Large-scale energy chemical engineering base CO2 salt water layer storage site selection method

Abstract

The invention belongs to the technical field of CO2 energy conservation and emission reduction, and particularly relates to a large energy chemical base CO2 salt water layer storage site selection method. Comprising a plurality of first-level indexes, each first-level index comprises a plurality of second-level indexes, each second-level index comprises one or more third-level indexes, the first-level indexes comprise storage conditions, geological safety, energy development influence and ground geological conditions, and the second-level indexes comprise storage conditions, geological safety, energy development influence and ground geological conditions; each third-level index has a classification or quantification data range; preliminarily determining a site selection range according to the index system; and selecting each classification and each quantitative data range, and determining a CO2 salt water layer storage site. According to the method, the index system is established for the energy and chemical industry base, and the classified or specific quantitative data range is set for each index, so that the site selection process is objective and scientific and meets the actual requirements on the basis of data instead of subjective judgment of people.

Description

Technical Field

[0001] This application belongs to the field of CO2 energy conservation and emission reduction technology, specifically involving a method for site selection of CO2 saline aquifer sealing in a large-scale energy and chemical industry base. Background Technology

[0002] CO2 geological storage is considered a highly promising CO2 emission reduction technology. It refers to the industrial process of separating and purifying CO2 from industrial emission sources, then pressurizing and storing it underground, thus isolating CO2 from the atmosphere for a long period to achieve CO2 emission reduction. The Intergovernmental Panel on Climate Change (IPCC), in its Special Report on Global Warming to 1.5 Degrees Celsius, assessed 90 scenarios, almost all of which required CO2 geological storage technology to limit global warming to within 1.5 degrees Celsius. CO2 geological storage includes saline aquifer storage, abandoned oil and gas reservoir storage, unminable coal seam storage, and basalt mineralization storage. The China Geological Survey has assessed the CO2 geological storage potential of major sedimentary basins in my country, finding that saline aquifer storage has enormous potential, accounting for over 90% of the total potential. However, because numerous factors influence the site selection for CO2 saline aquifer storage, and there is currently no unified methodology or standard, the site selection process often suffers from incomplete consideration of influencing factors and significant influence from subjective preferences.

[0003] The closest technical solution involves assigning weights to various evaluation indicators of potential saline aquifers and conducting quantitative assessments based on expert evaluation methods, then selecting sites according to the comprehensive evaluation scores. However, this method suffers from relatively crude quantitative standards for the evaluation indicators, making the expert evaluation method highly subjective. Furthermore, it fails to design suitable evaluation standards for large-scale energy and chemical bases with more complex geological conditions, concentrated carbon emission sources, and severe conflicts over mining rights compared to ordinary areas. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art or related technologies, namely, the problem that the site selection process for CO2 saline aquifer storage is too subjective and the evaluation criteria are not suitable for large-scale energy and chemical industry bases.

[0005] In view of this, the present invention provides a method for site selection of CO2 saline aquifers for large-scale energy and chemical industry bases. This method establishes an indicator system based on the actual conditions of large-scale energy and chemical industry bases, and classifies each indicator or sets specific quantitative data ranges, so that the site selection of CO2 saline aquifers is based on data, and the site selection process is objective and meets actual needs.

[0006] Specifically, the following technical solutions are included:

[0007] According to an embodiment of this application, a method for site selection of CO2 saline aquifer storage in a large-scale energy and chemical industry base is provided. The method includes: establishing an index system for CO2 saline aquifer storage site selection, wherein the index system includes multiple primary indicators, each primary indicator includes multiple secondary indicators, and each secondary indicator includes one or more tertiary indicators. The primary indicators include: reservoir conditions, geological safety, energy development impact, and surface geological conditions. Each tertiary indicator has a classification or quantitative data range. Based on the index system, a preliminary site selection range is determined. The selection of each classification and each quantitative data range is performed to determine the CO2 saline aquifer storage site.

[0008] Furthermore, the reservoir conditions include two secondary indicators: unit storage potential and storage area; the geological safety includes three secondary indicators: caprock thickness, fault distance, and borehole density; the energy development impact includes two secondary indicators: the impact of CO2 saline aquifer storage on mineral security development and the impact of mineral development on the leakage risk of CO2 saline aquifer storage; the surface geological conditions include four secondary indicators: ecological protection red line, urban development boundary, carbon source distance, and topographic complexity.

[0009] Furthermore, the impact of CO2 saline aquifer sequestration on the safe development of mineral resources includes three tertiary indicators: the relationship of the sequestration with the mineral resources, the nature of the mining rights, and the vertical distance from the mineral-bearing strata; the impact of mineral development on the leakage risk of CO2 saline aquifer sequestration includes two tertiary indicators: the change in the formation pressure field caused by mineral development and the thickness of the aquitard between the sequestration strata and the mineral-bearing strata.

[0010] Furthermore, the method also includes: conducting data collection and field surveys of the target area to obtain geological data such as geological maps, geophysical exploration, drilling, well logging, and testing data, as well as data on energy and mineral distribution, meteorology, hydrology, topography, transportation, and population distribution; and constructing a real-time map of the target area.

[0011] Furthermore, the step of initially determining the site selection range based on the indicator system includes: combining the actual situation map with the indicator system to initially determine the site selection range.

[0012] Furthermore, the aforementioned maps include: potential distribution maps, fault and abandoned borehole distribution maps, mineral distribution maps, ecological protection red line distribution maps, topographic and geomorphological maps, urban development boundary distribution maps, and important water systems and linear engineering distribution maps, etc.

[0013] Furthermore, reservoir condition analysis is conducted, including the reservoir-seal combination, main reservoir thickness, sedimentary facies, porosity, and permeability of the target area, and a potential distribution map is generated based on the CO2 geological sequestration potential evaluation method; geological safety analysis is conducted, identifying potential CO2 leakage channels such as abandoned wells and faults in the target area, and a distribution map of the faults and abandoned boreholes is generated; energy development impact analysis is conducted, identifying the distribution range of minerals such as coal, oil, and natural gas in the target area, and a mineral distribution map is generated; surface geological conditions are analyzed, and a distribution map of the ecological protection red line, the topographic map, the urban development boundary map, and the important water system and linear engineering project distribution map are generated.

[0014] Furthermore, the method for initially determining the site selection range based on the indicator system includes: forming a single-element layer from all the categories and all the quantitative data ranges, and performing a comprehensive analysis of the elements by overlaying them with the real-world map to initially determine the site selection range.

[0015] Furthermore, the step of selecting each of the categories and each of the quantitative data ranges includes: selecting each of the categories and each of the quantitative data ranges according to the needs of the energy and chemical industry base.

[0016] Furthermore, a human-computer interaction calculation method is used to select each of the categories and each of the quantitative data ranges to determine the CO2 saline aquifer storage site.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The method of this application establishes an index system for CO2 saline aquifer storage site selection based on the actual conditions of large-scale energy and chemical bases, and classifies or sets specific quantitative data ranges for each specific index. Therefore, CO2 saline aquifer storage site selection is based on data rather than subjective human judgment, making the site selection process objective and scientific, and enabling the determination of target areas that meet the actual needs of different energy and chemical bases. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. In the drawings:

[0020] Figure 1 This is a flowchart illustrating the site selection process for CO2 saline aquifer sequestration in an embodiment of this application.

[0021] Figure 2 This is the index system for CO2 saline aquifer sequestration site selection in the embodiments of this application. Detailed Implementation

[0022] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0023] In view of this, according to embodiments of this application, a method for site selection of CO2 saline aquifers for large-scale energy and chemical industry bases is provided, such as... Figure 1 , Figure 2 As shown, the method includes: establishing an index system for CO2 saline aquifer storage site selection, wherein the index system includes multiple primary indicators, each primary indicator includes multiple secondary indicators, and each secondary indicator includes one or more tertiary indicators. The primary indicators include: reservoir conditions, geological safety, energy development impact, and surface geological conditions. Each tertiary indicator has a classification or quantitative data range. Based on the index system, a preliminary site selection range is determined. Each classification and each quantitative data range is selected to determine the CO2 saline aquifer storage site.

[0024] Specifically, large-scale energy and chemical industrial bases, as special areas with concentrated carbon emission sources, face enormous pressure in terms of CO2 emission reduction. Simultaneously, the extraction of energy resources in these bases complicates the geological conditions, making the factors influencing CO2 saline aquifer site selection more complex. Therefore, to more comprehensively cover the factors affecting CO2 saline aquifer site selection, this application adds an energy development impact as a primary indicator to the indicator system, in addition to primary indicators applicable to ordinary areas such as reservoir conditions, geological safety, and surface geological conditions. Furthermore, for each tertiary indicator that can be quantified numerically, this application provides the quantitative data range; tertiary indicators that cannot be quantified numerically are categorized.

[0025] Furthermore, in one embodiment, such as Figure 2 As shown, the reservoir conditions include two secondary indicators: unit storage potential and storage area; the geological safety includes three secondary indicators: caprock thickness, fault distance, and borehole density; the impact of energy development includes two secondary indicators: the impact of CO2 saline aquifer storage on mineral security development and the impact of mineral development on the leakage risk of CO2 saline aquifer storage; the surface geological conditions include four secondary indicators: ecological protection red line, urban development boundary, carbon source distance, and topographic complexity.

[0026] Specifically, the unit storage potential includes a three-level indicator, the storage potential per unit area, representing the amount of CO2 that can be stored within a unit area; the storage area includes a three-level indicator, the target area, representing the required area of ​​the target area for CO2 saline aquifer storage to meet the needs of large-scale energy and chemical industry bases for CO2 storage; the caprock thickness includes a three-level indicator, the continuous mudstone thickness, requiring a sufficiently thick mudstone structure above the target area to achieve the goal of safe CO2 storage; the fault distance includes a three-level indicator, the distance from the fault location, requiring a sufficient distance between the target area and the geological fault location to achieve the goal of safe CO2 storage; and the borehole density includes a three-level indicator, the deep well density, representing the number of energy extraction wells within the target area, as excessive wells can negatively impact CO2 storage. The ecological protection red line includes three-level indicators for ecological protection areas. Target areas should meet national requirements for ecological protection and should be selected as far as possible outside of ecological protection zones. The urban development boundary includes the distance from the three-level indicators to the urban development boundary. Target areas should be far from urban development boundaries to ensure urban safety. The carbon source distance includes the distance from the three-level indicators to energy and chemical industry bases. The distance from the target area to the energy and chemical industry bases requiring CO2 emission reduction should consider not only the safety of CO2 sequestration but also factors such as transportation costs to the energy and chemical industry bases. The terrain complexity includes the three-level indicator of terrain undulation. The more complex the terrain above the target area, the more difficult it is to implement CO2 sequestration projects.

[0027] Furthermore, in one embodiment, such as Figure 2 As shown, the impact of CO2 saline aquifer sequestration on the safe development of mineral resources includes three tertiary indicators: the relationship of the sequestration with the mineral resources, the nature of the mining rights, and the vertical distance from the mineral-bearing strata; the impact of mineral development on the leakage risk of CO2 saline aquifer sequestration includes two tertiary indicators: the change in the formation pressure field caused by mineral development and the thickness of the aquitard between the sequestration strata and the mineral-bearing strata.

[0028] Specifically, the simpler the overburden relationship between the target area and various minerals, the more suitable it is as a site selection target for CO2 saline aquifer sequestration; when the mining rights have already been developed, an assessment can be made based on the existing mine conditions, while when the mining rights are still in the exploration phase, an assessment of possible development plans is necessary; the greater the vertical distance between the target area and the mineral-bearing strata, the less it will affect the smooth development of the minerals. The smaller the change in the formation pressure field caused by mineral development, the smaller the impact on the possibility of CO2 leakage; the greater the thickness of the aquitard between the mineral-bearing strata and the target area, the smaller the impact on the possibility of CO2 leakage.

[0029] In a specific embodiment, such as Figure 2As shown, this application provides specific data ranges for the following three-level indicators: storage potential per unit area, target area, continuous mudstone thickness, distance from the fault location, deep well density, vertical distance from the mineral-bearing stratum, changes in formation pressure field caused by mineral development, thickness of the aquitard between the mineral-bearing stratum and the mineral-bearing stratum, distance to the urban development boundary, distance to the energy and chemical industry base, and topographic relief. Furthermore, it provides the limit data for each indicator. Therefore, clear data support is provided during the final site selection process, ensuring objectivity. It should be noted that, as... Figure 2 The data range designed in the document is not a limitation on the scope of protection of this application; that is, the determination of the data range can be adjusted as needed.

[0030] Furthermore, in one embodiment, such as Figure 1 As shown, the method further includes: conducting data collection and field surveys of the target area to obtain geological data such as geological maps, geophysical exploration, drilling, well logging, and testing and analysis data, as well as data on energy and mineral distribution, meteorology, hydrology, topography, transportation, and population distribution of the target area; and constructing a real-time map of the target area.

[0031] Furthermore, in one embodiment, such as Figure 1 As shown, the step of initially determining the site selection range based on the indicator system includes: combining the actual situation map with the indicator system to initially determine the site selection range.

[0032] Specifically, the indicator system provides the criteria for site selection, but for a specific large-scale energy and chemical industry base, the specific target area must be determined based on the indicator system and the specific circumstances of the base itself.

[0033] Furthermore, in one embodiment, such as Figure 1 As shown, the actual situation maps include: potential distribution maps, fault and abandoned borehole distribution maps, mineral distribution maps, ecological protection red line distribution maps, topographic and geomorphological maps, urban development boundary distribution maps, and important water system and linear engineering distribution maps, etc.

[0034] Furthermore, in one embodiment, reservoir condition analysis is performed, including the reservoir-seal combination, main reservoir thickness, sedimentary facies, porosity, permeability, etc., of the target area, and a potential distribution map is formed based on the CO2 geological storage potential evaluation method; geological safety analysis is performed, identifying channels that may generate CO2 leakage, such as abandoned wells and faults in the target area, and a distribution map of the faults and abandoned boreholes is formed; energy development impact analysis is performed, identifying the distribution range of minerals such as coal, oil, and natural gas in the target area, and a mineral distribution map is formed; surface geological conditions are analyzed, and a distribution map of the ecological protection red line, the topographic map, the urban development boundary map, and the distribution map of important water systems and linear engineering projects are formed, etc.

[0035] Specifically, constructing the real-world map allows for a clearer and more intuitive understanding of the specific distribution of target areas within the target region that conform to the various indicators in the indicator system.

[0036] Furthermore, in one embodiment, such as Figure 1 As shown, the method for initially determining the site selection range based on the indicator system includes: forming a single-element layer from all the categories and all the quantitative data ranges, and performing a comprehensive analysis of the elements by overlaying them with the real-world map to initially determine the site selection range.

[0037] Specifically, the data of each indicator in the aforementioned indicator system are formed into a single-element layer. Then, spatial analysis software such as GIS is used to overlay the single-element layer with the actual map for comprehensive element analysis, and the union is calculated to preliminarily determine the CO2 saline aquifer storage site. This analysis process completely avoids human interference and can completely and without omission identify each preset target area and the classification or quantitative data range of each indicator in each preset target area.

[0038] Furthermore, in one embodiment, such as Figure 1 As shown, the step of selecting each category and each quantitative data range includes: selecting each category and each quantitative data range according to the needs of the energy and chemical industry base.

[0039] Furthermore, in one embodiment, such as Figure 1 As shown, a human-computer interactive calculation method is used to select each category and each quantitative data range to determine the CO2 saline aquifer storage site.

[0040] Specifically, different energy and chemical industry bases will inevitably have different subjective needs for CO2 saline aquifer sequestration sites based on factors such as mineral properties, geological environment, geographical environment, and cost budget. Therefore, this application, in conjunction with GIS spatial analysis results and based on the actual needs of the energy and chemical industry bases, first classifies various indicators according to their importance, then selects the classification or quantitative data range of each indicator in the indicator system, and uses a human-computer interaction method to adjust each indicator within the data range. Finally, it determines CO2 saline aquifer sequestration sites that meet the needs of the energy and chemical industry bases from multiple preset target areas. It should be noted that, in combining GIS spatial analysis results with the actual needs of the energy and chemical industry bases, methods that can achieve the site selection objective are all within the scope of protection of this application, such as the layer-by-layer approximation method.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for site selection of CO2 saline aquifers for storage in large-scale energy and chemical industrial bases, characterized in that, The method includes: An indicator system for CO2 saline aquifer storage site selection is established. The indicator system includes multiple primary indicators, each of which includes multiple secondary indicators, and each of which includes one or more tertiary indicators. The primary indicators include: reservoir conditions, geological safety, energy development impact, and surface geological conditions. Each tertiary indicator has a classification or quantitative data range. Based on the aforementioned indicator system, the preliminary site selection area has been determined; By selecting each of the aforementioned categories and each of the aforementioned quantitative data ranges, the CO2 saline aquifer storage site is determined.

2. The method according to claim 1, characterized in that, The storage conditions include two secondary indicators: unit storage potential and storage area; The geological safety includes three secondary indicators: caprock thickness, fracture distance, and borehole density. The impact of energy development includes two secondary indicators: the impact of CO2 saline aquifer sequestration on mineral security development and the impact of mineral development on the leakage risk of CO2 saline aquifer sequestration. The ground geological conditions include four secondary indicators: ecological protection red line, urban development boundary, carbon source distance, and terrain complexity.

3. The method according to claim 2, characterized in that, The impact of CO2 saline aquifer sequestration on the safe development of mineral resources includes three tertiary indicators: the relationship with mineral resources, the nature of the mining rights, and the vertical distance from the mineral-bearing strata. The impact of mineral development on the leakage risk of CO2 saline aquifer sequestration includes two tertiary indicators: changes in the formation pressure field caused by mineral development and the thickness of the aquitard between the mineral-bearing layer and the formation pressure field.

4. The method according to claim 1, characterized in that, The method further includes: Data collection and field surveys were conducted in the target area to obtain geological data such as geological maps, geophysical exploration, drilling, well logging, and testing, as well as data on the distribution of energy and mineral resources, meteorology, hydrology, topography, transportation, and population distribution. Construct a real-world map of the target area.

5. The method according to claim 4, characterized in that, The step of initially determining the site selection range based on the indicator system includes: combining the actual situation map with the indicator system to initially determine the site selection range.

6. The method according to claim 4, characterized in that, The actual maps include: potential distribution maps, fault and abandoned borehole distribution maps, mineral distribution maps, ecological protection red line distribution maps, topographic and geomorphological maps, urban development boundary distribution maps, and important water systems and linear engineering distribution maps, etc.

7. The method according to claim 6, characterized in that, A reservoir condition analysis is conducted, including the reservoir-seal combination, main reservoir thickness, sedimentary facies, porosity, and permeability of the target area, and a potential distribution map is generated based on the CO2 geological storage potential evaluation method. A geological safety analysis was conducted to identify potential CO2 leakage pathways, such as abandoned wells and fractures in the target area, and a distribution map of the fractures and abandoned boreholes was generated. Conduct an energy development impact analysis, identify the distribution range of minerals such as coal, oil, and natural gas in the target area, and generate a mineral distribution map; Surface geological conditions are analyzed, and the distribution maps of the ecological protection red lines, topography, urban development boundaries, and important water systems and linear engineering projects are generated.

8. The method according to claim 5, characterized in that, The method for initially determining the site selection range based on the indicator system includes: forming a single-element layer from all the categories and all the quantitative data ranges, and performing a comprehensive analysis of the elements by overlaying them with the real-world map to initially determine the site selection range.

9. The method according to claim 1, characterized in that, The step of selecting each of the categories and each of the quantitative data ranges includes: selecting each of the categories and each of the quantitative data ranges according to the needs of the energy and chemical industry base.

10. The method according to claim 9, characterized in that, A human-computer interactive calculation method is used to select each category and each range of quantified data to determine the CO2 saline aquifer storage site.

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