Geophysical Survey Datasets - Airborne Electromagnetics

Airborne Electromagnetic (AEM) data are used in minerals, energy, and groundwater resource exploration. The AEM technique takes advantage of natural variations in electrical conductivity beneath the surface, which results from variation in rock and pore fluid properties. The presence of electrically conductive minerals such as graphite, clays, and sulfide minerals, or electrically conductive fluid such as saline groundwater, results in greater conductivity relative to non-conductive mineral assemblages, or non-conductive fluid (typically fresh ground water).AEM data are collected by transmitting an electromagnetic signal from a system attached to a plane or helicopter. The signal induces eddy currents in the ground which are detected by receiver coils towed below and behind the aircraft. Precompetitive AEM data and associated scientific analysis assists exploration under cover by reducing risk, stimulating investment and promoting exploration for commodities. In recent years, Geoscience Australia has flown Airborne Electromagnetic (AEM) surveys across regional Australia. Data and associated interpretations from such regional surveys have led to tenement take up, stimulated exploration for a number of commodities.航空电磁数据（Airborne Electromagnetic, AEM）广泛应用于矿产、能源与地下水资源勘探领域。航空电磁技术依托地表下方天然存在的电导率差异，而这类差异源于岩石与孔隙流体性质的变化。若存在石墨、黏土、硫化物矿物等导电矿物，或是咸水地下水等导电流体，其所在区域的电导率将显著高于非导电矿物组合或非导电流体（通常为淡水地下水）。航空电磁数据的采集方式为：搭载于飞机或直升机的发射系统向外发射电磁信号，该信号会在地下感应出涡流，由挂载于航空器下方及后方的接收线圈完成探测。预竞争航空电磁数据及其配套科学分析，可通过降低勘探风险、激发投资活力、推动商品资源勘探，助力隐伏覆盖区的资源勘探工作。近年来，澳大利亚地质调查局（Geoscience Australia）已在澳大利亚全境多个区域开展航空电磁测量工作。此类区域测量所获数据及相关解译成果，已推动了矿业权的获取，并激发了多种商品资源的勘探活动。