| 摘要 |
<p>A system for conducting a geophysical survey in a wellbore, comprises a battery-powered, self-contained, borehole seismic receiver 2, which internally digitizes and records an electrical signal generated by a transducer in the receiver, and a surface control unit 14 which records the acoustic signature of a seismic energy source 16, controls the firing of the seismic source 16, and correlates the recording in the receiver 2 with the recording of the acoustic signature of the source to determine the travel time of the seismic energy through the earth. <IMAGE></p> |
