Converted-Wave Prestack Imaging and Velocity Analysis by Pseudo-Offset Migration

L-12 CONVERTED-WAVE PRESTACK IMAGING AND VELOCITY ANALYSIS BY PSEUDO-OFFSET MIGRATION WEIZHONG WANG and LONG D. PHAM Summary A new technique for converted-wave (Cwave) prestack imaging and velocity analysis is presented. This technique called pseudo-offset migration (POM) differs from equivalent-offset migration (EOM) (Bancroft et al. 1998) in how the migration mapping offset is defined. In this paper we show that POM is less dependent on the initial velocity than EOM and can produce better images and C-wave velocities than P- S DMO plus poststack migration. Introduction Converted-wave processing is more difficult than pure-mode processing. A simple common-conversion-point stack requires an input