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Elastic Full-Waveform Inversion for Improved Salt Model Building in the Central North Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 83rd EAGE Annual Conference & Exhibition Workshop Programme, Jun 2022, Volume 2022, p.1 - 3
Abstract
Conventional acoustic full-waveform inversion (FWI) workflows exhibit limitations when the assumption of slowly varying elasticity is violated. Mode conversions between P- and S-waves occur at sharp interfaces and lead to differences in the wave-equation modelling. This indicates velocity model building should benefit from using the more accurate elastic FWI solution in areas of strong elasticity. We demonstrate this with results from a typical salt diapir in the Central North Sea, where the acoustic FWI result has already generated a good velocity model and subsequent image. Even with a basic assumption related to the P- and S-wave velocity (Vp/Vs) ratio, the elastic FWI result can further improve both the velocity model and resulting reverse time migration image, especially in areas of structural and velocity complexity that are associated with strong velocity contrasts.