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发明授权
CN108828660B 一种裂缝介质PP波与分裂PS波AVO联合反演方法 有权

一种裂缝介质PP波与分裂PS波AVO联合反演方法
摘要：
本发明公开了一种裂缝介质PP波与分裂PS波AVO联合反演方法，叠前AVA角道集进行了时间压缩匹配，再基于Rüger关于HTI介质的反射系数近似公式，运用高斯牛顿迭代算法，进行PP波、PS1波和PS2波联合反演，从而得到裂缝介质的各向异性参数和弹性参数结果，适用于裂缝HTI介质和各向同性介质，这是由于反射系数近似公式中，当各向异性参数为0，即为各向同性介质，即使初始模型为线性的，本发明的反演方法也能够得到很好的效果。HTI介质的多波AVO反演方法能够为裂缝介质地层提供岩性和流体和裂缝密度等有效信息。
摘要（英）：

The invention discloses a fracture medium PP wave and split PS wave AVO joint inversion method. The method comprises subjecting a pre-stack AVA angle gather to time compression matching, and subjecting a PP wave, a PS1 wave and a PS2 wave to joint inversion by using a Gauss-Newton iterative algorithm based on a Ruger reflection coefficient approximate formula about an HTI medium so as to obtain the anisotropic parameter and the elastic parameter result of the fracture medium. The method is suitable for the fracture HTI medium and the isotropic medium. In the reflection coefficient approximateformula, when the anisotropic parameter is 0, namely an isotropic medium, the inversion method of the present invention can obtain a good effect even if an initial model is linear. The multi-wave AVOinversion method of the HTI medium can provide effective information such as lithologic and fluid and fracture density for a fracture medium stratum.

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