On the parameterization of seismic anisotropy in elastic waveform inversion - The HTI case

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F17%3A00488259" target="_blank" >RIV/67985530:_____/17:00488259 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.3997/2214-4609.201701227" target="_blank" >http://dx.doi.org/10.3997/2214-4609.201701227</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3997/2214-4609.201701227" target="_blank" >10.3997/2214-4609.201701227</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the parameterization of seismic anisotropy in elastic waveform inversion - The HTI case

Popis výsledku v původním jazyce

The full waveform inversion (FWI) problem can generally be reduced to a sequence of linear inversenproblems by using local optimization methods (Lee et al., 2010) or direct iterative inversion methodsn(Jakobsen and Ursin, 2015). However, each linearized inversion step is generally ill-posed, in the sensenthat some kind of regularization is generally required to find a stable and unique solution in the presence of model errors and noise. FWI in acoustic and elastic (isotropic or anisotropic) media share many common challenges, but the computational cost will obviously be larger in the anisotropic case than in the acoustic case. Also, there are often significant problems with cross-talk between the multiple model parameters that one needs to reconstruct in the anisotropic case (Lee et al., 2010). The problem with cross-talk can be potentially reduced by a reparameterization of the forward model (Lee et al., 2010 and Kamath and Tsvankin, 2015) by, for example, use of a more appropriate anisotropy parameterization. In this study, we have compared parameterization by elastic stiffness tensor in the Voigt notation and weak-anisotropy (WA) parameters in transversely isotropic media with a horizontal symmetry axis (HTI media). We used the Gassmann-consistent effective medium theory of fractured porous media introduced by Jakobsen and Pilskog (2016) to generate realistic stiffness and WA parameters models. We then performed a series of numerical inversion experiments, based on the ray-Born approximation, to investigate how accurately one can potentially recover the unknown model parameters using the two different parameterizations.

Název v anglickém jazyce

On the parameterization of seismic anisotropy in elastic waveform inversion - The HTI case

Popis výsledku anglicky

The full waveform inversion (FWI) problem can generally be reduced to a sequence of linear inversenproblems by using local optimization methods (Lee et al., 2010) or direct iterative inversion methodsn(Jakobsen and Ursin, 2015). However, each linearized inversion step is generally ill-posed, in the sensenthat some kind of regularization is generally required to find a stable and unique solution in the presence of model errors and noise. FWI in acoustic and elastic (isotropic or anisotropic) media share many common challenges, but the computational cost will obviously be larger in the anisotropic case than in the acoustic case. Also, there are often significant problems with cross-talk between the multiple model parameters that one needs to reconstruct in the anisotropic case (Lee et al., 2010). The problem with cross-talk can be potentially reduced by a reparameterization of the forward model (Lee et al., 2010 and Kamath and Tsvankin, 2015) by, for example, use of a more appropriate anisotropy parameterization. In this study, we have compared parameterization by elastic stiffness tensor in the Voigt notation and weak-anisotropy (WA) parameters in transversely isotropic media with a horizontal symmetry axis (HTI media). We used the Gassmann-consistent effective medium theory of fractured porous media introduced by Jakobsen and Pilskog (2016) to generate realistic stiffness and WA parameters models. We then performed a series of numerical inversion experiments, based on the ray-Born approximation, to investigate how accurately one can potentially recover the unknown model parameters using the two different parameterizations.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/GA16-05237S" target="_blank" >GA16-05237S: Seismické vlny v nehomogenních slabě anizotropních prostředích</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Energy, technology, sustainability - time to open a new chapter. 79th EAGE Conference and Exhibition 2017

ISBN

978-1-5108-4353-0

ISSN

—

e-ISSN

—

Počet stran výsledku

4

Strana od-do

—

Název nakladatele

Curran Associates

Místo vydání

Red Hook

Místo konání akce

Paris

Datum konání akce

12. 6. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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