TTI equivalent medium parametrization method for the seismic waveform modelling of heterogeneous media with coarse grids
- 9 August 2021
- journal article
- research article
- Published by Oxford University Press (OUP) in Geophysical Journal International
- Vol. 227 (3), 2016-2043
- https://doi.org/10.1093/gji/ggab310
Abstract
In recent years, many higher-order and optimized schemes have been developed to reduce the dispersion error with the use of large grid spacing in finite-difference seismic waveform simulations. However, there are two problems in the application of coarse grids for heterogeneous media: the generation of artefact diffraction from the stair-step representation of non-planar interfaces and the inaccuracy of the calculated waveforms due to the interface error. Several equivalent medium parametrization approaches have been proposed to reduce the interface error of the finite-difference method in heterogeneous media. However, these methods are specifically designed for the standard (2,4) staggered-grid scheme and may not be accurate enough for coarse grids when higher-order and optimized schemes are used. In this paper, we develop a tilted transversely isotropic equivalent medium parametrization method to suppress the interface error and the artefact diffraction caused by the staircase approximation under the application of coarse grids. We use four models to demonstrate the effectiveness of the proposed method, and analyse the accuracy of each seismic phase related to the interface. The results show that our method can be used with higher-order and optimized schemes at 3 points per wavelength and produce satisfactory results.Funding Information
- National Key Research and Development Program of China (2018YFC1504204)
- Southern Marine Science and Engineering Guangdong Laboratory (GML2019ZD0203)
- Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology (ZDSYS20190902093007855)
- Shenzhen Science and Technology Program (KQTD20170810111725321)
This publication has 58 references indexed in Scilit:
- Numerical simulation of seismic waves in models with anisotropic formations: coupling Virieux and Lebedev finite-difference schemesComputational Geosciences, 2012
- On specific features of the Lebedev scheme in simulating elastic wave propagation in anisotropic mediaNumerical Analysis and Applications, 2011
- Lebedev scheme for the numerical simulation of wave propagation in 3D anisotropic elasticity‡Geophysical Prospecting, 2010
- Misfit Criteria for Quantitative Comparison of SeismogramsBulletin of the Seismological Society of America, 2006
- 3D Heterogeneous Staggered-Grid Finite-Difference Modeling of Seismic Motion with Volume Harmonic and Arithmetic Averaging of Elastic Moduli and DensitiesBulletin of the Seismological Society of America, 2002
- Large-scale simulation of elastic wave propagation in heterogeneous media on parallel computersComputer Methods in Applied Mechanics and Engineering, 1998
- Numerical simulation of interface waves by high-order spectral modeling techniquesThe Journal of the Acoustical Society of America, 1994
- Dispersion-Relation-Preserving Finite Difference Schemes for Computational AcousticsJournal of Computational Physics, 1993
- Difference analogues of orthogonal decompositions, basic differential operators and some boundary problems of mathematical physics. IUSSR Computational Mathematics and Mathematical Physics, 1964
- Elastic waves at the surface of separation of two solidsProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1924