CN114152989B - Method for calculating coordinates of pseudo-section diagram of two-dimensional asymmetric quadrupole electrical method - Google Patents
Method for calculating coordinates of pseudo-section diagram of two-dimensional asymmetric quadrupole electrical method Download PDFInfo
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Abstract
A method for calculating the coordinate of a cross-section drawing by a two-dimensional asymmetric quadrupole electrical method. The method is based on the characteristics of the asymmetric quadrupole device in the conduction electrical method, and provides that the coordinates of the pseudo-cross-section diagram of the two-dimensional asymmetric quadrupole electrical method measurement result are obtained by adopting the horizontal coordinate and the vertical coordinate formulas of the pseudo-cross-section diagram according to the serial numbers of the power supply electrode and the measurement electrode of the asymmetric quadrupole, and the pseudo-cross-section diagram of the corresponding measurement result is drawn, so that the qualitative analysis and processing are carried out on the measurement result of the asymmetric quadrupole electrical method. The method unifies the coordinate rule of the pseudo-cross-section diagram of the asymmetric quadrupole electrical method, so that the asymmetric quadrupole electrical method measurement data can obtain a more real pseudo-cross-section diagram, and the data interpretation precision and efficiency of the asymmetric quadrupole electrical method are improved.
Description
Technical Field
The invention relates to an electrical method device used in the field of geophysical exploration, and belongs to the field of geophysical exploration. The method unifies the coordinate calculation rule of the pseudo-cross-section diagram of the asymmetric quadrupole conduction electrical method, and can improve the exploration precision and the exploration effect of the asymmetric quadrupole conduction electrical method.
Background
The method can realize quadrupole depth measurement in an asymmetric mode, obviously improves the working efficiency and has some obvious advantages and characteristics. In the conductive electrical prospecting, the application of the technology can realize better prospecting effect with higher prospecting efficiency and lower prospecting cost.
However, when the method is used for two-dimensional asymmetric quadrupole depth measurement exploration, the problem that the calculation of the vertical coordinate and the horizontal coordinate is complex and non-uniform occurs when the obtained asymmetric quadrupole depth measurement two-dimensional profile data is used for drawing a simulated sectional view, and the calculation of the corresponding vertical coordinate and the horizontal coordinate cannot be realized by the calculation rule of the conventional method, so that uncertainty is brought to the application of the method, different calculation rules are easily adopted by different people, and incompatibility is brought to the exploration data; the method belongs to a new method, the obtained data comprises data similar to a plurality of intermediate gradient devices and data similar to a dipole-dipole device, and the coordinates of the pseudo-sectional diagram cannot be obtained according to the conventional device, so that a new pseudo-sectional diagram coordinate calculation method needs to be provided, and the method can be better popularized and applied.
The invention content is as follows:
the invention provides a method for calculating coordinates of a pseudo-section diagram of a two-dimensional asymmetric quadrupole electrical method, which aims to solve the problem of mapping of the pseudo-section diagram in two-dimensional conduction electrical method exploration in an asymmetric quadrupole device.
The novel method comprises the following specific steps:
a) acquiring the numbers of a power supply electrode and a measuring electrode corresponding to each electrical method measuring data of the two-dimensional asymmetric quadrupole electrical method of the same section, wherein the numbers of the power supply electrode and the measuring electrode are sequentially arranged by adopting integers; and the number x of the power supply electrode A of each electrical measurement data A Number x of power supply electrode B less than same electrical measurement data B I.e. x B >x A (ii) a And the editing of the measuring electrode M for each electrical measurement dataNumber x M Number x of measuring electrode N smaller than same electrical measurement data N I.e. x M <x N (ii) a In which x is measured on the same electrical method A 、x B 、x M 、x N Are all not equal; do not develop x A <x M <x B <x N Time two-dimensional asymmetric quadrupole electrical data acquisition without developing x M <x A <x N <x B And (3) time two-dimensional asymmetric quadrupole electrical data acquisition, namely, the power supply electrode and the measuring electrode are not crossed with each other. The number sequence of the power supply electrodes and the measuring electrodes in the step a) is the same as the position sequence of the power supply electrodes and the measuring electrodes arranged in the field on the space when the two-dimensional asymmetric quadrupole electrical method is carried out. The ratio of the number difference between the electrodes (feeding electrodes or measuring electrodes) in step a) to the actual distance between the corresponding electrodes (feeding electrodes or measuring electrodes) is the same.
b) Solving the visual parameter cross-section drawing coordinate X of each electrical method measurement data of the two-dimensional asymmetric quadrupole electrical method according to the formula (1) C ,Y C (ii) a Wherein MIN () is a function to find the minimum value in the corresponding parameter;
c) according to the visual parameter quasi-section coordinate X of each electrical measurement data obtained in the step b) C ,Y C Drawing a cross-section drawing of a visual parameter of electrical measurement data of the two-dimensional asymmetric quadrupole electrical method; when drawing the cross-section drawing of the visual parameters of the two-dimensional asymmetric quadrupole electrical method, X is used C As the abscissa, by Y C As ordinate, the apparent parameter is taken as measured value.
d) And qualitatively analyzing the exploration result of the two-dimensional asymmetric quadrupole electrical method according to the cross-section drawing of the visual parameters of the electrical measurement data of the two-dimensional asymmetric quadrupole electrical method.
If the electrical measurement data of the asymmetric quadrupole electrical method of multiple profiles needs to be comprehensively processed, different profiles can be processed independently, then the electrical measurement data of the asymmetric quadrupole electrical method of multiple profiles are combined, then pseudo-stereograms or pseudo-profile maps of multiple profiles are drawn, and comprehensive analysis and interpretation are carried out, so that a three-dimensional interpretation result is obtained.
Description of the drawings:
FIG. 1 is a flow chart of a method for calculating the coordinates of a two-dimensional asymmetric quadrupole electrical method;
FIG. 2 is a schematic longitudinal section of an earth model;
FIG. 3 is a partial data set for two-dimensional asymmetric quadrupole numerical simulation of the geoelectrical model of FIG. 2, and a partial coordinate of a simulated cross-sectional plot calculated using the present invention;
FIG. 4 is a dot-bitmap plot of coordinates of a pseudo-sectional view computed using the present invention;
FIG. 5 is a plot of apparent resistivity cross-sections plotted using the coordinates of the cross-section calculated by the present invention;
the specific implementation mode is as follows:
the invention is further described below in connection with specific embodiments with reference to fig. 1, 2, 3, 4 and 5.
Assuming that a two-dimensional asymmetric quadrupole conduction electrical survey is developed in the geoelectric model shown in fig. 2, the minimum number of the supply electrodes and the measurement electrodes is 0, the maximum number is 350, and the point distance is 10; a total of 545 sets of asymmetric quadrupoles were obtained using two-dimensional electrical data as shown in table 1:
TABLE 1545 two-dimensional Electrical data for asymmetric quadrupoles
According to the numbers x of the power supply electrode and the measuring electrode A 、x B 、x M 、x N Substituting formula (1) into formula (1) (shown in Table 1) to obtain the coordinate X of the cross-section drawing of the two-dimensional asymmetric quadrupole electrical method C ,Y C The data obtained by calculation are shown in table 2:
table 2545 sets of two-dimensional electrical data cross-section map coordinates and visual parameters of asymmetric quadrupoles
According to the calculated coordinates of the pseudo-cross-section diagram, a point bitmap (shown in figure 4) can be drawn, and an apparent resistivity pseudo-cross-section diagram (shown in figure 5) can be drawn by combining the apparent resistivity result;
it can be seen from FIG. 5 that there is a low resistance anomaly between points 140-210; low resistance anomalies exist between the test points No. 0-90 and No. 260-350, and the low resistance anomalies are caused by a field source effect formed by the low resistance anomalies between the test points No. 140-210; inversion of the data can yield quantitative information about anomalies.
From the above examples, it can be seen that the method provided by the patent has a relatively obvious abnormal display of abnormal body, Y C <An anomaly of 0 represents an anomaly around the measurement point; y is C >An anomaly of 0 is related to the field source effect of anomalous formations near the supply electrodes and tends to be related to Y C <The anomaly of 0 represents an anomaly around the measurement point.
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 method for calculating the coordinate of a simulated cross-section diagram by a two-dimensional asymmetric quadrupole electrical method comprises the following specific steps:
a) acquiring the numbers of a power supply electrode and a measuring electrode corresponding to each electrical method measuring data of the two-dimensional asymmetric quadrupole electrical method of the same section, wherein the numbers of the power supply electrode and the measuring electrode are sequentially arranged by adopting integers; number x of power supply electrode A for each electrical measurement data A Number x of power supply electrode B less than same electrical measurement data B I.e. x B >x A (ii) a Number x of measuring electrode M for each electrical measurement datum M Number x of measuring electrode N smaller than same electrical measurement data N I.e. x M <x N (ii) a In which x is measured on the same electrical method A 、x B 、x M 、x N Are all not equal;
b) solving the visual parameter cross-section drawing coordinate X of each electrical method measurement data of the two-dimensional asymmetric quadrupole electrical method according to the formula (1) C ,Y C (ii) a Wherein MIN () is a function to find the minimum value in the corresponding parameter;
c) according to the visual parameter quasi-section coordinate X of each electrical measurement data obtained in the step b) C ,Y C Drawing a cross-section drawing of a visual parameter of electrical measurement data of the two-dimensional asymmetric quadrupole electrical method;
d) and qualitatively analyzing the exploration result of the two-dimensional asymmetric quadrupole electrical method according to the cross-section drawing of the visual parameters of the electrical measurement data of the two-dimensional asymmetric quadrupole electrical method.
2. The method for calculating the coordinates of a pseudo-cross-section of a two-dimensional asymmetric quadrupole electrical method according to claim 1, wherein: do not develop x A <x M <x B <x N And (3) acquiring data by a time two-dimensional asymmetric quadrupole electrical method.
3. The method for calculating the coordinates of a pseudo-cross-section of a two-dimensional asymmetric quadrupole electrical method according to claim 1, wherein: do not develop x M <x A <x N <x B And (3) acquiring data by a time two-dimensional asymmetric quadrupole electrical method.
4. The method for calculating the coordinates of a pseudo-cross-section of a two-dimensional asymmetric quadrupole electrical method according to claim 1, wherein: when drawing the cross-section drawing of the visual parameters of the two-dimensional asymmetric quadrupole electrical method, X is used C As the abscissa, by Y C As ordinate, the apparent parameter is taken as measured value.
5. The method for calculating the coordinates of a pseudo-cross-section of a two-dimensional asymmetric quadrupole electrical method according to claim 1, wherein: the number sequence of the power supply electrodes and the measuring electrodes in the step a) is the same as the position sequence of the power supply electrodes and the measuring electrodes arranged in the field on the space when the two-dimensional asymmetric quadrupole electrical method is carried out.
6. The method for calculating the coordinates of a pseudo-cross-section of a two-dimensional asymmetric quadrupole electrical method according to claim 1, wherein: the ratio of the number difference between the electrodes in step a) to the actual distance between the corresponding electrodes is the same, and the electrodes in the claims refer to the power supply electrode and the measuring electrode.
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| CN106646624A (en) * | 2016-12-25 | 2017-05-10 | 中南大学 | Asymmetric electrical method-based sounding method |
| CN109977585A (en) * | 2019-04-04 | 2019-07-05 | 中南大学 | A kind of high-precision magnetotelluric the Forward Modeling |
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