Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Bulk organic carbon and nitrogen isotopes and concentrations in seabed sediments.

Geoscience Australia undertook a marine survey of the Vlaming Sub-basin in March and April 2012 to provide seabed and shallow geological information to support an assessment of the CO2 storage potential of this sedimentary basin. 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 Vlaming Sub-basin is located offshore from Perth, Western Australia, and was previously identified by the Carbon Storage Taskforce (2009) as potentially highly suitable for CO2 storage. The principal aim of the Vlaming Sub-basin marine survey (GA survey number GA334) 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 Vlaming Sub-basin that may extend up to the seabed. The survey also mapped seabed habitats and biota in the areas of interest to provide information on communities and biophysical features that may be associated with seepage. This research addresses key questions on the potential for containment of CO2 in the Early Cretaceous Gage Sandstone (the basin's proposed CO2 storage unit) and the regional integrity of the South Perth Shale (the seal unit that overlies the Gage Sandstone). This dataset comprises bulk organic carbon and nitrogen isotopes and concentrations from seabed sediments (0-2 cm).

澳大利亚地质调查局（Geoscience Australia）于2012年3月至4月对弗拉明次盆地（Vlaming Sub-basin）开展海洋地质勘测，以获取海底与浅层地质资料，支撑该沉积盆地的二氧化碳（CO2）储集潜力评估。本次勘测依据澳大利亚政府国家二氧化碳基础设施计划（National CO2 Infrastructure Plan, NCIP）实施，旨在识别距离主要碳排放源较近、适合长期储存二氧化碳的场址。弗拉明次盆地位于西澳大利亚州珀斯近海，此前已被碳储存专责小组（Carbon Storage Taskforce, 2009）认定为具备极高二氧化碳储存适配性的区域。本次弗拉明次盆地海洋地质勘测（澳大利亚地质调查局勘测编号GA334）的核心目标，是探查海底过往及当前存在的气体或流体渗漏证据，并探明此类渗漏特征是否与延伸至海底的弗拉明次盆地构造（如断层）存在关联。本次勘测同时对目标区域的海底生境与生物群落开展制图工作，以获取与渗漏现象相关的群落及生物物理特征相关信息。本研究聚焦两大核心科学问题：一是早白垩世盖奇砂岩（Gage Sandstone，该盆地拟用的二氧化碳储集层）的二氧化碳封存可行性，二是覆于盖奇砂岩之上的南珀斯页岩（South Perth Shale，盖层）的区域完整性。本数据集包含取自海底沉积物（0~2 cm层位）的总有机碳、氮同位素数据及其浓度值。