Quantitative comparison of simulations of seismic wave propagation in heterogeneous poro-elastic media involving fluid-solid interfaces and in equivalent visco-elastic solids

Détails

ID Serval
serval:BIB_800E971BC742
Type
Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
Collection
Publications
Institution
Titre
Quantitative comparison of simulations of seismic wave propagation in heterogeneous poro-elastic media involving fluid-solid interfaces and in equivalent visco-elastic solids
Titre de la conférence
SEG Technical Program Expanded Abstracts
Auteur(s)
Sidler R., Rubino J.G., Holliger K.
ISSN-L
1052-3812
Statut éditorial
Publié
Date de publication
2012
Pages
1-6
Langue
anglais
Notes
Sidler2012a
Résumé
There is increasing evidence to suggest that the presence of mesoscopic
heterogeneities constitutes the predominant attenuation mechanism
at seismic frequencies. As a consequence, centimeter-scale perturbations
of the subsurface physical properties should be taken into account
for seismic modeling whenever detailed and accurate responses of
the target structures are desired. This is, however, computationally
prohibitive since extremely small grid spacings would be necessary.
A convenient way to circumvent this problem is to use an upscaling
procedure to replace the heterogeneous porous media by equivalent
visco-elastic solids. In this work, we solve Biot's equations of
motion to perform numerical simulations of seismic wave propagation
through porous media containing mesoscopic heterogeneities. We then
use an upscaling procedure to replace the heterogeneous poro-elastic
regions by homogeneous equivalent visco-elastic solids and repeat
the simulations using visco-elastic equations of motion. We find
that, despite the equivalent attenuation behavior of the heterogeneous
poro-elastic medium and the equivalent visco-elastic solid, the seismograms
may differ due to diverging boundary conditions at fluid-solid interfaces,
where there exist additional options for the poro-elastic case. In
particular, we observe that the seismograms agree for closed-pore
boundary conditions, but differ significantly for open-pore boundary
conditions. This is an interesting result, which has potentially
important implications for wave-equation-based algorithms in exploration
geophysics involving fluid-solid interfaces, such as, for example,
wave field decomposition.
Mots-clé
attenuation, marine, porosity, reflection, sea floor
Création de la notice
25/11/2013 18:31
Dernière modification de la notice
20/08/2019 15:40
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