Authors / CoAuthors
Carroll, A.G. | Jorgensen, D.C. | Siwabessy, P.J.W. | Jones, J. E. A | Sexton, M.J.
Abstract
Geoscience Australia is currently focused on delivering pre-competitive data to support the regional assessment of CO2 storage prospectivity in the Petrel Sub-basin, as part of the Australian Government's National Low Emission Coal Initiative. In this context, Geoscience Australia, in collaboration with the Australian Institute of Marine Science (AIMS), completed a marine survey in two targeted areas of the Petrel Sub-basin in May 2012. Data acquired onboard the AIMS research vessel, Solander included 652.3 km2 of high resolution multibeam sonar bathymetry and 655 line-kilometres of multi-channel sub-bottom profiles. Sampling at pre-determined stations included surface sediment grabs, vibrocores, towed underwater video, conductivity-temperature-depth profiles and ocean moorings. Multibeam sonar mapping revealed that Area 1 is characterised by palaeo-channels, plains, low-relief ridges and pockmark fields, whereas Area 2 is characterised by three steep- to vertically-sided flat-topped banks, which stand approximately 30-40 m above the surrounding seabed. Analysis of sediment samples indicate that the plains are comprised of fine- to medium-grained sands and muds, whereas palaeo-channels comprise coarse- to very coarse-grained sands. Habitats include soft barren sediments, bioturbated soft sediments and mixed patches of octocorals and sponges, distributed over shallow water depth ranges (82 - 96 m in Area 1; 45 - 52 m in Area 2). This information will be utilised to assess the biogeophysical setting (including habitat characterisation and the identification of unique, rare and/or potentially vulnerable habitats and communities) and seabed stability of the Petrel Sub-basin for potential CO2 storage.
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nonGeographicDataset
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75454
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- External Publication
- ( Theme )
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2013-01-01T00:00:00
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