In surface seismic acquisition, the horizontal distance from source to receiver. 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. Offset between seismic source and receiver creates a delay, or moveout, in the arrival time of a reflection that can be corrected before stacking and can be used to determine velocity.

Related Terms:

lithostratigraphic inversion
zero-offset data