Patent ID: 6546339
Filing Date: 2003-04-08
Classification: G01V

Abstract:
A geophysical velocity analysis method comprising the steps of:a) establishing a seismic data set and a velocity model corresponding to a seismic exploration volume; b) generating a set of angle-domain common image gathers for the volume from the seismic data set and the velocity model; c) for each of the gathers, generating a plurality of moveout paths z corresponding to a plurality of residual velocity values, wherein each of the moveout paths corresponds to a residual velocity value &Dgr;v according to an angle-domain residual moveout equation z=z0&it;1-p2&af;(v^+Î”&it;â€ƒ&it;v)21-p2&it;v^2,â€ƒwherein p is a ray parameter, z0=z(0) is a zero-angle depth, and {circumflex over (v)} is a trial velocity corresponding to said each of the gathers; d) selecting a best-fit residual velocity value from the plurality of residual velocity values, the best-fit residual velocity value corresponding to a best-fit moveout path; and e) updating the velocity model using the best-fit residual velocity value.