VTI介质中的弹性阻抗与参数提取

弹性阻抗是波阻抗的扩展,可以更好的反映储层和流体性质.常规弹性阻抗方程忽略了各向异性的影响,不能正确地描述各向异性介质中弹性阻抗的性质.本文基于Ruger给出的VTI介质反射系数近似公式,结合Connolly推导弹性阻抗的思想,推导出了一种VTI介质中的弹性阻抗方程.通过引入归一化常数,对方程进行了标准化,消除了方程量纲随角度变化而变化的不足.结合常规弹性阻抗反演的流程,得出了VTI介质中弹性阻抗反演的流程.最后,开展了从VTI介质弹性阻抗数据体中提取岩石物性参数的方法研究.数值测试表明,所讨论的参数提取方法具有一定的理论和应用价值.

Elastic impedance in vti media and parameter extraction

Elastic impedance is the extension of acoustic impedance, it can reflect reservoir and properties of fluid well. Ordinary elastic impedance equation ignores the effect of anisotropy, so it can not describe the character of elastic impedance in anisotropic media. We deduce a kind of elastic impedance equation for VTI media with the idea from elastic impedance obtained by Connolly, basing on the reflection coefficient formula given by Ruger. After that, in order to remove the dimensionality of equation as a function of angle, we normalize the new equation with constants. Then, we obtain the flow of elastic impedance inversion in VTI media according to that of traditional elastic inversion. At last, we do research on the method of extracting parameters from elastic impedance data in VTI media. The numerical test shows that the method for parameter extraction discussed has some theoretical and practical values.