Quantitative Seismic Interpretation for Characterizing Carbonate Diagenesis – an Elk/Antelope Gas Field Study.

Adrian Goldberg; Moyra Wilson; Sioni Sioni

doi:10.1081/22020586.2010.12041947

ISSN: 2202-0586
E-ISSN:

oa Quantitative Seismic Interpretation for Characterizing Carbonate Diagenesis – an Elk/Antelope Gas Field Study.
Authors Adrian Goldberg^a, Moyra Wilson^b and Sioni Sioni^c
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^a InterOil Australia, POB 6567 Cairns QLD 4870, Australia, [email protected] ^b Curtin University, POB U1987 Perth WA 6845, Australia, [email protected] ^c InterOil Australia, POB 6567 Cairns QLD 4870, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12041947
- Published online: 01 Dec 2010

Abstract

Summary

The Elk/Antelope gas field is hosted in Miocene reefal and deepwater carbonates in Papua New Guinea. The carbonates exhibit multiple diagenetic overprints and complex internal seismic reflector heterogeneity.

The objective of this study is to identify the main cause(s) of seismic reflectors within the Elk/Antelope gas field and to ascertain if diagenetic boundaries are resolvable in seismic data.

Wireline logs in the Antelope-1 and Antelope-2 wells were corrected and P-Impedance logs were generated. Wireline logs were correlated with thin section petrological studies to characterize lithological facies and diagenetic overprint. A well to 2D seismic tie for the Antelope-1 well was generated and forward modelling of synthetic seismic was conducted at the Antelope-2 well.

We find that the dominant control on seismic reflection events within the reservoir are porosity variations. Lithological variations due to diagenetic overprint exert a secondary influence. Within the reservoir at the Antelope-1 well, chronostratigraphic boundaries are associated with the highest amplitude seismic reflection events. At the Antelope-2 well we model two prominent reflectors below the top carbonate event and we interpret these events to be related to diagenetically controlled porosity variation.

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References

Eberli, G.P., Baechle, F., Anselmetti, F., and Incze, M., 2003. Factors controlling elastic properties in carbonate sediments and rocks. The Leading Edge, 22, 654-660.
Fournier, F., and Borgomano, J., 2007. Geological significance of seismic reflectors and imaging of the reservoir architecture in the Malampaya gas field (Philippines). AAPG Bulletin, 91, 235-258.
Gardner, G.H.F., Gardner, L.W., and Gregory, A.R., 1974. Formation velocity and density - The diagnostic basics for stratigraphic traps. Geophys., 39, 770-780.
Goldberg, A., and Holland, D. 2008. Inversion Tectonics and the Structural Development of the Elk/Antelope Gas Field, Papua New Guinea. In: Blevin, J. E., Bradshaw, B. E., and Urunski, C., (Eds), Eastern Australasian Basins Symposium III, Petroleum Exploration Society of Australia, Special Publication.
Henry, S.G., 1997. Catch the (Seismic) Wavelet, AAPG Explorer, March, 1997.
Lewis, D., 2009. Antelope-1 FMI Level two Interpretation Report. Schlumberger report to InterOil (unpublished).
Lewis, D., 2010. Antelope-2 FMI, FMS Level two Interpretation Report. Schlumberger report to InterOil (unpublished).
Liu, H.P., Anderson, D.L., and Kanamori, H., 1976, Velocity dispersion due to anelasticity; implications for seismology and mantle composition: Geophysical Journal of the Royal Astronomical Society, 47, 41-58.
Schlager, W., 1999. Sequence stratigraphy of carbonate rocks. The Leading Edge, 18, 901-907
White, R., and Simm, R., 2003. Tutorial: Good practice in well ties. first break, 21, 75-83.
Wilson, M.E.J., 2009. Antelope-1: Carbonate petrography. Report to InterOil (unpublished).
Wilson, M.E.J., 2010a. Antelope-2: Core log description, petrology, environmental & preliminary diagenetic interpretation with implications for reservoir quality. Report to InterOil (unpublished).
Wilson, M.E.J., 2010b. Antelope-1: FMI and carbonate petrography comparison. Report to InterOil (unpublished).
Wylie, M.R.J., Gregory, A.R., and Gardner, L.W., 1956. Elastic wave velocities in heterogeneous and porous media. Geophys., 21, 41-70.

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Article Type: Research Article

Keyword(s): Carbonate; Diagenesis; Dolomite.; Quantitative Interpretation

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oa Quantitative Seismic Interpretation for Characterizing Carbonate Diagenesis – an Elk/Antelope Gas Field Study.

Abstract

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