The main goal of this project (NSF-EAR1919650, DE-FE0031544) is to develop a full waveform inversion method to map subsurface seismic attenuation properties using seismic data.
| Wave propagation with NO attenuation | Wave propagation with attenuation |
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Seismic attenuation causes seismic wave propagation with amplitude loss and phase velocity dispersion. This coupled attenuation physics is essential and embedded in the waveform. To correct for these amplitude loss and dispersion effects in the waveform data, we develop a new wave equation (Zhu and Harris, 2014; Xing and Zhu, 2019) to represent these effects with clear physics. More interestingly, our derivation can represent amplitude loss and phase dispersion separately in the wave equation. The below figure shows you the accuracy of physics simulated by newly derived wave equations and theoretical predictions.
A sketch illustration of the multiscale structure of porous rocks with patchy saturation.
The topology of such a patchy saturation model with fractal fluid distribution can be represented by a generalized fractal model below:
Publications:
Xing G. and Zhu T., Seismic attenuation estimation through integrating Hessian in multiparameter viscoacoustic full waveform inversion, Geophysics, in review (Oct 2023)
Huang C., Zhu T., and Xing G., (2023), Monitoring dynamic evolution of CO2 plumes during geological sequestration using data assimilated visco-acoustic full-waveform inversion, Geophysics., https://doi.org/10.1190/geo2021-0804.1
Xing G., Zhu T., (2023) Compensating the attenuation effects in the full waveform inversion with dissipation-dispersion decoupling, Geophysics, https://doi.org/10.1190/geo2022-0614.1
Wang N., Xing G., and Zhu T., (2022), Propagating seismic waves in anisotropic attenuating media using fractional viscoelastic wave equation, Journal of Geophysical Research: Solid Earth, PDF
Xing G., and Zhu T., (2022), Decoupled Fréchet kernels based on a fractional viscoacoustic wave equation, Geophysics 87: T61-T70. https://doi.org/10.1190/geo2021-0248.1
Xing G., and Zhu T., (2022), “Decoupled Fréchet kernels based on a fractional viscoacoustic wave equation,” Geophysics 87: T61-T70. https://doi.org/10.1190/geo2021-0248.1
Xing G., and Zhu T., (2021), A viscoelastic model for seismic attenuation using fractal mechanical network, Geophys. J. Int, 224(3),1658–1669. https://doi.org/10.1093/gji/ggaa549
Xing G. and Zhu T., (2019) Modeling frequency-independent Q viscoacoustic wave propagation in heterogeneous media, Journal of Geophysical Research: Solid Earth, 124(11), 11568-11584 https://doi.org/10.1029/2019JB017985, PDF
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