Modelling the Effects of Thin Beds on Amplitude Versus Offset Response Using the Campbell-2 Well

Marianne Windhofer; Mark Stevens; Peter Kirk

doi:10.1071/EG993847

ISSN: 0812-3985
E-ISSN: 1834-7533

Modelling the Effects of Thin Beds on Amplitude Versus Offset Response Using the Campbell-2 Well
Authors Marianne Windhofer^a, Mark Stevens^a and Peter Kirk^a
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^a Simon Petroleum TechnologyAustralia Pty Ltd
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 24, Issue 3-4, Sep 1993, p. 847 - 857
DOI: https://doi.org/10.1071/EG993847
- Published online: 01 Sep 1993

Abstract

Studies of Amplitude Variations with [Versus] Offset (AVO) have been used in Australia and worldwide to evaluate possible hydrocarbon prospects. This study concentrates on modelling the effects of thin beds (carbonates, shales) above and within sandstones on AVO behaviour.

Forward modelling of synthetic gathers from the Campbell-2 well has confirmed that the strongly anomalous AVO response observable over the gas and oil field is due to the hydrocarbon column in the Flag Sandstone of the Barrow Group. Modelling presented here shows that a 5 m thick shale with its top 15 m below the top of the reservoir modified the AVO response of the top of the reservoir, but this response is still strongly anomalous. However, modelling a reservoir with two 5 m thick shale beds located 5 m and 15 m below the top of the reservoir modified the AVO response of the top of the reservoir to the extent that the AVO response is not significantly anomalous.

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References

Krief, M., Garat, J., Stellingwerff, J., and Ventre, J. (1990), ‘A petrophysical interpretation using the velocities of P and S waves (full-waveform sonic)’, The Log Analyst31, 355–369.
Micenko, M. (1992), ‘AVO and inversion mapping — Campbell Gas Field, Barrow Sub-Basin, W.A.’, Explor. Geophys.23, 213–218.
Ostrander, W.J. (1984), ‘Plane-wave reflection coefficients for nonnormal angles of incidence’. Geophysics49, 1637–1648.
Sheriff, R. (1991), Encyclopedic Dictionary of Exploration Geophysics, Society of Exploration Geophysicists. Tulsa, Oklahoma. 3rd edit., 376 pp.
Shuey, R.T. (1985), ‘A simplification of the Zoeppritz equations’, Geophysics50, 609–614.
Walden, A.T. (1991), ‘Making AVO sections more robust’, Geophysical Prospecting39, 915–942.
Ward, J. (1992), ‘AVO calibration — ideas based on a sandstone model’, In SEG/EAEG Summer Research Work-Shop, How Useful is Amplitude-Versus-Offset (AVO) Analysis?. Big Sky, Montana.

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Article Type: Research Article

Keyword(s): AVO; Campbell-2; Carnarvon Basin.; Flag Sandstone; thin beds

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Modelling the Effects of Thin Beds on Amplitude Versus Offset Response Using the Campbell-2 Well

Abstract

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