traces in the CMP gather as a function of the values of the said parameters dtn and τ_o at the node considered, and calculation of the semblance function associated with the said NMO correction for the node considered; and—for each picked time t_o, a step including determination of the maximum semblance node (dtn (t_o), τ_o (t_o)),—and a final step to convert the dtn (t_o) and τ_o (t_o) parameters, so as to obtain the velocity t_o) and anellepticity η (t_o) laws.