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Extended marine arrays versus simulated extended arraysNormal access

Author: M.M. ROKSANDIĆ½
Journal name: Geophysical Prospecting
Issue: Vol 34, No 8, December 1986 pp. 1154 - 1166
DOI: 10.1111/j.1365-2478.1986.tb00520.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 587.93Kb )

Summary:
Two factors are responsible for the fact that an extended marine source array performs better than a point source:

1. a higher degree of transmission of the radiated seismic energy through the water-sediment interface providing a better penetration;

2. filtering effects.

The higher degree of transmission is due to: (a) the directivity of extended sources, (b) the lower reflection coefficient at the water-sediment interface for seismic waves radiated from an extended source array than for spherical seismic waves radiated from a point source, (c) the lower amplitude decay of the pulses from an extended source than from a point source. In addition, signature characteristic of an extended source array and Fresnel zone of waves generated by such a source differ from those corresponding to a point source.

The propagating wavelet radiated from a point source array may not be, in a sedimentary sequence below the sea-floor, the linear combination of wavelets emitted from point sources. In such cases, there is a noticeable difference between the performance of a field-implemented source array and that of the corresponding simulated source array. The performances of the field-implemented and simulated extended receiver arrays can be identical if the recording system is adequate and the processing technique appropriate.


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