A robust gradient for long wavelength FWI updates

Jaime Ramos-Martinez; Sean Crawley; Kathy Zou; Alejandro Valenciano; Lingyun Qiu; Nizar Chemingui; Andrew Long

doi:10.1071/ASEG2016ab133

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa A robust gradient for long wavelength FWI updates
Authors Jaime Ramos-Martinez^a, Sean Crawley^b, Kathy Zou^c, Alejandro Valenciano^a, Lingyun Qiu^d, Nizar Chemingui^e and Andrew Long^f
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^a Petroleum Geo-Services Inc., West Memorial Place I 15375 Memorial Drive, Suite 100 Houston, , TX, , 77079, , USA, [email protected] ^b Petroleum Geo-Services Inc., West Memorial Place I 15375 Memorial Drive, Suite 100 Houston, , TX, , 77079, , USA, [email protected] ^c Petroleum Geo-Services Inc., West Memorial Place I 15375 Memorial Drive, Suite 100 Houston, , TX, , 77079, , USA, [email protected] ^d Petroleum Geo-Services Inc., West Memorial Place I 15375 Memorial Drive, Suite 100 Houston, , TX, , 77079, , USA, [email protected] ^e Petroleum Geo-Services Inc., West Memorial Place I 15375 Memorial Drive, Suite 100 Houston, , TX, , 77079, , USA, [email protected] ^f PGS Australia Pty Ltd, Level 4, IBM Centre 1060 Hay Street West Perth, , WA, , 6005, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2016ab133
- Published online: 01 Dec 2016

Abstract

We introduce a robust method to produce long wavelength updates in gradient-based Full Waveform Inversion (FWI). The solution introduces dynamic weights in the velocity sensitivity kernel derived from impedance and velocity parameterization of the classical objective function. The new kernel implementation effectively eliminates the migration isochrones produced by the specular reflections, enhances the low wavenumber components in the gradient in heterogeneous media, and is able to deliver velocity updates beyond the penetration depth of diving waves. We use synthetic examples to illustrate how this dynamic weighted FWI gradient successfully recovers the velocity from pre-critical reflections. We also show with dual-sensor streamer data from deep-water Gulf of Mexico how the dynamic weighted FWI gradient can combine both transmitted and reflected energy in a global FWI scheme.

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2016-12-01

2026-01-23

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References

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Zhou, W., Brossier, R., Operto, S., and Vireux, J., 2015, Full waveform inversion of diving waves for velocity model building with impedance inversion based on scale separation: Geophysical Journal International, 202, 1535-1554.
Zou, K., Ramos-Martinez, J., Kelly, S., Valenciano, A.A., Chemingui, N., and Lie, J., 2014, Refraction Full-waveform Inversion in a Shallow Water Environment: 76th Meeting, EAGE, Amsterdam, Extended Abstracts.

/content/journals/10.1071/ASEG2016ab133

Article Type: Research Article

Keyword(s): dynamic weights; FWI; resolution; RTM; velocity model

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