New methods of controlled-source electromagnetic detection in China

Di, Qingyun; Xue, Guangtao; Yin, Changchun; Xiu, Li

doi:10.1007/s11430-019-9583-9

Cited by 53 publications

(12 citation statements)

References 17 publications

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“…Electromagnetic exploration is undertaken based on the differences in electromagnetic properties between various types of rocks and ores. By observing and analyzing the variations and distribution of electromagnetic signals in time and space, different types of useful deposits can be found (Di et al, 2019(Di et al, , 2020. The electromagnetic methods in use include magnetotelluric (MT); audio frequency magnetotelluric; controlled source audio frequency magnetotelluric (CSAMT); transient electromagnetic (TEM); wide area electromagnetic (WFEM); pseudo-random electromagnetic; ground-penetrating radar; and low frequency electromagnetic.…”

Section: Detection Methods For the Ore Concentration Areamentioning

confidence: 99%

Summary of technology for a comprehensive geophysical exploration of gold mine in North China Craton

Xue

Lei

et al. 2021

Sci. China Earth Sci.

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The North China Craton is the oldest continental block, and has suffered from large-scale lithospheric thinning and destruction, which in turn led to gold deposits in northern China. The decratonic gold deposits in the North China Craton became the most important gold deposits in China, and geophysical methods are key means to detect and discover gold deposits there. In this paper, based on the geological and petrophysical characteristics of the North China Craton, the geological model of the decratonic gold deposits is transformed into a geophysical model. At present, two methods of geophysical exploration of decratonic gold deposits are in use: rapid and efficient exploration on the scale of the ore concentration area, and large depth exploration on the scale of the deposit area. In detail, the airborne electromagnetic, magnetic and gravity methods are used to detect the shallow (1,500 m) anomaly area on the scale of the ore concentration area. Through the ground-controlled source electromagnetic and ground magnetotelluric methods, explorations for targets at significant depth (5,000 m) are carried out in the mining area. Then, taking the Liaodong ore concentration area as an example, geophysical methods are used to discover two prospecting areas around the Jianshanzi Fault in the Qingchengzi ore concentration area, Baiyun-Xiaotongjiapuzi deep prospecting area, and Qingchengzi deep prospecting area. Next, three prospecting areas are delineated around the Jixingou Fault in the Wulong mining area, Wulong deep prospecting area, Weishagou deep prospecting area, and Chang'an deep prospecting area. The anomalies in the ore concentration area and mining area are revealed by means of three-dimensional exploration methods, thereby providing technical support for the exploration of metal minerals such as decratonic gold deposits.

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Section: Detection Methods For the Ore Concentration Areamentioning

confidence: 99%

Summary of technology for a comprehensive geophysical exploration of gold mine in North China Craton

Xue

Lei

et al. 2021

Sci. China Earth Sci.

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“…We can obtain the underground electrical structure information by analyzing the spatial and temporal distribution characteristics of the secondary field [1]. Now, the transient electromagnetic method has been widely used in mineral resource exploration, gob detection, hydrogeological survey, engineering and environmental exploration due to its low cost and high efficiency [2].…”

Section: Introductionmentioning

confidence: 99%

3D Inversion of Grounded-source Transient Electromagnetic Data

Qi,

Li,

et al. 2023

J. Phys.: Conf. Ser.

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The grounded-source transient electromagnetic method has the characteristics of convenient installation of emission source and large emission power, and is being widely used. To get a fine interpretation of observation data, we introduce a three-dimensional inversion algorithm for the grounded-source transient electromagnetic data. Firstly, the unstructured time-domain finite-element method is used to calculate the electromagnetic response, and then the quasi Newton method is used for data inversion. Finally, the reliability of this algorithm is verified by applying it to the theoretical model.

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“…The actual depth of investigation of the CSAMT method depends on the resistivity structure of the survey area (for the geological environment of China, the depth of investigation of the CSAMT method is usually <1.5 km). With the gradual depletion of shallow resources, demand has become increasingly high for exploration methods with larger depth of investigation [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Insight into skywave theory and breakthrough applications in resource exploration

Xue

et al. 2021

National Science Review

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Skywave refers to the electromagnetic wave reflected or refracted from the ionosphere and propagate in the form of a guided wave between the ionosphere and the Earth's surface. Since the skywave can propagate over large distances, it has been widely used in long-distance communication. This paper explores and demonstrates the feasibility of skywave for deep resource and energy exploration at depths up to 10 km. Theoretical and technical advancements were accomplished in furthering the skywave applications. A new solution method based on Green's function has been developed to study skywave propagation in a fully coupled lithosphere-air-ionosphere full space model. The model allows one, for the first time, to study skywave distribution characteristics in the lithosphere containing inhomogeneity such as ore deposits or oil and gas reservoirs. This model also lays a foundation for skywave data processing and interpretation. On a parallel line, we have developed a multi-channel, broadband, low-noise, portable data acquisition system suitable for receiving skywave signals. Using the skywave field excited by a high-power fixed source located in the central China, actual field surveys have been carried out in some areas in China including the Biyang depression of Henan Province. The initial results appear encouraging – The interpreted resistivity models prove to be consistent with those of seismic exploration and known geological information, and the exploration cost is only about 1/4 to 1/10 of seismic surveys. These initial successful applications of the skywave theory lay a solid foundation for further verification of the new method.

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New methods of controlled-source electromagnetic detection in China

Cited by 53 publications

References 17 publications

Summary of technology for a comprehensive geophysical exploration of gold mine in North China Craton

Summary of technology for a comprehensive geophysical exploration of gold mine in North China Craton

3D Inversion of Grounded-source Transient Electromagnetic Data

Insight into skywave theory and breakthrough applications in resource exploration

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