VGP Technical Report 65 - Revised stratigraphy of the Crayfish Subgroup, Otway Basin, Victoria.
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Product description:About the Victorian Gas Program: The Victorian Gas Program (VGP) is a comprehensive science-led program, incorporating geoscientific and environmental research to assess the risks, benefits and impacts of potential onshore conventional gas exploration and production. The program is also investigating the potential for further discoveries of onshore conventional and offshore gas in the Otway and Gippsland geological basins and assessing the feasibility of additional onshore underground gas storage in depleted reservoirs around the Port Campbell area. The VGP includes an extensive, proactive and phased community and stakeholder engagement program, through which the results of the scientific studies are being communicated. Executive summary: As part of the Victorian Gas Program (VGP), the Geological Survey of Victoria (GSV) is studying petroleum systems components (reservoir, seal and source), to assess the hydrocarbon prospectivity of the Victorian Otway Basin and estimate the potential for further onshore and offshore discoveries within Victoria’s jurisdiction. New analysis of the geology of the Otway Basin has resulted in the revision of the stratigraphy of the Crayfish Subgroup in Victoria. The Crayfish Subgroup has been revised to include the latest Berriasian to Valanginian Sawpit Formation (new). The Sawpit Formation is the lowermost formation of the Crayfish Subgroup and conformably underlies the Pretty Hill Formation. The Pretty Hill Formation (revised) is now restricted to the sedimentary sequence between the Sawpit Formation and the Laira Formation. The rank of the McEachern Sandstone is here changed to member status within the Sawpit Formation. Based on published informal schemes (Boult & Hibburt, 2002; Camac & Boult, 2008; Briguglio et al., 2015), this new scheme formalises and preserves well established naming with the opportunity to designate new members in the future; in particular, within the Sawpit Formation. Legacy GSV datasets were integrated with new VGP analysis (e.g. chemostratigraphy data (Forbes et al., 2020), biostratigraphy (Charles et al., 2019), lithology, wireline log and seismic interpretations (Romine et al., 2020)) to review the current lithostratigraphy and associated nomenclature. The results of the analysis are detailed in this study, supporting this revision of the stratigraphy of the Crayfish Subgroup in Victoria and the resultant new stratigraphic framework. Bibliographic reference: Eid, R., Goldie Divko, L.M., Herley, S.S. & Guzel, M., 2021. Revised stratigraphy of the Crayfish Subgroup, Otway Basin, Victoria. VGP Technical Report 65. Geological Survey of Victoria, Department of Jobs, Precincts and Regions, Melbourne, Victoria. Download: The downloadable version of this report is supplied in PDF format (14 MB). Related products:
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