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转换点坐标的计算精度直接受到横纵波速度比、界面深度和角度的影响,但在实际的转换波资料处理中,很难得到横纵波速度比、界面深度和角度的准确值.本文采用迭代法和射线追踪法,系统的分析横纵波速度比和界面深度误差以及界面的倾斜角度对转换点坐标计算的影响,通过计算表明:1)界面深度误差对转换点坐标的计算影响较小,转换点坐标的误差不随界面深度的增加而增大;2)横纵波速度比对转换点坐标计算的影响要比界面深度的影响大,且转换点坐标的误差随横纵波速度比的增大而增大;3)采用水平界面的方法来计算倾斜界面的转换点坐标,会造成较大的误差,界面的倾斜角度越大,转换点坐标的误差也越大,随着炮检距的增大,倾斜角度对转换点坐标的影响逐渐减小.
The calculation precision of the coordinates of the transition point is directly affected by the lateral-to-longitudinal-wave velocity ratio, the interface depth and the angle, but it is difficult to obtain the accurate values of the transverse-longitudinal-wave velocity ratio, the interface depth and the angle in the actual converted wave data processing.In this paper, And ray tracing method to systematically analyze the influence of the velocity ratio of cross-wave and compressional wave, interface depth error and the interface tilt angle on the coordinate transformation of the transition point. The calculation results show that: 1) The influence of the interface depth error on the calculation of transition point coordinate is small, The error of coordinate does not increase with the increase of interface depth; 2) The influence of transverse and longitudinal wave velocity ratio on the coordinate calculation of transition point is greater than that of interface depth, and the error of coordinate of transition point increases with the increase of transverse and longitudinal wave velocity ratio ; 3) The horizontal interface method to calculate the coordinates of the transition point of the inclined interface, will cause greater error, the larger the interface tilt angle, the greater the error of the conversion point coordinates, with the offset increases, the tilt The influence of the angle on the coordinates of the transition point decreases gradually.