Executive summary (Extract) The Otway Hot (and Warm) Sedimentary Aquifers and SEEBASE™ project, Phase 1, covers the deep aquifers, from Jurassic to Late Cretaceous, of the onshore and offshore Otway basin spanning the southern parts of the states of Victoria and South Australia.
The main objectives of the study were to produce:
- A SEEBASE™ model for the study area.
- An interpretation of basement terranes – composition, lithology and structure.
- A tectono-stratigraphic framework of the Otway basin deep aquifers based on seismic interpretation and wells data. The key stratigraphic units of interest are from bottom to top, the Casterton Formation (aquitard), the Pretty Hill Formation (aquifer), the Laira Formation (aquitard), the Katnook and Windermere sandstones (aquifer) and the Eumeralla Formation (aquitard).
- A set of schematic tectonic event response maps showing regional structural evolution of the basin.
- A description and interpretation of the timing and nature of basin fill phases with relation to facies.
- A compilation and assessment of the available thermal data for the entire basin, onshore and offshore. No interpretation has been provided in Phase 1.
A compilation and assessment of the available thermal data for the entire basin, onshore and offshore. No interpretation has been provided in Phase 1.
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- A detailed list of properties of 6 potential aquifers/reservoirs, with an extended characterization of the seismic facies and petrophysical description of 3 of the Lower Cretaceous deep aquifers, the McEachern Sandstone Member, Sawpit Sandstone Member and Pretty Hill Sandstone. These aquifers are mappable across both South Australian and Victorian sectors of the Otway Basin.
- A set of structurally controlled formation top maps and grids for the Pretty Hill Formation, Crayfish Eumeralla Group and Sherbrook Formation based on seismic horizons re-interpreted by FrOG Tech.
- Establishment of the link between the depocenters infilling structural control and most suitable facies localisation.
- A corrected temperature database and the base geological data and maps needed to perform heat flow modelling.