Authors / CoAuthors
Nicholas, W.A. | Nichol, S.L. | Howard, F.J.F.
Abstract
Abstract: The extent to which fluids may leak from sedimentary basins to the seabed is a critical issue for assessing the potential of a basin for carbon capture and storage. The Petrel Sub-basin, located beneath central and eastern Joseph Bonaparte Gulf in tropical northern Australia, is identified as potentially suitable for the geological storage of CO2 because of its geological characteristics and proximity to offshore gas and petroleum resources. In May 2012, a multidisciplinary marine survey was undertaken to collect data in two targeted areas of the Petrel Sub-basin to facilitate an assessment of CO2 storage potential. Multibeam bathymetry and backscatter mapping (650 km2 over 5,300 line km), combined with acoustic sub-bottom profiling (650 line km) and geomorphological and sediment characterisation of the seabed was undertaken above the CO2 supercritical seal boundary of the sub-basin. Features identified in the high resolution (2 m) bathymetry data include carbonate banks, ridges, pockmark fields and fields of low amplitude hummocks located directly adjacent to banks. Unit and composite pockmarks and clusters of pockmarks are present on plains and adjacent to, and on, carbonate ridges. It is postulated that there are three possible sources for fluids and fluidised gas involved in pockmark formation: deep fluids from the basin, post-Cretaceous intra-formational, layer-bound fluids, and shallow-sourced fluidised gas from the breakdown of organic matter following the Holocene marine transgression of Joseph Bonaparte Gulf.
Product Type
nonGeographicDataset
eCat Id
75584
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External Publication
- ( Theme )
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- bathymetry
- ( Theme )
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- continental shelf
- ( Theme )
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- geological storage of CO2
- ( Theme )
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- marine
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- AU-NT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Geomorphology and Regolith and Landscape Evolution
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- Published_Internal
Publication Date
2013-03-12T00:00:00
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asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
Unknown
Parent Information
Extents
[-12.91, -12.3, 128.765, 129.33]
Reference System
Spatial Resolution
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