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Modelling Geological Layers Into New Velocity Models For Seismic Migration Process - A Brazilian Pre-Salt CaseNormal access

Authors: J.S. Fonseca, L. Teixeira, A. Maul, P. Barros, F. Borges, J. Boechat and M. González
Event name: First EAGE/PESGB Workshop on Velocities
Session: Regional Velocity Model Update
Publication date: 22 February 2018
DOI: 10.3997/2214-4609.201800010
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.97Mb )
Price: € 20

This paper presents a methodology to build velocity models that reflect geological features identified in previous migrated seismic, particularly within the Brazilian Santos Basin evaporitic salts section. To characterize a geological layer we propose the use of model-based acoustic inversion that contains the geological knowledge from wells and interpretations together with petrophysical correlations. As an outcome, a new migration process was performed coupling this modelled layer into previous tomographic velocities. The results are shown in gathers and stacked migrated sections with improvements in the flattening and the focusing of reflectors. We also defend that this method can be extended to other geological sections, and furthermore, this constructed velocity model could be a good input to FWI acoustic process.

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