Effects of surface scattering in full-waveform inversion
In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. Asynthetic study was performed to investigate the effects of this simplification. In terms of size and frequency, the test model and data conform to a real long-offset surv...
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Massachusetts Institute of Technology. Earth Resources Laboratory
2012
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| Online Access: | http://hdl.handle.net/1721.1/68593 |
| _version_ | 1811072128833814528 |
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| author | Bleibinhaus, Florian Rondenay, Stephane |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Bleibinhaus, Florian Rondenay, Stephane |
| author_sort | Bleibinhaus, Florian |
| collection | MIT |
| description | In full-waveform inversion of seismic body waves, often
the free surface is ignored on grounds of computational efficiency.
Asynthetic study was performed to investigate the effects
of this simplification. In terms of size and frequency, the
test model and data conform to a real long-offset survey of the
upper crust across the San Andreas fault. Random fractal
variations are superimposed on a background model with
strong lateral and vertical velocity variations ranging from
1200 to 6800 m/s. Synthetic data were computed and inverted
for this model and different topographies. A fully viscoelastic
time-domain code was used to synthesize the seismograms,
and a viscoacoustic frequency-domain code was utilized to
invert them. The inversion was focused on early arrivals,
which are dominated by P-waves but also contain strong
P-Rayleigh wave conversions from the near-field of the receiver.
Resulting waveform models show artifacts and a loss
of resolution from neglecting the free surface in the inversion,
but the inversions are stable, and they still improve the
resolution of kinematic models. The extent of deterioration
depends more on the subsurface than on the surface structure.
Inversion results were improved at no additional expense by
introducing a weak contrast along a staircase function above
shots and receivers. |
| first_indexed | 2024-09-23T09:01:22Z |
| id | mit-1721.1/68593 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:01:22Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/685932019-04-10T20:16:40Z Effects of surface scattering in full-waveform inversion Bleibinhaus, Florian Rondenay, Stephane Massachusetts Institute of Technology. Earth Resources Laboratory Bleibinhaus, Florian Rondenay, Stephane Scattering FWI In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. Asynthetic study was performed to investigate the effects of this simplification. In terms of size and frequency, the test model and data conform to a real long-offset survey of the upper crust across the San Andreas fault. Random fractal variations are superimposed on a background model with strong lateral and vertical velocity variations ranging from 1200 to 6800 m/s. Synthetic data were computed and inverted for this model and different topographies. A fully viscoelastic time-domain code was used to synthesize the seismograms, and a viscoacoustic frequency-domain code was utilized to invert them. The inversion was focused on early arrivals, which are dominated by P-waves but also contain strong P-Rayleigh wave conversions from the near-field of the receiver. Resulting waveform models show artifacts and a loss of resolution from neglecting the free surface in the inversion, but the inversions are stable, and they still improve the resolution of kinematic models. The extent of deterioration depends more on the subsurface than on the surface structure. Inversion results were improved at no additional expense by introducing a weak contrast along a staircase function above shots and receivers. Shell International Exploration and Production B.V. 2012-01-17T16:36:30Z 2012-01-17T16:36:30Z 2009-12-17 http://hdl.handle.net/1721.1/68593 Earth Resources Laboratory Industry Consortia Annual Report;2010-17 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Scattering FWI Bleibinhaus, Florian Rondenay, Stephane Effects of surface scattering in full-waveform inversion |
| title | Effects of surface scattering in full-waveform inversion |
| title_full | Effects of surface scattering in full-waveform inversion |
| title_fullStr | Effects of surface scattering in full-waveform inversion |
| title_full_unstemmed | Effects of surface scattering in full-waveform inversion |
| title_short | Effects of surface scattering in full-waveform inversion |
| title_sort | effects of surface scattering in full waveform inversion |
| topic | Scattering FWI |
| url | http://hdl.handle.net/1721.1/68593 |
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