Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1989-01-30
1990-04-17
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 23, 367138, 367905, G01V 138
Patent
active
049186680
ABSTRACT:
A method of reducing horizontally propagating pressure waves in marine seismic exploration improves the signal-to-noise ratio at associated receivers and reduces interference at unassociated receivers. Marine vibrators are arranged into an array with a given separation between each vibrator, so that horizontally propagating pressure waves from the vibrators which generally traverse the array are out-of-phase at most frequencies of vibration. The amplitude output from each vibrator varies with the output frequency of each vibrator to maximize the cancellation of out-of-phase pressure waves along the array. A receiver, which usually includes a plurality of hydrophones disposed in a streamer, is spaced from the marine vibrators at a distance sufficient to establish the receiver as being in the far-field. The output of each of the marine vibrators is locked in phase and frequency with a known pilot signal so that downwardly propagating pressure waves are substantially unaffected. The overall effect is a narrowing of the radiation pattern of the pressure waves. The resulting radiation pattern effectively directs pressure waves downwardly toward an underwater land formation, and reduces horizontally propagating pressure waves which normally result in interference with marine seismic receivers.
REFERENCES:
patent: 4132974 (1979-01-01), Mollere
patent: 4163206 (1979-07-01), Hall, Jr.
patent: 4345473 (1982-08-01), Berni
patent: 4476553 (1984-10-01), Ziolkowski et al.
patent: 4483411 (1984-11-01), Mifsud
patent: 4486865 (1984-12-01), Ruehle
patent: 4616352 (1986-10-01), Sallas et al.
patent: 4618949 (1986-10-01), Lister
patent: 4705137 (1987-11-01), Fair
patent: 4709356 (1987-11-01), Ayers
patent: 4721180 (1988-01-01), Haughland et al.
patent: 4723231 (1988-02-01), Sallas
patent: 4727956 (1988-03-01), Huizer
patent: 4730692 (1988-03-01), Fair et al.
patent: 4739858 (1988-04-01), Dragoset, Jr.
patent: 4752916 (1988-06-01), Loewenthal
patent: 4780860 (1988-10-01), Sasakura et al.
Sallas, J. J., "Source-Tunable Array for Ground-Roll Reduction", presented at the 57th Annual Meeting of the SEG, Oct. 11-15, 1987.
Arnold Steven P.
Eldred Woodrow J.
Halliburton Geophysical Services Inc.
Jordan Charles T.
Weaver Thomas R.
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