Seismic data acquisition technique having superposed signals

Details Seismic data acquisition technique having superposed signals Seismic data acquisition technique having superposed signals

1987-06-23

1989-04-18

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 23, 364421, G01V 1143

Patent

active

048233269

ABSTRACT:
Vibrator seismic sources are operated concurrently to reduce the time required for acquiring the data for a seismic survey. Separate seismic records are produced for each of the concurrently operated vibrator seismic sources. Frequency sweeping pilot signals are generated for each of the separate vibrator seismic sources concurrently in a sequence of at least four sweeps. The pilot signals for each vibrator source have a plurality of separate phase angles during the sweeps. The seismic signals produced by the concurrently operated vibrator seismic sources are detected for each of the sweeps. The detected seismic signals are correlated separately with each of the corresponding pilot signals which were used to drive the vibrator seismic sources that produced the detected seismic signal. The correlating process produces first and second separate correlated records for each of the sweeps. The first correlated records from each sweep are summed to produce a first seismic record which is derived only from a first of the concurrently operated vibrator seismic sources. The second correlated records from the sweeps are summed to produce a second seismic record which is derived only from the second of the vibrator seismic sources. The harmonic distortion caused by the vibrator seismic sources is further reduced by having a plurality of uniform phase differences for each of the pilot signals within each of the pilot sweeps for the vibrator sources.

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