基于HTI介质理论的纵波速度分析方法

随着地震勘探精度的不断提高,仅考虑VTI介质各向异性速度分析方法已不能满足宽方位地震资料速度分析和动校正的需要.针对宽方位纵波资料方位各向异性特点,讨论了HTI介质各向异性速度分析方法.根据方位各向异性理论,得出了速度和裂缝方位满足的椭圆方程.采用最小二乘拟合方法,求出了椭圆方程的参数解.根据椭圆方程求出每个方位的速度...

P wave velocity analysis method based on the HTI media theory

With the continuous improvement of seismic exploration precision,the anisotropic velocity analysis method considering only VTI media is unable to meet the needs of the velocity analysis of the wide-azimuth seismic data and NMO processing.Using azimuthal anisotropy characteristics of the wide-azimuth P wave data,the velocity analysis method is discussed by HTI media theory.According to the anisotropic theory,the elliptic equation satisfied velocity and fracture azimuth is written out in this paper.The least-squares fitting method is used to solve the elliptic equation parameters.Every azimuth velocity calculated by the elliptic equation is used in NMO processing for the azimuth data.The azimuth velocity is used to process the corresponding azimuth data,which can moveout different azimuth data and make the events flatten.So,the seismic sections quality can be improved greatly after processing.The method is used in processing the wide-azimuth seismic data in HXC-GMZ area in the west of Sichuan successfully.