Method for determining the far-field signature of an air gun arr

Details Method for determining the far-field signature of an air gun arr Method for determining the far-field signature of an air gun arr

1985-01-07

1987-04-14

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367144, 181110, 181118, G01V 138, G01V 116

Patent

active

046583840

ABSTRACT:
The far-field pressure signature of an air-gun array is derived from near-field measurements. An array of air guns is deployed in the water at a desired depth. A hydrophone is suspended in the middle of the array at the same depth so that the guns are equidistant from the hydrophone. The lateral spacing between the guns and the sensor is much less than the water depth of the guns. Having fired the guns, the ghost reflection amplitude in the near field will be much less than the amplitude of the direct arrivals and can be ignored. The far-field signature is determined by inverting the observed pressure signature, delaying it in proportion to array depth and adding the inverted, delayed signature back to the original signature.

REFERENCES:
patent: 3866161 (1975-02-01), Barr, Jr. et al.
patent: 4476550 (1984-10-01), Ziolkowski et al.
patent: 4476553 (1984-10-01), Ziolkowski et al.

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