Geoscience Visual Presentation G12: Petroleum systems analysis of the onshore Otway Basin, South Australia
Casey Edwards A *A
Graduating with a BSc in Geology (hons) from UNSW, Casey Edwards has over 20 years’ industry experience, including several years as a senior and principal geoscientist with ECL Australia and RPS Group, where she specialised in petroleum systems analysis for conventional and unconventional systems. In 2014 Casey started Source Geoscience Pty Ltd; projects to date have included PSA work in most Australian basins and multiple international basins, for private companies and government organisations. She is a member of PESA. |
Abstract
Geoscience Visual Presentation G12
An updated Petroleum Systems Model was built for the South Australian onshore Otway Basin, incorporating new seismic interpretation, seismic stratigraphy, core interpretations and a recent chemostratigraphy study. The Otway Basin is a divergent passive continental margin, with the Penola Trough the most significant hydrocarbon province discovered to date. Revision of the existing geochemistry database and seismic stratigraphy along with source rock model indicates potential good quality, liquids prone lacustrine source rocks are present in the Jurassic Casterton Formation (S0-P5) and the Early Cretaceous Basal Shale (McEachern Sand equivalent)/Lower Sawpit Shale (S1-P1/S1-P2). Gas prone source rocks are modelled in the Valanginian Upper Sawpit Shale (S1-P4/S1-P5) and Hauterivian Laira Formation (S1-P6–S1-P10). Modelling suggests liquid hydrocarbons were expelled from the Lower Sawpit Shale between 126 and 70 Ma, with the majority sourced from the Penola and Robe Troughs. Gas/condensate expulsion also took place up to 30 Ma from the Upper and Lower Sawpit Shale in the Penola and Robe Troughs. Gas is modelled to have been expelled from the Laira Formation in the Tantanoola Trough, between 100 Ma and present day.
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Keywords: basin modelling, gas, gas expulsion, geochemistry, lacustrine, Otway, petroleum systems modelling, oil expulsion.
Graduating with a BSc in Geology (hons) from UNSW, Casey Edwards has over 20 years’ industry experience, including several years as a senior and principal geoscientist with ECL Australia and RPS Group, where she specialised in petroleum systems analysis for conventional and unconventional systems. In 2014 Casey started Source Geoscience Pty Ltd; projects to date have included PSA work in most Australian basins and multiple international basins, for private companies and government organisations. She is a member of PESA. |
