Apparatus and method for testing migration behavior of non-aqueous phase liquids in a formation

Abstract

The application relates to the technical field of geotechnical engineering, and discloses a device and a method for testing the migration behavior of a non-aqueous phase liquid in a stratum. The device comprises a liquid storage chamber, a test soil chamber, an electrical resistivity acquisition device, an impedance acquisition device and a data processor. The liquid storage chamber stores the non-aqueous phase liquid. The test soil chamber is connected to the liquid storage chamber and is filled with heterogeneous soil. The electrical resistivity acquisition device is used to acquire the electrical resistivity parameters of multiple local regions of the heterogeneous soil. The impedance acquisition device is used to acquire the impedance parameters of multiple local regions of the heterogeneous soil. The data processor is used to analyze the migration behavior of the non-aqueous phase liquid according to the electrical resistivity parameters and the impedance parameters after the non-aqueous phase liquid has penetrated into the heterogeneous soil. The embodiments of the application can be adapted to the application scenarios of analyzing the migration behavior of the non-aqueous phase liquid under the coupling action of multiple fields, and the precision of the test on the migration behavior of the non-aqueous phase liquid is improved.

Description

Technical Field

[0001] This application relates to the field of geotechnical engineering technology, and in particular to a test apparatus and method for the migration behavior of non-aqueous liquids in strata. Background Technology

[0002] Non-aqueous phase liquids (NAPLs) are organic liquids that are insoluble in water or only slightly soluble in water, and can exist in the environment as an independent phase, such as petrochemical pollutants. NAPLs leaked onto the surface can enter aquifers through the vadose zone under the influence of rainfall, gravity, and capillary forces, causing long-term pollution to the underground environment.

[0003] Because the migration process of non-aqueous liquids in geological rock and soil media is relatively complex, and the actual transport of non-aqueous liquids cannot be directly observed, simulation experiments can be used to study the transport mechanism of non-aqueous liquids in rock and soil media under multi-field coupling. However, existing experimental devices for simulating the transport of non-aqueous liquids in rock and soil media have limitations such as difficulty in monitoring multiphase systems and low testing accuracy. Summary of the Invention

[0004] The purpose of this application is to provide a test device and method for the migration behavior of non-aqueous liquids in formations, which overcomes the difficulty in simulating the migration behavior of non-aqueous liquids under multi-field coupling and improves the test accuracy.

[0005] This application provides an apparatus for testing the migration behavior of non-aqueous liquids within a formation, comprising: The liquid storage chamber contains non-aqueous liquid. The test soil chamber, connected to the liquid storage chamber, is filled with heterogeneous soil; A resistivity acquisition device is used to acquire resistivity parameters of multiple local areas of the heterogeneous soil. Impedance acquisition device, used to acquire impedance parameters of multiple local areas of the heterogeneous soil; A data processor is used to analyze the migration behavior of the non-aqueous liquid based on the resistivity parameter and the impedance parameter after the non-aqueous liquid has infiltrated the heterogeneous soil.

[0006] In one embodiment, the experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation further includes: A temperature acquisition device is used to collect temperature parameters from multiple local areas of the heterogeneous soil. The test soil chamber was equipped with heating devices; The data processor is also used to analyze the migration behavior of the non-aqueous liquid based on the temperature parameter, the resistivity parameter, and the impedance parameter.

[0007] In one embodiment, the experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation further includes: A flow rate control device is disposed between the liquid storage chamber and the test soil chamber; The data processor is further configured to configure the flow rate control device to configure the infiltration rate parameters of the non-aqueous liquid into the heterogeneous soil and to analyze the migration behavior of the non-aqueous liquid based on the infiltration rate parameters, the resistivity parameters, and the impedance parameters.

[0008] In one embodiment, the experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation further includes: An image acquisition device is used to acquire seepage images of the non-aqueous liquid within the heterogeneous soil. The data processor is also used to analyze the migration behavior of the non-aqueous phase liquid based on the seepage image, the resistivity parameter, and the impedance parameter.

[0009] In one embodiment, the test soil chamber has multiple sampling holes arranged in an array in the vertical direction, and the resistivity acquisition device and the impedance acquisition device contact the heterogeneous soil through the sampling holes.

[0010] This application embodiment also provides a method for testing the migration behavior of non-aqueous liquids within a formation, executed by the data processor of the aforementioned testing device for the migration behavior of non-aqueous liquids within a formation, including the following steps: After the non-aqueous liquid infiltrates into the heterogeneous soil, the resistivity parameters collected by the resistivity acquisition device and the impedance parameters collected by the impedance acquisition device are obtained. The positional characteristics of the front of the non-aqueous liquid are determined based on the resistivity parameters. The phase characteristics of the non-aqueous liquid are determined based on the impedance parameters. A liquid migration image describing the migration behavior of the non-aqueous liquid is generated based on the phase characteristics and the front position characteristics. The time-series graphs of the liquid migration image, resistivity parameter, and impedance parameter are displayed as experimental results of the migration behavior of the non-aqueous liquid.

[0011] In one embodiment, determining the front position characteristics of the non-aqueous liquid based on the resistivity parameter includes: Each resistivity parameter is compared with a preset resistivity threshold parameter. When the resistivity parameter exceeds the preset resistivity threshold parameter, the vertical distribution and front depth of the non-aqueous liquid are determined based on the position of the resistivity acquisition device, thereby obtaining the front position characteristics of the non-aqueous liquid.

[0012] In one embodiment, determining the phase characteristics of the non-aqueous liquid based on the impedance parameter includes: The impedance parameters are described by diffusion using an equivalent circuit that includes Warburg impedance, resulting in an impedance parameter diffusion model. The parameters related to phase characteristics in the impedance parameter diffusion model are then fitted using a nonlinear least squares method. Based on the fitted parameters, the phase characteristics of the non-aqueous liquid are determined.

[0013] In one embodiment, generating a liquid migration image describing the migration behavior of the non-aqueous liquid based on the phase characteristics and the front position characteristics includes: The phase characteristics and the forward position characteristics are input into a pre-trained migration behavior prediction model to predict the migration behavior of the non-aqueous liquid, thereby obtaining the liquid migration image.

[0014] In one embodiment, prior to the non-aqueous phase liquid infiltrating the heterogeneous soil, the method further includes: Configure temperature parameters and / or infiltration rate parameters for multiple local areas of the heterogeneous soil.

[0015] The beneficial effects of this application are as follows: A test soil chamber filled with heterogeneous soil can be constructed to simulate the scenario of non-aqueous liquids entering below the geological structure. Resistivity parameters of multiple local areas of the heterogeneous soil are collected using resistivity acquisition devices, and impedance parameters of multiple local areas of the heterogeneous soil are collected using impedance acquisition devices. After the non-aqueous liquid infiltrates into the heterogeneous soil, its migration behavior can be analyzed based on the resistivity and impedance parameters. This approach is suitable for application scenarios involving multi-field coupling to analyze the migration behavior of non-aqueous liquids, thus improving the accuracy of experiments on the migration behavior of non-aqueous liquids. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the experimental device for testing the migration behavior of non-aqueous liquids in formations provided in the embodiments of this application.

[0017] Figure 2 This is a schematic diagram of the structure of the experimental soil chamber provided in the embodiments of this application.

[0018] Figure 3 This is a flowchart of the test method for the migration behavior of non-aqueous liquids in formation provided in the embodiments of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and drawings are used to distinguish similar objects and are not used to describe a specific order or sequence.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0022] This application provides an experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation.

[0023] See Figures 1 to 2 In one embodiment, the experimental apparatus for the migration behavior of non-aqueous liquids in the formation includes a liquid storage chamber 1, an experimental soil chamber 2, a resistivity acquisition device 3, an impedance acquisition device 4, and a data processor 5.

[0024] The storage chamber 1 stores a non-aqueous liquid. The storage chamber 1 is constructed of a double-layered stainless steel structure, with the interlayer filled with polyurethane insulation material (thermal conductivity ≤0.025 W / m·K). The non-aqueous liquid can be a solution of crude oil (API level 28-32, viscosity adjustable from 50-200 mPa·s) and a surfactant.

[0025] The experimental soil chamber 2 is connected to the liquid storage chamber 1 and is filled with heterogeneous soil. The experimental soil chamber 2 is a square, detachable box mainly composed of side panels and a bottom plate, both made of polycarbonate material (compressive strength ≥85 MPa, light transmittance >90%). The joints between the side panels and the bottom plate are sealed with fluororubber sealing strips (temperature resistance range -40 ℃ to 200 ℃). The heterogeneous soil is prepared by sealing layers of heterogeneous clay and sand to simulate the geological structure.

[0026] The resistivity acquisition device 3 is used to collect resistivity parameters of multiple local areas of heterogeneous soil. The resistivity acquisition device 3 can be made of multiple stainless steel electrodes (5 mm in diameter and 100 mm in length) to collect resistivity parameters. Each stainless steel electrode is arranged at a different height on the side wall of the test soil chamber 2, for example, with a spacing of 100 mm, to collect resistivity parameters of multiple local areas of heterogeneous soil.

[0027] Impedance acquisition device 4 is used to collect impedance parameters of multiple local areas of heterogeneous soil. Impedance acquisition device 4 can use multiple electrochemical impedance probes to collect impedance parameters. Each electrochemical impedance probe is arranged at a different height on the side wall of the test soil chamber 2, and multi-band sweep frequency technology is used to collect impedance parameters of multiple local areas of heterogeneous soil.

[0028] Data processor 5 is used to analyze the migration behavior of non-aqueous liquids after they infiltrate heterogeneous soil, based on resistivity and impedance parameters. Data processor 5 is connected to resistivity acquisition device 3 and impedance acquisition device 4, respectively, to acquire resistivity parameters from resistivity acquisition device 3 and impedance parameters from impedance acquisition device 4 in real time. Based on the resistivity parameters, it analyzes the frontal position characteristics of the non-aqueous liquid, and based on the impedance parameters, it analyzes the phase characteristics of the non-aqueous liquid, thereby analyzing its migration behavior.

[0029] The experimental device for analyzing the migration behavior of non-aqueous liquids within formations provided in this application embodiment can be adapted to application scenarios involving the analysis of non-aqueous liquid migration behavior under multi-field coupling effects, such as temperature fields, seepage fields, pressure fields, and / or chemical fields. Specifically, the non-aqueous liquid in the storage chamber 1 is injected into the heterogeneous soil in the test soil chamber 2. The resistivity parameters of multiple local areas of the heterogeneous soil are collected using the resistivity acquisition device 3, and the impedance parameters of multiple local areas of the heterogeneous soil are collected using the impedance acquisition device 4. The data processor 5 acquires the collected resistivity and impedance parameters, as well as the temperature, pressure, and / or infiltration rate parameters of the heterogeneous soil in real time. The frontal position characteristics of the non-aqueous liquid are analyzed based on the resistivity parameters, and the phase characteristics of the non-aqueous liquid are analyzed based on the impedance parameters. The migration behavior of the non-aqueous liquid is analyzed in combination with the current temperature, pressure, and / or infiltration rate parameters of the heterogeneous soil.

[0030] In one embodiment, the experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation further includes a temperature acquisition device 6, which collects temperature parameters from multiple local areas of the heterogeneous soil. A heating device 7 is disposed within the test soil chamber 2. A data processor 5 is also used to analyze the migration behavior of the non-aqueous liquid based on temperature, resistivity, and impedance parameters. The heating device 7 is a semiconductor heating element, disposed on the inner surface of each side wall of the test soil chamber 2. The data processor 5 is connected to the heating device 7, controls the heating device 7 to heat the heterogeneous soil to a preset temperature, and acquires the temperature parameters collected by the temperature acquisition device 6 from the heterogeneous soil, in order to analyze the migration behavior of the non-aqueous liquid based on the temperature, resistivity, and impedance parameters.

[0031] In one embodiment, the experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation further includes a flow rate control device 8, which is disposed between the liquid storage chamber 1 and the test soil chamber 2. The data processor 5 is also used to configure the flow rate control device 8 to configure the infiltration rate parameters of the non-aqueous liquid into the heterogeneous soil and to analyze the migration behavior of the non-aqueous liquid based on the infiltration rate parameters, resistivity parameters, and impedance parameters. The flow rate control device 8 is a high-precision solenoid valve (response time <0.5s), disposed on the pipeline connecting the liquid storage chamber 1 and the test soil chamber 2. The data processor 5 is connected to the flow rate control device 8 and controls the opening and closing ratio of the flow rate control device 8 according to the preset infiltration rate parameters to adjust the infiltration rate of the heterogeneous soil, and to analyze the migration behavior of the non-aqueous liquid based on the infiltration rate parameters, resistivity parameters, and impedance parameters.

[0032] In one embodiment, the experimental apparatus for the migration behavior of non-aqueous liquids within a formation further includes an image acquisition device 9, which is used to acquire seepage images of non-aqueous liquids within heterogeneous soil. The data processor 5 is also used to analyze the migration behavior of the non-aqueous liquids based on the seepage images, resistivity parameters, and impedance parameters. The image acquisition device 9 is a camera (120fps, 3840×2160 resolution). The data processor 5 is connected to the image acquisition device 9, controls the image acquisition device 9 to acquire images of non-aqueous liquids within the heterogeneous soil, performs image recognition on the acquired seepage images to determine the frontal position characteristics of non-aqueous liquids in specific areas within the heterogeneous soil, and combines the determined frontal position characteristics with resistivity and impedance parameters to analyze the migration behavior of the non-aqueous liquids.

[0033] See Figure 2 In one embodiment, the test soil chamber 2 has multiple sampling holes 10 arranged in an array in the vertical direction. The resistivity acquisition device 3 and the impedance acquisition device 4 contact the heterogeneous soil through the sampling holes 10. The resistivity acquisition device 3 and the impedance acquisition device 4 are each configured with multiple acquisition channels. The sampling end of each acquisition channel is inserted into the corresponding sampling hole 10 and contacts the heterogeneous soil to collect parameters of the heterogeneous soil.

[0034] This application embodiment also provides a method for testing the migration behavior of non-aqueous liquids within a formation, which is executed by the data processor of the aforementioned test device for the migration behavior of non-aqueous liquids within a formation.

[0035] See Figure 3 In one embodiment, the method for testing the migration behavior of non-aqueous liquids within the formation includes, but is not limited to, steps S301 to S305.

[0036] Step S301: After the non-aqueous liquid infiltrates into the heterogeneous soil, the resistivity parameters collected by the resistivity acquisition device and the impedance parameters collected by the impedance acquisition device are obtained.

[0037] Step S302: Determine the frontal position characteristics of the non-aqueous liquid based on the resistivity parameters.

[0038] In one embodiment, determining the frontal position characteristics of a non-aqueous liquid based on resistivity parameters includes: comparing each resistivity parameter with a preset resistivity threshold parameter; when the resistivity parameter exceeds the preset resistivity threshold parameter, determining the vertical distribution and frontal depth of the non-aqueous liquid based on the location of the resistivity acquisition device, thereby obtaining the frontal position characteristics of the non-aqueous liquid. When the resistivity parameter exceeds the preset resistivity threshold parameter, it indicates that non-aqueous liquid has infiltrated the heterogeneous soil at the location of the resistivity acquisition device. By comparing each resistivity parameter with the preset resistivity threshold parameter, analyzing the relationship between the resistivity parameters of each resistivity acquisition device and the location of the resistivity acquisition device, the vertical distribution and frontal depth of the non-aqueous liquid are determined, thereby obtaining the frontal position characteristics of the non-aqueous liquid.

[0039] Step S303: Determine the phase characteristics of the non-aqueous liquid based on the impedance parameters.

[0040] In one embodiment, determining the phase characteristics of a non-aqueous liquid based on impedance parameters includes: using an equivalent circuit containing Warburg impedance to describe the impedance parameters through diffusion, obtaining an impedance parameter diffusion model, and using nonlinear least squares method to fit the parameters related to phase characteristics in the impedance parameter diffusion model, and determining the phase characteristics of the non-aqueous liquid based on the fitted parameters.

[0041] The expression for the impedance parameter diffusion model is: , , Where Z is the impedance parameter, For semi-infinite diffusion impedance parameters, Angular frequency parameter, f is the frequency parameter, and j is the imaginary unit. To simulate the solution resistance parameters in the formation, Charge transfer impedance parameters, These are the parameters of the double-layer capacitance. This is the Warburg coefficient.

[0042] The expressions for the parameters related to phase characteristics in the fitted impedance parameter diffusion model are as follows: , in, As cluster center, Let be the i-th type of sample, k be the total number of samples, including solution resistance parameters, charge transfer impedance parameters and double layer capacitance parameters in the simulated formation, and x be the data point.

[0043] After fitting the solution resistance parameters, charge transfer impedance parameters, and double-layer capacitance parameters in the simulated formation, the semi-infinite diffusion impedance parameters and corresponding Warburg coefficients are determined based on the impedance parameter diffusion model and the collected impedance parameters. The phase characteristics of the non-aqueous liquid are determined based on the Warburg coefficient, low-frequency impedance slope, and frequency parameters.

[0044] Step S304: Generate a liquid migration image describing the migration behavior of the non-aqueous liquid based on the phase characteristics and front position characteristics.

[0045] In one embodiment, generating a liquid migration image describing the migration behavior of a non-aqueous liquid based on phase characteristics and front position characteristics includes: inputting the phase characteristics and front position characteristics into a pre-trained migration behavior prediction model to predict the migration behavior of the non-aqueous liquid and obtain a liquid migration image. The prediction model consists of a convolutional neural network and a physical information neural network. Specifically, the phase characteristics and front position characteristics are input into the pre-trained migration behavior prediction model, the convolutional neural network extracts features from the phase characteristics and front position characteristics to obtain migration behavior features, and simultaneously determines the migration boundary of the non-aqueous liquid. The migration behavior features and migration boundary constraints are mapped to the physical information neural network to generate a liquid migration image that conforms to physical laws based on physical equations (such as Darcy's law and convection-diffusion equations).

[0046] Step S305: Display the liquid migration image, resistivity parameter, and impedance parameter time-series curves as the experimental results of the migration behavior of the non-aqueous liquid. The liquid migration image is shown to the user, and the time-series curves corresponding to the resistivity and impedance parameters are plotted and displayed as the experimental results of the migration behavior of the non-aqueous liquid. Alternatively, the time-series curves corresponding to the temperature parameter and / or the penetration rate parameter can be plotted and displayed together.

[0047] In one embodiment, before the non-aqueous liquid infiltrates into the heterogeneous soil, the method further includes: configuring temperature parameters and / or infiltration rate parameters for multiple local regions of the heterogeneous soil. By configuring the temperature parameters and / or infiltration rate parameters for multiple local regions of the heterogeneous soil, the migration behavior of the non-aqueous liquid can be analyzed based on the temperature parameters and / or infiltration rate parameters, resistivity parameters, and impedance parameters.

[0048] In summary, the experimental apparatus and method for the migration behavior of non-aqueous liquids within formations provided in this application constructs an experimental soil chamber filled with heterogeneous soil, which can simulate the scenario of non-aqueous liquids entering below the formation structure. Resistivity parameters of multiple local areas of the heterogeneous soil are collected using resistivity acquisition devices, and impedance parameters of multiple local areas of the heterogeneous soil are collected using impedance acquisition devices. After the non-aqueous liquid infiltrates into the heterogeneous soil, the migration behavior of the non-aqueous liquid is analyzed based on the resistivity and impedance parameters. This method is suitable for application scenarios involving multi-field coupling to analyze the migration behavior of non-aqueous liquids, improving the accuracy of experiments on the migration behavior of non-aqueous liquids.

[0049] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0050] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A test apparatus for the migration behavior of non-aqueous liquids within a formation, characterized in that, include: The liquid storage chamber contains non-aqueous liquid. The test soil chamber, connected to the liquid storage chamber, is filled with heterogeneous soil; A resistivity acquisition device is used to acquire resistivity parameters of multiple local areas of the heterogeneous soil. Impedance acquisition device, used to acquire impedance parameters of multiple local areas of the heterogeneous soil; A data processor is used to analyze the migration behavior of the non-aqueous liquid based on the resistivity parameter and the impedance parameter after the non-aqueous liquid has infiltrated the heterogeneous soil. The data processor performs the following steps: After the non-aqueous liquid infiltrates into the heterogeneous soil, the resistivity parameters collected by the resistivity acquisition device and the impedance parameters collected by the impedance acquisition device are obtained. The positional characteristics of the front of the non-aqueous liquid are determined based on the resistivity parameters. The phase characteristics of the non-aqueous liquid are determined based on the impedance parameters. A liquid migration image describing the migration behavior of the non-aqueous liquid is generated based on the phase characteristics and the front position characteristics. Display the liquid migration image, the resistivity parameter, and the impedance parameter corresponding to the parameter time series curves as the experimental results of the migration behavior of the non-aqueous liquid; The determination of the front position characteristics of the non-aqueous liquid based on the resistivity parameter includes: Each resistivity parameter is compared with a preset resistivity threshold parameter. When the resistivity parameter exceeds the preset resistivity threshold parameter, the vertical distribution and front depth of the non-aqueous liquid are determined based on the position of the resistivity acquisition device, thereby obtaining the front position characteristics of the non-aqueous liquid.

2. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, The experimental apparatus for testing the migration behavior of non-aqueous liquids within formations also includes: A temperature acquisition device is used to collect temperature parameters from multiple local areas of the heterogeneous soil. The test soil chamber was equipped with heating devices; The data processor is also used to analyze the migration behavior of the non-aqueous liquid based on the temperature parameter, the resistivity parameter, and the impedance parameter.

3. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, The experimental apparatus for testing the migration behavior of non-aqueous liquids within formations also includes: A flow rate control device is disposed between the liquid storage chamber and the test soil chamber; The data processor is further configured to configure the flow rate control device to configure the infiltration rate parameters of the non-aqueous liquid into the heterogeneous soil and to analyze the migration behavior of the non-aqueous liquid based on the infiltration rate parameters, the resistivity parameters, and the impedance parameters.

4. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, The experimental apparatus for testing the migration behavior of non-aqueous liquids within formations also includes: An image acquisition device is used to acquire seepage images of the non-aqueous liquid within the heterogeneous soil. The data processor is also used to analyze the migration behavior of the non-aqueous phase liquid based on the seepage image, the resistivity parameter, and the impedance parameter.

5. The experimental apparatus for testing the migration behavior of non-aqueous liquids within formations according to any one of claims 1 to 4, characterized in that, The test soil chamber has multiple sampling holes arranged in an array in the vertical direction, and the resistivity acquisition device and the impedance acquisition device contact the heterogeneous soil through the sampling holes.

6. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, Determining the phase characteristics of the non-aqueous liquid based on the impedance parameter includes: The impedance parameters are described by diffusion using an equivalent circuit that includes Warburg impedance, resulting in an impedance parameter diffusion model. The parameters related to phase characteristics in the impedance parameter diffusion model are then fitted using a nonlinear least squares method. Based on the fitted parameters, the phase characteristics of the non-aqueous liquid are determined.

7. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, The step of generating a liquid migration image describing the migration behavior of the non-aqueous liquid based on the phase characteristics and the front position characteristics includes: The phase characteristics and the forward position characteristics are input into a pre-trained migration behavior prediction model to predict the migration behavior of the non-aqueous liquid, thereby obtaining the liquid migration image.

8. The experimental apparatus for testing the migration behavior of non-aqueous liquids within a formation according to claim 1, characterized in that, Before the non-aqueous liquid infiltrates into the heterogeneous soil, the method further includes: Configure temperature parameters and / or infiltration rate parameters for multiple local areas of the heterogeneous soil.

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