CN105549101B - A kind of transient electromagnetic data differential conductance means of interpretation - Google Patents
A kind of transient electromagnetic data differential conductance means of interpretation Download PDFInfo
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- CN105549101B CN105549101B CN201610061215.3A CN201610061215A CN105549101B CN 105549101 B CN105549101 B CN 105549101B CN 201610061215 A CN201610061215 A CN 201610061215A CN 105549101 B CN105549101 B CN 105549101B
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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
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
A kind of transient electromagnetic data differential conductance means of interpretation, belongs to geophysical exploration data interpretation method.Differential conductance means of interpretation is the induced electromotive force based on the acquisition of transient electromagnetic prospecting method in the different means of interpretation of the different regional decay characteristics of resistivity；S1, Different Strata model designed according to electrical property difference, forward simulation is carried out to various stratigraphic models, and data acquired collected；S2, the transient electromagnetic induced electromotive force data for acquisition, are explained using differential conductance method to transient electromagnetic data, the fluctuating situation for the curve that observation transient electromagnetic differential conductance value changes over time.Used when judging suitable for ground and underground strata division, water zone.It is different that electromagnetic field decay rate is spread in stratum based on different resistivity, line translation is entered to the induced electromotive force V in Transient Electromagnetic Apparatus data measured and time t, divide electric layers by the analysis to transformation results and judge water zone, enrich transient electromagnetic data means of interpretation.
Description
Technical field
The present invention relates to a kind of geophysical exploration data interpretation method, particularly a kind of transient electromagnetic data differential conductance
Means of interpretation.
Background technology
China is in fast development, and resource is the basic of guarantee national development, in resource exploration and recovery process
In, geophysical exploration serves significant role.Particularly in terms of mine water inrush preventing and treating, transient electromagnetic method has obtained widely
Using reducing the generation of mine water inrush accident, reduce economic loss, ensure that the safety of the people.Transient electromagnetic method is one
The method of the great development prospect of kind, it is sensitive to low-resistance abnormal response, can find out aqueous geology such as Cave and passage, colliery
Goaf, the irregular water body in deep etc..Transient electromagnetic method has that investigation depth is big, sensitive to low-resistance geologic body, with detecting target
Couple, the advantages that exception response is strong, and form is simple, and resolution capability is strong.
Transient electromagnetic method is also referred to as TDEM, and abbreviation TEM, it is using earth-free loop line or is grounded line source to underground
Launch pulsatile once magnetic field, in pulsatile once magnetic field tempus intercalare, utilize the side of coil or grounding electrode observation secondary turbulence field
Method.Briefly, the general principle of transient electromagnetic method is exactly the law of electromagnetic induction.Attenuation process is generally divided into early, neutralization late period.
The electromagnetic field of early stage is equivalent to the radio-frequency component in frequency domain, and decay is fast, and skin depth is small；And late period composition is then equivalent to frequency
Low-frequency component in domain, decay is slow, and skin depth is big.The secondary field of each period changes over time rule after being powered off by measurement
Rule, can obtain the ground electrical feature of different depth.
During transient electromagnetic detecting, electromagnetic field is decayed very fast in high resistant object, and is decayed in low-resistance object
It is relatively slow, difference between the two is more obvious.
But for transient electromagnetic data common version be usually using apparent resistivity section diagram, multiple instrument channels profile figure as
Main, means of interpretation is single.
The content of the invention
The invention aims to provide a kind of transient electromagnetic data differential conductance means of interpretation, solves current transient electromagnetic
Data interpretation method relative to other geophysical exploration methods it is relatively simple the problem of.
The object of the present invention is achieved like this：Differential conductance means of interpretation is obtained based on transient electromagnetic prospecting method
Induced electromotive force is in the different means of interpretation of the different regional decay characteristics of resistivity；Comprise the following steps that：
S1, Different Strata model designed according to electrical property difference, forward simulation is carried out to various stratigraphic models, and to obtained number
According to being collected.
In the S1 steps, to the different types of stratigraphic model of design in the case where keeping other factors constant, become
Change its certain Graph One factor and carry out forward simulation, and resulting transient electromagnetic data is subjected to Classifying Sum, specific steps include：
(1) homogeneous half space transient electromagnetic model, resistivity ρ, depth h, and h=∞ are designed, changes the big of ρ values
It is small, obtain multigroup homogeneous half space transient electromagnetic data, including period, time t and corresponding induced electromotive force value V；
(2) two layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；The second layer
Resistivity is ρ2, the second layer depth is h2=∞, changes ρ respectively1、h1、ρ2Size, obtain two layers of transient electromagnetic data of level,
Including period, time t and corresponding induced electromotive force value V；
(3) three layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；The second layer
Resistivity is ρ2, the second layer depth is h2；Third layer resistivity is ρ3, third layer depth is h3=∞, changes ρ respectively1、h1、ρ2、
h2、ρ3Size, obtain three layers of transient electromagnetic data of level, including period, time t and corresponding induced electromotive force value V.
The fluctuating situation for the curve that S2, observation transient electromagnetic differential conductance value change over time, obtains transient electromagnetic sensing
Electromotive force data, transient electromagnetic data is explained using differential conductance method.
In the S2 steps, differential conductance method, specific steps include：
S21, the cubic spline interpolation on time t is done to gained transient electromagnetic induced electromotive force value V, obtained more abundant
Transient electromagnetic data, ensure by differential conductance processing after curve obtained it is round and smooth as far as possible, the solution more conducively to data
Release；
S22, under log-log coordinate system, draw out the curve that transient electromagnetic induced electromotive force V changes with time t；
S23, the committed step of differential conductance processing is carried out to transient electromagnetic data to ask for transient electromagnetic differential conductance value
K, expression formula are：
Its differential conductance value K is asked with the time t curves changed to the induced electromotive force V under log-log coordinate system；
S24, the curve that differential conductance value K changes with time t, i.e. transient electromagnetic differential are drawn out under single pair number coordinate system
Conductance plots；
S25, same type of differential conductance value K is pooled to together with the curve that time t changes according to its changed factor
In one coordinate system, it is fabricated to and collects curve map；
When to three layers of H type Stratigraphic Curves, only changing its second layer depth h2, keep other specification it is constant, then its change because
Son is the second layer depth h2, the obtained curve map that collects is properly termed as three layers of H types stratum second layer change in depth differential conductance and converges
Master curve figure；
S26, according to transient electromagnetic differential conductance curve fluctuating situation, observing its extreme point position accurately can divide ground
Underground low-resistance anomalous body is found in bed boundary.
Traditional transient electromagnetic data is generally based on the size of apparent resistivity, is provided by apparent resistivity isoline figure
Material explains that Comparatively speaking, advantages and advantages of the invention are：Explanation to transient electromagnetic data obtains in terms of layering
It is progressive, the ability to bed boundary division is improved, can effectively judge the interface of anomalous body and surrounding country rock；Based on transition
Electromagnetic induction electromotive force is not done any near to initial data the different regional decay characteristics of resistivity are widely different the characteristics of
Seemingly, the authenticity and integrality of data are ensure that, enriches transient electromagnetic means of interpretation.
Brief description of the drawings：
Fig. 1 is the curve that three layers of H types formation induction electromotive force V of transient electromagnetic change with time t under log-log coordinate system.
Fig. 2 is the curve that three layers of H types formation induction electromotive force V of transient electromagnetic after coordinate transform change with time t.
Fig. 3 is the curve that three layers of H types stratum differential conductance value K of transient electromagnetic change with time t under single pair number coordinate system.
Fig. 4 a are three layers of H types stratum second layer change in depth induced electromotive force congruence of curves of transient electromagnetic under single pair number coordinate system
Total figure.
Fig. 4 b are that three layers of H types stratum second layer change in depth differential conductance curve of transient electromagnetic collect under single pair number coordinate system
Figure.
Fig. 5 a be single pair number coordinate system under transient electromagnetic with half space change in resistance induced electromotive force curve summary view.
Fig. 5 b be single pair number coordinate system under transient electromagnetic with half space change in resistance differential conductance curve summary view.
Fig. 6 a are two layers of D types stratum first layer change in depth induced electromotive force congruence of curves of transient electromagnetic under single pair number coordinate system
Total figure.
Fig. 6 b are that two layers of D types stratum first layer change in depth differential conductance curve of transient electromagnetic collects under single pair number coordinate system
Figure.
Fig. 7 a are three layers of Q types stratum first layer change in depth induced electromotive force congruence of curves of transient electromagnetic under single pair number coordinate system
Total figure.
Fig. 7 b are that three layers of Q types stratum first layer change in depth differential conductance curve of transient electromagnetic collect under single pair number coordinate system
Figure.
Fig. 8 a are three layers of Q types stratum second layer change in depth induced electromotive force congruence of curves of transient electromagnetic under single pair number coordinate system
Total figure.
Fig. 8 b are that three layers of Q types stratum second layer change in depth differential conductance curve of transient electromagnetic collect under single pair number coordinate system
Figure.
Fig. 9 is transient electromagnetic data differential conductance means of interpretation flow chart.
Embodiment
Embodiments of the invention are further described below in conjunction with the accompanying drawings：
Differential conductance means of interpretation is that the induced electromotive force based on the acquisition of transient electromagnetic prospecting method is different in resistivity
The different means of interpretation of regional decay characteristics；Comprise the following steps that：
S1, Different Strata model designed according to electrical property difference, forward simulation is carried out to various stratigraphic models, and to obtained number
According to being collected.
In the S1 steps, to the different types of stratigraphic model of design in the case where keeping other factors constant, become
Change its certain Graph One factor and carry out forward simulation, and resulting transient electromagnetic data is subjected to Classifying Sum, specific steps include：
(1) homogeneous half space transient electromagnetic model, resistivity ρ, depth h, and h=∞ are designed, changes the big of ρ values
It is small, obtain multigroup homogeneous half space transient electromagnetic data, including period, time t and corresponding induced electromotive force value V；
(2) two layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；The second layer
Resistivity is ρ2, the second layer depth is h2=∞, changes ρ respectively1、h1、ρ2Size, obtain two layers of transient electromagnetic data of level,
Including period, time t and corresponding induced electromotive force value V；
(3) three layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；The second layer
Resistivity is ρ2, the second layer depth is h2；Third layer resistivity is ρ3, third layer depth is h3=∞, changes ρ respectively1、h1、ρ2、
h2、ρ3Size, obtain three layers of transient electromagnetic data of level, including period, time t and corresponding induced electromotive force value V.
The fluctuating situation for the curve that S2, observation transient electromagnetic differential conductance value change over time, obtains transient electromagnetic sensing
Electromotive force data, transient electromagnetic data is explained using differential conductance method.
In the S2 steps, differential conductance method, specific steps include：
S21, the cubic spline interpolation on time t is done to gained transient electromagnetic induced electromotive force value V, obtained more abundant
Transient electromagnetic data, ensure by differential conductance processing after curve obtained it is round and smooth as far as possible, the solution more conducively to data
Release；
S22, under log-log coordinate system, draw out the curve that transient electromagnetic induced electromotive force V changes with time t；
S23, according to differential conductance expression formula
Its differential conductance value K is asked with the time t curves changed to the induced electromotive force V under log-log coordinate system；
S24, the curve that differential conductance value K changes with time t, i.e. transient electromagnetic differential are drawn out under single pair number coordinate system
Conductance plots；
S25, same type of differential conductance value K is pooled to together with the curve that time t changes according to its changed factor
In one coordinate system, it is fabricated to and collects curve map；
When to three layers of H type Stratigraphic Curves, only changing its second layer depth h2, keep other specification it is constant, then its change because
Son is the second layer depth h2, the obtained curve map that collects is properly termed as three layers of H types stratum second layer change in depth differential conductance and converges
Master curve figure；
S26, according to transient electromagnetic differential conductance curve fluctuating situation, observing its extreme point position accurately can divide ground
Underground low-resistance anomalous body is found in bed boundary.
Embodiment 1：
The first step, numerical simulation, transient electromagnetic data needed for acquisition are carried out by transient electromagnetic forward simulation software；
Second step, the transient electromagnetic data obtained in the first step is arranged, for every group of data, the first row of data
Time t is classified as period, second, the 3rd is classified as induced electromotive force value V；
3rd step, change curves of the induced electromotive force value V on time t is drawn in log-log coordinate system；
4th step, to the curve obtained in the 3rd step, handled in differential conductance method, specific method is as follows：
Keep the curve shapes that change over time of induced electromotive force value V in Fig. 1 constant, curve respective coordinates value is taken pair
Number, then obtain the arithmetic coordinate of decile, such as referred to as coordinate transform, Fig. 2；
Its gradient is asked to the curve in Fig. 2 again, then its Grad is exactly required differential conductance value K.
5th step, in single pair number coordinate system (x-axis is logarithmic coordinates), draw out transient electromagnetic differential conductance value K at any time
Between the curve that changes, such as Fig. 3.
6th step, the curve that same type of induced electromotive force value V, differential conductance value K are changed with time t is according to it
Changed factor is pooled in the same coordinate system, is fabricated to and is collected curve map, such as Fig. 4 a, Fig. 4 b：To three layers of H type Stratigraphic Curves, only
Change changes its first layer depth h2, holding other specification is constant, then its changed factor is the second layer depth h2, obtain collecting song
Line chart, Fig. 4 a are properly termed as three layers of H types stratum second layer change in depth induced electromotive force and collect curve map, and Fig. 4 b are properly termed as three
Layer H types stratum second layer change in depth differential conductance collects curve map.
7th step, qualitative division is carried out to stratum according to the extreme point of curve, as two extreme values be present in the curve in Fig. 3,
Maximum is the line of demarcation of first layer and the second layer, and minimum is the line of demarcation of the second layer and third layer.
It is of the invention entirely different with existing transient electromagnetic data means of interpretation, with transient electromagnetic signal in resistivity differently
Area's attenuation degree is not all theoretical foundation, it is proposed that transient electromagnetic data differential conductance means of interpretation.
It is described above, it is only the embodiment of the present invention more for simplicity, protection scope of the present invention is not limited to
This, any one skilled in the art can become apparent within the technical scope of present disclosure
The simple change or equivalence replacement of this technology are each fallen within protection scope of the present invention.
Claims (1)
1. a kind of transient electromagnetic data differential conductance means of interpretation, it is characterized in that：Differential conductance means of interpretation is to be based on transient electrical
The induced electromotive force that magnetic prospecting method obtains is in the different means of interpretation of the different regional decay characteristics of resistivity；Specific steps are such as
Under：
S1, Different Strata model designed according to electrical property difference, forward simulation is carried out to various stratigraphic models, and data acquired entered
Row collects；
The fluctuating situation for the curve that S2, observation transient electromagnetic differential conductance value change over time, obtains transient electromagnetic induction electric
Gesture data, transient electromagnetic data is explained using differential conductance method；
, need to be to the different types of stratigraphic model of design in the case where keeping other factors constant in the S1 steps, change
Its certain Graph One factor carries out forward simulation, and resulting transient electromagnetic data is carried out into Classifying Sum, and specific steps include：
（1）Homogeneous half space transient electromagnetic model, resistivity ρ, depth h, and h=∞ are designed, changes the size of ρ values, is obtained
Multigroup homogeneous half space transient electromagnetic data, including period, time t and corresponding induced electromotive force value V；
（2）Two layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；Second layer resistance
Rate is ρ2, the second layer depth is h2=∞, changes ρ respectively1、h1、ρ2Size, obtain two layers of transient electromagnetic data of level, including point
Number, time t and corresponding induced electromotive force value V；
（3）Three layers of stratum transient electromagnetic model of design level, the first layer resistivity are ρ1, the first layer depth is h1；Second layer resistance
Rate is ρ2, the second layer depth is h2；Third layer resistivity is ρ3, third layer depth is h3=∞, changes ρ respectively1、h1、ρ2、h2、ρ3
Size, obtain three layers of transient electromagnetic data of level, including period, time t and corresponding induced electromotive force value V；
In the S2 steps, differential conductance method, specific steps include：
S21, the cubic spline interpolation on time t is done to gained transient electromagnetic induced electromotive force value V, obtain more abundant wink
Become electromagnetic data, ensure that curve obtained is round and smooth as far as possible after differential conductance processing, the explanation more conducively to data；
S22, under log-log coordinate system, draw out the curve that transient electromagnetic induced electromotive force V changes with time t；
S23, the committed step of differential conductance processing is carried out to transient electromagnetic data to ask for transient electromagnetic differential conductance value K, table
It is up to formula：
Its differential conductance value K is asked with the time t curves changed to the induced electromotive force V under log-log coordinate system；
S24, the curve that differential conductance value K changes with time t, i.e. transient electromagnetic differential conductance are drawn out under single pair number coordinate system
Curve；
S25, same type of differential conductance value K is pooled to same seat with the curve that time t changes according to its changed factor
In mark system, it is fabricated to and collects curve map；
When to three layers of H type Stratigraphic Curves, only changing its second layer depth h2, keep other specification constant, then its changed factor is the
Two layer depth h2, the obtained curve map that collects is properly termed as three layers of H types stratum second layer change in depth differential conductance and collects curve
Figure；
S26, according to transient electromagnetic differential conductance curve fluctuating situation, ground stratum boundary can accurately be divided by observing its extreme point position
Underground low-resistance anomalous body is found in face.
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| CN106405665B (en) * | 2016-11-18 | 2018-09-28 | 厦门大学 | Transient electromagnetic conductivity inversion method based on DBIM |
| CN106772644B (en) * | 2016-12-14 | 2018-06-26 | 中国矿业大学 | mine transient electromagnetic three-component detection method |
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