An analytical relationship between scattering attenuation and porosity in oceanic crust
An analytical relationship between scattering attenuation and porosity in oceanic crust
复制标题
洋壳中散射衰减与孔隙度的解析关系
DOI：
10.1029/2001gl013111
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发表时间：
2001
影响因子：
5.2
通讯作者：
D. Goldberg
中科院分区：
文献类型：
--
作者：
Y. F. Sun;D. Goldberg
基于多次后向散射模型，从理论上推导了散射衰减与孔隙度之间的关系。引入了两个参数，非均质性参数γ和地层参数β0来描述这种关系：其中ϕ是孔隙度，Qs0是ϕ=0时的实测值。地层参数β0描述了岩石和孔隙流体性质以及裂缝等微观尺度的地层性质。非均质性参数γ表示局部/区域尺度的非均质性对散射衰减的影响，例如层和裂缝。这两个参数的相对重要性取决于传播波长。这种分析形式与先前报道的洋壳实验结果相吻合。数值分析表明，局地/区域尺度的非均质性γ比微尺度特性β0对洋壳在地震和声波波段的散射衰减起着更重要的作用。
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: , 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.