CN111273356A - Active power conduction method based on monitoring potential correction - Google Patents
Active power conduction method based on monitoring potential correction Download PDFInfo
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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
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
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Abstract
The method is characterized in that potential monitoring of a certain fixed point is added on the basis of a conventional active source conduction type electrical method, apparent resistivity correction coefficients at different moments on the point are obtained, actual measured apparent resistivity at other measuring points is corrected according to the correction coefficients at different moments, and data processing and interpretation are carried out on the corrected apparent resistivity, so that high-precision electrical prospecting is realized. Compared with the conventional conduction electrical method, the method can eliminate the interference of random electric field signals in the whole area to a certain extent, thereby obtaining higher exploration precision. The method is suitable for measuring areas with larger random electric field interference, such as cities and towns, factories and mines and the like.
Description
Technical Field
The invention relates to a conductive electrical method exploration method in the field of exploration of geophysical, which can weaken random electric field interference in a survey area to a certain extent, thereby improving the exploration precision and effect of an active source conductive electrical method.
Background
At present, the active source conduction method in the geophysical exploration field generally supplies current to a power supply electrode through a special transmitting system, obtains the potential on a measuring electrode through a potential receiver connected with the measuring electrode, converts electrical parameters such as apparent resistivity and the like on corresponding measuring points, and then performs data processing and interpretation on the electrical parameters such as the apparent resistivity and the like, thereby obtaining the resistivity distribution characteristics in the measuring area and performing corresponding geological interpretation.
The conventional active source conduction method suppresses the random electric field interference generally by increasing the power supply current and improving the signal-to-noise ratio of potential data acquired by a potential receiver, so that the exploration precision is improved. When the random electric field interference signal is weak or the power supply current supplied by the active source is strong relative to the interference signal, the receiver of the active source conduction method can obtain relatively reliable data.
However, when the conducted electrical method is carried out in a measurement area (such as a town) with large random electric field interference, the data quality of the active source conducted electrical method is reduced due to the overlarge electric field interference, if the signal-to-noise ratio of exploration data can be improved by increasing the power supply current, on one hand, the power of the transmitting system is increased, the performance requirement of the transmitting system is improved, and the exploration cost is correspondingly increased; on the other hand, the human activities are frequent in a measuring area with large random electric field interference, and if the power supply current is increased, the safety risk of power supply is increased, and the like.
The invention content is as follows:
in order to improve the exploration precision of the active source conduction electrical method, expand the application range of the method, and particularly improve the adaptability of the method in cities and towns, the active source conduction electrical method based on monitoring potential correction is provided. According to the method, a potential monitoring point is additionally arranged on the basis of a conventional active power conduction electrical method, and potentials of the monitoring point at different moments are obtained, so that apparent resistivity correction coefficients at different moments are obtained, and the measured data of all measuring points are corrected, so that the interference degree of random potentials in the measured data of the measuring points is reduced, and the exploration precision and the exploration effect are improved.
An active power conduction method based on monitoring potential correction comprises the following specific steps:
a) according to a conventional active source conduction electrical method, a transmitting system is arranged, such as a transmitter, a lead and a power supply electrode, and a power supply current value, a corresponding power supply time and coordinates of the power supply electrode are recorded. Generally, the active power source conducts electricity, and A and B are arranged to form 2 power supply electrodes. Preferably, as soon as there is a 1% supply current change in the supply current of the transmitting system, the corresponding supply current value and the corresponding supply time are recorded. Or the transmitting system stores the power supply current value at certain time intervals, namely, the time series data of the power supply current is obtained.
b) Selecting a point on the periphery of the power supply electrode as a potential monitoring point, arranging a corresponding monitoring electrode and a potential receiver, recording the coordinate of the monitoring electrode, setting the potential receiver to be repeatedly collected at a certain time length value, and repeatedly measuring the potential value on the corresponding monitoring electrode under the condition of power supply of the transmitting system and recording the time of monitoring the potential. Preferably, the distance between the respective monitoring electrodes is not less than the minimum length of the dipole pair of the measuring electrodes in the measuring region or the distance between adjacent measuring points. Preferably, the number of the monitoring electrodes of the potential monitoring points is 2, and the included angle between the connecting line of the 2 monitoring electrodes and the connecting line of the 2 power supply electrodes is not more than 30 degrees, so that the angle is set mainly for improving the potential value on the monitoring electrodes and avoiding the influence on the exploration precision caused by the over-low signal-to-noise ratio of the monitoring potential due to the over-low potential value; if the number of the power supply electrodes for supplying power simultaneously is more than 2, the limit requirement of 30 degrees is not set. Preferably, the distance from any monitoring electrode to any power supply electrode is not greater than the maximum value of the distance between any two power supply electrodes; the limiting condition is also set to increase the potential value between the monitoring electrodes, that is, the monitoring electrodes are not suitable to be arranged at a position far away from the power supply electrode, and are preferably arranged near the power supply electrode, so that the data quality of the monitoring potential can be ensured. In order to ensure that the interference signals of random potentials in the measuring region included in the monitoring potentials have a good representation, the monitoring electrode can be arranged near the middle point of the power supply electrode. In order to improve the measurement accuracy of the monitored potential and ensure the monitoring efficiency, the acquisition interval time length of the potential receiver of the potential monitoring point is preferably set to be not more than 1 minute, and the potential receiver can be automatically or manually controlled and takes an automatic acquisition mode as the best mode.
c) According to a conventional potential measuring mode of an active source conduction electrical method, under the condition of power supply of a transmitting system, measuring a potential value on a measuring electrode corresponding to a corresponding measuring point on the corresponding measuring point through a potential receiver and recording the time of measuring the potential. The resistivity scanning mode can be adopted, such as developing intermediate gradient resistivity scanning, and the resistivity depth measurement mode can also be adopted, such as developing symmetrical quadrupole or in-line or similar three-dimensional resistivity depth measurement and the like. Namely, the method is not influenced when one-dimensional, two-dimensional, three-dimensional or three-dimensional-like electrical prospecting is developed.
d) And when the potential measurement on all the measuring points is finished, finishing the potential monitoring work on the potential monitoring points. The potential monitoring work on the potential monitoring points is started before the measurement work of all the measuring points and is finished after the measurement work of all the measuring points is finished, so that the correction coefficients of all the measuring points are obtained. Although if the potential monitoring operation is finished in advance before the operation of a part of the measuring points is not finished due to a certain fault of the potential receiver on the monitoring point, the time series data of the existing monitoring potential can be subjected to extended interpolation to obtain interpolated monitoring data, namely, the interpolated monitoring data can be used as a remedy, but the correction effect obtained by the extended interpolation generally has reduced precision.
e) Calculating apparent resistivity values of all monitored potentials of the potential monitoring points and original apparent resistivity values of all measuring points through a device coefficient formula of an active source conduction electrical method; namely, the potential value at the corresponding moment is normalized by the corresponding device coefficient and the current value at the corresponding moment, and the corresponding apparent resistivity value is obtained. This step is similar to the apparent resistivity calculation of conventional active source conduction electrical methods. When the monitoring potential of the potential monitoring point is normalized to the apparent resistivity value, because all the monitoring potential measurements are carried out on the same monitoring electrode, the position of the monitoring electrode is not changed in the measurement process, and if the position of the power supply electrode is not changed, the device coefficient in the apparent resistivity calculation is fixed.
f) And (4) according to the potential measurement time on all the measuring points (excluding the potential monitoring points), calculating the minimum value and the maximum value of the potential measurement time in all the measuring points.
g) And calculating the average value of the apparent resistivities of the potential monitoring points within the range of the minimum value and the maximum value of the potential measuring time in all the measuring points.
h) And then, the ratio of the average value of the apparent resistivities of the potential monitoring points to the apparent resistivity of the potential monitoring points at a certain moment is calculated and used as an apparent resistivity correction coefficient at the corresponding moment, and time series data of the apparent resistivity correction coefficient are obtained. The average value of the apparent resistivity of the potential monitoring points can be an arithmetic average value or a geometric average value or an average value in other ways. In order to reduce the influence of some accidental strong interference data, a threshold value can be set, some data with obvious interference are removed before the average value is obtained, namely the data with the obvious interference are not allowed to participate in the calculation of the apparent resistivity average value.
i) And selecting the apparent resistivity correction coefficient at the same moment as the moment according to the moment of measuring the potential of the corresponding measuring point, and solving the product of the apparent resistivity correction coefficient at the moment and the apparent resistivity of the corresponding measuring point at the moment to obtain the corrected apparent resistivity value of the corresponding measuring point. When the time of recording the measured potential by the measuring point is different from all the times of recording the measured potential by the measuring point, interpolating the apparent resistivity correction coefficient according to the time of recording the measured potential by the measuring point, and solving the apparent resistivity correction coefficient at the same time as the time of recording the measured potential by the measuring point for the apparent resistivity correction in the step.
j) And (4) interpreting the corrected apparent resistivity values of all the measuring points to obtain a new exploration result of the active source conduction electrical method. And if resistivity sounding is carried out, replacing the original apparent resistivity value of the conventional active source conduction electrical method with the corrected apparent resistivity value, and carrying out subsequent data processing and forward inversion by using the corrected value. Because partial random electric field interference data are removed from the corrected apparent resistivity result, the result is more in line with the actual situation in the measurement area, thereby obtaining higher exploration precision and better exploration effect.
If the position of the power supply electrode needs to be changed in the exploration process, the steps only process the potential measurement results when the same power supply electrode supplies power, the potential measurement results when different power supply electrodes supply power are not mixed for calculation, but the corrected apparent resistivity results are calculated in batches, and then all the corrected apparent resistivity results are processed and interpreted.
Description of the drawings:
FIG. 1 is a flow chart of a method of active power conduction method based on monitoring potential correction according to the present invention;
FIG. 2 is a schematic diagram of a field layout of an active source conduction method based on monitor potential correction according to the present invention;
wherein the cross symbols and the numbers a and B in fig. 2 represent the positions and numbers of 2 feeding electrodes, respectively; black circular solid points and numbers (J1 and J2) are 2 monitoring electrodes and numbers of the potential monitoring points; the solid black triangle points and numbers (1/2/3/4/5) represent the 5 measurement points and numbers, respectively.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following embodiments with reference to fig. 1 and 2.
According to the steps in the flow chart of the method for the active power conduction method based on the monitoring potential correction as shown in fig. 1 and the field arrangement schematic diagram as shown in fig. 2, the method is implemented by the following specific steps:
a) in a conventional manner of the active source conduction method, as shown in fig. 2, a transmitting system is arranged to supply power through 2 power supply electrodes a and B, and a power supply current value and a corresponding power supply time are recorded every 10 seconds, and coordinates of the power supply electrodes (such as a and B in fig. 2) are recorded.
b) Selecting a point at the periphery of the power supply electrode as a potential monitoring point, arranging corresponding monitoring electrodes (such as J1 and J2 in figure 2) and a potential receiver (capable of automatically acquiring the potential and recording the acquisition time), recording the coordinates of the monitoring electrodes (such as J1 and J2 in figure 2), setting the potential receiver to repeatedly acquire every 30 seconds, repeatedly measuring the potential value on the corresponding monitoring electrodes (such as J1 and J2 in figure 2) under the condition of power supply of a transmitting system and recording the time of monitoring the potential.
c) According to the conventional potential measurement mode of the active source conduction electrical method, under the condition that a transmitting system is powered, the potential value of the measuring electrode corresponding to the corresponding measuring point (such as 1/2/3/4/5 in fig. 2) is measured at the corresponding measuring point (such as 1/2/3/4/5 in fig. 2) through a potential receiver, and the time of measuring the potential is recorded.
d) When the potential measurement at all the measuring points (such as 1/2/3/4/5 in fig. 2) is finished, the potential monitoring work at the potential monitoring points is finished. Namely, the potential monitoring work on the potential monitoring points is started before the measurement work of all measuring points (such as 1/2/3/4/5 in fig. 2) and is finished after the measurement work of all measuring points (such as 1/2/3/4/5 in fig. 2) is finished, so that the apparent resistivity correction coefficients of all measuring points (such as 1/2/3/4/5 in fig. 2) are obtained.
e) Calculating apparent resistivity values of all monitored potentials of the potential monitoring points and apparent resistivity values of all measuring points (such as 1/2/3/4/5 in figure 2) through a device coefficient formula of an active source conduction electrical method; namely, the potential value at the corresponding moment is normalized by the corresponding device coefficient and the current value at the corresponding moment, and the corresponding apparent resistivity value is obtained. This step is similar to the apparent resistivity calculation of conventional active source conduction electrical methods.
f) And (3) according to the potential measurement time at all the measuring points (such as 1/2/3/4/5 in the figure 2) (excluding the potential monitoring point), finding out the minimum value and the maximum value of the potential measurement time at all the measuring points (such as 1/2/3/4/5 in the figure 2).
g) And (3) averaging the apparent resistivities of the potential monitoring points within the range of the minimum value and the maximum value of the potential measuring time of all the measuring points (such as 1/2/3/4/5 in FIG. 2).
h) And then, the ratio of the average value of the apparent resistivities of the potential monitoring points to the apparent resistivity of the potential monitoring points at a certain moment is calculated and used as an apparent resistivity correction coefficient at the corresponding moment, so that the time series data of the apparent resistivity correction coefficient is obtained. The average value of the apparent resistivity of the potential monitoring points adopts an arithmetic average value.
i) According to the time of measuring the potential of the corresponding measuring point (such as 1/2/3/4/5 in figure 2), selecting the apparent resistivity correction coefficient at the same time as the time, and calculating the product of the apparent resistivity correction coefficient at the time and the apparent resistivity of the corresponding measuring point (such as 1/2/3/4/5 in figure 2) at the time to obtain the corrected apparent resistivity value of the corresponding measuring point (such as 1/2/3/4/5 in figure 2). When the time when the measuring point (such as 1/2/3/4/5 in figure 2) records the measured potential is different from all the times when the apparent resistivity correction coefficient is recorded, the apparent resistivity correction coefficient is interpolated according to the time when the measuring point (such as 1/2/3/4/5 in figure 2) records the measured potential, and the apparent resistivity correction coefficient at the same time when the measuring point (such as 1/2/3/4/5 in figure 2) records the measured potential is obtained for the apparent resistivity correction in the step.
j) And (3) interpreting the corrected apparent resistivity values of all measuring points (such as 1/2/3/4/5 in FIG. 2) to obtain a new exploration result of the active source conduction electrical method. Because partial random electric field interference data are removed from the corrected apparent resistivity result, the result is more in line with the actual situation in the measurement area, thereby obtaining higher exploration precision and better exploration effect.
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 (7)
1. An active power conduction method based on monitoring potential correction comprises the following specific steps:
a) arranging an emission system and a power supply electrode according to a conventional active source conduction electrical method mode, and recording a power supply current value, a corresponding power supply time and coordinates of the power supply electrode;
b) selecting a point on the periphery of a power supply electrode as a potential monitoring point, arranging a corresponding monitoring electrode and a potential receiver, recording the coordinate of the monitoring electrode, setting the potential receiver to repeatedly collect at a certain time length value, and repeatedly measuring the potential value on the corresponding monitoring electrode under the condition of power supply of a transmitting system and recording the time of monitoring the potential;
c) according to a conventional potential measuring mode of an active source conduction electrical method, under the condition of power supply of a transmitting system, measuring a potential value on a measuring electrode corresponding to a corresponding measuring point on the corresponding measuring point through a potential receiver and recording the time of measuring the potential;
d) when the potential measurement on all the measuring points is finished, the potential monitoring work on the potential monitoring points is finished;
e) calculating apparent resistivity values of all monitored potentials of the potential monitoring points and original apparent resistivity values of all measuring points; normalizing the potential value at the corresponding moment by using the corresponding device coefficient and the current value at the corresponding moment to obtain a corresponding apparent resistivity value;
f) according to the potential measurement time on all the measuring points (excluding potential monitoring points), the minimum value and the maximum value of the potential measurement time in all the measuring points are obtained;
g) calculating the average value of the apparent resistivity of the potential monitoring points within the range time of the minimum value and the maximum value of the potential measuring time in all the measuring points;
h) then, the ratio of the average value of the apparent resistivity of the potential monitoring points to the apparent resistivity of the potential monitoring points at a certain moment is calculated and used as an apparent resistivity correction coefficient at a corresponding moment, and time sequence data of the apparent resistivity correction coefficient is obtained;
i) selecting an apparent resistivity correction coefficient at the same moment as the moment according to the moment of measuring the potential of the corresponding measuring point, and solving the product of the apparent resistivity correction coefficient at the moment and the original apparent resistivity of the corresponding measuring point at the moment to obtain a corrected apparent resistivity value of the corresponding measuring point;
j) and (4) interpreting the corrected apparent resistivity values of all the measuring points to obtain a new exploration result of the active source conduction electrical method.
2. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: preferably, as soon as there is a 1% supply current change in the supply current of the transmitting system, the corresponding supply current value and the corresponding supply time are recorded.
3. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: preferably, the number of the power supply electrodes of the transmitting system is 2, the number of the monitoring electrodes of the potential monitoring points is 2, and an included angle between a connecting line of the 2 monitoring electrodes and a connecting line of the 2 power supply electrodes is not more than 30 degrees.
4. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: preferably, the distance from any monitoring electrode to any power supply electrode is not greater than the maximum value of the distance between any two power supply electrodes.
5. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: preferably, the distance between the respective monitoring electrodes is not less than the minimum length of the dipole pair of the measuring electrodes in the measuring region or the distance between adjacent measuring points.
6. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: preferably, the length of the acquisition interval time set by the potential receiver of the potential monitoring point in the step b) is not more than 1 minute.
7. The active source conduction method based on monitoring potential correction as claimed in claim 1, wherein: and when the moment of recording the measured potential by the measuring point is different from all moments of recording the measured potential by the apparent resistivity correction coefficient, interpolating the apparent resistivity correction coefficient according to the moment of recording the measured potential by the measuring point, and solving the apparent resistivity correction coefficient at the same moment as the moment of recording the measured potential by the measuring point for the apparent resistivity correction in the step i).
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| CN115267919A (en) * | 2022-09-27 | 2022-11-01 | 山东省鲁南地质工程勘察院(山东省地质矿产勘查开发局第二地质大队) | Geophysical exploration system based on distributed high-density electrical method |
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