Bureau of Resources and Energy Economics

Northern Caswell Sub-basin

View full size

Release Areas – AC14-2, AC14-3 and AC14-4

Work program bids close 2 October 2014


  • Adjacent to the Skua, Swift/Swallow and Montara oil developments
  • Proximal to the Ichthys, Prelude/Concerto and Crux gas developments
  • Shallow to deep water depths, 50–300 m
  • Thick Jurassic–Lower Cretaceous mature source rocks
  • Tilted Permo-Triassic and Jurassic fault blocks, and fluvio-deltaic to marine fan sands with Cretaceous seal
  • Special Notices apply, refer to Guidance Notes

Release Areas AC14-2, AC14-3 and AC14-4 are located in the southern Vulcan and northeastern Caswell sub-basins, and the Ashmore Platform, some 230 to 280 km from the northeast coast of Western Australia. Release Area AC14-2 is located in the northeastern part of the Caswell Sub-basin and extends into the southern part of the Vulcan Sub-basin. Release Area AC14-3 is located in the northern Caswell Sub-basin and extends onto the Ashmore Platform, while AC14 4 is located in the northern Caswell Sub-basin. All Release Areas are within the Territory of Ashmore and Cartier Islands.

A diverse range of undrilled structures may be prospective in the Release Areas. The dominant fault style in the region are tilted horst blocks where the dominant reservoirs are the Upper Triassic Nome Formation, the Jurassic Plover and Montara formations, the Upper Jurassic–Lower Cretaceous Vulcan and Echuca Shoals formations and, in some locations, the Upper Cretaceous Puffin Formation. In the southern Vulcan Sub-basin, the Montara field is producing hydrocarbons via a Floating Production Storage and Offloading (FPSO) facility, while the Skua and Swift/Swallow oil accumulations are currently in the development phase. In the northern Browse Basin, the Ichthys FPSO Project, and the Prelude and Concerto gas accumulations are under development, and production is being planned for the Crux gas and liquids project.

Related documents
Document Title PDF Other Format
Release Area Map – Northern Caswell Sub-basin PDF JPG
Geology – Northern Caswell Sub-basin PDF DOC
Data Listing – Northern Caswell Sub-basin   XLS
Block Listing and Block Diagram – Northern Caswell Sub-basin PDF DOC
Regional Geology – Browse Basin PDF DOC
Bidding for an exploration permit   DOC
2014 Special Notices   DOC

Note: Due to the complexity of these figures no alternative descriptions have been provided.
Please email Geoscience Australia at feedback@ga.gov.au for alternate descriptions.