Post-stack Migration (Zero Offset)
Identify the three main methods of migration: Kirchhoff, FK, and downward continuation.
Estimate migration results with a compass.
Understand the principles behind Kirchhoff migration, and recognize the range of algorithms from very simple to complex.
Identify the features of FK migration and know how and why the parameters are defined.
Recognize the principles of downward continuation migration, distinguish between a time and depth migration, and identify different algorithms.
Know the difference between one pass and two-pass 3-D migration algorithms.
Recognize that all migration algorithms should be tested.
Figures & Tables
A Practical Understanding of Pre- and Poststack Migrations
This volume, SEG Course Notes Series No. 13, is designed to give the practicing geophysicist an understanding of the principles of poststack migration, presented with intuitive reasoning rather than laborious math. Modeling is introduced as a natural process that starts with a geologic model and then builds seismic data. Migration is then described as the reverse process that uses seismic data to find the geologic model. Many other topics are covered relating to the quality of the migrated section, such as aliasing, rugged topography, or use of the correct velocity. Significant new material has been added in this revised edition of the original 1997 book, especially algorithms based on the phase-shift method, such as PSPI and the omegaX method.