Analysis of Wave Scattering from a Viscoelastic Layer with Complex Shape

Favretto-Cristini, Nathalie; Aizenberg, Arkady; Ursin, Bjørn; Cristini, Paul; Tantsereva, Anastasiya

doi:10.1142/s0218396x17500230

Cited by 6 publications

(4 citation statements)

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“…The transducer has a dominant frequency of 500 kHz and a broad-beam radiation pattern, as the width of the main lobe is 35° at -3 dB. This radiation pattern allows for a large area to be illuminated and therefore more 3D effects to be captured, e.g., interaction of waves with multiple topographic features and multiple wave scattering (Favretto-Cristini et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Comparisons of numerical and laboratory datasets showed that the DKIM could correctly reproduce the wavefield, except in the vicinity of secondary shadow boundaries created by the interaction of the edges of the topographic structures. As a follow up of the work of Tantsereva et al (2014), Favretto-Cristini et al (2017 quantitatively analyzed the effect of multiple scattering and surface curvature on the wavefield, in order to define the cases where these effects may be neglected in the numerical modeling without a significant loss of accuracy. These works clearly show the importance of laboratory datasets as part of the benchmarking options for numerical algorithms.…”

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How to adapt numerical simulation of wave propagation and ultrasonic laboratory experiments to be comparable — A case study for a complex topographic model

et al. 2018

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

How to adapt numerical simulation of wave propagation and ultrasonic laboratory experiments to be comparable — A case study for a complex topographic model

et al. 2018

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“…Comparisons of numerical and laboratory data sets have shown that the DKIM could correctly reproduce the wavefield, except in the vicinity of shadow zones created by the interaction on the edges of the topographic structures. More importantly, a quantitative analysis of the effect of multiple scattering and the surface curvature on the wavefield has been then performed to define the cases where these effects may be neglected in the numerical modeling, in order to decrease the computational cost while maintaining a high accuracy (Favretto-Cristini et al, 2017). These works clearly show the importance of laboratory experiments as part of the benchmarking options for numerical algorithms.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 us, through comparison between experimental data and the numerical simulation, to point out some necessary future improvements of the laboratory setup to increase the accuracy of the experimental data, and the limitations of the numerical implementation that must also be tackled. Due to this approach, a hierarchical list of points can be collected, to which particular attention should be paid to make laboratory experiments an efficient tool in seismic exploration. Finally, the quality of 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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“…However, the choice of the appropriate reflection/transmisison coefficients (planewave, spherical-wave, effective) is a trade-off between computational cost/speed and quality/accuracy. For instance, Favretto-Cristini et al (2017) have shown that, depending on the interface geometry (curvature, slope...), considering effective reflection coefficients may lead to large computational costs and is not mandatory to reach a largely acceptable accuracy of the results.…”

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Amplitude and phase changes for reflected and transmitted waves from a curved interface in anisotropic media

Ursin

Favretto-Cristini

Cristini

2020

Geophysical Journal International

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Summary It is well known that seismic data that have been recorded in complex geological environments must be compensated for geometrical spreading before AVO/AVA analysis, in order to avoid erroneous imaging interpretation. By investigating analytically both the effect of the geometrical spreading and the effect of the reflector curvature on amplitude and phase changes for reflected and transmitted waves between anisotropic media, using ray theory, we show that these data should be compensated for interface effects as well. In order to gain insight more specifically in the focusing effect of the interface, the special case of homogeneous isotropic media separated by a curved interface of syncline type is discussed and compared to the case of a plane interface. 3D numerical simulations of wave reflection from curved interfaces using a Spectral-Element Method validate our analytical derivations. In particular, numerical seismograms obtained at a vertical receiver array highlight that the effect of interface curvature on the reflected events is much more pronounced in a restricted area associated with the existence of caustics, which is consistent with our analytical predictions. Moreover, comparisons between the numerical and the analytical results confirm the fact that using plane-wave reflection coefficients without correction for the interface effect may lead to wrong interpretation of AVA/AVO analysis.

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Analysis of Wave Scattering from a Viscoelastic Layer with Complex Shape

Abstract: International audienc

Cited by 6 publications

References 9 publications

How to adapt numerical simulation of wave propagation and ultrasonic laboratory experiments to be comparable — A case study for a complex topographic model

How to adapt numerical simulation of wave propagation and ultrasonic laboratory experiments to be comparable — A case study for a complex topographic model

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

Amplitude and phase changes for reflected and transmitted waves from a curved interface in anisotropic media

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