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High-density electrical proximal dipole electromagnetic sounding method

A high-density electric method and electromagnetic sounding technology, which is applied in electric/magnetic exploration, radio wave measurement system, measurement device, etc., can solve problems such as low work efficiency, near-source effect, weak signal strength, etc., and improve work efficiency. Efficiency, improving diversity, and improving the effect of anti-interference ability

Inactive Publication Date: 2016-08-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: weak signal strength, easy to produce near-source effect; low work efficiency
[0012] The disadvantage of the existing high-density electrical measurement is that due to the limited conditions of the measured area, it is difficult to measure the depth below 100 meters. The depth below 100 meters is usually solved by transient electromagnetic method or magnetotelluric sounding method.
As far as the transient electromagnetic method is concerned, it is sometimes difficult to achieve near-end measurement due to the limitation of the transceiver distance
The existing high-density electrical method cannot perform near-end dipole electromagnetic sounding, and there is no literature report on the high-density electrical method for proximal dipole electromagnetic sounding

Method used

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  • High-density electrical proximal dipole electromagnetic sounding method
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  • High-density electrical proximal dipole electromagnetic sounding method

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The high-density electrical method proximal dipole electromagnetic sounding method was used in the site selection and survey of the backup water source in Tonghua City; Water-conducting karst caves for water storage and geological problems that affect the stability of the dam body provide geological basis for the construction of the reservoir.

[0051] The strata in the reservoir area belong to the Badaojiang Formation (Z 2 b ): stratified limestone, light-colored clastic limestone; Quaternary (Q p 4) The coverage is relatively shallow, generally 3 to 5 meters. The average resistivity of geological and electrical characteristics in the reservoir area is 1000-6000Ω.m. adopted as figure 2 The Y-shaped high-density large-line wiring method shown verifies the known scale of fractures and ascertains unknown hidden structures. The proposed exploration depth is over 1500 meters.

[0052] First, lay out high-density large wires, power supply electrodes, and receiving elec...

Embodiment 2

[0073] Groundwater detection in a mining area in Jilin: The purpose is to find out the occurrence, nature and possibility of water inrush of hidden faults in the mining area, whether there are water-conducting karst caves and stable geological problems that affect the water storage in the mining area, and provide geological basis for the construction of the mining area.

[0074] The strata in the mining area belong to the Cretaceous Dalazi Formation (K 1 d) Yellow grainy sandstone with purple sandstone and siltstone; Quaternary (Q 4 ) coverage is relatively shallow, generally 3 to 5 meters. The characteristic resistivity of the mining area is 1100~6500Ω.m. adopted as figure 2 The Y-shaped high-density large-line wiring method shown is to verify the known scale of the fracture and ascertain the unknown hidden structure9. The proposed exploration depth is >1600 meters.

[0075] First, lay out high-density large wires, power supply electrodes, and receiving electrodes in a Y-...

Embodiment 3

[0097] A mining area in Siping has applied the high-density electrical method proximal dipole electromagnetic sounding method; the purpose is to find out the occurrence, nature and possibility of leakage of hidden faults in the mining area, and whether there are geological problems that affect the stability of the mining area. Provide geological evidence.

[0098] The mining area belongs to the Ordovician Shisu Formation (O 3 S ) strata: marine intermediate-acid volcanic rock, clastic rock, limestone; Quaternary (Q 4 ) coverage is relatively shallow, generally 2 to 4 meters. The average characteristic resistivity of the mining area is 1000-6000Ω.m. adopted as figure 2The Y-shaped high-density large-line wiring method shown verifies the known scale of fractures and ascertains unknown hidden structures. The proposed exploration depth is >1500 meters.

[0099] First, lay out high-density large wires, power supply electrodes, and receiving electrodes in a Y-shape, and connec...

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Abstract

The invention relates to a high-density electrical method near-end dipole electromagnetic sounding method. According to the method, three high-density jug lines are arranged in a sounding area in a Y mode, a sounding line I, a sounding line II and a sounding line III are arranged with the center of the sounding area as a circle center in an equal-angle mode, all electrodes on the sounding lines serve as a receiving electrode M and a receiving electrode N, and a current electrode A and a current electrode B are arranged in the middle of the three high-density jug lines arranged in the Y mode. By means of the method, a high-density electrical method can be applied to great-depth exploration, and the defect that an electromagnetic method is low in shallow-portion exploration precision is overcome; the electrodes are arranged at a time and receive signals continuously through program control without manual electrode changing; the variety and field adaptability of a high-density electrical method are greatly improved because pseudo-random signals or white Gaussian noise is adopted to serve as basic mixed shaping signals to form an emission source and mixed code emission is adopted. Continues sounding on one sounding line can be achieved through the electromagnetic method, and electromagnetic exploration efficiency is greatly improved. High-density electrical method near-end dipole electromagnetic sounding is achieved.

Description

technical field [0001] The invention relates to a high-density electrical exploration method, in particular to a high-density electrical proximal dipole electromagnetic sounding method. Background technique: [0002] Electrical prospecting is an important part of geophysical prospecting. Electrical prospecting mainly includes three parts: direct current method, alternating current method and electromagnetic method. They belong to time domain, frequency domain and alternating electromagnetic method respectively. Many different measuring instruments are produced in each branch of electrical prospecting, and different measuring methods are used for different prospecting purposes. [0003] High-density electrical surveying was produced in the 1970s and 1980s. It is a geoelectric prospecting method derived from the direct current method combined with program-controlled technology and disk storage technology. In recent years, a "high-density electrical method" measurement system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/00
Inventor 刘立家凌若飞朱士
Owner JILIN UNIV
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