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LIVE WEBINAR – An Overview of Geoscience Australia’s Regional Mapping over the Central North West Shelf: Stratigraphy, Structure & Palaeogeography

Thursday, 28 May, 2020 @ 11:00 am - 12:00 pm (Australia/Perth time)

Free – $10.00

To view the event video and associated handouts (if any), please either log in to your active PESA membership account or enter the event password you received when you registered for this event.

Guest Speaker(s): Steve Abbott

Steve Abbott earned his qualifications in sedimentary geology from Flinders (Hons, 1987) and James Cook (PhD, 1994) universities. He joined the Energy Systems Branch at Geoscience Australia in 2013, where he works on regional tectonostratigraphic studies of the North West Shelf. Steve’s past roles include mineral exploration (mainly for sedimentary uranium in central Australia), teaching and research (Southern Cross University, James Cook University, and the University of Tasmania), and regional mapping with the Northern Territory Geological Survey. Steve is President of PESA-ACT.

Kindly supported by Rock Flow dynamics


This live webinar will take place at:

11am         – Perth
12.30pm  – Adelaide and Darwin
1pm          – Brisbane, Canberra, Hobart, Melbourne, Sydney

Use the calendar link on this page to add this event in to your own calendar at the correct local time for your location.

Tickets are free for members (please log in to see this) and $10 for non members.

Please buy your tickets and immediately follow the link in the ticket e-mail (not the calendar invite or this webpage, which is just generic and not event specific) to set up your registration with the webinar software well in advance of the time of the talk. Once registered with the webinar software you will receive a reminder e-mail 1 hr beforehand.




An Overview of Geoscience Australia’s Regional Mapping over the Central North West Shelf: Stratigraphy, Structure & Palaeogeography

Presented by Steve Abbott


A regional mapping program conducted by Geoscience Australia has addressed aspects of exploration uncertainty within the Triassic succession of the Roebuck Basin and parts of the adjacent sub-basins (central North West Shelf). N-trending and NE-trending fault sets dominate the Triassic section. Vertical separation of faults between the upper Triassic and lower Triassic successions results in different fault fabrics mapped on the top and base Triassic surfaces. Major faults locally penetrate through the Mesozoic section and into the Paleozoic basement, forming features with significant displacement such as the Thouin Graben, Whitetail Graben, Naranco High, and half graben in the Barcoo Sub-basin. Isochore maps reveal two Triassic depocentres separated by an area of thin Triassic extending from the inboard Bedout Sub-basin out to the western Rowley Sub-basin and NE Exmouth Plateau. This new mapping shows that there is a poor correlation between Triassic depocentres and existing basin boundaries.

A new Triassic stratigraphic framework for the region is based on five regional seismic surfaces that define four stratigraphic packages. Fluvio-deltaic, carbonate-siliciclastic plaform, marine mudstone, and volcanic gross depositional facies are distributed among these stratigraphic packages, and constrain the palaeogeographic and structural evolution of the study area. The lower part of the Triassic succession in the Bedout Sub-basin has been identified as Australia’s new offshore oil and gas province. The results from this study help to place recent Bedout Sub-basin discoveries within a regional geological context and will inform future assessments of the hydrocarbon prospectivity across the central North West Shelf.




Thursday, 28 May, 2020
11:00 am - 12:00 pm
(Australia/Perth time)
Free – $10.00
Event Categories:
  • Venue

    The internet Australia

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