Strategies for waveform processing in sparker data |
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| Authors: | Mathieu J Duchesne Gilles Bellefleur Mike Galbraith Randy Kolesar Rick Kuzmiski |
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| Institution: | (1) Geological Survey of Canada-Québec, 490 rue de la Couronne, Quebec, Canada, G1K 9A9;(2) Geological Survey of Canada-Central, 615 Booth Street, Ottawa, ON, Canada, K1A 0E9;(3) Geophysical Exploration and Development Corporation, Suite 1200, 8th avenue South West, Calgary, AB, Canada, T2P 3P2 |
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| Abstract: | A sparker is a marine seismic impulsive source used for high-resolution seismic surveys. Sparker sources were very popular
during the late 1960s and 1970s before being supplanted by small volume airguns. However, in the last 10 years there has been
renewed interest in sparker technology because (1) it can be easily deployed at relatively low costs and (2) in certain areas
the use of small airguns is restricted for environmental purposes. In this study a sparker source was used to assess the seismic
stratigraphy of Quaternary deposits and to image the sediment/bedrock interface. Three different inverse filtering methods
were tested (i.e., spiking deconvolution, match-filtering and vertical seismic profile (VSP) deconvolution) to correct the
poor shot-to-shot repeatability of the source and to compress its reverberations. Results show that the matched-filter and
VSP deconvolution methods, which design and apply one operator for each shot, produced comparable results, whereas the spiking
deconvolution that used the same operator on all traces failed to compress the source signature properly. |
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| Keywords: | Marine seismic reflection Waveform Attenuation Deconvolution Matched-filter Sparker |
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