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Triassic petroleum systems on the central North West Shelf – Learnings from the Greater Phoenix area seismic mapping and geochemical studies

Created 21/12/2025

Updated 21/12/2025

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The greater Phoenix area in the Bedout Sub-basin has experienced recent exploration success on Australia’s North West Shelf (NWS). Oil and gas discoveries in the Triassic reservoirs of the Keraudren Formation and Locker Shale have revived interest in mapping the distribution and lateral facies variation of the Triassic succession from the Bedout Sub-basin into the adjacent underexplored Beagle and Rowley sub-basins. This multi-disciplinary study integrating structural architecture, sequence stratigraphy, palaeogeography and geochemistry has mapped the spatial and temporal distributions of Triassic source rocks on the central NWS. The Lower‒Middle Triassic palaeogeography is dominated by a deltaic system building from the Bedout Sub-basin into the Beagle Sub-basin. The oil sourced and reservoired within the Lower‒Middle Triassic sequences at Phoenix South 1 is unique to the Bedout Sub-basin, compared to other oils along the NWS. Its mixed land-plant and algal biomarker signature is most likely sourced locally by fluvial-deltaic mudstones within the TR10‒TR14 or TR15 sequences and represents a new petroleum system on the NWS. A Middle Triassic marine incursion is recorded in the Bedout Sub-basin with the development of a carbonate platform while in the Rowley Sub-basin, volcanics have been penetrated at the top of the thick Lower‒Middle Triassic sediment package. The Late Triassic palaeogeographic map suggests a carbonate environment in the Rowley Sub-basin distinct to the clastic-dominated fluvial-deltaic environment in the Beagle Sub-basin. This information combined with results of well-based geochemical analyses highlights the potential for hydrocarbon generation within the Upper Triassic in these sub-basins.

This extended abstract was presented at the Australasian Exploration Geoscience Conference (AECG) 2019

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Field Value
Title Triassic petroleum systems on the central North West Shelf – Learnings from the Greater Phoenix area seismic mapping and geochemical studies
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/c16bc1bc-2f33-4916-b040-049a8f09b741
Contact Point
Australian Ocean Data Network
clientservices@ga.gov.au
Reference Period 04/05/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "Triassic petroleum systems on the central North West Shelf – Learnings from the Greater Phoenix area seismic mapping and geochemical studies". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/triassic-petroleum-systems-on-the-central-north-west-shelf-learnings-from-the-greater-phoenix-a1