Refraction Full-waveform Inversion in a Shallow Water Environment

Zou, Zhiyu; Ramos-Martinez, J.; Kelly, Steven; Rønholt, G.; Langlo, Lars Tore; Mavilio, A.V.; Chemingui, Nizar; Lie, J.E.

doi:10.3997/2214-4609.20141415

Cited by 6 publications

(2 citation statements)

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“…This not only improved the shallow imaging but also resolved depth ambiguities and mis-ties at reservoir level. A similar case using data from a dual-sensor towed-streamer acquisition was presented by Zou et al (2014) in which the authors show that modern streamer data contains refractions that produce good FWI velocity updates to a depth of about one-fourth of the streamer length. In these scenarios, FWI relied mainly on recorded diving waves to resolve small-scale geologic features up to the deepest turning point.…”

Section: Limitations To Current Implementations: Shallow Water Reflementioning

confidence: 80%

FWI for model updates in large-contrast media

et al. 2017

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We describe a new solution for recovering the long-wavelength features of a velocity model in gradient-based full-waveform inversion (FWI). The method uses reflected and transmitted wave modes to recover high-resolution velocity models. The new FWI gradient enables reliable velocity updates deeper than the maximum penetration depth of diving waves and reduces the FWI dependency on recording ultralong offsets. We also discuss a new FWI regularization scheme that overcomes the limitations of the inversion in the presence of high-contrast geobodies and cycle skipping. The solution utilizes a priori information about the earth model in the regularization as an extra term in the objective function. The implementation makes use of the split Bregman method, making it efficient and accurate. Results from applying the new FWI gradient to field data show that we can combine both transmitted and reflected energy in a global FWI scheme to obtain high-resolution velocity models without imprint of the reflectivity on the velocity updates. We illustrate the new regularization method's potential on the BP 2004 velocity benchmark model where our regularized FWI solution is capable of using a simple starting velocity model to deliver a high-quality reconstruction of salt bodies.

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Section: Limitations To Current Implementations: Shallow Water Reflementioning

confidence: 80%

FWI for model updates in large-contrast media

et al. 2017

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“…Full waveform inversion (FWI) is the tool of choice for building high-resolution velocity models in shallow water settings (e.g. Sirgue et al, 2009;Zou et al, 2014). In this scenario, recorded refractions and diving waves allow FWI to resolve small-scale geologic features up to the deepest turning point.…”

Section: Introductionmentioning

confidence: 99%

A Robust Gradient for Long Wavelength FWI Updates

Ramos-Martinez¹,

Crawley²,

Zou³

et al. 2016

78th EAGE Conference and Exhibition 2016

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We introduce a robust method to produce long wavelength updates in gradient-based Full Waveform Inversion (FWI). The solution introduces dynamic weights in the velocity sensitivity kernel derived from impedance and velocity parameterization of the classical objective function. The new kernel implementation effectively eliminates the migration isochrones produced by the specular reflections, enhances the low wavenumber components in the gradient in heterogeneous media, and is able to deliver velocity updates beyond the penetration depth of diving waves. We use synthetic examples to illustrate how this dynamic weighted FWI gradient successfully recovers the velocity from pre-critical reflections. We also show with dual-sensor streamer data from deep-water Gulf of Mexico how the dynamic weighted FWI gradient can combine both transmitted and reflected energy in a global FWI scheme.

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2020

Survey Design and Seismic Acquisition for Land, Marine, and in-Between in Light of New Technology and Techniques

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Refraction Full-waveform Inversion in a Shallow Water Environment

Cited by 6 publications

References 0 publications

FWI for model updates in large-contrast media

FWI for model updates in large-contrast media

A Robust Gradient for Long Wavelength FWI Updates

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