Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1994-06-13
1995-04-25
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367190, 367 38, 367 40, 367 41, 181108, 181113, G01V 100
Patent
active
054105170
ABSTRACT:
A method for cascading or linking seismic vibrator sweeps to form a cascaded sweep sequence. According to the method, a first cascaded sweep sequence is generated containing N sweep segments linked end-to-end. The N sweep segments are substantially identical, except that the initial phase angle of each sweep segment within the sweep sequence is progressively rotated by a constant phase increment of about 360/N degrees. A second cascaded sweep sequence is generated consisting of (i) N consecutive sweep segments linked end-to-end which correspond to said first cascaded sweep sequence and (ii) an additional sweep segment linked to the N consecutive sweep segments which is positioned and phased so as to substantially suppress harmonic ghosts during correlation. One of these cascaded sweep sequences is used for the vibrator sweep sequence and the other is used for the correlation reference sequence. Any type of sweeps may be cascaded or linked according to the method, and any amount of padding (listen time) may be inserted between the individual sweep segments.
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Bell Keith A.
Eldred J. Woodrow
Exxon Production Research Company
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