Abstract

Geoscience Australia undertook a marine survey of the Leveque Shelf (survey number (GA-0340/SOL5754), a sub-basin of the Browse Basin, in May 2013. This survey provides seabed and shallow geological information to support an assessment of the CO2 storage potential of the Browse sedimentary basin. The basin, located on the Northwest Shelf, Western Australia, was previously identified by the Carbon Storage Taskforce (2009) as potentially suitable for CO2 storage. The survey was undertaken under the Australian Government's National CO2 Infrastructure Plan (NCIP) to help identify sites suitable for the long term storage of CO2 within reasonable distances of major sources of CO2 emissions. The principal aim of the Leveque Shelf marine survey was to look for evidence of any past or current gas or fluid seepage at the seabed, and to determine whether these features are related to structures (e.g. faults) in the Leveque Shelf area that may extend to the seabed. The survey also mapped seabed habitats and biota to provide information on communities and biophysical features that may be associated with seepage. This research, combined with deeper geological studies undertaken concurrently, addresses key questions on the potential for containment of CO2 in the basin's proposed CO2 storage unit, i.e. the basal sedimentary section (Late Jurassic and Early Cretaceous), and the regional integrity of the Jamieson Formation (the seal unit overlying the main reservoir).
Google map showing geographic bounding box with values North bound -15.4 East bound 122.22 West bound 121.0 South bound -18.02

Product Type/Sub Type

dataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2014-01-01T00:00:00

Product Type

dataset

Topic Category

geoscientificInformation

GA Catalogue Number

79576 Product http://www.ga.gov.au/metadata-gateway/metadata/record/79576/

Keywords

Marine Data
Bathymetry Grid
bathymetry
marine survey
environmental
continental shelf
marine
WA
Environmental Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

Geographic Extent

North bound
-15.4
East bound
122.22
West bound
121.0
South bound
-18.02

TEMPORAL EXTENT

2013-05-01 / 2013-05-30

Lineage

The Browse Basin survey, GA-0340 SOL5754 was acquired by Geoscience Australia onboard the RV Solander from the 01st of May to the 30th of May 2013. The Chief scientist onboard was Dr. Scott Nichol and Dr. Riko Hashimoto. This dataset was acquired and processed onboard by Justy Siwabessy, Kim Picard and Olivia Wilson and further processing was conducted in the office by Michele Spinoccia, using CARIS HIPS & SIPS ver 7.1.2. 1. First a vessel configuration file was created where the co-ordinates of the motion sensor and DGPS antenna and patch test offsets were recorded. 2. A new project was then created and the vessel configuration file was attached to the project file. 3. The raw swath sonar data, in raw.all format, for each line was then imported into the project and the vessel information assigned to the data. 4. The motion sensor, DGPS and heading data were then cleaned using a filter that averaged adjacent data to remove artifacts. 5. Different sound velocity profiles data for each block were attached to the corresponding raw swath sonar data files to correct the depths for changes in the speed of sound through the water column. 6. Then a new blank field area was defined that specified the geographic area of study and the co-ordinate system used. The co-ordinates for the study areas were WGS84 UTM-51S. 7. The data was cleaned by applying several filters that removed any remaining spikes in the bathymetry data using user defined threshold values. A visual inspection of the data for each line was then undertaken where artifacts and noisy data not removed by the filtering process were removed manually using Swath and subset editors modules of the Caris HIPS/SIPS software. 8. All the data for each bathymetric, motion sensor, DGPS, heading, tide and sound velocity profile data were merged to produce the final processed data file. A weighted grid of the processed data was then created for each Block. In GA the tide was applied to the grid to correct for tidal variations and velocity corrections were performed to correct for different artifacts and mismatches. 9. The processed data was finally exported as grids soundings or false colored images for presentation and reporting and as final processed data in in ASCII XYZ as well as geotif formats of 2m resolution. 10-Using CARIS Base editor 4.0 the grids were exported as ESRI ASCII grid, then imported into ARC catalogue/info to create a raster file for the entire survey.

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

The multibeam bathymetry was acquired by the following survey: - Survey Name: GA-0340 Browse Basin Leveque Shelf Environmental Survey, SOL5754 - Vessel Name: RV Solander - Institution: Geoscience Australia - Country: Australia - Operator: AIMS - Multibeam system: Kongsberg EM3002D - Year of installation: 2013 - Nominal sonar frequency: 300 kHz - Number of heads: 1 - Number of beams/head: 160 beams - Beamwidth across track: 1.5 degree - Beamwidth along track: 1.5 degree - Pulse length: variable - Selectable depth range: 9.8m - 122m - Vessel speed: 5 - 7 knots - Start Date: 01/05/2013 - End Date: 30/05/2013 - Start Port: Broome - End Port: Broome - Grid resolution: 2 m - Number of grids: 8 - Total surface coverage: 1,241.81 km2 - Vertical Datum: MSL - Horizontal Datum: WGS84 UTM-51S - Use Limitation: This dataset is not to be used for navigational purposes.

Metadata File Identifier

f83bb58d-eb6d-55eb-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address