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High-Resolution Reflection FWINormal access

Authors: M. Warner, T. Nangoo, A. Umpleby, N. Shah and G. Yao
Event name: 80th EAGE Conference and Exhibition 2018
Session: FWI I - Dealing With Reflection
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800693
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 579.76Kb )
Price: € 20

We demonstrate reflection FWI on a less-than-ideal 3D narrow-azimuth towed-streamer dataset that contains little refracted energy and that is deficit in low frequencies. We begin from a very simple starting model built rapidly from stacking velocities. We fist use an FWI scheme that alternates between a migration-like and a tomography-like stage, showing that this can both recover the background velocity model and generate high vertical resolution. We follow this by using global inversion to build the long-wavelength anisotropy model. Finally, we use more-conventional reflection-based FWI to introduce the full range of wavelengths into the recovered velocity model, and show that this both migrates the reflection data and is structurally conformable with the reflections.

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