Analysis of seabed features for the signs of seepage: results from the recent marine surveys in the southern Perth and Bonaparte basins  

Authors / CoAuthors

Jorgensen, D.C. | Borissova, I. | Bernardel, G. | Carroll, A.G. | Consoli, C.

Abstract

In 2012, Geoscience Australia carried out marine environmental surveys in the Vlaming Sub-basin, Perth Basin (GA0334) and Petrel Sub-basin, Bonaparte Basin (GA0335). The purpose of these surveys was to gather pre-competitive geophysical and biophysical data on the seabed environments within targeted areas of the sub-basins to help with the assessment of CO2 storage potential. Over the duration of the Vlaming Sub-basin survey, approximately 650 km2 of multibeam sonar data and 2300 line km of sub-bottom profiler (SBP) data were collected. Also acquired was 6.65 km2 of sidescan sonar imagery, 4.25 km of video footage and 89 grab samples. More than 650 km2 of multibeam sonar data and 650 line km of multi-channel SBP data was acquired during the Petrel Sub-basin survey. A total of 114 sampling operations recovered shallow samples or video footage for sedimentological, biological and chemical analysis. These datasets have been used to investigate possible fluid pathways in the shallow subsurface geology. In the Petrel Sub-basin, banks, palaeo-channels, plains, ridges and pockmark fields characterise the seafloor. While in the Vlaming Sub-basin, a Holocene sediment-starved system was observed with shallow valleys, shallow terraces, sediment mega-ripples and prominent ridges on the seafloor. The complexity of these environments and the general spatial correlation between seabed features and the subsurface geology, suggest that a large number of processes have interacted to give rise to the present geomorphology of the continental shelves. These new datasets have been used to support the regional assessment of CO2 storage prospectivity in the Vlaming and Petrel sub-basins.

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nonGeographicDataset

eCat Id

74820

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Keywords

• External PublicationAbstract

( Theme )

• marine survey

( Theme )

• geological storage of CO2

( Theme )

• sedimentology

( Theme )

• geomorphology

( Theme )

• seabed

( Theme )

• marine

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_Internal

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2013-01-01T00:00:00

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