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.
在慢速地层中偶极横波测井不能很好地压制纵波，致使横波首波的检测存在一定的难度。
Since P-Wave can not be suppressed in dipole shear wave log in slow formation, there are some difficulties in picking the first S-Wave arrival.
在这种情况下会产生横波首波，因此可以使用基于单极子传感器的标准技术测量地层横波。
In such conditions a shear head wave is generated, so that standard techniques based on monopole transducers can be used to measure formation shear velocity.
分析了各种损伤度，损伤位置，损伤区域大小对波幅，首波延时时间等的影响。
The strong influence of the degree, location and length of damage on the amplitude and the delaying time of the first wave are analyzed.
分析了各种损伤度，损伤位置，损伤区域大小对波幅，首波延时时间等的影响。
The strong influence of the degree, location and length of damage on the amplitude and the delaying time of the first wave are analyzed.
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