Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1981-11-20
1984-03-13
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 21, 367 49, 181104, G01V 136, G01V 138
Patent
active
044371756
ABSTRACT:
A method of producing a seismic signal indicative of the substrata beneath a body of water comprising the steps of: supplying acoustic energy to the body of water; sensing at a predetermined depth the pressure wave reflected from the substrata beneath the body of water and the secondary pressure wave caused by a secondary reflection of the pressure wave from the air-water interface and generating a first signal indicative thereof; sensing at the predetermined depth the particle velocity of the water accompanying the pressure wave reflected from the substrata and the secondary pressure wave and generating a second signal indicative thereof; filtering the second signal such that portions of the second signal that have a frequency that is less than a first frequency are attenuated by the filtering to generate a third signal, the first frequency being less than a second frequency which is equal to the wave propagation velocity of the body of water divided by two times the predetermined depth; and combining the first and third signals to produce a signal indicative of the substrata beneath the body of water.
REFERENCES:
patent: 2740945 (1956-04-01), Hawes
patent: 3290645 (1966-12-01), Pavey, Jr. et al.
patent: 3299397 (1967-01-01), Paney et al.
patent: 3988620 (1976-10-01), McDavid
patent: 4134097 (1979-01-01), Cowles
patent: 4253164 (1981-02-01), Hall
patent: 4345473 (1982-08-01), Berni
Moskowitz Nelson
Shell Oil Company
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