| 地-空瞬变电磁法电阻率成像研究与应用 |
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| 引用本文： | 马振军,底青云,薛国强,高雅.地-空瞬变电磁法电阻率成像研究与应用[J].地球物理学报,2021,64(3):1090-1105. |
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| 作者姓名： | 马振军 底青云 薛国强 高雅 |
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| 作者单位： | 中国科学院深地资源装备技术工程实验室,中国科学院地质与地球物理研究所,北京 100029;中国科学院页岩气与地质工程重点实验室,中国科学院地质与地球物理研究所,北京 100029;中国科学院地球科学研究院,北京 100029;中国科学院大学,北京 100049;中国科学院地球科学研究院,北京 100029;中国科学院大学,北京 100049;中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京 100029 |
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| 基金项目： | 北京市科技计划"地球深部探测技术"攻关专项"大深度航空电磁探测系统研制" |
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| 摘 要： | 地-空瞬变电磁法(Semi-airborne transient electromagnetic,SATEM)凭借适应能力强、探测深度大、实时性强等特点,适用于湖泊、沼泽、山区等地形复杂地区观测.SATEM接收数据量大、精度要求高,传统成像方法基于地面视电阻率计算未考虑飞行高度,开展SATEM的高精度快速成像研究对实际运用有重要作用.针对SATEM中电性源发射装置感应电流分布,接收装置设置于空中以及两者不在相同平面的特点,本文考虑横向、纵向感应电流差异,飞行高度对视电阻率影响等因素,提出电性源SATEM电阻率成像方法.首先,基于电性源瞬变电磁场感应电流分布特征及各分量空间分布、扩散特性分析,推导出基于均匀半空间磁场与感应电压解析解,然后定义了电性源地-空瞬变电磁法早期、晚期、全期视电阻率;最后根据对感应电流分布分析定义了横向分量和纵向分量的成像深度,并研究了成像深度受飞行高度、发射磁矩、偏移距、偏移角度的影响;对煤炭采空区的实测结果表明,利用本文提出的电阻率成像方法可以更加精确定位目标体位置.
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| 关 键 词： | 电性源 地-空瞬变电磁法 电阻率-深度成像 采空区探测 |
The research and application of resistivity imaging of semi-airborne transient electromagnetic method |
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| MA ZhenJun,DI QingYun,XUE GuoQiang,GAO Ya.The research and application of resistivity imaging of semi-airborne transient electromagnetic method[J].Chinese Journal of Geophysics,2021,64(3):1090-1105. |
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| Authors: | MA ZhenJun DI QingYun XUE GuoQiang GAO Ya |
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| Institution: | (CAS Engineering Laboratory for Deep Resources Equipment and Technology,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029 China) |
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| Abstract: | With strong adaptability,deep detection and good real timeliness,SATEM is suitable for observation in lakes,swamps,mountains and other areas with complex terrains.SATEM has a large amount of received data and high accuracy requirements.The traditional imaging method based on the ground resistivity calculation does not consider height,and the calculation of the imaging depth needs to be more accurate.It is important to carry out the high-precision and fast imaging research of SATEM for practical applications.According to the characteristics of the induced current distribution of the electrical source transmitter,the receiver set in the air and the two are not on the same plane,the paper proposes the resistivity imaging method of SATEM considering the differences between the horizontal and vertical induction current,the impact of height on the apparent resistivity.Firstly,the paper analyzes the distribution characteristics of the induced current,the spatial distribution and diffusion characteristics of each component of TEM field with an electrical source.Secondly,based on the analytical solution of the uniform half space magnetic field and the induced voltage,the apparent resistivity of the early,late and full period are defined.Finally,the imaging depths of transverse and longitudinal components are defined based on the analysis of the induced current distribution,and the effects of the imaging depths by flight height,emitted magnetic moment,offset distance,and offset angle are investigated;the results of the actual measurements on the coal mining area show that the target position can be more precisely located using the resistivity imaging method proposed in this paper. |
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| Keywords: | Semi-airborne transient electromagnetic(SATEM) Resistivity imaging method Imaging depth Goaf detection |
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