Seabed environments and shallow geology of the Leveque Shelf, Browse Basin, Western Australia - interpreted geomorphic map

In May 2013, Geoscience Australia (GA) and the Australian Institute of Marine Science (AIMS) undertook a collaborative seabed mapping survey (GA0340/ SOL5754) on the Leveque Shelf, a distinct geological province within the Browse Basin, offshore Western Australia. The purpose of the survey was to acquire geophysical and biophysical data on seabed environments over a previously identified potential CO2 injection site to better understand the overlying seabed habitats and to assess potential for fluid migration to the seabed.

Mapping and sampling was undertaken across six areas using multibeam and single beam echosounders, sub-bottom profilers, sidescan sonar, underwater towed-video, gas sensors, water column profiler, grab samplers, and vibrocorer. Over 1070 km2 of seabed and water column was mapped using the multibeam and single beam echosounder, in water depths ranging between 40 and 120 m. The sub-surface was investigated using the multichannel and the parametric sub-bottom profilers along lines totalling 730 km and 1547 km in length respectively. Specific seabed features were investigated over 44 line km using the sidescan sonar and physically and sampled at 58 stations.

Integration of this newly acquired data with existing seismic data will provide new insights into the geology of the Leveque Shelf. This work will contribute to the Australian Government's National CO2 Infrastructure Plan (NCIP) by providing key seabed environmental and geological data to better inform the assessment of the CO2 storage potential in this area of the Browse Basin.

This catalogue entry refers to an interpreted geomorphic map, mapped at 1:10 000 scale. Geomorphic mapping was completed using a combination of semi-automated feature extraction and hand digitisation from bathymetry and backscatter grids collected during the survey along with their derivatives and reference to broader scale geomorphic maps (Heap and Harris, 2008).

2013年5月，澳大利亚地质调查局（Geoscience Australia, GA）与澳大利亚海洋科学研究所（Australian Institute of Marine Science, AIMS）在西澳大利亚近海布劳斯盆地内的独特地质单元——利夫奎厄陆架（Leveque Shelf），联合开展了编号为GA0340/SOL5754的海底测绘调查。本次调查旨在针对此前已识别的潜在二氧化碳注入场址，采集其海底环境的地球物理与生物物理数据，以深入了解上覆海底生境，并评估流体向海底运移的潜在可能性。

本次调查在6个区域内开展作业，所用设备包括多波束与单波束回声测深仪、亚底质剖面仪、侧扫声呐、水下拖曳视频系统、气体传感器、水体剖面仪、抓斗取样器及振动岩心取样器。研究团队利用多波束与单波束回声测深仪，完成了覆盖面积超1070平方千米的海底与水体柱测绘，作业水深介于40至120米之间。分别采用多道亚底质剖面仪和参数型亚底质剖面仪开展地下探测，两类测线的总长度分别为730千米和1547千米。团队针对总长44千米的测线范围内的特定海底特征开展了探测，并在58个站位进行了实体采样。

将本次新获取的数据与现有地震数据进行整合，将为利夫奎厄陆架的地质研究提供全新认知。本项工作将为澳大利亚政府的国家二氧化碳基础设施计划（National CO2 Infrastructure Plan, NCIP）提供关键的海底环境与地质数据，从而为布劳斯盆地该区域的二氧化碳封存潜力评估提供更充分的决策依据。

本目录条目对应的是经解译的地貌图，比例尺为1:10000。本次地貌测绘结合了半自动特征提取与人工数字化手段，数据基础为本次调查采集的水深与反向散射栅格数据及其衍生数据集，并参考了大尺度地貌图（Heap与Harris，2008）。