b'AEGC 2023Short abstractsNew insights into Australian NW Shelf Upper Triassicsource, transportation and concentration of the lithium-rich Mungaroo Formation depositional systems based onbrines involves a complex mineral system that is dependent the deep exploration well Ironbark-1 and a regionallyupon climate, weathering, basin closure, surface drainage, merged 3D seismic data set. hydrothermal and groundwater systems, lithium-bearing rock distribution and geological structural control. A suite of satellite Dan Bishop and Vincent Dykmans platforms, geological datasets, Machine Learning algorithms and automated workflows has enabled the delineation and BP Developments Australia Pty Ltd targeting of potential lithium-rich salars and palaeosalars buried The Ironbark-1 exploration well was drilled by bp and pluggedbeneath Recent sediments and volcanics.and abandoned as a dry hole on the Australian NW Shelf inThe genesis of the lithium-rich brines is related to the leaching January 2021 after drilling to 5592 mTVDSS, providing anand transportation by rainfall, snowmelt, groundwaters and important new opportunity to gather data and understandhydrothermal fluids of mobile lithium from a source rock. This the depositional and petroleum systems of the deep Upperis predominantly a volcanic pyroclastic (ignimbrite) deposit, Triassic Mungaroo Formation. Post-well correlation of thebut may also be other lithium-rich rocks, such as pegmatites, well data and results to a regionally merged 3D seismic dataandesites and dacites. The transported lithium must be set has enabled extrapolation of the well findings into theconcentrated in an internal closed (endorheic) basin. Integrating broader area. Generation of 3D well-calibrated derivativedetailed satellite derived morphometrics maps with the seismic attribute volumes such as Extended Elastic Impedanceunderlying geology identifies the inlet points of the drainage (EEI) and Amplitude Versus Offset (AVO) classified volumesin relation to the ignimbrite distribution and the outlet points has enabled detailed mapping of the depositional systemswithin a salar or potential palaeosalar.at multiple Triassic levels and provided semi-quantitative estimates of the variability in reservoir and seal presence andIn addition, over 200 multispectral ASTER satellite images were quality. Fluvial channel systems within the Carnian Lowerprocessed to outline areas of hydrothermal alteration that are Mungaroo Formation are more poorly developed within therelated to subsurface hydrothermal fluid flow and that may be Ironbark-1 area than anticipated pre-drill and compared withassociated with the mobilisation of lithium. A detailed structural their occurrence inboard to the east. Development was poorermap highlights areas of fluid localisation and transportation in terms of channel system breadth, thickness, and reservoiralong faults.quality. Individual, more isolated fluvial channels within theCombining the data sets in a CGG developed Machine Learning Norian Middle Mungaroo Formation were more as anticipated,algorithm has enabled a heat map to be derived, which being narrow, low sinuosity, but reasonably thick channeldelineates areas of lithium-rich brine potential. This has been bodies with good reservoir quality. These younger channels mayproduced for the entire Lithium Triangle and shows potential for readily be mapped sub-regionally using the 3D seismic data andnew areas of exploration interest.derivative attributes and may act as both conduits and traps for hydrocarbons. These new seismic and well observations help explain the effectiveness of the petroleum system as well as theNSWs largest geophysical acquisition campaign.occurrence and nature of hydrocarbon indicators in the well.Astrid CarltonLand DAS streamer for rapid seismic acquisition Geological Survey of New South WalesAndrej Bona, Roman Pevzner and Konstantin Tertyshnikov The Geological Survey of New South Wales (GSNSW) is in the midst of a geophysical acquisition campaign, totalling $4.4 Curtin University M during 2022 and 2023. Over one sixth of the state will be Land seismic streamers have been used for shallow seismiccovered by new geophysical data, all of which will be publicly investigation for years. Advances in distributed acousticavailable through MinView by the end of 2023. The GSNSW sensing have allowed us to use a custom build system for usingwill acquire airborne electromagnetic, airborne magnetic optical cables as the sensor used for land seismic streamer.and radiometric, gravity and deep-reflection seismic data. The main benefits of using the optical cable as the sensor inGeoscience Australia will collaborate with the GSNSW to these application include the much longer length and ease ofacquire most of these surveys. This paper will discuss survey operation compared to standard geophone streamers. The dataspecifications, their purpose and how to access their data.acquired from the system can be used not only for the shallow investigations based on refraction and surface wave analysis,Increasing the prospectivity of northern Australia; but also for deeper reflection studies. We present a case study ofimpacts from the recent Exploring for the Future the streamer acquisition, in which we discuss the benefits andseismic acquisition and regional geology studies in the drawbacks of the system.South Nicholson region, Northern Territory.De-risking salar and palaeosalar lithium-brine richLidena Carr, Chris Southby, Chris Carson, Emma Grosjean, targets in the lithium triangle using satellite imagery. Adam Bailey, Tehani Palu, Jade Anderson and Paul HensonMark Broadley, Alfie Baines, Olivia Rhind and Jorge Gines Geoscience AustraliaCGG Satellite Mapping Exploring for the Future (EFTF) is an ongoing multiyear initiative of the Australian Government, conducted by Geoscience The salars of the Lithium Triangle in South America containAustralia, in partnership with state and Northern Territory approximately 55% of the worlds lithium resources. Thegovernment agencies and other partner research institutes. FEBRUARY 2023 PREVIEW 86'