High frequency enhancement of sparker sub bottom profiles with multichannel reflection processing

Leonie E. A. Jones

doi:10.1071/ASEG2013ab240

ISSN: 2202-0586
E-ISSN:

oa High frequency enhancement of sparker sub bottom profiles with multichannel reflection processing
Authors Leonie E. A. Jones^a
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^a Geoscience Australia, GPO Box 378, Canberra, , ACT, 2601, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2013, Issue ASEG2013 - 23rd Geophysical Conference, Dec 2013, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2013ab240
- Published online: 01 Dec 2013

Abstract

The Petrel Sub-basin Marine Survey was undertaken in May 2012 by Geoscience Australia and the Australian Institute of Marine Science to support assessment of CO2 storage potential in the Bonaparte Basin. The aim of sub bottom profiling was high resolution data to investigate regional seal breaches and potential fluid pathways.

The sub bottom profiler data were acquired aboard the AIMS RV Solander, a total of 51 lines and 654 line km. Acquisition employed a Squid 2000 sparker and a 24 channel GeoEel streamer. Group interval of 3.125 m and shot interval of 6.25 m resulted in 6 fold stacked data. Record length was 500 ms, sampled every 0.25 ms. Rough sea conditions during the trade winds resulted in obvious relative motion between source and streamer.

Multichannel seismic reflection processing compensated for most of the limitations of sparker acquisition. Front end mute and band pass filter removed low frequency noise. Non surface consistent trim statics corrected for the relative motion of sparker and streamer, aligning reflections pre stack and improving signal to noise. Post stack minimum entropy deconvolution both suppressed ghosting and enhanced high frequencies (>1000 Hz). Vertical resolution of better than 1 m allowed delineation of multiple episodes of channelling in the top 100 m of sediment. Imaging of small channels was improved by collapsing diffractions with finite difference migration.

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2026-01-15

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References

Bellefleur, G., Duchesne, M.J., Hunter, J., Long, B.F. and Lavoie, D., 2006, Comparison of single- and multichannel high-resolution seismic data for shallow stratigraphy mapping in St Lawrence River estuary, Quebec: Current Research 2006-D2, Geological Survey of Canada.
Carroll, A.G., Jorgensen, D.C., Siwabessy, P.J.W., Jones, L.E.A., Sexton, M.J., Tran, M., Nicholas, W.A., Radke, L.C., Carey, M.P., Howard, F.J.F., Stowar, M.J., Heyward, A.J., Potter, A. and Shipboard Party, 2012, Seabed environments and shallow geology of the Petrel Sub-Basin, northern Australia: SOL5463 (GA0335) - post survey report: Record 2012/66, Geoscience Australia, Canberra.
Duchesne, M.J., Bellefleur, G., Galbraith, M., Kolesar, R. and Kuzmiski, R., 2006, Strategies for waveform processing in sparker data: Marine Geophysical Researches, DOI 10.1007/s11001-007-9023-8.
Gutowski, M., Breitzke, M and Spieß, V., 2002, Fast static correction methods for high-frequency multichannel marine seismic reflection data: A high-resolution seismic study of channel-levee systems on the Bengal Fan: Marine Geophysical Researches 23, 57-75.
Jones, L.E.A., 2012, Petrel Sub-basin Marine Survey (GA- 0335/SOL5463) (NLECI Program) - Processed sub bottom profiler data: Web Dataset, Catalogue No. 75061, Geoscience Australia, Canberra.
Jones, L.E.A., 2013, Petrel Sub-Basin Marine Survey (GA0335/SOL5463) - Sub Bottom Profiler Processing Report: Record 2013/xx, Geoscience Australia, Canberra.
Spinoccia, M., 2012, Petrel Sub-basin Marine Survey (GA- 0335/SOL5463) (NLECI Program) - High resolution bathymetry grids: Web Dataset, Catalogue No. 74866, Geoscience Australia, Canberra.

/content/journals/10.1071/ASEG2013ab240

Article Type: Research Article

Keyword(s): marine statics; multichannel reflection processing; Petrel Sub-basin; sparker; sub bottom profiles

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