CN113031080A - New induced polarization method adopting simple polarization constant - Google Patents
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- CN113031080A CN113031080A CN202110427235.9A CN202110427235A CN113031080A CN 113031080 A CN113031080 A CN 113031080A CN 202110427235 A CN202110427235 A CN 202110427235A CN 113031080 A CN113031080 A CN 113031080A
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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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
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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 new method for exciting electricity by using simple polarization constant. The method is based on the conventional excitation method, provides a new excitation parameter, namely a simple polarization constant, capable of reflecting an excitation abnormal body, provides a formula of the simple polarization constant, and applies the polarization constant to carry out excitation exploration to find the excitation abnormality. The polarization constant of the method can more truly express the polarization phenomena and characteristics of different induced polarization abnormal bodies, so that the problem of multi-solution of an induced polarization method is weakened, the exploration effect and precision of the induced polarization abnormal bodies can be further improved, and the better exploration effect can be realized with lower exploration cost.
Description
Technical Field
The invention relates to a new induced polarization method for the field of geophysical exploration, and belongs to the field of geophysical exploration. The method can improve the exploration precision and the exploration effect of the induced polarization method, and reduce the exploration economic cost and the time cost.
Background
The existing induced polarization method for measuring potential difference generally judges and analyzes an induced polarization abnormal body through resistivity and polarizability or amplitude frequency, although the existing induced polarization method can better control and define the induced polarization abnormal body, in field practice work, some abnormal bodies with obvious induced polarization phenomenon can not present obvious polarizability or amplitude frequency abnormity in a field exploration result, and some abnormal bodies without obvious excitatory phenomenon also present obvious polarizability or amplitude frequency abnormity, so that trouble and difficulty of abnormal definition are brought to exploration work, some time and economic waste are also caused to the exploration work, and the reason of the abnormal bodies is related to resistivity information carried in polarizability or amplitude frequency parameters, so that polarizability or amplitude frequency parameters are more complex, and the corresponding relation with the induced polarization abnormal bodies is changed. Therefore, it is necessary to research the existing induced polarization method, especially the existing induced polarization method which measures potential difference and calculates polarizability or amplitude frequency through potential difference, and provide new parameters which can represent the abnormal nature of induced polarization, so that the method is applied to induced polarization exploration, and a new induced polarization method which can improve exploration precision and has better exploration effect is formed.
The invention content is as follows:
based on the problems of the existing induced polarization method, the invention provides a novel induced polarization method adopting a simple polarization constant, and the induced polarization abnormal body is analyzed and judged according to the induced polarization forming mechanism by the simple polarization constant, so that the exploration precision and the exploration effect of the induced polarization method are improved.
A new induced polarization method adopting simple polarization constant comprises the following specific steps:
a) selecting an exploration area to be subjected to an induced polarization method, and arranging measuring lines and measuring points; the measuring lines can be arranged as broken lines or straight lines; the line distance and the point distance of the measuring lines can be selected to be equal or unequal; the equal-interval exploration result reflecting effect of the line distance and the point distance of the measuring line is better;
b) arranging a power supply electrode and a measuring electrode; if a device with an infinite power supply electrode or an infinite measuring electrode is selected, the infinite power supply electrode or the infinite measuring electrode is arranged;
c) recording the coordinates of all the power supply electrodes and the measuring electrodes; the coordinate recording is mainly used for subsequent device coefficient calculation and the position positioning of the measurement result so as to analyze the abnormal distribution condition; the coordinates of the electrodes can be selected from a relative coordinate system or a global coordinate system, and the distance relative relation between the electrodes is ensured;
d) an electrical method transmitter is adopted to supply power to the 2 power supply electrodes A and B; if a tripolar electrical method device of A-MN or a dipolar electrical method device of A-M is adopted, the power supply electrode B is an infinite power supply electrode; an electrical method transmitter is adopted to supply power to 2 power supply electrodes A and B, wherein the power supply electrodes can supply power to 1 power supply electrode and the other 1 fixed infinite power supply electrode in the exploration area, and the power supply electrodes can also supply power to 2 power supply electrodes in the exploration area;
e) measuring the potential difference on the 2 measuring electrodes M and N by adopting an electrical method receiver; if an AB-M tripolar electrometric device or an A-M dipolar electrometric device is adopted, the measuring electrode N is an infinite measuring electrode; and recording the power supply current value of the electrical method transmitter when measuring the potential difference on the 2 measuring electrodes M and N; when an electrical method receiver is adopted to measure the potential difference on 2 measuring electrodes M and N, the potential difference can be measured on 1 measuring electrode and the other 1 fixed infinite measuring electrode in an exploration area, and the potential difference can also be measured on 2 measuring electrodes in the exploration area; if a plurality of measuring points need to carry out induced electrical prospecting, at least changing the position of one measuring electrode in the measuring electrodes M and N, and measuring the potential difference on 2 measuring electrodes M and N corresponding to the other measuring point by adopting an electrical method receiver; if the potential difference of different power supply electrode distances of the same measuring point needs to be measured, the position of at least one power supply electrode in the power supply electrodes A and B is changed, and an electrical method receiver is adopted to measure the potential difference of 2 measuring electrodes M and N corresponding to the same measuring point;
if the time domain excitation method for measuring the potential difference is selected, the primary potential difference on 2 measuring electrodes M and N is measured
And the secondary potential difference
The secondary potential difference of the time domain induced polarization method can select the measurement results with different time delays, but all the measurement points adopt the measurement results with the same time delay; the secondary potential difference of the time domain induced polarization method can select an integral measurement result with a certain time length, but all measuring points adopt integral measurement results with the same time length; and recording the current value I of the power supply of the transmitter of the time domain induced polarization method for measuring the potential difference when measuring the potential difference on 2 measuring electrodes M and NMN-AB(ii) a If the electrical method transmitter adopts a current stabilization technology, namely, the current value in the whole measurement process can be ensured to be unchanged, the power supply current value can be recorded only once;
if the frequency domain excitation method for measuring potential difference is selected, the potential difference of N frequencies on 2 measuring electrodes M and N is measured
i∈[1,n](ii) a And recording the power supply current value of the corresponding frequency on the corresponding frequency of the electrical method transmitter of the frequency domain induced polarization method for measuring the potential difference when measuring the potential difference on 2 measuring electrodes M and N
i∈[1,n](ii) a If the electrical method transmitter adopts a current stabilization technology, namely, the current value in the whole measurement process can be ensured to be unchanged, the power supply current value can be recorded only once; wherein f isiIs a frequency value of n different frequencies supplied by an electrical method transmitter of a frequency domain induced polarization method for measuring potential difference, and fiNot equal to 0, i.e. a total of n frequencies f1、f2、…fn-1、fn(ii) a Wherein n is a natural number greater than 1; n are differentThe electrical signals with the frequencies can be supplied with power simultaneously, such as the electrical signals with 2 frequencies simultaneously by a double-frequency excitation method, or can be supplied with power in a time-sharing manner, such as the electrical signals with 1 frequency firstly by a frequency-conversion excitation method, and the electrical signals with another 1 different frequency secondly by the frequency-conversion excitation method; there are methods that may provide electrical signals of 3 or more frequencies at a time or 3 or more frequencies at a time, and these methods are applicable to the present patent technology;
f) according to whether the adopted excitation method is a time domain excitation method for measuring potential difference or a frequency domain excitation method for measuring potential difference, a corresponding formula is selected to calculate simple polarization constants Y of measuring points corresponding to 2 measuring electrodes M and N when corresponding power supply electrodes A and B supply powerh MN-AB(ii) a Wherein K is a device coefficient converted according to the coordinates of the corresponding power supply electrode and the measuring electrode; calculating a device coefficient K by adopting a device coefficient formula in conductive electrical prospecting according to the coordinates of the corresponding power supply electrode and the corresponding measuring electrode, and dividing the device coefficient K into a two-pole device coefficient, a three-pole device coefficient and a four-pole device coefficient based on the arrangement conditions of the corresponding power supply electrode and the corresponding measuring electrode; the general calculation formula for the device coefficient K is:
when the adopted excitation method is a time domain excitation method for measuring potential difference, the formula (1-1) is selected for simple polarization constant Yh MN-ABCalculating (1);
when the adopted excitation method is a frequency domain excitation method for measuring potential difference, the simple polarization constant Yh is carried out by selecting the formula (1-2)MN-ABCalculating (1); f in the formula (1-2)i<fj；
Wherein i and j in the formula (1-2) are intervals [1, n]And i is not equal to j; f. ofi、f j2 of n different frequencies, fi<fj；
g) According to whether the adopted excitation method is a time domain excitation method for measuring potential difference or a frequency domain excitation method for measuring potential difference, when power is supplied to the corresponding power supply electrodes A and B, the resistivities rho of the measuring points corresponding to the 2 measuring electrodes M and N are calculatedMN-AB(ii) a Wherein K is a device coefficient converted according to the coordinates of the corresponding power supply electrode and the measuring electrode; when the adopted excitation method is a time domain excitation method for measuring potential difference, the formula (2-1) is selected to develop the resistivity rhoMN-ABCalculating (1); when the adopted excitation method is a frequency domain excitation method for measuring potential difference, a formula (2-2) is selected to develop resistivity rhoMN-ABCalculating (1); and calculating the device coefficient K by adopting a device coefficient formula in the conductive electrical prospecting according to the coordinates of the power supply electrode and the measuring electrode, and dividing the device coefficient K into a two-pole device coefficient, a three-pole device coefficient and a four-pole device coefficient based on the arrangement conditions of the power supply electrode and the measuring electrode.
Wherein i is the interval [1, n ]]A certain natural number of (1); f. ofiA frequency value of n different frequencies supplied by an electrical method transmitter of a frequency domain induced polarization method for measuring potential difference; wherein K is a device coefficient converted according to the coordinates of the corresponding power supply electrode and the measuring electrode;
h) simple polarization constant Y calculated according to formulah MN-ABAnd resistivity ρMN-ABProcessing the data of all the measuring points to obtain simple abnormal polarization constant and resistivity diagram in the exploration area, and interpreting to obtain explorationAbnormal results of induced electricity in the region. Data processing can be divided into processing in a power-on scanning mode, a power-on section and a power-on depth measurement mode; the excitation scanning surface is used for drawing a contour map or a plane section map of related parameters of the simple polarization parameters and the resistivity data; the induced polarization profile is used for drawing a profile of relevant parameters of the simple polarization parameters and the resistivity data; and performing cross-section drawing of related parameters on the simple polarization parameters and the resistivity data, and performing inversion processing on the simple polarization parameters and the resistivity data.
Description of the drawings:
FIG. 1 is a flow chart of the method of the present invention for using a new method of excitation with a simple polarization constant;
FIG. 2 is a schematic plan view of the working arrangement of an AB-MN quadrupole device of the present invention;
FIG. 3 is a schematic plan view of the working arrangement of the A-MN triode device of the present invention;
FIG. 4 is a contour map of polarizability obtained in a certain measuring region by a conventional induced polarization method;
FIG. 5 is a contour plot of a simple polarization constant obtained in a measurement area (the same measurement area as FIG. 4) according to the present invention;
fig. 2 and 3 show an electrical method transmitter of a dual-frequency excitation instrument corresponding to the dual-frequency excitation method at 1; 2, an electrical method receiver of the double-frequency induced polarization instrument corresponding to the double-frequency induced polarization method; a and B represent the feeding electrode of the present invention; m and N represent measuring electrodes of the invention.
The specific implementation mode is as follows:
the present invention will be further described with reference to fig. 1, 2, 3, 4 and 5 in conjunction with specific embodiments.
Suppose that the double-frequency induced polarization instrument corresponding to the double-frequency induced polarization method is adopted in the exploration area selected in the figure 2 to carry out the induced polarization exploration of the patent technology, and 2 frequencies of the double-frequency induced polarization instrument are selected to be f respectively1＝4/13Hz、f24 Hz; arranging 1 measuring line, and carrying out induced polarization exploration work by adopting an intermediate ladder device;
a) selecting the measuring area shown in FIG. 2, and arranging measuring lines and measuring points; the measuring lines are arranged as straight lines; selecting equal intervals between the measuring point distances;
b) arranging power supply electrodes (A and B shown in figure 2) and measuring electrodes (M and N shown in figure 2) in the exploration area;
c) recording geodetic coordinates of all power supply electrodes and measuring electrodes; the earth coordinate of the electrodes can be selected from a relative coordinate system or a global coordinate system, and the distance relative relation between the electrodes is ensured;
d) an electrical method transmitter (1 in figure 2) of a dual-frequency induced polarization instrument corresponding to a dual-frequency induced polarization method is adopted to supply power to 2 power supply electrodes A and B;
e) an electrical method receiver (2 in figure 2) of the double-frequency induced polarization instrument corresponding to the double-frequency induced polarization method is adopted to measure the potential difference of 2 frequencies on 2 measuring electrodes M and N
And recording the power supply current value of the corresponding frequency on the electrical method transmitter of the double-frequency induced polarization instrument when measuring the potential difference on the 2 measuring electrodes M and N
Wherein f is1、f2Is a frequency value of 2 different frequencies supplied by an electrical method transmitter of a double-frequency induced polarization instrument, namely a total of 2 frequencies f1＝4/13Hz、f2＝4Hz；
f) Because the double-frequency induced polarization instrument is selected in the embodiment and belongs to a frequency domain induced polarization method for measuring potential difference, when the formula (1-2) is selected to calculate the power supply of the corresponding power supply electrodes A and B, the simple polarization constant Y of the measuring point corresponding to the 2 measuring electrodes M and N is calculatedh MN-AB(ii) a K is a device coefficient converted according to the geodetic coordinates of the corresponding power supply electrode and the measuring electrode; calculating a device coefficient K by adopting a device coefficient formula in conductive electrical prospecting according to the geodetic coordinates of the corresponding power supply electrode and the corresponding measuring electrode, and dividing the device coefficient into a dipolar device coefficient, a tripolar device coefficient and a quadrapole device coefficient based on the arrangement conditions of the corresponding power supply electrode and the corresponding measuring electrode; the general calculation for K is:
g) since the dual-frequency induced polarization instrument of the dual-frequency induced polarization method is selected in the embodiment and belongs to the frequency domain induced polarization method for measuring potential difference, when the formula (2-2) is selected to calculate the power supply of the corresponding power supply electrodes A and B, the resistivity rho of the measuring points corresponding to the 2 measuring electrodes M and N is calculatedMN-AB(ii) a K is a device coefficient converted according to the geodetic coordinates of the corresponding power supply electrode and the measuring electrode; the device coefficient K is calculated by adopting a device coefficient formula in conductive electrical prospecting according to the geodetic coordinates of the corresponding power supply electrode and the corresponding measuring electrode, and is divided into a two-pole device coefficient, a three-pole device coefficient and a four-pole device coefficient based on the arrangement conditions of the corresponding power supply electrode and the corresponding measuring electrode. The potential difference and the value of the supply current in equation (2-2) can also be selected1Calculating the measurement result of the frequency, wherein the measurement result of the same frequency is selected for calculation by ensuring all the measurement points in the same measurement area;
h) simple polarization constant Y calculated from equations (1-2) and (2-2)h MN-ABAnd resistivity ρMN-ABProcessing the data of all measuring points to obtain simple polarization in the exploration areaAnd (4) constant and resistivity abnormal graphs are obtained and interpreted, so that the abnormal result of the excitation in the exploration area is obtained. The embodiment adopts the working mode of the middle ladder device, and 1 measuring line is arranged, so that a simple polarization constant and resistivity curve chart of all measuring points of the measuring line can be obtained, and the abnormity explanation is carried out.
The above description is only exemplary of the invention and should not be taken as limiting, since any modifications, equivalents, improvements and the like, which are within the spirit and principle of the invention, are intended to be included therein.
Claims (6)
1. A new induced polarization method adopting simple polarization constant comprises the following specific steps:
a) selecting an exploration area to be subjected to an induced polarization method, and arranging measuring lines and measuring points;
b) arranging a power supply electrode and a measuring electrode;
c) recording the coordinates of all the power supply electrodes and the measuring electrodes;
d) an electrical method transmitter is adopted to supply power to the 2 power supply electrodes A and B;
e) measuring the potential difference on the 2 measuring electrodes M and N by adopting an electrical method receiver; recording the power supply current value of the electrical method transmitter when the potential difference on the 2 measuring electrodes M and N is measured; if a plurality of measuring points need to carry out induced electrical prospecting, the position of at least one measuring electrode in the 2 measuring electrodes is changed, the potential difference on the 2 measuring electrodes corresponding to the other measuring point is measured by adopting an electrical method receiver, and the power supply current value of an electrical method transmitter when the potential difference on the 2 measuring electrodes is measured is recorded; if the potential difference of different power supply electrode distances of the same measuring point needs to be measured, the position of at least one power supply electrode in 2 power supply electrodes is changed, the potential difference of 2 measuring electrodes corresponding to the same measuring point is measured by adopting an electrical method receiver, and the power supply current value of an electrical method transmitter when the potential difference of the 2 measuring electrodes is measured is recorded;
if the time domain excitation method for measuring the potential difference is selected, the primary potential difference on 2 measuring electrodes M and N is measured
And the secondary potential difference
And recording the power supply current value I of the transmitter of the time domain induced polarization method for measuring the potential difference when measuring the potential difference on the 2 measuring electrodes M and NMN-AB；
If the frequency domain excitation method for measuring potential difference is selected, the potential difference of N frequencies on 2 measuring electrodes M and N is measured
And recording the power supply current value of the corresponding frequency on the corresponding frequency of the electrical method transmitter of the frequency domain induced polarization method for measuring the potential difference when measuring the potential difference on 2 measuring electrodes M and N
Wherein f isiIs one of n different frequencies, f, supplied by an electric transmitter of a frequency domain induced polarization method for measuring potential differencesiNot equal to 0, i.e. a total of n frequencies f1、f2、…fn-1、fn(ii) a Wherein n is a natural number greater than 1;
f) according to whether the adopted excitation method is a time domain excitation method for measuring potential difference or a frequency domain excitation method for measuring potential difference, a corresponding formula is selected to calculate simple polarization constants Y of measuring points corresponding to 2 measuring electrodes M and N when corresponding power supply electrodes A and B supply powerh MN-AB(ii) a Wherein K is a device coefficient converted according to the coordinates of the corresponding power supply electrode and the measuring electrode; when the adopted excitation method is a time domain excitation method for measuring potential difference, the formula (1-1) is selected for simple polarization constant Yh MN-ABCalculating (1); when the adopted excitation method is a frequency domain excitation method for measuring potential difference, the simple polarization constant Yh is carried out by selecting the formula (1-2)MN-ABCalculating (1);
wherein i and j are the interval [1, n ]]And i is not equal to j; f. ofi、fj2 of n different frequencies, and f, supplied by an electrometric transmitter of a frequency domain electroseismic method for measuring potential differencesi≠fj；
g) According to whether the adopted excitation method is a time domain excitation method for measuring potential difference or a frequency domain excitation method for measuring potential difference, when power is supplied to the corresponding power supply electrodes A and B, the resistivities rho of the measuring points corresponding to the 2 measuring electrodes M and N are calculatedMN-AB(ii) a Wherein K is a device coefficient converted according to the coordinates of the corresponding power supply electrode and the measuring electrode; when the adopted excitation method is a time domain excitation method for measuring potential difference, the formula (2-1) is selected to develop the resistivity rhoMN-ABCalculating (1); when the adopted excitation method is a frequency domain excitation method for measuring potential difference, a formula (2-2) is selected to develop resistivity rhoMN-ABCalculating (1);
wherein i is the interval [1, n ]]A certain natural number of (1); f. ofiA frequency value of n different frequencies supplied by an electrical method transmitter of a frequency domain induced polarization method for measuring potential difference;
h) simple polarization constant Y calculated according to formulah MN-ABAnd resistivity ρMN-ABAnd processing the data of all the measuring points to obtain a simple polarization constant and resistivity abnormal graph in the exploration area, and interpreting to obtain an induced polarization abnormal result in the exploration area.
2. A new method of excitation with a simple polarization constant as claimed in claim 1, wherein: in the step d), an electrical method transmitter is adopted to supply power to 2 power supply electrodes A and B, wherein the power supply electrodes can supply power to 1 power supply electrode and the other 1 fixed infinite power supply electrode in the exploration area, and the power supply electrodes can also supply power to 2 power supply electrodes in the exploration area; if a tripolar electrical method device of A-MN or a dipolar electrical method device of A-M is adopted, the power supply electrode B is an infinite power supply electrode.
3. A new method of excitation with a simple polarization constant as claimed in claim 1, wherein: when the electrical method receiver is used for measuring the potential difference on the 2 measuring electrodes M and N in the step e), the potential difference can be measured on 1 measuring electrode and the other 1 fixed infinite measuring electrode in the exploration area, or the potential difference can be measured on 2 measuring electrodes in the exploration area, and if an AB-M tripolar electrical method device or an A-M dipolar electrical method device is used, the measuring electrode N is an infinite measuring electrode.
4. A new method of excitation with a simple polarization constant as claimed in claim 1, wherein: f in the formula (1-2) in step f)i<fj。
5. A new method of excitation with a simple polarization constant as claimed in claim 1, wherein: and f) calculating the device coefficient K in the steps f) and g) according to the coordinates of the corresponding power supply electrode and the corresponding measuring electrode by adopting a device coefficient formula in the conductive electrical prospecting, and dividing the device coefficient into a two-pole device coefficient, a three-pole device coefficient and a four-pole device coefficient based on the arrangement condition of the power supply electrode and the measuring electrode.
6. A new method of excitation with a simple polarization constant as claimed in claim 1, wherein: the data processing in the step h) can be divided into processing in a power-on scanning mode, a power-on section and a power-on depth measurement mode; the power-exciting scanning surface is used for drawing a contour map or a plane section map of related parameters of the data; the induced section is used for drawing a section diagram of related parameters of the data; and the induced sounding is to draw a cross-section drawing of relevant parameters of the data and perform inversion processing on the induced sounding data.
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