Brief description of the marine seismic prospection using a vibratory signal code and device for implementing it.

摘要

An offshore reflection seismic prospection method is provided including a vibratory signal coded in accordance with a pseudo-random code. Correlation of the signals received by the seismic sensors by means of the cycle of the coded signal transmitted allows seismic plots to be obtained similar to what a pulsed source would provide firing at time intervals equal to the duration of the cycle of the coded signal. Correlation with time shifted cycles reduces the distance between plots recorded on the same sensor. The transmissions coming from two or more vibrators, transmitting the same coded signal with shifted cycles, may be separated by correlation with one of the cycles used.