Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Sediment oxygen demand of 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 sediment oxygen demand measurments from seabed sediments.

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（Vlaming Sub-basin）开展海洋勘测，以获取海底与浅层地质资料，支撑该沉积盆地的二氧化碳封存潜力评估。本次勘测依托澳大利亚政府《国家二氧化碳基础设施计划》（National CO2 Infrastructure Plan, NCIP）实施，旨在识别距离主要二氧化碳排放源合理范围内、适于长期封存二氧化碳的场址。弗拉明次盆位于澳大利亚西部珀斯近海，此前已被碳封存专责小组（Carbon Storage Taskforce, 2009）认定为具备极高二氧化碳封存潜力的区域。本次弗拉明次盆海洋勘测（澳大利亚地质调查局勘测编号GA334）的核心目标为搜寻海底过往或当前存在的气体与流体渗漏证据，并研判此类渗漏特征是否与可延伸至海底的弗拉明次盆构造（如断层）相关。此外，勘测还对目标区域的海底生境与生物群落进行了填图，以获取与渗漏相关的生物群落及生物物理特征相关数据。本研究聚焦于两项关键科学问题：一是早白垩世盖奇砂岩（Early Cretaceous Gage Sandstone，该盆地拟议的二氧化碳储层单元）的二氧化碳封存容纳潜力；二是覆于盖奇砂岩之上的南珀斯页岩（South Perth Shale，盖层单元）的区域完整性。本数据集包含海底沉积物的沉积物氧需求量测量数据。