各向异性方位AVO反演是获取地下介质各向异性参数，指导页岩油气储层地震预测的重要手段，正交各向异性介质可有效描述含垂直裂缝页岩地层。针对正交各向异性参数方位AVO反演存在的参数过多、正演算子条件数过高、稳定性不足等问题，本项目拟以宽频宽方位叠前地震数据为基础，方位振幅差异AVO反演为手段，含一组垂直裂缝的水平层状介质正交各向异性参数稳定反演为目标,通过不同方位振幅做差运算，研究正交各向异性介质模型参数化、方位振幅差异AVO正演算子建立、垂向对称轴方位预测及基于逐级扰动的正交各向异性参数宽频宽方位振幅差异AVO反演方法，以便降低正演算子条件数，增强反演收敛性和稳定性，量化反演结果置信区间，并通过模型及实际资料处理分析方法的有效性及适用性。本项目旨在形成稳定的正交各向异性参数反演预测方法，提高地震各向异性在页岩油气高效开发中的预测精度。

Anisotropic azimuthal AVO inversion works as important tool in the estimation of anisotropic parameters of underground medium, which is helpful in forecasting the fracturing of shale oil/gas. Shale formation with vertical fractures is often described with orthotropic medium. To solve the instability problem in AVO inversion caused by more model parameters and higher condition number of forward solver for orthotropic medium, we carry on the study on the methods with broadband and wide azimuthal pre-stack seismic data to model parameterization, establish the azimuthal amplitude difference AVO forward solver of orthotropic medium, forceast the azimuth of vertical symmetry axis of the orthotropic medium and implement the cascade iterative broadband and wide azimuthal amplitude difference AVO inversion for the orthotropic parameters under Bayesian theory. Those methods are helpful to reduce the condition number of the farword solver, enhance the inversion stability and convergent speed and quantify the confidence intervals of the inversion results. Synthetic and field data examples are finally used to verify the feasibility and effectiveness of the proposed method. This project aims to develop a stable broadband and azimuthal AVO inversion method to estimate the orthotropic parameters and enhance the forecasting precision of seismic anisotropic theory in the high-efficient development of shale oil/gas.