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Article Dans Une Revue Geophysics Année : 2020

Seismic surveying and imaging at the laboratory scale: A framework to cross-validate experiments and simulations for a salt-body environment

Résumé

Laboratory experiments have been recently reintroduced into the ideas-to-applications pipeline for geophysical applications. Benefiting from recent technological advances, we believe that in the coming years, laboratory experiments can play a major role in supporting field experiments and numerical modeling, to explore some of the current challenges of seismic imaging in terms of, for instance, acquisition design or benchmarking of new imaging techniques at a low cost and in an agile way. But having confidence in the quality and accuracy of the experimental data obtained in a complex configuration which mimics at a reduced scale a real geologic environment, is an essential prerequisite. This requires a robust framework regardless of the configuration studied. Our goal is to provide a global overview of this framework in the context of offshore seismics. To illustrate it, a reduced-scale model is used to represent a 3D complex-shaped salt body buried in sedimentary layers with curved surfaces. Zero-offset and offset reflection data are collected in a water tank, using a conventional pulse-echo technique. Then a cross-validation approach is applied, which allows through the comparison between the experimental data and the numerical simulation, to point out both some necessary future improvements of the laboratory setup to increase the accuracy of the experimental data, and the limitations of the numerical implementation which must also be tackled. Due to this approach, a hierarchical list of points can be collected, to which particular attention should be paid in order to make laboratory experiments an efficient tool in seismic exploration. Finally, the quality of both the complex reduced-scale model and the global framework is successfully validated by applying reverse-time migration to the laboratory data.
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Dates et versions

hal-03023394 , version 1 (25-11-2020)

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Bence Solymosi, Nathalie Favretto-Cristini, Vadim Monteiller, Paul Cristini, Bjørn Ursin, et al.. Seismic surveying and imaging at the laboratory scale: A framework to cross-validate experiments and simulations for a salt-body environment. Geophysics, 2020, 85 (3), pp.T123-T139. ⟨10.1190/geo2019-0313.1⟩. ⟨hal-03023394⟩
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