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Penetrating Below the Diving Waves with RWI, AWI, and FWI: a NWS Australia Case StudyNormal access

Authors: H.A. Debens, T. Nangoo, F. Mancini, N. Shah, M. Warner, A. Umpleby and M. Aitchison
Event name: 81st EAGE Conference and Exhibition 2019
Session: Poster: FWI Case Studies A
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201900996
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.22Mb )
Price: € 20

Summary:
FWI has become a standard in velocity model building, however standalone FWI has not. To address this, FWI is brought into the model building sequence earlier by alternating RWI and AWI to recover the long-wavelength acoustic velocity model that is usually built by ray-based tomography. The corresponding long-wavelength anisotropy model is extracted using semi-global FWI. Least-squares FWI then has an adequate starting point to commence introducing the full range of length scales into the final model. The outcome is a high-resolution velocity model bypassing tomography, which penetrates over a kilometre deeper than the turning point of the deepest diving waves.


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