3D ray+Born migration/inversion—Part 1: Theory
| Autor: | Pascal Podvin, Gilles Lambaré, Stéphane Operto, Philippe Thierry |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Offset (computer science)
010504 meteorology & atmospheric sciences Computation Inversion (meteorology) Prestack Inverse problem 010502 geochemistry & geophysics 01 natural sciences Geophysics Data acquisition Geochemistry and Petrology Ray tracing (graphics) Image resolution Algorithm 0105 earth and related environmental sciences Mathematics |
| Zdroj: | GEOPHYSICS. 68:1348-1356 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/1.1598128 |
| Popis: | Prestack ray+Born migration/inversion can be split in two steps : the computation of common image gathers (CIGs) and their weighted stack (the migration stack). The choice of the domain for the CIGs (shot, offset, angle, etc.) has a direct impact on the resolution of the migration stack. This resolution can be studied easily in the frame of ray+Born migration/inversion theory resulting into improved migration/inversion formulas according to the acquisition geometry. This paper is devoted to this analysis in the cases of a simple 2D acquisition and of a 3D swath acquisition, both corresponding to classical data sets from the SEG/EAGE 3D overthrust experiment. We show that the migration formula originally designed for 3D marine acquisition is not adaptable to the 3D swath acquisition. Finally, we propose a new formula for this specific acquisition, which improves the resolution of the final migrated image. The relevance of this new formula is illustrated in the frame of the SEG/EAGE experiment in the companion paper. |
| Databáze: | OpenAIRE |
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