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Abstract

Summary

To deal with subsurface complicated structures, spatially irregular grids are often applied to improve modeling accuracy. As for rough topography, mapping from computational domain to irregular physical domain is often adopted to conform to nonplanar surface. In this paper, we adopt interface-adaptive irregular grid to deal with irregular subsurface interfaces and rugged topography simultaneously without using coordinates transformation. We develop local grid node adjustment strategy based on boundary nodes selection method and incorporate irregular grid FD sheme for acoustic FD modeling. Numerical modeling examples illustrate that our irregular grid FD scheme can reduce grid diffraction noise and improve fidelity of simulated seismogram. We also apply this method in prestack reverse-time migration (RTM) and obtain better results compared with ordinary regular grid.

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/content/papers/10.3997/2214-4609.201412698
2015-06-01
2024-04-20

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References

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Acoustic Finite-difference Modeling on Locally Adjusted Grid in the Presence of Rugged Topography
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201412698
/content/papers/10.3997/2214-4609.201412698
/content/papers/10.3997/2214-4609.201412698
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