Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1979-10-09
1981-10-13
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 23, 367 49, 367189, 364421, G01V 1143
Patent
active
042952131
ABSTRACT:
This invention provides for transmission of composite swept sine wave seismic signals wherein auto-correlation side lobes of such signals are reduced. The frequency spectrum of a desired swept sine wave seismic signal is divided into a number of consecutive segments, and the segments are arranged to form a sequence of segments by the order of frequency content. Component swept sine wave seismic signals each covering a segment in the sequence are generated simultaneously from the same location to produce the desired seismic signal. The component swept sine wave seismic signals are generated in a manner so that they alternate as upsweeps and downsweeps for consecutive segments in the sequence of segments. The seismic signal comprising the sum of the component swept sine wave seismic signals will have an auto-correlation function with reduced side lobes. Alternatively, the component swept sine wave seismic signals may be generated successively from the same location in a manner so that they alternate as upsweeps and downsweeps for consecutive segments in the sequence of segments. The reflections are successively recorded and stacked prior to correlation with the sum of the component swept sine wave seismic signals. Used in this manner, the sum of the component swept sine wave seismic signals will also have an auto-correlation function with reduced side lobes.
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Handly, "Vibralakator", 6/78, pp. 1-68, M.S. Thesis, Colorado School of Mines, T-2082.
Werner et al., "Cambisweep-A Contribution to Sweep Techniques," 3/79, pp. 78-105, Geophys. Prosp., vol. 27.
Bernhardt et al., "Encoding . . . Vibroseis System", 3/1978, pp. 184-193, Geophysical Prospecting, vol. 26, #1.
Cunningham, "Some Alternate Vibrator Signals", 11/1/78, pp. 1901-1914, Geophysics, vol. 44, #2, 48th SEG Meeting.
Exxon Production Research Company
Hsue James S.
Moskowitz Nelson
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