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.

Conference volume and CD are available through the Petroleum Exploration Society of Australia

22-3/J55-02/3-1/1

This map shows the area of the Portland Area Trawl Closure within the Commonwealth Trawl Sector (also known as the Commonwealth South East Trawl Fishery (SETF)) of the Southern and Eastern Scalefish and Shark Fishery. Modified from GeoCat 68493 (2008) as per the Southern and Eastern Scalefish and Shark Fishery (Closures) Direction No. 1 2009 - Schedule 23. Produced for the Australian Fisheries Management Authority. Not for public sale or distribution by GA.

22-1/I54-11/1 Contour interval: 10

No abstract available

No abstract available

The Bass Basin is a moderately explored Cretaceous to Cainozoic intracratonic rift basin on Australia?s southeastern margin. A basin-wide integration of seismic data, well logs, biostratigraphy and sequence stratigraphy has resulted in the identification of six basin phases and related megasequences/ supersequences. These sequences correlate to three periods of extension, a rift-transition phase, and two subsidence phases. The complex nature of facies relationships across the basin is attributed to the (mostly) terrestrial setting of the basin until the Middle Eocene, multiple phases of extension, strong compartmentalisation of the basin due to underlying basement fabric, and differential subsidence during extension and early subsidence phases. Evidence of the initial rift phase (Otway Megasequence) is only clearly observed in the Durroon Sub-basin and in the southwestern Cape Wickham Sub-basin. The second rift phase (Durroon Megasequence) is pervasive throughout the Bass Basin, although a full succession of this megasequence was only penetrated in the Durroon Sub-basin. The third-rift phase (Bass Megasequence) is also pervasive throughout the basin, but appears to have affected only particular depocentres such as the Pelican, Cormorant and Yolla troughs. Here, expanded syn-tectonic growth sections have been intersected. There is wide variation in facies type, environment and thickness of the Bass Megasequence due to differential rates of subsidence. Three component sequences have been recognised within the Bass Megasequence (Furneaux, Tilana and Narimba sequences), with each component sequence correlated to discrete periods of increased accommodation. The shift from rift-to-post-rift conditions (Aroo Megasequence) was signaled by waning subsidence rates and an increasing brackish influence. A wide variation in facies types, environments and thicknesses is also observed. The frequency and thickness of coals began to increase during the deposition of this megasequence, lasting from Early Eocene until the mid-Middle Eocene. A slowdown in subsidence rates allowed the aggradation of coaly facies (many geochemically characterised as ?hydrogen-rich?), indicating there was a balance between accommodation, sediment supply and peat production. The most important sequences for petroleum generation and trapping are the Bass and Aroo megasequences. Most of the coaly source rocks now typed to liquid hydrocarbon generation were deposited during the period of late Early Eocene to Middle Eocene rift-transition phase. The critical factor in sourcing accumulations from the coaly succession appears to be effective primary and secondary expulsion from the source rock and the volume of charge. Biostratigraphic studies have identified lacustrine cycles during the Late Cretaceous to Middle Eocene, with geological evidence indicating these lakes developed during times of increased accommodation. Lacustrine shales are likely to be more important as seal facies, rather than as potential source rocks. The Middle Eocene (Demons Bluff Sequence) and younger marine successions (Torquay Sequence) show low source potential and do not lie within the oil window. Optimal conditions for seal deposition occurred during lacustrine cycles in the Late Cretaceous to Early Eocene, and the mid-Eocene. Untested plays include reservoir/seal pairs associated with seven maximum flooding events in the western Bass Basin. The petroleum systems elements of the Durroon Sub-basin differ significantly from the Cape Wickham Sub-basin owing to the cessation of tectonically-driven subsidence in the eastern Bass Basin (Durroon Sub-basin) from the mid-Campanian onward.

This package comprises data sets which cover the BENDIGO 1:250 000 map sheet area (BENDIGO). This area has recently been covered by airborne geophysical surveys by the Australian Geological Survey Organisation and geologically mapped by the Geological Survey of Victoria and this data package intends to compliment these data.

This map shows the boundary of the security regulated port for the purpose of the Maritime Transport & Office Security Act 2003. 8 sheets (Colour) October 2009 Not for sale or public distribution Contact Manager LOSAMBA project, PMD