An analytical relationship between scattering attenuation and porosity in oceanic crust

Details An analytical relationship between scattering attenuation and porosity in oceanic crust An analytical relationship between scattering attenuation and porosity in oceanic crust

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3393s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 17, p. 3393-3396

Computer Science

Numerical Analysis

Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: Wave Attenuation, Seismology, Seismology: Theory And Modeling

Scientific paper

We present a theoretical derivation of the relationship between scattering attenuation and porosity based on a multiple back-scattering model. Two parameters, a heterogeneity parameter γ and a formation parameter β0, are introduced to characterize this relationship: Qs-1=Qs0-1(1+β0ϕ)2eγϕ, where ϕ is porosity, Qs0 is a measured value at ϕ=0. The formation parameter β0 describes the micro-scale formation properties such as rock and pore fluid properties and cracks. The heterogeneity parameter γ represents the effects of local/regional-scale heterogeneities on scattering attenuation, such as layers and fractures. The relative importance of these two parameters depends on the propagating wavelength. This analytical form fits empirical results in oceanic crust that have been previously reported. Numerical analysis shows that the local/regional-scale heterogeneity, γ, plays a more dominant role than the microscale properties, β0, on scattering attenuation at seismic and sonic wavelengths in the oceanic crust.

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