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Book Chapter

Structural styles in the Papuan Fold Belt, Papua New Guinea: constraints from analogue modelling

By
Kevin C. Hill
Kevin C. Hill
1
Oil Search Limited
,
Angel Place, 123 Pitt Street, Sydney, NSW
Australia 2000
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Katie Lucas
Katie Lucas
2
Geological Sciences and Geological Engineering
,
Miller Hall, Queen's University
,
Kingston, Ontario, K7L 3N6
,
Canada
3
Present address:
Premier Gold Mines
,
401-1113 Jade Court, Thunder Bay, Ontario
,
P7B 6M7
,
Canada
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Keith Bradey
Keith Bradey
1
Oil Search Limited
,
Angel Place, 123 Pitt Street, Sydney, NSW
Australia 2000
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Published:
January 01, 2010

Abstract

Cross sections, seismic data and centrifuge analogue modelling reveal the structural styles in the oil-producing areas of the Papuan Fold Belt. They include inverted basement faults, detachment faults in the Jurassic section 1–2 km beneath the Neocomian Toro Sandstone reservoir, and tight, overturned folds in the reservoir sequence with stretched and boudinaged forelimbs, cut by break-thrusts. Additional features include highly variable thicknesses in the Cretaceous Ieru Formation, the regional seal sequence, including through-going detachments that isolate the overlying thick Miocene Darai Limestone. Centrifuge analogue modelling of intact, plane-layered strata determined that the mechanical stratigraphy and the thickness of weak beds above the lower décollement horizon exert the greatest control on the structural style. Large-offset thrust faults were only produced in models with pre-cut faults, generating early inversion and then large ramp anticlines, similar to those in the Kutubu Oilfield, which has reserves of >350 million barrels. It is suggested that the Kutubu Oilfield trend was underlain by a large normal fault and that, by analogy with the Vulcan Sub-basin, oil-rich source rocks may be confined to the hanging wall or north side of this fault. Oil would have been generated and expelled during thin-skinned deformation.

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Contents

Geological Society, London, Special Publications

Hydrocarbons in Contractional Belts

G. P. Goffey
G. P. Goffey
PA Resources UK Ltd, UK
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J. Craig
J. Craig
Eni Exploration and Production Division, Italy
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T. Needham
T. Needham
Needham Geoscience Ltd, UK
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R. Scott
R. Scott
CASP, University of Cambridge, UK
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Geological Society of London
Volume
348
ISBN electronic:
9781862395961
Publication date:
January 01, 2010

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