Modelling with Zero-offset
Construct a post stack or zero-offset section using a compass
Know that seismic“dips”are defined by a, and geological dips by β
Understand modelling by summing diffractions, F-K methods, ray-tracing methods, and the exploding-reflector model
Use the“exploding reflector”model of 2-D data in (x, z) with the added dimension of time to define the 3-D volume with dimensions (x, z, t)
Figures & Tables
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.