CN106597552B - M shape three-dimensional electrical prospecting method - Google Patents
M shape three-dimensional electrical prospecting method Download PDFInfo
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- CN106597552B CN106597552B CN201611213025.5A CN201611213025A CN106597552B CN 106597552 B CN106597552 B CN 106597552B CN 201611213025 A CN201611213025 A CN 201611213025A CN 106597552 B CN106597552 B CN 106597552B
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- 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
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
Abstract
M shape three-dimensional electrical prospecting method, exploration targets body characteristics, topography and geomorphology relief feature the present invention is based on electrical prospecting area, by arranging M shape three-dimensional electrical prospecting supply terminals, it is powered using electrical prospecting transmitter by the electrode of supply terminals to underground, receive the electric field signal of all measurement points simultaneously using electrical prospecting receiver, the apparent resistivity and parameters of electrical induction of all measurement points during each supply terminals power supply of M shape are asked for, so as to fulfill M shape three-dimensional electrical prospecting.The present invention can overcome the shortcomings that two-dimentional electrical prospecting effect is poor, conventional three-dimensional electrical prospecting efficiency is low, the advantages of two-dimentional electrical prospecting is efficient, conventional three-dimensional electrical prospecting effect is excellent is inherited again, and a more preferably equalization point is found between the two in exploration efficiency and exploration effects.
Description
Technical field
The present invention relates to a kind of three-dimensional electrical prospecting methods in Key words exploration geophysics field.
Background technology
In Key words exploration geophysics field, electrical prospecting is divided into one-dimensional, two and three dimensions electrical prospecting.One-dimensional electrical prospecting by
Low in surveying accuracy, effect is poor, does not use substantially at present；Two-dimentional electrical prospecting precision and effect be superior to it is one-dimensional, but explore effect
Rate is less than the latter；The three-dimensional electrical method that conventional three-dimensional electrical prospecting is divided into completeness, right-angled intersection and Γ shapes arrangement measuring electrode is surveyed
It visits, precision and effect are superior to peacekeeping two dimension, but due to two-dimentional far more than a peacekeeping on supply terminals and measurement point quantity,
So as to cause conventional three-dimensional electrical prospecting efficiency far less than peacekeeping two dimension, therefore, although this method has exploration effect well
Fruit, but only used on a small quantity in the case where partly very crucial exploration area and funds are very sufficient.
Two-dimentional electrical prospecting needs to arrange electrical prospecting electric power system and measuring system in every exploration line, and rear issue
According to the data of every exploration line are individually handled as 2-D data in processing procedure, since practical exploration area is seldom deposited
It is more three-dimensional geological anomalous body in true two-dimentional geological anomalous body, therefore two-dimentional electrical prospecting achievement is approximate achievement,
It is poor so as to cause its exploration effects.But since two-dimentional electrical prospecting is powered, and on the supply terminals of an exploration line only same
Carry out the acquisition of electrical method data in one exploration line, exploration efficiency is higher, and exploration effects are currently used electricity better than one-dimensional
Method exploitation method.But since every exploration line of this method is required to arrangement electric power system, cause to arrange the workload of electric power system
It is larger；It often arranges that a supply lines only measures a measurement line, if exploration area is with a varied topography, vegetation development, can cause to be difficult to
Even can not arrange supply lines, so as to cause two-dimentional electrical prospecting can not carry out as a result, limiting this method in complicated landform
Application.
Assuming that some two-dimentional every, area of electrical prospecting survey line has m (m is the positive integer more than 1, same as below) a supply terminals
With m measurement point, there is n (n is the positive integer more than 1, same as below) survey line, surveyed using monopole-monopolar operation device
It visits, then needs to arrange m × n supply terminals in two-dimentional electrical prospecting, to acquire a two-dimentional electrical prospecting data of n × m × (m-1)
(supply terminals not measures in itself).If based on electrical prospecting principle of reciprocity, above-mentioned investigation and prospecting can be simplified, supply terminals
Number is a for n × (m-1), and it is n × (m-1) × (m-1)/2 to acquire two-dimentional electrical prospecting data.If the electrical of acquisition more deep
Feature, then supply terminals need to be extended to other than survey line endpoint, supply terminals quantity can accordingly increase, and further reduced this method
Exploration efficiency.
Completeness three-dimensional electrical prospecting method is respectively powered once to the supply terminals of entire exploration area, and each power supply
During point power supply, all measurement point gathered datas to entire exploration area are needed.This method is the geological anomalous body in practical exploration area
Consider as three-dimensional geological anomalous body, more meet practical geological condition.But due to the supply terminals of completeness three-dimensional electrical prospecting
It needs to cover all measurement points in entire three-dimensional electrical prospecting area, and the quantity of supply terminals is equal to measurement point quantity, needs pair
All supply terminals in entire exploration area are powered respectively, are needed when each supply terminals is powered to all in entire exploration area
Measurement point gathered data since supply terminals quantity is excessive, is multiplied so as to cause workload.
Assuming that some three-dimensional electrical prospecting rectangle region grid number is that (wherein m is the grid of one measurement line of X-direction to m × n
Number, n are the grid number of one measurement line of Y-direction), it is explored using monopole-monopolar operation device, then completeness three-dimensional electrical method
It needs to arrange m × n supply terminals, acquisition m × n × (m × n-1) a measurement data in exploration (supply terminals not measures in itself).
Based on electrical prospecting principle of reciprocity, half, as m × n × (m × n-1)/2 can be reduced to above-mentioned field data collection amount
Data.
Completeness three-dimensional electrical prospecting data volume and workload are much larger than two-dimentional electrical prospecting, so as to cause in practical exploration
It needs to put into a large amount of human and material resources and time in the process, efficiency is low, of high cost.In addition, in the wild in practical exploration process,
Due to three-dimensional electrical prospecting heavy workload, it is difficult to the workload of entire exploration area was completed within one day, once it needs complete across day
Into, then be required to arrange and recycle the electric power system and measuring system of entire exploration area daily, exist very big human and material resources and
Waste of time, also results in that its exploration efficiency is lower, and applicability is not strong.Moreover, because the electrical prospecting of completeness three-dimensional for
The landform requirement in ground observation area is high, if with a varied topography, vegetation development, to arrangement electrical prospecting electric power system and measuring system
Bring very big difficulty, it is possible to lead to not carry out complete three-dimensional electrical prospecting work.Therefore, completeness three-dimensional electrical method
Although exploration has apparent advantage in effect and precision, since its efficiency is too low, cost is excessively high, and landform was required
Height, so as to cause seldom being used in this method in the wild practical investigation and prospecting.
Based on the shortcomings that completeness three-dimensional electrical prospecting efficiency is very low, applicability is not strong, someone has studied cross at present
Intersect the three-dimensional electrical prospecting method with Γ shapes arrangement measuring electrode.Its starting point is mainly powered by reducing some supply terminals
When measured measurement point quantity, so as to fulfill field work amount is reduced, achieve the purpose that improve exploration efficiency.But right-angled intersection
The three-dimensional electrical prospecting method of shape measuring electrode and Γ shape measuring electrodes does not reduce supply terminals, the power supply of three-dimensional electrical prospecting
There is still a need for all measurement points in the entire three-dimensional electrical prospecting area of covering, the physical points quantity of supply terminals to be equal to the object of measurement point for point
Reason point quantity, since supply terminals quantity is excessive, and power supply technique is powered using timesharing branch at present, is only capable of every time to one
Supply terminals is powered, and can not be reduced so as to cause the workload of electric power system.This method selects when powering only with some supply terminals
Part measurement point acquisition electrical method data, but to complete data collection task during all supply terminals power supplies, entire exploration area is each
The physical points of measurement point are required to arrange only during certain supply terminals power supplies, have part measurement point not acquire electrical method data, not
It is reduced the physical points arrangement of measurement point.Therefore above-mentioned cruciform shape measuring electrode and Γ shape measuring electrode three-dimensionals electrical prospecting side
Method increases relative to the exploration efficiency of completeness three-dimensional electrical prospecting method, but reduces the confession of some supply terminals by then passing through
Measured measurement point quantity when electric, therefore there is still a need for all supply terminals progress time sharing power supply to entire exploration area, and need
Arrange the physical points of entire exploration area measurement point, therefore its exploration efficiency improves unobvious.
Assuming that some three-dimensional electrical prospecting rectangle region grid number is that (wherein m is the grid of one measurement line of X-direction to m × n
Number, n are the grid number of one measurement line of Y-direction), electrical prospecting is carried out using monopole-monopolar operation device, then cruciform shape
It needs to arrange (m × n-1) a supply terminals, acquisition in measuring electrode three-dimensional electrical prospecting
A measurement data；Arrangement (m × n-1) a supply terminals, acquisition are also needed in Γ shape measuring electrode three-dimensional electrical prospectingA electrical method data.The data collection capacity of both the above method is still very big, and efficiency carries
High unobvious.
Invention content
The purpose of the present invention is the exploration targets body characteristics based on electrical prospecting area, topography and geomorphology relief features, pass through cloth
The electrical prospecting supply terminals of M shape is put, reduces conventional three-dimensional electrical prospecting supply terminals quantity, realizes that M shape three-dimensional electrical method is surveyed
Spy method improves three-dimensional electrical prospecting efficiency and effect.
It, at present can not be by increasing more set power supplies since electrical prospecting electric power system is only capable of powering to a supply terminals every time
System is powered simultaneously, realizes the time for reducing arrangement electrical prospecting electric power system and cost.For conventional three-dimensional electrical prospecting
Speech, arrange that the labor intensity of electric power system is big, efficiency is low, if therefore can realize reduction supply terminals quantity, three can be significantly improved
Tie up electrical prospecting efficiency.Separately since electric power system is to meet the quality requirement of electrical prospecting acquisition signal, supply lines and power supply
It is extremely more complicated than electrical prospecting measuring system and heavy, therefore the quantity of supply terminals is reduced, it is adopted relative to the data for reducing measurement point
For collection amount, exploration efficiency improves more obvious.
Since electrical prospecting measuring system can be realized while acquire, by multichannel electrical prospecting measuring system or multiple
Electrical prospecting measuring system can realize the entire three-dimensional electrical prospecting data acquisition time of reduction and cost, so as to improve field
Exploration efficiency reduces exploration cost；And due to the data collection capacity for not reducing all measurement points of three-dimensional electrical prospecting, and can protect
The three-dimensional electrical prospecting effect of card.
The present invention is using the advantages of two-dimentional electrical prospecting is efficient, three-dimensional electrical prospecting precision and effect are excellent, based on electrical method
Exploration targets body characteristics, the topography and geomorphology relief feature of exploration area, by M shape three-dimensional electrical prospecting supply terminals layout rules,
Three-dimensional electrical prospecting supply terminals quantity is reduced, implements the three-dimensional electrical prospecting to measurement points all in exploration area, realizes and improves three
It ties up electrical prospecting efficiency and improves the purpose of exploration effects.The present invention can overcome that two-dimentional electrical prospecting effect is poor, conventional three-dimensional
The shortcomings that electrical prospecting efficiency is low, and the advantages of two-dimentional electrical prospecting is efficient, conventional three-dimensional electrical prospecting effect is excellent is inherited,
Exploration efficiency and exploration effects find a more preferably equalization point between the two.
M shape three-dimensional electrical prospecting method proposed by the present invention the specific steps are：
(1) Geological Achievements early period of look-ahead analysis exploration area infer the trend or main shaft square of main geologic anomalous body in area
To, approximately perpendicular to trend or major axes orientation setting M shape three-dimensional electrical prospecting X-direction, be approximately parallel to trend or main shaft
The Y-direction of direction setting M shape three-dimensional electrical prospecting, wherein X-direction are mutually perpendicular to Y-direction, and are horizontal direction；
(2) it is required according to exploration, determines the X-direction of exploration area and the exploration length of Y-direction, and determine X side in exploration area
To measurement point spacing c and the numerical value of Y-direction measurement point spacing d, so that it is determined that the numerical value of exploration area mesh parameter a and b；
(3) the exploration targets body characteristics based on exploration area, topography and geomorphology relief feature are supplied using the electrical prospecting of M shape
Electric dot grid coordinate (x, y) and practical relative coordinate (XC,YC) computation rule, determine all power supplies of M shape three-dimensional electrical prospecting
Dot grid coordinate (x, y) and practical relative coordinate (XC,YC), and arrange supply terminals；
(4) the exploration targets body characteristics based on exploration area, topography and geomorphology relief feature, will according to exploration in entire exploration area
Ask and X-direction measurement point spacing c, Y-direction measurement point spacing d, mesh parameter a and b numerical value, arrange that complete three-dimensional electrical method is surveyed
Visit measurement point；
(5) each supply terminals on above-mentioned selected M shape three-dimensional electrical prospecting supply lines is powered respectively, using more
Channel electrical prospecting measuring system or multiple electrical prospecting measuring systems are to the M shape three-dimensional electrical prospecting in entire exploration area
Measurement point carries out electrical method data acquisition, the M shape three-dimensional electrical method of all measurement points in exploration area when getting each supply terminals power supply
Survey data；
(6) all electrical prospecting measurement data are integrated into M shape three-dimensional electrical prospecting data, it is three-dimensional carries out M shape
Electrical data processing obtains the M shape three-dimensional electrical prospecting achievement of entire exploration area, so as to fulfill the rice word of entire exploration area
Shape three-dimensional electrical prospecting.
The X-direction of near normal trend or major axes orientation setting M shape three-dimensional electrical prospecting wherein in step (1), closely
The concrete meaning of the Y-direction of M shape three-dimensional electrical prospecting is set like parallel trend or major axes orientation as X-direction and main geologic
The trend or major axes orientation angle of anomalous body are close or equal to 90 degree as possible between 45~135 degree；Y-direction with mainly
The trend or major axes orientation angle of matter anomalous body are close or equal to 0 degree as possible between -45~45 degree；Wherein X-direction and Y
Direction is mutually perpendicular to, and is horizontal direction.
The numerical value of exploration area mesh parameter a and b are established rules then as follows really wherein in step (2)：If M shape three-dimensional electrical method
Exploration rectangle region X-direction is L meters long, and Y-direction is M meters long, and X-direction measurement point spacing is c meters in exploration area, Y-direction measurement point spacing
It it is d meters, using the central point of entire exploration area as origin, then the mesh parameter a and b of entire exploration area X-direction and Y-direction were calculated
Journey is as follows：If
M shape three-dimensional electrical prospecting supply terminals layout rules are divided into two kinds of situations wherein in step (3)：The first situation
For, M shape three-dimensional electrical prospecting rectangle region X-direction measure line length reach exploration targets body 2 times of predicted width and more than；
The second situation is that M shape three-dimensional electrical prospecting rectangle region X-direction measures 2 times of the predicted width that line length is exploration targets body
Below.
1st, the first situation reaches exploration targets body when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length
2 times of predicted width and it is above when, M shape three-dimensional electrical prospecting supply terminals layout rules of the invention are as follows：
If the grid lower-left angular coordinate of the exploration rectangle region is (- a ,-b), upper right angular coordinate is (a, b), then M shape three
Mesh coordinate (x, y) formula of dimension electrical prospecting supply terminals position is set as：
X, y, a, b, i wherein in formula (2), (3), (4), (5) are integer.
According to above rule, show that when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length be exploration targets
2 times of the predicted width of body and it is above when, using the central point of entire exploration area as origin, M shape three-dimensional electrical prospecting supply terminals position
Practical relative coordinate (the X putC,YC) formula is as follows：
(XC,YC)=(x × c, y × d) (6)
Wherein x, y be formula (2), (3), (4), (5) result of calculation.
2nd, the second situation, when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length as exploration targets body
When below 2 times of predicted width, M shape three-dimensional electrical prospecting supply terminals layout rules of the invention are as follows：
If landform limitation in exploration area is more, M shape three-dimensional electrical prospecting rectangle region X-direction measures line length as exploration mesh
2 times of the predicted width of standard type improves entire exploration area hereinafter, be then to be further reduced the boundary effect of exploration area boundary survey point
Surveying accuracy, all supply terminals take the spacing distance identical with measurement point in exploration area to arrange.
If the grid lower-left angular coordinate of the exploration area is (- a ,-b), upper right angular coordinate is (a, b), then the three-dimensional electricity of M shape
Mesh coordinate (x, y) formula of method exploration supply terminals position is set as：
X, y, a, b wherein in formula (7) are integer.
According to above rule, show that when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length be exploration targets
At less than 2 times of body predicted width, using the central point of entire exploration area as origin, M shape three-dimensional electrical prospecting supply terminals position
Practical relative coordinate (XC,YC) formula is as follows：
(XC,YC)=(x × c, y × d) (8)
X, y wherein in formula (8) are the result of calculation of formula (7).
The M shape three-dimensional electrical prospecting of the present invention uses single-pole device for electric installation, i.e., using in electrical prospecting meaning
A fixed current electrode of one infinity current electrode as three-dimensional electrical prospecting, another current electrode are then according to this
The mobile current electrode of M shape three-dimensional electrical prospecting supply terminals layout rules arrangement that invention proposes.
Two kinds of monopole and dipole measuring device may be used in the M shape three-dimensional electrical prospecting measuring device of the present invention.Monopole
Measuring device is measured using an infinity measuring electrode in electrical prospecting meaning as a fixed three-dimensional electrical prospecting
Electrode, another measuring electrode are the three-dimensional electrical prospecting measuring electrode moved in exploration area.Dipole measuring device is then two
Electrical prospecting measuring electrode is the three-dimensional electrical prospecting measuring electrode moved in exploration area.
To reduce, exploration area boundary survey point data amount is few to be led M shape three-dimensional electrical prospecting method proposed by the present invention
The Boundary Effect problem of cause proposes that the supply terminals by M shape three-dimensional electrical prospecting is arranged into other than exploration area, is surveyed to increase
The data volume of exploratory area boundary survey point, the surveying accuracy reduction of boundary survey point in exploration area caused by so as to weaken boundary effect
Problem.
M shape three-dimensional electrical prospecting method proposed by the present invention is due on straight line, having all supply terminals location arrangements
Conducive to the change that a position is powered in practical investigation and prospecting, current supply line can be also saved, improves and changes supply terminals position
Working efficiency and save exploration cost.
M shape three-dimensional electrical prospecting method proposed by the present invention, by choosing M shape three-dimensional electrical prospecting supply terminals,
Reach the quantity for reducing supply terminals, evading electrical prospecting electric power system can not power and bulky disadvantage simultaneously；It is proposed is not reduced
The mode of three-dimensional electrical prospecting measurement point quantity is fully excavated the advantage that electrical prospecting measuring system can acquire simultaneously, and is retained
The advantages of three-dimensional electrical prospecting effect is excellent, high efficiency and more excellent exploration effects so as to fulfill M shape three-dimensional electrical prospecting.It should
Method has the advantages that the high exploration efficiency of two dimension and three-dimensional high-precision exploration effects simultaneously.
Assuming that some three-dimensional electrical prospecting rectangle region grid number is that (wherein m is the grid of one exploration line of X-direction to m × n
Number, n are the grid number of one exploration line of Y-direction), it is explored using monopole-monopolar operation device, when three-dimensional electrical prospecting square
The length of shape area X-direction exploration line reach exploration targets body 2 times of predicted width and it is above when, then M shape three-dimensional electrical prospecting
It only needs to arrangeA supply terminals acquires altogether A three-dimensional electrical prospecting data.
For M shape three-dimensional electrical prospecting method proposed by the present invention due to substantially reducing power supply points, exploration efficiency is remote
Far above conventional three-dimensional electrical prospecting, but three-dimensional electrical prospecting pattern is used, exploration effects are better than conventional two dimension electricity
Method is explored.
If exploration area is excessive, multidomain treat-ment is carried out to exploration area, each small subregion carries out exploration area according to mentioned above principle
Mesh design, and carry out the M shape three-dimensional electrical prospecting of each small subregion, obtain the M shape three-dimensional electrical method of all small subregions
Survey data finally carries out the M shape three-dimensional electrical prospecting data processing of entire exploration area, obtains the rice word of entire exploration area
Shape three-dimensional electrical prospecting achievement.
If geological condition is few known to exploration area, it is difficult to judge the trend or major axes orientation of main geologic anomalous body, then it can be with
Preliminary analysis is first carried out to exploration area, it is appropriate to increase X-direction measurement point spacing c and Y-direction measurement point spacing d, select suitable position
It puts and carries out M shape three-dimensional electrical prospecting exploration sex work, after obtaining initial achievements, then reduction X-direction is carried out to main abnormal area
The ciphering type M shape three-dimensional electrical prospecting of measurement point spacing c and Y-direction measurement point spacing d, to realize exploration efficiency and to survey
Visit the optimization of effect.
Description of the drawings
Schematic diagram is arranged in the M shape three-dimensional electrical prospecting field that Fig. 1 is the present invention；
Fig. 2 is the two-dimentional electrical prospecting resistivity inversion achievement of No. 1 earth-electricity model monopole-monopole numerical simulation result；
Fig. 3 is the two-dimentional electrical prospecting resistivity inversion achievement of No. 1 earth-electricity model monopole-dipole numerical simulation result；
Fig. 4 be No. 1 earth-electricity model monopole-monopole numerical simulation result M shape three-dimensional electrical prospecting resistivity inversion into
Fruit；
Fig. 5 be No. 1 earth-electricity model monopole-dipole numerical simulation result M shape three-dimensional electrical prospecting resistivity inversion into
Fruit；
Fig. 6 be No. 1 earth-electricity model monopole-monopole numerical simulation result completeness three-dimensional electrical prospecting resistivity inversion into
Fruit；
Fig. 7 be No. 1 earth-electricity model monopole-dipole numerical simulation result completeness three-dimensional electrical prospecting resistivity inversion into
Fruit.
Specific embodiment
Below in conjunction with Fig. 1 and embodiment, the present invention will be further described, and explanation is surveyed using M shape three-dimensional electrical method below
Visit monopole power supply-monopole measuring device.
The electric power system and measuring system of this method can completely compatible existing electrical exploration equipments, and measuring system at present
It can be using multichannel electrical prospecting measuring system or more set electrical prospecting measuring systems.
Embodiment 1
1 in Fig. 1 is infinity current electrode, and 2 be infinity supply lines, and 3 be electrical prospecting transmitter, and 4 survey for connection
The supply lines of exploratory area supply terminals, 5 signified cross symbols move the supply terminals of power pole, 6 signified circles for electrical prospecting
Symbol is the measurement point of electrical prospecting measuring electrode, and part supply terminals is Chong Die with measurement point position.
Assuming that three-dimensional electrical prospecting rectangle region X-direction is L=400 meters long, Y-direction is M=400 meters long, and X-direction is surveyed in exploration area
Amount c=40 meter of a spacing of point, d=40 meters of Y-direction measurement point spacing, the predicted width of exploration targets body is 100 meters in exploration area, by
Reach 4 times of the predicted width of exploration targets body in three-dimensional electrical prospecting rectangle region X-direction measurement line length, then according to formula (1)
A=5, b=5 are acquired, then the grid lower-left angular coordinate of the exploration area is (- 5, -5), and upper right angular coordinate is (5,5).
According to formula (2), (3), (4) and (5)
X, y, a, b, i wherein in formula (2), (3), (4), (5) are integer.A, b numerical value are substituted into, acquires M shape three
The mesh coordinate (x, y) of dimension electrical prospecting supply terminals position is
X, y, i wherein in formula (9), (10), (11) and (12) are integer.
According to obtained as above, it can be deduced that the M shape three-dimensional electrical prospecting using entire exploration area central point as origin is powered
Practical relative coordinate (the X of point positionC,YC) be：
(XC,YC)=(x × 40, y × 40) (13)
X, y wherein in formula (13) are the result of calculation of formula (9), (10), (11) and (12).
According to above result of calculation, the concrete operations of M shape three-dimensional electrical prospecting monopole power supply-monopole measurement method
Step is as follows：
(1) Geological Achievements early period of exploration area are analyzed, the distribution situation of main geologic anomalous body in area is inferred, sets rice word
The X-direction of shape three-dimensional electrical prospecting sets the Y-direction and X-direction of M shape three-dimensional electrical prospecting across main geologic anomalous body
Vertically, wherein X and Y-direction are horizontal direction；
(2) according to the M shape three-dimensional electrical prospecting supply terminals mesh coordinate (x, y) and practical relative coordinate asked for above
(XC,YC), and combine exploration area actual conditions, the confession of the mobile current electrode on exploration area and periphery reasonable Arrangement supply lines
Electricity point 5；
(3) according to electrical prospecting principle and requirement selection infinity supply terminals outside exploration area, and infinity power supply is laid
Electrode 1 and current supply line 2；
(4) (the XA as shown in Figure 1 of supply terminals 5 of some M shape three-dimensional electrical prospecting movement current electrode is selected-13)
Lay current supply line 4 and mobile current electrode；
(5) according to electrical prospecting principle and requirement selection electrical prospecting infinity measurement point outside exploration area, and nothing is laid
Poor remote measuring electrode and conducting wire；
(6) measurement point 6 of all M shape three-dimensional electrical prospecting measuring electrodes is arranged by network style in exploration area, and
Lay measuring electrode and conducting wire；
(7) by electrical prospecting transmitter 3 to infinity current electrode 1 and 5 (such as Fig. 1 of supply terminals of mobile current electrode
Shown XA-13) on electrode power supply, record the power supply current value of supply terminals, system measured using multichannel or more set electrical prospecting
Electricity when system records supply terminals power supply in exploration area between the measurement point 6 of each measuring electrode and infinity measuring electrode
Method data, it is to be collected to finish, then electric power system is notified to change 5 position of the supply terminals (XA as shown in Figure 1 of current electrode-9、
XA-7、XA-5、XA-4、……XA13、YA-13、YA-9、YA-7、YA-5、YA-4、……YA13Deng), repeat above-mentioned electrical method data acquisition
Process, until having acquired the electrical method data of all measurement points when each supply terminals is powered；
(8) above-mentioned all M shape three-dimensional electrical prospecting supply terminals are got, the electrical method of all electrical prospecting measurement points is surveyed
After visiting data, ask for the apparent resistivity of M shape three-dimensional electrical prospecting or regarding the electrical methods parameter such as sharp electricity, handled by later data,
Get required M shape three-dimensional electrical prospecting achievement.
Through exploration efficiency contrast experiment, numerical simulation exploration effects contrast experiment, it can be found that the method that the invention proposes
It is significantly improved in exploration efficiency and exploration effects.
Exploration efficiency contrast experiment
Assuming that two dimension, completeness three-dimensional, cruciform shape measuring electrode three are carried out in the mesh generation exploration area to 11 × 11
Dimension, the three peacekeeping M shape three-dimensional electrical prospecting of Γ shapes measuring electrode, then the workload that each method is carried out is to such as 1 institute of table
Show.
More than 1 kinds of electrical prospecting workload contrast table of table
From upper table, it is apparent that the electrical prospecting of M shape three-dimensional is evaded as possible mainly by reducing supply terminals quantity
The disadvantage that can not be powered simultaneously using more electric power systems simultaneously, so as to improve the efficiency for laying supply terminals；By not reducing survey
The method of point is measured, the advantage that excavation multichannel measuring system or multiple measuring systems can measure simultaneously as possible ensures three-dimensional exploration
Exploration effects and improve working efficiency.Although the close two-dimentional electrical prospecting of the measurement data amount of M shape three-dimensional electrical prospecting
Six times, but since this method only lays 65 supply terminals, and this method uses three-dimensional electrical prospecting pattern, exploration effects are than two
It is truer to tie up exploration results.If the geological anomalous body of exploration area has multiple trends or major axes orientation, two-dimentional electrical prospecting needs
Exploration line is arranged in multiple directions, and the quantity of supply terminals is multiplied, and its achievement reliability is not high than upper table counts.
Therefore the electrical prospecting of M shape three-dimensional realizes that efficient, effect is excellent by carrying out three-dimensional electrical prospecting with supply terminals few as possible
Exploration.
Numerical simulation exploration effects contrast experiment
For comparison M shape three-dimensional electrical prospecting and two-dimentional electrical prospecting and the electrical prospecting of M shape three-dimensional and completeness
The exploration effects of three-dimensional electrical prospecting, ad hoc fixed No. 1 earth-electricity model：300 × 300 meters of exploration area, X-direction measurement point spacing c
Be 20 meters with Y-direction measurement point spacing d, powered using monopole-electric-method exploration device that measures of monopole carry out numerical simulation and
Inverting.Shoulder-bed resistivity (SBR) is 1000 ohm meters, and low-resistance exception body resistivity is 10 ohm meters.Low-resistance anomalous body is a length of side
For 100 meters of cube, low-resistance anomalous body is horizontal positioned, and plane coordinates ranging from (- 50, -50)~(50,50), top is buried
It is 20 meters deep, 100 meters of thickness.
Indoor numerical simulation is only carried out to X-direction for this and inverting compares.
Monopole power supply-monopole measurement is obtained by numerical simulation to No. 1 earth-electricity model and monopole power supply-dipole measures electrical method
Survey data, then to the data preparation of acquisition for corresponding two-dimentional electrical prospecting data, M shape three-dimensional electrical prospecting data with
And completeness three-dimensional electrical prospecting data, and two-dimentional electrical prospecting inversion program and three-dimensional electrical prospecting inversion program is respectively adopted
Inverting is carried out, gets the inverting achievement of three kinds of methods, two kinds of devices.
From the inverting result map of three kinds of methods, two kinds of devices, (Fig. 2,3,4,5,6,7, the isopleth in figure are equivalent for resistivity
Line) it can obtain, two-dimentional electrical prospecting inverting achievement is substantially accurate for low-resistance anomalous body morphological reaction, but for the electricity of country rock
There is apparent distortion phenomenon in the reaction of resistance rate.And M shape three-dimensional electrical prospecting inverting achievement is for low-resistance exception volume morphing
Reaction is better than two-dimentional electrical prospecting achievement, and similar with completeness three-dimensional electrical prospecting achievement, the low-resistance abnormal morphology of acquisition is basic
Upper is a rectangle low-resistance anomalous body, similar with No. 1 earth-electricity model actual conditions；For shoulder-bed resistivity (SBR) reaction than two-dimentional electrical method
Exploration results are truer, do not occur apparent distortion phenomenon, with No. 1 earth-electricity model goodness of fit be apparently higher than two-dimentional electrical prospecting into
Fruit.
By this to the three-dimensional electricity of the two-dimentional electrical prospecting, the electrical prospecting of M shape three-dimensional and completeness of No. 1 earth-electricity model
The numerical simulation and inverting that method exploration carries out, it is found that M shape three-dimensional electrical prospecting achievement and No. 1 practical feelings of earth-electricity model
The goodness of fit of condition is got well than two-dimentional electrical prospecting achievement, illustrates that the former exploration effects are more excellent.The electrical prospecting of M shape three-dimensional into
Fruit is similar with completeness three-dimensional electrical prospecting achievement, high with No. 1 earth-electricity model goodness of fit, but the former exploration efficiency is higher than the latter.
By being compared above to the exploration efficiency of a variety of methods, as a result the comparison of numerical simulation exploration effects all demonstrates this
The M shape three-dimensional electrical prospecting method that invention proposes significantly improves in exploration efficiency and exploration effects.
Claims (4)
1. M shape three-dimensional electrical prospecting method, it is characterised in that：Exploration targets body characteristics, landform based on electrical prospecting area
Looks relief feature arranges the electrical prospecting supply terminals of M shape, using electrical prospecting transmitter by the electrode of supply terminals to ground
Lower power supply is received the electric field signal of each measurement point in a plurality of exploration line using electrical prospecting receiver, asks for each confession simultaneously
The apparent resistivity and parameters of electrical induction of all measurement points, realize M shape three-dimensional electrical prospecting during electricity point power supply, the specific steps are：
(1) Geological Achievements early period of look-ahead analysis exploration area infer the trend or major axes orientation of main geologic anomalous body in area, closely
Like the X-direction perpendicular to trend or major axes orientation setting M shape three-dimensional electrical prospecting, it is approximately parallel to trend or major axes orientation
The Y-direction of M shape three-dimensional electrical prospecting is set, wherein X-direction is mutually perpendicular to Y-direction, and is horizontal direction；
(2) it is required according to exploration, determines the X-direction of exploration area and the exploration length of Y-direction, and determine that X-direction is surveyed in exploration area
The numerical value of amount point spacing c and Y-direction measurement point spacing d, so that it is determined that the numerical value of exploration area mesh parameter a and b；
(3) the exploration targets body characteristics based on exploration area, topography and geomorphology relief feature, using the electrical prospecting supply terminals of M shape
Mesh coordinate (x, y) and practical relative coordinate (XC,YC) computation rule, determine all supply terminals nets of M shape three-dimensional electrical prospecting
Lattice coordinate (x, y) and practical relative coordinate (XC,YC), and arrange supply terminals；
(4) the exploration targets body characteristics based on exploration area, topography and geomorphology relief feature, in entire exploration area according to exploration requirement and
X-direction measurement point spacing c, Y-direction measurement point spacing d, mesh parameter a and b numerical value, arrange that complete three-dimensional electrical prospecting is surveyed
Amount point；
(5) it powers respectively to each supply terminals on selected M shape three-dimensional electrical prospecting supply lines, using multichannel electrical method
Reconnaissance Survey system or multiple electrical prospecting measuring systems, which measure the M shape three-dimensional electrical prospecting in entire exploration area, to be clicked through
Row electrical method data acquire, the M shape three-dimensional electrical prospecting number of all measurement points in exploration area when getting each supply terminals power supply
According to；
(6) all electrical prospecting measurement data are integrated into M shape three-dimensional electrical prospecting data, carry out M shape three-dimensional electrical method
Data processing obtains the M shape three-dimensional electrical prospecting achievement of entire exploration area, so as to fulfill the M shape three of entire exploration area
Tie up electrical prospecting.
2. M shape three-dimensional electrical prospecting method as described in claim 1, it is characterised in that：Near normal in step (1)
In trend or the X-direction of major axes orientation setting M shape three-dimensional electrical prospecting, it is approximately parallel to trend or major axes orientation setting rice
The concrete meaning of the Y-direction of font three-dimensional electrical prospecting is X-direction and the trend of main geologic anomalous body or major axes orientation angle
Between 45~135 degree, and it is close or equal to 90 degree as possible；Y-direction and the trend or major axes orientation of main geologic anomalous body are pressed from both sides
Angle is close or equal to 0 degree as possible between -45~45 degree；Wherein X-direction is mutually perpendicular to Y-direction, and is level side
To.
3. M shape three-dimensional electrical prospecting method as claimed in claim 2, it is characterised in that：Exploration area grid in step (2)
The numerical value of parameter a and b are established rules then as follows really：
If three-dimensional electrical prospecting rectangle region X-direction is L meters long, Y-direction is M meters long, and X-direction measurement point spacing is c meters in exploration area, Y
Orientation measurement point spacing is d meters, using the central point of entire exploration area as origin, then the grid of entire exploration area X-direction and Y-direction
Parameter a and b calculating process is as follows：
4. M shape three-dimensional electrical prospecting method as claimed in claim 3, it is characterised in that：M shape in step (3)
Electrical prospecting supply terminals mesh coordinate (x, y) and practical relative coordinate (XC,YC) computation rule is：
A when) the topography and geomorphology relief feature in electrical prospecting area does not influence the arrangement of exploration line, M shape three-dimensional electrical prospecting rectangle
Area X-direction measure line length reach exploration targets body 2 times of predicted width and more than, then M shape three-dimensional electrical prospecting is powered
Dot grid coordinate (x, y) and practical relative coordinate (XC,YC) computation rule is as follows：If the grid lower left corner of the exploration rectangle region is sat
It is designated as (- a ,-b), upper right angular coordinate is (a, b), then the mesh coordinate (x, y) of M shape three-dimensional electrical prospecting supply terminals position is set
It is set to：
X, y, a, b, i wherein in formula (2), (3), (4), (5) are integer；
According to above rule, show that when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length be that exploration targets body is pre-
Survey 2 times of width and it is above when, using the central point of entire exploration area as origin, M shape three-dimensional electrical prospecting supply terminals position
Practical relative coordinate (XC,YC) formula is as follows：
(XC,YC)=(x × c, y × d) (6)
Wherein x, y be formula (2), (3), (4), (5) result of calculation；
B when) the topography and geomorphology relief feature in electrical prospecting area influences the arrangement of exploration line, lead to M shape three-dimensional electrical prospecting square
Shape area X-direction measures 2 times that line length is less than the predicted width of exploration targets body, then M shape three-dimensional electrical prospecting supply terminals net
Lattice coordinate (x, y) and practical relative coordinate (XC,YC) computation rule is as follows：If the grid lower-left angular coordinate of the exploration area for (- a ,-
B), upper right angular coordinate is (a, b), then the mesh coordinate (x, y) of M shape three-dimensional electrical prospecting supply terminals position is set as：
X, y, a, b wherein in formula (7) are integer；
According to above rule, obtain and be less than exploration targets body when M shape three-dimensional electrical prospecting rectangle region X-direction measures line length
At 2 times of predicted width, using the central point of entire exploration area as origin, the reality of M shape three-dimensional electrical prospecting supply terminals position
Relative coordinate (XC,YC) formula is as follows：
(XC,YC)=(x × c, y × d) (8)
X, y wherein in formula (8) are the result of calculation of formula (7).
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