Georgetown, Queensland, 2024 Airborne Electromagnetic Survey NRG XCITE™ airborne electromagnetic data and GALEI conductivity estimates

The Georgetown, Queensland, 2024 Airborne Electromagnetic Survey was conducted by Geoscience Australia in collaboration with the Geological Survey of Queensland. The survey aimed to enhance geological understanding and support mineral exploration and groundwater research in the region.The primary goal was to acquire detailed electromagnetic and magnetic geophysical data to improve understanding of subsurface geological formations, which could aid in mineral exploration and groundwater studies. This survey will be included in the national AusAEM airborne electromagnetic acquisition program, which aims to provide geophysical information to support investigations of regional geology and groundwater systems. This data will help to better characterise architecture of aquifers within the upper 200-300 hundred meters of the subsurface. It will also provide insights to trends in regolith thickness and variability, variations in bedrock conductivity, the conductivity of key bedrock (lithology-related) conductive units under cover, and the groundwater systems of the region at a reconnaissance scale.New Resolution Geophysics Pty. Ltd. (NRG) was commissioned for data acquisition and processing. The survey was carried out between August and November 2024, covering 10,600 flight-line kilometres with a nominal line spacing of 2 kilometres. NRG’s XCITE™ airborne electromagnetic system was used to collect the data. The survey lines were oriented East-West, with a nominal terrain clearance of 40 meters. Subsurface conductivity models were derived using Geoscience Australia’s deterministic, 1D Layered-Earth Inversion (GALEI) code combined with noise estimates determined by NRG.The data package also contains the results and derived products from data Geoscience Australia staff inverted using Internally developed sample-by-sample deterministic layered-earth (1D) inversion algorithm GALEISBS.NRG delivered data is available on request from [e-mail] - Quote eCat# 150184

2024年昆士兰州乔治敦航空电磁调查由澳大利亚地球科学局（Geoscience Australia）与昆士兰州地质调查局合作开展。本次调查旨在加深区域地质认知，为当地矿产勘探与地下水研究提供支撑。其核心目标为获取详细的电磁与磁法地球物理数据，以深化对地下地质地层的理解，助力矿产勘探与地下水研究工作。本调查将纳入澳大利亚全国性AusAEM航空电磁采集项目，该项目旨在提供地球物理信息，支撑区域地质与地下水系统调查。本次采集的数据将助力更精准地刻画地下200至300米范围内含水层的空间结构特征，同时可为风化层厚度的变化趋势与差异、基岩电导率变化、覆盖层下关键岩性关联导电单元的电导率，以及该区域踏勘尺度下的地下水系统特征提供新认知。本次数据采集与处理工作由新分辨率地球物理私人有限公司（New Resolution Geophysics Pty. Ltd.，简称NRG）承接。调查于2024年8月至11月间开展，作业飞行总里程达10600飞行公里，标称测线间距为2公里。数据采集采用NRG的XCITE™航空电磁系统。测线方向为东西向，标称离地高度为40米。地下电导率模型通过澳大利亚地球科学局的确定性一维层状地球反演（GALEI）代码生成，并结合NRG提供的噪声估算结果。本次数据包还包含澳大利亚地球科学局工作人员使用自研逐样本确定性层状地球（一维）反演算法GALEISBS处理得到的反演结果与衍生产品。NRG交付的数据可通过邮箱[e-mail]申请获取，申请时请注明eCat编号150184。