CN105467460B - electromagnetic exploration method and device - Google Patents
electromagnetic exploration method and device Download PDFInfo
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- CN105467460B CN105467460B CN201510998309.9A CN201510998309A CN105467460B CN 105467460 B CN105467460 B CN 105467460B CN 201510998309 A CN201510998309 A CN 201510998309A CN 105467460 B CN105467460 B CN 105467460B
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- 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
- G01V3/36—Recording data
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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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Abstract
The invention provides a kind of electromagnetic exploration method and device, wherein, this method includes：The both sides of two-dimentional survey line in the wide line area of observation coverage, lay parallel survey line, wherein, parallel survey line is between the first excitaton source and the second excitaton source；First excitaton source is excited, the first signal that the first measuring point on two-dimentional survey line is observed is obtained, obtains the secondary signal that the second measuring point corresponding with the first measuring point is observed on parallel survey line；Second excitaton source is excited, obtains the 3rd signal that the first measuring point is observed, and the 4th signal that the second measuring point is observed；Signal weighting superposition is carried out to the first signal and secondary signal, signal weighting superposition is carried out to the 3rd signal and the 4th signal, the single-point single observation signal respectively as the first excitaton source and the second excitaton source to the first measuring point.The observation data accuracy that the present invention is solved present in electromagnetic exploration method of the prior art is not high, it is impossible to the effectively technical problem of monitoring side information.
Description
Technical field
The present invention relates to technical field of geological exploration, more particularly to a kind of electromagnetic exploration method and device.
Background technology
Land controllable source electromagnetic prospecting is excited using artificial field source so as to obtain a kind of method of subsurface information
General designation, such method due to depth of exploration is big, vertically and horizontally high resolution and be widely used in geologic prospecting, oil-gas exploration,
Underground heat, metalliferous deposit, the hydrology, environment etc..
Further, it is contemplated that in the low complex area of complex geologic conditions, interference development, signal to noise ratio, three-dimensional exploration cost
It is high and effective operation can not be carried out sometimes, therefore, tradition using long wire as excitaton source electromagnetic prospecting (such as：Transient electrical
Magnetic method, artificial source's audio-frequency magnetotelluric magnetic method etc.) observed pattern that is once covered using unilateral and single field source single-shot more, this
The mode of the two dimension collection of kind single line cannot get any side-information, therefore be unfavorable for final inversion imaging.
Meanwhile the collection of land controllable source electromagnetic data at present is more using the acquisition station combination side arranged along line direction
Formula, this mode mainly suppress the primary rule interference propagated along line direction and random disturbances, and for cross line direction
, strong secondary disturbances can not then play effective inhibitory action.In addition field source shadow effect (including field source print-through) etc.
Presence, it is easy to cause to observe error in data, information not comprehensively, the generation for the problems such as signal to noise ratio is undesirable, and then after influenceing
The reliability of phase data interpretation.
It is not high for the observation data accuracy present in existing electromagnetic exploration method, it is impossible to effectively monitoring side information
The problems such as, effective solution is not yet proposed at present.
The content of the invention
The embodiments of the invention provide a kind of electromagnetic exploration method, to solve the sight present in existing electromagnetic exploration method
It is not high to survey data accuracy, it is impossible to which the problems such as effectively monitoring side information, this method includes：
The both sides of two-dimentional survey line in the wide line area of observation coverage, lay parallel survey line, wherein, the parallel survey line swashs positioned at first
Rise between the second excitaton source；
First excitaton source is excited, obtains the first letter that the first measuring point on the two-dimentional survey line is observed
Number, obtain the secondary signal that the second measuring point corresponding with first measuring point is observed on the parallel survey line；
Second excitaton source is excited, obtains the 3rd signal that first measuring point is observed, and described the
The 4th signal that two measuring points are observed；
Signal weighting superposition is carried out to first signal and the secondary signal, as first excitaton source to described
The single-point single observation signal of first measuring point；
Signal weighting superposition is carried out to the 3rd signal and the 4th signal, as second excitaton source to described
The single-point single observation signal of first measuring point.
In one embodiment, in the wide line area of observation coverage two-dimentional survey line both sides, lay parallel survey line, including：
The both sides of two-dimentional survey line in the wide line area of observation coverage, symmetrically lay a plurality of parallel survey line.
In one embodiment, the wide line area of observation coverage determines in such a way：
Effectively transmitting-receiving is obtained away from scope；
The effectively transmitting-receiving away from maximum and is received and dispatched away from the difference between minimum value away from the transmitting-receiving in scope, as described
The length of side of the wide line area of observation coverage perpendicular to the two-dimentional line direction；
The length of side of the wide line area of observation coverage parallel to the two-dimentional line direction is determined according to geological structure and geological tasks；
Put down with the wide line area of observation coverage of determination perpendicular to the length of side of the two-dimentional line direction and the wide line area of observation coverage
The region that row is limited in the section that the length of side of the two-dimentional line direction is limited as the wide line area of observation coverage.
In one embodiment, excited to second excitaton source, obtain first measuring point and observed
The 3rd signal after, methods described also includes：
Source effects are determined whether there is according to first signal and the 3rd signal.
In one embodiment, Source effects are determined whether there is according to first signal and the 3rd signal,
Including：
When the difference between first signal and the 3rd signal is more than predetermined threshold, it is determined that field source effect be present
Should.
In one embodiment, first excitaton source and second excitaton source be parallel to the two-dimentional survey line, and
First excitaton source to the distance between the two-dimentional survey line and second excitaton source between the two-dimentional survey line away from
From equal.
The embodiment of the present invention additionally provides a kind of electromagnetic survey device, to solve present in existing electromagnetic exploration method
It is not high to observe data accuracy, it is impossible to which the problems such as effectively monitoring side information, the device includes：
Module is laid, for the both sides of the two-dimentional survey line in the wide line area of observation coverage, lays parallel survey line, wherein, it is described parallel
Survey line is between the first excitaton source and the second excitaton source；
First excitation module, for being excited to first excitaton source, obtain the first survey on the two-dimentional survey line
The first observed signal of point, obtain what the second measuring point corresponding with first measuring point on the parallel survey line was observed
Secondary signal；
Second excitation module, for being excited to second excitaton source, obtain what first measuring point was observed
3rd signal, and the 4th signal that second measuring point is observed；
First computing module, for carrying out signal weighting superposition to first signal and the secondary signal, as institute
State single-point single observation signal of first excitaton source to first measuring point；
Second computing module, for carrying out signal weighting superposition to the 3rd signal and the 4th signal, as institute
State single-point single observation signal of second excitaton source to first measuring point.
In one embodiment, the module of laying is specifically for two of the two-dimentional survey line in the wide line area of observation coverage
Side, symmetrically lay a plurality of parallel survey line.
In one embodiment, said apparatus also includes：Wide survey line area of observation coverage determining module, the wide survey line area of observation coverage are true
Cover half block includes：
Acquiring unit, for obtaining effectively transmitting-receiving away from scope；
Vertical length of side determining unit, for the effectively transmitting-receiving away from maximum and to be received and dispatched away from minimum away from the transmitting-receiving in scope
Difference between value, the length of side as the wide line area of observation coverage perpendicular to the two-dimentional line direction；
Parallel length of side determining unit, for determining the wide line area of observation coverage parallel to institute according to geological structure and geological tasks
State the length of side of two-dimentional line direction；
Area determination unit, for the wide line area of observation coverage of determination perpendicular to the two-dimentional line direction the length of side,
With the wide line area of observation coverage parallel to the section that the length of side of the two-dimentional line direction is limited as the wide line area of observation coverage institute
The region of restriction.
In one embodiment, said apparatus also includes：Field source determining module, for entering to second excitaton source
Row excites, after obtaining the 3rd signal that first measuring point is observed, according to first signal and the 3rd signal
Determine whether there is Source effects.
In embodiments of the present invention, parallel survey line has been laid in the both sides of two-dimentional survey line in the wide line area of observation coverage, then replaces
The first excitaton source and the second excitaton source are excited, signal that the observation station on two-dimentional survey line is observed and corresponding with the observation station
The list that the weighted superposition value for the signal that observation station on parallel survey line observes is observed as the observation station of the two-dimentional survey line
The unilateral observation signal of point, the observation signal so obtained take into account side information so that data are more accurate, so as to have
The observation data accuracy that effect is solved present in electromagnetic exploration method of the prior art is not high, it is impossible to effectively monitoring side information
Technical problem, reached improve data accuracy, improve signal signal to noise ratio technique effect, entered by these observation signals
The processing such as the follow-up superposition of row, filtering, inverting are more accurate.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, not
Form limitation of the invention.In the accompanying drawings：
Fig. 1 is the method flow diagram of electromagnetic exploration method according to embodiments of the present invention；
Fig. 2 is the schematic device of electromagnetic survey field arrangement according to embodiments of the present invention；
Fig. 3 is the structured flowchart of electromagnetic survey device according to embodiments of the present invention.
Embodiment
It is right with reference to embodiment and accompanying drawing for the object, technical solutions and advantages of the present invention are more clearly understood
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate to be used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Inventor consider existing electromagnetic exploration method present in data inaccuracy the problems such as main cause be exactly because
It is that one side excites, so that side-information can not be obtained effectively, can not also weakens interference and influence in vertical direction
Deng.Therefore, inventor expects setting excitaton source in the both sides of two-dimentional survey line, and an emphasis area of observation coverage is chosen,
Signal detection is carried out in the parallel parallel survey line of the laying of the both sides of the two-dimentional survey line of this emphasis area of observation coverage, so as to improve data
Accuracy.
In this example, there is provided a kind of electromagnetic exploration method, as shown in figure 1, comprising the following steps：
Step 101：The both sides of two-dimentional survey line in the wide line area of observation coverage, lay parallel survey line, wherein, the parallel survey line position
Between the first excitaton source and the second excitaton source；
Step 102：First excitaton source is excited, the first measuring point obtained on the two-dimentional survey line is observed
The first signal, obtain the secondary signal that the second measuring point corresponding with first measuring point is observed on the parallel survey line；
Step 103：Second excitaton source is excited, obtains the 3rd signal that first measuring point is observed,
The 4th signal observed with second measuring point；
Step 104：Signal weighting superposition is carried out to first signal and the secondary signal, excited as described first
Single-point single observation signal of the source to first measuring point；
Step 105：Signal weighting superposition is carried out to the 3rd signal and the 4th signal, excited as described second
Single-point single observation signal of the source to first measuring point.
In the above-described embodiments, parallel survey line has been laid in the both sides of two-dimentional survey line in the wide line area of observation coverage, then alternately swashs
The first excitaton source and the second excitaton source are sent out, signal that the observation station on two-dimentional survey line is observed and corresponding with the observation station flat
The single-point that the weighted superposition value for the signal that observation station on row survey line observes is observed as the observation station of the two-dimentional survey line
Unilateral observation signal, the observation signal so obtained take into account side information so that data are more accurate, so as to effective
The observation data accuracy solved present in electromagnetic exploration method of the prior art is not high, it is impossible to effectively monitors side information
Technical problem, reached improve data accuracy, improve signal signal to noise ratio technique effect, carried out by these observation signals
The processing such as follow-up superposition, filtering, inverting are more accurate.
Above-mentioned the first excitaton source and the second excitaton source can be electrical long wire source, can be set in parallel in two-dimentional survey line
Both sides, in order that observation signal has more referential, it is ensured that the distance between first excitaton source to two-dimentional survey line and the
Two excitaton sources are equal to the distance between two-dimentional survey line.
When specific implementation, parallel survey line can symmetrically be laid in two-dimentional survey line both sides, can be surveyed in two dimension
A parallel survey line is laid in every side in the both sides of line, can also lay a plurality of parallel survey line in every side, that specifically lays is parallel
The quantity of survey line can be chosen according to actual demand, and the application is not construed as limiting to this.
The scope of the wide line area of observation coverage in upper example can determine according to following steps：
S1：Effectively transmitting-receiving is obtained away from scope；
S2：The effectively transmitting-receiving away from maximum and is received and dispatched away from the difference between minimum value away from the transmitting-receiving in scope, as
The length of side of the wide line area of observation coverage perpendicular to the two-dimentional line direction；
S3：Side of the wide line area of observation coverage parallel to the two-dimentional line direction is determined according to geological structure and geological tasks
It is long；
S4：Observed with the wide line area of observation coverage of determination perpendicular to the length of side of the two-dimentional line direction and the wide line
The region that area is limited parallel to the section that the length of side of the two-dimentional line direction is limited as the wide line area of observation coverage.
, can be to two on two-dimentional survey line is obtained after observation signal of the measuring point based on the first excitaton source and the second excitaton source
The signal of the front and rear record of dimension survey line observation station is analyzed, and tentatively to judge that Source effects whether there is, and can enter
One step determines the property of anomalous body between field source and observation station, for example, determining that the anomalous body is post non of low resistance body or high resistance body.That is,
It can be excited to the second excitaton source, after obtaining the 3rd signal that the first measuring point is observed, according to the described first letter
Number and the 3rd signal determine whether there is Source effects.That is, it can be observed according to the measuring point on two-dimentional survey line
Two observation signals excited after source excitation, it is determined whether Source effects be present, if anomalous body be present.
For example, if having anomalous body in the side close to the first emission source, then the first transmitting that survey line detects
There will be difference between the signal for the second emission source that the signal and survey line in source detect, if the first transmitting that survey line detects
The signal in source is more than the signal for the second emission source that survey line detects, then it is high resistance body that can illustrate anomalous body, if survey line is examined
The signal of the first emission source measured is less than the signal for the second emission source that survey line detects, then it is low-resistance that can illustrate anomalous body
Body.
Present invention also offers a specific embodiment to illustrate to above-mentioned electromagnetic exploration method, but is worth noting
, the specific embodiment do not form inappropriate limitation of the present invention merely to the present invention is better described.
Mainly consider for single line two dimension acquisition mode, because cross line direction obtains, information is less, disturbs
Less than the presence of suppression, the in addition unfavorable factor such as Source effects (including field source print-through), cause to observe data inaccuracy, letter
Breath is not complete, and existing traditional Field survey layout can not effectively meet to improve degree of covering, the ability of enhancing compacting random noise
It is required that and land controllable source electromagnetic method three-dimensional acquisition it is less efficient, post-processing technique is immature.In this example, it is proposed that one
The observation acquisition method of kind land controllable source electromagnetic prospecting, be excited using the electrically long wire source of bilateral, highest priority
Area sets the wide line region to be observed, so as to obtain the electromagnetic exploration method of high-precision electromagnetic data, this example by it is bilateral excite,
Target area sets the acquisition mode between two dimension and three-dimensional of the wide line area of observation coverage, effectively improves degree of covering, expands electromagnetism
Response message amount, improve superposition signal to noise ratio.
As shown in Fig. 2 to realize exploration device schematic diagram that the electromagnetic exploration method that this example provided is laid, surveyed based on this
Device progress electromagnetic survey is visited to may comprise steps of：
S1：Collect the data such as the geology in target work area, geophysics, drilling well, physical property, structure geophysics (electric) model
Forward simulation is carried out, it is determined that reasonably receiving and dispatching away from scope.
Specifically, effective stimulating frequency section can substantially be determined with skin depth formula, one to be received and dispatched away from D integral pin-fin tube
Simulation, determines reasonably to receive and dispatch away from scope.
S2：Set the length of side (l of the wide line area of observation coverage perpendicular to two-dimentional line directionv) be equal to rationally transmitting-receiving away from maximum with
The difference of minimum value, parallel to the length of side (l of two-dimentional line directionh) determined by geological structure and the geological tasks of target area.
For example, the reasonable transmitting-receiving determined is away from scope：8km to 12km, then lv=4km.
Further, the parallel survey line in the wide line area of observation coverage can be distributed with two-dimentional survey line axial symmetry, and with away from two
Survey line line-spacing is tieed up to increase, line-spacing should be greater than a little away from.
S3：The parallel survey line of the wide line area of observation coverage is parallel with two-dimentional survey line, and with two-dimentional survey line axial symmetry.Laying when
Wait, if laying a plurality of parallel survey line, the line-spacing between parallel survey line is more preferably greater than point away from and with away from two-dimentional survey line line
Big away from becoming, the observation station of the wide line area of observation coverage once deploys；Electrically long wire excitaton source, two dimension are arranged in two-dimentional survey line both sides
Observation station preferably once deploys in survey line observation station and the wide line area of observation coverage.
S4：The long wire excitaton source (emission source 1 and emission source 2) of two-dimentional survey line both sides arrangement alternately excites, each observation
Observational record excitation response signal twice is put, excites the observation station on two-dimentional survey line and the measuring point in the wide line area of observation coverage every time simultaneously
Record.
S5：The signal recorded before and after two-dimentional survey line observation station is analyzed and (that is, seen on comparative analysis two dimension survey line
The signal that measuring point gathers twice), tentatively judge that Source effects whether there is, and determine the property of anomalous body between field source and observation station
Matter, that is, determine that anomalous body is post non of low resistance body or high resistance body.
If with the presence of anomalous body between field source and observation station, then will have Source effects, if in field source and
There is no anomalous body presence between observation station, would not typically produce Source effects.It is determined that, it is necessary to first before the property of anomalous body
It is determined that containing anomalous body in which side of two-dimentional survey line, this determination process can be determined by the way of assuming to simulate, i.e. false
Being located at side has anomalous body, then simulation has the state that detection signal should show in the case of anomalous body, and if observation station
The signal observed is consistent or coincide substantially, then may indicate that hypothesis is correct.
Observation station on two-dimentional survey line excite twice obtain signal it is morphologically similar, numerical value is variant, if adjacent
The signal of multiple observation station records numerically differs greatly, then is considered as electric characteristic abnormality between excitaton source and observation station being present
Body.
S6：The letter observed to the observation station on two-dimentional survey line with corresponding to the observation station on parallel survey line in the wide line area of observation coverage
Number superposition is weighted, so as to form the signal of single-point single observation, i.e. by vertical right with two-dimentional survey line in the wide line area of observation coverage
The numerical value obtained after the signal weighting superposition for the observation station record answered replaces the observation station record on two-dimentional survey line.
Specifically, used weight coefficient can obtain by the way of advance simulation calculates when weighted superposition, i.e.,
The weight coefficient of two-dimentional survey line survey line parallel with every is determined by the way of simulation.
S7：Conventional qualitative and quantitative Treatment is carried out to the signal after above-mentioned processing.
Wherein, so-called routinely processing can include：Superposition, filtering, denoising etc. are handled, and quantitative Treatment can include：Instead
Drill processing etc..
In upper example, excited using in two-dimentional survey line both sides, so as to be illuminated from both direction to geologic body, together
When add observation station degree of covering, expand the information content of electromagnetic response, improve the signal to noise ratio of data-signal, comparative analysis
The signal of observation is excited twice, and eliminating Source effects for research provides foundation.In highest priority area, the wide line area of observation coverage is set,
Parallel survey line of arrangement, superposition is weighted to observed result in it, so as to then be risen to cross line direction, strong secondary disturbances
To effective inhibitory action, signal to noise ratio is improved, improves gathered data quality, explains and is provided reliably, comprehensively for post-processing
Data information.
Based on same inventive concept, a kind of electromagnetic survey device is additionally provided in the embodiment of the present invention, such as following implementation
Described in example.It is similar to electromagnetic exploration method to solve the principle of problem due to electromagnetic survey device, therefore the reality of electromagnetic survey device
The implementation that may refer to electromagnetic exploration method is applied, part is repeated and repeats no more.It is used below, term " unit " or " mould
Block " can realize the combination of the software and/or hardware of predetermined function.Although the device described by following examples is preferably with soft
Part is realized, but hardware, or software and hardware combination realization and may and be contemplated.Fig. 3 is of the invention real
A kind of structured flowchart of the electromagnetic survey device of example is applied, can be included as shown in Figure 3：Lay module 301, the first excitation module
302nd, the second excitation module 303, the first computing module 304 and the second computing module 305, are illustrated to the structure below.
Module 301 is laid, for the both sides of the two-dimentional survey line in the wide line area of observation coverage, lays parallel survey line, wherein, it is described flat
Row survey line is between the first excitaton source and the second excitaton source；
First excitation module 302, for being excited to first excitaton source, obtain first on the two-dimentional survey line
The first signal that measuring point is observed, obtain the second measuring point corresponding with first measuring point on the parallel survey line and observed
Secondary signal；
Second excitation module 303, for being excited to second excitaton source, obtain first measuring point and observed
The 3rd signal, and the 4th signal that second measuring point is observed；
First computing module 304, for carrying out signal weighting superposition to first signal and the secondary signal, as
Single-point single observation signal of first excitaton source to first measuring point；
Second computing module 305, for carrying out signal weighting superposition to the 3rd signal and the 4th signal, as
Single-point single observation signal of second excitaton source to first measuring point.
In one embodiment, lay module 301 and specifically can be used for the two-dimentional survey line in the wide line area of observation coverage
Both sides, symmetrically lay a plurality of parallel survey line.
In one embodiment, above-mentioned electromagnetic survey device can also include：Wide survey line area of observation coverage determining module, the width
Survey line area of observation coverage determining module can include：Acquiring unit, for obtaining effectively transmitting-receiving away from scope；Vertical length of side determining unit,
For the effectively transmitting-receiving away from maximum and to be received and dispatched away from the difference between minimum value away from the transmitting-receiving in scope, as the wide line
The length of side of the area of observation coverage perpendicular to the two-dimentional line direction；Parallel length of side determining unit, for being appointed according to geological structure and geology
Business determines the length of side of the wide line area of observation coverage parallel to the two-dimentional line direction；Area determination unit, for the institute of determination
The wide line area of observation coverage is stated perpendicular to the length of side of the two-dimentional line direction and the wide line area of observation coverage parallel to the two-dimentional survey line side
To the region that is limited as the wide line area of observation coverage of the section that is limited of the length of side.
In one embodiment, above-mentioned electromagnetic survey device can also include：Field source determining module, for described
Second excitaton source is excited, after obtaining the 3rd signal that first measuring point is observed, according to first signal and
3rd signal determines whether there is Source effects.
As can be seen from the above description, the embodiment of the present invention realizes following technique effect：In the wide line area of observation coverage
Parallel survey line has been laid in the both sides of two-dimentional survey line, then alternately the first excitaton source and the second excitaton source is excited, by two-dimentional survey line
The signal that observes of observation station and with the observation station corresponding to the weighting of signal that observes of observation station on parallel survey line fold
The single-point one side observation signal that the value added observation station as the two-dimentional survey line is observed, the observation signal so obtained are considered
Side information so that data are more accurate, so as to effectively solve present in electromagnetic exploration method of the prior art
It is not high to observe data accuracy, it is impossible to the effectively technical problem of monitoring side information, reached raising data accuracy, improved letter
Number signal to noise ratio technique effect, it is more accurate to carry out the processing such as follow-up superposition, filtering, inverting by these observation signals.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
Realized with general computing device, they can be concentrated on single computing device, or are distributed in multiple computing devices
On the network formed, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and performed in the storage device by computing device, and in some cases, can be to be held different from order herein
They, are either fabricated to each integrated circuit modules or will be multiple in them by the shown or described step of row respectively
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. electromagnetic exploration method, it is characterised in that including：The both sides of two-dimentional survey line in the wide line area of observation coverage, lay parallel survey line, wherein, the parallel survey line is located at the first excitaton source And second between excitaton source；First excitaton source is excited, obtains the first signal that the first measuring point on the two-dimentional survey line is observed, Obtain the secondary signal that the second measuring point corresponding with first measuring point is observed on the parallel survey line；Second excitaton source is excited, obtains the 3rd signal that first measuring point is observed, and described second surveys The 4th observed signal of point；Signal weighting superposition is carried out to first signal and the secondary signal, as first excitaton source to described first The single-point single observation signal of measuring point；Signal weighting superposition is carried out to the 3rd signal and the 4th signal, as second excitaton source to described first The single-point single observation signal of measuring point.
- 2. the method as described in claim 1, it is characterised in that the both sides of two-dimentional survey line in the wide line area of observation coverage, lay parallel Survey line, including：The both sides of two-dimentional survey line in the wide line area of observation coverage, symmetrically lay a plurality of parallel survey line.
- 3. method as claimed in claim 1 or 2, it is characterised in that the wide line area of observation coverage determines in such a way：Effectively transmitting-receiving is obtained away from scope；The effectively transmitting-receiving away from maximum and is received and dispatched away from the difference between minimum value away from the transmitting-receiving in scope, as the wide line The length of side of the area of observation coverage perpendicular to the two-dimentional line direction；The length of side of the wide line area of observation coverage parallel to the two-dimentional line direction is determined according to geological structure and geological tasks；With the wide line area of observation coverage of determination perpendicular to the two-dimentional line direction the length of side and the wide line area of observation coverage parallel to The region that the section that the length of side of the two-dimentional line direction is limited is limited as the wide line area of observation coverage.
- 4. method as claimed in claim 1 or 2, it is characterised in that excited to second excitaton source, described in acquisition After the 3rd signal that first measuring point is observed, methods described also includes：Source effects are determined whether there is according to first signal and the 3rd signal.
- 5. method as claimed in claim 4, it is characterised in that determined whether according to first signal and the 3rd signal Source effects be present, including：When the difference between first signal and the 3rd signal is more than predetermined threshold, it is determined that Source effects be present.
- 6. method as claimed in claim 1 or 2, it is characterised in that first excitaton source is parallel with second excitaton source In the two-dimentional survey line, and described in first excitaton source arrived to the distance between the two-dimentional survey line and second excitaton source The distance between two-dimentional survey line is equal.
- A kind of 7. electromagnetic survey device, it is characterised in that including：Module is laid, for the both sides of the two-dimentional survey line in the wide line area of observation coverage, lays parallel survey line, wherein, the parallel survey line Between the first excitaton source and the second excitaton source；First excitation module, for being excited to first excitaton source, obtain the first measuring point institute on the two-dimentional survey line The first signal observed, obtain that the second measuring point corresponding with first measuring point is observed on the parallel survey line second Signal；Second excitation module, for being excited to second excitaton source, obtain the first measuring point is observed the 3rd Signal, and the 4th signal that second measuring point is observed；First computing module, for carrying out signal weighting superposition to first signal and the secondary signal, as described the Single-point single observation signal of one excitaton source to first measuring point；Second computing module, for carrying out signal weighting superposition to the 3rd signal and the 4th signal, as described the Single-point single observation signal of two excitaton sources to first measuring point.
- 8. device as claimed in claim 7, it is characterised in that the laying module is specifically used in the wide line area of observation coverage The both sides of two-dimentional survey line, symmetrically lay a plurality of parallel survey line.
- 9. device as claimed in claim 7 or 8, it is characterised in that also include：Wide survey line area of observation coverage determining module, the width are surveyed Line area of observation coverage determining module includes：Acquiring unit, for obtaining effectively transmitting-receiving away from scope；Vertical length of side determining unit, for by the effectively transmitting-receiving away from the transmitting-receiving in scope away from maximum and transmitting-receiving away from minimum value it Between difference, the length of side as the wide line area of observation coverage perpendicular to the two-dimentional line direction；Parallel length of side determining unit, for determining the wide line area of observation coverage parallel to described two according to geological structure and geological tasks Tie up the length of side of line direction；Area determination unit, for the length of side and institute of the wide line area of observation coverage of determination perpendicular to the two-dimentional line direction The wide line area of observation coverage is stated to be limited as the wide line area of observation coverage parallel to the section that the length of side of the two-dimentional line direction is limited Region.
- 10. device as claimed in claim 7 or 8, it is characterised in that also include：Field source determining module, for being excited to second excitaton source, obtain that first measuring point observed the After three signals, Source effects are determined whether there is according to first signal and the 3rd signal.
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| CN109884714B (en) * | 2019-03-05 | 2021-11-16 | 中国地质科学院地球物理地球化学勘查研究所 | Controllable source electromagnetic measurement method, device and storage medium thereof |
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