New Zealand Journal of Geology and Geophysics abstracts
Petroleum potential and oil-source correlation in the Great South and
Canterbury Basins
S. D. KILLOPS
R. A. COOK
R. SYKES
Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
J. P. BOUDOU
Université Pierre et Marie Curie
Laboratoire de Géochimie et Métallogénie
4 Place Jussieu, 75252 Paris, Cedex 05, France
Abstract Pyrolytic analyses suggest that Cretaceous coaly
sediments in the Great South and Canterbury Basins, southeast and east of South
Island, New Zealand, exhibit mixed oil and gas potential, like their
counterparts in Taranaki Basin. On the basis of isotopic and biomarker
characteristics together with maturity considerations, mid-Cretaceous coaly
sediments are the most likely sources of the condensate and oil shows in
Kawau-1A well (Great South Basin), oil shows in deep Cretaceous strata in
Clipper-1 and Galleon-1 wells (Canterbury Basin), and the stains in beach sands
in northeastern Stewart Island. An oil stain in the upper Cretaceous in
Galleon-1 well is consistent with a Late Cretaceous coal source. Although some
marine strata have petroleum potential, particularly the Tartan Member
(equivalent of the latest Paleocene Waipawa Black Shale), they are often
immature, and oils generated from such sources have yet to be discovered.
Keywords Great South Basin; Canterbury Basin; Cretaceous;
coals; Waipawa Black Shale; petroleum source rocks; Rock-Eval; carbon isotopes;
biomarkers
New Zealand Journal of Geology and Geophysics, 1997, Vol. 40: 405-423
0028-8306/97/4004-0405 $7.00/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (1839K); (scanned from paper original: notes about this process)
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