Seabed environments and shallow geology of the Leveque Shelf, Browse Basin, Western Australia - %Carbonate and specific surface area 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——莱弗奎克陆架（Leveque Shelf）开展了编号为SOL5754/GA0340的海洋勘测。本次勘测获取了海床与浅层地质数据，用于支撑布劳斯沉积盆地的二氧化碳封存（CO2 storage）潜力评估工作。该盆地位于西澳大利亚州西北陆架，此前已被碳封存特别工作组（Carbon Storage Taskforce，2009）认定为具备二氧化碳封存潜力的候选区域。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）开展，旨在识别距离主要碳排放源较近、适宜长期封存二氧化碳的场址。莱弗奎克陆架海洋勘测的核心目标为搜寻海床存在过往或当前气体、流体渗漏的证据，并查明此类渗漏特征是否与延伸至海床的莱弗奎克陆架区域构造（如断层）存在关联。此外，本次勘测还完成了海床生境与生物群落的制图工作，以获取与渗漏现象相关的群落及生物物理特征信息。本研究结合同期开展的深部地质研究，解答了两大关键科学问题：一是该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）的二氧化碳封存密封性潜力；二是覆盖主储层的杰米森组（Jamieson Formation）盖层的区域完整性。本数据集包含海床表层2cm沉积物中的总氯浓度与氯指数。