Data

Geoscience Australia Marine Survey GA0332 (SS05/2011): Natural hydrocarbon seepage survey of the offshore northern Perth Basin - Total chlorins and chlorin indices of seabed sediments.

Name: Geoscience Australia Marine Survey GA0332 (SS05/2011): Natural hydrocarbon seepage survey of the offshore northern Perth Basin - Total chlorins and chlorin indices of seabed sediments.
Published: 2014

Geoscience Australia

Radke, L.C. ; Trafford, J. ; Carey, M.

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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/78804&rft.title=Geoscience Australia Marine Survey GA0332 (SS05/2011): Natural hydrocarbon seepage survey of the offshore northern Perth Basin - Total chlorins and chlorin indices of seabed sediments.&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/78804&rft.publisher=Geoscience Australia&rft.description=In September and October of 2011 Geoscience Australia surveyed part of the offshore northern Perth Basin in order to map potential sites of natural hydrocarbon seepage. The primary objectives of the survey were to map the spatial distribution of seepage sites and characterise the nature of the seepage at these sites (gas vs oil, macroseepage vs microseepage; palaeo vs modern day seepage) on the basis of: acoustic signatures in the water column, shallow subsurface and on the seabed; geochemical signatures in rock and sediment samples and the water column; and biological signatures on the seabed. Areas of potential natural hydrocarbon seepage that were surveyed included proven (drilled) oil and gas accumulations, a breached structure, undrilled hydrocarbon prospects, and areas with potential signatures of fluid seepage identified in seismic, satellite remote sensing and multibeam bathymetry data. Within each of these areas the survey acquired: water column measurements with the CTD; acoustic data with single- and multi-beam echosounders, sidescan sonar and sub-bottom profiler (sidescan not acquired in Area F as it was too deep in places); and sediment and biological samples with the Smith-McIntyre Grab. In addition, data were collected with a remotely operated vehicle (ROV), integrated hydrocarbon sensor array, and CO2 sensor in selected areas. Sampling with the gravity corer had limited success in many of the more shallow areas (A-E) due to the coarse sandy nature of the seabed sediments. This dataset comprises total chlorin concentrations and chlorin indices from the upper 2 cm of seabed sediments.Maintenance and Update Frequency: asNeededStatement: Bottom sediments were collected using a Smith McIntyre grab. Chlorins were extracted from freeze-dried sediment using the method of Schubert et al. (2005). Relative standard deviations of the precisions on duplicate samples averaged 2.2% for total chlorins and 1.4% for chlorin indices (the data for each sample is provided). Schubert, C.J., Niggemann, J., Klockgether, G., and Ferdelman, G., 2005. Chlorin Index: A new parameter for organic matter freshness in sediment. Geochemistry Geophysics and Geosystems 6(3), 1-12. Thanks to the crew of the RV Southern Surveyor for help with sample acquisition.&rft.creator=Radke, L.C. &rft.creator=Trafford, J. &rft.creator=Carey, M. &rft.date=2014&rft.coverage=westlimit=112.7662; southlimit=-29.4508; eastlimit=114.74; northlimit=-27.3208&rft.coverage=westlimit=112.7662; southlimit=-29.4508; eastlimit=114.74; northlimit=-27.3208&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=oceans&rft_subject=Marine Data&rft_subject=marine environmental baselines&rft_subject=marine survey&rft_subject=continental shelf&rft_subject=seabed&rft_subject=geochemistry&rft_subject=marine&rft_subject=AU-WA&rft_subject=Marine Geoscience&rft_subject=EARTH SCIENCES&rft_subject=GEOLOGY&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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Brief description

In September and October of 2011 Geoscience Australia surveyed part of the offshore northern Perth Basin in order to map potential sites of natural hydrocarbon seepage. The primary objectives of the survey were to map the spatial distribution of seepage sites and characterise the nature of the seepage at these sites (gas vs oil, macroseepage vs microseepage; palaeo vs modern day seepage) on the basis of: acoustic signatures in the water column, shallow subsurface and on the seabed; geochemical signatures in rock and sediment samples and the water column; and biological signatures on the seabed. Areas of potential natural hydrocarbon seepage that were surveyed included proven (drilled) oil and gas accumulations, a breached structure, undrilled hydrocarbon prospects, and areas with potential signatures of fluid seepage identified in seismic, satellite remote sensing and multibeam bathymetry data. Within each of these areas the survey acquired: water column measurements with the CTD; acoustic data with single- and multi-beam echosounders, sidescan sonar and sub-bottom profiler (sidescan not acquired in Area F as it was too deep in places); and sediment and biological samples with the Smith-McIntyre Grab. In addition, data were collected with a remotely operated vehicle (ROV), integrated hydrocarbon sensor array, and CO2 sensor in selected areas. Sampling with the gravity corer had limited success in many of the more shallow areas (A-E) due to the coarse sandy nature of the seabed sediments. This dataset comprises total chlorin concentrations and chlorin indices from the upper 2 cm of seabed sediments.

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Maintenance and Update Frequency: asNeeded

Statement: Bottom sediments were collected using a Smith McIntyre grab. Chlorins were extracted from freeze-dried sediment using the method of Schubert et al. (2005). Relative standard deviations of the precisions on duplicate samples averaged 2.2% for total chlorins and 1.4% for chlorin indices (the data for each sample is provided). Schubert, C.J., Niggemann, J., Klockgether, G., and Ferdelman, G., 2005. Chlorin Index: A new parameter for organic matter freshness in sediment. Geochemistry Geophysics and Geosystems 6(3), 1-12. Thanks to the crew of the RV Southern Surveyor for help with sample acquisition.

Issued: 2014

This dataset is part of a larger collection

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text: westlimit=112.7662; southlimit=-29.4508; eastlimit=114.74; northlimit=-27.3208

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uri : https://d28rz98at9flks.cloudfront.net/78804/78804_Chlorins_v2.xls External Link

Identifiers

DOI : 10.4225/25/54B8639C694E1
URI : pid.geoscience.gov.au/dataset/ga/78804
global : efd51b52-d7e9-6b16-e044-00144fdd4fa6

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