terms:check_shot_survey
A check shot survey determines formation seismic wave velocities over specified depth intervals. Travel times from a surface energy source to a downhole geophone located at different depths are measured. Distance between successive geophone locations, d. divided by the difference in travel time to the geophones at the successive locations, Δt, is the average formation velocity between the geophone locations; v = d/Δt
Source and receiver positions can be switched; i.e., small energy sources can be used in the borehole with a fixed geophone at the surface.
Interval velocities are needed for interpreting seismic reflection profiles.
terms/check_shot_survey.txt · Last modified: 2023/11/22 08:40 by 127.0.0.1