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2025 PESA WEBINAR SERIES: Where Comes the Gas From, Where Does it Go? Southern Denison Trough CO2 Storage Possibilities from a Geological Perspective
Tuesday, 13 May @ 11:00 am - 12:00 pm (Australia/Perth time)
Free – $10.00
Kindly supported by Rock Flow dynamics 
This live webinar will take place at:
11am – Perth
12.30pm – Darwin, Adelaide
1pm – Brisbane, Canberra, Hobart, Melbourne, Sydney
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Tickets are free for members (please log in to see this) and $10 for non members.
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Where Comes the Gas From, Where Does it Go? Southern Denison Trough CO2 Storage Possibilities from a Geological Perspective
Presented by Alison Troup (University of Queensland)
Abstract
The southern Denison Trough contains several depleted conventional gas fields, mostly reservoired in the Aldebaran Sandstone with secondary reservoirs in sandstones of the upper Reids Dome beds. These gas fields are naturally high in CO2 and may present a good opportunity from a geological perspective for CO2 storage. In support of this an updated interpretation of the depositional environment at Merivale, Westgrove, Yellowbank and Punchbowl Gully has been developed to examine changes in depositional environment along the Aldebaran Sandstone paleocoastline. Comparison of the production history of Merivale to the variability in the depositional environment shows that there is strong contribution from the depositional environment to production behaviour.
Sandstones and coal seams in the upper Reids Dome beds may present a secondary target to depleted gas field storage in the southern Denison Trough. Gas distribution in the Reids Dome beds coals shows that the Hutton-Wallumbillla Fault may be a migration pathway for magmatic CO2 into the unit. High CO2 concentrations and saturations within these coals demonstrate a natural analogue for storage within this system. The stratigraphic placement of these coal seams has been improved through the use of stable carbon isotope analysis.