Deep sounding TEM investigation method based on a modified fixed central-loop system

Xue, Gang; Bai, Chao-ying; Yan, Shu; Greenhalgh, Stewart; Li, Meifang; Zhou, Nannan

doi:10.1016/j.jappgeo.2011.10.007

Cited by 60 publications

(19 citation statements)

References 20 publications

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“…For the large-fixed loop source given in Figure 4, the four sides of the loop are named A, B, C, and D, respectively, its dimensions are 2a and 2b in the X and Y directions, Receiver (x R , y R ) located inside the transmitter loop. The total vertical component contribution Hz is the sum of each side [27]:…”

Section: Theory Of Large-loop Temmentioning

confidence: 99%

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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The water-enriched mined-out area, which led to frequent accidents and the serious destruction of ecological environment and serious threat to coal-mining practices. To ensure safe mining practices and to avoid the intrusion of water from the bases of coal deposits, the detection of the mined-out areas, especially the water-filled mined-out area in advanced, is one of the most important issues. This research focuses on detecting mined-out area enriched by water with the large-loop transient electromagnetic method. Data acquisition system was arranged along 23 survey lines, and the total of 1975 survey points were recorded. An inversion technique was used to interpret the TEM data. The inversion results suggested that the mined-out areas enriched by water always exhibit a very low-resistivity, the resistivity contour present closed circle sharp. There are three main water enriched mined-out areas, named JS1, JS2, and JS3 in the north part of the survey area, as well as three main water weak-enriched areas named RJS1, RJS2 and RJS3 in the west and southwest part of the survey area can be inferred by TEM, the interpretation results were verified by drilling. Large loop TEM is proved as an efficient way to investigate water enriched mined-out areas under the rugged topography conditions, and this work provides more detailed geological information to the coal mining enterprise for further coal-mining practices safety arrangement.

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Section: Theory Of Large-loop Temmentioning

confidence: 99%

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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“…The transient electromagnetic method (TEM) is widely used in groundwater and environmental investigations, as well as being an exploration tool for mineral resources [1] . It is based on the principle of electromagnetic induction, in which, a transmitter loop on the ground surface is energized by short pulses of direct current.…”

Section: Introductionmentioning

confidence: 99%

A Novel Technique for Synthetic Source of Multiple Electromagnetic Data Sets*

Rao¹,

Wu²,

Guo³

et al. 2016

Proceedings of the 7th International Conference on Environment and Engineering Geophysics &Amp; Summit Forum of Chinese Academy

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Abstract-A novel technique for synthetic source of multiple electromagnetic data sets is presented. The technique applies weighting to multiple transmitters of small magnetic moment loops to form a synthetic source for deep deposits exploration in complex terrain. In order to determine the weighting coefficient, a dipole model is employed to consider the coupling between the target and each transmitter and receiver. By assuming the possible orientation and location of the target, a look-up table of transmitting and receiving coupling coefficient is established to search for the approximate location and orientation of the target. Once the location and orientation of the target is decided through the matching process, a composite transmitter can be formed by summing the single transmitter data using weights calculated based on the coupling between the target and the transmitters, then the response from that target will be maximally enhanced.

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“…The field equations of the rectangular loop are derived as the integral of the corresponding component of electric dipole (RAICHE and SPIES 1981;PODDAR 1982PODDAR , 1983RAICHE 1987;XUE et al 2012). Recent study (ZHOU and XUE 2014) illustrates that the rectangle loop source generates only the currentcarrying wire (TE), since the grounding ends (TE-TM) from each electric dipole could be ignored.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Different-Mode Fields Generated from Grounded-Wire Source Based on the 1D Model

Zhou

Xue

et al. 2015

Pure Appl. Geophys.

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Abstracts-Traditional TEM study mainly focuses on the generation and application of the TE field using a loop or grounded-wire source; but in recent decades, lots of efforts have been made for implementation of the TM field and even the integration of the TE field with the TM one into anomaly detection in the subsurface. However, no applicable principles have been proposed for selecting the optimal electromagnetic field for various subsurface targets. The transient electromagnetic (TEM) fields generated from grounded-wire source consist of the TE-mode response (current-carrying wire), the TE-TM mode response (grounding ends) and the combined TEM-mode response (currentcarrying wire and grounding ends). This study performs a comparison of TE/TE-TM/TEM fields by generating them from grounded-wire source and testing their distribution characteristics, detection depth, and sensitivity to anomalies, using both synthetic 1D model and two field surveys in China. The comparisons demonstrate that, the detection depth of the TE-TM field is smaller than those of both the TE and combined TEM fields. Meanwhile, for electric field, the TE-TM response provides a better detection than the TEM one, but with an uneven distribution. Therefore, the TE-TM electric field requires well-designed arrangements of receiving positions when applied to real projects. For the magnetic field, the TEM response has the best detection capability compared to the TE and TE-TM ones, but is least sensitive to layer thickness and resistivity, especially for an embedded layer with low resistivity.

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Deep sounding TEM investigation method based on a modified fixed central-loop system

Cited by 60 publications

References 20 publications

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

A Novel Technique for Synthetic Source of Multiple Electromagnetic Data Sets*

A Comparison of Different-Mode Fields Generated from Grounded-Wire Source Based on the 1D Model

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