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多分量地震资料叠前深度偏移技术可以对地下复杂地质构造进行更准确的成像,精确成像的前提是获取准确的纵横波偏移速度。本文采用高斯束偏移方法对多波地震数据进行偏移速度分析,首先分别给出纵波和转换波共偏移距域高斯束叠前深度偏移方法原理,在此基础上抽取纵波和转换波偏移距域共成像点道集;然后根据共成像点道集拉平准则,分别对纵波和横波速度进行更新;当两种波成像深度不一致时,对纵波和转换波成像剖面进行深度匹配,完成高精度的纵横波偏移速度分析。模型数据和实际资料试算表明,该方法是一种有效的多波偏移速度分析方法。
The multi-component seismic data pre-stack depth migration technology can accurately map the complex underground geological structures. Accurate imaging is based on the premise of obtaining accurate S-wave migration velocity. In this paper, the Gaussian beam migration method is used to analyze the migration velocity of multi-wave seismic data. Firstly, the principle of prestack depth migration of Gaussian beam with common offset of longitudinal and converted waves is given respectively. On this basis, the longitudinal and converted waves are extracted Then, the longitudinal and shear wave velocities are updated respectively according to the leveling criterion of the common imaging point gathers. When the depths of the two wave images are not consistent, the depth profiles of the longitudinal and converted wave imaging sections are matched to complete High Speed Polarization and Skew Wave Velocity Analysis. The model data and experimental data show that this method is an effective multi-wave migration velocity analysis method.