Short-offset grounded-wire TEM method for efficient detection of mined-out areas in vegetation-covered mountainous coalfields

Zhou, Nannan; Xue, Gang; Hou, Dongyang; Hai, Li; Chen, Wei-ying

doi:10.1071/eg15095

Cited by 18 publications

(6 citation statements)

References 14 publications

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“…J 0 denotes the zero-order Bessel function [ 7 ]. G ( λ , t ) is a function of the variable λ and the observation time t ; moreover, it is also related to the resistivity and thickness of the formation and can be obtained using the inverse Laplace transform [ 25 ]. It can be seen from Equation (3) that larger peak value I and shorter falling time t f of the TX current contribute to a higher response amplitude.…”

Section: Detection Principlesmentioning

confidence: 99%

Section: Response Analysismentioning

confidence: 99%

“…The power supply also needs to provide tens of kW of power to ensure a sufficiently large current to excite the magnetic and electric fields due to high earth resistance and long grounded wires [ 23 , 24 ]. Moreover, the combined effects of the transmitter wire and grounding points challenge the simplicity of the secondary response [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Liao,

Xu,

Liu

et al. 2023

Sensors

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This paper proposes a nondestructive, separate transmitter-receiver (TX-RX) electromagnetic measurement system for near-surface detection. Different from the traditional dual-coil integrated design, the proposed transient electromagnetic (TEM) system performs shallow subsurface detection using independent TX coil and movable RX coils. This configuration requires a large primary field so that the far-away secondary field is able to generate reliably induced voltages. To achieve this goal, a bipolar current-pulsed power supply (BCPPS) with a late resonant charging strategy is designed to produce a sufficiently large magnetic moment for the exciting coil with low source interference. The magnetic dipole source (MDS) with a large proportion of weight is separated from the field observation device and does not need to be dragged or transported during the detection process. This setup lowers the weight of the scanning device to 3 kg and greatly improves the measurement efficiency. The results of the laboratory test verify the effectiveness of the separate MDS and RX module system. Field experimental detection further demonstrates that the proposed system can realize highly efficient and shallow surface detection within a 200 m range of the MDS device.

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Section: Detection Principlesmentioning

confidence: 99%

Section: Response Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Liao,

Xu,

Liu

et al. 2023

Sensors

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show abstract

“…In addition, at present, most of the judgments on the target are based on the inversion of gradient class optimization, which requires the interpreter's subjective knowledge. It is impossible to infer the objective solution of the geological target entirely from the data, and it is also impossible to analyse the uncertainty of the solution (Zhou, Xue, Hou, Li, & Chen, ).…”

Section: Research Prospectsmentioning

confidence: 99%

Developments measurements of TEM sounding in China

et al. 2019

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China is facing many challenges in the area of high‐precision exploration for deep mineral resources, and also in environmental and engineering fields. It has become an urgent task to realize geophysical explorations with high precision and high efficiency in complex environments. It has been found that the traditional transient electromagnetic method (TEM) had a series of problems related to theory, method, and instrument, as well as data interpretation. Based on the reviews of present TEM achievements, three new improved measurements are introduced. The central‐loop system was improved by a large fixed‐loop system; the long‐offset system was changed to the short‐offset one; the resistivity profile was transformed into a virtual wave‐field profile. Finally, this paper points out that the future research direction of the TEM method is in terms of equipment, data processing, and big data information.

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“…The detection depth of this method can reach approximately 2,000 m. Compared with traditional LOTEM methods, the short-offset grounded-wire TEM (SOTEM) method can produce a higher signal-to-noise ratio and achieve higher detection precision at shallow depth (<2,000 m). In recent years, many research achievements have been realized with this method, and excellent deep exploration results have been obtained in the fields of mineral deposits and hydrogeological prospecting (Chen, Xue, & Khan, 2016;Xue et al, 2013Xue et al, , 2020Xue, Chen, & Cheng, 2019;Zhou, Xue, Hou, Li, & Chen, 2017;Zhou, Xue, Hou, & Lu, 2018;Zhou, Xue, & Li, 2016).…”

mentioning

confidence: 99%

Exploration of lead‐zinc deposits using electromagnetic method: A case study in Fengtai ore deposits in Western China

et al. 2021

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The Fengtai Pb-Zn metallogenic deposits located in China's western region have good minerogenetic conditions and exploration potential. However, the Fengtai mining area passed through complex orogenic process zones, such as subduction, collision, and integration between the Yangtze Plate and the North China Plate. Existing geological research and drilling results showed that the ore bodies of large-scale Pb-Zn deposits in the ore-gathering area were steeply inclined, and the detection depths of the majority of the metal deposits were generally less than 300 m. Deep orecontrolling structures at approximately 500-1,000 m are not well understood. Therefore, high-precision and large-depth geophysical detection techniques are necessary to achieve the required accurate detection results. This study revealed that the resistivity values of the ore and host rocks were quite different, which is essential for effective and efficient geophysical prospecting. Based on the petrophysical result, the grounded-wire transient electromagnetic method system has been found to be one of the better choices for the deep prospecting of the metal deposits and was applied to detect Pb-Zn deposits in the Bafangshan-Erlihe area. First, the groundedwire transient electromagnetic method's effectiveness was verified using results from survey line 1 at a known ore deposit verified by the drilling result. Then, the technique was used to identify deposits in an unexplored area. A deep anticline and ore body were successfully imaged. Most lead-zinc ore bodies are controlled by the hinge and two wings of the tight anticline, and distributed in the contact zone between limestone and phyllite. The results provide a critical basis for deep prospecting and drilling design.

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Short-offset grounded-wire TEM method for efficient detection of mined-out areas in vegetation-covered mountainous coalfields

Cited by 18 publications

References 14 publications

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Developments measurements of TEM sounding in China

Exploration of lead‐zinc deposits using electromagnetic method: A case study in Fengtai ore deposits in Western China

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