Reducing Sub-Messinian Uncertainty in Offshore Egypt Using Time-lag FWI with Narrow-azimuth Towed-streamer Data

S. Ghose; Y. Liu; J. Gillespie; R. Lyons; A. Searle; H. Su; F. Gao; N. Ladeb

doi:10.3997/2214-4609.202536016

Reducing Sub-Messinian Uncertainty in Offshore Egypt Using Time-lag FWI with Narrow-azimuth Towed-streamer Data
Authors S. Ghose¹, Y. Liu², J. Gillespie¹, R. Lyons¹, A. Searle¹, H. Su², F. Gao² and N. Ladeb²
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¹ Chevron ² Viridien
Publisher: European Association of Geoscientists & Engineers
Source: Conference Proceedings, Fifth EAGE Eastern Mediterranean Workshop, Dec 2025, Volume 2025, p.1 - 3
DOI: https://doi.org/10.3997/2214-4609.202536016

Abstract

Summary

Sub-Messinian imaging in offshore Egypt is particularly challenging due to the complexity of the Messinian evaporites and the limitations of narrow-azimuth towed-streamer (NAZ) data. To address these challenges, a velocity model building workflow driven by time-lag full-waveform inversion (TLFWI) was implemented. Studies prove that this workflow can effectively mitigate the limitations of NAZ data and improve the velocity model and the migrated subsalt image. Additionally, FWI Image reveals more continuous subsalt structures by better accommodating illumination variations caused mainly by the complex overburden.

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References

Ghose, S., Zhang, K., Szwarc, T., Lyons, R., Panizzardi, J., Fekkes, F., Baudo, S., Clemenzi, L., Liu, Y., Ladeb, N., Hu, L. and Mei, J. [2025] Improving Subsalt Pre-Messinian Imaging in Egypt’s Nile Delta, Offshore East Mediterranean, Using Time_Lag FWI. 86th EAGE Conference & Exhibition 2025, Extended Abstracts.
[Google Scholar]
Zhang, Z., Mei, J., Lin, F., Huang, R. and Wang, P. [2018] Correcting for salt misinterpretation with full-waveform inversion. 88th SEG Annual International Meeting, Extended Abstracts, 1143–1147.
[Google Scholar]
Zhang, Z., Wu, Z., Wei, Z., Mei, J., Huang, R. and Wang, P. [2020] FWI imaging: Full-wavefield imaging through full-waveform inversion: 90th SEG Annual International Meetings, Extended Abstracts, 656–660.
[Google Scholar]

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Reducing Sub-Messinian Uncertainty in Offshore Egypt Using Time-lag FWI with Narrow-azimuth Towed-streamer Data

Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202536016

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Reducing Sub-Messinian Uncertainty in Offshore Egypt Using Time-lag FWI with Narrow-azimuth Towed-streamer Data

Abstract

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