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Biostratigraphic review of wells in the vicinity of Cape Egmont fault zone, Taranaki

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    Cooper, R.A.; Crampton, J.S.; Crundwell, M.P.; Morgans, H.E.G.; Scott, G.H.; Strong, C.P.; Jones, C.M. 2000 Biostratigraphic review of wells in the vicinity of Cape Egmont fault zone, Taranaki. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2000/08 27, [49] p.

    Abstract: This report was originally prepared as a confidential Clint Report for MIM Petroleum Exploration Pty. Ltd. in 1994 but has now been reclassified as an open file report due to the expiry of the five year confidentiality period. Sequences drilled in the vicinity of Cape Egmont Fault Zone pose problems for seismic interpretation and biostratigraphic correlation which prevent good understanding of the history of upper Miocene depositional systems in the region and its structural development. To assist in the solution of these problems this report updates middle Miocene-Pliocene foraminiferal biostratigraphic data from the Cape Egmont wells and correlates them with control sequences in Witiora-1 and Kaimiro-1, respectively to the west and east of Cape Egmont Fault Zone. Graphic correlation diagrams, based on the same data, are used to identify suspect biostratigraphic datums, condensed sequences or breaks, and display relative rates of sedimentation. In addition, upper Miocene foraminiferal populations in all six wells were analysed quantitatively as a basis for inferences about bathymetry, water masses, sequence breaks, condensed sections, non-marine horizons and zones of oxygen deficiency. Although some of the data are related to a top Miocene seismic reflector, the study attempts neither to synthesise all of the biostratigraphic signatures nor to integrate them with seismic data. Rather the aim is to summarily present aspects of the biostratigraphic and environmental data that may be useful in multidisciplinary interpretations. (auth)

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