P-SV转换波AVO加权叠加反演

AVO weighted stack inversion of P-SV converted wave.

本文从 P- SV转换波反射系数幂级数近似公式出发 ,给出了多个由不同参数组合表示的 P- SV转换波反射系数近似式 ,并探讨了利用这些近似式进行 AVO加权叠加参数反演的理论和方法。不同理论模型的加权叠加反演结果表明 ,在利用 P- SV转换波 AVO进行加权叠加反演时 ,直接反演纵横波速度、密度以及波阻抗信息具有较大的误差 ;若直接反演剪切模量Δμ/μ和Δ(μρ) / (μρ)型流体因子 ,则不仅具有很高的精度 ,而且反演结果稳定 ,适用于 P- SV转换波和多波 AVO参数反演。

Starting from the approximation of power series of P-SV converted wave reflection coefficient,the paper gave the approximations of P-SV converted wave reflection coefficient represented by multi-composition of different parameters and explored the theory and methods using these approximations for AVO weighted stack parameters inversion.The results of the weighted stack inversion in different theoretical models showed that the larger errors existed in directly inversive velocity,density and wave impedance of P-and S-wave when using P-SV converted wave AVO for weighted stack inversion;on the contrary,direct inversion of shear modulus Δμ/μ and fluid factorΔ(μρ)/(μρ) not only has high precision but also has stable inversive results,being adaptable to AVO parameters inversion of P-SV converted wave and multi-wave.