Seabed environments and shallow geology of the Leveque Shelf, Browse Basin, Western Australia: Total organic carbon (TOC) and total nitrogen concentrations and isotopes of seabed sediments.

Geoscience Australia undertook a marine survey of the Leveque Shelf (survey number SOL5754/GA0340), 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). This dataset comprises total chlorin concentrations and chlorin indices from the upper 2cm of seabed sediments.

澳大利亚地球科学局（Geoscience Australia）于2013年5月对布劳斯盆地（Browse Basin）的次级盆地——莱夫克陆架（Leveque Shelf）开展了编号为SOL5754/GA0340的海洋勘测。本次勘测获取了海底与浅层地质数据，以支撑布劳斯沉积盆地的二氧化碳（CO2）封存潜力评估。该盆地坐落于澳大利亚西北陆架，此前已被碳封存专项工作组（Carbon Storage Taskforce，2009）认定为具备二氧化碳封存潜力的潜在区域。本次勘测依托澳大利亚政府国家二氧化碳（CO2）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合理范围内、适宜长期封存二氧化碳的场地。莱夫克陆架海洋勘测的核心目标为：搜寻海底过往或当前存在气体或流体渗漏的相关证据，并判定此类渗漏特征是否与延伸至海底的莱夫克陆架区域构造（如断层）存在关联。本次勘测同时对海底生境与生物群落开展了制图工作，以获取与渗漏相关的群落及生物物理特征信息。本项研究结合同期开展的深层地质研究，解答了两项关键科学问题：一是盆地拟议二氧化碳封存单元（即晚侏罗世至早白垩世基底沉积剖面）的二氧化碳封存潜力，二是覆盖主力储层的杰米森组（Jamieson Formation）区域盖层的完整性。本数据集包含海底沉积物表层2厘米范围内的总氯浓度与氯指数。