| 摘要 |
PCT No. PCT/FR95/01345 Sec. 371 Date Jun. 18, 1996 Sec. 102(e) Date Jun. 18, 1996 PCT Filed Oct. 13, 1995 PCT Pub. No. WO94/12484 PCT Pub. Date Oct. 19, 1994A method of analysing and processing seismic reflection data for the determination of a high resolution spatial hyperbolicity correction velocity field. The method is characterised in that: for the set of normal moveout-corrected gathers, the maximum values of the positive and negative residues of the NMO correction are determined: a time range analysis is determined located on either side of a time t0 and of which the width is equal to not more than twice the absolute value of the maximum residual moveout, a family of 2n+1 residual correction hyperbolas or parabolas are constructed, each having its apex centered on said time t0 and, at the value of the maximum offset, presenting a value of time that is equal to one of the 2n+1 equidistant time values predetermined on the analysis range, and including the value t0 and the extreme values of said analysis range, 2n+1 sets of static corrections are determined for each of the offsets, defined by the time differences presented relative to said time t0 on the 2n+1 residual moveout correction hyperbolas or parabolas, for each gather, and successively to each of the traces and for each hyperbola or parabola, the static correction associated with the offset trace is applied, and the statically corrected traces are stacked together in order to obtain a set of 2n+1 stacked traces characterising correction velocity field. |
