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PESA WA : Evening talk – Sedimentology of the Gascoyne river. An analogy for the Mungaroo.

Thursday, 22 April, 2021 @ 6:00 pm - 8:15 pm (Australia/Perth time)

Free – $30.00

Guest Speaker(s): Simon Lang and Rob Seggie

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 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.

Robert Seggie is a geologist with over 40 years petroleum industry experience in technical and management roles. He worked at Woodside Energy for 23 years as well as at Santos, Oil Company of Australia, BHP, Geoscience Australia and consulting in exploration, development, production and research. Robert has focussed on the integration of high-resolution core-based sedimentology and sequence stratigraphy to identify commercial opportunities. His expertise also includes structural analysis, hydrodynamics, field appraisal and field development planning plus unconventionals. Over the last 20 years he has also facilitated technical workshops for improving decisions for any part of an asset lifecycle.  Robert is a member of PESA and AAPG having held various executive positions. He has authored many publications, presented conference talks and industry courses. He is semi-retired, pursuing geological research with some consulting.

Hosted with thanks to our sponsors:


The Gascoyne Delta, Western Australia – a wave-dominated, tide-influenced, ephemeral flood-prone fluvial system along a dryland coast; a useful partial-analogue for facies juxtaposition in ancient deltaic reservoirs of the North West Shelf.


Simon C. Lang1 & Robert Seggie2

1 Centre for Energy Geoscience, School of Earth Science, University of Western Australia, Perth, Australia.

  1. Robert Seggie, SeggieGeoscience, Nedlands, 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 long-term project to study the influence of increasing tidal range and wave power on the facies distribution of the arid to semi-arid coast of Western Australia, especially the role of distributary channel avulsion and how they build larger distributary fluvial systems and the associated spread of subaqueous distributary mouth bars and in some cases subaerial or inter-tidal terminal splays.

This presentation will focus on the Gascoyne delta (prior to the planned PESA field trip). It will summarise the main patterns of Quaternary sedimentary facies and depositional processes, based on satellite image-derived bathymetry and recent major flooding, LIDAR derived digital elevation models, ground penetrating radar, auger holes and river-bank outcrops.

Ideas will be presented on how the Gascoyne delta 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). The Gascoyne system has already been useful for understanding aspects of the Late Triassic Mungaroo and Early Jurassic Plover reservoirs for exploration, development & production on the North West Shelf of Australia. It can be deployed (with caveats) to many other fluvial-deltaic reservoir systems. 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 climate-change impact.



Thursday 22nd April March 6pm (for talk start at 6.45pm)


PESA Members:                                $15.00 (Members must Log on to the PESA website to see the member prices)

Non-members:                                 $30.00

PESA Students Members:             Free (registration is essential)

Bookings close 12 noon  for venue and catering purposes. 

Catering supported by Business Events Perth



Thursday, 22 April, 2021
6:00 pm - 8:15 pm
(Australia/Perth time)
Free – $30.00
Event Categories:
  • Venue

    Pan Pacific Perth
    207 Adelaide Terrace,
    Perth, wa 6000 Australia
    + Google Map
    (08) 9224 7777

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