Determination of far field signatures, for instance of seismic s

Details Determination of far field signatures, for instance of seismic s Determination of far field signatures, for instance of seismic s

1981-08-25

1984-10-09

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367 23, 367 59, G01V 128

Patent

active

044765509

ABSTRACT:
A method is provided of ascertaining the far field signature of an array of sound source units, each of which is small compared with the wavelength of the highest frequency of interest. The units are fired so that the interactions between them is negligible. This is achieved by firing the units sequentially so that each generates all its significant radiation before the next is fired, and/or by firing more than one unit at a time and separating the units by at least one wavelength of the lowest frequency of interest. The far field signature of each unit is measured by a pressure-sensitive detector close to the unit but in a region where the phase spectrum of the pressure field is independent of azimuth and range. The far field signature of the array is derived from the measured signatures by summation.

REFERENCES:
patent: 3460064 (1969-08-01), Giles et al.
patent: 3786408 (1974-01-01), Jenkinson et al.
patent: 4353121 (1982-10-01), Ray et al.
Brandsaeter et al., "A New High-Resolution or Deep Penetration Airgun Array", Geophysics, vol. 44, No. 5, May, 1979, pp. 865-879.
Ziolkowski et al., "Wavelet Deconvolution Using a Source Scaling Law", Geophysical Prospecting, vol. 28, 1980, pp. 872-901.
Ziolkowski, "High Resolution Seismic Reflection Developments in United Kingdom Coal Exploration", Proceedings Coal Seam Discontinuities Symposium, Nov. 3-4, 1976, Pittsburg, Penn., pp. 1-17.
Ziolkowski, "Source Array Scaling for Wavelet Deconvolution", Geophysical Prospecting, vol. 28, 1980, pp. 902-918.

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