Full text loading...
-
Accelerating 3D Prestack Reverse Time Migration by the GPU-based Parallel Pseudospectral Method
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Because of high accuracy,stability,wide dynamic range,and relatively low core memory costs for 3D wavefield computation,the pseudospectral (PS) method was an attractive alternative to other numerical modeling schemes,such as the finite-difference and the finite-element methods. But in recent years it is under disfavor due to its mediocre parallel performance. Fortunately, with the help of GPU we can perform PS to simulate wave propagation. The purpose of this paper is to develop a fast parallel PS based on GPU to speed up 3D Reverse Time Migration (RTM),which always requires large amount of calculation and storage. The new algorithm will be codes as a sequence of kernels that can be called from the host for each time step. In order to reduce the input/output interaction and disk storage, we adopt a hybrid strategy of source wavefield reconstruction method combined with checkpointing method. Application on the 3D SEG/EAGE Salt model demonstrates our method is effective and easy to implement.