CN108919361A - A kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction - Google Patents
A kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction Download PDFInfo
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- CN108919361A CN108919361A CN201810888992.4A CN201810888992A CN108919361A CN 108919361 A CN108919361 A CN 108919361A CN 201810888992 A CN201810888992 A CN 201810888992A CN 108919361 A CN108919361 A CN 108919361A
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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
- G01V3/08—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
- G01V3/081—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 the magnetic field is produced by the objects or geological structures
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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
Abstract
A kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction.This method acquires the natural electric field frequency domain signal of some known ground particle using a measurement natural electric field equipment, in other measuring points using another measurement natural electric field equipment using the natural electric field frequency domain signal of multiple frequencies of the multiple directions on circular pattern acquisition measuring point, selection mutually in the same time, the progress ratio conversion of the natural electric field frequency domain signal of other measuring points of identical frequency and known ground particle, annular three-dimensional exploration results are obtained, to realize the random variation for rejecting natural electric field signal and interference, the purpose for improving exploration effects, identification underground fluid flow direction.
Description
Technical field
The present invention relates to a kind of frequency domain natural electric field annulars of the identification underground fluid flow direction in Key words exploration geophysics field
Three-dimensional exploitation method.
Background technique
There is a kind of frequency selection method that geological prospecting is carried out using measurement natural electric field in electrical prospecting.This method uses two
The measuring electrode of ground connection directly measures the electric field signal intensity of the natural electric field different frequency of the earth, without measuring the day of the earth
Right magnetic field, without arrangement artificial electric field, therefore the working efficiency of this method is higher, exploration cost is low, anti-human message magnetic disturbance energy
Power is strong, has obvious advantage in geological prospecting.But the driving source of the natural electric field signal due to forming the earth is not
Be it is stable, not only the signal strength of the driving source of different frequency is different, even the signal strength of the driving source of identical frequency
Also it can vary over, therefore the natural electric field signal strength of the identical frequency of different moments acquisition is different；Separately due to people
Literary electric jamming changes also with the time；If the natural electric field data obtained to different moments are directly interpreted, can
Since the excitation source signal intensity of different moments is different with humane electric jamming, the natural electric field data for causing different moments to obtain
Comparativity reduces, to influence the exploration effects of this method.This is also frequency selection method at present more as qualitative exploration early period
Main cause.
For the flow direction of underground fluid under identification measuring point, currently used annular exploitation method is used centered on measuring point,
It is arranged symmetrically the measuring electrode of multiple directions, and the natural electric field signal for measuring different frequency between symmetrical measuring electrode is strong
Degree, the natural electric field signal strength by analyzing different directions judge the flow direction of underground fluid under measuring point.Due to using
The measuring electrode being arranged symmetrically relative to measuring point, therefore carry out annular three-dimensional polarization diagram draw when, the letter of two symmetry directions
Number intensity is identical, therefore in the interpretation of later period achievement, and for the flow direction judgement of underground fluid, there are following Railway Projects：1,
At least there are two solutions for flow direction judgement, that is, all there may be and one underground fluids from the flowing of two symmetry directions
Direction only one；If 2, the flow direction of underground fluid changes, can not judge from the achievement of existing exploration mode；3,
If underground fluid is easy to make there are the difficulty for when multiply, more increasing existing annular exploration results and judging the flow direction of underground fluid
At the judgement of mistake；4, since the time of measuring of different directions is different, and the driving source of natural electric field, various humane electric jammings
It varies over etc. being, if in the result of some orientation measurement including excessive natural electric field driving source and various humanities
Electric jamming, the then comparativity that will lead to the natural electric field measurement data of different directions reduce, and further decrease surveying accuracy.
Based on the above problem present in current natural electric field annular three-dimensional method, for the exploration effects for improving this method,
Therefore propose a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction.
Summary of the invention：
The purpose of the present invention is based on judging that precision is lower, natural electricity for underground fluid flow direction present in existing frequency selection method
The problems such as field signal comparativity is low, exploration effects are poor proposes a kind of frequency domain natural electric field ring of identification underground fluid flow direction
Shape three-dimensional exploitation method improves the judgement precision of underground fluid flow direction, reduces different moments since the driving source of natural electric field is believed
Number and the humane changed influence of electric field, to finally improve the surveying accuracy and effect of natural electric field.
A kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction, specific step is as follows：
A) selection is required according to exploration purpose, exploration and sets the measurement frequency of the electrical method equipment of all measurement natural electric fields
Rate quantity and frequency values, the number of frequencies for measuring natural electric field are no less than 2；The electrical method equipment of measurement natural electric field is no less than
2, and consistency check is carried out to all electrical method equipment, obtain the System level gray correlation between instrument；Number of frequencies is more, surveying accuracy
It is higher；It can according to the frequency data that the combined factors selection selection such as specific exploration requirements, difficulties in exploration needs to measure and specifically
Numerical value.
B) measurement is laid naturally in the known point that choice of prospective area for exploration geological condition is of substantially known, humane electric jamming is small
The electrical method equipment of electric field measures the natural electric field signal of some period different frequency of known point according to fixed time interval,
And range normalization processing is carried out to the natural electric field signal using two measuring electrode distances of known point, it obtains apart from normalizing
Change the natural electric field time series data U of some period different frequency of treated known point0(t, f), wherein t is measurement day
The acquisition moment of right electric field, f are the frequency values of natural electric field；The selection of known point can be in conjunction with the geology of early period etc.
Achievement is selected, the electrical method equipment for the place arrangement known point that selection geological condition is simple as far as possible, stratum is stable, interference is small；
The time interval of measurement can be selected according to the storage size of instrument, how many, the surveying accuracy requirement of field measuring point etc.；
Record the measuring electrode MN distance of electrical method equipment；For improve known point natural electric field signal stabilization, using unpolarizable electrode
As measuring electrode；The electricity of the measurement natural electric field of the running parameter and measuring point of the electrical method equipment of the measurement natural electric field of known point
Method equipment is identical, but the time interval of data acquisition can be different；The time of measuring range of the measurement natural electric field of known point is complete
The time of measuring range of the measurement natural electric field of all standing measuring point.
C) to the natural electric field signal time sequence data U of the different frequency of step b) known point collected0(t, f),
The interpolation for carrying out time, natural electric field amplitude to time series data using interpolation method, obtains the different frequency of known point
The time series data U of natural electric field signal after interpolationC(t,f)；The preferable Quadratic Spline Interpolation of data interpolating method, glug
The methods of bright day interpolation；Result after interpolation, which is subject to, does not change primitive curve general morphology.
D) it needs to carry out in exploration area and lays a public-measurement electrode on the measuring point of measurement, in the different directions of measuring point
Other measuring electrodes are laid apart from measuring point certain distance, a measuring electrode is laid in each direction；The record point in each direction is sat
Mark is set as arranging the center point coordinate between the measuring electrode on the measuring point and respective direction of public-measurement electrode；Using another
Platform measures the different frequency between the electrical method device measuring public-measurement electrode and the measuring electrode of different directions of natural electric field
Natural electric field signal and record acquisition moment, and range normalization processing is carried out to the signal using corresponding measuring electrode distance,
Obtain range normalization treated the natural electric field time series data U of different record points, different frequencyn(t, f), wherein n
The number of different record points is represented, t is the acquisition moment for measuring natural electric field, and f is the frequency values of natural electric field；To obtain
The natural electric field data measurement of the different frequency of difference record point；It can be using the electricity of more or one measurement natural electric fields
Method device measuring natural electric field data；To improve exploration effects, consistency is carried out to the electrical method equipment of all measurement natural electric fields
Measurement obtains the System level gray correlation between distinct device；The electrical method equipment that natural electric field is measured selected by the step uses copper electrode
Working efficiency is improved as measuring electrode to reduce field work difficulty；The electrical method equipment of the measurement natural electric field of the step
Running parameter it is identical with the running parameter of electrical method equipment of the natural electric field of known point；The measurement natural electric field of measuring point
Time of measuring range is completely contained within the scope of the time of measuring of measurement natural electric field of known point.
E) measuring electrode of measuring point different directions in d) is changed the step at a distance from public-measurement electrode, public-measurement electrode
Position it is constant, the record point setting coordinate in each direction be to arrange that the measuring point of public-measurement electrode and measurement in this direction are electric
Center point coordinate between pole；It is acquired between different directions measuring electrode and public-measurement electrode again in the way of step d)
Different frequency natural electric field time series data, thus obtain it is different record point natural electric field data measurements；Directly
To the DATA REASONING for completing all record points.
F) after the natural electric field signal acquisition work on all record points of complete design, terminate natural on known point
Electric field data collecting work.
G) according to step d) and e) in it is all record point natural electric field time series datas the acquisition moment and frequency number
Value, from the time series data U of the natural electric field signal after the interpolation of the known point of step c) acquisitionCSelected in (t, f) with
Step d) and e) in respective record point natural electric field data acquisition the moment and the identical known point of frequency values interpolation after
Natural electric field data UC(t, f), the natural electric field data U of the different record points to step d) and e) obtainedn(t, f) uses Fn,f=
Un(t,f)/UC(t, f) formula is calculated, and the F of all record points in all directions is obtainedn,fData, wherein n represents different records
The number of point, t are the acquisition moment for measuring natural electric field, and f is the frequency values of natural electric field.
H) according to the coordinate of different record points, difference records the F of the different frequency obtained on pointn,fData, in conjunction with known point
Known geological condition, the geological conditions such as flow direction of underground fluid under comprehensive descision measuring point；It can be using the flat of different record points
Frequency values, the F of areal coordinate, different records pointn,fData combine the altitude data drawing three-dimensional result map of different record points, then tie
It closes other Geological Achievements and flow direction, the buried depth etc. of underground fluid is judged and analyzed.
The natural electric field signal and data obtained on known point and measuring point different directions in above step is according to corresponding
The measuring electrode MN distance of point carries out range normalization processing, thus reduce measuring electrode due to measuring point different directions with it is public
Signal difference caused by measuring electrode distance length is different also can be the actual landform in field work according to measuring point different directions
Landforms situation arranges the measuring electrode for more meeting field condition, reduces field work difficulty, enhances the field adaptability of this method
And flexibility ratio.
Detailed description of the invention：
Fig. 1 is a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction proposed by the present invention
Flow chart；
Fig. 2 is a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction proposed by the present invention
Field arrangement schematic diagram；
A kind of Fig. 3 frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction proposed by the present invention
The three-dimensional result map that field trial data are drawn；
A is known point known to geological condition in Fig. 2, and B is measuring point, and 1~16 arranges measuring electrode for measuring point B different directions
Position and number, N indicate the north to, E indicate east to.
Specific embodiment：
Referring to Fig. 1, Fig. 2, Fig. 3 combination specific embodiment, the present invention will be further described.
As shown in Fig. 2, needing to carry out measuring point B in the exploration area in Fig. 2 identification underground fluid stream proposed by the invention
To the exploration of frequency domain natural electric field annular three-dimensional, record point selection 16, arrange 8 directions altogether, arrange 2 on the same direction
A measuring electrode, and adjacent survey in 2 measuring electrodes on the same direction and the measuring electrode group of public-measurement electrode composition
The distance between amount electrode is identical, and specific step is as follows：
A) selection is required according to exploration purpose, exploration and sets the measurement frequency of the electrical method equipment of all measurement natural electric fields
Rate quantity and frequency values；Present embodiment selects 2 frequencies to carry out, and frequency values are respectively f1,f2；Select two measurement days
The electrical method equipment of right electric field, and consistency check is carried out to two electrical method equipment, obtain the System level gray correlation between instrument.
B) a measurement day is laid in the known point A that choice of prospective area for exploration geological condition is of substantially known, humane electric jamming is small
The electrical method equipment of right electric field, according to fixed time interval (as measurement is primary per minute) measurement some period of known point A frequency
Rate score is f1,f2Natural electric field signal, using known point A two measuring electrode distances to the natural electric field signal carry out
Range normalization processing, obtains the natural electric field time sequence of some period different frequency of range normalization treated known point
Column data U0(t,f1) and U0(t,f2), wherein t is the acquisition moment for measuring natural electric field, f1,f2For two frequencies of natural electric field
Rate score；The selection of known point A can be selected in conjunction with the achievement of the geology of early period etc., as far as possible the letter of selection geological condition
The electrical method equipment of the place arrangement known point A single, stratum is stable, interference is small；The time interval of measurement can depositing according to instrument
How many, surveying accuracy requirement of storage space size, field measuring point etc. is selected；Record the measuring electrode MN distance of electrical method equipment；
For improve known point A natural electric field signal stabilization, using unpolarizable electrode as measuring electrode；The measurement day of known point A
The running parameter of the electrical method equipment of right electric field is identical with the measurement electrical method equipment of natural electric field of measuring point B, but data acquire when
Between interval can be different；The measurement natural electric field of measuring point B is completely covered in the time of measuring range of the measurement natural electric field of known point A
Time of measuring range.
C) two frequency values f of known point A collected to step b)1,f2Natural electric field signal time sequence data
U0(t,f1) and U0(t,f2), time, natural electric field data interpolating are carried out to time series data using interpolation method, obtained
Know two frequency values f of point A1,f2Interpolation after natural electric field signal time series data UC(t,f1) and UC(t,f2)；
The preferable Quadratic Spline Interpolation method of data interpolating method；Result after interpolation, which is subject to, does not change primitive curve general morphology.
D) it needs to carry out in exploration area and lays a public-measurement electrode on the measuring point B of measurement, in the not Tongfang of measuring point B
To (present embodiment select 8 directions, each orientation angle difference be 45 degree) apart from one unit distance of measuring point (assuming that with 20 meters
For a unit distance) measuring electrode 1~8 is laid, a measuring electrode is laid in each direction, if direct north is apart from measuring point B
Laying measuring electrode 1 of 20 meters of length, 45 degree of east northeast, apart from laying measuring electrode 2 of 20 meters of measuring point B length, are laid with this rule
8 measuring electrodes；The record point setting coordinate in each direction is the survey on the measuring point and respective direction for arrange public-measurement electrode
Measure the center point coordinate between electrode；The electrical method device measuring public-measurement electrode and non-Tongfang of natural electric field are measured using one
To measuring electrode between two frequency values f1,f2Natural electric field signal, and using corresponding measuring electrode distance to the letter
Number range normalization processing is carried out, obtains range normalization treated measuring point different directions, two frequency values f1,f2Day
Right electric field time series data Un(t,f1) and Un(t,f2), wherein n represent it is different record point number (in present embodiment n as
1~16 natural number), t is the acquisition moment for measuring natural electric field, f1,f2For the frequency values of natural electric field；To obtain 8
Record two frequency values f of point1,f2Measurement result；To improve exploration effects, the electrical method of all measurement natural electric fields is set
It is standby to carry out coherence measurement, the System level gray correlation between distinct device is obtained, and System level gray correlation is carried out to measured natural electric field result
Correction；The electrical method equipment that natural electric field is measured selected by the step uses copper electrode as measuring electrode, to reduce field
Work difficulty improves working efficiency；The step measurement natural electric field electrical method equipment running parameter and known point it is natural
The running parameter of the electrical method equipment of electric field is identical, but time of measuring interval can be different；The measurement natural electric field of measuring point B
Time of measuring range is completely contained within the scope of the time of measuring of measurement natural electric field of known point A.
E) change the step the measuring point B of the measuring electrode in 8 directions of measuring point B in d) and arrangement public-measurement electrode away from
From, the position of public-measurement electrode is constant, each direction record point setting coordinate be arrange public-measurement electrode measuring point B and
The center point coordinate between measuring electrode in this direction；Acquired again in the way of step d) 8 orientation measurement electrodes with
Two frequency values f between public-measurement electrode1,f2Natural electric field time series data, thus obtain it is other 8 record
The measurement result of point；Until completing the DATA REASONING of all record points.
F) after the natural electric field signal acquisition work on all record points of complete design, terminate the day on known point A
Right electric field data collecting work.
G) according to step d) and e) in it is all record point natural electric field time series datas the acquisition moment and frequency number
Value, from the time series data U of the natural electric field signal after the interpolation of the known point A of step c) acquisitionC(t,f1) and UC(t,f2)
In select the day after the interpolation for acquiring moment and the identical known point A of frequency values with the natural electric field data of respective record point
Right electric field data UC(t,f1) and UC(t,f2), the natural electric field data U of the different record points to step d) and e) obtainedn(t,f1)
And Un(t,f2) use Fn,f=Un(t,f)/UC(t, f) formula is calculated, and the F of all record points is obtainedn,fData, wherein n generation
The number (n is the natural number between 1~16 in the present embodiment) of table difference record point, t is the acquisition for measuring natural electric field
Moment, f are two frequency values f of natural electric field1,f2One of them.
H) according to the coordinate of above 16 record points, difference records the F of the different frequency obtained on pointn,fData, in conjunction with
Know the known geological condition of point A, the geological conditions such as flow direction of underground fluid under comprehensive descision measuring point B；Different notes can be used
Record the plane coordinates of point, frequency values, the F of different records pointn,fData combine the altitude data drawing three-dimensional achievement of different record points
Figure, is judged and is analyzed in conjunction with flow direction, buried depth etc. of other Geological Achievements to underground fluid；Fig. 3 is to take this reality
The three-dimensional result map that the data that the mode of applying obtains are drawn.
The natural electric field signal and data obtained on known point A and measuring point B different directions in above step is according to phase
The measuring electrode MN distance that should be put carries out range normalization processing, thus reduce measuring electrode due to measuring point B different directions with
Signal difference caused by public-measurement electrode distance length is different also can be the reality in field work according to measuring point B different directions
Border situation, which is arranged, more meets the measuring electrode of field condition, reduces field work difficulty, enhance this method field adaptability and
Flexibility ratio.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should be included in the present invention.
Claims (3)
1. a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction, specific step is as follows：
A) selection is required according to exploration purpose, exploration and sets the measurement frequency number of the electrical method equipment of all measurement natural electric fields
Amount and frequency values, the number of frequencies for measuring natural electric field are no less than 2, and the electrical method equipment for measuring natural electric field is no less than 2；
B) a measurement natural electric field is laid in the known point that choice of prospective area for exploration geological condition is of substantially known, humane electric jamming is small
Electrical method equipment and adopted according to the natural electric field signal of fixed time interval measurement some period different frequency of known point
Range normalization processing is carried out to the natural electric field signal with two measuring electrode distances of known point, is obtained at range normalization
The natural electric field time series data U of known point some period different frequency after reason0(t, f), wherein t is the natural electricity of measurement
The acquisition moment of field, f are the frequency values of natural electric field；
C) to the natural electric field signal time sequence data U of the different frequency of step b) known point collected0(t, f), using slotting
Value method carries out the interpolation of time, natural electric field amplitude to time series data, after the interpolation for obtaining the different frequency of known point
Natural electric field signal time series data UC(t,f)；
D) it needs to carry out in exploration area and lays a public-measurement electrode on the measuring point of measurement, in the different directions distance of measuring point
Measuring point certain distance lays other measuring electrodes, and a measuring electrode is laid in each direction；The record point coordinate in each direction is set
The center point coordinate being set between the measuring electrode on the measuring point and respective direction of arrangement public-measurement electrode；It is surveyed using another
Measure the natural of the different frequency between the electrical method device measuring public-measurement electrode and the measuring electrode of different directions of natural electric field
Electric field signal and record acquisition moment, and range normalization processing is carried out to the signal using corresponding measuring electrode distance, it obtains
Range normalization treated different record point, different frequency natural electric field time series data Un(t, f), wherein n generation
The number of table difference record point, t are the acquisition moment for measuring natural electric field, and f is the frequency values of natural electric field；To obtain not
With the natural electric field data measurement of the different frequency of record point；
E) measuring electrode of measuring point different directions in d) is changed the step at a distance from public-measurement electrode, the position of public-measurement electrode
Set it is constant, the record point setting coordinate in each direction be arrange public-measurement electrode measuring point and measuring electrode in this direction it
Between center point coordinate；It is acquired between different directions measuring electrode and public-measurement electrode again not in the way of step d)
The natural electric field time series data of same frequency, to obtain the natural electric field data measurement of different record points；Until complete
At the natural electric field DATA REASONING of all record points；
F) after the natural electric field collecting work on all record points of complete design, terminate the natural electric field acquisition on known point
Work；
G) according to step d) and e) in it is all record point natural electric field time series datas the acquisition moment and frequency values, from
The time series data U of natural electric field signal after the interpolation for the known point that step c) is obtainedCIt is selected in (t, f) and step d)
And e) in respective record point natural electric field data acquisition the moment and the identical known point of frequency values interpolation after natural electricity
Field data UC(t, f), the natural electric field data U of the different record points to step d) and e) obtainedn(t, f) uses Fn,f=Un(t,
f)/UC(t, f) formula is calculated, and the F of all record points is obtainedn,fData, wherein n represents the number of different record points, and t is
The acquisition moment of natural electric field is measured, f is the frequency values of natural electric field；
H) according to the coordinate of different record points, difference records the F of the different frequency obtained on pointn,fData, in conjunction with known point
Know geological condition, the geological conditions such as flow direction of underground fluid under comprehensive descision measuring point.
2. a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction as described in claim 1,
It is characterized in that：Preferably, the differential seat angle in adjacent direction is not less than 10 degree, is not more than 180 degree.
3. a kind of frequency domain natural electric field annular three-dimensional exploitation method of identification underground fluid flow direction as described in claim 1,
It is characterized in that：Preferably, around the relatively uniform measuring point for being distributed in arrangement public-measurement electrode of different record points.
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Cited By (2)
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| CN110687608A (en) * | 2019-11-13 | 2020-01-14 | 张道清 | Annular detection method for geological anisotropy at different depths |
| CN110703346A (en) * | 2019-11-14 | 2020-01-17 | 张道清 | Same-frequency and same-source ratio measurement method for natural electric field |
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| US3136943A (en) * | 1956-04-30 | 1964-06-09 | New Jersey Zinc Co | Geophysical prospecting method utilizing the electric field component of the earth's natural transient electromagnetic fields |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687608A (en) * | 2019-11-13 | 2020-01-14 | 张道清 | Annular detection method for geological anisotropy at different depths |
| CN110703346A (en) * | 2019-11-14 | 2020-01-17 | 张道清 | Same-frequency and same-source ratio measurement method for natural electric field |
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