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Modeling Acoustic Wave Propagation in Variable Density Media with a New Efficient Stencil
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Compared with standard staggered grid (SSG) method, equivalent staggered grid (ESG) is a memory saving method which can be used for propagating acoustic wave in variable density media. However, it takes more computational cost than SSG. Although optimizing the finite-difference (FD) coefficients can be one way to enhance the efficiency and accuracy, designing new FD stencil can be another fundamental way. In this paper, we propose a new equivalent staggered-grid (NESG) stencil which greatly enhances the efficiency without decreasing accuracy. We deduce the FD coefficients by Taylor-series expansion and least square methods respectively and compare the accuracy with SSG. Dispersion analysis and numerical examples show the superiority of our new stencil for modelling wave propagation in acoustic variable density media.