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Solving Imaging Challenges In A Deep Water, Complex Ooze Regime - A Case Study From The Outer Vøring AreaNormal access

Authors: S. Naumann, Ø. Korsmo and G. Rønholt
Event name: First EAGE/PESGB Workshop on Velocities
Session: Reflection on FWI Applications
Publication date: 22 February 2018
DOI: 10.3997/2214-4609.201800017
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 830.77Kb )
Price: € 20

In this paper we present a case study from the outer Vøring area in the Norwegian Sea where we applied a Full Waveform Inversion (FWI) approach to build a high resolution velocity model. The water depth and the geological complexity in the study area required the use of both reflected and transmitted waves in the inversion process. The use of reflections in the inversion data window allows updating the velocity model beyond the penetration depth of diving waves. In this case study we performed FWI on a 5500km2 dual sensor streamer dataset and we were able to build a high resolution velocity model down to 4km depth. Furthermore we demonstrate improved imaging results by combining the derived velocity model with a detailed attenuation (Q) model in a Q-Kirchhoff pre-stack depth migration algorithm (Q-KPSDM).

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