Five ways to avoid storing source wavefield snapshots in 2D elastic prestack reverse time migration
Five ways to avoid storing source wavefield snapshots in 2D elastic prestack reverse time migration
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DOI：
10.1190/geo2014-0014.1
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发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
B. Nguyen;G. McMechan
中科院分区：
文献类型：
--
作者：
B. Nguyen;G. McMechan
ABSTRACTFive alternative algorithms were evaluated to circumvent the excessive storage requirement imposed by saving source wavefield snapshots used for the crosscorrelation image condition in 2D prestack elastic reverse time migration. We compared the algorithms on the basis of their ability, either to accurately reconstruct (not save) the source wavefield or to use an alternate image condition so that neither saving nor reconstruction of full wavefields was involved. The comparisons were facilitated by using the same (velocity-stress) extrapolator in all the algorithms, and running them all on the same hardware. We assumed that there was enough memory in a node to do an extrapolation, and that all input data were stored on disk rather than residing in random-access memory. This should provide a fair and balanced comparison. Reconstruction of the source wavefield from boundary and/or initial values reduced the required storage to a very small fraction of that needed to store source wavefield snapshots fo...
