| Popis: |
Seismic traces of time-migrated sections have its amplitudes distributed along image rays when properly converted to depth. Image rays and its corresponding orthogonal lines, constitute a coordinate system, in such a way that time-to-depth conversion problems can be addressed as coordinate transformation problems. In depth-to-time conversion, vertical lines in depth are mapped into curves in time. Because of the analogy with image rays in depth, we suggest the term model rays to refer to these curves in time. We present two differential equations which permit to trace model rays and its corresponding orthogonal lines. We implement two approaches to trace model rays, one based on paraxial ray-tracing theory and the other on wavefront construction by Huygens principle. Finally, we demonstrate how to use model rays to correlate seismic data with well information. |
