True-Amplitude Common-Offset, Common-Azimuth v(z) Migration

P066 TRUE-AMPLITUDE COMMON-OFFSET COMMON-AZIMUTH V(Z) MIGRATION 1 YU ZHANG 1 SAMUEL H. GRAY 2 and JERRY YOUNG 1 1 Veritas DGC Inc. 10300 Town Park Drive Houston TX 77072 USA 2 Veritas DGC Inc. Calgary Summary We investigate the amplitude behavior of nonzero-offset phase-shift migration in two and three dimensions. By transforming phase-shift migration into an equivalent Kirchhoff migration we find the deviation of the phase-shift migration operator from “true-amplitude.” We also investigate the amplitude error introduced by anti-aliasing for both phase-shift and Kirchhoff migration. Even for fairly routine acquisition characteristics this amplitude error can dominate the error due to