Energy Dissipation of P- and S-Waves in Fluid-Saturated Rocks: An Overview Focusing on Hydraulically Connected Fractures  

作　　者：J.German Rubino Beatriz Quintal Tobias M.Muller Luis Guarracino Ralf Janicke Holger Steeb Klaus Holliger 

机构地区：[1]Applied and Environmental Geophysics Group, Institute of Earth Sciences, University of Lausanne [2]Energy Flagship, Commonwealth Scientific and Industrial Research Organization [3]CONICET, Facultad de Ciencias Astronomicasy Geofisicas, Universidad Nacional de La Plata [4]Institute of Mechanics, University of Bochum

出　　处：《Journal of Earth Science》2015年第6期785-790,共6页地球科学学刊（英文版）

基　　金：supported in part by grants from the Swiss National Science Foundation;the Agencia Nacional de Promocion Cientifica y Tecnologica (No. PICT 2010-2129), Argentina;the Fondation Herbette of the University of Lausanne

摘　　要：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.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.

分 类 号：P315.3[天文地球—地震学] O35[天文地球—固体地球物理学]