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Energy dissipation of seismic P- and S-waves in fluid-saturated rocks: An overview focusing on hydraulically connected fractures

J. German Rubino ; Beatriz Quintal ; Klaus Holliger ; Tobias M. Müller ; Luis Guarracino ; Ralf Jänicke (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Holger Steeb
Journal of Earth Science (1674-487X). Vol. 26 (2015), p. 785-790.
[Artikel, refereegranskad vetenskaplig]

An important characteristic of fractured rocks is their high seismic attenuation, which so far has been mainly attributed to wave-induced fluid flow (WIFF) between the fractures and the embedding matrix. The influence of fracture connectivity on seismic attenuation has, however, recently, only been investigated. Numerical compressibility and shear tests based on Biot’s quasi-static poro-elastic equations illustrate that an important manifestation of WIFF arises in the presence of fracture connectivity. The corresponding energy loss, which can be significant for both P- and S-waves, is mainly due to fluid flow within the connected fractures and is sensitive to the permeabilities as well as the lengths and intersection angles of the fractures. Correspondingly, this phenomenon contains valuable information on the governing hydraulic properties of fractured rocks and hence should be accounted for whenever realistic seismic models of such media are needed.

Nyckelord: fractured rocks, seismic attenuation, WIFF, fracture connectivity, embedding matrix, Biot’s theory



Denna post skapades 2017-11-23.
CPL Pubid: 253347

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)

Ämnesområden

Samhällsbyggnadsteknik
Fastkroppsmekanik

Chalmers infrastruktur