When the offset distance is smaller on the wellhead, the layer velocity obtained with straight line and the refraction line is matched with that of actual formation velocity.
当井口偏移距较小时，直线法和折线法求取的层速度和地层真速度吻合；
In a vertical seismic profile, offset is the horizontal distance between the source and the wellhead or the surface projection of the receiver in the case of a deviated well.
在垂直地震剖面中，偏移距是震源和井口之间的水平距离。在斜井的情况下，偏移距是震源和检波器在地表的投影之间的距离。
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