| 航空电磁勘查技术发展现状及展望 |
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| 引用本文： | 殷长春,张博,刘云鹤,任秀艳,齐彦福,裴易峰,邱长凯,黄鑫,黄威,缪佳佳,蔡晶.航空电磁勘查技术发展现状及展望[J].地球物理学报,2015,58(8):2637-2653. |
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| 作者姓名： | 殷长春 张博 刘云鹤 任秀艳 齐彦福 裴易峰 邱长凯 黄鑫 黄威 缪佳佳 蔡晶 |
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| 作者单位： | 吉林大学地球探测科学与技术学院, 长春 130026 |
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| 基金项目： | 国家自然科学基金项目(41274121)和国家青年基金项目(41404093)、国家重大科研装备研究项目(ZDYZ2012-1-03和20130523MTEM05)、吉林大学研究生创新基金资助项目(2015053)联合资助. |
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| 摘 要： | 航空电磁作为一种高效的地球物理勘查技术手段,其发展在国外(加拿大、澳大利亚等国家)已十分成熟.然而,在我国该项技术仍处于发展当中,在国内目前尚未形成具有实际探测能力的航空电磁系统和解释手段.这一现状严重影响了我国对地形地质条件复杂区域(比如广大西部地区)矿产资源勘查的需求.本文旨在通过系统介绍航空电磁勘查技术中的基础理论、关键技术、仪器系统、数据处理、解释及应用,并对未来我国航空电磁勘查技术的发展提出建议,使读者了解该技术未来发展方向和研究热点,以期该项技术在我国得到快速发展并获得广泛应用.
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| 关 键 词： | 矿产资源勘查 航空电磁勘查技术 频域和时域航空电磁系统 电磁数据处理 数据成像和解释 |
| 收稿时间： | 2014-12-14 |
Review on airborne EM technology and developments |
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| YIN Chang-Chun,ZHANG Bo,LIU Yun-He,REN Xiu-Yan,QI Yan-Fu,PEI Yi-Feng,QIU Chang-Kai,HUANG Xin,HUANG Wei,MIAO Jia-Jia,CAI Jing.Review on airborne EM technology and developments[J].Chinese Journal of Geophysics,2015,58(8):2637-2653. |
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| Authors: | YIN Chang-Chun ZHANG Bo LIU Yun-He REN Xiu-Yan QI Yan-Fu PEI Yi-Feng QIU Chang-Kai HUANG Xin HUANG Wei MIAO Jia-Jia CAI Jing |
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| Institution: | College of Geo-exploration Sciences and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | As an effective and efficient geophysical tool, airborne EM(AEM)is specifically suitable for the exploration in areas of high mountains, desert, swamp, and forest. With the development of national economy of China, the demand for mineral resources increases sharply, geophysical explorations in areas with favorable geological conditions have been accomplished. The exploration target is switched to areas with unfavorable and complicated geological conditions, such as in Western China. Airborne EM works efficiently due to its moving platform of helicopter or fixed-wing aircraft, no human access is needed to the survey area. This technology is especially applicable for exploration in Western China with rugged mountains and deserts. In this paper, we review AEM technology systematically with the goal to make this technology quickly applicable in the mineral exploration in China.
To make a comprehensive review, we introduce the AEM technology in following sequences. We first present basic AEM theory of on/off time, apparent resistivity and depth, footprint, etc. Then, we introduce the developments of AEM technology in Western countries, including CGG/Fugro, Geotech and Aeroquest in Canada, SkyTEM survey in Denmark, and we address specifically the status of this technology in China. Since the modeling and inversions are fundamental for AEM, we present 1D/2D/3D forward theory based on semi-analytical solutions, finite element, finite difference and integral equation methods. For the inversion theory, we follow the rule from simple to complex models by presenting 1D Marquardt, LCI, and 2/3D inversions by GS, NLCG and QN. Finally, we introduce successful applications of AEM technology in mineral, oil & gas, E&E, ground water, and natural hazard forest. We give our suggestions on future development of AEM technology in China.
AEM technologies have been well developed in Western countries and are playing very important role in mineral, oil & gas, E&E, ground water explorations. However, AEM has not been well developed in China to the extent of practical use due to the fact that no breakthrough has been made on key technologies. Due to the fact that time-domain and frequency-domain AEM have different features and applications, we suggest to develop AEM technology in both frequency-and time-domain in China. The frequency-domain AEM is used in E&E, ground water exploration, while time-domain AEM is used in mineral, oil & gas in deep earth. Semi-airborne EM has serious problems of volume effect and thus is not recommended. Unmanned aerial vehicle(UAV)has a small load, making it difficult to transmit high-power signal. Besides, UAV doesn't suit the complex climate and topography, so that it is not recommended, either.
To explore the vast area in Western China with rugged mountains, desert, etc., we need to develop geophysical technologies based on moving platforms, like airborne EM. Considering that different AEM systems suit for different exploration targets, both frequency-and time-domain systems need to be developed. Both semi-airborne and UAV are not recommended for airborne EM due to their inherent defects, a full airborne EM technology is the best solution. |
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| Keywords: | Mineral exploration Airborne EM(AEM) Frequency-domain and time-domain AEM systems AEM data processing Imaging and data interpretation |
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