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在多波地震资料处理中,转换波由于传播路径非对称,以及各向异性的影响,其时距方程需要多参数进行描述。参数增加,使得转换波资料的处理与分析变得更加复杂。本文给出了VTI介质中双参数转换波时距方程,参数为转换波叠加速度和纵波水平方向速度与转换波叠加速度平方比。该方程在保证精度的前提下减少了参数个数。模型数据和实际数据应用分析验证了方程的适用范围和双参数估算的精度。而且,该方程与层状各向同性介质下双参数方程形式相同。该方程简化了转换波处理及参数估算过程,可用于实际转换波资料处理与解释。同时,采用双参数扫描方法,从转换波数据中可直接求取高精度的和,并且速度比模型可用于纵波、转换波资料匹配。
In multi-wave seismic data processing, the time-dependent equation requires multiple parameters to describe the converted wave due to the asymmetric propagation path and the anisotropy. The increase of parameters makes the processing and analysis of converted wave data more complicated. In this paper, the two-parameter converted wave time-space equation in VTI media is given. The parameters are the converted wave superposition velocity, the horizontal direction velocity and the square of the converted wave superposition velocity. The equation reduces the number of parameters under the premise of ensuring accuracy. The application of model data and actual data verify the application of the equation and the accuracy of two-parameter estimation. Moreover, this equation has the same form as the two-parameter equation for the layered isotropic medium. The equation simplifies the conversion wave processing and parameter estimation process, which can be used for the actual conversion wave data processing and interpretation. At the same time, using the two-parameter scanning method, the high-precision summation can be obtained directly from the converted wave data, and the velocity ratio model can be used to match the longitudinal wave and converted wave data.