Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Frequency-dependent Seismic Anisotropy of Porous Rocks with Penny-shaped Cracks

    19873_downloaded_stream_391.pdf (6.018Mb)
    Access Status
    Open access
    Authors
    Brown, Luke
    Gurevich, Boris
    Date
    2004
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Brown, Luke and Gurevich, Boris. 2004. Frequency-dependent Seismic Anisotropy of Porous Rocks with Penny-shaped Cracks. Exploration Geophysics. 35 (2): 111-115.
    Source Title
    Exploration Geophysics
    DOI
    10.1071/EG04111
    Faculty
    Department of Exploration Geophysics
    Division of Resources and Environment
    URI
    http://hdl.handle.net/20.500.11937/21409
    Collection
    • Curtin Research Publications
    Abstract

    Porous reservoirs with aligned fractures exhibit frequency-dependent seismic anisotropy because of wave-induced fluid flow between pores and fractures. To relate the elastic properties of porous rocks with aligned fractures at low frequency, we use the linear slip model of fractures and anisotropic Gassmann fluid substitution. We combine this low-frequency anisotropic Gassmann model with a dispersion relationship, based on a penny-shaped crack model of fractures, to account for frequency-dependent anisotropy. The combined model is validated using experimental measurements of angle-dependent wave velocities of synthetic porous sandstone with aligned disc-shaped cracks. For the low-frequency anisotropic Gassmann model, the agreement between the measured and predicted velocities is reasonably good for both S-wave velocities, but P-wave anisotropy is overestimated by approximately 25%. This quantitative difference can be explained by fluid diffusion effects occurring at the relatively high frequencies used in the experiment (100 kHz), which are not accounted for by the low-frequency assumption of anisotropic Gassmann theory. The predictions of the combined frequency-dependent model, which considers this effect, give very good agreement with measured velocities.

    Related items

    Showing items related by title, author, creator and subject.

    • Elastic wave attenuation, dispersion and anisotropy in fractured porous media
      Galvin, Robert (2007)
      Development of a hydrocarbon reservoir requires information about the type of fluid that saturates the pore space, and the permeability distribution that determines how the fluid can be extracted. The presence of fractures ...
    • Effects of fractures on seismic waves in poroelastic formations
      Brajanovski, Miroslav (2004)
      Naturally fractured reservoirs have attracted an increased interest of exploration and production geophysics in recent years. In many instances, natural fractures control the permeability of the reservoir, and hence the ...
    • Angular and Frequency-Dependent Wave Velocity and Attenuation in Fractured Porous Media
      Carcione, J.; Gurevich, Boris; Santos, J.; Picotti, S. (2013)
      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 ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.