Near-surface seismic expression of gas chimneys in the Perth Basin

James Leven; Mike Middleton

doi:10.1071/ASEG2007ab074

ISSN: 2202-0586
E-ISSN:

oa Near-surface seismic expression of gas chimneys in the Perth Basin
Authors James Leven^a and Mike Middleton^b
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^a GeoSeis Pty Ltd, PO Box 250 Mt Lawley, , WA, , 6929, [email protected] ^b BPC Ltd, 16 Ord Street, West Perth, , WA, , [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab074
- Published online: 01 Dec 2007

Abstract

Summary

Shallow anomalous high speed events, evident on the shot gathers, are observed to be associated with gas chimneys in the Central Perth Basin. Shot gathers in the vicinity of gas chimneys display these events, which have apparent speeds of around 3000 m/s in the uppermost 300 ms, and appear to localised around the gas chimneys.

These high speed events have been investigated using existing seismic data from the region, with these high speed events modelled using wide aperture seismic (WAS) techniques.

Understanding the effect of these shallow high speed layers is important for the following reasons -

1. they may provide support for a petroleum prospect,

2. they may represent a possible geohazard during drilling,

3. these high speed layers can have a profound effect on the seismic imaging of the underlying strata.

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References

Aminzadeh, F., 2004, Hydrocarbon phase detection and other applications of chimney technology. AAPG Intern. Conf, Oct 24-27 2004, Cancun, Mexico.
Floodgate, G.D., and Judd, A.G., 1992. The origins of shallow gas. In: Davis, A.M., (ed.) Methane in marine sediments. Cont. Shelf Res., 12: 1145-1156.
Rollet, N., Logan, G.A., Kennard, J.M., O’Brien, P.E., Jones, A.T., and Sexton, M., 2006. Characterisation and correlation of active hydrocarbon seepage using geophysical data sets: An example from the tropical carbonate Yampi Shelf, Northwest Australia. Marine and Petroleum Geology, 23, 145-164.
Schroot, B.M., 2001, Surface and subsurface expression of shallow gas accumulations in the southern North Sea. AAPG Hedberg Conference, Sept 16-19 2001, Vancouver, Canada.

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Article Type: Research Article

Keyword(s): gas chimneys; shallow seismic high-speed

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oa Near-surface seismic expression of gas chimneys in the Perth Basin

Abstract

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