Well log stratigraphy in the central and southern offshore area of the Taranaki Basin, New Zealand

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Roncaglia, L.; Fohrmann, M.; Milner, M.; Morgans, H.E.G.; Crundwell, M.P. 2013 Well log stratigraphy in the central and southern offshore area of the Taranaki Basin, New Zealand. Lower Hutt, N.Z.: GNS Science. GNS Science report 2013/27 iii, 26 p. + 5 enclosures

Abstract: As a result of a lithological, sedimentological and biostratigraphic study of well sections from the central-southern area of the Taranaki Basin (including the Maari, Maui and Tui Fields), the lithostratigraphic framework for the siliciclastic Late Cretaceous to Recent sediments of the area is revisited and interpreted in terms of wireline log signature and associated regional seismic reflectors. The Pakawau, Kapuni, Moa, Ngatoro, Waiti and Rotokare Groups of previously published lithostratigraphic schemes are adequate for a subdivision of the central area at formation level. The Manganui Formation is subdivided into three mudstone-dominated units: lower, mid and upper. Four new, stratigraphically independent, informal, sandstone units – the “M2A sand”, a Waiauan interbedded sandstone unit (“Sw sands”) and two Tongaporututuan interbedded sandstone units (“Tt sand 1 and 2”) – are identified and represent extentions of “Moki Formation” type facies and represent potential stratigraphic members of the Manganui Formation. Reference intervals are established in wells for all units and the description of their lithology, log characteristics, depositional environment, age and associated seismic reflectors are updated with details on well to well correlation. (auth)