PART I: Modeling Theory and Practice
The goal of modeling is to elicit the seismic response of a subsurface structure. The plausibility of that structure is gauged by how well the form of the simulated reflection matches observed reflections. Correctly interpreting and mapping reflection structure, as opposed to depth structure, is therefore critical to the modeler’s ability to assess his results and derive the proper structural solution.
This chapter examines the meaning of reflection maps, shows how a reflection is organized in three dimensions, and explains how the map is constructed from various manifestations of the reflection, including diffractions and sideswipe. It also shows how the reflection map can be migrated in three dimensions, using inverse rays, to derive a depth structure which properly accounts for raypath bending and sideswipe. The procedure is termed map migration.