Biostratigraphic revision of petroleum exploration wells, Great South Basin, New Zealand

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Raine, J.I.; Strong, C.P.; Wilson, G.J. 1993 Biostratigraphic revision of petroleum exploration wells, Great South Basin, New Zealand. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/32 146 p.

Abstract: This report contains detailed reviews of foraminiferal and palynological biostratigraphy for seven petroleum exploration wells in the Great South Basin, south of New Zealand, based on existing samples in IGNS collections, and new material. Five of the wells, Hoiho-1C, Kawau-1A, Pakaha-1, Tara-1 and Toroa-1 were drilled by Hunt International Petroleum Co. in the late 1970s; for these wells this study revises work carried out by the New Zealand Geological Survey at the time of drilling. Pukaki-1 and Rakiura-1, drilled by Placid Oil in the early 1980s, were not previously studied by this organisation. Although the reviews do not indicate a fundamental departure from previous dating of the mid-Cretaceous to Neogene sequence of the basin, many minor changes in dating of the individual well sequences are suggested, and advances in dating (particularly from dinoflagellates) and paleoenvironmental interpretation incorporated. (auths)