Gun shot control unit for seismic exploration

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting

Patent

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Details

367144, 181107, 181110, 377 20, 377 30, G01V 138, G01V 108

Patent

active

045119996

ABSTRACT:
A gun shot control unit for a seismic exploration system compensates for the inherent delay between the shot command signal and the actual occurrence of the seismic pulse. A digital clock is synchronized with an external source. Timing pulses occurring at a time preceding the timing pulse upon which the occurrence of a seismic pulse is desired are produced by the clock. These timing pulses start a digital counter at a time preceding the desired time of occurrence of the seismic pulse. This counter is adjustable so that the delay which interposes between the timing and the actual occurrence of the seismic pulse can be minimized.

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Avedik et al, "Ocean Bottom Refraction Seismograph", 1978, Marine Geo. Resear., vol. 3, pp. 357-379.
Ibrahim et al, "A Comparison . . . Shelf Zone", 46th Annu. SEG Mtg., Texas, 10/10/76.

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