We demonstrate an application of isotropic elastic Full-Waveform Inversion (FWI) to a field data set of Vertical Seismic Profiles (VSP) from a structurally complex narrow anticline in Northern Iraq. A practical elastic FWI workflow is developed to invert offset VSP seismic data. Synthetic tests indicate that this approach can give accurate wave speed updates for the target anticlinal structure. We use inverted wave speed models to perform elastic Reverse-Time Migration (RTM) of the data. The RTM results show that the shear wave speed (VS) image has a higher resolution than the compressional speed (VP) image for the target structure, owing to the presence of interpretable P-to-S converted waves. The results of the field test show that elastic FWI produces elastic models from which we obtain clear VS images of the thrust fault of interest.
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SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy
September 26–October 1, 2021
Denver, Colorado, USA and online
Elastic full-waveform inversion of VSP data from a complex anticline in northern Iraq
Frederik J. Simons;
Frederik J. Simons
Princeton University
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Jeroen Tromp
Jeroen Tromp
Princeton University
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Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, Denver, Colorado, USA and online, September 2021.
Paper Number:
SEG-2021-3582871
Published:
October 30 2021
Citation
Liu, Zhaolun, Hoffmann, Jürgen, Simons, Frederik J., and Jeroen Tromp. "Elastic full-waveform inversion of VSP data from a complex anticline in northern Iraq." Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, Denver, Colorado, USA and online, September 2021. doi: https://doi.org/10.1190/segam2021-3582871.1
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