The spectral ratio technique for determining sea floor reflectivity

David C. Henley


The convolutional model of seismic signals has inspired a number of computational techniques over the years, many of them aimed at extracting one or more convolution factors, such as the wavelet or the reflectivity sequence. One such technique for marine streamer data uses the ratio of a simple multiple event to its primary to extract the reflectivity function of the sea floor interface, or the ratio of autoconvolved primary to multiple to extract an estimate of the source wavelet. This technique has been implemented in ProMAX. The method is described here and demonstrated on a model source gather as well as on a field record from the modelled region. Unique to this study is the extension of the method to the radial trace (R-T) domain, which provides a more proper geometry for the computation than the X-T domain.

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