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OTWAY BASIN, SOUTH AUSTRALIA

The Otway Basin is a large, broadly northwest-trending sedimentary basin encompassing onshore and offshore parts of South Australia and Victoria, and extending into Tasmanian waters. Water depths are shallow, typically less than 200 m depth. The Otway Basin has extensive seismic coverage, and good distribution of petroleum wells. Potential structural traps associated with tilted fault blocks and structural/stratigraphic traps in draping strata over deeper structures provide the potential for GHG storage.

Reservoir:    Early Cretaceous Pretty Hill Formation; Waarre Formation and the Timboon Sandstone.
Seal:             Intraformational shales including the Pember Mudstone, Flaxman Formation, as well as regional seals including the Belfast Mudstone, the Laira Formation and the Eumeralla Formation.
Trap:             Multiple structural and sedimentary traps and migration dissolution/residual trapping.

Refer to Krassay et al., 2004 for stratigraphic information.

OTWY-01, Otway Basin

OTWY-01 is located along the northwestern edge of the Otway Basin, about 10 to 85 km off the South Australian coast, and west of Robe (Figure 1). Release area OTWY-01 covers an area of approximately 4025 square kilometres and 65 graticular blocks or parts thereof (Figure 2).

Overlapping Petroleum Exploration Titles

Figure 1. Location map of offshore Greenhouse Gas Storage release areas for Assessment OTWY-01, Otway Basin.