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28 October 1996 Three-dimensional prestack preserved amplitude migration: application to a 3D real dataset
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We present algorithms based on ray + Born approximation for 2.5 D and 3D prestack preserved amplitude migration (PPAM) of seismic reflection data. The Green's functions are estimated by dynamic ray tracing in 2D or 3D heterogeneous smooth velocity fields with a wavefront construction method. The algorithms were implemented on a Sparc 20 workstation and special attention was paid to CPU efficiency and low RAM storage. We give some basic idea for optimization and present some applications on synthetic and real datasets. For the 2D version about 10 Mbytes RAM and 10 minutes CPU time are needed for the migration of a marine line, using 300 shots with 120 receivers. For the 3D algorithm, about 48 Mbytes RAM and a weak CPU time are needed for migrating a 3D marine survey using 29 lines consisting of ca. 500 shots with 240 receivers (13 Gbytes).
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Philippe Thierry, Gilles Lambare, Pascal Podvin, and Mark Noble "Three-dimensional prestack preserved amplitude migration: application to a 3D real dataset", Proc. SPIE 2822, Mathematical Methods in Geophysical Imaging IV, (28 October 1996);

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