Abstract
Abstract All the important known hydrocarbon reserves of New Zealand are contained in Upper Eocene sandstones of the Kapuni Formation. Despite its economic importance the Kapuni Formation has received little petrological study, This article presents information from ten samples from a 7⋅5 m cored interval in the Inglewood-1 well, Taranaki. The available sediments are very coarse to medium grained quartzose sandstones with grain supported texture, Dominance of unstrained monocrystalline quartz, limited amounts of microcline and orthoclase, lack of plagioclase, and low mafic content suggest an alkali granitic provenance. Deposition of the sediments as point bars in migrating channels is suggested by the general decrease in grain size upwards and by the sequence of sedimentary structures resembling those described from Recent point bars. Angularity of grains and presence of some fresh feldspar and micas indicate first cycle deposition. Important and widespread diagenetic effects include syntaxial quartz over...
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