Leveque Shelf Browse Basin Marine Survey (GA-0340/SOL5754) (NCIP Program) - High Resolution Multibeam Acoustic Backscatter Grids

This resource contains backscatter data for the the Leveque Shelf, a sub-basin of the Browse Basin, in May 2013 on RV Solander (survey GA0340/SOL5754). The survey used a Kongsberg EM3002 300 kHz multibeam sonar system mounted in single head configuration to map six areas, covering a combined area of 1070 square kilometres. Data are gridded to 2 m spatial resolution. 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)

本数据集包含2013年5月“索兰德号”（RV Solander）科考调查船执行航次GA0340/SOL5754时，在布劳斯盆地（Browse Basin）次级盆地勒韦克陆架（Leveque Shelf）采集的反向散射数据。本次调查采用单换能器构型的康斯伯格EM3002型300kHz多波束声呐系统（Kongsberg EM3002 300 kHz multibeam sonar system），完成了6个区域的海底测绘，总覆盖面积达1070平方千米，数据已网格化至2米空间分辨率。本次调查获取的海底与浅层地质数据，可为布劳斯沉积盆地的二氧化碳（CO2）封存潜力评估提供支撑。该盆地位于澳大利亚西北陆架（Northwest Shelf），此前已被碳封存任务组（Carbon Storage Taskforce，2009年）认定为具备二氧化碳封存潜力的候选区域。本调查系澳大利亚政府国家二氧化碳基础设施计划（National CO2 Infrastructure Plan, NCIP）的实施内容之一，旨在识别距离主要碳排放源合理范围内的长期二氧化碳封存场址。勒韦克陆架海洋调查的核心目标为：搜寻海底古今气体或流体渗漏的相关证据，并探明此类渗漏特征是否与勒韦克陆架区域可延伸至海底的构造（如断层）相关。此外，本次调查还对海底生境与生物群进行了测绘，以获取与渗漏相关的生物群落及生物物理特征相关信息。本研究结合同期开展的深层地质研究，旨在解答两大关键科学问题：一是该盆地拟议二氧化碳储集单元（即晚侏罗世至早白垩世基底沉积剖面）的二氧化碳封存储量潜力，二是作为主储层上覆盖层的贾米森组（Jamieson Formation）的区域构造完整性。