Point power supply multi-depth detection device

Abstract

The invention belongs to the technical field of electrical prospecting, and provides a point power supply multi-depth detection device, which comprises a power supply electrode A, an infinite electrode C and n groups of potential observation electrodes arranged in front of and behind the power supply electrode A, each group of observation electrodes are acquisition electrodes M and N; the power supply electrode A is used for being matched with the infinity electrode C to form a power supply loop, potential signals of different depths are synchronously collected through the n sets of observation electrodes, and the function of reducing one power supply electrode is achieved. Only two power supply electrodes are arranged, cables are greatly reduced by dozens of kilograms, and the labor intensity of workers is greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of electrical exploration technology, specifically relating to a point power source multi-depth detection device. Background Technology

[0002] like Figure 1 A traditional symmetrical four-electrode combined profiling device for apparent resistivity typically consists of an infinity electrode C, two power supply points A and B, and a set of M and N for observation. This type of device can only detect one depth. For combined profiling, power is supplied to both A and C at a single measuring point, and the potential difference between measuring electrodes M and N is observed to calculate the apparent resistivity p. SA， Then, power is supplied to electrodes B and C, and p is calculated. SB This observation point generates a pair of joint profile resistivity data. By synchronously moving four electrodes, observations are made at each measuring point along the survey line, forming a pair of joint profile data for the survey line. These two sets of p... SB p SA The positive and negative intersections of the curves formed by the data set are used to determine the structural properties and location. Since the distance between A and B remains constant, the detection depth is fixed, h=k*(AB / 2), (k is the depth coefficient, which is generally verified based on the electrical sounding data of the borehole point, and is generally 0.6-0.95).

[0003] like Figure 2 Traditional symmetrical four-electrode profiling devices typically consist of four electrodes: A and B are power supply electrodes, and M and N are measurement electrodes. This device can only perform qualitative analysis at one depth, and it is extremely cumbersome to use in the field. Due to the two power supply points, the cables are heavy, resulting in very high labor intensity and making communication difficult. Each power supply point has approximately 10 electrodes, with the wires ranging from several hundred to one kilogram in length and weighing around 30 kilograms.

[0004] In summary, the existing combined profiles have the following drawbacks: 1. Apparent resistivity can only be detected at one depth at a time.

[0005] 2. There are three power supply electrodes, and the wires are several hundred to several kilometers long. The labor intensity for workers is high, and some of the wires are heavy, weighing tens of kilograms.

[0006] 3. Increased communication difficulties and unavoidable location errors.

[0007] 4. Only one combined profile at a certain depth can be provided, resulting in a symmetrical quadripolar profile. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides a point power source multi-depth detection device to solve the problems in the prior art. The technical solution adopted by this invention is as follows: A point power source multi-depth detection device includes a power supply electrode A, an infinity electrode C, and n sets of observation electrodes arranged in front of and behind the power supply electrode A. Each set of observation electrodes includes acquisition electrodes M and N; The power supply electrode A is used to form a power supply circuit with the infinity electrode C, and the potential signals at different depths are collected synchronously through n sets of observation electrodes, thereby reducing the number of power supply electrodes by one.

[0009] Furthermore, the power supply electrode A is initially located at a distance AO outside the starting point of the survey line, and the first set of observation electrodes is deployed at the starting point of the survey line. When the power supply electrode A moves to a position at a distance AO from the starting point of the survey line, a new set of observation electrodes is deployed at the corresponding position, so that the power supply electrode A is equivalent to another power supply electrode B for the new observation electrode.

[0010] Furthermore, the power supply electrode A, the infinity electrode C, and the n sets of observation electrodes move synchronously towards the end of the survey line, collecting the potential signals at each observation point simultaneously, thus completing the multi-depth joint profile exploration.

[0011] Furthermore, n sets of observation electrodes are connected to the potential acquisition unit via short wires to synchronously acquire potential signals at different depths and calculate the apparent resistivity at the same location at multiple depths.

[0012] Furthermore, n is an integer greater than 1. By increasing the number of observation electrode groups, detection at n times the depth can be achieved simultaneously, increasing the detection efficiency by n times.

[0013] The present invention has the following beneficial effects: (1) Multiple depths can be detected at once. Since the data is collected by short wires, only a few more sets of acquisition instruments are needed. (2) With only two power supply electrodes, the number of cables is greatly reduced, by tens of kilograms, and the labor intensity of workers is greatly reduced; (3) There is only one communication group, so there will be no point error; (4) The observed data can be calculated, and the results of multi-depth joint profile and multi-depth symmetrical quadrupole can be submitted at once. Attached Figure Description

[0014] Figure 1 It is a traditional combined cross-sectional schematic diagram.

[0015] Figure 2 This is a schematic diagram illustrating the principle of point power source detection at different depths in this invention.

[0016] Figure 3 This is a flowchart of the detection process of the method of the present invention; Figure 4 This is a schematic diagram of the structural arrangement of point power sources at the same depth. Figure 5It is a schematic diagram of the layout of multi-depth structures of point sources; Specific embodiments

[0017] Next, in combination with Figures 1-5 in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. If not specifically specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0018] Such as Figure 3 , the principle of point-source detection of the present invention: △U MN =U M -U N =IΡS / 2π<1 / AM - 1 / AN> (half space) ΡS = k*△U MN / I K = 1 / 2*3.1415 / (1\AM - 1\AN) <k is the device coefficient> When the distance between point A and MN remains unchanged, its detection depth is fixed. When multiple groups of MN are used for observation, the apparent resistivity values at different depths can be detected, realizing the multi-depth detection technology Such as Figure 4 , the present invention discloses a point-source multi-depth detection device, including a power supply electrode A, an infinite far electrode C, and n groups of observation electrodes arranged in front of and behind the power supply electrode A; Each group of observation electrodes includes acquisition electrodes M and N; The power supply electrode A is used to cooperate with the infinite far electrode C to form a power supply loop, and synchronously collect potential signals at different depths through n groups of observation electrodes, realizing the function of reducing one power supply electrode.

[0019] Further, the power supply electrode A is initially located at a position outside the starting point of the survey line at a distance AO, and the first group of observation electrodes is arranged at the starting point of the survey line; when the power supply electrode A moves to a position at a distance AO from the starting point of the survey line, a new group of observation electrodes is arranged at the corresponding position, making the power supply electrode A equivalent to another power supply electrode for the new observation electrodes.

[0020] Further, the power supply electrode A, the infinite far electrode C, and the n groups of observation electrodes move point by point towards the end point of the survey line synchronously, and synchronously collect the potential signals at each observation point to complete the multi-depth combined profile detection.

[0021] Further, the n groups of observation electrodes are connected to the potential acquisition unit through short wires, used to synchronously collect potential signals at different depths, and calculate the multi-depth apparent resistivity at the same position.

[0022] Furthermore, n is an integer greater than 1. By increasing the number of observation electrode groups, detection at n times the depth can be achieved simultaneously, increasing the detection efficiency by n times.

[0023] In practical implementation, this invention arranges n sets of observation electrodes before and after electrode A, representing different depths. Potential acquisition electrodes M and N are positioned before and after electrode A, respectively, and can be arranged in n sets, representing n depths. In this way, electrode A simultaneously functions as electrode B, reducing the need for one power supply electrode B. During measurement, the starting position of electrode A is located outside the starting point AO of the survey line. Receiving electrodes M2a and N2a are located at the starting point of the survey line. Then, the three electrodes move synchronously point by point for measurement. At this time, electrode A acts as electrode A for receiving electrodes M2a and N2a. When electrode A moves past the starting point and is a distance AO from the starting point, another set of receiving electrodes M2b and N2b is added. At this time, electrode A acts as electrode B for receiving electrodes M2b and N2b. Thus, the four receiving electrodes and one power supply electrode A move synchronously towards the end point of the survey line, measuring synchronously until all measuring points are completed, thus completing the joint profile detection work for one depth. If more sets of receiving electrodes are added, multi-depth detection can be performed simultaneously, increasing efficiency by n times.

[0024] Since there is only one power supply point A and one infinity electrode C, short wires are used for receiving at points M and N. This allows for the simultaneous reception of several sets of potentials at different depths, enabling the calculation of the apparent resistivity P at the same location at multiple depths. SA P SB This achieves the goals of multi-depth joint profiling and multi-depth symmetrical quadrupole. Labor intensity is greatly reduced, and detection results are increased several times over.

[0025] like Figure 5 A multi-depth detection system is formed by two power sources. By deploying multiple acquisition systems before and after pole A, a multi-depth joint profile and symmetrical four-pole profile observation system is created. The principle for the placement of the two power sources is as follows: pole A is placed outside the starting point of the survey line and is used as pole A initially. When pole A passes the starting point of the survey line and is at a distance AO from the starting point, pole A simultaneously becomes pole B. Another set of observation instruments is then placed at the starting point of the survey line to collect the potential data of the starting point. Then, the entire survey line is gradually observed point by point. Similarly, by deploying several sets of observation instruments before and after pole A, the purpose of multi-depth detection can be achieved.

[0026] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A point power source multi-depth detection device, characterized in that, It includes power supply electrode A, infinity electrode C, and n sets of observation electrodes arranged in front of and behind power supply electrode A; Each set of observation electrodes collects potential differences M and N; The power supply electrode A is used to form a power supply circuit with the infinity electrode C, and the potential signals at different depths are collected synchronously through n sets of observation electrodes, thereby reducing the number of power supply electrodes by one.

2. The point power source multi-depth detection device according to claim 1, characterized in that, The power supply electrode A is initially located at a distance AO outside the starting point of the survey line, and the first set of observation electrodes is set up at the starting point of the survey line. When the power supply electrode A moves to a position at a distance AO from the starting point of the survey line, a new set of observation electrodes is set up at the corresponding position, so that the power supply electrode A is equivalent to another power supply electrode B for the new observation electrode.

3. The point power source multi-depth detection device according to claim 1, characterized in that, The power supply electrode A, the infinity electrode C, and the n sets of observation electrodes move synchronously towards the end of the survey line, collecting the potential signals of each observation point simultaneously, and completing the multi-depth joint profile exploration.

4. The point power source multi-depth detection device according to claim 1, characterized in that, n sets of observation electrodes are connected to the potential acquisition unit through short wires to synchronously acquire potential signals at different depths and calculate the apparent resistivity at the same location at multiple depths.

5. A point power source multi-depth detection device according to claim 1, characterized in that, n is an integer greater than 1. By increasing the number of observation electrode groups, detection at a depth of n times can be achieved simultaneously, and the detection efficiency is increased by n times.

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