Carbon dioxide electromagnetic monitoring identification method, device, equipment and medium

Abstract

The application provides a carbon dioxide electromagnetic monitoring and identification method, device, equipment and medium. The method comprises the following steps: under the conditions of a plurality of groups of preset temperature and pressure conditions and preset oil content conditions, performing carbon dioxide core displacement experiments to obtain core resistivity data; acquiring logging data of a research area; performing forward calculation according to the logging data and a plurality of groups of preset thickness conditions and preset resistivity conditions of target layers to obtain absolute abnormal peak voltage data; obtaining absolute abnormal difference voltage data according to the core resistivity data and the absolute abnormal peak voltage data; and determining a carbon dioxide electromagnetic monitoring and identification template according to preset absolute abnormal difference voltage division standards and the absolute abnormal difference voltage data. The application can realize the judgment of the feasibility of carbon dioxide electromagnetic monitoring and identification and the accuracy of identification results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploration and development, in particular to a carbon dioxide electromagnetic monitoring and identification method, device, equipment and medium. BACKGROUND

[0002] At present, wide-area electromagnetic method is a new carbon dioxide monitoring technology, which can monitor the wave and position of carbon dioxide in the formation, but the monitoring and identification results are affected by the oil-bearing properties of the target layer. The feasibility of monitoring carbon dioxide by wide-area electromagnetic method under different temperature and pressure conditions and different oil saturation of the target layer still needs to be demonstrated. SUMMARY

[0003] The present application aims to provide a carbon dioxide electromagnetic monitoring and identification method, device, equipment and medium, which realizes the feasibility of carbon dioxide electromagnetic monitoring and identification and the accuracy of the identification results.

[0004] The carbon dioxide electromagnetic monitoring and identification method according to the first aspect of the present application comprises:

[0005] Under a plurality of groups of preset temperature and pressure conditions and preset oil-bearing conditions, a carbon dioxide core displacement experiment is performed to obtain core resistivity data, the core resistivity data comprising core resistivity change data corresponding to each group of preset temperature and pressure conditions and preset oil-bearing conditions;

[0006] Obtain well logging data of a study area;

[0007] According to the well logging data, a plurality of groups of preset target layer thickness conditions and preset target layer resistivity conditions, forward modeling is performed to obtain absolute abnormal peak voltage data, the absolute abnormal peak voltage data comprising absolute abnormal peak voltage corresponding to each group of preset target layer thickness conditions and preset target layer resistivity conditions;

[0008] According to the core resistivity data and the absolute abnormal peak voltage data, absolute abnormal difference voltage data is obtained, the absolute abnormal difference voltage data comprising absolute abnormal difference voltage corresponding to each group of preset temperature and pressure conditions, preset oil-bearing conditions and preset target layer thickness conditions;

[0009] According to a preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, a carbon dioxide electromagnetic monitoring and identification template is determined, the carbon dioxide electromagnetic monitoring and identification template comprising identifiable oil-bearing condition ranges corresponding to each group of preset temperature and pressure conditions and preset target layer thickness conditions.

[0010] According to some embodiments of the present application, the carbon dioxide core displacement experiment under a plurality of groups of temperature and pressure preset conditions and oil content preset conditions is performed to obtain core resistivity data, including:

[0011] A plurality of groups of the temperature and pressure preset conditions and the oil content preset conditions are obtained, wherein the temperature and pressure preset conditions in each group of the temperature and pressure preset conditions and the oil content preset conditions include a group of preset temperatures and pressures, and the oil content preset conditions include a preset oil saturation;

[0012] The carbon dioxide core displacement experiment is performed on each group of the temperature and pressure preset conditions and the oil content preset conditions to obtain a plurality of groups of core resistivity change data corresponding to each group of the temperature and pressure preset conditions and the oil content preset conditions;

[0013] The core resistivity data is obtained according to each group of the core resistivity change data.

[0014] According to some embodiments of the present application, a group of the core resistivity change data corresponding to each group of the temperature and pressure preset conditions and the oil content preset conditions includes a group of initial core resistivity and end core resistivity.

[0015] According to some embodiments of the present application, each of the absolute abnormal difference voltages is obtained by the following steps:

[0016] An initial absolute abnormal peak voltage corresponding to the initial core resistivity is determined;

[0017] An end absolute abnormal peak voltage corresponding to the end core resistivity is determined;

[0018] The absolute abnormal difference voltage corresponding to the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage is determined, and the absolute abnormal difference voltage is an absolute value of a difference between the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage.

[0019] According to some embodiments of the present application, the carbon dioxide electromagnetic monitoring identification template is determined according to the preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, including:

[0020] The correlation curve of the oil saturation and the absolute abnormal difference voltage is drawn under the same temperature and pressure preset conditions and the target layer thickness preset conditions;

[0021] The identifiable oil saturation range corresponding to the absolute abnormal difference voltage division standard and the correlation curve is obtained to determine the carbon dioxide electromagnetic monitoring identification template.

[0022] According to some embodiments of the present application, the absolute abnormal difference voltage division criterion includes a basic identifiable absolute abnormal difference voltage division criterion and a stably identifiable absolute abnormal difference voltage division criterion.

[0023] According to some embodiments of the present application, the well logging data includes well logging curves.

[0024] The forward calculation according to the well logging data and the multiple sets of preset conditions of the target layer thickness and the target layer resistivity obtains absolute abnormal peak voltage data, including:

[0025] A basic geoelectric model is established according to the well logging curves.

[0026] The multiple sets of preset conditions of the target layer thickness and the target layer resistivity are obtained, and in each set of preset conditions of the target layer thickness and the target layer resistivity, the preset condition of the target layer thickness includes a preset target layer thickness, and the preset condition of the target layer resistivity includes a preset target layer resistivity.

[0027] Multiple fine geoelectric models are established according to the basic geoelectric model and the multiple sets of preset conditions of the target layer thickness and the target layer resistivity.

[0028] Each of the fine geoelectric models is subjected to forward calculation to obtain each of the absolute abnormal peak voltages corresponding to each set of preset conditions of the target layer thickness and the target layer resistivity.

[0029] The absolute abnormal peak voltage data is obtained according to each of the absolute abnormal peak voltages.

[0030] The carbon dioxide electromagnetic monitoring and identifying device according to the second aspect of the embodiments of the present application includes:

[0031] A first obtaining module is configured to perform a carbon dioxide core displacement experiment under multiple sets of preset conditions of temperature and pressure and oil content to obtain core resistivity data, the core resistivity data including core resistivity change data corresponding to each set of preset conditions of temperature and pressure and oil content.

[0032] An acquisition module is configured to acquire well logging data of a study area.

[0033] A second obtaining module is configured to perform forward calculation according to the well logging data and multiple sets of preset conditions of target layer thickness and target layer resistivity to obtain absolute abnormal peak voltage data, the absolute abnormal peak voltage data including absolute abnormal peak voltages corresponding to each set of preset conditions of target layer thickness and target layer resistivity.

[0034] The third obtaining module is configured to obtain absolute abnormal difference voltage data according to the core resistivity data and the absolute abnormal peak voltage data, the absolute abnormal difference voltage data including corresponding absolute abnormal difference voltage under each set of the preset temperature and pressure condition, the preset oil-bearing condition and the preset target layer thickness condition;

[0035] The determining module is configured to determine a carbon dioxide electromagnetic monitoring and identification template according to a preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, the carbon dioxide electromagnetic monitoring and identification template including an identifiable oil-bearing condition range under each set of the preset temperature and pressure condition and the preset target layer thickness condition.

[0036] The electronic device according to the third aspect of the present application comprises a processor and a memory, the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement the steps of the carbon dioxide electromagnetic monitoring and identification method according to any one of the first aspect of the present application.

[0037] The computer readable storage medium according to the fourth aspect of the present application stores computer executable instructions for executing the carbon dioxide electromagnetic monitoring and identification method according to the first aspect of the present application.

[0038] In the embodiments of the present application, through carbon dioxide core displacement experiments, the core resistivity variation after carbon dioxide enters the target layer rock of the research area is found out, and then the absolute abnormal difference voltage caused by the resistivity variation is analyzed, the absolute abnormal difference voltage is distinguished according to a preset absolute abnormal difference voltage division standard, and then the analysis and judgment of the feasibility of electromagnetic monitoring and identification and the accuracy of the identification result are realized, so as to obtain a carbon dioxide electromagnetic monitoring and identification template, i.e., an identifiable core oil-bearing condition range under each temperature and pressure condition. The carbon dioxide electromagnetic monitoring and identification is based on this identification template, and the corresponding target layer core oil-bearing condition range can be stably identified under different target layer temperature and pressure conditions by using the wide-area electromagnetic method. In addition, the present application provides theoretical support for practical application scenarios such as monitoring the carbon dioxide swept range, leakage storage and real-time monitoring of carbon dioxide breakthrough, and helps the large-area promotion of the electromagnetic method for monitoring the carbon dioxide swept range.

[0039] Other features and advantages of the present application will be set forth in the specification, and in part will become apparent from the specification, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments, including the cooperation with the accompanying drawings, in which:

[0041] Figure 1 is a flowchart of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0042] Figure 2 is a device schematic diagram of a carbon dioxide core displacement experiment of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0043] Figure 3 is a core resistivity data table of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0044] Figure 4 is a table of preset conditions of target layer thickness and preset conditions of target layer resistivity of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0045] Figure 5 is an absolute abnormal peak voltage data table of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0046] Figure 6 is an absolute abnormal difference voltage data table of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0047] Figure 7 is a crossplot of absolute abnormal difference voltage and oil saturation under a temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0048] Figure 8 is a crossplot of absolute abnormal difference voltage and oil saturation under another temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0049] Figure 9 is a crossplot of absolute abnormal difference voltage and oil saturation under another temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0050] Figure 10 is a crossplot of absolute abnormal difference voltage and oil saturation under another temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0051] Figure 11 is a crossplot of absolute abnormal difference voltage and oil saturation under another temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0052] Figure 12 is a crossplot of absolute abnormal difference voltage and oil saturation under another temperature and pressure condition of an embodiment of the carbon dioxide electromagnetic monitoring and identifying method of the present application;

[0053] Figure 13 is a carbon dioxide electromagnetic monitoring identification template of an embodiment of the carbon dioxide electromagnetic monitoring identification method of the present application;

[0054] Figure 14 is a structural schematic diagram of an embodiment of the carbon dioxide electromagnetic monitoring identification device of the present application;

[0055] Figure 15 is a hardware structure schematic diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0056] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0057] In the description of the present application, if there is a description to the first, the second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.

[0058] In the description of the present application, it is to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0059] In the description of the present application, it is to be understood that, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0060] The technical solutions of the present application will be described in detail below in combination with the drawings. Obviously, the following described embodiments are only part of the embodiments of the present application, not all embodiments.

[0061] Figure 1 is a flowchart of the carbon dioxide electromagnetic monitoring identification method of the embodiments of the present application. The following refers to Figure 1 , the embodiments of the present application are further described.

[0062] The embodiments of the present application propose a carbon dioxide electromagnetic monitoring identification method, which comprises the following steps:

[0063] Step 101, under the conditions of multiple groups of preset temperature and pressure conditions and preset oil content conditions, a carbon dioxide core displacement experiment is performed to obtain core resistivity data, which includes core resistivity change data corresponding to each group of preset temperature and pressure conditions and preset oil content conditions;

[0064] Step 102, logging data of the study area is obtained;

[0065] Step 103, according to the logging data, and multiple groups of preset thickness conditions of the target layer and preset resistivity conditions of the target layer, forward modeling is performed to obtain absolute abnormal peak voltage data, which includes absolute abnormal peak voltage corresponding to each group of preset thickness conditions of the target layer and preset resistivity conditions of the target layer;

[0066] Step 104, according to the core resistivity data and the absolute abnormal peak voltage data, absolute abnormal difference voltage data is obtained, which includes absolute abnormal difference voltage corresponding to each group of preset temperature and pressure conditions, preset oil content conditions and preset thickness conditions of the target layer;

[0067] Step 105, according to the preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, a carbon dioxide electromagnetic monitoring identification template is determined, which includes identifiable oil content condition ranges corresponding to each group of preset temperature and pressure conditions and preset thickness conditions of the target layer.

[0068] In the embodiments of the present application, through the carbon dioxide core displacement experiment, the core resistivity change after the carbon dioxide enters the target rock of the study area is found out, and then the absolute abnormal difference voltage caused by the resistivity change is analyzed, the absolute abnormal difference voltage is distinguished according to the preset absolute abnormal difference voltage division standard, and then the feasibility of electromagnetic monitoring identification and the accuracy of the identification result are analyzed and judged, to obtain a carbon dioxide electromagnetic monitoring identification template, i.e., the identifiable core oil content condition range under each temperature and pressure condition. The carbon dioxide electromagnetic monitoring identification is based on this identification template, which can accurately obtain the corresponding target layer core oil content condition range that can be stably identified by using the wide-area electromagnetic method under different target layer temperature and pressure conditions. In addition, the present application provides theoretical support for practical application scenarios such as monitoring the carbon dioxide swept range, storage leakage and real-time monitoring of carbon dioxide breakthrough by the wide-area electromagnetic method, which helps to promote the wide-area electromagnetic method for monitoring the carbon dioxide swept range, and at the same time, the wide-area electromagnetic method for monitoring the carbon dioxide swept range has strong real-time performance, fills the technical gap at home and abroad, and is a new breakthrough.

[0069] The logging data includes, but is not limited to, natural gamma logging, resistivity logging, acoustic time difference logging, density logging, natural potential logging, lithology data, etc. Specific logging data can be selected and used according to actual conditions, and in general, attention is mainly paid to related data of resistivity logging.

[0070] The forward calculation can be wide-area electromagnetic forward calculation.

[0071] In some embodiments, under a plurality of groups of temperature and pressure preset conditions and oil-bearing preset conditions, a carbon dioxide core displacement experiment is performed to obtain core resistivity data, including:

[0072] A plurality of groups of temperature and pressure preset conditions and oil-bearing preset conditions are obtained, and in each group of temperature and pressure preset conditions and oil-bearing preset conditions, the temperature and pressure preset condition includes a group of preset temperature and pressure, and the oil-bearing preset condition includes a preset oil-bearing saturation;

[0073] For each group of temperature and pressure preset conditions and oil-bearing preset conditions, a carbon dioxide core displacement experiment is performed to obtain a group of core resistivity change data corresponding to each group of temperature and pressure preset conditions and oil-bearing preset conditions;

[0074] According to the group of core resistivity change data, the core resistivity data is obtained.

[0075] In this embodiment, for the temperature and pressure conditions and oil-bearing conditions of the target layer of the research area, a plurality of different temperature and pressure conditions and different core oil-bearing saturations are designed, that is, a plurality of groups of temperature and pressure preset conditions and oil-bearing preset conditions, and a carbon dioxide core displacement experiment is performed under each group of conditions. The core resistivity change under different temperature and pressure conditions and core oil-bearing saturations can be obtained.

[0076] The oil-bearing preset condition includes a preset oil-bearing saturation, and the preset oil-bearing saturation can be used to simulate the initial oil-bearing saturation of the research area. The initial oil-bearing saturation refers to the initial oil-bearing saturation in the rock pores during the formation and deposition of the oil reservoir. It represents the proportion of the pore space occupied by oil in the rock when the oil reservoir is formed.

[0077] In some embodiments, a group of core resistivity change data corresponding to a group of temperature and pressure preset conditions and oil-bearing preset conditions includes a group of initial core resistivity and end core resistivity.

[0078] In some embodiments, for each group of temperature and pressure preset conditions and oil-bearing preset conditions, a carbon dioxide core displacement experiment is performed to obtain a group of core resistivity change data corresponding to each group of temperature and pressure preset conditions and oil-bearing preset conditions, which can be a core resistivity monitoring experiment during the carbon dioxide core displacement process.

[0079] The preparation before the experiment includes the following steps:

[0080] In the target layer, a plurality of core plungers are drilled, numbered and then put into a Soxhlet extractor in sequence, and the residual crude oil and inorganic salt are cleaned by using petroleum ether, toluene and ethylene glycol multiple times. Specifically, 10 core plungers with a length of 8 cm and a diameter of 2.5 cm can be drilled in the target layer. It should be noted that the lithology of the core is not limited to dense sandstone, including all lithology types such as igneous rock, shale, mudstone and carbonate rock, and the number of core plungers is not necessarily 10, which can be increased or decreased according to the specific situation.

[0081] It should be noted that the above core refers to the core plunger, and the expression is omitted as the core.

[0082] The cleaned core is put into a thermostat and heated to 120 DEG C for drying, and then the gas logging porosity and permeability of the core are measured.

[0083] The sample with relatively good gas logging porosity and permeability is selected to reduce the difficulty of preparing different oil saturation cores in the subsequent process. To reduce experimental error, 1-2 core samples can be repeatedly tested.

[0084] The formation live oil is used for preparation to establish different oil conditions, that is, to establish different core oil saturation. Specifically, when establishing the core oil saturation, the formation live oil is used for preparation. The formation live oil refers to the formation crude oil rich in multi-component organic gas under the formation temperature and pressure conditions. The formation crude oil forms dead oil after degassing on the ground. Specifically, in the present application, pure methane gas can be used to replace the multi-component organic gas, which is injected into the dead oil obtained from the target layer under the formation temperature and pressure conditions to prepare the target layer live oil. The gas-oil ratio is one of the parameters for measuring whether the live oil preparation meets the standard, which refers to the ratio of the standard volume of the separated gas to the volume of the ground degassing oil (dead oil) after the formation crude oil is degassed on the ground once. The target layer live oil prepared in the present application needs to be within the range of the real gas-oil ratio. In addition, the target layer formation water needs to be repeatedly filtered through 500-3000 mesh filter paper until there is no obvious stain on the filter paper.

[0085] The experimental design includes designing multiple temperature and pressure conditions and multiple oil saturation conditions.

[0086] Specifically, the designed temperature and pressure conditions need to meet the real situation of the target layer and be appropriately expanded on this basis. The core oil saturation S o can be divided into 6 gradients from 0 to 100%, which are 0, 20%, 40%, 60%, 80% and 100% respectively. It should be noted that during the experiment, the higher the oil saturation, the more difficult the preparation, and at the same time, in the actual situation, there are many factors affecting sample preparation, such as high temperature and high pressure environment, the need to overcome the capillary force inside the core, the complex core porosity and permeability conditions and other factors. It is difficult to completely achieve the designed S o , and only the designed S o, cannot be completely consistent.

[0087] The specific steps of starting the experiment are described as follows.

[0088] The main equipment and connection mode of this experiment are shown in Figure 2 To reduce errors, the containers and pipelines used in the experiment were placed in a constant temperature and dry box, and the temperature of the constant temperature box was consistent with the temperature of each test group. The live oil, formation water and carbon dioxide of the target layer were placed in three steel cylinders respectively. The live oil of the target layer was directly injected into the steel cylinder by a high temperature and high pressure sample preparation instrument for storage. The live oil cylinder needed to maintain the pressure corresponding to the experimental group. The cleaned core was placed in the core holder, assembled and added to the confining pressure of 5 MPa. Vacuum was drawn from the inlet end until the pressure difference of the inlet and outlet pressure sensors was 0.1 MPa, and the connected resistance measuring instrument could work normally.

[0089] In order to measure the resistance of the core at both ends, the Hasler core holder was modified in this experiment: the electrode sheet was connected to the metal end of the piston limiting column tail, and the electrode sheet was connected to the resistance measuring instrument. The resistance measuring instrument can monitor the electrical signal in real time and read the resistance value. After the core holder is pressurized, the core is only in contact with the metal surface of the piston limiting column inside the holder, so that the core resistance data can be obtained more truly. In this experiment, the resistance measuring instrument data was read every 30 seconds, and the shorter reading interval can more accurately reflect the electrical properties of the core at both ends. Generally, the core resistivity cannot be directly measured in the experiment, and the core resistivity is calculated by the following formula:

[0090]

[0091] Where, ρ is the core resistivity, unit is Ω·m, R is the core resistance, unit is Ω, r is the core cross section radius, unit is m, and l is the core length, unit is m.

[0092] When providing different oil-bearing conditions, i.e., preparing cores with different oil-bearing saturations, different methods are used. When preparing cores with oil-bearing saturations of 0-60%, a high-pressure pulseless metering pump is opened to pressurize a formation water cylinder to 2 MPa, a liquid sealing valve and a six-way valve B are opened, the core is fully saturated with formation water, the core resistance is measured, and the core is aged for 1 day. Subsequently, live oil is used to displace the formation water in the core under the target temperature and pressure conditions to achieve the expected oil-bearing saturation, and the core is aged for another 1 day. When preparing cores with oil-bearing saturations exceeding 60%, the core dry and wet weight method is used to calculate the difference between the wet weight of the core after being saturated with water and the dry weight of the core, so as to obtain the amount of formation water entering the core. The core saturated with formation water is driven by high-temperature N2 at a constant pressure, and the amount of formation water discharged after the displacement is recorded. When the amount of water driven reaches the expected amount, it is indicated that the core reaches the target water-bearing saturation, and the core resistance is measured and aged for 1 day. Subsequently, the core is vacuumed, the core tail end back pressure valve is closed, petroleum ether is injected at a constant pressure of 2 MPa, the pump position difference is recorded, petroleum ether is displaced by live oil according to the principle of similarity and compatibility, so as to achieve the expected oil-bearing saturation, and then aged for 1 day.

[0093] After the cores with the expected oil-bearing saturations are prepared, carbon dioxide displacement can be performed. First, a steel cylinder containing carbon dioxide is connected to a high-pressure pulseless metering pump for constant pressure displacement with a displacement pressure difference of 2 MPa. Subsequently, the oil production, water production, and gas production are recorded every time 0.1 PV is injected, and the resistance value is continuously monitored every 30 seconds until no oil and water are produced at the outlet end or a large amount of carbon dioxide is emitted. Then, the pressure is safely released, the same core is repeatedly washed with petroleum ether and ethanol, the temperature and pressure conditions or the oil-bearing saturation are changed, and the above test is repeated.

[0094] Specifically, in this experiment, 6 temperature and pressure conditions are designed, and 6 groups of cores with different initial oil-bearing saturations are designed for carbon dioxide displacement test under each temperature and pressure condition to study the change rule of core resistivity, obtain the initial core resistivity, the final core resistivity, and the resistivity change value, which is the absolute value of the difference between the initial core resistivity and the final core resistivity. The experimental results obtained in this experiment, i.e., the core resistivity data, are shown in Table 1, including the initial core resistivity, the final core resistivity, and the resistivity change value corresponding to each temperature and pressure condition under the condition of 6 groups of different initial oil-bearing saturations. Figure 3

[0095] In some embodiments, the logging data includes logging curves;

[0096] According to the logging data, and a plurality of preset conditions of the thickness of the target layer and the resistivity of the target layer, forward modeling is performed to obtain absolute abnormal peak voltage data, including:

[0097] According to the logging curves, a basic geoelectric model is established; ​

[0098] a plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity, wherein the preset conditions of target layer thickness in each set of preset conditions of target layer thickness and preset conditions of target layer resistivity include a preset target layer thickness, and the preset conditions of target layer resistivity include a preset target layer resistivity;

[0099] a plurality of fine geoelectric models are established according to the basic geoelectric model and the plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity;

[0100] forward modeling is performed on each fine geoelectric model to obtain each absolute abnormal peak voltage corresponding to each set of preset conditions of target layer thickness and preset conditions of target layer resistivity;

[0101] absolute abnormal peak voltage data are obtained according to the absolute abnormal peak voltages.

[0102] In the embodiment, the well logging curve is used to establish the basic geoelectric model, different target layer thicknesses and different target layer resistivities are set respectively, the fine geoelectric model is established to perform forward modeling, and the absolute abnormal peak voltage data are obtained to analyze the identification ability of the wide-area electromagnetic method.

[0103] The basic geoelectric model can be established by using various types of well logging curves according to the well logging curve, and specifically, the basic geoelectric model can be established mainly according to the well logging resistivity curve.

[0104] The basic geoelectric model can be established according to the well logging curve, and the stratification results of each layer in the research area can be obtained according to the seismic data interpretation and the well logging data interpretation in the research area, and the top and bottom depth data of each layer and the thickness of each layer can be known. According to the well logging resistivity, the longitudinal variation value of the resistivity of each layer can be known. According to the above data, the basic geoelectric model can be established. It should be noted that in the basic geoelectric model, the resistivity value of the target layer is unknown, and the resistivity values of the remaining layers are known, and the resistivity values and the depths are one-to-one corresponding.

[0105] For example, the stratification information of the strata in the research area is obtained according to the natural gamma ray, acoustic time difference and other well logging data, and the basic geoelectric model is established in combination with the well logging resistivity curve.

[0106] The above obtaining of the multiple sets of preset conditions of the target layer thickness and the preset conditions of the target layer resistivity can be used to design different target layer thicknesses and different target layer resistivities. The target layer thickness can be the reservoir thickness of the target layer. The design of the target layer thickness and the target layer resistivity can refer to the actual situation of the study area. Specifically, the target layer reservoir thickness varies between 2m and 10m, and the model design thickness can cover the actual situation. The actual reservoir resistivity of the target layer varies between 10 and 260Ω·m, but in order to more show the influence of the change of the resistivity, the resistivity of the target layer in the model can be designed to be as high as 400Ω·m.

[0107] For example, the forward simulation of the target layer design thickness and resistivity can be as shown in Figure 4 The reservoir thickness of the target layer is set to 2m, 4m, 6m, 8m and 10m, and the resistivity value of the target layer is set from 10Ω·m to 400Ω·m at intervals of 10Ω·m. Therefore, the designed forward simulation of the target layer includes 5 target layer thicknesses, and in each target layer thickness, 1 set of resistivity experimental groups is set at intervals of 10Ω·m from 10Ω·m to 400Ω·m, i.e. 40 groups, a total of 200 simulation conditions.

[0108] The above forward simulation of each fine geoelectric model, wherein the forward simulation is a commonly used method in geophysical exploration. In the study of geophysical exploration, according to the shape, occurrence and physical property data of the geological body, the theoretical value is calculated by constructing a mathematical model, that is, mathematical simulation, or the numerical value of the geophysical effect produced by the model is observed by constructing a physical model, that is, physical simulation. In this embodiment, a fine geoelectric model has been constructed, the thickness and resistivity of the target layer have been preset, and the longitudinal distribution of the target layer resistivity closest to the actual situation is calculated by using the common finite element method. The finite element method divides the underground medium into multiple small units, each unit satisfies certain boundary conditions and physical properties, and the propagation of seismic waves is simulated by solving the solution of each unit. The above forward simulation can be wide-area electromagnetic forward simulation.

[0109] The above process of obtaining the absolute abnormal peak voltage can be to take the absolute abnormal voltage of the forward simulation of the smallest target layer resistivity as a reference. Specifically, the absolute abnormal voltage U of the forward simulation of 10Ω·m can be taken as a reference to find the maximum absolute abnormal voltage Umax caused by changing the target layer resistivity under the same target layer thickness condition, that is, the absolute abnormal peak voltage corresponding to the preset conditions of the target layer thickness and the preset conditions of the target layer resistivity. Similarly, by changing the target layer thickness, the absolute abnormal voltage U of the forward simulation of 10Ω·m is taken as a reference to find the maximum absolute abnormal voltage Umax caused by other target layer resistivities, that is, the absolute abnormal peak voltage. Finally, the absolute abnormal peak voltage data is obtained as shown in Figure 5As shown, the absolute abnormal peak voltage corresponding to the preset condition of the reservoir thickness and the preset condition of the reservoir resistivity is determined, the reservoir thickness is the preset condition of the target layer thickness, and the reservoir simulation resistivity is the preset condition of the target layer resistivity.

[0110] In some embodiments, each absolute abnormal difference voltage is obtained by the following steps:

[0111] According to the initial core resistivity, the corresponding initial absolute abnormal peak voltage is determined;

[0112] According to the end core resistivity, the corresponding end absolute abnormal peak voltage is determined;

[0113] According to the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage, the corresponding absolute abnormal difference voltage is determined, which is the absolute value of the difference between the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage.

[0114] In this embodiment, according to the initial core resistivity and the end core resistivity obtained from the carbon dioxide displacement experiment, the corresponding absolute abnormal peak voltage is found, that is, the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage, and the absolute abnormal difference voltage is obtained by subtracting and taking the absolute value, and finally the absolute abnormal difference voltage corresponding to each oil saturation of the core under each temperature and pressure condition and the reservoir thickness condition of each target layer is found.

[0115] Specifically, according to Figure 5 The absolute abnormal peak voltage corresponding to the initial core resistivity and the end core resistivity can be found, which is denoted as the initial absolute abnormal peak voltage A and the end absolute abnormal peak voltage B, and the absolute value of the difference between A and B is the absolute abnormal difference voltage.

[0116] For example, in the experimental group with the temperature and pressure condition of 6.78 MPa-20℃ and the initial oil saturation of 0, as shown in Figure 3 The initial core resistivity is 15.5Ω·m, the end core resistivity is 163.7Ω·m, and the resistivity change value is 143.7Ω·m, as shown in Figure 5 In the case where the reservoir thickness of the target layer is 10m, the absolute abnormal peak voltage A corresponding to the initial core resistivity 15.5Ω·m is 7.63μV, and the absolute abnormal peak voltage B corresponding to the end core resistivity 163.7Ω·m is 14.64μV, so the value of B-A is 7.01μV, that is, the absolute abnormal difference voltage is 7.01μV, as shown in Figure 6 .

[0117] It should be noted in the above process that if Figure 3The initial core resistivity and the end core resistivity in the table cannot correspond to the preset target layer resistivity in the simulation condition value, and the value is taken from the nearest value, such as the initial core resistivity 15.5Ω·m taking the value of the simulation target layer 20Ω·m, and the end core resistivity 163.7Ω·m taking the value of the simulation target layer 160Ω·m. Figure 5

[0118] Obtain the corresponding absolute abnormal difference voltage under the condition of the whole reservoir thickness, temperature and pressure, and oil saturation, and obtain the absolute abnormal difference voltage data, as shown in the table, which is the interpretation of the electrical property change after the carbon dioxide is swept into the formation. Figure 6

[0119] In some embodiments, according to the preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, a carbon dioxide electromagnetic monitoring identification template is determined, including:

[0120] Under the same temperature and pressure preset condition and the target layer thickness preset condition, a correlation curve of oil saturation and absolute abnormal difference voltage is drawn.

[0121] According to the absolute abnormal difference voltage division standard and the correlation curve, a corresponding identifiable oil saturation range is obtained, and a carbon dioxide electromagnetic monitoring identification template is determined.

[0122] The above-mentioned drawing of the correlation curve of oil saturation and absolute abnormal difference voltage can be data under the same temperature and pressure preset condition and the target layer thickness preset condition, with oil saturation as the horizontal coordinate and absolute abnormal difference voltage as the vertical coordinate, to draw the correlation curve, as shown in the table, to obtain the intersection graph of absolute abnormal difference voltage and core initial oil saturation under each temperature and pressure condition, and each graph includes a plurality of oil saturation and absolute abnormal difference voltage correlation curves corresponding to a plurality of different target layer thickness preset conditions under a temperature and pressure condition, for example, a graph includes five curves corresponding to the thickness of 2m, 4m, 6m, 8m and 10m of the target layer. Figures 7 to 12 In some embodiments, the absolute abnormal difference voltage division standard includes a basic identifiable absolute abnormal difference voltage division standard and a stable identifiable absolute abnormal difference voltage division standard.

[0123]

[0124] ​​​The above identifiable absolute abnormal difference voltage division standard and the stable identifiable absolute abnormal difference voltage division standard can be set according to actual experimental data, and specifically, 0.5 muV can be taken as the basic identifiable absolute abnormal difference voltage division standard, and 1 muV can be taken as the stable identifiable absolute abnormal difference voltage division standard, the absolute abnormal difference of each test group is divided, and the basic identifiable and stable identifiable core oil saturation range under each temperature and pressure condition is obtained, that is, the identification template.

[0125] Specifically, in the above formula, 0.5 muV is taken as the basic identifiable division standard, that is, the horizontal dashed line in the figure, and 1 muV is taken as the stable identifiable division standard, that is, the horizontal solid line in the figure. Figures 7 to 12 The intersection points of the horizontal dashed line, the horizontal solid line and each correlation curve are determined, and the basic identifiable core initial oil saturation range and the stable identifiable core initial oil saturation range in the carbon dioxide displacement process under each temperature and pressure condition are obtained, and the carbon dioxide electromagnetic monitoring identification template is obtained, as shown in the formula. Figure 13 The above identification template is the capability evaluation identification template for carbon dioxide detection and identification by the electromagnetic method, and by using the above template, it can be known that the core oil saturation of the target layer under different temperature and pressure conditions of the target layer is within which range, the wide-area electromagnetic method can be stably identified, and a bridge between the experimental results and the actual application is established.

[0126] The execution subject of the carbon dioxide electromagnetic monitoring identification method provided in the embodiment of the application can be a carbon dioxide electromagnetic monitoring identification device 200. In the embodiment of the application, the carbon dioxide electromagnetic monitoring identification method is executed by the carbon dioxide electromagnetic monitoring identification device 200, and the carbon dioxide electromagnetic monitoring identification device 200 provided in the embodiment of the application is described.

[0127] Please refer to Figure 14 , which is a structural schematic diagram of a carbon dioxide electromagnetic monitoring identification device 200 provided in the embodiment of the application. As shown in the formula Figure 14 , the carbon dioxide electromagnetic monitoring identification device 200 includes:

[0128] The first obtaining module 201 is configured to perform carbon dioxide core displacement experiments under a plurality of groups of temperature and pressure preset conditions and oil content preset conditions, and obtain core resistivity data, wherein the core resistivity data includes core resistivity change data corresponding to each group of temperature and pressure preset conditions and oil content preset conditions.

[0129] The acquisition module 202 is configured to acquire logging data of a research area.

[0130] The second obtaining module 203 is configured to perform forward calculation according to the logging data and a plurality of sets of preset conditions of the target layer thickness and the target layer resistivity to obtain absolute abnormal peak voltage data, the absolute abnormal peak voltage data including absolute abnormal peak voltages corresponding to each set of preset conditions of the target layer thickness and the target layer resistivity.

[0131] The third obtaining module 204 is configured to obtain absolute abnormal difference voltage data according to the core resistivity data and the absolute abnormal peak voltage data, the absolute abnormal difference voltage data including absolute abnormal difference voltages corresponding to each set of preset conditions of the temperature and pressure, the oil content and the target layer thickness.

[0132] The determining module 205 is configured to determine a carbon dioxide electromagnetic monitoring identification template according to preset absolute abnormal difference voltage division criteria and the absolute abnormal difference voltage data, the carbon dioxide electromagnetic monitoring identification template including an identifiable oil content range corresponding to each set of preset conditions of the temperature and pressure and the target layer thickness.

[0133] In some embodiments, the first obtaining module 201 can be configured to:

[0134] obtain a plurality of sets of preset conditions of the temperature and pressure and the oil content, wherein the preset conditions of the temperature and pressure in each set of preset conditions of the temperature and pressure include a set of preset temperatures and pressures, and the preset conditions of the oil content in each set of preset conditions of the oil content include a preset oil saturation;

[0135] perform carbon dioxide core displacement experiments on each set of preset conditions of the temperature and pressure and the oil content to obtain a plurality of sets of core resistivity change data corresponding to each set of preset conditions of the temperature and pressure and the oil content;

[0136] obtain the core resistivity data according to the plurality of sets of core resistivity change data.

[0137] In some embodiments, the set of core resistivity change data corresponding to each set of preset conditions of the temperature and pressure and the oil content includes a set of initial core resistivity and final core resistivity.

[0138] In some embodiments, the third obtaining module 204 can be configured to:

[0139] determine an initial absolute abnormal peak voltage corresponding to the initial core resistivity;

[0140] determine a final absolute abnormal peak voltage corresponding to the final core resistivity;

[0141] determine an absolute abnormal difference voltage corresponding to the initial absolute abnormal peak voltage and the final absolute abnormal peak voltage, the absolute abnormal difference voltage being an absolute value of a difference between the initial absolute abnormal peak voltage and the final absolute abnormal peak voltage.

[0142] In some embodiments, the determining module 205 can be configured to:

[0143] In the case of the same temperature and pressure preset conditions and preset conditions of the target layer thickness, a correlation curve of oil saturation and absolute abnormal difference voltage is drawn;

[0144] According to the absolute abnormal difference voltage division standard and the correlation curve, a corresponding identifiable oil saturation range is obtained, and a carbon dioxide electromagnetic monitoring identification template is determined.

[0145] In some embodiments, the absolute abnormal difference voltage division standard includes a basic identifiable absolute abnormal difference voltage division standard and a stable identifiable absolute abnormal difference voltage division standard.

[0146] In some embodiments, the well logging data includes well logging curves.

[0147] The second obtaining module 203 can be configured to:

[0148] According to the well logging curves, a basic geoelectric model is established;

[0149] A plurality of sets of preset conditions of the target layer thickness and preset conditions of the target layer resistivity are obtained, and in each set of preset conditions of the target layer thickness and preset conditions of the target layer resistivity, the preset conditions of the target layer thickness include a preset target layer thickness, and the preset conditions of the target layer resistivity include a preset target layer resistivity.

[0150] According to the basic geoelectric model and the plurality of sets of preset conditions of the target layer thickness and preset conditions of the target layer resistivity, a plurality of fine geoelectric models are established;

[0151] Forward modeling is performed on each fine geoelectric model to obtain each absolute abnormal peak voltage corresponding to each set of preset conditions of the target layer thickness and preset conditions of the target layer resistivity.

[0152] According to each absolute abnormal peak voltage, absolute abnormal peak voltage data is obtained.

[0153] Since the carbon dioxide electromagnetic monitoring identification device 200 adopts all the technical solutions of the carbon dioxide electromagnetic monitoring identification method of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and thus will not be described here.

[0154] Figure 15 The hardware structure schematic diagram of the electronic device provided in the embodiments of the present application is shown.

[0155] The electronic device can include a processor 301 and a memory 302 storing computer program instructions.

[0156] In particular, the processor 301 can include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to perform the operations of the embodiments of the application.

[0157] The memory 302 can include mass storage for data or instructions. As an example and not by way of limitation, the memory 302 can include a hard disk drive (HDD), a floppy disk drive, flash memory, an optical disc (e.g., a compact disc (CD) or a digital versatile disc (DVD)), a solid-state drive (SSD), a USB drive, or a combination of two or more of these. Where appropriate, the memory 302 can include removable or non-removable (or fixed) media, where appropriate. Where appropriate, the memory 302 can be internal or external to the integrated gateway disaster recovery device. In some embodiments, the memory 302 is non-volatile, solid-state memory.

[0158] In some embodiments, the memory 302 can include read-only memory (ROM), random-access memory (RAM), a disk storage medium, an optical storage medium, a flash memory device, electrical, optical, or other physical / tangible memory storage device. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software that, when executed (by one or more processors), is operable to perform operations described with reference to the methods according to an aspect of the present disclosure.

[0159] The processor 301 implements the carbon dioxide electromagnetic monitoring and identification method of any one of the above embodiments by reading and executing computer program instructions stored in the memory 302.

[0160] In one example, the electronic device can further include a communication interface 303 and a bus 310. As shown, the processor 301, the memory 302, and the communication interface 303 are connected through the bus 310 and complete communication with each other. Figure 15

[0161] The communication interface 303 is mainly used to realize the communication between the modules, devices, units and / or equipment in the embodiments of the application.

[0162] ​Bus 310 includes hardware, software, or both, to couple components of the online data traffic metering device to each other and to couple components to other components within the online data traffic metering device. While bus 310 is shown for the sake of clarity as a single bus, bus 310 can include one or more buses operating together, serially, in parallel, etc. Bus 310 can include any suitable bus or interconnect, including a memory bus, a peripheral bus, an external bus, a serial bus, a parallel bus, etc. or a combination of one or more of the above. Bus 310 can include any suitable bus or interconnect, including an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand (IB) interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or another suitable bus or interconnect. In some embodiments, bus 310 can include one or more buses, although only one is shown. Although this application describes and illustrates a particular bus, this application contemplates any suitable bus or interconnect.

[0163] The electronic device can execute the carbon dioxide electromagnetic monitoring and identification method in the embodiments of the application, so as to realize the carbon dioxide electromagnetic monitoring and identification method and device described in combination Figure 1 and Figure 14 described in the embodiments of the application.

[0164] In addition, in combination with the carbon dioxide electromagnetic monitoring and identification method in the above embodiments, the embodiments of the application can provide a computer storage medium to realize. The computer storage medium has computer program instructions stored thereon; the computer program instructions are executed by a processor to realize any one of the carbon dioxide electromagnetic monitoring and identification methods in the above embodiments.

[0165] It needs to be clear that the application is not limited to the specific configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after understanding the spirit of the application.

[0166] The functional blocks shown in the structural block diagrams described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, functional cards, and the like. When implemented in software, the elements of the present application are program or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. A "machine-readable medium" includes any medium that can store or transport information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber-optic media, radio frequency (RF) links, and the like. The code segments can be downloaded via computer networks such as the Internet, intranets, and the like.

[0167] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from that in the embodiments, or several steps can be performed simultaneously.

[0168] In addition, the exemplary embodiments mentioned in the present application cannot be regarded as a limitation of the present application, and the specific cases are only to help understand the implementation of the technical solutions of the present patent, and do not constitute a limitation on the protection scope of the claims. Any equivalent replacement, reorganization of technical features, expansion of implementation scenarios or adjustment of technical parameters based on the core idea of the present patent should be regarded as falling within the protection scope of the present patent. Those skilled in the art should understand that the protection scope of the patent should be based on the technical features recorded in the claims and their equivalent features, and the specific process parameters, structural details, material selection and other non-essential technical features recorded in the embodiments of the specification should not be regarded as the basis for limited interpretation. The description of the embodiments of the present patent may have various modifications, and the technical features in different embodiments can be combined and reorganized. These implementation manners derived from the technical idea of the present patent all belong to the scope of the patent claimed by the present patent.

[0169] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0170] The above only is a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described herein. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements shall be covered within the protection scope of the present application.

Claims

1. A method of electromagnetic monitoring identification of carbon dioxide, characterized by, The application relates to a method for determining a carbon dioxide electromagnetic monitoring and identification template. The method comprises the following steps: conducting carbon dioxide core displacement experiments under multiple sets of temperature-pressure preset conditions and oil saturation preset conditions to obtain core resistivity data, wherein the core resistivity data comprises core resistivity change data corresponding to each set of temperature-pressure preset conditions and oil saturation preset conditions; wherein the core resistivity change data corresponding to each set of temperature-pressure preset conditions and oil saturation preset conditions comprises an initial core resistivity and an ending core resistivity; obtaining logging data of a research area; forward modeling according to the logging data and multiple sets of target layer thickness preset conditions and target layer resistivity preset conditions to obtain absolute abnormal peak voltage data, wherein the absolute abnormal peak voltage data comprises absolute abnormal peak voltages corresponding to each set of target layer thickness preset conditions and target layer resistivity preset conditions; obtaining absolute abnormal difference voltage data according to the core resistivity data and the absolute abnormal peak voltage data, wherein the absolute abnormal difference voltage data comprises absolute abnormal difference voltages corresponding to each set of temperature-pressure preset conditions, oil saturation preset conditions and target layer thickness preset conditions; determining a carbon dioxide electromagnetic monitoring and identification template according to a preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, wherein the carbon dioxide electromagnetic monitoring and identification template comprises identifiable oil saturation condition ranges corresponding to each set of temperature-pressure preset conditions and target layer thickness preset conditions; wherein each absolute abnormal difference voltage is obtained by the following steps: determining an initial absolute abnormal peak voltage corresponding to the initial core resistivity; determining an ending absolute abnormal peak voltage corresponding to the ending core resistivity; 2. The method of claim 1, wherein, determining the absolute abnormal difference voltage corresponding to the initial absolute abnormal peak voltage and the ending absolute abnormal peak voltage, wherein the absolute abnormal difference voltage is the absolute value of the difference between the initial absolute abnormal peak voltage and the ending absolute abnormal peak voltage. The method for determining a carbon dioxide electromagnetic monitoring and identification template comprises the following steps: obtaining multiple sets of temperature-pressure preset conditions and oil saturation preset conditions, wherein the temperature-pressure preset conditions in each set of temperature-pressure preset conditions and oil saturation preset conditions comprise a set of preset temperature and pressure, and the oil saturation preset conditions comprise a preset oil saturation; conducting carbon dioxide core displacement experiments on each set of temperature-pressure preset conditions and oil saturation preset conditions to obtain core resistivity change data corresponding to each set of temperature-pressure preset conditions and oil saturation preset conditions; 3. The method of claim 2, wherein, obtaining core resistivity data according to the core resistivity change data. The method for determining a carbon dioxide electromagnetic monitoring and identification template comprises the following steps: drawing a correlation curve of the oil saturation and the absolute abnormal difference voltage under the same temperature-pressure preset conditions and target layer thickness preset conditions. According to the absolute abnormal difference voltage division standard and the correlation curve, a corresponding identifiable oil saturation range is obtained, and a carbon dioxide electromagnetic monitoring identification template is determined.

4. The method according to claim 1 or 3, characterized in that, The absolute abnormal difference voltage division standard includes a basic identifiable absolute abnormal difference voltage division standard and a stable identifiable absolute abnormal difference voltage division standard.

5. The method of claim 1, wherein, The logging data includes a logging curve. The forward calculation according to the logging data and a plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity includes: According to the logging curve, a basic geoelectric model is established. A plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity are obtained, wherein the preset conditions of target layer thickness in each set of preset conditions of target layer thickness and preset conditions of target layer resistivity include a preset target layer thickness, and the preset conditions of target layer resistivity include a preset target layer resistivity. According to the basic geoelectric model and the plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity, a plurality of fine geoelectric models are established. The forward calculation of each fine geoelectric model obtains an absolute abnormal peak voltage corresponding to each set of preset conditions of target layer thickness and preset conditions of target layer resistivity. The absolute abnormal peak voltage data is obtained according to each absolute abnormal peak voltage.

6. A carbon dioxide electromagnetic monitoring identification device, characterized by, The first obtaining module is configured to perform a carbon dioxide core displacement experiment under a plurality of sets of preset conditions of temperature and pressure and preset conditions of oil content, and obtain core resistivity data, wherein the core resistivity data includes core resistivity change data corresponding to each set of preset conditions of temperature and pressure and preset conditions of oil content; and each set of core resistivity change data corresponding to each set of preset conditions of temperature and pressure and preset conditions of oil content includes an initial core resistivity and a final core resistivity. The obtaining module is configured to obtain logging data of a study area. The second obtaining module is configured to perform forward calculation according to the logging data and a plurality of sets of preset conditions of target layer thickness and preset conditions of target layer resistivity, and obtain absolute abnormal peak voltage data, wherein the absolute abnormal peak voltage data includes an absolute abnormal peak voltage corresponding to each set of preset conditions of target layer thickness and preset conditions of target layer resistivity. The third obtaining module is configured to obtain absolute abnormal difference voltage data according to the core resistivity data and the absolute abnormal peak voltage data, wherein the absolute abnormal difference voltage data includes an absolute abnormal difference voltage corresponding to each set of preset conditions of temperature and pressure, preset conditions of oil content, and preset conditions of target layer thickness. The determining module is configured to determine a carbon dioxide electromagnetic monitoring identification template according to a preset absolute abnormal difference voltage division standard and the absolute abnormal difference voltage data, wherein the carbon dioxide electromagnetic monitoring identification template includes an identifiable oil content condition range corresponding to each set of preset conditions of temperature and pressure and preset conditions of target layer thickness. Each absolute abnormal difference voltage is obtained by the following steps: ​ determining a corresponding initial absolute abnormal peak voltage according to the initial core resistivity; determining a corresponding end absolute abnormal peak voltage according to the end core resistivity; determining a corresponding absolute abnormal difference voltage according to the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage, the absolute abnormal difference voltage being an absolute value of a difference between the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage.

7. An electronic device, comprising: The method comprises the steps of: determining a corresponding initial core resistivity according to a core resistivity of a core sample at an initial time point; determining a corresponding end core resistivity according to a core resistivity of the core sample at an end time point; determining a corresponding initial absolute abnormal peak voltage according to the initial core resistivity; determining a corresponding end absolute abnormal peak voltage according to the end core resistivity; determining a corresponding absolute abnormal difference voltage according to the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage, the absolute abnormal difference voltage being an absolute value of a difference between the initial absolute abnormal peak voltage and the end absolute abnormal peak voltage.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions for causing a computer to perform the method of electromagnetic monitoring and identification of carbon dioxide according to any one of claims 1 to 5.

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