Communications: electrical – Selective – Having electron beam device
Patent
1975-09-29
1977-07-19
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
235181, 340 155CC, 340 155DP, G01V 136
Patent
active
040371905
ABSTRACT:
A method of carrying out vibratory seismic operations with the object of minimizing correlation noise lobes, comprising, repeating a vibratory source a plurality of times each with a different sweep, having different terminal frequencies, correlating each received signal with its corresponding sweep, and stacking the resultant correlograms. The range in terminal frequencies for the plurality of sweeps should preferably be in the range of one octave or more. Another method of operation is to vary the time durations of the successive sweeps, preferably over a range of 2 to 1, and correlating the received signals and sweeps, and then stacking. In a third method of operation both the time durations and the terminal frequencies are varied. The successive repetitions of the source can be at the same source point and the results straight stacked, or they can be at different independent source points and the results CDP stacked.
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patent: 2981928 (1961-04-01), Crawford et al.
patent: 3417370 (1968-12-01), Brey
patent: 3571788 (1971-03-01), Backus et al.
patent: 3731268 (1973-05-01), Landrum, Jr.
patent: 3883725 (1975-05-01), Fort et al.
Birmiel Howard A.
Geophysical Systems Corporation
Silverman Daniel
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