Skip to Main Content
Book Chapter

Chapter 9 Taranaki Basin, New Zealand

By
Palmer Julie
Palmer Julie
Petrocorp Exploration Limited,Wellington, New Zealand
Search for other works by this author on:
Bulte Geoff
Bulte Geoff
Petrocorp Exploration Indonesia Limited,Jakarta, Indonesia
Search for other works by this author on:
Published:
January 01, 1991

ABSTRACT

The Taranaki basin is a Cretaceous and Tertiary sedimentary basin located along the western side of the North Island, New Zealand. Initiated during the Cretaceous, the Taranaki basin lies at the southem end of a rift that developed subparallel to the Tasman Sea rift, which now separates Australia and New Zealand.

Structure of the basin has been controlled by movement along the Taranaki and Cape Egmont fault zones. Subsidence commenced in the Cretaceous and continued until the Pliocene. The predominant tectonic regime in the Taranaki basin changed from one of extension to one of compression in the early Miocene. Late Tertiary tectonics formed three primary structural types: faulted anticlines, high-angle overthrust structures, and tilted fault blocks. Kapuni and Maui gas-condensate fields are faulted anticlines; the McKee (oil) and the Ahuroa and Tariki (gas-condensate) fields are overthrust structures.

Sandstones within the Eocene Kapuni Group and the Oligocene Otaraoa Formation are the only producing reservoirs. The gas- condensate and oil are sourced from nonmarine to paralic coals and carbonaceous shales of the Late Cretaceous-Eocene Pakawau and Kapuni groups. The overlying marine sequences are organically lean and have negligible source potential.

A large proportion of the sedimentary succession was deposited during the late Tertiary. Consequently, the geothermal gradient in the Taranaki basin is moderately low «3°C/100 m). Maturation studies show that only those source rocks buried between 4000 and 4950 m are in the present oil generation and gas expulsion window.

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Memoir

Active Margin Basins

Kevin T. Biddle
Kevin T. Biddle
Exxon Company, International Houston, Texas, U.S.A.
Search for other works by this author on:
American Association of Petroleum Geologists
ISBN electronic:
9781629811147
Publication date:
January 01, 1991

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal