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PESA SA/NT September Technical Luncheon – Thursday, September 30th: Dryland Deltas of Western Australia – from wave- to tide-dominated, ephemeral flood-prone fluvial depositional systems

Monday, 11 October, 2021 @ 12:00 pm - 1:30 pm (Australia/Adelaide time)

Free – $80.00

Guest Speaker(s): Simon Lang

Professor Simon Lang is a sedimentologist/stratigrapher with global experience including regional geological mapping, sedimentology/stratigraphy research, and petroleum exploration & development. He worked at the Geological Survey of Queensland (1979-92), then Lecturer at Queensland University of Technology and Associate Professor at the NCPGG & Australian School of Petroleum, University of Adelaide (1992-2005). He was co-ordinator of the Stratigraphy & Reservoir Analysis team for Woodside (2005-13), then Senior Stratigrapher with the Seismic Geomorphology & Clastic Stratigraphy teams for Chevron Energy Technology Company (Houston), and Geologic Services Manager & Stratigraphy Advisor (Perth) for Chevron Australia (2013-18). He joined University of Western Australia as Professor of Petroleum Geoscience at the School of Earth Sciences, and Director of the Centre for Energy Geoscience, leading industry-funded research consortia on seismic stratigraphy and reservoir analogues. He has published extensively, supervised numerous graduate students, led industry-oriented training courses and research consortia, and run numerous field courses & core workshops. He was PESA Distinguished Lecturer (2010), and a member of PESA, AAPG and SEPM.

Dryland Deltas of Western Australia – from wave- to tide-dominated, ephemeral flood-prone fluvial depositional systems; useful partial-analogues for ancient deltaic reservoirs
Presented by Simon Lang
Centre for Energy Geoscience, School of Earth Science, University of Western Australia, Perth, Australia

Marine deltas are shaped by the dominance of fluvial outflow (F) relative to the influence of waves (W) and tides (T) that in turn control facies distribution. However, in dryland fluvio-deltaic systems, the rivers typically flow only following ephemeral or seasonal flooding events (i.e., a few weeks of the year either following cyclones or winter storms), but replenish sands and mud to the delta front.
The Gascoyne, Ashburton, and de Grey river deltas are the subject of a reservoir analogue study examining the influence of increasing tidal range and wave power on the facies distribution of the arid to semi-arid coast of Western Australia,. Focus is on the role of channel avulsions, and the architecture of larger distributary fluvial systems and floodplains, their associated subaqueous distributary mouth bars and oolitic tidal-bars, and subaerial or inter-tidal terminal splays.
The main Quaternary sedimentary facies and depositional processes will be summarised (main focus on the Gascoyne delta), based on satellite image- and drone-derived bathymetry, recent flooding, LIDAR digital elevation models, ground penetrating radar, auger holes and river-bank outcrops.
Ideas will be presented on how these deltas can be used as a training dataset for teaching the next generation of geoscientists on how to generate conceptual geological models for reservoir/aquifer & seal modelling, the potential ranges of uncertainty, and compensating for the wide array of local differences (in this case specifically dryland processes). These delta systems have already been useful for understanding aspects of the Early Triassic Caley Formation at Dorado Field, many aspects of the outboard Late Triassic Mungaroo, and Early Jurassic Plover reservoirs for exploration, development & production on the North West Shelf of Australia. Key concepts can be deployed (with caveats) to many other fluvial-deltaic reservoir systems, including training images for guiding AI based modelling approaches. It can also be useful for modelling SEDEX copper mineralization plays in redbed delta settings. Furthermore, this study improves understanding of geological-scale coastal changes during the Icehouse conditions of the Quaternary, and offers lessons for predicting the impact climate-change.


Event Details:

Technical Luncheon, Ayers House at 12:00pm, for a 12:30pm start. Includes a 2-course lunch and drinks.

Bookings close Monday , 27th September at 1pm. Any late bookings will incur an additional $10 fee. Strictly no walk-ins


Monday, 11 October, 2021
12:00 pm - 1:30 pm
(Australia/Adelaide time)
Free – $80.00
Event Categories:
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    Ayers House – Henry’s Bar
    288 North Terrace
    Adelaide, SA 5000 Australia
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