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An Active Petroleum System in the New Ireland Basin: Papua New Guinea’S New Frontier Miocene Carbonate Play

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An Active Petroleum System in the New Ireland Basin: Papua New Guinea’S New Frontier Miocene Carbonate Play An Active Petroleum System in the New Ireland Basin: Papua New Guinea’s New Frontier Miocene Carbonate Play Brent I.A. McInnes1,2 and Said Amiribesheli3 1Curtin University 2Peak Oil (PNG) Pty Ltd 3Discover Geoscience Introduction The New Ireland Basin (NIB) is a 900 km x 180 km frontier basin in NE Figure 1 N Papua New Guinea, bounded by the New Ireland and Manus Islands to the south and the Manus-Kilinailau submarine trench to the north (Fig. Pacific Plate 1). The petroleum potential of the NIB was considered favourable Submarine - following international marine seismic surveys in the mid-1980’s, with Tabar Gp Hydrocarbon Manus Island Kavieng Lihir Gp Seep Miocene carbonate buildups as potential plays. Ontong Tanga Gp Java Plateau In 2017, Searcher Seismic and BGP carried out a long offset, deep tow Feni Gp Rabaul SS2017 2D multiclient seismic survey (SS2017) across the NIB. The seismic lines L ines reveal substantial sediment thicknesses (up to 8 km) and structures throughout the basin (Fig. 2). High-resolution images of possible Miocene carbonate buildups and ramp deposits (Fig. 3) are a significant New Britain Mainland breakthrough. The existence of these favourable reservoir lithologies, PNG L'Etoile 1 combined with the discovery of active thermogenic HC seeps1 offshore 0 40 80 120 160 200 New Ireland (Fig. 1; red star), indicate that detailed exploration of this Kilometres frontier basin is warranted. Basin Architecture VE = 3.4 Figure 2 - 1km A ~70 km long NE-SW seismic line across the basin indicates sediment A-B SB-A B-C accumulations of at least 8 km in some areas (Fig. 2), with preliminary 3km 2km seismic interpretations based on Exon and others2: 4km SB-A: Pleistocene to Recent hemipelagic oozes 5km A-B: Pliocene volcaniclastic turbidites, interbedded with marls/chalk C-D B-C: L Miocene/E Pliocene chalk interbedded with volcanic turbidites C-D: Early to Late Miocene carbonate shelf (Lelet Lst equivalent) D-E Manus-K ilinailau D-E : E Miocene outer shelf and slope sediments, largely volcaniclastic T with possible carbonate banks (Lossuk River Beds equivalent) enchr E-V: Eocene to E Miocence volcanics (Jaulu Volcanics equivalent). Normal faults, flower structures and igneous sills transect the section. 11km 10km 9km 8km 7km 6km E-V Fast-track PSDM Miocene Carbonate Platform Sediments A second seismic line (Fig. 3) off the New Ireland coast reveals sedimentary deposits with characteristics similar to carbonate ramp 1km Figure 3 A-B deposits in modern reef environments. Features include carbonate buildups or bioherms (BH) and chaotically layered prograding slope 2km BH sediments representing potential fore-reef talus deposits (FRT). B-C Miocene framework reefs would be expected near the apex of the 3km change of slope (yellow lines) of the ramp deposits (c.f. inset model3). The carbonate platform was drowned and subsequently buried by 4km Pliocene-Pleistocene chalks and volcanic turbidites (A-B & B-C units). FRT 5km These offshore units are correlative with massive exposures on New Ireland (up to 1 km thick) of Miocene foraminiferal-algal biomicrite C-D sediments (Lelet Limestone; Fig. 4) deposited in a backreef setting2. The 6km Lelet formation includes coal-bearing subunits (Matakan Unit; Fig. 5), Fast-track PSDM formed in reducing lagoonal environment.4 A potential modern analogue for these Miocene deposits is the island of Bora Bora (Fig. 6). Figure 4 Figure 5 Modern Analogue (Bora Bora) Figure 6 Lelet Limestone (Backreef biomicrite) Matakan Coal (Lagoonal) References Acknowledgements 1. Schmidt et al (2002): Chemical Geology 186, 249-264. Thanks to Searcher Seismic for permission to use SS2017 Fastrack PSDM results in this 2. Exon et al (1986): BMR J of Australian Geology & Geophysics 10, 39-51. poster. The assistance of Michael Nongkas and Daniel Gebo during fieldwork is appreciated. 3. Braithwaite et al. 2000. Int. J. Earth Sci. 89, 431–445. 4. Glikson and Owen (1986): J SE Asian Earth Sciences 1, 221-234..
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