3-d seismic survey using multiple sources simultaneously

Details 3-d seismic survey using multiple sources simultaneously 3-d seismic survey using multiple sources simultaneously

G - Physics

01

V

G01V 1/00 (2006.01) G01V 1/02 (2006.01)

Patent

CA 2185751

In three-dimensional seismic surveys using the Vibroseis system, cost savings can be made if multiple sources are used simultaneously, into the same set of geophones. Each source radiates a distinctive source signal, so that reflections generated by each one may be separated from those generated by the others. These signals should have little or no correlation with each other, and each should be substantially immune from harmonic distortion present in any of the others. The invention employs long but identical swept-frequency signals, for which the time to sweep through one octave exceeds twice the maximum seismic travel time of interest. For one swept-frequency signal a frequency-time space is defined between the signal itself and a nominated harmonic (for example, the second), and the other swept-frequency signals are accommodated within partitions of this frequency-time space. The invention is particularly appropriate to inexpensive swinging-weight vibrators.

Dans les relevés sismiques tridimensionnels utilisant le système Vibroseis, on peut réaliser des économies en se servant simultanément de sources multiples dans le même ensemble géophonique. Chaque source émet un signal précis, permettant de distinguer leur réflexion respective. Ces signaux devraient avoir peu ou pas de corrélation entre eux, et chacun devrait être sensiblement protégé contre la distorsion harmonique d'un autre signal. La présente invention se sert de signaux à balayage de fréquence longs mais identiques, pour lesquels le temps de balayage d'un octave dépasse doublement le temps maximal de parcours de l'onde séismique en question. Pour un signal à balayage de fréquence, un espace de temps de fréquence est défini entre le signal lui-même et une harmonique désignée (par exemple, la seconde), et les autres signaux à balayage de fréquence sont reçus dans des subdivisions de l'espace de temps de fréquence. Cette invention convient particulièrement aux vibrateurs peu coûteux de balancement de masses.

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