Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1448-1456.doi: 10.13278/j.cnki.jjuese.20180224

Previous Articles     Next Articles

Research on Exploration Depth of Time-Domain Airborne EM System

Han Xue, Yin Changchun, Ren Xiuyan, Liu Yunhe, Zhang Bo, Cai Jing   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-08-24 Published:2019-10-10
  • Supported by:
    Supported by National Key R & D Program of China (2016YFC0303100, 2017YFC0601903,2018YFC0603300), Special Funds for Basic Research of the Central Public Research Institutions (JYYWF20180103), National Natural Science Foundation of China (41530320, 41774125) and Pilot Project of Chinese Academy of Sciences (XDA14020102)

Abstract: The exploration depth of a time-domain airborne electromagnetic (EM) system is closely related to many factors such as sampling time, transmitting dipole moment, earth conductivity, instrument background noise,and sensitivity. This study is about the exploration depth of time-domain airborne EM systems based on time-domain one-dimensional forward modeling. The forward algorithm starts from the Maxwell equation and combines the quasi-static approximation conditions to obtain the vertical component of the EM field response in the frequency domain of the central loop over a one-dimensional layered medium. Hankel integral is used to calculate the EM responses in frequency-domain and then obtain the time-domain responses via time-frequency transform. We set the minimum identifiable signal threshold to be three times of the system background noise level to obtain the maximum detectable departure time, from which we obtained the maximum depth of exploration with the average conductivity. Finally, taking the VTEM system as an example, we analyzed and discussed the maximum exploration depth of airborne EM system in the time domain under different layered media models and different transmission magnetic moments, background noise, transmission pulse width and flight altitude.

Key words: time-domain, airborne EM, exploration depth, noise level

CLC Number: 

  • P613.3
[1] 殷长春,张博,刘云鹤,等.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. Yin Changchun, Zhang Bo, Liu Yunhe, et al. Status and Prospects of Airborne EM Survey Technology Development[J]. Chinese Journal of Geophysics, 2015, 58(8):2637-2653.
[2] 曾昭发,霍祉君,李文奔,等.任意各向异性介质三维有限元航空电磁响应模拟[J].吉林大学学报(地球科学版),2018,48(2):433-444. Zeng Zhaofa, Huo Zhijun, Li Wenben, et al. 3D Vector Finite Element Airborne Electromagnetic Modellinginan Arbitrary Anisotropic Medium[J].Journal of Jilin University (Earth Science Edition),2018, 48(2):433-444.
[3] 赵越,许枫,李貅.时间域航空电磁系统回顾及其应用前景[J].地球物理学进展,2017,32(6):2709-2716. Zhao Yue, Xu Feng, Li Xiu. Review of Time Domain Airborne EM System and Its Application Prospects[J]. Progress in Geophysics, 2017, 32(6):2709-2716.
[4] 朴化荣,沙树琴,王延良.均匀大地上空的时间域电磁响应[J].地球物理学报,1980,23(2):207-218. Piao Huarong, Sha Shuqin, Wang Yanliang. Time Domain Electromagnetic Response over Homogeneous Earth[J]. Chinese Journal of Geophysics, 1980, 23(2):207-218.
[5] Liu G. Effect of Transmitter Current Waveform on Airborne TEM Response[J]. Exploration Geophysics,1998,29(2):35-41.
[6] 罗延钟,张胜业,王卫平.时间域航空电磁法一维正演研究[J].地球物理学报,2003,46(5):719-724. Luo Yanzhong, Zhang Shengye, Wang Weiping. One-Dimensional Forward Modeling of Time Domain Aeromagnetic Method[J]. Chinese Journal of Geophysics, 2003, 46(5):719-724.
[7] Yin C, Smith R S, Hodges G, et al. Modeling Results of On-and Off-Time B and dB/dt for Time-Domain Airborne EM Systems[C]//70th Annual EAGE Conference and Exhibition. Rome:EAGE, 2008:1-4.
[8] Huang H, Fraser D C. Airborne Resistivity and Susceptibility Mapping Magnetically Polarizable Areas[J]. Geophysics, 2000, 65(2):502-511.
[9] 王卫平,王守坦.直升机频率域航空电磁系统在均匀半空间上方的电磁响应特征与探测深度[J].地球学报,2003,24(3):285-288. Wang Weiping, Wang Shoutan. Electromagnetic Response Characteristics and Detection Depth of Helicopter Frequency Domain Aeromagnetic System Above Homogeneous Half Space[J]. Journal of Earth, 2003, 24(3):285-288.
[10] 朱凯光,林君,刘长胜,等.频率域航空电磁法一维正演与探测深度[J].地球物理学进展,2008,23(6):1943-1946. Zhu Kaiguang, Lin Jun, Liu Changsheng, et al. One-Dimensional Forward Modeling and Depth of Exploration in Frequency Domain Airborne EM Method[J]. Progress in Geophysics, 2008, 23(6):1943-1946.
[11] 毛立峰.电场扩散深度法估计固定翼航空瞬变电磁探测深度[J].地球科学期刊:中英文版,2013(3):81-87. Mao Lifeng. Estimation of Aeronautical Transient Electromagnetic Detection Depth in Fixed Domain by Electric Field Diffusion Depth Method[J]. Scientific Journal of Earth Science, 2013(3):81-87.
[12] 殷长春,任秀艳,刘云鹤,等.航空瞬变电磁法对地下典型目标体的探测能力研究[J].地球物理学报,2015,58(9):3370-3379. Yin Changchun, Ren Xiuyan, Liu Yunhe, et al. Exploration Capability of Airborne TEM Systems for Typical Targets in the Subsurface[J]. Chinese Journal of Geophysics, 2015, 58(9):3370-3379.
[13] 裴易峰,殷长春,刘云鹤,等.时间域航空电磁磁场计算与应用[J].地球物理学进展,2014,29(5):2191-2196. Pei Yifeng, Yin Changchun, Liu Yunhe, et al. Calculation and Application of B-Field for Time-Domain Airborne EM[J]. Progress in Geophysics, 2014, 29(5):2191-2196.
[14] 殷长春.瞬变电磁测深法的研究深度[J].长春地质学院学报,1992,22(1):103-107. Yin Changchun. Research Depth of Transient Electromagnetic Sounding[J]. Journal of Changchun Institute of Geology,1992,22(1):103-107.
[15] 邱长凯.时间域航空电磁法一维正反演研究[D].长春:吉林大学,2016. Qiu Changkai. One-Dimensional Modeling and Inversion for Time-Domain Airborne Electromagnetic Problems[D]. Changchun:Jilin University, 2016.
[16] 朴化荣.电磁测深法原理[M].北京:地质出版社,1990. Piao Huarong. Principle of Electromagnetic Sounding[M]. Beijing:Geological Publishing House, 1990.
[17] Raiche A P, Spies B R. Coincident-Loop Transient Electromagnetic Master Curves for Interpretation of Two-Layer Earths[J]. Geophysics, 1981, 46(1):53-64.
[18] Spies B R. Depth of Investigation in Electromagnetic Sounding Methods[J]. Geophysics,1989, 54(7):872-888.
[19] Prince A T. The Induction of Electric Currents in Non-Uniform Thin Sheets and Shells[J]. the Quarterly Journal of Mechanics and Applied Mathematics, 1949, 2(3):283-310.
[1] Zeng Zhaofa, Huo Zhijun, Li Wenben, Li Jing, Zhao Xueyu, He Rongqin. 3D Vector Finite-Element Airborne Electromagnetic Modelling in an Arbitrary Anisotropic Medium [J]. Journal of Jilin University(Earth Science Edition), 2018, 48(2): 433-444.
[2] Li Shiwen, Yin Changchun, Weng Aihua. Full-Time Inversion of Time-Domain AEM Data for Resistivity and Magnetic Permeability [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(6): 1830-1836.
[3] Zhu Kaiguang, Li Yue, Meng Yang, Wang Lingqun, Xie Bin, Cheng Yuqi. Application of Minimum Noise Fraction on Noise Removal for Airborne Electromagnetic Data [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(3): 876-883.
[4] Yin Changchun, Qiu Changkai, Liu Yunhe, Cai Jing. Weighted Laterally-Constrained Inversion of Time-Domain Airborne Electromagnetic Data [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(1): 254-261.
[5] Ji Yanju, Feng Xue, Yu Mingmei, Xu Jiang, Hu Yanpu, Guan Shanshan. Conductivity-Depth Identification of HTEM 3D Anomalies Based on Multiple Linear Regression [J]. Journal of Jilin University(Earth Science Edition), 2014, 44(5): 1687-1694.
Full text



No Suggested Reading articles found!