TY - JOUR
T1 - Robust surface-wave full-waveform inversion
AU - Borisov, Dmitry
AU - Gao, Fuchun
AU - Williamson, Paul
AU - Simons, Frederik J.
AU - Tromp, Jeroen
N1 - Funding Information:
We thank Total E&P Research and Technology for providing financial support and computational resources. In particular, we thank Bertrand Duquet, Isabella Masoni, and Jean-Luc Boelle for fruitful discussions. Special thanks go to Total Austral for permission to publish this work and data provision during the project.
Publisher Copyright:
© 2019 SEG
PY - 2019/8/10
Y1 - 2019/8/10
N2 - Estimation of subsurface seismic properties is important in civil engineering, oil & gas exploration, and global seismology. We present a method and an application of robust surface-wave inversion in the context of 2D elastic waveform inversion of an active-source onshore dataset acquired on irregular topography. The lowest available frequency is 5 Hz. The recorded seismograms at relatively near offsets are dominated by dispersive surface waves. In exploration seismology, surface waves are generally treated as noise (“ground roll”) and removed as part of the data processing. In contrast, here, we invert surface waves to constrain the shallow parts of the shear wavespeed model. To diminish the dependence of surface waves on the initial model, we use a layer-stripping approach combined with an envelope-based misfit function. Surface waves are initially inverted using short offsets (up to 0.6 km) and over a high-frequency range (12.5–15 Hz) to constrain the shallow parts of the model. The lower-frequency components and longer offsets, which can sample deeper parts of the model, are gradually added to the process as the inversion proceeds. At the final stage, surface waves are inverted using offsets of up to 1.5 km over a band between 5–15 Hz. The final Vs model includes high-resolution features in the near surface, and shows good agreement with results from dispersion-curve analysis. The data fit is also greatly improved.
AB - Estimation of subsurface seismic properties is important in civil engineering, oil & gas exploration, and global seismology. We present a method and an application of robust surface-wave inversion in the context of 2D elastic waveform inversion of an active-source onshore dataset acquired on irregular topography. The lowest available frequency is 5 Hz. The recorded seismograms at relatively near offsets are dominated by dispersive surface waves. In exploration seismology, surface waves are generally treated as noise (“ground roll”) and removed as part of the data processing. In contrast, here, we invert surface waves to constrain the shallow parts of the shear wavespeed model. To diminish the dependence of surface waves on the initial model, we use a layer-stripping approach combined with an envelope-based misfit function. Surface waves are initially inverted using short offsets (up to 0.6 km) and over a high-frequency range (12.5–15 Hz) to constrain the shallow parts of the model. The lower-frequency components and longer offsets, which can sample deeper parts of the model, are gradually added to the process as the inversion proceeds. At the final stage, surface waves are inverted using offsets of up to 1.5 km over a band between 5–15 Hz. The final Vs model includes high-resolution features in the near surface, and shows good agreement with results from dispersion-curve analysis. The data fit is also greatly improved.
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U2 - 10.1190/segam2019-3215047.1
DO - 10.1190/segam2019-3215047.1
M3 - Conference article
AN - SCOPUS:85119082350
SN - 1052-3812
SP - 5005
EP - 5009
JO - SEG Technical Program Expanded Abstracts
JF - SEG Technical Program Expanded Abstracts
T2 - Society of Exploration Geophysicists International Exposition and 89th Annual Meeting, SEG 2019
Y2 - 15 September 2019 through 20 September 2019
ER -