Sealing evaluation method, system, electronic equipment and computer readable storage medium for reservoir geologic body trap sealing carbon dioxide

Abstract

This invention discloses a method, system, electronic device, and computer-readable storage medium for evaluating the sealing performance of carbon dioxide traps in oil reservoirs. The method includes: clarifying the sealing mechanism of the target oil reservoir's carbon dioxide trap geological body and identifying the main controlling factors affecting sealing performance; constructing a scoring-based sealing performance evaluation system and establishing a correspondence table of scores, sealing performance levels, effects, and engineering quality; determining sealing performance evaluation indicators and the weight of each indicator; analyzing the sealing performance under different indicator parameter variations and determining the sealing performance score corresponding to the value range of each indicator's classification parameter; determining sealing performance correction indicators and the corresponding discount scores for each sealing performance correction indicator; sampling and testing the target oil reservoir geological body to obtain the main parameters affecting sealing performance, calculating the sealing performance score, evaluating the sealing effect, and further evaluating the engineering quality. This invention can comprehensively and accurately evaluate the sealing performance of oil reservoirs' carbon dioxide trap geological bodies from multiple perspectives.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide sequestration sealing performance evaluation technology, and more specifically, to a method, system, electronic device, and computer-readable storage medium for evaluating the sealing performance of carbon dioxide sequestration in oil reservoir geological traps. Background Technology

[0002] Carbon dioxide capture, utilization, and storage (CCUS) is an important means of achieving strategic goals, with carbon dioxide flooding (reservoir carbon dioxide sequestration) being the most important method of carbon dioxide utilization. In recent years, geological carbon dioxide sequestration has received widespread attention due to its enormous sequestration potential, high added value, and relatively high security. Geological carbon dioxide sequestration in oil reservoirs simultaneously enhances oil production through oil displacement and achieves carbon burial and storage. Oil reservoirs under complex fault-block conditions exhibit highly complex strata, structures, and reservoir conditions, mainly manifested in: first, unstable strata thickness, rapid changes in lithofacies, and difficulties in stratigraphic correlation; second, highly developed faults and complex structures; and third, significant differences in reservoir burial depth and complex oil-water relationships. These complex geological conditions, combined with long-term exploitation, result in numerous fractures within the reservoir, severely impacting the sealing performance of carbon dioxide sequestration.

[0003] China's domestic carbon dioxide sequestration (COD) reservoirs are still in the development and construction stage. Due to the unique creep properties of sandstone and mudstone, as well as a series of problems arising from differences in geological conditions, research on the geological sealing performance of COD reservoirs is crucial. Large-scale COD injection into formations is prone to leakage problems, especially through caprocks and faults, including capillary leakage, hydraulic fracturing of caprocks, and leakage along existing faults. The COD sequestration process is a coupled process of fluid seepage and reservoir deformation, which can disturb the original formation, trigger caprock fracturing, fault activation, and lead to COD leakage. Therefore, research on the geological sealing mechanism and evaluation system of COD sequestration in oil reservoirs has significant theoretical importance and broad application prospects for the efficient utilization and development of oil reservoirs.

[0004] Currently, the geological sealing performance evaluation for carbon dioxide sequestration in oil reservoirs includes caprock sealing performance evaluation and fault sealing performance evaluation. Caprock sealing performance is evaluated from three aspects: macroscopic sealing performance, microscopic sealing performance, and mechanical integrity, while fault sealing performance is evaluated from two aspects: dynamic sealing performance and static sealing performance. However, when oil reservoirs are sequestering carbon dioxide under complex geological conditions, evaluating their sealing performance solely from the perspective of caprock or fault is not entirely accurate.

[0005] Therefore, how to accurately evaluate the sealing performance of the geological body for carbon dioxide sequestration in oil reservoirs from all aspects and multiple perspectives has become an urgent technical problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a method for accurately evaluating the sealing performance of geological bodies that contain carbon dioxide in oil reservoirs from all aspects and multiple perspectives.

[0007] The first aspect of this invention provides a method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, comprising:

[0008] Step S1: Identify the sealing mechanism of the geological body that stores carbon dioxide in the target reservoir and determine the main controlling factors affecting sealing performance;

[0009] Step S2: Construct a rating-based sealing performance evaluation system and establish a table corresponding to scores, sealing performance levels, effects, and engineering quality;

[0010] Step S3: Determine the sealing performance evaluation indicators and the weight of each indicator;

[0011] Step S4: Analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​for each index category parameter;

[0012] Step S5: Determine the sealing performance correction index and the corresponding discount score for each sealing performance correction index;

[0013] Step S6: Sampling and testing of the target reservoir geological body to obtain the main parameters affecting sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

[0014] Optionally, in step S1, clarifying the sealing mechanism of the geological body that sequesters carbon dioxide in the target reservoir includes: analyzing the caprock sealing mechanism of the geological body of the target reservoir and analyzing the fault sealing mechanism of the geological body of the target reservoir.

[0015] Optionally, in step S1, after determining the main controlling factors affecting the sealing performance, a sensitivity analysis of the main controlling factors affecting the sealing performance is also included:

[0016] The sensitive factors affecting sealing performance were analyzed by combining on-site investigation, indoor experiments and numerical simulation, and then the sealing performance evaluation index and parameters were determined. At the same time, the range of values ​​for classification parameters was determined according to the different degrees to which different indexes affect sealing performance.

[0017] Optionally, in step S3, the sealing performance evaluation index includes six indicators: rock porosity and permeability characteristics, caprock thickness, rock mechanical properties, formation integrity, formation pressure, and storage area environment. Based on the different degrees of influence of different indicator parameters on sealing performance, the weights of the six indicators are determined according to their importance.

[0018] Optionally, the evaluation of rock porosity and permeability characteristics includes three parameters: porosity, permeability, and pore radius; the evaluation of caprock thickness includes two parameters: cumulative caprock thickness to the surface and main caprock thickness.

[0019] The evaluation of rock mechanical properties includes two parameters: uniaxial compressive strength and breakthrough pressure.

[0020] Formation integrity assessment includes two parameters: the development of fractures in the caprock and the extent of reservoir covered by the caprock; formation pressure includes two parameters: formation pressure and reservoir pressure coefficient.

[0021] The environmental assessment of the sealed area includes two parameters: temperature and geothermal gradient ratio.

[0022] Optionally, rock porosity and permeability characteristics, caprock thickness, rock mechanical properties, formation pressure, and the environment of the storage area can be used as quantitative evaluation indicators.

[0023] The integrity of the caprock is a qualitative evaluation indicator;

[0024] The development of faults serves as a sealing correction index.

[0025] Optionally, fault development includes two indicators: fault size and fault mechanical properties, and fault gouge ratio.

[0026] The second aspect of this invention discloses a system for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, the system comprising:

[0027] The first processing module is configured to clarify the sealing mechanism of the geological body for carbon dioxide sequestration in the target reservoir and determine the main controlling factors affecting sealing performance.

[0028] The second processing module is configured to construct a scoring-based sealing performance evaluation system and establish a correspondence table of scores, sealing performance levels, effects, and engineering quality.

[0029] The third processing module is configured to determine the sealing performance evaluation indicators and the weight of each indicator.

[0030] The fourth processing module is configured to analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​of each index category parameter.

[0031] The fifth processing module is configured to determine the sealing performance correction index and the discount score corresponding to each sealing performance correction index;

[0032] The sixth processing module is configured to sample and test the geological body of the target oil reservoir, obtain the main parameters affecting the sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

[0033] The third aspect of the present invention discloses an electronic device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps in the method for evaluating the sealing performance of a reservoir geological trap for carbon dioxide storage according to any one of the first aspects of the present invention.

[0034] The fourth aspect of the present invention discloses a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for evaluating the sealing performance of a reservoir geological trap for carbon dioxide storage according to any one of the first aspects of the present invention.

[0035] According to the technical content disclosed in this invention, the following beneficial effects are achieved:

[0036] This invention, based on the sealing mechanism of carbon dioxide sequestration in oil reservoirs, clarifies the main controlling factors affecting sealing performance and establishes a multi-index, multi-perspective evaluation system for the sealing performance of carbon dioxide sequestration in oil reservoirs. It analyzes the impact of different parameter variations on sealing performance, using this as the basis for the sealing performance score for different parameters. This overcomes the shortcomings of conventional evaluation methods that only consider single factors or single indicators. Combined with actual engineering site conditions, it conducts scoring and correction evaluations of geological body sealing performance, improving the accuracy of sealing performance evaluation. This provides technical support and reference for the sealing performance evaluation of carbon dioxide sequestration in oil reservoirs and has significant application value for the development of carbon dioxide sequestration engineering.

[0037] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0039] Figure 1 This is a geological model diagram of a fault-block oil reservoir in an oilfield for carbon dioxide sequestration, as described in an embodiment of the present invention.

[0040] Figure 2 This is a cross-sectional view of an injection well reservoir containing a fault in a fault block of an oilfield, as described in an embodiment of the present invention.

[0041] Figure 3 This is a flowchart of the method for evaluating the sealing performance of carbon dioxide trapping in oil reservoirs according to the present invention. Detailed Implementation

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0044] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0045] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0047] See Figure 3 The first aspect of this invention provides a method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, comprising:

[0048] Step S1: Clarify the sealing mechanism of the geological body that stores carbon dioxide in the target oil reservoir and determine the main controlling factors affecting sealing performance; among which, clarifying the sealing mechanism of the geological body that stores carbon dioxide in the target oil reservoir includes: analyzing the caprock sealing mechanism of the geological body of the target oil reservoir and analyzing the fault sealing mechanism of the geological body of the target oil reservoir.

[0049] Furthermore, after identifying the main controlling factors affecting sealing performance, sensitivity analysis is also conducted on these factors. This sensitivity analysis mainly involves using a combination of on-site investigation, indoor experiments, and numerical simulation to analyze the sensitive factors affecting sealing performance, thereby determining the sealing performance evaluation indicators and parameters. At the same time, the range of values ​​for the classification parameters is determined based on the different degrees to which different indicators affect sealing performance.

[0050] Step S2: Construct a rating-based sealing performance evaluation system and establish a correspondence table of scores, sealing performance levels, effects, and engineering quality. The rating-based sealing performance evaluation system is a sealing performance evaluation system with a full score of 100 points, including evaluation indicators and correction indicators. The correspondence table of scores, sealing performance levels, effects, and engineering quality is divided into 5 sealing performance levels, 5 types of sealing performance effects, and 5 types of engineering quality according to the score range, with 20 points as each gradient.

[0051] Step S3: Determine the sealing performance evaluation indicators and the weight of each indicator;

[0052] Furthermore, the sealing performance evaluation index includes six indicators: rock porosity and permeability characteristics, caprock thickness, rock mechanical properties, formation integrity, formation pressure, and the environment of the sealing area. Based on the varying degrees of influence of different indicator parameters on sealing performance, the weights of the six indicators are determined according to their importance. Specifically, rock porosity and permeability characteristics account for 30 points, caprock thickness for 25 points, rock mechanical properties for 15 points, formation integrity for 15 points, formation pressure for 10 points, and the environment of the sealing area for 5 points, for a total score of 100 points.

[0053] Among them, the evaluation of rock porosity and permeability characteristics includes three parameters: porosity, permeability, and pore radius; the evaluation of caprock thickness includes two parameters: cumulative caprock thickness to the surface and main caprock thickness.

[0054] The evaluation of rock mechanical properties includes two parameters: uniaxial compressive strength and breakthrough pressure.

[0055] The expression for the breakthrough pressure Pd is:

[0056]

[0057] In the formula, P d - Breakthrough pressure, unit MPa; σ - Interfacial tension, unit N / m; θ - Contact angle, unit °; r0 - Minimum pore throat radius, unit m; H - Cap layer thickness, unit m; v - CO2 velocity in the cap layer, unit m / s; λ1 - Adsorption resistance coefficient, dimensionless; λ2 - Friction resistance coefficient, dimensionless.

[0058] Formation integrity assessment includes two parameters: the development of fractures in the caprock and the extent of reservoir covered by the caprock; formation pressure includes two parameters: formation pressure and reservoir pressure coefficient.

[0059] The environmental assessment of the sealed area includes two parameters: temperature and geothermal gradient ratio.

[0060] It should be noted that rock porosity and permeability characteristics, caprock thickness, rock mechanical properties, formation pressure, and sealing area environment are quantitative evaluation indicators; caprock integrity is a qualitative evaluation indicator; and fault development is a sealing performance correction indicator used to correct the sealing performance evaluation score. Fault development includes two indicators: fault size and fault mechanical properties, and fault gouge ratio.

[0061] Step S4: Analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​for each index category parameter;

[0062] Specifically, experiments and numerical simulations are used to analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​for each index classification parameter.

[0063] Step S5: Determine the sealing performance correction index and the corresponding discount score for each sealing performance correction index;

[0064] Specifically, the classification and discount value of the sealing performance correction index are determined, and the score is corrected based on parameters such as the fault size and mechanical properties of the fault, and the fault gouge ratio within a 25km range of the injection well. No points are deducted if there is no fault development.

[0065] More specifically, the sealing score is adjusted according to the fault development. If there is a tensile continuous fault within a 25km radius of the injection well that facilitates fluid flow and the fault gouge ratio is <50%, deduct 80 points. If there is a compressive continuous fault within a 25km radius of the injection well and the fault gouge ratio is between 50% and 60%, deduct 60 points. If the faults within a 25km radius of the injection well are all small in scale and the fault gouge ratio is between 60% and 75%, deduct 40 points. If the faults within a 25km radius of the injection well are associated faults or non-continuous faults and the fault gouge ratio is between 75% and 90%, deduct 20 points. No points are deducted if there is no fault development.

[0066] Step S6: Sampling and testing of the target reservoir geological body to obtain the main parameters affecting sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

[0067] Specifically, the rock samples from the caprock and reservoir of the oil reservoir storage area are tested, and the main parameters affecting sealing performance are obtained using indoor experimental methods. The sealing performance score is calculated based on the specific situation (the score is calculated by referring to the sealing performance evaluation table), and the sealing effect is comprehensively evaluated. In addition, the project quality is evaluated (the final sealing performance level, effect and project quality are obtained after correcting the score according to the oil reservoir fault development). The geological sealing performance results of carbon dioxide storage in the target oil reservoir are obtained.

[0068] When the quantitative, qualitative, and correction index classification parameters are within the following ranges, the sealing performance score of the target reservoir's carbon dioxide sequestration geological body is considered to be full:

[0069] The target reservoir has a rock permeability of <0.01 mD;

[0070] The target reservoir rock porosity is <3%;

[0071] The target reservoir rock pore radius is <0.01μm;

[0072] The cumulative caprock thickness from the target reservoir to the surface is >300m;

[0073] The main caprock thickness of the target reservoir is >60m;

[0074] The uniaxial compressive strength of the target reservoir rock is >30 MPa;

[0075] The target reservoir caprock breakthrough pressure is >24 MPa;

[0076] The target reservoir caprock has no fracture development.

[0077] The target reservoir caprock completely covers the reservoir area.

[0078] Target reservoir formation pressure > 40 MPa;

[0079] The reservoir pressure coefficient of the target oil reservoir is <0.9;

[0080] The target reservoir temperature is between 90℃ and 120℃;

[0081] The geothermal gradient of the target reservoir is less than 30℃ / Km;

[0082] There are no faults in the target reservoir area. Specific implementation examples:

[0084] Taking a fault-block reservoir area in a certain oilfield as an example, this fault block consists of fractured tight sandstone and mudstone reservoirs, with a particularly significant influence from the complex tectonic background. The block contains 15 wells in total: 6 carbon dioxide injection wells and 9 production wells. Its geological model is as follows: Figure 1 As shown.

[0085] With the goal of obtaining the evaluation index parameters in Table 1, representative core samples from the caprock, fault, and reservoir areas within the oil reservoir were taken to conduct rock physics experiments and measure the target parameters. Simultaneously, combining well logging interpretation, seismic interpretation, exploration, and numerical simulation methods, the thickness of the caprock, rock parameters, and fault development within the area were clarified.

[0086] Table 1. Classification and Scoring Table of Sealing Performance Evaluation Indicators

[0087]

[0088]

[0089] The parameters and scores for each indicator in this region are as follows:

[0090] Rock porosity and permeability characteristics T1: Rock permeability is 0.015 mD, porosity is 1.45%, pore radius is 0.02 μm, 27 minutes;

[0091] Cover thickness T2: The cumulative thickness of the cover layer to the ground surface is much greater than 300m, and the thickness of the main cover layer is about 110m, 25 points;

[0092] Rock mechanical properties T3: The uniaxial compressive strength of the rock is 70.9 MPa, the rock breakthrough pressure is 44 MPa, and the score is 15 points.

[0093] Formation integrity T4: The fracture development is characterized by the presence of minor fractures, and the caprock covers more than 95% of the carbon dioxide plume within the reservoir, 12 points;

[0094] Formation pressure T5: Formation pressure is 45 MPa, reservoir pressure coefficient is 0.9, 10 points;

[0095] Environment T6 in the storage area: The temperature in the storage area is 117℃, the geothermal gradient is 29.25℃ / Km, 5 points;

[0096] Table 2. Classification and Scoring Table of Sealing Performance Correction Indicators

[0097]

[0098] The sealing performance evaluation index for the carbon dioxide sequestration geological body of this oil reservoir scored 94 points. The score was then corrected according to the correction index in Table 2. The fault development situation in this area is as follows: Figure 2 As shown, a small fault exists within 25 kN of the injection well. This fault does not connect to the shallow surface, and the mud ratio is between 75% and 90%, resulting in a correction score of -20 points. Therefore, the final geological sealing score for this area is 74 points, corresponding to Level II in Table 3, indicating good sealing performance and high engineering quality. Table 4 presents the geological sealing performance evaluation results for carbon dioxide sequestration in a fault-block reservoir of an oilfield in this embodiment.

[0099] Table 3. Correspondence between Sealing Performance Score, Grade, Effect, and Engineering Quality

[0100] Rating value Sealing rating Sealing effect Engineering quality [81，100] I Excellent sealing The project quality is extremely high. [61，80] II Good sealing performance High quality of engineering [41，60] III The sealing performance is average. The quality of the project is average. [21，40] IV Poor sealing performance Poor engineering quality [1，20] V Very poor sealing The quality of the project was extremely poor.

[0101] Table 4. Evaluation results of the geological sealing performance of a fault-block reservoir in an oilfield for carbon dioxide sequestration in Example 1.

[0102]

[0103]

[0104] The second aspect of this invention discloses a system for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, the system comprising:

[0105] The first processing module is configured to clarify the sealing mechanism of the geological body for carbon dioxide sequestration in the target reservoir and determine the main controlling factors affecting sealing performance.

[0106] The second processing module is configured to construct a scoring-based sealing performance evaluation system and establish a correspondence table of scores, sealing performance levels, effects, and engineering quality.

[0107] The third processing module is configured to determine the sealing performance evaluation indicators and the weight of each indicator.

[0108] The fourth processing module is configured to analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​of each index category parameter.

[0109] The fifth processing module is configured to determine the sealing performance correction index and the discount score corresponding to each sealing performance correction index;

[0110] The sixth processing module is configured to sample and test the geological body of the target oil reservoir, obtain the main parameters affecting the sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

[0111] In summary, the evaluation method provided by this invention studies the sealing mechanism of carbon dioxide storage in oil reservoirs and the main controlling factors affecting sealing performance; it combines experiments to establish a numerical model to analyze the degree of influence of different parameter changes on sealing performance, and uses this as the basis for the sealing performance score of different parameters; it divides the faults into four levels based on the fault development situation to correct the sealing performance; and based on the above research process, it establishes a geological body sealing performance evaluation system for carbon dioxide storage in oil reservoirs, thereby promoting new progress in the research of sealing performance evaluation methods.

[0112] This invention is based on the sealing mechanism of carbon dioxide sequestration in oil reservoirs, identifies the main controlling factors affecting sealing performance, and establishes a multi-index, multi-angle evaluation system for the sealing performance of carbon dioxide sequestration in oil reservoirs. This invention overcomes the shortcomings of conventional evaluation methods that only consider single factors or single indicators. Combined with the actual situation on the engineering site, a series of qualitative, quantitative, and corrective evaluations of the sealing performance of geological bodies are carried out, improving the accuracy of sealing performance evaluation. This invention provides technical support and reference for the sealing performance evaluation of carbon dioxide sequestration in oil reservoirs and has great application value for the development of carbon dioxide sequestration engineering.

[0113] A third aspect of this invention discloses an electronic device. The electronic device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, as disclosed in any of the first aspects of this invention.

[0114] The electronic device includes a processor, memory, communication interface, display screen, and input device connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, Near Field Communication (NFC), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the device's casing, or an external keyboard, touchpad, or mouse.

[0115] A fourth aspect of this invention discloses a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs, as disclosed in any of the first aspects of this invention.

[0116] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0117] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for evaluating the sealing property of a trap of a geological body of a reservoir for storing carbon dioxide, characterized by, include: Step S1: Identify the sealing mechanism of the geological body that stores carbon dioxide in the target reservoir and determine the main controlling factors affecting sealing performance; Step S2: Construct a scoring-based sealing performance evaluation system and establish a table corresponding to scores, sealing performance levels, effects, and engineering quality; Step S3: Determine the sealing performance evaluation indicators and the weight of each indicator; Step S4: Analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​for each index category parameter; Step S5: Determine the sealing performance correction index and the corresponding discount score for each sealing performance correction index; Step S6: Sampling and testing of the target reservoir geological body to obtain the main parameters affecting sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

2. The method for evaluating the sealability of a trap for storing carbon dioxide in a reservoir geobody according to claim 1, characterized by, In step S1, the sealing mechanism of the geological body for carbon dioxide sequestration in the target oil reservoir includes: analyzing the caprock sealing mechanism of the geological body of the target oil reservoir and analyzing the fault sealing mechanism of the geological body of the target oil reservoir.

3. The method for evaluating the sealability of a trap for storing carbon dioxide in a geologic body of an oil reservoir according to claim 1 or 2, characterized by, In step S1, after determining the main controlling factors affecting the sealing performance, the method further includes conducting a sensitivity analysis on the main controlling factors affecting the sealing performance: The sensitive factors affecting sealing performance were analyzed by combining on-site investigation, indoor experiments and numerical simulation, and then the sealing performance evaluation index and parameters were determined. At the same time, the range of values ​​for classification parameters was determined according to the different degrees to which different indexes affect sealing performance.

4. The method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs according to claim 2, characterized in that: In step S3, the sealing performance evaluation index includes six indicators: rock porosity and permeability characteristics, caprock thickness, rock mechanical properties, formation integrity, formation pressure, and sealing area environment. Based on the different degrees of influence of different indicator parameters on sealing performance, the weights of the six indicators are determined according to their importance.

5. The method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs according to claim 4, characterized in that: The evaluation of rock porosity and permeability characteristics includes three parameters: porosity, permeability, and pore radius. The evaluation of cap layer thickness includes two parameters: cumulative cap layer thickness to the surface and main cap layer thickness. The evaluation of rock mechanical properties includes two parameters: uniaxial compressive strength and breakthrough pressure. The formation integrity assessment includes two parameters: the development of fractures in the caprock and the extent of reservoirs covered by the caprock. The formation pressure includes two parameters: formation pressure and reservoir pressure coefficient. The environmental assessment of the sealed area includes two parameters: temperature and geothermal gradient ratio.

6. The method of claim 5, wherein the method is characterized by: The rock porosity and permeability characteristics, the caprock thickness, the rock mechanical properties, the formation pressure, and the environment of the storage area are used as quantitative evaluation indicators. The integrity of the cap layer is a qualitative evaluation indicator; The fault development status is a sealing correction index.

7. The method for evaluating the sealing performance of carbon dioxide traps in oil reservoirs according to claim 6, characterized in that, The development of the fault includes two indicators: fault size and fault mechanical properties, and fault gouge ratio.

8. A system for evaluating the sealing property of a trap for storing carbon dioxide in a geological body of an oil reservoir, characterized by, The system includes: The first processing module is configured to clarify the sealing mechanism of the geological body for carbon dioxide sequestration in the target reservoir and determine the main controlling factors affecting sealing performance. The second processing module is configured to construct a scoring-based sealing performance evaluation system and establish a table corresponding to scores, sealing performance levels, effects, and engineering quality. The third processing module is configured to determine the sealing performance evaluation indicators and the weight of each indicator. The fourth processing module is configured to analyze the sealing performance under different index parameters and determine the sealing performance score corresponding to the range of values ​​of each index category parameter. The fifth processing module is configured to determine the sealing performance correction index and the discount score corresponding to each sealing performance correction index; The sixth processing module is configured to sample and test the geological body of the target oil reservoir, obtain the main parameters affecting the sealing performance, calculate the sealing performance score, evaluate the sealing effect, and then evaluate the project quality.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, it implements the steps in the method for evaluating the sealing performance of a reservoir geological body trap for carbon dioxide as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the method for evaluating the sealing performance of a reservoir geological body trap for carbon dioxide as described in any one of claims 1 to 7.

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