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利用零偏VSP初至波在不同接收点频谱绝对值，展示了井所在地区地震波在地下的传播规律。根据各测点初至波频率、振幅的变化情况得出地层对地震波的吸收规律，并且利用初至波的分频曲线求得地层品质因数Q值。
The use of zero-offset VSP first-arrival wave at different receiving points of the absolute value of the spectrum, showing the wells where the seismic wave propagation in the ground. According to the change of initial frequency and amplitude of each measuring point, we can get the law of absorption of the seismic wave and obtain the Q factor of the formation quality by using the crossover curve of the first break.