Lateral Velocity Variations in the Darai Limestone, Papua New Guinea Foreland

Andrew Nelson; Ben Turner

doi:10.1071/ASEG2015ab245

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

ISSN: 2202-0586
E-ISSN:

oa Lateral Velocity Variations in the Darai Limestone, Papua New Guinea Foreland
Authors Andrew Nelson^a and Ben Turner^b
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^a Horizon Oil Ltd, 7/134 William St NSW, 2011, [email protected] ^b Dayboro Geophysical Pty Ltd, Suite 5 Leitchs Rd QLD, 4500, [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/ASEG2015ab245
- Published online: 01 Dec 2015

Abstract

A combination of exploration and appraisal drilling results from wells on three adjacent discoveries in the Papuan Basin, western Papua New Guinea foreland, shows significant lateral velocity variation across the more than 1 km thick Darai Limestone. Investigation suggests that these are due to alteration, including dolomitisation, of the limestone. Most alteration appears associated with small scale faulting which is typically crestal. Seismic processing velocities are key to establishing the velocity profiles between wells required for depth conversion. Seismic forward modelling studies based on predicted high velocity bodies show processing velocities can develop an oscillatory behaviour in the vicinity of abrupt lateral velocity changes similar to those that may accompany dolomitisation. Similar results are observed on some of the field data.

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2015-12-01

2026-01-18

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References

Anselmetti, F.S., and Eberli, G.P., 1993, Controls on Sonic Velocity in Carbonates.: Pure and Applied Geophysics 141, 2/3/4, 287-193.
Hollis, C., Corlett, H., Hirani, J., Hodgetts, D., Gawthorpe, R.L., Rotevan, A., and Batesten, E., 2012, Fault/Fracture Related Dolomitisation of the Eocene Thebes Formation, Hammam Fauran Fault Block, Gulf of Suez.:AAPG Search and Discovery Article #50665 (2012).
Mylroie, J.E., Mylroie J.R., and Jenson, J.W., 2004, Modeling Carbonate Island Karst in Lewis R.D. and Panuska, B.C., (Eds) Proceedings of the 11th Symposium of the Geology of the Bahamas and other Carbonate Regions.
New York State Museum Reservoir Characterization Group, (undated), An Introduction to New York’s Trenton/Black River Play.;http://www.westernls.com/ny/TBR_Play.pdf
Slater, B.E., 2007, Outcrop Analog for Lower Paleozoic Hydrothermal Dolomite Reservoirs, Mohawk Valley, NY; Masters Thesis, University at Albany, State University of New York.

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Article Type: Research Article

Keyword(s): dolomitisation; limestone; processing; seismic; velocity

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oa Lateral Velocity Variations in the Darai Limestone, Papua New Guinea Foreland

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