b'AEGC 2023Short abstractswas implemented by warming up the lithology interpretationaquifers and overlying Cenozoic aquifers to underpin more model on the gravity and magnetic surveys all around Australia.robust basin water balance estimates for the GAB.Validation experiments revealed substantial performance improvements using SSL over the non-SSL model and is a huge advancement for applying the data-hungry deep learningOrganic depositional facies control on hydrocarbon models to the geoscience domain, where data points are scarceoccurrence in the Middle Triassic of the Roebuck and costly to acquire. Basin, WA.The trained deep learning models when applied to the SERIndia Sadd 1 Greg Smith2, Jon Minken1, Xiao Sun2 and projects showed great promise as a valuable decision makingTiffanyHanich2tool for exploration under cover. The predictions of the six lithology groups align with the expected geophysical response1 Santos Ltd of each group, and the ability to see the probability and2 Curtin University uncertainty of each interpreted lithology allows explorers to beThe facies control on organic matter compositions in the Middle wary of uncertain areas that may need additional geophysicalTriassic Caley Member, Bedout Sub-basin has been identified surveying to increase the confidence of the region. and related to oil and gas-condensate discoveries in the Dorado-Phoenix area. The new model provides an enhanced guide to prediction of hydrocarbon occurrence and liquids/gas Development of a new basin-wide 3D hydrogeologicalphase which is so elusive in current models. The organic facies model of the Great Artesian Basin for groundwatercharacterisation included non-destructive fingerprinting via assessment IonTof Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) scanning electron microscopy, coupled with incident light Nadege Rollet1, John Vizy1, Catherine Norton2, Careyfluorescent microscopy, traditional organic geochemistry and Hannaford3, Andrew McPherson1, Neil Symington, Tim Evans1,palynological data from adjacent samples.Tim Ransley1 and Donna Cathro1The source rocks occur in upper-lower delta coastal plain 1 Geoscience Australiaenvironments, including swamps adjacent to distributary 2 Catherine Jane Nortonchannels, marshes, interdistributary bays, back-barrier 3 MGPaleo lagoons and offshore shales. Each sub-environment has a distinct organic lithofacies including: vitrain and clarain coals, Geoscience Australias regional assessments and basin inventoriescoaly mudstones, carbonaceous mudstones, mudstones, are mapping Australias groundwater systems to improveand mudstones interbedded with sandstones. The organic knowledge of the nations groundwater potential under thefacies are readily distinguished based on their characteristic Exploring for the Future (EFTF) programme and beyond. Applyingmaceral assemblages: proportions of vitrinite, liptinite and integrated basin analysis workflows for groundwater applicationsinertinite maceral groups, the most significant macerals (eg the advances our understanding of hydrostratigraphic units, tieddiagnostic cutinites and algae including the freshwater algae to a nationally consistent chronostratigraphic framework. HereBotryococcus sp.) and their specific mass-spectrograms. The we focus on the Great Artesian Basin (GAB) where groundwaterresults were compared with those for the Early Triassic Kockatea is vital for pastoral, agricultural and extractive industries, townShale in the Perth Basin where the organic depositional facies water supplies, as well as supporting indigenous cultural valuesare significantly different.and sustaining a range of groundwater dependent ecosystems such as springs and vegetation communities. The organic maceral assemblages contained unusually high amounts of hydrogen-rich liptinite macerals (mostly sporinite, We build on the refined chronostratigraphic framework forcutinite and alginite), averaging 19% across the carbonaceous the GAB completed recently by Geoscience Australia. Thismudstone, coaly mudstone and coal organic facies, and up revised framework fills data and knowledge gaps in theto 54% in the cannel coals. The high liptinite content of Caley previous compilation and helps standardise existing andMember source rocks, (particularly the perhydrous cannel newly interpreted biostratigraphic data, well formation picks,coals), was confirmed by the ToF-SIMS results, which makes 2D seismic and airborne electromagnetic data across thethem excellent potential source rocks for liquid hydrocarbon GAB. We extend the geological framework to key transectsgeneration rather than gas. The identified relationships across NSW, SA, NT and QLD borders to refine nomenclaturebetween the maceral assemblages, organic facies, organic correlation between the Surat, Eromanga and Carpentariageochemistry and depositional environments makes them basins. This improves chronostratigraphic understanding in theextremely useful and cost-effective predictors of hydrocarbon western, northern Eromanga, Southern Surat and Carpentariaphase for future exploration in the Bedout Sub-basin and basins, and better resolve the overlying Cenozoic Lake Eyreelsewhere.Basin stratigraphy and potential connectivity. The new data and information fill data gaps, refining the previous 3D hydrogeological model of the entire GAB. A brief analysis of MobileMT data.The new 3D geological and hydrostratigraphic modelDaniel Sattel 1 and Ken Witherly2provides a framework to integrate additional hydrogeological1 EM Solutions and rock property data. It assists in refining hydraulic2 Condor Consultingrelationships between aquifers within the GAB and provides a basis for developing more robust hydrogeological systemThe MobileMT system measures natural-field EM data, conceptualisations. This represents a step towards the futureacquiring three-component airborne magnetic-field data while goal of quantifying hydraulic linkages with underlying basinsmonitoring the horizontal electric field at a base station. Data FEBRUARY 2023 PREVIEW 136'