1887
Volume 5, Issue 1
  • ISSN: 0263-5046
  • E-ISSN: 1365-2397

Abstract

Data from the Delft Air Gun Experiment demonstrate the success of a new method to determine the far-field signature of a marine seismie source array from nearfield measurements. The method requires the wavefield of the array to be measured in the near field with hydrophones of known relative sensitivity and in a known geometrical configuration with respect to the monopole source elements within the array. If there are n such source elements, at least n near-field hydrophones are required to determine the wavefield. The results from a North Sea line shot with a tuned airgun array show that the signature deconvolution for the wavelet calculated from these near-field measurements is at least as effective as the signature deconvolution for the measured far-field signature. The same line was shot again with the air guns out of synchronisation by as much as 100 ms; the data from the near-field hydrophones allow a deterministic signature deconvolution to be performed to yield a section very similar to that obtained with the tuned array. Without this signature deconvolution on the detuned data, the recovered section is unacceptable. The full power of the method lies in its ability to specify the whole wavefield for each shot. Thus shot-to-shot variability and source directivity may be taken into account in processing. This power has not been exploited in the results presented here.

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/content/journals/10.3997/1365-2397.1987002
1987-01-01
2024-03-29
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http://instance.metastore.ingenta.com/content/journals/10.3997/1365-2397.1987002
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  • Article Type: Research Article
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