非零偏移距VSP就是在距离井口有一定距离的位置放炮，在井内安置检波器接收地震波，属于二维观测。
The shot is located in some distance from well and the geophone is positioned inside the well to receive the seismic wave, the method is called VSP which belongs to 2d data acquisition.
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。
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.
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