A comparison of seismic attenuation models for unconsolidated surficial sediments: Evidence from multi-frequency sonic logs

Détails

ID Serval
serval:BIB_E2E301F1D804
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
A comparison of seismic attenuation models for unconsolidated surficial sediments: Evidence from multi-frequency sonic logs
Titre de la conférence
5th Biot Conference on Poromechanics, Vienna, Austria
Auteur⸱e⸱s
Milani M., Rubino G., Baron L., Sidler R., Holliger K..
Statut éditorial
Publié
Date de publication
2013
Langue
anglais
Notes
Milani2013
Résumé
In this work, we have used numerical oscillatory compressibility simulations
based on the quasi-static poroelastic equations to study the role
played by fracture connectivity on the characteristics of seismic
attenuation due to wave-induced fluid flow (WIFF). We verified that,
in absence of fracture connectivity, mesoscale fractures oriented
perpendicularly to the direction of seismic wave propagation generate
important levels of attenuation, which are produced by WIFF between
fractures and the embedding porous matrix. In addition, as soon as
they are intersected by other fractures, the seismic signatures change
rather dramatically. In particular, a decrease in the attenuation
peak related to the unconnected scenario together with the appearance
of an additional attenuation peak can be observed. The spatial distributions
of the local energy dissipation allowed us to confirm that the additional
manifestation of WIFF arising in presence of fracture connectivity
is produced by fluid flow within fractures. We also corroborated
that in presence of connectivity seismic attenuation is sensitive
to key hydraulic parameters, namely permeabilities, lengths, aperture
and intersection angle of the fractures, as well as to the connectivity
degree of the fracture network. Correspondingly, a better understanding
of this topic may allow to extract these key properties from seismic
data.
Création de la notice
25/11/2013 18:41
Dernière modification de la notice
21/08/2019 5:14
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