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通常进行速度分析时仅设地层没有速度横向变化，但是实际情况并非如此。本文采用射线追踪方法计算了几种浅部地层速度横向变化模型的时距曲线。速度分析的结果表明，浅层速度横向变化会对深层的速度分析结果有不可忽视的影响，产生与横向均匀介质完全不同的现象。由此可见，在利用速度分析结果建立速度模型时，必须考虑这些效应。
The usual velocity analysis is based on the assumption that there is no horizontal velocity change in the formation, but this is not the case. In this paper, the ray tracing method is used to calculate the time-distance curve of several lateral velocity variations in shallow strata. The results of the velocity analysis show that the lateral velocity variation of the shallow layer can have a significant impact on the velocity analysis result in the deep layer, resulting in a totally different phenomenon from that of the horizontal homogeneous medium. It can be seen that these effects must be considered when establishing the velocity model using velocity analysis results.