CN105866848B - Deep mine electromagnetic detection method and apparatus thereof - Google Patents
Deep mine electromagnetic detection method and apparatus thereof Download PDFInfo
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- CN105866848B CN105866848B CN201610133889.XA CN201610133889A CN105866848B CN 105866848 B CN105866848 B CN 105866848B CN 201610133889 A CN201610133889 A CN 201610133889A CN 105866848 B CN105866848 B CN 105866848B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
Abstract
The invention discloses a deep mine electromagnetic detection method and an apparatus thereof. The deep mine electromagnetic detection method comprises the following steps of using an artificial source form and emitting a predetermined frequency band signal into the ground through a grounding electrode; using a synchronous array distribution observation system to simultaneously carry out data acquisition and taking the data as actual measurement data; and screening the actual measurement data so as to using the screened data to realize electromagnetic detection of a deep mine. The deep mine electromagnetic detection apparatus can execute data acquisition and processing functions which are the same with the functions realized through using the deep mine electromagnetic detection method. By using the method and the apparatus, unqualified data can be removed so as to acquire high quality observation data, a signal to noise ratio is increased and accurate detection to the deep underground resources is realized.
Description
Technical field
The present invention relates to electromagnetic surveying technology, espespecially a kind of deep ore deposit electromagnetic exploration method and device.
Background technology
Artificial source's electromagnetic method is a kind of earth lead of utilization human controllable or earth-free loop line launches electromagnetism to underground
Ripple or electromagnetic field, sub-terrain mines are known from experience and are produced response to this electromagnetic field, ground, aerial, in the range of inferior certain space
Receive this induced signal, by being analyzed to this induced signal processing, realization carries out pre- to the underground ore bodies state of depositing
A kind of geophysical exploration surveyed.
At present although the existing equipment being used for artificial source's electromagnetic method on market can be used as the earth electricity of frequency domain and time-domain
Property structure detect and subterranean resource detects, but be not suitable for the observation of 3 D electromagnetic method, data and be easily subject to environmental disturbances, and be unfavorable for open country
The shortcomings of outer real time inspection quality of data.
Content of the invention
Brief overview with regard to the present invention is given below, to provide basic with regard to certain aspects of the invention
Understand.This general introduction is not the exhaustive general introduction with regard to the present invention.It is not intended to determine the key or important of the present invention
Part, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form, in this, as
The preamble in greater detail discussed after a while.
In consideration of it, the invention provides a kind of deep ore deposit electromagnetic exploration method and device, at least to solve for artificial source
The prior art of electromagnetic method is not suitable for the observation of 3 D electromagnetic method, data is easily subject to environmental disturbances, and is unfavorable for field real time inspection
The shortcomings of quality of data.
According to an aspect of the invention, it is provided a kind of deep ore deposit electromagnetic exploration method, the method includes：Using artificial
Source form, launches predetermined frequency band signal by earth electrode to underground；Entered using synchronous array distributed observation system simultaneously
Row data acquisition, as measured data；And data screening is carried out to measured data, to realize deep using the data after screening
Ore deposit electromagnetic surveying.
Further, the precision of array distributed observation system is higher than 100ns.
Further, the step carrying out data screening to measured data includes：Actual measurement number is rejected using man-machine interaction mode
According in mutation survey sheet data；And/or the catastrophe point in rejecting measured data；And/or mean square deviation is more than in rejecting measured data
Or it is equal to the data of predetermined threshold.
Further, reject mean square deviation in measured data to be more than or equal in the step of data of predetermined threshold, using low
The round and smooth method of pass filter is carrying out data rejecting.
Further, predetermined frequency band signal includes following frequency band：10-3Hz～104Hz.
According to another aspect of the present invention, a kind of deep ore deposit electromagnetic exploration apparatus are additionally provided, this device includes：Transmitting
Unit, it is used for, using artificial source's form, generator energy being converted to by emitter and launching predetermined frequency band signal to underground
Excitation energy, and underground is injected by earth electrode；Collecting unit, it is used for using synchronous array distributed observation system
Carry out data acquisition, as measured data simultaneously；And data processing unit, it is used for carrying out data screening to measured data,
To realize deep ore deposit electromagnetic surveying using the data after screening.
Further, data processing unit is used for：Piece number is surveyed in the mutation rejected using man-machine interaction mode in measured data
According to；And/or the catastrophe point in rejecting measured data；And/or mean square deviation is more than or equal to predetermined threshold in rejecting measured data
Data.
Further, data processing unit mean square deviation in rejecting measured data is more than or equal to the data of predetermined threshold
During, data rejecting is carried out using the round and smooth method of LPF.
Further, predetermined frequency band signal includes following frequency band：10-3Hz～104Hz.
The present invention, in the form of artificial source, by earth electrode, launches a kind of broadband signal to underground, and passes through one
Plant the induced signal that array distributed observation system collection includes underground ore bodies information electric field and magnetic field, by removing number of non-compliances
According to obtain high-quality discharge observation data, improve signal to noise ratio, realize underground deep resource is more accurately detected.
The defect of prior art is：Be not suitable for the observation of 3 D electromagnetic method, interference number for artificial source's electromagnetic method prior art
Poor according to filter effect, by the real time inspection quality of data in the wild of the screen on instrument, there is inconvenient operation, be easily subject to sunlight shadow
Not the shortcomings of sound does not see, power consumption is big, equipment instrument is big.The present invention passes through the synchronization of high precision collecting station, realizes receiver extensive
Array is observed, and using technology such as the round and smooth methods of LPF, removes interference data, obtains high s/n ratio signal, using WIFI
Radio Transmission Technology and panel computer monitoring technology are so that the field inspection quality of data is more convenient, equipment instrument is less, power consumption
Little, suitable field three-dimensional exploration demand on a large scale.
Other features and advantages of the present invention will illustrate in the following description, and, partly become from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
In claim and accompanying drawing, specifically noted structure is realizing and to obtain.
Brief description
Accompanying drawing is used for providing technical solution of the present invention is further understood, and constitutes a part for specification, with this
The embodiment of application is used for explaining technical scheme together, does not constitute the restriction to technical solution of the present invention.
Fig. 1 is the flow chart of an exemplary process of deep ore deposit electromagnetic exploration method of the present invention；
Fig. 2A is the oscillogram of the predetermined frequency band signal to underground transmitting；
Fig. 2 B is the structural representation to unit observation device for traditional equator；
The structural representation of the array distributed observation system that Fig. 2 C adopts for the present invention；
Fig. 3 is the block diagram of an exemplary construction of deep ore deposit electromagnetic exploration method of the present invention；
Fig. 4 A is the result schematic diagram after measured signal being processed in preferred embodiment；
Fig. 4 B shown for L2 survey line resistivity profile schematic diagram in preferred embodiment and its with comparing of Rock character drill hole block diagram
It is intended to.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case of not conflicting, in embodiment in the application and embodiment
Feature can mutually be combined.
Can be in the computer system of such as one group of computer executable instructions in the step that the flow process of accompanying drawing illustrates
Execution.And although showing logical order in flow charts, but in some cases, can be with suitable different from herein
The shown or described step of sequence execution.
The embodiment provides a kind of deep ore deposit electromagnetic exploration method, the method includes：Using artificial source's form,
Predetermined frequency band signal is launched to underground by earth electrode；Carry out data using synchronous array distributed observation system to adopt simultaneously
Collection, as measured data；And data screening is carried out to measured data, visited with realizing deep ore deposit electromagnetism using the data after screening
Survey.In the present invention, earth lead is relied on to launch electromagnetic wave, electromagnetism wave direction underground propagation to underground ore bodies, Ran Houhan to underground
The electromagnetic wave having subsurface resistivity information is back to ground, is observed, according to sight in the scope certain apart from earth lead
Survey signal, be capable of underground ore bodies are deposited with the supposition of state.
One example process flow of above-mentioned deep ore deposit electromagnetic exploration method is described with reference to Fig. 1.
As shown in figure 1, starting execution step S101, using artificial source's form, predetermined to underground transmitting by earth electrode
Band signal.Then, execution step S102.
For example, the conductor length of earth electrode can be 1000-2000 rice, and transmission power maximum can be 50 kilowatts, root
According to the difference of earth resistance, emitting voltage can lie prostrate for 500--1000, and emission current can be 10-50A.Additionally, issuing to ground
Penetrating predetermined frequency band signal is broadband square wave (as shown in Figure 2 A), and frequency band range is 10-3Hz～104Hz, that is, front end frequency
Rate is 10kHz, and low frequency end is 1000s.
In step s 102, carry out data acquisition using synchronous array distributed observation system, as actual measurement number simultaneously
According to.Then, execution step S103.Wherein, the precision of array distributed observation system is higher than for example 100ns.
At present, use traditional equator as shown in Figure 2 B in prior art to unit observation device.With existing skill
Art is different, in the present invention, to be observed using array distributed observation system as that shown in fig. 2 c.That is, in the present invention
In, lay array acquisition station (at most up to 200) in the place leaving transmitting wire source 4-10 kilometer, that is, array distributed
Observation system, the data acquisition of each array acquisition station was carried out in the same time.Between acquisition station, because certain needs
Will (such as terrain obstruction etc.), can acquisition station nearby is carried out configuring, supervise using some handheld terminals relatively far apart
And management.Handheld terminal can as requested in all acquisition stations in batch configuration wireless coverage area or sampling observation region arbitrarily
The working condition of acquisition station, is monitored to acquisition station each in region and manages.
In step s 103, data screening is carried out to measured data, to realize deep ore deposit electromagnetism using the data after screening
Detect, then terminate to process.In step s 103, for example migration imaging can be carried out, to realize depth using 3D integral equation method
Portion's ore deposit electromagnetic surveying.
Further, the step that in step S103, measured data is carried out with data screening can include：Using man-machine interaction
Piece (slice) data (the hereinafter referred to as first Screening Treatment) is surveyed in the mutation that mode is rejected in measured data；And/or reject actual measurement number
According in catastrophe point (the hereinafter referred to as second Screening Treatment)；And/or mean square deviation is more than or equal to predetermined threshold in rejecting measured data
The data (the hereinafter referred to as the 3rd Screening Treatment) of value.That is, can select according to actual needs in step S103 to execute
One of first to the 3rd Screening Treatment is processed or multiple process, and the sequencing processing is also not necessarily limited to this, for example may be used
With the order execution according to the three, the second, the first Screening Treatment, etc..
Because, in data acquisition, some survey pieces may be subject to the humanity environmental catastrophe such as thunder and lightning, electric welding such as to disturb.
In this case it is necessary to edlin is entered to the survey piece that will be superimposed, the record being interfered is rejected, retain and be not affected by disturbing
Or the little data that is interfered carries out frequency domain superposition (i.e. the first Screening Treatment), thus obtaining more preferable result.
Additionally, in the serious region of electromagnetic interference, all data surveying piece of some frequencies all may can be subject to very big doing
Disturbing, the kick on frequency-apparent resistivity curve of the data after causing to be superimposed, thus forming flying spot, for such data, entering pedestrian
Operation mutually rejected by industry and traffic, retains remaining data (i.e. the second Screening Treatment), so that the effect of subsequent treatment is more preferable.
Additionally, being directed to the 3rd Screening Treatment, for example, can be returned using such as adjacent three point Linears, alpha-trim filters
Etc the round and smooth method of LPF preferable to carry out data rejecting, treatment effect.
The present invention, in the form of artificial source, by earth electrode, launches a kind of broadband signal to underground, and passes through one
Plant the induced signal that array distributed observation system collection includes underground ore bodies information, to obtain height by removing number of non-compliances evidence
Quality observes data, realizes underground deep resource is more accurately detected.
Additionally, present invention also offers a kind of deep ore deposit electromagnetic exploration apparatus, as shown in figure 3, this device includes：Transmitting is single
Unit 1, it is used for, using artificial source's form, generator energy being converted to by emitter and launching predetermined frequency band signal to underground
Excitation energy, and underground is injected by earth electrode；Collecting unit 2, it is used for using synchronous array distributed observation system
(precision of array distributed observation system is higher than for example 100ns) carries out data acquisition, as measured data simultaneously；And data
Processing unit 3, it is used for carrying out data screening to measured data, to realize deep ore deposit electromagnetic surveying using the data after screening.
The present invention, in the form of artificial source, by earth electrode, is launched a kind of broadband signal to underground, and is divided by a kind of array
The collection of cloth observation system includes the induced signal of underground ore bodies information, to obtain high-quality discharge observation by removing number of non-compliances evidence
Data, realizes underground deep resource is more accurately detected.
Further, data processing unit 3 is used for：Piece number is surveyed in the mutation rejected using man-machine interaction mode in measured data
According to；And/or the catastrophe point in rejecting measured data；And/or mean square deviation is more than or equal to predetermined threshold in rejecting measured data
Data.
Further, data processing unit 3 mean square deviation in rejecting measured data is more than or equal to the data of predetermined threshold
During, the round and smooth method of LPF using such as adjacent three point Linears recurrence, alpha-trim filtering etc to be carried out
Data is rejected.
Further, predetermined frequency band signal includes following frequency band：10-3Hz～104Hz.
Preferred embodiment
Survey area to be seated near at the 35km of Huludao City northwest.Surveying in area has three borings, is JK-1 well, JK-2 well respectively
With JK-3 well.Arrange four hatchings of northwest-southeastern direction N-W302 ° altogether as four surveys line L1, L2, L3 and L4, wherein
L2 line passes through JK-1 well and JK-2 well.Article four, survey line is respectively about 3.75km, the common 15.24km of length, and physics depth measurement points (are surveyed
Point) 744.Measuring point spacing 20m, interval of survey line 50m.
The length on ground long wire source (earth electrode) is about 1500 meters, and transmission power is 40 kilowatts, and emitting voltage is
1000 volts, emission current is 40A, and operating frequency range is 0.25～7680Hz, and transmitted waveform is as shown in Figure 2 A.Additionally, adopting
Array distributed observation system measures as that shown in fig. 2 c, reception and transmission range about 10km.
Fig. 4 A is to process acquired results according to the data screening in step S103, specifically includes following process：Number will be surveyed
According in catastrophe point reject；Apparent resistivity in log-log coordinate is rejected more than the data of 45 degree of scopes with the change of frequency；
The data that mean square deviation is more than predetermined threshold is rejected.In figure hollow dots data and curves represent the signal curve of before processing, and solid
It is clear that curve smoother after processing, the quality of data is obviously improved signal curve after then expression is processed for the point data curve.
Fig. 4 B is measurement apparent resistivity section (computational methods of apparent resistivity and the conventional method phase of L2 line cut-away section
With here no longer describes), and carry out to comparing with the lithological column of boring.Boring discloses 5 electric layers, thickness 390m
Left and right is sandstone, siltstone and conglomeratic sand rock stratum；It is lower be thickness 237m about conglomerate and aluminiferous ore bed；Third layer is electricity
The extremely low mud stone of resistance rate is embedded coal seam, and it is the preferable anthracite of quality that core discloses coal, the as little as several ohm meter of resistivity；4th
Layer is the limestone of middle high resistant, crystalline limestone, skarns；More than 1700 meter of hole termination depth, is the granitic batholith bottom of high resistivity.From figure
4B can be seen that the lithology difference that prospecting results can reflect underground well, especially for the low-resistance coal near -600m depth
The explanation results of layer are coincide with the lithology of drilling well, have absolutely proved practicality and the validity of the art of this patent.
Although disclosed herein embodiment as above, described content only readily appreciates that the present invention adopts
Embodiment, is not limited to the present invention.Technical staff in any art of the present invention, is being taken off without departing from the present invention
On the premise of the spirit and scope of dew, any modification and change can be carried out in the form implemented and details, but the present invention
Scope of patent protection, still must be defined by the scope of which is defined in the appended claims.
Claims (6)
1. a kind of deep ore deposit electromagnetic exploration method is it is characterised in that described deep ore deposit electromagnetic exploration method includes：
Using artificial source's form, predetermined frequency band signal is launched to underground by earth electrode；
Carry out data acquisition using synchronous array distributed observation system, as measured data simultaneously；And to described actual measurement
Data carries out data screening, to realize deep ore deposit electromagnetic surveying using the data after screening；
Wherein, during data screening is carried out to described measured data：
It is subject to thunder and lightning, is welded the situation of mutation disturbance for surveying piece in data acquisition, institute is rejected using man-machine interaction mode
Sheet data is surveyed in the mutation stated in measured data；And
For the situation serious in electromagnetic interference, reject the catastrophe point in described measured data；And
The data that mean square deviation in described measured data is more than or equal to predetermined threshold is rejected using the round and smooth method of LPF.
2. deep according to claim 1 ore deposit electromagnetic exploration method is it is characterised in that described array distributed observation system
Precision be higher than 100ns.
3. deep according to claim 1 ore deposit electromagnetic exploration method is it is characterised in that all square in described rejecting measured data
Difference, more than or equal in the step of data of predetermined threshold, to carry out data rejecting using the round and smooth method of LPF.
4. the deep ore deposit electromagnetic exploration method according to any one of claim 1-3 is it is characterised in that described predetermined frequency band
Signal band scope is：10-3Hz～104Hz.
5. a kind of deep ore deposit electromagnetic exploration apparatus are it is characterised in that described deep ore deposit electromagnetic exploration apparatus include：
Transmitter unit, it is used for, using artificial source's form, generator energy being converted to predetermined to underground transmitting by emitter
The excitation energy of band signal, and underground is injected by earth electrode；
Collecting unit, it is used for carrying out data acquisition using synchronous array distributed observation system, as measured data simultaneously；
And
Data processing unit, it is used for carrying out data screening to described measured data, to realize deep using the data after screening
Ore deposit electromagnetic surveying；Wherein, during data screening is carried out to described measured data：
It is subject to thunder and lightning, is welded the situation of mutation disturbance for surveying piece in data acquisition, institute is rejected using man-machine interaction mode
Sheet data is surveyed in the mutation stated in measured data；And
For the situation serious in electromagnetic interference, reject the catastrophe point in described measured data；And
The data that mean square deviation in described measured data is more than or equal to predetermined threshold is rejected using the round and smooth method of LPF.
6. deep according to claim 5 ore deposit electromagnetic exploration apparatus it is characterised in that described predetermined frequency band signal include as
Lower frequency band：10-3Hz～104Hz.
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2016
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| US4544892A (en) * | 1982-02-18 | 1985-10-01 | Geonics Limited | Signal processing apparatus for frequency domain geophysical electromagnetic surveying system |
| CN102183792A (en) * | 2011-03-01 | 2011-09-14 | 吉林大学 | Artificial source frequency domain electromagnetic sounding device and measurement method |
| CN104749653A (en) * | 2013-12-31 | 2015-07-01 | 北京大学 | Method for exploring gas enrichment area of underground coal seam based on multi-spectrum electromagnetic wave |
| CN105277992A (en) * | 2015-12-02 | 2016-01-27 | 山东科技大学 | Method for dynamically monitoring stope bottom plate water regime through equator dipole device |
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