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Mobile Shale Model Building And Update Using Multi-Disciplines And A Combination Of FWI And TomographyNormal access

Authors: S. Chen, J. Dai, L. Zhang, K. Glaccum, B.J. Koechner, S. Dasgupta and A. Klebleeva
Event name: First EAGE/PESGB Workshop on Velocities
Session: Reflection on FWI Applications
Publication date: 22 February 2018
DOI: 10.3997/2214-4609.201800018
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.91Mb )
Price: € 20

A large expanse of mobile shale of variable sizes exist throughout most of the Perdido Fold Belt, especially on the western side of this project’s survey. Due to the low shear (high ductility) of mobile shale, like mobile salt, they form a variety of intrusive and extrusive structures that disrupt the natural connectivity of the strata. Extremely low velocities and densities, compounded by strong absorption of seismic wave energy, make mobile shales a huge challenge for modern seismic imaging. To overcome this challenge, a model building workflow was devised including a procedure for mobile shale definition in addition to the conventional Deepwater supra-salt and subsalt depth imaging approach. Application of this new model building workflow on the Perdido Fold Belt survey demonstrated significant improvements in the final seismic image.

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