P-wave signatures and notation for transversely isotropic media: An overview
P-wave signatures and notation for transversely isotropic media: An overview
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DOI：
10.1190/1.1443974
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发表时间：
1996-04
期刊：
影响因子：
3.3
通讯作者：
I. Tsvankin
中科院分区：
文献类型：
--
作者：
I. Tsvankin
各向异性介质中地震反演和处理的进展取决于我们将不同的地震特征与各向异性参数联系起来的能力。虽然传统的符号（刚度系数）是适合于正演模拟，它是不方便的发展分析洞察力的各向异性对波传播的影响。在这里，根据Thomsen符号给出了具有任意各向异性强度的横向各向同性（TI）介质中P波特征的一致描述。横向各向同性对P波传播的影响实际上与垂直S波速度VS 0无关，即使在速度变化很大的模型中也是如此。因此，横向各向同性对P波运动学和动力学特征的贡献仅由两个各向异性参数e和δ控制，其中垂直速度VP 0是均匀模型中的标度系数。反射波时差和振幅的畸变不一定是相关的。
Progress in seismic inversion and processing in anisotropic media depends on our ability to relate different seismic signatures to the anisotropic parameters. While the conventional notation (stiffness coefficients) is suitable for forward modeling, it is inconvenient in developing analytic insight into the influence of anisotropy on wave propagation. Here, a consistent description of P‐wave signatures in transversely isotropic (TI) media with arbitrary strength of the anisotropy is given in terms of Thomsen notation. The influence of transverse isotropy on P‐wave propagation is shown to be practically independent of the vertical S‐wave velocity VS0, even in models with strong velocity variations. Therefore, the contribution of transverse isotropy to P‐wave kinematic and dynamic signatures is controlled by just two anisotropic parameters, e and δ, with the vertical velocity VP0 being a scaling coefficient in homogeneous models. The distortions of reflection moveouts and amplitudes are not necessarily corr...