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Exact Wavefield Reconstruction on Finite-difference Grids with Minimal Memory Requirements
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
Wavefield injection in finite-difference grids can be described by the method of multiple point sources. Synthetically generated wavefields and wavefield constituents can be reconstructed in a volume from recordings on a surface surrounding the volume itself by using a combination of monopole and dipole sources. We show how to record surface wavefields at the right location and how to properly implement point sources in staggered finite-difference grids of arbitrary order of spatial accuracy. Only one or two surface wavefields are required to reconstruct the original wavefields or wavefield constituents to machine precision. We show the application of the method for the separation of up- and downgoing wavefields and for source wavefield reconstruction for reverse-time migration. Our implementation enables accurate wavefield reconstruction with minimal memory requirements.