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Pseudospectral 3-D Migration of Common-Offset Vector Gathers – Highly Parallel AlgorithmNormal access

Authors: V. Lisitsa, A. Pleshkevich, D. Vishnevskiy, V. Levchenko and B. Moroz
Event name: 80th EAGE Conference and Exhibition 2018
Session: Seismic Imaging - Theory II
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801345
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.08Mb )
Price: € 20

Summary:
We present an original parallel algorithm for pre-stack migration based on the simultaneous solution of one-way wave equation (OWE) with multiple right-hand sides by means of the pseudospectral method. Presented approach allows us to migrate common-offset vector gathers by OWE migration. The algorithm implies multi-level of parallelism with the OWE is solved on GPU (one GPU for each subset of right-hand sides), images are constructed on CPU and stored in RAM (one cluster node for each image). Thus the algorithm the same functionality as modern Kirchhoff-based approaches but higher resolution and ability to deal with complex models. In contrary with RTM-like procedures, our approach allows constructing common-offset vector seismic images directly.


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