Biostratigraphy of Te Whatu 1 & 2 offshore petroleum exploration wells, southwestern Taranaki Basin

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SR_1993-023-pdf
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Strong, C.P.; Mildenhall, D.C.; Scott, G.H. 1993 Biostratigraphy of Te Whatu 1 & 2 offshore petroleum exploration wells, southwestern Taranaki Basin. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 93/23. 41 p.

Abstract: Te Whatu-1 and -2 offshore wells were drilled during October and November, 1987, for Petrocorp by Triton International, using the Zapata Arctic rig. The well site was at Lat. 40 04'06.3" South; Long. 172 59'14.3" East. Te Whatu-1 was plugged and abandoned at 936 m because of technical problems; Te Whatu-2 was subsequently drilled to a total depth of 3542 m at a location about 35 m southeast of Te Whatu-1. Paleontological examination of cuttings samples from the two adjacent wells during and after drilling provided the following biostratigraphy, as based on foraminifera (from 350-ca. 3200 m) and palynomorphs (below ca. 3200 m): 350-400 m. Nukumuruan Middle to outer shelf; ca.425 m. Unconformity; 450 m. Upper Tongaporutuan-lower Kapitean (Outer shelf); 500-1700 m. Tongaporutuan (Middle to outer shelf, deepening to bathyal downhole); 1800-2100 m. Waiauan (Bathyal); 2200-2700 m. Lillburnian (Bathyal); 2800-3000 m. Clifdenian (Bathyal); 3035-3100 m. Altonian (Bathyal); 3115 m. Unconformity; 3132-3165 m. Whaingaroan-Runangan, probably all Ar. Mid to outer shelf?; 3225m.-T.D. Bortonian-Kaiatan (Swamp, non-marine). (auths)