Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1980-04-25
1981-11-24
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 12, 367106, 367130, G01V 136, G01V 138
Patent
active
043028241
ABSTRACT:
A seismic survey apparatus comprises circuit arrangements for providing a train of first signals each corresponding to a sound wave transmitted towards the sea bed, and circuit arrangements for providing associated trains of second signals each corresponding to sound waves reflected from the sea bed. Signal storage means are provided for storing the trains of associated second signals. A filter is provided for deriving from the first and associated second signals a control signal indicative of the apparent vertical movement of the surface of the sea bed due to wave motion or swell. The read out from the signal storage means is then controlled in accordance with the control signal to compensate for the apparent vertical movement of the sea bed due to wave motion or swell. Preferably the read out from the signal storage means is controlled by delaying or advancing the read out of the second signal in accordance with the control signal.
REFERENCES:
patent: 3351895 (1967-11-01), Cuff et al.
patent: 3546698 (1970-12-01), Kaltschmidt
patent: 4104608 (1978-08-01), Melling et al.
patent: 4210897 (1980-07-01), Hutching
patent: 4222266 (1980-09-01), Theodorelan
patent: 4223556 (1980-09-01), Hutchins
"Shallow Sub-Bottom Profiling For Offshore Operations", 3/76, p. 10, Research Disclosure, 14317, 367/19, #143.
Geoscience Canada, Hutchins, "A Deep Tow High Resolution Seismic System . . .", 5/76, pp. 95-100, vol. 3, #2.
"Hydrosande Deep Towed Seismic System", 1976, p. 4, Hurtec (70) Ltd. ad Brochure.
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