Multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system and method for oil storage area

Abstract

The present application relates to the technical field of environmental monitoring of oil pollution area, and particularly relates to a multi-channel parallel acquisition interwell three-dimensional resistivity monitoring system and method for oil storage area. The power supply, the host, the multi-channel parallel acquisition device and the four-pole AM-BN acquisition device are sequentially connected. The multi-channel parallel acquisition device comprises a multi-channel electrode conversion box, a plurality of potential channel sockets are arranged in the multi-channel electrode conversion box, the number of the potential channel sockets is the same as the number of probes, twenty-four potential channels are arranged in each potential channel socket, a relay and a current channel switch are arranged in each channel, one end of the relay is connected with a corresponding electrode on the resistivity probe, and the other end of the relay is connected with an acquisition module. The system has high acquisition efficiency, can better realize real-time monitoring of leakage, has high monitoring precision, can accurately identify small leakage in the oil storage area, and realizes remote in-situ monitoring of oil pollution area leakage.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology for oil-polluted areas, and in particular to a multi-channel parallel acquisition system and method for three-dimensional resistivity monitoring between wells in oil storage areas. Background Technology

[0002] Petroleum products are currently the most widespread type of LNAPLs (Low Acids, Oils, and Petroleum Products). As tanks and pipelines age, gas stations built in the early days have gradually developed leakage problems, becoming serious sources of soil and groundwater pollution.

[0003] Current methods for monitoring leaks in oil storage facilities mainly include sensor monitoring, automatic tank metering, liquid level monitoring, vacuum pressure monitoring, and double-bottom plate monitoring. Sensor monitoring systems use liquid or gas sensors installed in monitoring wells, oil collection tanks, or the gap between the two layers of the tank to monitor leaking oil and gas. This method typically only provides early warning when the leak reaches a certain level, resulting in poor real-time performance. Automatic tank metering, liquid level monitoring, vacuum pressure monitoring, and double-bottom plate monitoring all involve modifying the oil storage tank and adding monitoring equipment inside, enabling real-time monitoring. However, they still have the limitation of not being able to pinpoint the leak location. Existing oil storage facility monitoring technologies require modifications to the storage facilities or tanks to meet technical requirements to achieve real-time monitoring, sometimes even necessitating complete replacement of the tanks. This is very costly and has not been widely adopted. Furthermore, these technologies cannot pinpoint the leak area and have low sensitivity for detecting micro-leaks.

[0004] Resistivity tomography is a multi-device, multi-pole-spacing measurement method that relies on automated computer processing. This geophysical method is sensitive to changes in the subsurface medium, enabling real-time, continuous information on its properties. It allows for real-time monitoring of oil storage facility leaks and three-dimensional analysis of the evolution of oil contamination zones. Inter-well resistivity tomography deploys an electrode system as probes within the well, significantly reducing surface interference and thus improving the accuracy of subsurface resistivity data.

[0005] In the invention patent application with application number 201810737744.X and title "Real-time Monitoring Method for Underground Leakage in Oil Storage Area", the real-time monitoring steps include establishing a monitoring area at an outer perimeter of (1-3) meters around the oil storage area, dividing the entire annular monitoring area into n rectangular sub-regions of equal size and distributed in a single row and column; setting (2n+2) resistivity probes at the vertices of the n rectangular sub-regions; during resistivity measurement, the electrodes of each probe are powered sequentially, and all electrodes of adjacent probes are simultaneously measured for potential, and the resistivity distribution between probes is obtained after inversion imaging; initial resistivity measurement is performed to obtain the resistivity background value between each probe, and the resistivity at each moment is compared with the background value by I1. The leakage location and diffusion direction of oil substances in the area can be determined by I1.

[0006] Although the prior patent application has achieved real-time monitoring of oil pollution areas, it also has certain shortcomings: First, it does not adopt a multi-channel parallel acquisition method, resulting in low acquisition efficiency and poor data real-time performance; second, it uses a two-electrode acquisition device, which results in a small amount of data, low spatial resolution, and poor monitoring accuracy, and cannot well meet the needs of real-time monitoring of minor leaks in oil storage facilities.

[0007] Therefore, it is necessary to develop real-time monitoring devices that can improve monitoring efficiency and accuracy, and provide technical support for monitoring pollution from oil spills in contaminated areas. Summary of the Invention

[0008] The purpose of this invention is to overcome the above-mentioned defects in the existing technology and propose a multi-channel parallel acquisition system and method for monitoring three-dimensional resistivity between wells in oil storage areas. It has high acquisition efficiency, can better realize real-time monitoring of leakage, and has high monitoring accuracy. It can accurately identify minute leakage in oil storage areas and realize remote in-situ monitoring of leakage in oil-contaminated areas.

[0009] The technical solution of the present invention is: a multi-channel parallel acquisition system for three-dimensional resistivity monitoring between wells in an oil storage area, including a power supply and a host, wherein the system also includes a multi-channel parallel acquisition device, a four-electrode AM-BN acquisition device and a data terminal, wherein the power supply, the host, the multi-channel parallel acquisition device and the four-electrode AM-BN acquisition device are connected in sequence.

[0010] The multi-channel parallel acquisition device includes a multi-channel electrode conversion box, which contains several potential channel sockets. The number of potential channel sockets is the same as the number of probes. Each potential channel socket contains twenty-four potential channels. Each channel is equipped with a relay and a current channel switch. One end of the relay is connected to the corresponding electrode on the resistivity probe, and the other end of the relay is connected to the acquisition module.

[0011] The quadrupole AM-BN acquisition device includes several resistivity probes, which are located in parallel acquisition wells.

[0012] The quadrupole AM-BN acquisition device also includes a power supply electrode A, a power supply electrode B, a measuring electrode M, and a measuring electrode N. The power supply electrode A and the measuring electrode M are located on the same resistivity probe, and the power supply electrode B and the measuring electrode N are located on another resistivity probe. The power supply electrode A and the measuring electrode M are equidistant from each other and from each other with the power supply electrode B and the measuring electrode N. AM=BN=na, where a is the electrode distance of the probe, and n=1,2,3,...23.

[0013] In this invention, the host includes an acquisition module and a wireless data transmission module. The acquisition module includes an operational amplifier circuit for amplifying signals, a bandpass filter for separating and denoising signals, a preconditioning circuit composed of a potential adjustment circuit, and a digital-to-analog converter circuit for converting analog signals into digital signals.

[0014] The resistivity probe includes an inner tube, electrode plates, and a sleeve. A conical stainless steel head for penetration is welded and fixed to the bottom end of the inner tube. A sleeve is provided on the outside of the inner tube. Several electrode plates are evenly spaced between the inner tube and the sleeve along the axial direction of the inner tube. The electrode plates are connected to corresponding relays through wires. In this embodiment, each resistivity probe is provided with twenty-four electrode plates. The gap between the inner tube and the sleeve is also filled with epoxy resin.

[0015] The quadrupole AM-BN acquisition device includes four resistivity probes.

[0016] This invention also includes a method for monitoring resistivity using the aforementioned multi-channel parallel acquisition inter-well three-dimensional resistivity monitoring system in the oil reservoir, comprising the following steps:

[0017] S1. The power supply supplies power to the host, and the host's acquisition module sends control commands to control the on / off state of the electrodes on the resistivity probe through the multi-channel parallel acquisition device, and manage the working state of each electrode on the probe.

[0018] S2. Acquire potential values ​​using a multi-channel parallel acquisition device:

[0019] S2.1 Power supply electrode A and measuring electrode M are located on resistivity probe No. 1, and power supply electrode B and measuring electrode N are located on resistivity probe No. 2. At this time, all 24i electrode channels in the multi-channel electrode conversion box are turned on.

[0020] S2.1.1 Fix the power supply electrode A and the measuring electrode M. The power supply electrode A is located on the electrode plate at the top of the resistivity probe No. 1, at which point AM=a. Move the power supply electrode B and the measuring electrode N sequentially from top to bottom. During the movement, maintain the same distance between the power supply electrode B and the measuring electrode N as between the power supply electrode A and the measuring electrode M, with BN=a. During the movement, collect the potential values ​​of the measuring electrode N and the measuring electrode M respectively, thereby obtaining the potential difference between the two measuring electrodes.

[0021] S2.1.2 Increase the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N by one time. At this time, AM=BN=2a. Power supply electrode A is still located at the top electrode plate of the resistivity probe No. 1. Fix power supply electrode A and measuring electrode M. Move power supply electrode B and measuring electrode N from top to bottom in sequence, and collect the potential difference between measuring electrode N and measuring electrode M respectively during the movement.

[0022] S2.1.3 Continue to increase the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, and repeat the above data acquisition process until the distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, reaches its maximum. At this time, AM=BN=23a. During the above process, keep power supply electrode A at the top of the electrode plate of resistivity probe No. 1.

[0023] S2.1.4 When AM=BN=23a, change the position of the power supply electrode A, so that the power supply electrode A moves down one electrode distance along the resistivity probe No. 1, and then keep the position of the power supply electrode A unchanged, and repeat steps S2.1.1 to S2.1.3;

[0024] When AM=BN=22a, change the position of the power supply electrode A again, so that the power supply electrode A moves down along the first resistivity probe in sequence. Keep the position of the power supply electrode A unchanged, and repeat steps S2.1.1 to S2.1.3 until AM=BN=a, and complete the potential value acquisition of the second resistivity probe.

[0025] S2.1.5 Transfer the power supply electrode B and the measurement electrode N to the resistivity probe No. 3 and the resistivity probe No. 4 in sequence. Repeat steps S2.1.1 to S2.1.4 to complete the data measurement and acquisition of the resistivity probe No. 3 and the resistivity probe No. 4 in sequence.

[0026] S2.2 Transfer the power supply electrode A and the measurement electrode M to the resistivity probe No. 2. At this time, turn on the seventy-two potential channels from the resistivity probe No. 2 to the resistivity probe No. 4, so that the power supply electrode B and the measurement electrode N are located on the resistivity probe No. 3 and the resistivity probe No. 4 in sequence. Repeat step S2.1.

[0027] S2.3 Transfer the power supply electrode A and the measurement electrode M to the resistivity probe No. 3 in sequence. At this time, the power supply electrode B and the measurement electrode B are located on the resistivity probe No. 4. Turn on the forty-eight potential channels of the resistivity probe No. 3 and the resistivity probe No. 4, and repeat step S2.1.

[0028] The S3 acquisition module will amplify, reduce noise, and convert the potential signal detected by the measuring electrodes to digital-to-analog conversion to complete the acquisition of resistivity data. The data will be sent to the data terminal via the wireless transmission module for inversion processing and leakage analysis to achieve remote in-situ monitoring of oil pollution areas.

[0029] The beneficial effects of this invention are:

[0030] (1) The present invention adopts a multi-channel parallel acquisition method for inter-well resistivity, which has high acquisition efficiency and can better realize real-time monitoring of leakage, and realize remote in-situ monitoring of leakage in oil pollution areas;

[0031] (2) This invention can select any one or more channels to be effective or ineffective. A small number of electrode abnormalities have little impact on the overall data quality, thus improving the accuracy of monitoring.

[0032] (3) The present invention uses a quad-electrode AM-BN acquisition device, which can better meet the three-dimensional observation requirements of three-dimensional inter-well resistivity tomography "seeing through the hole", reduce the influence of the current channel, and has high monitoring accuracy. It can accurately identify the small leakage that occurs in the oil storage area.

[0033] (4) The present invention does not require modification of oil storage facilities or tanks, which can save the cost of gas station leakage monitoring. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the system structure;

[0035] Figure 2 This is a schematic diagram of the working principle of a multi-channel parallel acquisition device;

[0036] Figure 3 This is a schematic diagram of the resistivity probe structure;

[0037] Figure 4 This is a schematic diagram of the structure of a quadrupole AM-BN acquisition device;

[0038] Figure 5 This is a flowchart of the monitoring method.

[0039] In the diagram: 1 Power supply; 2 Main unit; 3 Multi-channel motor conversion box; 4 Resistivity probe; 5 Data terminal; 6 Oil storage area; 7 Contamination plume; 11 Circuit channel switch; 12 Relay; 13 Inner tube; 14 Electrode plate; 15 Sleeve Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] like Figures 1 to 4 As shown, the multi-channel parallel acquisition system for three-dimensional resistivity monitoring between wells in the oil reservoir area according to the present invention includes a power supply 1, a host 2, a multi-channel parallel acquisition device, a multi-stage AM-BN acquisition device, and a data terminal 5, wherein the power supply 1, host 2, multi-channel parallel acquisition device, and four-stage AM-BN acquisition device are connected in sequence. The power supply 1 is composed of a 12V, 60AH high-power lithium battery and is connected to the host 2 using a dedicated connecting cable.

[0043] Host 2 includes a data acquisition module and a wireless data transmission module, such as Figure 2 As shown, the acquisition module includes a programmable operational amplifier circuit, a bandpass filter, a pre-conditioning circuit composed of a potential adjustment circuit, and a digital-to-analog converter circuit. The operational amplifier circuit amplifies the signal, the bandpass filter separates and reduces noise in the signal, and the digital-to-analog converter circuit converts the analog signal into a digital signal to complete the potential data acquisition. The wireless transmission module consists of a 512MHz whip antenna connected to the host and transmits the acquired oil storage area resistivity data to data terminal 5. Data terminal 5 receives the resistivity data from the wireless transmission module, performs inversion processing and imaging, and analyzes the leakage of the oil storage facility.

[0044] The multi-channel parallel acquisition device includes a multi-channel electrode conversion box 3, which contains several potential channel sockets, the number of which is the same as the number of probes. Each potential channel socket contains twenty-four potential channels, the number of which is the same as the number of electrode plates on each probe. Each potential channel socket can be connected to a twenty-four-pole cable. In this embodiment, the multi-channel electrode conversion box 3 contains four potential channel sockets. Each channel is equipped with a corresponding relay 12 and a current channel switch 11. One end of the relay 12 is connected to the corresponding electrode on the resistivity probe, and the other end is connected to the acquisition module. The relay 12 and the current channel switch 11 control the state of the corresponding electrode. During operation, the relay 12 and the current channel switch 11 can be used to select any one or more channels to be active or inactive, enabling simultaneous acquisition of up to ninety-six channels, thus achieving parallel acquisition of resistivity values.

[0045] like Figure 3 As shown, the quadrupole AM-BN acquisition device includes four resistivity probes 4, which are located in parallel acquisition wells. Each resistivity probe includes an inner tube 13, electrode plates 14, and a sleeve 15. A conical stainless steel head for penetration is welded to the bottom end of the inner tube 13. A sleeve 15 is provided on the outer side of the inner tube 13. Several electrode plates 14 are evenly spaced between the inner tube 13 and the sleeve 15 along the axial direction of the inner tube 13. Each electrode plate 14 is connected to a corresponding relay 12 via a wire. In this embodiment, each resistivity probe 4 has twenty-four electrode plates 14. The gap between the inner tube 13 and the sleeve 15 is filled with epoxy resin, which serves to fix the inner tube 13 and the sleeve 15.

[0046] like Figure 4 As shown, the quadrupole AM-BN acquisition device includes power supply electrode A, power supply electrode B, measuring electrode M, and measuring electrode N. Power supply electrode A and measuring electrode M are located on the same resistivity probe, while power supply electrode B and measuring electrode N are located on another resistivity probe. Positioning the two power supply electrodes on two separate resistivity probes reduces the influence of the current path. Power supply electrode A and measuring electrode M are equidistant from each other, as are power supply electrode B and measuring electrode N, i.e., AM = BN = na, where 'a' is the probe electrode distance, i.e., the distance between two adjacent electrode plates, and 'n' = 1, 2, 3, ..., 23. During operation, power is supplied to power supply electrode A and power supply electrode B, and the potential difference between measuring electrode M and measuring electrode N is acquired.

[0047] The present invention also includes a method for monitoring resistivity using the above-mentioned multi-channel parallel acquisition inter-well three-dimensional resistivity monitoring system in the oil storage area, the method comprising the following steps.

[0048] In the first step, power supply 1 supplies power to host 2. The acquisition module of host 2 sends control commands to control the on / off state of the electrodes on resistivity probe 4 through the multi-channel parallel acquisition device, and manage the working status of each electrode on the probe.

[0049] The second step is to acquire potential values ​​using a multi-channel parallel acquisition device.

[0050] Suppose that the system has i probes, which are located in each parallel acquisition well, where i is not less than 4. In this embodiment, i=4.

[0051] During the data acquisition process, power supply electrode A and measuring electrode M are located on probe 1, and power supply electrode B and measuring electrode N are located on probe 2. At this time, all ninety-six electrode channels in the multi-channel electrode conversion box 3 are activated. First, power supply electrode A and measuring electrode M are fixed, with power supply electrode A positioned on the electrode plate at the top of probe 1 (AM=a). Power supply electrode B and measuring electrode N are then moved sequentially from top to bottom, and the potential values ​​of measuring electrode N and measuring electrode M are collected during this movement to obtain the potential difference between the two measuring electrodes. During the movement, the distance between power supply electrode B and measuring electrode N remains equal to that between power supply electrode A and measuring electrode M, i.e., BN=a.

[0052] Next, the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, is doubled. At this point, AM = BN = 2a. Power supply electrode A and measuring electrode M are fixed, with power supply electrode A still located at the top electrode plate of probe 1. Power supply electrode B and measuring electrode N are moved sequentially from top to bottom, and the potential values ​​of measuring electrode N and measuring electrode M are collected during the movement to obtain the potential difference between the two measuring electrodes. Then, the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, is further increased, and the above data collection process is repeated until the distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, reaches its maximum, at which point AM = BN = 23a. Throughout the above process, the position of power supply electrode A remains unchanged, i.e., it is always located at the top electrode plate of probe 1.

[0053] Next, change the position of the power supply electrode A, moving it downwards along probe 1 by one electrode distance, while keeping the position of the power supply electrode A unchanged. When the distance between the power supply electrode A and the measuring electrode M is one electrode distance, fix the power supply electrode A and the measuring electrode M. At this time, AM=BN=a. Move the power supply electrode B and the measuring electrode N sequentially from top to bottom, and collect the potential values ​​of the measuring electrode N and the measuring electrode M respectively during the movement, thereby obtaining the potential difference between the two measuring electrodes. Then, gradually increase the electrode distance between the power supply electrode A and the measuring electrode M, and between the power supply electrode B and the measuring electrode N, and repeat the above steps, collecting the potential difference value between the measuring electrode N and the measuring electrode M.

[0054] When the electrode distance between the power supply electrode A and the measuring electrode M, and between the power supply electrode B and the measuring electrode N, reaches its maximum, the position of the power supply electrode A is changed again, so that the power supply electrode A moves downward along the probe No. 1 in sequence, and the above measurement process is repeated. During the above action, the potential value signals of the measuring electrode N and the measuring electrode M are processed and acquired by the acquisition module.

[0055] After completing the potential value acquisition of probe 2 according to the above steps, transfer the power supply electrode B and the measurement electrode N to probe 3 and probe 4 in sequence, and repeat the above measurement process.

[0056] After completing the data measurement and acquisition of probes 3 and 4 in sequence according to the above steps, transfer the power supply electrode A and the measurement electrode M to probe 2. At this time, turn on the 72 potential channels of probes 2, 3 and 4, so that the power supply electrode B and the measurement electrode N are located on probes 3 and 4 in sequence, and repeat the above measurement process.

[0057] Finally, the power supply electrode A and the measuring electrode M are transferred to probe 3, and the 48 potential channels of probes 3 and 4 are turned on. At this time, the power supply electrode B and the measuring electrode B are located on probe 4. The above measurement process is repeated to realize the measurement and acquisition of three-dimensional all-round potential values ​​in the well area.

[0058] The third step involves the acquisition module processing the potential signal detected by the measuring electrodes through amplification, noise reduction, and digital-to-analog conversion to acquire resistivity data. The data is then transmitted wirelessly to data terminal 5 for inversion processing and leakage analysis, enabling remote in-situ monitoring of oil-contaminated areas.

[0059] The above provides a detailed description of the multi-channel parallel acquisition system and method for three-dimensional resistivity monitoring between wells in oil reservoirs, as provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for monitoring three-dimensional resistivity between wells in an oil reservoir using multi-channel parallel acquisition, characterized in that, The detection is carried out using a multi-channel parallel acquisition well three-dimensional resistivity monitoring system in the oil storage area. The monitoring system includes a power supply (1) and a host (2). The system is characterized by further including a multi-channel parallel acquisition device, a four-electrode AM-BN acquisition device and a data terminal (5). The power supply (1), the host (2), the multi-channel parallel acquisition device and the four-electrode AM-BN acquisition device are connected in sequence. The multi-channel parallel acquisition device includes a multi-channel electrode conversion box (3). The multi-channel electrode conversion box (3) is equipped with several potential channel sockets. The number of potential channel sockets is the same as the number of probes. Each potential channel socket is equipped with twenty-four potential channels. Each channel is equipped with a relay (12) and a current channel switch (11). One end of the relay (12) is connected to the corresponding electrode on the resistivity probe, and the other end of the relay (12) is connected to the acquisition module. The quadrupole AM-BN acquisition device includes several resistivity probes (4), which are located in parallel acquisition wells. The quadrupole AM-BN acquisition device also includes a power supply electrode A, a power supply electrode B, a measurement electrode M, and a measurement electrode N. The power supply electrode A and the measurement electrode M are located on the same resistivity probe, and the power supply electrode B and the measurement electrode N are located on another resistivity probe. The power supply electrode A and the measurement electrode M are equidistant from each other, and the power supply electrode B and the measurement electrode N are equidistant from each other. AM=BN=na, where a is the electrode distance of the probe, and n=1,2,3,...

23. The method includes the following steps: S1. The power supply supplies power to the host, and the host's acquisition module sends control commands to control the on / off state of the electrodes on the resistivity probe through the multi-channel parallel acquisition device, and manage the working state of each electrode on the probe. S2. Acquire potential values ​​using a multi-channel parallel acquisition device: S2.1 Power supply electrode A and measuring electrode M are located on resistivity probe No. 1, and power supply electrode B and measuring electrode N are located on resistivity probe No.

2. At this time, all ninety-six electrode channels in the multi-channel electrode conversion box are turned on. S2.1.1 Fix the power supply electrode A and the measuring electrode M. The power supply electrode A is located on the electrode plate at the top of the resistivity probe No. 1, at which point AM=a. Move the power supply electrode B and the measuring electrode N sequentially from top to bottom. During the movement, maintain the same distance between the power supply electrode B and the measuring electrode N as between the power supply electrode A and the measuring electrode M, with BN=a. During the movement, collect the potential values ​​of the measuring electrode N and the measuring electrode M respectively, thereby obtaining the potential difference between the two measuring electrodes. S2.1.2 Increase the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N by one time, AM=BN=2a. At this time, power supply electrode A is located at the top electrode plate of the resistivity probe No.

1. Fix power supply electrode A and measuring electrode M, and move power supply electrode B and measuring electrode N from top to bottom in sequence, and collect the potential difference between measuring electrode N and measuring electrode M respectively during the movement. S2.1.3 Continue to increase the electrode distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, and repeat the above data acquisition process until the distance between power supply electrode A and measuring electrode M, and between power supply electrode B and measuring electrode N, reaches its maximum. At this time, AM=BN=23a. During the above process, keep power supply electrode A at the top of the electrode plate of resistivity probe No.

1. S2.1.4 When AM=BN=23a, change the position of the power supply electrode A, so that the power supply electrode A moves down one electrode distance along the resistivity probe No. 1, and then keep the position of the power supply electrode A unchanged, and repeat steps S2.1.1 to S2.1.3; When AM=BN=22a, change the position of the power supply electrode A again, so that the power supply electrode A moves down along the first resistivity probe in sequence. Keep the position of the power supply electrode A unchanged, and repeat steps S2.1.1 to S2.1.3 until AM=BN=a, and complete the potential value acquisition of the second resistivity probe. S2.1.5 Transfer the power supply electrode B and the measurement electrode N to the resistivity probe No. 3 and the resistivity probe No. 4 in sequence. Repeat steps S2.1.1 to S2.1.4 to complete the data measurement and acquisition of the resistivity probe No. 3 and the resistivity probe No. 4 in sequence. S2.2 Transfer the power supply electrode A and the measuring electrode M to the resistivity probe No.

2. At this time, turn on the seventy-two potential channels from the resistivity probe No. 2 to the resistivity probe No. 4, so that the power supply electrode B and the measuring electrode N are located on the resistivity probe No. 3 and the resistivity probe No. 4 in sequence. Repeat step S2.

1. S2.3 Transfer the power supply electrode A and the measuring electrode M to the resistivity probe No. 3 in sequence. At this time, the power supply electrode B and the measuring electrode B are located on the resistivity probe No.

4. Turn on the forty-eight potential channels of the resistivity probe No. 3 and the resistivity probe No.

4. Repeat step S2.1 to complete the measurement and acquisition of the three-dimensional potential value in the well area. The S3 acquisition module will amplify, reduce noise, and convert the potential signal detected by the measuring electrodes to digital-to-analog conversion to complete the acquisition of resistivity data. The data will be sent to the data terminal via the wireless transmission module for inversion processing and leakage analysis to achieve remote in-situ monitoring of oil-contaminated areas.

2. The method for multi-channel parallel acquisition of three-dimensional resistivity monitoring between wells in an oil reservoir area according to claim 1, characterized in that, The host (2) includes an acquisition module and a data wireless transmission module. The acquisition module includes an operational amplifier circuit for amplifying signals, a bandpass filter for separating and denoising signals, a preconditioning circuit composed of a potential adjustment circuit, and a digital-to-analog converter circuit for converting analog signals into digital signals.

3. The method for multi-channel parallel acquisition of three-dimensional resistivity monitoring between wells in an oil reservoir area according to claim 1, characterized in that, The resistivity probe includes an inner tube (13), electrode plates (14) and a sleeve (15). The bottom end of the inner tube (13) is welded and fixed with a conical stainless steel head for penetration. The outer side of the inner tube (13) is provided with a sleeve (15). Several electrode plates (14) are evenly spaced between the inner tube (13) and the sleeve (15) along the axial direction of the inner tube (13). The electrode plates (14) are connected to the corresponding relays (12) through wires. Each resistivity probe (4) is provided with twenty-four electrode plates (14). The gap between the inner tube (13) and the sleeve (15) is also filled with epoxy resin.

4. The method for multi-channel parallel acquisition of three-dimensional resistivity monitoring between wells in an oil reservoir area according to claim 1, characterized in that, The quadrupole AM-BN acquisition device includes four resistivity probes (4).

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