中文摘要：

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.

英文摘要：

The precision of Conversion point coordinate computation is affected directly by S-P velocity ratio,interface depth and angle,all of which are difficult to obtain in actual converted wave data processing.This paper systematically studies the influence of S-P velocity ratio error,interface depth error and interface angle on the conversion point coordinate computation by means of iterative method and ray tracing method.We find that：1）The influence of interface depth error on conversion point coordinate computation is less and the computation result of conversion point coordinate doesn＇t change with the interface depth increasing.2）The influence of S-P velocity ratio error on the conversion point coordinate computation is greater than that of interface depth and the error of conversion point coordinate increases with the S-P velocity ratio increasing.3）It will cause larger error to conversion point coordinate computation in the situation of dipping interface if using the method for horizontal interface.The larger the dipping angle is,the larger the computation error is.Whereas this influence decreases with the offset increasing.