3D migration on the Cray X-MP
Thesis/Dissertation
·
OSTI ID:7204004
Implementation on the Cray X-MP of 3D migration algorithms derived from the Phase Shift method is presented. Due to the enormous amount of data to process, 3D migration algorithms are very demanding in I/O resources and CPU time. A package of subroutines, called Slice-4, has been designed in order to offer an efficient scheme to store and retrieve data from disk to main memory. Efficiency is achieved through an appropriate storage scheme, asynchronism and parallelism in the data transfers. The implementation of the Phase Shift migration algorithm using Slice-4 is described. This algorithm assumes the absence of lateral variations in the velocity field and is thus not appropriate for the migration of complicated geological structures. A new algorithm, called the Phase Shift Plus Correction (PSPC) method is presented. In this algorithm, which takes into account lateral velocity variations, the migration is performed through a two steps process. In the first step, a downward extrapolation is performed using the Phase Shift algorithm and a constant velocity. In the second step, a correction term is introduced.
- Research Organization:
- Houston Univ., TX (USA)
- OSTI ID:
- 7204004
- Country of Publication:
- United States
- Language:
- English
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