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THE KUPE - MANAIA FAIRWAY KF Kroeger, R Funnell, M Fohrmann, M Hill

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THE KUPE - MANAIA FAIRWAY KF Kroeger, R Funnell, M Fohrmann, M Hill RECENT ADVANCES IN UNDERSTANDING TARANAKI PETROLEUM SYSTEMS: THE KUPE - MANAIA FAIRWAY KF Kroeger, R Funnell, M Fohrmann, M Hill Institute of Geological and Nuclear Sciences, PO Box 30368, Lower Hutt 5040, NEW ZEALAND Introduction Forward modelling of the basin structure The remapping of the Taranaki Basin as part of the 4D Detailed reconstruction of the basin architecture and evolution through Taranaki project at high resolution has produced a wealth of time has led to a new interpretation of carrier bed geometry. The new data. Digital integration of well data, sequence evolution of the southeastern Taranaki Basin was characterized by initial submergence along with the formation of the convergent plate stratigraphy, paleogeography and structural interpretation bounday in the east, followed by Late Miocene inversion, renewed has improved our understanding of basin architecture and subsidence and uplift of the Taranaki Peninsula. This evolution shaped evolution. These data have been used to build a high the structure along the crest of tha Manaia anticline, influenced closure, for instance at the Toru-1 well location, and controlled migration along resolution 3D PetroMod™ petroleum systems model the N-S fairway. intended to shed light on charge of traps and preservation of petroleum accumulations in the basin. S N Pliocene-Recent 0 Ma Miocene Cretaceous Paleocene Eocene-Oligocene 3 Thermal Model 1 2 To reproduce petroleum generation history, the 4 3D thermal evolution of the area was modelled, 6.5 Ma using Seismic interpretation and grids from Fohrmann et al. (2012) Regional heat flow history (Kroeger et al. 2013) 100 Age (Ma) 0 1D thermal history at Kupe-1 well site extracted from the 3D model showing: Well data (temperature and vitrinite (1) passive margin evolution and initial burial of the Taranaki Basin (2) reflectance) for calibration convergent margin evolution and cooling due to crustal thickening (3) Late 8.5 Ma Miocene uplift and erosion (4) Pliocene-Recent burial stage most relevant for Standard organofacies Type III DE kinetics petroleum formation. Manaia Anticline B B’ A Kupe South-3 A’ Kapuni-13 Kapuni-8 0 Kupe South-2 Whenuakura Fm 0 Whenuakura Fm Whenuakura Fm Tangahoe Fm 1 Tangahoe Fm 1 Tangahoe Fm Matemateaonga Fm Matemateaonga Fm Matemateaonga Fm 2 2 Mangaoapa Mbr Mangaoapa Mbr Mangaoapa Mbr Otunui Fm Otunui Fm Manganui Fm Otunui Fm 3 3 Otaraoa Fm Taimana Fm Manganui Fm 4 Taimana Fm 4 Farewell Fm Farewell Fm 5 Otaraoa Fm 5 North Cape Fm 6 16 Ma Depth (km) Depth Manganui Fm Depth (km) 6 Rakopi Fm 7 North Cape Fm Taranaki Peninsula B’ Kapuni-8 7 Otaraoa Fm 8 Kapuni-13 Rakopi Fm Median Batholith Undiff. Mid-Late Cretaceous 9 8 Undiff. Mid-Late Cretaceous 10 9 Murihiku/Brook Street Basement Murihiku/Brook Street Basement 11 Toru-1 Kupe-1 10 AKupe South-2 A’ Kupe South-1 Kupe South-3 Kupe South-4 Facies/lithology units Kupe South-5 Fluvial Outer shelf/slope A Coal measures Bathyal The 3D model consists of 15 layers interpreted from seismic Tahi-1 Coastal plain Bathyal (marly) data (Fohrmann et al. 2012) and has been further subdivided B Shoreface/shallow marine Submarine fan Above figures show the evolution of the crest of the Manaia Anticline Water Depth Shelf Submarine channel to represent facies zonations of Strogen (2011). 0 100 200 300 400 500 16 km Volcaniclastics (”Manaia Fairway”) from mid Miocene to Recent time along a N-S transect Images show lithological architecture along east-west (A-A’) and north-south (B-B’) transects through the model. B C A Rakop Formation Farewell Formation Mangahewa Formation Manaia Fault (TOC = 3 mg/g) (TOC= 3-8 mg/g) (TOC = 3.5 mg/g) Predicted Petroleum Composition Manaia Fairway N N N Above figure shows predicted petroleum generation (tons/m2 )l of A) Rakopi, B) Farewell, and C) Mangahewa Formation between Manaia and Taranaki faults. In addition, A shows modelled faults, B shows main migration pathways and predicted accumulationswithin Farewell Formation as well as contribution of source rocks to Kupe accumulation. Petroleum generation and migration Acknowlegements Results and Conclusions modelling This research was undertaken with Crown funding provided through the New Petroleum systems modelling of the area Zealand Ministry of Business, Innovation and Employment (MBIE). Data used Farewell Formation is predicted to be the most important source has provided greater detail on the timing of for high- resolution modelling were developed as part of the 4D Taranaki rock in the Kupe region. This is consistent with geochemical data source rock maturation and factors project and we thank all GNS staff involved. We also thank Schlumberger for (Sykes et al. 2012) controlling petroleum migration. Compared access to PetroMod™ software. to previously published data (i.e., Taranaki Mangahewa Formation has the potential for generating petroleum in the onshore but little charge to the south is predicted Atlas), a revised velocity model has led to a References new interpretation of burial depth of source Fohrmann, M., Hill, M., Reid, E., King, P.R., Zhu, H., Roncaglia, L., Bland, K.J., Strogen, D.P., Scott, G.P.L., 2012. Seismic reflection Gas-proneness of the Kupe Field is explained by main charge from rocks. Deeper burial and therefore higher character, mapping and tectono-stratigraphic history of the Kupe area (4D Taranaki Project), south-eastern Taranaki Basin, GNS Science mature source rocks in Farewell Formation north of the Toru-1 well Report 2012/36. GNS Science, Lower Hutt. 62pp maturity could partly explain the gas with additional recent charge from Farewell coal seams proximal Kroeger, K.F., Funnell, R.H., Nicol, A., Fohrmann, M., Bland, K.J., King, P.R., 2013. 3D crustal-scale heat-flow regimes at a developing active proneness of this part of the basin. margin (TaranakiBasin, New Zealand). Tectonophysics591, 175-193. to the field Migration was controlled by the changing Strogen, D.P.,2011. Updated paleogeographic maps for the TaranakiBasin and surrounds, GNS Science Report 2010/53, Lower Hutt, 83pp. The geometry of the Manaia Fairway and trap closure is controlled geometry of the Manaia Anticline and Sykes, R.; Zink, K.-G.; Rogers, K.M.; Phillips, A.; Ventura, G.T. 2012. New and updated geochemical databases for New Zealand petroleum by the history of burial and basin inversion faulting of the carrier beds and reservoirs. samples, with assessments of genetic oil families, source age, facies and maturity. GNS Science Consultancy Report 2012/37, 29pp Later stage faulting affected seal integrity..
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