New perspectives on the sequence stratigraphy of the Early-Middle Triassic of the Bedout Sub-basin
Roisin McGee A * , George Mills A and Simon Sturrock BA
B
Roisin McGee is the Geoscience Manager at Carnarvon Energy. She holds a BSc in Geophysics from Leeds University, an MSc in Petroleum Geoscience from Imperial College London and an MBA from the University of Western Australia. Roisin began her career at Gaffney Cline and Associates in 2009 before joining Statoil as a geophysicist in Bergen, Norway. In 2013, she relocated to Perth and joined Carnarvon Energy, where she played a key role in the Bedout Joint Venture, contributing to all exploration wells. She is a committee member of PESA WA. |
George Mills is a Senior Geoscientist at Carnarvon Energy. George graduated with a BSc (Hons) degree in Geology and Resource Economics from the University of Western Australia in 2014. In late 2014, George joined Carnarvon Energy as a Geoscientist as part of Carnarvon’s subsurface team. George’s time at Carnarvon has been spent primarily looking at E&P opportunities across the Australian North West Shelf, particularly within the Bedout Sub-basin. George is a member of PESA WA. |
Dr Simon Sturrock is a Director of Strat Trap Pty Ltd, a stratigraphic prediction consultancy specialising in the integration of seismic, well and outcrop data, using sequence stratigraphic principles, for prospect generation and detailed field appraisal projects. Simon holds a BSc in Geology from Exeter University and a PhD in Geology. Simon possesses extensive international exploration experience, including 11 years with BP and 30 years as an independent consultant. Simon is currently a member of the GESGB and PESA. |
Abstract
The Bedout Sub-basin, part of the Roebuck Basin on Western Australia’s North West Shelf, has drawn interest since hydrocarbon discoveries at Roc, Dorado and Pavo. Despite these successes, the region remains underexplored. This study applies sequence stratigraphic analysis, well data and 3D seismic data to characterise the basin’s depositional history and hydrocarbon potential. A Wheeler diagram illustrates chronostratigraphic relationships, identifying key sequence stratigraphic play systems. Findings reveal a shallowing-upward trend from the Early to Middle Triassic, a new play system in Late Permian carbonates and highlight that the Archer reservoir sands are a series of low-stand deposits. These insights refine the Bedout Sub-basin’s stratigraphic framework and inform future exploration efforts.
Keywords: Archer, Bedout, Dorado, Early Triassic, Middle Triassic, sequence boundary, sequence stratigraphy, systems tracts, wheeler diagram.
Roisin McGee is the Geoscience Manager at Carnarvon Energy. She holds a BSc in Geophysics from Leeds University, an MSc in Petroleum Geoscience from Imperial College London and an MBA from the University of Western Australia. Roisin began her career at Gaffney Cline and Associates in 2009 before joining Statoil as a geophysicist in Bergen, Norway. In 2013, she relocated to Perth and joined Carnarvon Energy, where she played a key role in the Bedout Joint Venture, contributing to all exploration wells. She is a committee member of PESA WA. |
George Mills is a Senior Geoscientist at Carnarvon Energy. George graduated with a BSc (Hons) degree in Geology and Resource Economics from the University of Western Australia in 2014. In late 2014, George joined Carnarvon Energy as a Geoscientist as part of Carnarvon’s subsurface team. George’s time at Carnarvon has been spent primarily looking at E&P opportunities across the Australian North West Shelf, particularly within the Bedout Sub-basin. George is a member of PESA WA. |
Dr Simon Sturrock is a Director of Strat Trap Pty Ltd, a stratigraphic prediction consultancy specialising in the integration of seismic, well and outcrop data, using sequence stratigraphic principles, for prospect generation and detailed field appraisal projects. Simon holds a BSc in Geology from Exeter University and a PhD in Geology. Simon possesses extensive international exploration experience, including 11 years with BP and 30 years as an independent consultant. Simon is currently a member of the GESGB and PESA. |
