Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media
Wave-induced fluid flow generates a dominant attenuation mechanism in porous media. It consists of energy loss due to P-wave conversion to Biot (diffusive) modes at mesoscopic-scale inhomogeneities. Fractured poroelastic media show significant attenuation and velocity dispersion due to this mechanis...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Birkhaeuser Science
2013
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/14132 |
| _version_ | 1848748539549581312 |
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| author | Carcione, J. Gurevich, Boris Santos, J. Picotti, S. |
| author_facet | Carcione, J. Gurevich, Boris Santos, J. Picotti, S. |
| author_sort | Carcione, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Wave-induced fluid flow generates a dominant attenuation mechanism in porous media. It consists of energy loss due to P-wave conversion to Biot (diffusive) modes at mesoscopic-scale inhomogeneities. Fractured poroelastic media show significant attenuation and velocity dispersion due to this mechanism. The theory has first been developed for the symmetry axis of the equivalent transversely isotropic (TI) medium corresponding to a poroelastic medium containing planar fractures. In this work, we consider the theory for all propagation angles by obtaining the five complex and frequency-dependent stiffnesses of the equivalent TI medium as a function of frequency. We assume that the flow direction is perpendicular to the layering plane and is independent of the loading direction. As a consequence, the behaviour of the medium can be described by a single relaxation function. We first consider the limiting case of an open (highly permeable) fracture of negligible thickness. We then compute the associated wave velocities and quality factors as a function of the propagation direction (phase and ray angles) and frequency. The location of the relaxation peak depends on the distance between fractures (the mesoscopic distance), viscosity, permeability and fractures compliances. The flow induced by wave propagation affects the quasi-shear (qS) wave with levels of attenuation similar to those of the quasi-compressional (qP) wave.On the other hand, a general fracture can be modeled as a sequence of poroelastic layers, where one of the layers is very thin. Modeling fractures of different thickness filled with CO2 embedded in a background medium saturated with a stiffer fluid also shows considerable attenuation and velocity dispersion. If the fracture and background frames are the same, the equivalent medium is isotropic, but strong wave anisotropy occurs in the case of a frameless and highly permeable fracture material, for instance a suspension of solid particles in the fluid. |
| first_indexed | 2025-11-14T07:06:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-14132 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:06:39Z |
| publishDate | 2013 |
| publisher | Birkhaeuser Science |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-141322019-02-19T05:34:54Z Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media Carcione, J. Gurevich, Boris Santos, J. Picotti, S. attenuation Fractures boundary conditions anisotropy Wave-induced fluid flow generates a dominant attenuation mechanism in porous media. It consists of energy loss due to P-wave conversion to Biot (diffusive) modes at mesoscopic-scale inhomogeneities. Fractured poroelastic media show significant attenuation and velocity dispersion due to this mechanism. The theory has first been developed for the symmetry axis of the equivalent transversely isotropic (TI) medium corresponding to a poroelastic medium containing planar fractures. In this work, we consider the theory for all propagation angles by obtaining the five complex and frequency-dependent stiffnesses of the equivalent TI medium as a function of frequency. We assume that the flow direction is perpendicular to the layering plane and is independent of the loading direction. As a consequence, the behaviour of the medium can be described by a single relaxation function. We first consider the limiting case of an open (highly permeable) fracture of negligible thickness. We then compute the associated wave velocities and quality factors as a function of the propagation direction (phase and ray angles) and frequency. The location of the relaxation peak depends on the distance between fractures (the mesoscopic distance), viscosity, permeability and fractures compliances. The flow induced by wave propagation affects the quasi-shear (qS) wave with levels of attenuation similar to those of the quasi-compressional (qP) wave.On the other hand, a general fracture can be modeled as a sequence of poroelastic layers, where one of the layers is very thin. Modeling fractures of different thickness filled with CO2 embedded in a background medium saturated with a stiffer fluid also shows considerable attenuation and velocity dispersion. If the fracture and background frames are the same, the equivalent medium is isotropic, but strong wave anisotropy occurs in the case of a frameless and highly permeable fracture material, for instance a suspension of solid particles in the fluid. 2013 Journal Article http://hdl.handle.net/20.500.11937/14132 10.1007/s00024-012-0636-8 Birkhaeuser Science fulltext |
| spellingShingle | attenuation Fractures boundary conditions anisotropy Carcione, J. Gurevich, Boris Santos, J. Picotti, S. Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title | Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title_full | Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title_fullStr | Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title_full_unstemmed | Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title_short | Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media |
| title_sort | angular and frequency-dependent wave velocity and attenuation in fractured porous media |
| topic | attenuation Fractures boundary conditions anisotropy |
| url | http://hdl.handle.net/20.500.11937/14132 |