Professional Opinion
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The Murray Canyons area of interest extends across a series of two major Mesozoic basins (Otway and Bight), remnants of a thin Permian basin (Troubridge), and broad areas of thin Cainozoic cover over continental crust (Encounter Bay Shelf) and oceanic crust (Australia-Antarctica Basin). It has been possible to classify and map a range of different levels of petroleum prospectivity in this area by using a risking scheme that assesses the likelihood of hydrocarbon generation and migration, sealed reservoirs, and valid traps. The level of knowledge and confidence in the risk assessment is also incorporated into the ranking of petroleum prospectivity. Using this approach, its is possible to identify areas that are likely to be explored for petroleum accumulations. These include one proven prospective area (Outer Crayfish), four indicated prospective areas (East Ceduna, East Duntroon, Inner Crayfish and Morum Sub-basin 1), and one area with inferred prospectivity (Morum Sub-basin 2). The Murray Canyons area of interest also includes eight areas which are considered a high risk for the presence of petroleum accumulations, and are thus less likely to be explored (Trumpet Shelf, Couedic, Recherche-Hunter, Otway Thin Outer Cretaceous, Murray Canyons, Troubridge 1, Troubridge 2, and Encounter Bay Shelf). Two non-prospective areas are present where hydrocarbons accumulations are considered to be absent, and are unlikely to be explored (Otway Volcanic Buildup and Abyssal Plain).
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The Nelson, Zeehan and Apollo regions are three of eleven Broad Areas of Interest identified as possible areas for the establishment of Marine Protected Areas by Environment Australia (with statutory and policy responsibility for MPAs), the National Oceans Office (with responsibility for regional marine plans) and other stakeholders. An assessment of the petroleum prospectivity of the Nelson, Zeehan and Apollo regions was undertaken by Geoscience Australia in order to identify areas with the potential to generate and host hydrocarbon accumulations. The assessment used a risk-based approach whereby factors that controlled the sourcing and trapping of hydrocarbons were assessed based on the likeihood of their presence or absence within a particular region. The level of knowledge and confidence in the risk assessment was also incorporated into the ranking of petroleum prospectivity. These factors were considered along with other geological risks to formulate a classification scheme. This scheme has been applied to Nelson 1B, Zeehan 1C and Apollo 1D BAOIs.
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Legacy product - no abstract available
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This project was commissioned by Dr Clinton B Foster (AGSO) to provide a palynological reconnaissance of selected samples from six Eucla Basin wells in south-western South Australia and south-eastern Western Australia.
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