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The evolution of tomography and FWI: an example of high resolution velocity estimation using refraction and reflection FWINormal access

Authors: I.F. Jones, J. Singh, P. Cox, M. Warner, C. Hawke, D. Harger and S. Greenwood
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: 10.3997/2214-4609.201801884
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 460.79Kb )
Price: € 20

The primary objective of this project was to improve the understanding of the internal structure of the Viscata and Fortuna reservoirs, and this objective was met via clearer internal imaging of these reservoir intervals and the overlying gas-charged sediments. The underlying geophysical challenge was the presence of extensive, but small-scale low-velocity gas pockets, which gave rise to significant and cumulative image distortion at target level. This distortion had not been resolved in a vintage 2013 broadband preSDM project, as the velocity model was not sufficiently well resolved. But in the initial commercial phase of this project, high-resolution non-parametric tomography using improved broadband deghosted data enabled us to achieve the stated objectives. The follow-on work, considered here, deals with the use of full waveform inversion, to see if we could further delineate small-scale velocity anomalies, associated with the highly compartmentalized reservoir units.

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