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

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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Date (Creation)
2019-03-15T02:00:00
Date (Publication)
2019-09-13T05:05:51
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/127549

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Rollet, N.

 MEG Internal Contact
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Grosjean, E.
Author

Edwards, D.
Author

Kempton, R.

 External Contact
Author

Nguyen, D.
Author

Abbott, S.
Author

Orlov, C.
Author

Bernardel, G.
Author

Nicholson, C.
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AEGC 2019 Extended Abstract

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theme.ANZRC Fields of Research.rdf

  • EARTH SCIENCES

Keywords

  • Central North West Shelf

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  • Triassic

Keywords

  • source rocks

Keywords

  • palaeogeography

Keywords

  • petroleum systems

theme.ANZRC Fields of Research.rdf

  • EARTH SCIENCES

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  • Published_External

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Developed using G-NAF PSMA Australia Limited licenced by the Commonwealth of Australia under the Open Geo-coded National Address File (G-NAF) End User Licence Agreement (EULA) https://data.gov.au/dataset/geocoded-national-address-file-g-naf/resource/09f74802-08b1-4214-a6ea-3591b2753d30

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2018-11-01T00:00:00
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English
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Abstract submission to Australasian Exploration Geoscience Conference 2019

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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fc0a0ad4-1cc8-4ba6-bc45-33a3a888d815

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2018-05-04T03:37:56
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2018-05-04T03:38:12

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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Triassic palaeogeography petroleum systems source rocks
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES EARTH SCIENCES

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