Using AVO to map Cooper Basin Permian sands in the presence of coal

Stephanie Tyiasning; Dennis Cooke

doi:10.1071/ASEG2015ab094

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Using AVO to map Cooper Basin Permian sands in the presence of coal
Authors Stephanie Tyiasning^a and Dennis Cooke^b
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^a The University of Adelaide, Adelaide, [email protected] ^b The University of Adelaide & ZDAC Geophysical Technologies, Adelaide, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab094
- Published online: 01 Dec 2015

Abstract

Cooper basin Toolachee and Patchawarra sands are difficult to map due to strong seismic reflections from Permian coals. Seismic amplitudes are mainly driven by coal thickness instead of lithology (sand vs shale). We proposed a method for obtaining better sand prediction. This method uses AVO intercept (I) and gradient (G) and the Extended Elastic Impedance (EEI) to highlight the subtle differences between coal-shale and coal-sand interfaces. We test this method by creating several wedge models to understand the effect of coal thickness and lithology on seismic amplitudes. Results are compared with a more traditional method that recognizes a ‘channel’ pattern on stacked seismic and uses a geologic facies model to locate sand with respect to that channel. For the 3D survey used here, our EEI-AVO method ‘finds’ sand in locations predicted by the traditional facies model method as well as in new locations.

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References

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Article Type: Research Article

Keyword(s): AVO intercept and gradient; Coal amplitude; coordinate rotation; sand prediction; tuning

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