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Ground-space transient electromagnetic survey method based on combined magnetic source technology

A transient electromagnetic and magnetic source technology, applied in the field of geophysical electromagnetic exploration, can solve problems such as the inability to achieve high-efficiency, high-resolution, large-area and large-depth exploration in complex areas, and achieve low work efficiency, large workload, and increased The effect of exploration depth

Active Publication Date: 2016-12-07
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that none of the existing transient electromagnetic survey methods can achieve high-efficiency, high-resolution, large-area and deep-depth exploration in complex areas

Method used

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  • Ground-space transient electromagnetic survey method based on combined magnetic source technology
  • Ground-space transient electromagnetic survey method based on combined magnetic source technology
  • Ground-space transient electromagnetic survey method based on combined magnetic source technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] There are 4 magnetic sources, all of which are vertical magnetic dipole sources with the same parameters, and the labels of each source are set as A, B, C, and D in turn, such as Figure 8As shown, the flight measurement under the excitation of the combined source marked as A and C is carried out for the first time; the flight measurement under the excitation of the combined source marked as B and D is carried out for the second time; the flight measurement is carried out for the third time marked as A, B and C , D's combined source excitation flight measurement, and finally get the measurement data of the three combined sources.

[0031] The UAV carries a three-component receiving coil, and it flies along the sky over the survey target area Figure 9 The flight route shown is marked as 1, 2, 3, and 4 for the convenience of explanation. When measuring, the UAV first flies route 1, then flies route 2 in the opposite direction, and then returns along route 3, and so on. ...

Embodiment 2

[0034] There are 6 magnetic sources, all of which are vertical magnetic dipole sources with the same parameters, and the labels of each source are set as A, B, C, D, E, and F in turn, such as Figure 10 As shown, the first flight measurement under the excitation of the combined source marked A, C, E; the second time the flight measurement under the excitation of the combined source marked B, D, F; the third time marked A , B, C, D, E, F under the excitation of the combined source flight measurement, and finally get the measurement data of the three combined sources.

[0035] The flight route of the unmanned aerial vehicle is identical with embodiment 1. After the data collection is completed, data processing, inversion interpretation and other work are carried out according to the workflow of ground-space transient electromagnetic.

Embodiment 3

[0037] There are 8 magnetic sources, all of which are vertical magnetic dipole sources with the same parameters, and the labels of each source are set as A, B, C, D, E, F, G, and H in turn, such as Figure 11 As shown, the first flight measurement under the excitation of the combined source marked as A, C, E, G; the second time the flight measurement under the excitation of the combined source marked as B, D, F, H; the third time The flight measurements under the excitation of all 8 combined sources are carried out, and finally the measurement data of the three combined sources are obtained.

[0038] The flight route of the unmanned aerial vehicle is identical with embodiment 1. After the data collection is completed, data processing, inversion interpretation and other work are carried out according to the workflow of ground-space transient electromagnetic.

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Abstract

The invention discloses a ground-air transient electromagnetic prospecting method based on combined magnetic source technology. The method proposes the ground-space transient electromagnetic prospecting technology based on combined source technology for the first time, specifically on the ground centered on the prospecting target area. Arrange 4, 6 or 8 magnetic sources at equal intervals on a large circle, and use a drone to collect the transient response of the induced electromotive force excited by each combined source over the exploration area. Since the combined source adopted by the present invention is multi-source and distributed symmetrically, the problems of large difference in the response result amplitude of the near and far field points and uncertain position interpretation of local inhomogeneous bodies caused by the use of fixed sources are greatly reduced. , can obtain multi-angle observation information about underground anomalies, reduce the influence of multi-solution inversion, and realize high-efficiency, high-resolution, large-area and large-depth exploration in complex areas.

Description

technical field [0001] The invention relates to a ground-air transient electromagnetic prospecting method based on combined source emission and UAV reception, belonging to the category of geophysical electromagnetic prospecting methods. Background technique: [0002] The transient electromagnetic method is a traditional electromagnetic prospecting method for ore and water exploration. The transmitting loop is arranged on the ground to supply the current pulse signal, and the receiving coil is also arranged on the ground to receive the vertically induced electromotive force transient signal. Then, according to the observation data, the underground electrical structure is inverted and interpreted to achieve the purpose of geological exploration. This method has low work efficiency and even cannot work in areas with complex terrain and difficult ground geophysical prospecting. Therefore, people thought of applying airborne transient electromagnetic survey technology to realize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10G01V3/38
Inventor 王绪本毛立峰高嵩李琳琳覃庆炎
Owner CHENGDU UNIVERSITY OF TECHNOLOGY