Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1986-10-30
1988-10-25
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 39, G01V 128, G01V 122, G01S 902
Patent
active
047808560
ABSTRACT:
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.
REFERENCES:
patent: 3622970 (1971-11-01), Sayous et al.
patent: 4044356 (1977-08-01), Fournier
patent: 4168485 (1979-09-01), Payton et al.
patent: 4297700 (1981-10-01), Nord et al.
patent: 4606039 (1986-08-01), Nicolas
Cunningham, A. B.; "Some Alternate Vibrator Signals"; 11/1/78; Geophysics, vol. 44, #12, pp. 1901-1914; see pp. 1907-1913 in particular.
Institut Francais du Pe'trole
Moskowitz Nelson
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