Authors / CoAuthors
Johnston, S.W. | Petkovic, P.
Abstract
During 2009-2011 Geoscience Australia completed a petroleum prospectivity study of the offshore northern Perth Basin. Basement is deep and generally not resolved in the reflection seismic data. Recent improvements to the magnetic ship-track database and magnetic anomaly grid allowed an assessment of depth to magnetic sources and estimation of sediment thickness, providing new insight into basement depth and trends. 2D models along several seismic transects and analysis using spectral methods indicate that penetration of the lower sediments by high susceptibility bodies is probable. The reflection seismic evidence for these bodies is not clear, though in some cases they may be associated with faults and structural highs. Where the modelled bodies penetrate the sediments, they are mostly below or within Permian strata, except in the west of the strudy area. A moderate positive magnetic anomaly (the Turtle Dove Ridge) is modelled by massive bodies whose tops are 5-15 km below sea floor. The depth to magnetic basement map highlights sub-basins and structural highs within the northern Perth Basin, with up to 12 km of sediment in the Zeewyck sub-basin.
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nonGeographicDataset
eCat Id
72783
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
Keywords
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- External PublicationAbstract
- ( Theme )
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- magnetics
- ( Theme )
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- geophysics
- ( 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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2011-01-01T00:00:00
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geoscientificInformation
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