Séminaire ISTerre

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The specific case of fullwave inversion applied to well seismic data: an informative wavefield and an underdetermined problem. An OVSP case in North Sea and application on DAS data.

lundi 6 mai 2024 - 11h00

Christophe Barnes - Associate Professeur at Geosciences and Environment Department, GEC Laboratory
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Today, well seismic is largely underused in both industry and academia.The main application is the calibration of migrated images obtained from surface seismic data.Other applications exist, for instance to improve the AVO analysis (walkaway), to estimate the VTI anisotropy (walkaway), to estimate the HTI anisotropy (walkaround) or for seismic monitoring.However, the use of these data to finely image and characterize reservoirs remains poorly developed, essentially because the wavefield is complex as soon as we have offset (wavefield dominated by S-waves) and because we cannot rely on data redundancy. Furthermore, the methods used to process the data remain based on simplistic hypotheses (1D earth, separation of up/down going fields, deconvolution, etc).We will see that fullwave viscoelastic inversion can be a solution to better use this seismic data, extract more information from them and obtain reliable images in the vicinity of the well despite the underdetermination of the problem.To show this, we will rely on a case in the North Sea for an OVSP acquisition with geophones and on applications (especially CCS) using DAS type sensors.

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Equipe organisatrice : Ondes et structures

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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