Multi-source semi-airborne TEM is a supplement and development of electric source semi-airborne TEM. It has characteristics of great detective depth, strong adaptability in complex topography and high working efficiency. Based on the one-dimensional forward algorithm, the author analyzed the full-component response of parallel source and multi-source and single-source models. The results show that the curve of vertical component z is the simplest and it can be significantly strengthened with multi-source, which means this component is the most suitable one for data processing and interpretation. The most complex component is x. The curve always shows sign-changing in full field, but the magnitude can be strengthened in late stage. As the horizontal component y is most affected by current direction and receiver location, the curve shape and magnitude change are both complicated. Combined with the response characteristics of magnitude variation versus offset, it is suggested that the working area should be within the range of 5~6 times of source length. The research results in this paper can provide a reference for technical support to its application and obtain a preliminary understanding of the method.
Ying-Ying ZHANG. An analysis of full-component response of multi-source semi-airborne TEM method[J]. Geophysical and Geochemical Exploration,
2021, 45(1): 102-113.
Schematic diagram of an electric dipole on the surface of layered earth (a) and coordinatesketch of multi-source subdivision(b)
Top view of parallel sources and survey lines
Multi-component responses of parallel sources on survey line y=0 m
Multi-component responses of parallel sources on survey line y=-300 m
Multi-component responses of parallel sources on survey line y=-1000 m
Top view of angled sources and survey lines
Multi-component responses of angled sources on survey line y=0 m
Multi-component responses of angled sources on survey line y=-1 000 m
Multi-component responses at different offsets
[1]
Nabighian N M. Electromagnetic methods in applied geophysics-theory(volume 1)[M]. Tulsa OK: Society of exploration, 1988.
[2]
Mogi T, Kusunoki K, Kaieda H, et al. Grounded electrical-source airborne transient electromagnetic (GREATEM) survey of mount Bandai, north-eastern Japan[J]. Exploration Geophysics, 2009,40:1-7.
[3]
Allah S A, Ito H, Mogi T, et al. Three-dimensional resistivity characterization of a coastal area: Application of grounded electrical-source airborne transient electromagnetic (GREATEM) survey data from Kujukuri beach, Japan[J]. Journal of Applied Geophysics, 2013,99(3):1-11.
[4]
Ito H, Mogi T, Jomori A, et al. Further investigation of underground resistivity structures in coastal areas using grounded-source airborne electromagnetics[J]. Earth Planets & Space, 2011,63(8):e9-e12.
[5]
Ito H, Kaieda H, Mogi T, et al. Grounded electrical-source airborne transient electromagnetics (GREATEM) survey of Aso Volcano, Japan[J]. Exploration Geophysics, 2013,44:A-D.
Ji Y J, Wang Y, Xu J, et al. Development and application of the grounded long wire source airborne electromagnetic exploration system based on unmanned airship[J]. Chinese Journal of Geophysics, 2013,56(11):3640-3650.
Li S Y, Lin J, Yang G H, et al. Ground-airborne electromagnetic signals de-noising using a combined wavelet transform algorithm[J]. Chinese Journal of Geophysics, 2013,56(9):3145-3152.
Fang T, Zhang J J, Fu C Q, et al. Using ground-airborne transient electromagnetic system on unmanned aerial vehicle detecting Yeshan underground tunnels[J]. Progress in Geophysics, 2015,30(5):2366-2372.
[9]
刘金鹏. 电性源地空瞬变电磁法在采空区探测中的应用[D]. 西安:长安大学, 2018.
[9]
Liu J P. The application of ground-airborne transient electromagnetic method with electric source in the gobs detection[D]. Xi’an: Chang’an University, 2018.
Wu Q L. Semi-Airborne transient electromagnetic apparent resistivity imaging and its application in tunnel survey in complex terrain areas[D]. Jinan: Shandong University, 2019.
[11]
刘天佑. 地球物理勘探概论[M]. 北京: 地质出版社, 2007.
[11]
Liu T Y. Introduction to geophysical exploration[M]. Beijing: Geological Publishing House, 2007.
[12]
Kaufman A A, Keller G V. 频率域和时间域电磁测深[M].王建谋,译. 北京: 地质出版社, 1987.
[12]
Kaufman A A, Keller G V. Electromagnetic sounding in frequency and time domain[M].Wang J M. Beijing: Geological Publishing House, 1987.
[13]
Um E S. On the physics of galvanic source electromagnetic geophysical methods for terrestrial and marine exploration[D]. Madison:University of Wisconsin-Madison, 2005.
[14]
Mogi T, Tanaka Y, Kusunoki K, et al. Development of grounded electrical source airborne EM(GREATEM)[J]. Exploration Geophysics, 1998,29:61-64.
Liu F B, Li J T, Liu L H, et al. Development and application of a new semi-airborne transient electromagnetic system with UAV platform[J]. Progress in Geophysics, 2017,32(5):2222-2229.
[16]
吴寿勇. 半航空电磁勘查系统数据采集关键技术研究[D]. 成都:成都理工大学, 2014.
[16]
Wu S Y. Research of data acquisition key technologies of half aviation electromagnetic exploration system[D]. Chengdu:Chengdu University of Technology, 2014.
[17]
李琳琳. 半航空瞬变电磁发射机关键技术研究[D]. 成都:成都理工大学, 2015.
[17]
Li L L. Study on the key technology of the GREATEM transmitter[D]. Chengdu:Chengdu University of Technology, 2015.
[18]
王金梅. 无人机半航空瞬变电磁信号接收技术研究[D]. 成都:成都理工大学, 2018.
[18]
Wang J M. The research on receiving technology of semi-airborne transient electromagnetic receiver[D]. Chengdu: Chengdu University of Technology, 2018.
Zhang Y Y. Study on multi-component interpretation and full field apparent resistivity definition of semi-airborne transient electromagnetic method with electrical dipole on the surface[D]. Xi’an: Chang’an University, 2013.
Zhang Y Y, Li X, Yao W H, et al. Multi-component full field apparent resistivity definition of multi-source ground-airborne transient electromagnetic method with galvanic sources[J]. Chinese Journal of Geophysics, 2015,58(8):2745-2758.
[23]
宿传玺. 浅层岩溶半航空瞬变电磁响应规律与试验研究[D]. 济南:山东大学, 2018.
[23]
Su C X. Responses and experimental studies of semi-airborne transient electromagnetic for shallow karst[D]. Jinan: Shandong University, 2018.
[24]
曹凤凤. 地空瞬变电磁起伏地形效应的特征研究[D]. 西安:长安大学, 2019.
[24]
Cao F F. Study on characteristics of rugged terrain effect of ground-airborne transient electromagnetic[D]. Xi’an: Chang’an University, 2019.
Li X, Zhang Y Y, Lu X S, et al. Inverse synthetic aperture imaging of ground-airborne transient electromagnetic method with a galvanic source[J]. Chinese Journal of Geophysics, 2015,58(1):277-288.
[26]
张莹莹. 地空瞬变电磁逆合成孔径成像方法研究[D]. 西安:长安大学, 2016.
[26]
Zhang Y Y. Study on inverse synthetic aperture imaging of ground-airborne transient electromagnetic method[D]. Xi’an: Chang’an University, 2016.
Zhang Y Y, Li X, Li J, et al. Fast imaging technique of multi-source ground-airborne transient electromagnetic method[J]. Progress in Geophysics, 2016,31(2):869-876.
[28]
吕仁斌. 半航空瞬变电磁数据处理及快速成像方法研究[D]. 成都:成都理工大学, 2017.
[28]
Lyu R B. Research on rapid simulation and data processing of semi-aerial transient electromagnetic[D]. Chengdu: Chengdu University of Technology, 2017.
Ji Y J, Xu J, Wu Q, et al. Apparent resistivity inversion of electrical source semi-airborne electromagnetic data based on neutral network[J]. Chinese Journal of Radio Science, 2014,29(5):973-980.
[30]
徐江. 基于人工神经网络电性源半航空视电阻率反演方法研究[D]. 长春:吉林大学, 2014.
[30]
Xu J. Apparent resisitivity inversion research of electrical-source of semi-airborne transient electromagnetic based on neutral network method[D]. Changchun: Jilin University, 2014.
[31]
许洋. 半航空一维正反演研究[D]. 成都:成都理工大学, 2014.
[31]
Xu Y. Study about 1D forward and inversion of SATEM[D]. Chengdu: Chengdu University of Technology, 2014.
[32]
李佳. 多辐射场源地空瞬变电磁一维反演方法研究[D]. 西安:长安大学, 2017.
[32]
Li J. Study on 1D inversion of multi-source grounded-airborne transient electromagnetic method[D]. Xi’an: Chang’an University, 2017.
Zhao H, Jing X, Li X, et al. A study of 1D inversion of multi-source ground-airborne transient electromagnetic method[J]. Geophysical and Geochemical Exploration, 2019,43(1):132-142.
Zhang P, Yu X D, Xu Y, et al. An adaptive regularized inversion of 1D semi-airborne time-domain electromagnetic data[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2017,39(1):1-8.
[35]
Abdallah S, Mogi T, Kim H J. Three-dimensional inversion of GREATEM data:Application to GREATEM survey data from Kujukuri Beach,Japan[J]. Applied Earth Observations and Remote Sensing, 2017,99:1-7.
[36]
Guptasarma D, Singh B. New digital linear filters for Hankel J0 and J1 transforms[J]. Geophysical Prospecting, 1997,45:745-762.
Wang H J. Digital filter algorithm of the sine and cosine transform[J]. Chinese Journal of Engineering Geophysics, 2004,1(4):329-335.
[38]
Mogi T, Tanaka Y, Kusunoki K, et al. Development of grounded electrical source airborne transient EM (GREATEM)[J]. Exploration Geophysics, 1998,29:61-64.
