Pseudospectral 3-D Migration of Common-Offset Vector Gathers – Highly Parallel Algorithm
Vadim V. Lisitsa, Alexander L. Pleshkevich, D. Vishnevskiy, Vadim Dmitrievich Levchenko, B. Moroz · Proceedings · 2018
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.