CN103809203B - Outdoor detection working method resolving electromagnetic interference - Google Patents
Outdoor detection working method resolving electromagnetic interference Download PDFInfo
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- CN103809203B CN103809203B CN201210438937.8A CN201210438937A CN103809203B CN 103809203 B CN103809203 B CN 103809203B CN 201210438937 A CN201210438937 A CN 201210438937A CN 103809203 B CN103809203 B CN 103809203B
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Abstract
Provided is an outdoor detection working method resolving electromagnetic interference. The invention belongs to an outdoor working method in the field geophysical exploration and specifically relates to a working method for overcoming electromagnetic interference caused by a high-voltage transmission line for an audio magnetotelluric method in outdoor actual operation so as to increase a signal-to-noise ratio and improve the quality of acquired original data. The working method comprises following steps of: (1) setting a reference station at a position 10 km far from a measuring point, and placing an instrument to measure an original magnetic field signal and an original electric field signal of a natural electromagnetic field; (2) placing N-2 (N is more than or equal to 3) electric track acquisition stations at a measuring point near a high-voltage transmission line in order to acquire an electric field signal of the measuring point; (3) placing an electric track acquisition station at a measuring point 300m vertically far from the high-voltage transmission line in order to acquire a magnetic field signal and an electric field signal; (4) turning on instruments at the N-1 measuring points in the steps (2) and (3) in order to perform measurement; (5) recording and saving acquired time series data; and (6) processing the time series data in order to acquire apparent resistivity and impedance phase data.
Description
Technical field：
The invention belongs to the outdoor operation method of field of geophysical exploration is and in particular to a kind of is audio-frequency magnetotelluric magnetic method
Overcoming the electromagnetic interference that high voltage transmission line causes in the wild in real work, thus strengthening signal to noise ratio, improving the original number obtaining
Method of work according to quality.
Background technology：
Audiomagnetotelluric sounding method is to be led for it with country rock in the earth's crust with the electric conductivity of objective body and the difference of magnetic conductivity
The geophysics premise wanted, studies electromagnetic field in space, the temporal regularity of distribution, by collection according to electromagnetic induction principle
The electromagnetic signal of 1～10000Hz in natural field, thus obtaining the subsurface rock resistivity regularity of distribution, distinguishes underground country rock and mesh
Standard type, or a kind of geophysical exploration method the problems such as solution geological structure.With respect to magnetotelluric sounding method（MT）, it
Depth of exploration shallow, be typically usually used in detecting more than 1000 meters of geological structure problem, fruitful to resource exploration.With direct current
Resistivity method is compared, have the advantages that device is light, high working efficiency, be not required to manually to power, exploration cost is low, depth is big, especially
It is to have not by resistive formation shielding and have higher resolution capability to low resistivity layer.So since the seventies, the method is more and more
Paid attention to by various countries' geophysical work person, in geophysical exploration work, played more and more important effect.
Generally, it is all electric field signal and the field signal simultaneously gathering on measuring point when audio magnetotelluric method instrument works in the wild
As shown in Figure 1, the frequency range of collection is about 1～10000Hz, and the frequency range of different instrument collections is slightly different.?
In this signal frequency range of audio magnetotelluric method instrument collection, it is very easy to be affected by artificial disturbance, especially commercial power
Impact.However, with the day by day expansion of scientific and technological progress and human activity scope, even mountain area also tend to exist stronger
Humane interference, particularly 10,000 volts, 3.5 ten thousand volts, the ultra-high-tension power transmission line such as 11 Wan Fu, disturb very serious to natural electromagnetic signal.
Have impact on the quality of data of 50Hz and its frequency range again, even resulting in the data in the collection of high-voltage line near zone when serious cannot make
With.At present, electromagnetic apparatus most advanced and ripe in the world, even if inside has been integrated with soft, the sunken power frequency skill of hard both sides
Art, the such as instrument and equipment such as V8 multi-functional electric device, EH4 conductivity meter, also cannot overcome and bring near high-voltage line in work
Interference problem.Therefore, in order to obtain high-quality initial data, research audio-frequency magnetotelluric magnetic method anti-high-voltage line perturbation technique is very
Necessary.
Content of the invention：
The technical problem to be solved in the present invention is to provide electromagnetic interference in a kind of solution audiomagnetotelluric sounding method work
Method of work, comprehensive analysis high voltage transmission line produce interference the reason and traditional anti-interference method, using audio-frequency magnetotelluric
When magnetograph works near high-voltage line, the signal of telecommunication separates acquisition technique with magnetic signal, uses cooperatively remote reference technique solution simultaneously
The certainly impact to audio-frequency magnetotelluric magnetic method for the high voltage transmission line.
In order to realize this purpose, the technical scheme is that a kind of field detection work side solving electromagnetic interference
Method, comprises the following steps：
（1）At measuring point about 10km arrange a reference station, place 1 apparatus measures Natural electromagnetic field original
Field signal and electric field signal；
（2）N-2 is placed on the measuring point near high-voltage line（N≥3）Tai electricity road acquisition station gathers the electric field signal at this point；
（3）At vertical dimension high voltage transmission line about 300m measuring point place a magnetic track acquisition station, collection field signal and
Electric field signal；
（4）Lay step（2）And step（3）In N-1 measuring point on instrument and equipment after, this N-1 platform instrument is put
In working condition；After reference station device power-up, opening steps（2）And step（3）In N-1 measuring point on instrument and equipment carry out
Measurement；
（5）After all appts complete acquisition tasks, terminate the Instrument working state on each measuring point, record and preserve acquisition
Time series data；Step（2）And step（3）In N-1 measuring point measuring instrument complete 20 minutes data to half an hour
After recording and preserving, preserve reference station data and reference station shuts down；
（6）The data that N platform instrument is obtained be uniformly processed through the professional software supporting with instrument obtain on N-1 measuring point and
The corresponding apparent resistivity of different frequency and impedance phase data, then frequency point data is converted into the formatted file of industrial standard,
Obtain audio magnetotelluric method data result eventually.
Further, as above a kind of solve electromagnetic interference field detection method of work, reference during field work
The selection principle stood is unmanned activity nearby, in the range of 1km no electromagnetic interference, be easy to picking and placeing of instrument.
Further, as above a kind of solve electromagnetic interference field detection method of work, step（2）In, collection
The apparatus measures Natural electromagnetic field signal frequency range of electric field signal is 0.00005Hz～10000Hz.
Further, as above a kind of solve electromagnetic interference field detection method of work, step（3）Middle measuring point is put
The instrument put and step（1）And step（2）In N-1 platform instrument between the temporal synchronization of gathered data is realized by GPS.
Brief description：
Fig. 1 is audio-frequency magnetotelluric magnetic method field work schematic diagram；
Fig. 2 is Anti-Jamming Technique field work schematic diagram；
Fig. 3 is Anti-Jamming Technique implementation result schematic diagram.
In figure：1- audio magnetotelluric method instrument, 2- north-south magnetic probe, 3- East and West direction magnetic probe, 4- electrode, 5- storage battery, 6-
Electric road acquisition station, 7- magnetic track acquisition station, 8-GPS position finder antenna, 9- reference station, 10- high-voltage line；In Fig. 3：Left side two figures are electricity
Signal and magnetic signal isolation technics obtain curve, and right side two figure be to obtain curve after remote reference technique process, top two figure be regarding
Resistivity curve, lower section two figure is impedance phase curves.
Specific embodiment：
Below in conjunction with the accompanying drawings technical solution of the present invention is described in detail.
Technical solution of the present invention a kind of solve electromagnetic interference field detection method of work, its layout scheme as shown in Fig. 2
Concrete grammar comprises the following steps：
（1）Arranging a reference station at measuring point about 10km, place 1 instrument be used for measuring Natural electromagnetic field
Raw magnetic gradient signal and electric field signal；During field work the selection principle of reference station be unmanned activity nearby, no electricity in the range of 1km
Magnetic disturbance, it is easy to picking and placeing of instrument.
（2）N-2 is placed on the measuring point near high-voltage line（N≥3）Tai electricity road acquisition station gathers the electric field signal at this point；
The apparatus measures Natural electromagnetic field signal frequency range of collection electric field signal is 0.00005Hz～10000Hz.
（3）Place a magnetic track acquisition station at vertical dimension high voltage transmission line about 300m measuring point, for gathering magnetic field letter
Number and electric field signal；Magnetic track acquisition station and step（1）And step（2）In N-1 platform instrument between gathered data is realized by GPS
Temporal synchronization.
（4）Lay step（2）And step（3）In N-1 measuring point on instrument and equipment after, this N-1 platform instrument is put
In working condition；After reference station device power-up, opening steps（2）And step（3）In N-1 measuring point on instrument and equipment carry out
Measurement；
（5）After all appts complete acquisition tasks, terminate the Instrument working state on each measuring point, record and preserve acquisition
Time series data；Step（2）And step（3）In N-1 measuring point measuring instrument complete 20 minutes data to half an hour
After recording and preserving, preserve reference station data and reference station shuts down；
（6）The data that N platform instrument is obtained be uniformly processed through the professional software supporting with instrument obtain on N-1 measuring point and
The corresponding apparent resistivity of different frequency and impedance phase data, then frequency point data is converted into the formatted file of industrial standard,
Obtain audio magnetotelluric method data result eventually.
In order to the specific embodiment of anti-high-voltage line perturbation technique is described, multi-functional with the V8 that Canadian phoenix company produces
Electrical prospecting apparatus（Model RXU-3ER；3 track datas can be measured, measurement Natural electromagnetic field signal frequency range is from 0.00005Hz simultaneously
To 10000Hz, 12V DC-voltage supply, power consumption is 15 watts；Tensor pattern is adopted in work）As a example introduce audio magnetotelluric method
The interference of high-voltage line how is overcome in method field work.For improving field work efficiency, saving job costs, anti-in real work
High-voltage line perturbation technique may because instrument condition, the difference of working condition and take different embodiments.
For example, if there are three instruments, and line direction and high-voltage line power transmission line trend be bordering on vertical, then at most may be used
To obtain the data on two measuring points simultaneously；If there are four instruments, then at most can obtain the number on three measuring points simultaneously
According to；If there are more instrument and equipments, then at most can obtain the measure dot number that instrument quantity subtracts 1.But due to audio-frequency magnetotelluric
Costly, and instrument more hired laborers cost also more high each side reason, so typically same working area for magnetic instrument equipment
Inside seldom there are more than 5 instruments to devote oneself to work simultaneously.Based on this because, below just there to be 4 instrument works simultaneously in a working area
Situation about making specifically introduces the implementation of anti-high-voltage line perturbation technique.
During field work, the layout scheme of 4 instruments uses two electrical signal collections and stands in the measuring point near high-voltage line
The upper measurement signal of telecommunication, a V8 main frame measures the signal of telecommunication and magnetic signal on the measuring point at Distance High Voltage Electricity Transfer about 300m simultaneously, and one
Individual V8 main frame is apart from the place of working area about 10km, as reference station, this programme of work once can complete three measuring points simultaneously
Measurement work.
During field work, lay reference station first, and instrument has been started shooting work.Then, then by accompanying drawing 3 lay other three
Instrument and equipment on individual measuring point, after the completion of instrument is started shooting, be placed in working condition.After all appts complete acquisition tasks, knot
Restraint the Instrument working state on each measuring point, record and preserve the time series data of acquisition.Three measuring instruments complete data note
After recording and preserving, notification reference station personnel, preserve reference station observation data.Finally, by the data of four instruments acquisitions through specialty
Software is uniformly processed, you can obtain the audio magnetotelluric method data result on three measuring points.
The data implementing anti-high-voltage line perturbation technique acquisition immediately below 110,000 volts of high-voltage lines is as shown in Figure 3.Generally, tradition
Measuring method cannot obtain any useful data at this measuring point, and should using obtain after anti-high-voltage line perturbation technique
Audio-frequency magnetotelluric magnetic data at point is visible as shown in Figure 3, cannot obtain data by traditional method below high-voltage line, to using electricity
The data available that signal is obtained with magnetic signal isolation technics, then obtain continuous, smooth high-quality to after remote reference technique process
Data, has absolutely proved the effect of anti-high-voltage line perturbation technique.
Claims (4)
1. a kind of solve electromagnetic interference field detection method of work it is characterised in that：Comprise the following steps：
(1) reference station is being set at measuring point about 10km, is placing the raw magnetic gradient letter of 1 apparatus measures Natural electromagnetic field
Number and electric field signal；
(2) on the measuring point near high-voltage line, placement N-2 Tai electricity road acquisition station gathers the electric field signal at this point, wherein N >=3；
(3) a magnetic track acquisition station, collection field signal and electric field are placed at vertical dimension high voltage transmission line about 300m measuring point
Signal；
(4), after having laid the instrument and equipment on N-1 measuring point in step (2) and step (3), this N-1 platform instrument is placed in work
Make state；After reference station device power-up, the instrument and equipment on N-1 measuring point in opening steps (2) and step (3) is surveyed
Amount；
(5), after all appts complete acquisition tasks, terminate the Instrument working state on each measuring point, record and preserve the time of acquisition
Sequence data；N-1 measuring point measuring instrument in step (2) and step (3) completes 20 minutes data records to half an hour
And after preserving, preserve reference station data and reference station shuts down；
(6) data that N platform instrument obtains is uniformly processed through the professional software supporting from instrument obtain on N-1 measuring point with different
The corresponding apparent resistivity of frequency and impedance phase data, then frequency point data is converted into the formatted file of industrial standard, finally obtain
Obtain audio magnetotelluric method data result.
2. as claimed in claim 1 a kind of solve electromagnetic interference field detection method of work it is characterised in that：Field work
When reference station selection principle be unmanned activity nearby, in the range of 1km no electromagnetic interference, be easy to picking and placeing of instrument.
3. as claimed in claim 1 a kind of solve electromagnetic interference field detection method of work it is characterised in that：Step (2)
In, the apparatus measures Natural electromagnetic field signal frequency range of collection electric field signal is 0.00005Hz～10000Hz.
4. as claimed in claim 1 a kind of solve electromagnetic interference field detection method of work it is characterised in that：Step (3)
Realized on the gathered data time by GPS between N-1 platform instrument in instrument and step (1) and step (2) that middle measuring point is placed
Synchronization.
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| CN110596763A (en) * | 2019-08-23 | 2019-12-20 | 南方科技大学 | Three-dimensional acquisition method and device for magnetotelluric data and terminal equipment |
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| CN107272067B (en) * | 2017-06-05 | 2019-06-18 | 长江大学 | A kind of optically-active oil prospecting method |
| CN108107478B (en) * | 2017-12-25 | 2019-06-04 | 湖南科技大学 | Magnetotelluric synchronizing detection and real time inversion method and system |
| CN109683202B (en) * | 2019-02-20 | 2020-06-16 | 湖南强军科技有限公司 | System and method for collecting electromagnetic exploration data |
| CN110441825B (en) * | 2019-09-04 | 2021-04-27 | 上海海事大学 | Visual detection method for electric wire in wall |
| CN114089428B (en) * | 2021-10-29 | 2022-08-12 | 中国矿业大学 | Time domain electromagnetic tensor well logging method |
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| CN110596763A (en) * | 2019-08-23 | 2019-12-20 | 南方科技大学 | Three-dimensional acquisition method and device for magnetotelluric data and terminal equipment |
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