首波（head wave）产生于当入射角等于临界角时，透射线将沿着分界面以第二介质的速度滑行，形成首波。
研究结果表明，该区不同界面的首波和反射波具有不同的特征。
The result shows that the head waves and reflected waves from different interfaces in this region possess different characteristics.
用全波列记录，不仅可以确定首波的慢度，也可以确定后续波的慢度。
With full-waveform recording, it is possible to determine the slowness not only of the first arrival but also of later arrivals.
结合首波到时和能量信息可以更好地评价小型模型井的不同胶结状态。
Combining information of the first wave arrivals and energy can evaluate the cement bond quality of modeling Wells.
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