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Land and air transient electromagnetism exploring method based on combined magnetism source technology

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

Active Publication Date: 2014-02-12
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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  • Land and air transient electromagnetism exploring method based on combined magnetism source technology
  • Land and air transient electromagnetism exploring method based on combined magnetism source technology
  • Land and air transient electromagnetism exploring method based on combined magnetism source technology

Examples

Experimental program
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Effect test

Embodiment 1

[0030] There are 4 magnetic sources, all of which are perpendicular magnetic dipole sources with the same parameters. Set the labels of each source as A, B, C, D, such as Figure 8 As shown, the first flight measurement under the excitation of the combined source marked A and C; the second time the flight measurement under the excitation of the combined source marked B and D; the third time the flight measurement marked A, B, C The flight measurement under the excitation of the combined source of D and D finally obtains the measurement data of the three combined sources.

[0031] The drone carries a three-component receiving coil, which is Picture 9 The flight route shown is indicated by 1, 2, 3, and 4 for ease of explanation. During the measurement, the drone first flies on route 1, then flies on route 2 in the opposite direction, and then returns along route 3, and so on. When the route is completed, the measurement of a combined source is completed. Then, return along the ori...

Embodiment 2

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

[0035] The flight path of the drone is the same as in the first embodiment. After the data collection is completed, data processing, inversion and interpretation are carried out according to the work flow of ground-to-air transient electromagnetics.

Embodiment 3

[0037] There are 8 magnetic sources, all of which are perpendicular magnetic dipole sources with the same parameters. Let the labels of each source be A, B, C, D, E, F, G, H, such as Picture 11 As shown, the first flight measurement under the excitation of the combined sources labeled A, C, E, G; the second time the flight measurement under the excitation of the combined sources labeled B, D, F, and H; the third time Perform flight measurements under the excitation of all 8 combined sources, and finally obtain measurement data of three combined sources.

[0038] The flight path of the drone is the same as in the first embodiment. After the data collection is completed, data processing, inversion and interpretation are carried out according to the work flow of ground-to-air transient electromagnetics.

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Abstract

The invention discloses a land and air transient electromagnetism exploring method based on the combined magnetism source technology. The land and air transient electromagnetism exploring technology based on the combined source technology is firstly put forward in the method, specifically, 4 or 6 or 8 magnetism sources are arranged on a large circumference of the ground with the exploration target area as the center at equal intervals, and an unmanned aerial vehicle above the exploration area is used for collecting induced electromotive force transient responses excited by all combinations. Due to the fact that the adopted combination sources are multiple sources and are symmetrically distributed, the problems that the response result range difference, brought by a fixed source between a far-field point and a near-field point is large, and the position of partial asymmetry body is explained uncertainly are greatly solved, the multi-angle observation information of an underground anomalous body can be obtained, the effect of the inversion multiplicity is reduced, and the complex area can be explored in an efficient, high-resolution, large-area and large-depth mode.

Description

Technical field [0001] The invention relates to a ground-to-air transient electromagnetic survey method based on combined source emission and unmanned aerial vehicle reception, and belongs to the category of geophysical electromagnetic survey methods. Background technique: [0002] Transient electromagnetic method is a traditional electromagnetic prospecting method for mineral and water prospecting. It uses a transmitting loop on the ground to supply current pulse signals, and the receiving coil is also arranged on the ground to receive vertical induced electromotive force transient signals. Then according to the observation data inversion and interpretation of the underground electrical structure to achieve the purpose of geological exploration. This method has low work efficiency in areas where the terrain is complex and the ground geophysical prospecting is difficult to construct. Therefore, people think of applying aerial transient electromagnetic survey technology to realiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10G01V3/38
Inventor 毛立峰王绪本
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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