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Shaping the velocity model beyond the diving wave penetrationNormal access

Authors: D. Vigh, K. Jiao, D. Sun and X. Cheng
Event name: 80th EAGE Conference & Exhibition 2018 Workshop Programme
Session: WS01: Seismic Imaging with Ray and Waves - Where do we stand? Part I: Velocity Estimation
Publication date: 10 June 2018
DOI: 10.3997/2214-4609.201801880
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 592.95Kb )
Price: € 20

 Full-waveform inversion (FWI) usually utilizes diving and refracted waves to update the low-wavenumber/background components of the model; however, the update is often depth limited due to the limited offset range acquired. To extend conventional FWI beyond the limits of the transmitted energy, we must use reflection data. There are several ways of using the reflections to update the background model. Field data examples demonstrate that, even in a complex subsalt Gulf of Mexico setting, the background velocity model can be updated from shallow to deep water using conventional FWI followed by reflection-based FWI. 

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