Seabed environments and shallow geology of the Leveque Shelf, Browse Basin, Western Australia - Processed multichannel sub bottom profiler data

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 sparker sub bottom profiles processed as shallow, high resolution, multichannel seismic reflection data (SEG-Y format), navigation files (P190) and stacking velocities.

2013年5月，澳大利亚地质调查局（Geoscience Australia）对布劳斯盆地（Browse Basin）的次级盆地——勒弗克陆架（Leveque Shelf）开展了海洋勘测，勘测编号为SOL5754/GA0340。本次勘测获取了海底与浅层地质数据，用于支撑布劳斯沉积盆地的二氧化碳封存潜力评估工作。该盆地位于西澳大利亚州西北陆架，此前已于2009年被碳封存工作组（Carbon Storage Taskforce）认定具备二氧化碳封存的潜在可行性。本次勘测依托澳大利亚政府的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、适合长期封存二氧化碳的场址。勒弗克陆架海洋勘测的核心目标为：查找海底既往或现存的气体或流体渗漏证据，并研判此类特征是否与勒弗克陆架区域内可延伸至海底的构造（如断层）相关。本次勘测同时对海底生境与生物群落开展了制图工作，以获取可能与渗漏活动相关的群落与生物物理特征相关数据。本项研究与同步开展的深部地质研究相结合，旨在解答两大核心问题：一是盆地拟用二氧化碳封存单元（即晚侏罗世至早白垩世基底沉积段）的二氧化碳封存封闭潜力，二是覆于主储层之上的盖层单元——詹姆森组（Jamieson Formation）的区域封闭完整性。本数据集包含经处理的电火花震源海底浅层剖面数据（已处理为浅层高分辨率多道地震反射数据，格式为SEG-Y）、P190导航文件以及叠加速度数据。