纵波-横波首波的间隔 S-P interval
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.
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