A compressed air energy storage site selection evaluation method based on multi-source data analysis

Abstract

This invention discloses a method for site selection evaluation of compressed air energy storage based on multi-source data analysis, belonging to the field of site selection evaluation technology. The method includes: extracting connectivity evidence connected to candidate gas storage caverns based on a minimum closed chain of evidence; converting continuously connected evidence into leakage channel nodes and node connections; blocking conduction interrupted by intact surrounding rock and low-permeability barriers to obtain an underground leakage channel connectivity map; performing path tracing on the underground leakage channel connectivity map; identifying blocking markers in the paths; stopping the extension of paths terminated due to blocking and excluding these paths; and locking high-risk paths that can continuously connect from the candidate gas storage cavern to the external leakage boundary to obtain a risk chain for candidate site selection. This invention improves the stability of candidate gas storage cavern access judgment and the accuracy of sealing risk identification.

Description

Technical Field

[0001] This invention relates to the field of site selection evaluation technology, and in particular to a method for site selection evaluation of compressed air energy storage based on multi-source data analysis. Background Technology

[0002] Compressed air energy storage, as an important direction in large-scale energy storage technology, typically relies on underground caverns, salt caverns, abandoned mines, or artificial chambers to form high-pressure air storage spaces. With the expansion of new energy grid connection, the demand for compressed air energy storage power plants is constantly increasing. The site selection evaluation of gas storage caverns has gradually evolved from judging solely on geological conditions to a comprehensive evaluation combining geological exploration, hydrogeology, surrounding rock integrity, permeability testing, underground engineering data, and supporting construction conditions. Current site selection evaluations usually require a comprehensive analysis of the burial depth, surrounding rock pressure bearing capacity, airtightness, and external supporting conditions of candidate gas storage caverns, and utilize multi-source data analysis, spatial mapping, and risk identification methods to assist in forming site selection conclusions.

[0003] While existing compressed air energy storage site selection evaluation technologies can assess the basic geological conditions and engineering support conditions of candidate gas storage caverns, multi-source data often come from different spatial benchmarks and different survey objects. This can easily lead to unclear correspondence between the evidence content and the candidate gas storage caverns, resulting in a lack of continuous and closed evidence chain to support the admission judgment of candidate gas storage caverns. At the same time, for the conductivity content that may form leakage paths, such as fissures, faults, fracture zones, and permeable layers, existing evaluations mostly remain at the level of single-point risk identification or empirical judgment, making it difficult to combine evidence of continuous distribution of intact surrounding rock, evidence of low permeability barrier conditions, and the connection relationship of leakage paths, resulting in unstable results in the sealing risk assessment. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a compressed air energy storage site selection evaluation method based on multi-source data analysis to solve the problems of insufficient evidence chain closure for candidate gas storage chambers and inaccurate identification of risks associated with underground leakage channels.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a method for site selection evaluation of compressed air energy storage based on multi-source data analysis. The method includes: object-fitting and trimming of access data around the location of candidate gas storage chambers, extracting only valid content that points to the gas storage conditions of the candidate chambers and excluding background content that does not correspond to the candidate chambers, thus obtaining candidate object evidence fragments; mapping these fragments to the same spatial reference, performing connection verification and progressive closure to form an access closure path, and locking the closure of the access closure path to obtain a minimum closed evidence chain; and extracting continuity evidence connected to the candidate chambers based on the minimum closed evidence chain, transforming continuously received continuity evidence into leakage channel nodes. The process involves connecting nodes and blocking the flow paths interrupted by intact surrounding rock and low-permeability barriers to obtain a network map of underground leakage channels. Path tracing is performed on this network map, identifying blocking markers along the paths. Paths terminated due to blocking are stopped and excluded. Paths that can be continuously connected from candidate gas storage chambers to the external leakage boundary are identified as high-risk, resulting in a risk chain for candidate site selection. Based on the risk chain and the minimum closure evidence chain, unclosed links are located and supplementary evidence objects are generated. External leakage risk assessment is then performed to form risk assessment objects. Candidate objects that do not trigger external leakage risk assessment are ranked according to matching conditions to generate site selection evaluation results.

[0007] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the specific steps of object fitting and trimming of the access data are as follows: The access data is spatially correlated with the locations of candidate gas storage caverns, and the access data is excluded from the object selection by using the influence range of the candidate gas storage caverns as the clipping boundary, thus obtaining the cavern location set. The effective data content of the cavern location set is obtained. Taking the location of the candidate gas storage cavern as the object benchmark, the content that falls within the influence range of the candidate gas storage cavern is extracted from the effective data content. The content that cannot point to the gas storage conditions of the candidate gas storage cavern is eliminated according to the burial depth conditions, surrounding rock pressure conditions and sealing and blocking conditions, so as to obtain the matching content set.

[0008] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the step of obtaining the candidate object evidence fragment is as follows: Based on the influence range of the candidate gas storage cavern, the gas storage conditions of the candidate gas storage cavern, and the connection relationship of the access chain, the cavern correspondence of the attached content is verified. The attached content that corresponds to the location, has clear conditions and can be connected to the access closure path is retained as gas storage evidence content. The attached content that has location deviation, only describes the background, and cannot participate in any of the access closure situations is separated into background content, thus obtaining the gas storage evidence set. Each candidate gas storage cavern location is treated as a candidate site selection object. The gas storage evidence set is objectified and encapsulated to obtain candidate object evidence fragments.

[0009] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the formation of the access closed path is specifically as follows: The candidate object evidence fragments are mapped to the same spatial reference according to the location of the candidate gas storage cavern to form a unified spatial landing point, and the candidate object evidence fragments that cannot fall into the same spatial reference are removed from the access processing range to obtain a spatial mapping set. Based on the engineering conditions of the candidate gas storage caverns, the evidence fragments of the candidate objects in the spatial mapping set are arranged into an admission chain position to obtain an admission sequence. The admission sequence is verified segment by segment according to the evidence fragments of adjacent candidate objects. When adjacent fragments can be connected continuously and are connected according to the admission chain position, they are retained. When there is a spatial break, chain position inversion or missing condition, the breakpoint is locked to obtain the verification sequence. Based on the verification sequence, the evidence fragments of candidate objects are connected to the admission closed path according to the progressive relationship of the admission conditions. The evidence fragments of candidate objects that do not correspond to the location of the candidate gas storage cavern or cannot be connected in the progressive relationship of the admission conditions are excluded, thus obtaining the admission closed path.

[0010] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the process of obtaining the minimum closed chain of evidence is as follows: The evidence segments are examined one by one along the closed access path. The evidence segments that are continuously connected in sequence according to the burial depth, surrounding rock pressure and airtightness, starting from the location of the candidate gas storage cavern and not locked by the breakpoint are fixed into a chain structure to obtain the access evidence chain. The access evidence chain is screened according to the sequential relationship of the access closure path. Duplicate content, content that deviates from the continuous path, and content that is locked at breakpoints are eliminated. Continuous evidence that can be connected sequentially and complete the access closure is retained to obtain the minimum closed evidence chain.

[0011] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the step of converting continuously received continuity evidence into leakage channel nodes and node connections is as follows: Based on the minimum closed chain of evidence, the candidate gas storage cavern is used as the starting point of the connection. The connection content connected to the candidate gas storage cavern is attached to the position of the candidate gas storage cavern, and the leakage direction is written according to the direction of the connection content extending from the candidate gas storage cavern to the external leakage boundary, so as to obtain the connection evidence set. Based on the continuity evidence set, the leakage direction is pre-formed into a chain according to the sequential order of the smallest closed evidence chain. The continuously extending continuity evidence is transformed into leakage channel nodes and node connections. Continuation breakpoints are set at the interruption of the continuity direction and the jump of the continuity object to obtain the node connection set.

[0012] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the method for obtaining the underground leakage channel connectivity diagram is as follows: Based on the node connection set, the evidence content in the minimum closed evidence chain is mapped to the node connection. Node connections interrupted by evidence of continuous distribution of intact surrounding rock and evidence of low permeability barrier conditions are marked with blocking treatment, and traceable connection nodes are retained to obtain the blocked connection set. Based on the blocked connection set, starting with the candidate gas storage cavern, the node connections are verified along the leakage direction. Nodes that have not been marked with blocked treatment and can be continuously connected are encapsulated as traceable channels. Nodes that have been marked with blocked treatment and are blocked by evidence of continuous distribution of intact surrounding rock and evidence of low permeability barrier conditions are encapsulated as blocked channels, thus obtaining the underground leakage channel connectivity map.

[0013] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the step of stopping the extension of paths terminated due to blockage and eliminating those paths specifically includes the following: Obtain the node connections in the underground leakage channel connectivity diagram, write the leakage direction starting from the candidate gas storage chamber, connect the nodes with the same direction and continuous connection into a candidate tracking path, and complete the labeling according to three types of status: trackable, blocked and to be stopped, and abnormal and to be eliminated, and generate a candidate tracking path diagram. Identify blocking markers in the candidate tracing path graph, and perform path interception at the node connection where the blocking marker is located to stop the path extension after the blocking position. At the same time, fix the interception position and the path segment before the interception to obtain the intercepted path segment. The blocked and terminated paths in the intercepted path segment are excluded, and the continuity of adjacent nodes in the unblocked extension path and the consistency of the path extension direction pointing to the external leakage boundary are verified. Unblocked extension paths with continuous nodes and consistent leakage direction are selected as candidate paths for connection.

[0014] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the risk chain of candidate site selection objects is obtained as follows: Based on the candidate through-path, the external leakage boundary is verified. When the candidate through-path starts from the candidate gas storage cavern, extends continuously along the nodes that have not been marked with the blocking treatment, and reaches the external leakage boundary of the gas storage closed system, the corresponding candidate through-path is marked as a high-risk locked path. According to the candidate site selection objects, high-risk locking routes with the same starting point corresponding to the same candidate gas storage cavern location are classified under the same candidate site selection object, and connected in series according to the leakage direction and the path connection order to obtain the risk chain of the candidate site selection objects.

[0015] As a preferred embodiment of the compressed air energy storage site selection evaluation method based on multi-source data analysis described in this invention, the generation of site selection evaluation results is specifically as follows: Based on the candidate site selection objects, the risk chains and minimum closed evidence chains of the candidate site selection objects are aligned, and they are assigned to the initial positions of evidence to be verified, risk to be adjudicated, and sorting to be processed, thus obtaining a chain evidence comparison table. Based on the chain evidence comparison table, the missing, broken, and unconnectable positions in the access closure path are found, and supplementary evidence pointers are generated. Candidate objects with the above positions are written to the supplementary evidence status, indicating the evidence content that needs to be supplemented. The candidate objects are marked as supplementary evidence objects, and the candidate location objects with closed evidence chains are transferred to the leakage risk judgment position to obtain the supplementary evidence processing table. Retrieve candidate site selection objects to be adjudicated from the supplementary certificate processing table, mark the candidate objects with leakage and connection risks as risk adjudication objects, and transfer the candidate site selection objects that have not triggered leakage risk adjudication to the supporting conditions sorting position to obtain the adjudication processing table. Based on the adjudication processing table, retrieve the corresponding conditions for candidate site selection objects that have not triggered the risk of leakage adjudication, and perform priority sorting to obtain the corresponding sorting table. Based on the matching sorting table, the supplementary certification objects, risk adjudication objects, and candidate site selection objects that have completed the site selection priority sorting process are respectively written into the supplementary certification status, risk adjudication status, and preferred sorting status, and the site selection evaluation results are generated according to the hierarchy.

[0016] The beneficial effects of this invention are as follows: by mapping, verifying and progressively closing the evidence fragments of candidate objects, a minimum closed evidence chain is formed to exclude background evidence and breakpoint evidence, thereby improving the stability of the admission judgment of candidate gas storage caverns; by transforming the conduction evidence, blocking the processing and tracing the path, a connection map of underground leakage channels and a risk chain of candidate site selection objects are formed for the judgment of leakage risks, thereby improving the accuracy of the identification of closed risks. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a compressed air energy storage site selection evaluation method based on multi-source data analysis.

[0019] Figure 2 A flowchart for generating evidence fragments for candidate objects.

[0020] Figure 3 A flowchart for generating the minimum closed chain of evidence.

[0021] Figure 4 A flowchart generated from the site selection evaluation results. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Reference Figures 1-4 This is one embodiment of the present invention, which provides a method for evaluating the site selection of compressed air energy storage based on multi-source data analysis, including the following steps: S1: Based on the location of the candidate gas storage cavern, the access data is subject to object fitting and cropping. Only the valid content that can point to the gas storage conditions of the candidate gas storage cavern is extracted, and the background content that cannot form a corresponding relationship with the candidate gas storage cavern is excluded to obtain candidate object evidence fragments. S1.1: Spatial correspondence between the access data and the candidate gas storage cavern locations, and object exclusion of the access data using the influence range of the candidate gas storage caverns as the clipping boundary to obtain the cavern location set; Access data refers to multi-source data related to the assessment of gas storage conditions of candidate gas storage caverns. Access data includes at least one of the following: geological survey data, hydrogeological data, topographic mapping data, fault and fracture data, surrounding rock integrity data, permeability test data, underground engineering data, and candidate gas storage cavern design data.

[0026] Furthermore, the access data is standardized according to the data coordinates, data coverage, and data formation location. Geological exploration data, hydrogeological data, and surrounding rock integrity data are projected onto the spatial reference where the candidate gas storage cavern is located. The positional deviation between the spatial landing point of the access data and the location of the candidate gas storage cavern is calculated. The access data is then assigned a corresponding number based on the location of the candidate gas storage cavern, forming a spatial correspondence between the access data and the location of the candidate gas storage cavern.

[0027] The influence range of the candidate gas storage cavern is used as the trimming boundary. The access data that forms the spatial landing point correspondence is verified by range verification. Access data that exceeds the trimming boundary, access data that cannot correspond to the location of the candidate gas storage cavern, and access data that cannot point to the gas storage conditions of the candidate gas storage cavern are excluded. The retained access data are collected according to the location of the candidate gas storage cavern to obtain the cavern location set.

[0028] It should be noted that the influence range of the candidate gas storage cavern is determined based on the outer contour of the candidate gas storage cavern, the influence range of the design working pressure, the disturbance range of the surrounding rock, and the identification range of the leakage channel. When the influence range of the design working pressure cannot be obtained, a cutoff boundary is formed by extending the outer contour of the candidate gas storage cavern outward by a preset distance. The preset distance is determined based on the design working pressure, the radius of the surrounding rock disturbance, the width of the fault structure influence zone, and the influence range in the exploration specifications. The cutoff boundary is then bound to the location of the candidate gas storage cavern for the scope verification of the access data.

[0029] S1.2: Obtain the effective data content in the cavern location set. Taking the location of the candidate gas storage cavern as the object benchmark, extract the content in the effective data content that falls within the influence range of the candidate gas storage cavern. Then, according to the burial depth conditions, surrounding rock pressure conditions and airtight isolation conditions, remove the content that cannot point to the gas storage conditions of the candidate gas storage cavern to obtain the matching content set. The gas storage conditions of a candidate gas storage cavern refer to the burial depth, surrounding rock pressure conditions, airtight enclosure conditions, and leakage risk constraints that a candidate gas storage cavern must meet when used for compressed air energy storage.

[0030] Furthermore, the cavern location set is checked against the access data content one by one according to the location of the candidate gas storage caverns. The location range, burial depth description, surrounding rock description, and barrier description in the data content are respectively matched with the location of the candidate gas storage caverns. Content that falls within the influence range of the candidate gas storage caverns and can explain the feasibility of gas storage is retained, while content that only describes the regional topography, is far from the location of the candidate gas storage caverns, or does not reflect the burial depth, surrounding rock pressure, and airtight barrier of the candidate gas storage caverns is removed. The retained content is written into the corresponding candidate gas storage cavern location to obtain the effective data content.

[0031] The effective data content is trimmed item by item based on the gas storage conditions of the candidate gas storage caverns. The content of burial depth, surrounding rock pressure and sealing barrier under the same candidate gas storage cavern location is compared with each other. The content that can jointly support the judgment of the gas storage conditions of the candidate gas storage caverns is retained, and the content that is inconsistent in location, only describes the background situation or cannot participate in the subsequent verification is deleted. The data is then collected according to the location of the candidate gas storage caverns to obtain a set of relevant content.

[0032] S1.3: Based on the influence range of the candidate gas storage cavern, the gas storage conditions of the candidate gas storage cavern, and the connection relationship of the access chain, the cavern correspondence of the attached content is verified. The attached content that corresponds in position, has clear conditions and can be connected to the access closure path is retained as gas storage evidence content. The attached content that has positional deviation, only describes the background, and cannot participate in any of the access closure situations is separated into background content, thus obtaining the gas storage evidence set. Furthermore, the content set is verified item by item according to the location of the candidate gas storage cavern. The location, burial depth, surrounding rock strata, and sealing barrier location of each item are compared with the location of the candidate gas storage cavern. Content whose location falls within the influence range of the candidate gas storage cavern, corresponds to the burial depth, surrounding rock pressure conditions, and sealing barrier conditions, and can be connected to the access closure path along the access chain position is retained as gas storage evidence content.

[0033] Content that is out of place, only describes the regional geological overview, the situation of adjacent caverns, the distribution of distant structures, cannot support the judgment of the gas storage conditions of candidate gas storage caverns, or cannot be connected to any of the access closure paths, is separated into background content; the gas storage evidence content is collected according to the location of candidate gas storage caverns, and the correspondence between the gas storage evidence content and the gas storage conditions of candidate gas storage caverns is retained to obtain the gas storage evidence set.

[0034] It should be noted that the correspondence between the reserved content and the gas storage conditions of the candidate gas storage cavern is to indicate that each reserved content is specifically used to determine the burial depth conditions, surrounding rock pressure conditions, or airtight enclosure conditions.

[0035] S1.4: Using each candidate gas storage cavern location as a candidate site selection object, the gas storage evidence set is objectified and encapsulated to obtain candidate object evidence fragments.

[0036] Furthermore, each candidate gas storage cavern location is treated as a candidate site selection object. The contents of the gas storage evidence set containing the same candidate gas storage cavern location are classified under the same candidate site selection object. The content of each gas storage evidence is checked to see if it corresponds to the burial depth conditions, surrounding rock pressure conditions, or sealing and isolation conditions of the candidate site selection object. The gas storage evidence content that can be classified into the candidate site selection object is written with the candidate gas storage cavern location and condition type, so that the gas storage evidence content under the same candidate site selection object has a clear location and condition classification.

[0037] The gas storage evidence set is packaged according to the candidate site selection objects. The gas storage evidence content, candidate gas storage cavern location, burial depth conditions, surrounding rock pressure conditions, and sealing and isolation conditions under the same candidate site selection object are fixed in the same evidence fragment. Content that cannot be attributed to any candidate site selection object, has inconsistent location, or unclear conditions is removed. This ensures that each evidence fragment corresponds to only one candidate site selection object and can be used for subsequent verification and progressive closure to obtain candidate object evidence fragments.

[0038] It should be noted that unclear attribution of conditions means that the gas storage evidence cannot be clearly attributed to a specific category among burial depth conditions, surrounding rock pressure conditions, or airtight enclosure conditions.

[0039] S2: Map the candidate object evidence fragments to the same spatial reference, perform connection verification and progressive closure to form an admission closure path, and lock the admission closure path to obtain the minimum closed evidence chain; S2.1: Map the candidate object evidence fragments to the same spatial reference according to the location of the candidate gas storage cavern, forming a unified spatial landing point, and remove the candidate object evidence fragments that cannot fall into the same spatial reference from the access processing range to obtain a spatial mapping set; Furthermore, the candidate object evidence fragments are checked item by item according to the location of the candidate gas storage cavern. The location orientation, data coverage and gas storage conditions in the candidate object evidence fragments are projected onto the same spatial reference. Different coordinate expressions, different map sources and different burial depth expressions are unified to the spatial location corresponding to the candidate gas storage cavern location. Candidate object evidence fragments that can correspond to the same candidate gas storage cavern location are fixed to the same spatial landing point to form a unified spatial landing point.

[0040] Candidate object evidence fragments that cannot fall into the same spatial reference are removed from the admission processing scope individually, including those that lack the location indication of the candidate gas storage cavern, cannot convert coordinate expressions, have data coverage that does not coincide with the location of the candidate gas storage cavern, or have contradictory location indications within the same candidate object evidence fragment; candidate object evidence fragments that can stably fall into a unified spatial landing point and correspond to the location of the candidate gas storage cavern are retained and grouped according to the location of the candidate gas storage cavern to obtain a spatial mapping set.

[0041] It should be noted that grouping according to the location of candidate gas storage caverns means putting evidence fragments of candidate objects that point to the same candidate gas storage cavern location into the same group and binding them to the corresponding candidate gas storage cavern location.

[0042] S2.2: Based on the engineering conditions of the candidate gas storage caverns, the evidence fragments of the candidate objects in the spatial mapping set are arranged into an admission chain position to obtain an admission sequence; Furthermore, the engineering conditions of the candidate gas storage caverns are determined sequentially according to the location, burial depth, surrounding rock pressure conditions, and sealing and enclosure conditions of the candidate gas storage caverns. The evidence fragments of the candidate objects in the spatial mapping set are grouped according to the corresponding locations of the candidate gas storage caverns. The evidence fragments in each group that can prove the same candidate gas storage cavern are placed in the corresponding engineering condition positions, so that the location evidence is at the beginning of the chain, the burial depth evidence follows the location evidence, the surrounding rock pressure evidence follows the burial depth evidence, and the sealing and enclosure evidence follows the surrounding rock pressure evidence.

[0043] The candidate object evidence fragments in the spatial mapping set are arranged in a chain according to the order of engineering conditions. Candidate object evidence fragments with continuous condition order and consistent position are linked together. Candidate object evidence fragments that lack prerequisite conditions, cross engineering conditions, or are inconsistent with the position of the same candidate gas storage chamber are excluded from the continuous chain position. This transforms the candidate object evidence fragments from a scattered state into a chain arrangement that can reflect the order of admission judgment, thus obtaining the admission sequence.

[0044] S2.3: The admission sequence is verified segment by segment according to the evidence fragments of adjacent candidate objects. When adjacent fragments can be connected continuously and are connected according to the admission chain position, they are retained. When there is a spatial break, chain position inversion, or missing condition, the breakpoint is locked to obtain the verification sequence. Furthermore, the admission sequence selects adjacent candidate object evidence fragments segment by segment according to the location of the candidate gas storage cavern. The spatial range and admission chain position of the previous candidate object evidence fragment are compared with the spatial range and admission chain position of the next candidate object evidence fragment. When adjacent candidate object evidence fragments point to the same candidate gas storage cavern location, the spatial ranges can be continuously connected, and the admission chain positions can be connected according to the candidate gas storage cavern location, burial depth conditions, surrounding rock pressure conditions, and sealing and blocking conditions, the adjacent candidate object evidence fragments are retained as continuous evidence fragments.

[0045] When any of the following situations occur: spatial range break, inversion of the admission chain position, or missing admission conditions, the corresponding candidate object evidence fragment is locked at the breakpoint, and the breakpoint position, the evidence fragment before the breakpoint, and the evidence fragment after the breakpoint are fixed; continuous evidence fragments are retained according to the admission chain position, and the candidate object evidence fragment after the breakpoint is locked does not participate in the continuous closure, thus obtaining the verification sequence.

[0046] S2.4: Based on the verification sequence, the candidate object evidence fragments are connected to the admission closed path according to the progressive relationship of the admission conditions. Candidate object evidence fragments that do not correspond to the location of the candidate gas storage cavern or cannot be connected along the progressive relationship of the admission conditions are excluded to obtain the admission closed path. Furthermore, the verification sequence is expanded item by item according to the location of the candidate gas storage cavern. Each candidate object evidence fragment is checked to see if it points to the same candidate gas storage cavern location, whether the burial depth content follows the location content, whether the surrounding rock pressure content follows the burial depth content, and whether the sealing and partition content follows the surrounding rock pressure content. If a candidate object evidence fragment is encountered with a breakpoint lock mark, location jump, missing condition, or reversed sequence, it is directly removed from the continuous link.

[0047] The retained candidate evidence fragments are joined together according to their sequential relationship. The content of the candidate gas storage cavern location is used as the starting point for closure, and the content of burial depth is connected. Then, the content of surrounding rock pressure and sealing barrier is connected. It is also checked whether adjacent content belongs to the same candidate gas storage cavern location. Candidate evidence fragments with consistent location, continuous conditions and no broken evidence are fixed into a continuous path to obtain the admission closure path.

[0048] It should be noted that the progressive relationship of the admission conditions is the successive relationship between the candidate gas storage cavern location, burial depth condition, surrounding rock pressure condition, and sealing and enclosure condition. Among them, the candidate gas storage cavern location limits the scope of evidence attribution, the burial depth condition follows the candidate gas storage cavern location, the surrounding rock pressure condition follows the burial depth condition, and the sealing and enclosure condition follows the surrounding rock pressure condition.

[0049] S2.5: Examine the evidence segments one by one along the access closure path, and fix the evidence segments that are continuously connected in sequence according to the burial depth, surrounding rock pressure conditions and airtight isolation conditions, starting from the location of the candidate gas storage cavern, and not locked by the breakpoint into a chain structure to obtain the access evidence chain. Furthermore, the access closure path is unfolded one by one according to the location of the candidate gas storage cavern. Taking the location of the candidate gas storage cavern as the starting point of the chain, the evidence fragments corresponding to the burial depth condition, the surrounding rock pressure condition, and the airtight enclosure condition are verified in sequence. When the location of the evidence fragment is consistent with the location of the candidate gas storage cavern, the preceding and following conditions can be continuously connected according to the access closure path, and there are no breakpoint locking marks, it is included in the fixed range of the access evidence chain.

[0050] Furthermore, the access closure path is unfolded one by one according to the location of the candidate gas storage cavern. Taking the location of the candidate gas storage cavern as the starting point of the chain, the evidence fragments corresponding to the burial depth condition, the surrounding rock pressure condition, and the airtight enclosure condition are verified in sequence. When the location of the evidence fragment is consistent with the location of the candidate gas storage cavern, the preceding and following conditions can be continuously connected according to the access closure path, and there are no breakpoint locking marks, it is included in the fixed range of the access evidence chain.

[0051] S2.6: Screen the access evidence chain according to the sequential relationship of the access closure path, remove duplicate content, content that deviates from the continuous path and content that is locked at breakpoints, and retain continuous evidence that can be connected sequentially and complete the access closure to obtain the minimum closed evidence chain.

[0052] Furthermore, the access evidence chain is screened one by one according to the location of the candidate gas storage cavern. Evidence that points to the same candidate gas storage cavern location, corresponds to the same gas storage conditions, and has the same judgment conclusion is treated as duplicate content. Among the duplicate content, evidence that has a clearer location, more complete evidence expression, and can be directly connected to the access closure path is retained, and the remaining duplicate content is removed from the access evidence chain.

[0053] Following the sequential order of candidate gas storage cavern location, burial depth, surrounding rock pressure conditions, and airtight enclosure conditions, continue to verify the correspondence between the evidence content and the continuous path; evidence content that cannot be connected to the admission closed path in the above order, only describes auxiliary background, or cannot support the admission judgment of candidate gas storage caverns is eliminated as content that deviates from the continuous path.

[0054] Evidence with breakpoint locking marks is removed from the access evidence chain according to the breakpoint position, while retaining the continuous evidence that has been verified before and after the breakpoint; the retained continuous evidence is reconnected according to the connection relationship of the access closure path, so that the candidate gas storage cavern location, burial depth conditions, surrounding rock pressure conditions and sealing conditions remain continuous and closed, and are fixed as a chain structure corresponding to the same candidate site, thus obtaining the minimum closed evidence chain.

[0055] S3: Based on the minimum closed chain of evidence, extract the conduction evidence connected to the candidate gas storage chamber, transform the continuously received conduction evidence into leakage channel nodes and node connections, and block the conduction content interrupted by intact surrounding rock and low-permeability isolation conditions to obtain the underground leakage channel connectivity diagram. S3.1: Based on the minimum closed chain of evidence, with the candidate gas storage cavern as the starting point of the connection, the connection content connected to the candidate gas storage cavern is attached to the position of the candidate gas storage cavern, and the leakage direction is written according to the direction of the connection content extending from the candidate gas storage cavern to the external leakage boundary, so as to obtain the connection evidence set. Furthermore, the minimum closed chain of evidence searches for the connecting content according to the location of the candidate gas storage cavern, extracts the content of fractures, faults, fracture zones and permeable layers that are adjacent to or intersect with the candidate gas storage cavern, and marks the candidate gas storage cavern as the starting point of the connection; each connecting content establishes a starting point connection relationship with the location of the candidate gas storage cavern, and content that cannot be connected to the candidate gas storage cavern is not included in the connection range.

[0056] The conductive content is sorted out along the direction from the candidate gas storage cavern to the external leakage boundary. The conductive content that can extend outward from the candidate gas storage cavern is written into the leakage direction. The content with unclear conductive direction, only describing the sealing conditions, or not pointing to the external leakage boundary is excluded. The conductive content that has completed the starting point connection and has the leakage direction is retained and collected according to the location of the candidate gas storage cavern to obtain the conductive evidence set.

[0057] It should be noted that the direction of leakage refers to the direction in which the leakage content extends from the candidate gas storage cavity along fissures, faults, fracture zones, or permeable layers towards the external leakage boundary of the gas storage closed system.

[0058] S3.2: Based on the conduction evidence set, the leakage direction pre-chain processing is carried out according to the sequential order of the minimum closed evidence chain. The continuously extending conduction evidence is transformed into leakage channel nodes and node connections. At the interruption of the conduction direction and the jump of the conduction object, the continuation breakpoint is set to obtain the node connection set. Furthermore, the connection evidence set is sorted out one by one according to the location of the candidate gas storage cavern. The connection evidence close to the candidate gas storage cavern is placed at the starting position, and then the contents of the fracture, fault, fracture zone or permeable layer that can continue to extend outward are searched along the leakage direction. When the adjacent contents can be connected in terms of location, direction and connection object, the adjacent contents are connected, and each connectable content is converted into leakage channel node and node connection.

[0059] Continue checking along the already connected content. When encountering a sudden change in the direction of the connection, a break in the spatial position, an inability of the preceding and following content to connect with each other, or a connection object jumping from one object to another that cannot be connected, set a breakpoint at the break point; retain the connected content that can be continuously extended outward, and remove the content that cannot be connected to obtain the node connection set.

[0060] S3.3: Based on the node connection set, match the evidence content in the minimum closed evidence chain with the node connection, write the blocking processing mark for the node connection that is interrupted by the evidence of continuous distribution of intact surrounding rock and the evidence of low permeability barrier conditions, and retain the traceable connection nodes to obtain the blocked connection set; Furthermore, the node connection set is checked segment by segment according to the location of the candidate gas storage cavern. The starting point, ending point, and leakage direction of each node connection are matched with the evidence content in the minimum closed evidence chain. It is checked whether the two ends of the node connection fall within the same candidate gas storage cavern location range, and whether there is evidence of continuous distribution of intact surrounding rock or evidence of low-permeability barrier conditions in the extension direction of the node connection. When the evidence of continuous distribution of intact surrounding rock crosses the extension direction of the node connection, or the evidence of low-permeability barrier conditions is located at the necessary path for the node connection to continue leakage, the coverage length of the evidence of continuous distribution of intact surrounding rock, the coverage length of the evidence of low-permeability barrier conditions, the overlapping coverage length, the node connection length, and the distance of the blocking location are extracted, and the dual evidence blocking coupling value is calculated.

[0061] The expression for calculating the dual-evidence blocking coupling value is as follows: ; In the formula, This represents the dual-evidence blocking coupling value. This indicates the length of overlap between evidence of continuous distribution of intact surrounding rock and evidence of low-permeability barrier conditions at the same blocking location. This indicates the length of the cover along the outward leakage direction of the evidence of continuous distribution of intact surrounding rock at the node connection. This indicates the length of coverage along the leakage direction of the nodal connection, representing evidence of low-permeability barrier conditions. Indicates the node connection length. This represents the distance between the blocking location corresponding to the evidence of continuous distribution of intact surrounding rock and the blocking location corresponding to the evidence of low permeability barrier conditions. When the blocking coupling value of the two evidences reaches the blocking determination threshold (example range: 0.60 to 0.85), the lower limit is set according to the minimum requirement for the two types of blocking evidence to form a common coverage, and the upper limit is set according to the strict requirement that the two types of blocking evidence overlap near the same blocking location, have balanced coverage, and fit closely in position. The higher the blocking reliability requirement, the higher the value is taken, and the corresponding node connection is identified as an interrupted node connection.

[0062] Interrupted node connections are marked with blocking processing markers, and the blocking location and the source of blocking evidence are recorded. Node connections that are not cut off by evidence of continuous distribution of intact surrounding rock and evidence of low permeability barrier conditions, and can still connect with the next node connection along the leakage direction, are retained as traceable connection nodes. Node connections with inconsistent location orientations, leakage directions that cannot be continued, or evidence content that cannot prove the blocking relationship are not considered as traceable connection nodes, and the blocked connection set is obtained.

[0063] It should be noted that the dual-evidence blocking coupling value is set based on the judgment logic that the node connection is jointly severed by evidence of continuous distribution of intact surrounding rock and evidence of low-permeability barrier conditions. Evidence of continuous distribution of intact surrounding rock and evidence of low-permeability barrier conditions need to fall in the outward direction of the same node connection and form overlapping coverage near the blocking position. The more sufficient the overlapping coverage, the more effectively the two types of evidence can jointly prove that the node connection has been severed. The coverage length of the evidence of continuous distribution of intact surrounding rock and the coverage length of the evidence of low-permeability barrier conditions need to be relatively balanced to avoid determining that the blocking is established based solely on the larger range of a single piece of evidence. The closer the blocking position corresponding to the evidence of continuous distribution of intact surrounding rock and the blocking position corresponding to the evidence of low-permeability barrier conditions are, the more concentrated the two types of evidence point to the same blocking position. The dual-evidence blocking coupling value simultaneously constrains evidence overlap, coverage balance, and positional fit, and can be used to determine whether the corresponding node connection should be marked as blocked.

[0064] S3.4: Based on the blocked connection set, starting with the candidate gas storage cavern, verify the node connection along the leakage direction, encapsulate the node connection that has not been marked with the blocking treatment and the node that can be continuously connected to the previous node as a traceable channel, and encapsulate the node connection that has been marked with the blocking treatment, the node connection that is blocked by the evidence of continuous distribution of intact surrounding rock and the evidence of low permeability barrier conditions as a blocked channel, and obtain the underground leakage channel connectivity map.

[0065] Furthermore, the blocking connection set is expanded according to the location of the candidate gas storage cavern. Starting from the candidate gas storage cavern, the node connections are checked one by one along the leakage direction. Node connections that have not been marked with blocking processing and can be continuously connected from the candidate gas storage cavern outward are encapsulated as traceable channels. Node connections that have any of the following conditions: position disconnection, direction reversal, or object jump are not encapsulated as traceable channels.

[0066] Furthermore, the blocking connection set is expanded according to the location of the candidate gas storage cavern. Starting from the candidate gas storage cavern, the node connections are checked one by one along the leakage direction. Node connections that have not been marked with blocking processing and can be continuously connected from the candidate gas storage cavern outward are encapsulated as traceable channels. Node connections that have any of the following conditions: position disconnection, direction reversal, or object jump are not encapsulated as traceable channels.

[0067] It should be noted that outward tracing relationship refers to the connection relationship that starts from the candidate gas storage cavern and continues to extend to the outside of the gas storage closed system along unblocked fissures, faults, fracture zones or permeable layers.

[0068] S4: Perform path tracing on the underground leakage channel connectivity map, identify the blocking treatment markers in the path, stop the extension of the path that is terminated due to the blockage and eliminate the path, lock the high-risk path that can be continuously connected from the candidate gas storage cavern to the external leakage boundary, and obtain the risk chain of the candidate site selection object. S4.1: Obtain the node connections in the underground leakage channel connection diagram, write the leakage direction starting from the candidate gas storage chamber, connect the nodes with the same direction and continuous connection into a candidate tracking path, and complete the labeling according to three types of status: trackable, blocked and to be stopped, and abnormal and to be eliminated, and generate a candidate tracking path diagram. Furthermore, the node connections in the underground leakage channel connection diagram are retrieved according to the location of the candidate gas storage chamber. Taking the candidate gas storage chamber as the starting point of the path, the connection direction is compared segment by segment along the node connection without the written blocking treatment mark. The node connection that can extend from the candidate gas storage chamber to the external leakage boundary is determined as the connection with the same leakage direction. The node connection with reversed direction, disconnected position or connected to the blocking channel is excluded to obtain the candidate tracking path.

[0069] Candidate tracing paths are labeled with their status segment by segment according to the direction of leakage. Paths that can continue to connect to the next node are written as traceable, paths that connect to the blocked channel are written as blocked and to be stopped, and paths with inconsistent directions or broken positions are written as abnormal and to be eliminated. The path starting point, connection order and path status are fixed in the same graph structure to generate a candidate tracing path graph.

[0070] S4.2: Identify blocking markers in the candidate tracing path graph, and perform path interception at the node connection where the blocking marker is located, stopping the path extension after the blocking position, while fixing the interception position and the path segment before interception to obtain the intercepted path segment; Furthermore, the candidate tracking path map searches the path status segment by segment according to the location of the candidate gas storage chamber and the direction of leakage, and reads the path status and blocking processing mark carried by each node connection; when a node connection carries a blocking processing mark, the node connection where the blocking processing mark is located is determined as the path interception position, and it is verified whether the blocking processing mark is consistent with the blocking position and the source of blocking evidence in the blocking connection set; the path interception is performed on the node connection where the blocking processing mark is located.

[0071] The node connection outside the path interception position stops extending and no longer connects to the next leakage channel node; the node connection inside the path interception position that has been continuously connected is retained, and the interception position and the path segment before interception are fixed according to the candidate gas storage chamber, leakage direction and path connection sequence; the path segment with reversed direction, broken position or unable to correspond to the blocking treatment mark is excluded, and the retained interception position and the path segment before interception are combined to obtain the interception path segment.

[0072] S4.3: Eliminate blocked and terminated paths in the intercepted path segment, and verify the continuous connection relationship of adjacent nodes in the unblocked extension path and the consistency of the path extension direction pointing to the external leakage boundary. Take the unblocked extension path with continuous nodes and consistent leakage direction as the candidate path for connection. Furthermore, the interception path segments are screened one by one according to the location and status of the candidate gas storage caverns. Paths whose endpoints fall at the blocking treatment mark, whose outer side has stopped extending, and which cannot continue to the external leakage boundary are marked as blocked termination paths. Blocked termination paths are removed from the subsequent breakthrough judgment range, so that paths that have been cut off by evidence of continuous distribution of intact surrounding rock or evidence of low permeability barrier conditions are no longer involved in the leakage breakthrough judgment.

[0073] Unblocked extension paths are traced segment by segment along the leakage direction. Paths that can be connected between adjacent nodes, have no breaks in the path, no node jumps, and no missing connections are retained. Paths that reverse direction, circle back to the candidate gas storage chamber, or deviate from the external leakage boundary are eliminated. Unblocked extension paths with continuous nodes and consistent leakage direction are fixed as through candidate paths.

[0074] S4.4: Verify the connection of the leakage boundary based on the candidate connection route. When the candidate connection route starts from the candidate gas storage cavern, extends continuously along the nodes that have not been marked with the blocking treatment, and reaches the external leakage boundary of the gas storage closed system, the corresponding candidate connection route will be marked as a high-risk locked route. Furthermore, the candidate path is traced segment by segment along the leakage direction, starting from the candidate gas storage chamber. Each segment of the node connection is read to see if it carries a blocking treatment mark. Paths that do not carry a blocking treatment mark and can be connected to the next node are retained. Paths that encounter blocking treatment marks, connection breaks, direction reversals or connection interruptions are stopped from being judged as paths to be connected.

[0075] The reserved path continues to extend outward until the path ends at the external leakage boundary of the gas storage closed system. When the candidate path extends continuously from the candidate gas storage chamber to the external leakage boundary of the gas storage closed system, and no blocking treatment mark is written for any of the nodes in the path, a high-risk locking mark is written, and the corresponding candidate path is marked as a high-risk locking path.

[0076] It should be noted that the external leakage boundary of a gas storage closed system refers to the boundary location outside the surrounding rock, barrier layer, or sealing structure used to seal compressed air around the candidate gas storage cavern, where gas may continue to leak out or pressure may be transmitted outward.

[0077] S4.5: According to the candidate site selection objects, high-risk locking routes with the same starting point corresponding to the same candidate gas storage cavern location are classified under the same candidate site selection object, and connected in series according to the leakage direction and path connection order to obtain the risk chain of the candidate site selection objects.

[0078] Furthermore, each candidate site is matched one-to-one with a candidate gas storage cavern location. High-risk locking paths are matched one by one with the candidate gas storage cavern locations according to their starting points. High-risk locking paths whose starting points fall into the same candidate gas storage cavern location are classified into the same candidate site, and the starting point location, leakage direction, continuous node connection, and the location of reaching the external leakage boundary of the gas storage closed system are marked. High-risk locking paths with inconsistent starting points or that cannot correspond to candidate site locations are excluded.

[0079] High-risk locking paths under the same candidate site are connected in series according to the direction of leakage and the order of path connection. The high-risk locking paths that can be continuously connected from the candidate gas storage cavern to the external leakage boundary of the gas storage closed system are fixed as a chain record. When multiple high-risk locking paths correspond to the same candidate site, the links are retained according to different leakage directions and are not merged with each other, so that different leakage risk sources are retained separately, and the risk chain of the candidate site is obtained.

[0080] It should be noted that the risk chain of candidate site selection objects refers to the risk record formed by connecting the leakage paths that have been marked as high-risk lock-in paths under the corresponding candidate gas storage cavern locations, with the same candidate site selection object as the belonging object, according to the leakage direction and path connection sequence. It is used to indicate that there is a risk of leakage from the candidate gas storage cavern to the external leakage boundary of the gas storage closed system.

[0081] The external leakage boundary of the gas storage closed system includes at least one of the following: fault exposure boundary, fracture zone extension boundary, strong aquifer connectivity boundary, surface connectivity boundary, and underground engineering connectivity boundary; when the endpoint of the candidate route forms a spatial connectivity relationship with any of the above boundaries, the candidate route is considered to have reached the external leakage boundary of the gas storage closed system.

[0082] S5: Based on the risk chain and minimum closed evidence chain of candidate site selection objects, locate the unclosed links and generate supplementary evidence objects, and perform leakage risk judgment to form risk judgment objects. Sort the candidate objects that have not triggered leakage risk judgment according to the supporting conditions and generate site selection evaluation results.

[0083] S5.1: Based on the candidate site selection objects, perform chain evidence alignment on the risk chain and minimum closed evidence chain of the candidate site selection objects, and assign them to the initial positions of evidence to be verified, risk to be adjudicated, and sorting to be processed, to obtain the chain evidence comparison table; Furthermore, the candidate site selection object serves as an alignment marker, and the high-risk locking path corresponding to the risk chain of the candidate site selection object is matched item by item with the candidate gas storage cavern location, burial depth, surrounding rock pressure conditions, and sealing and blocking conditions corresponding to the minimum closed evidence chain; when both risk chain records and evidence chain records exist under the same candidate site selection object, the two types of records are placed in the same comparison row, and the missing items in the evidence chain or risk chain are marked as the locations to be filled.

[0084] Candidate site selection objects with completed chain evidence alignment are assigned to the initial position according to their status. Candidate site selection objects with missing items in the minimum closed evidence chain are assigned to evidence pending verification. Candidate site selection objects with high-risk locking paths in their risk chains are assigned to risk pending adjudication. Candidate site selection objects with complete evidence and no high-risk locking paths are assigned to sorting pending processing. The corresponding candidate gas storage cavern locations and link correspondences are retained to obtain a chain evidence comparison table.

[0085] It should be noted that the same comparison row refers to using the same candidate site selection object as a row in the chain evidence comparison table, putting the risk chain content and the minimum closed evidence chain content of the corresponding candidate site selection object together, so as to facilitate simultaneous checking whether the evidence is complete and whether the risk exists.

[0086] S5.2: Based on the chain evidence comparison table, find the missing, broken and unconnectable positions in the access closure path, generate supplementary evidence pointers, write the supplementary evidence status for candidate objects with the above positions, indicate the evidence content that needs to be supplemented, mark the candidate objects as supplementary evidence objects, transfer the candidate location objects with closed evidence chains to the leakage risk judgment position, and obtain the supplementary evidence processing table. Furthermore, the chain evidence comparison table is screened item by item according to the candidate site selection objects. The candidate gas storage cavern location, burial depth conditions, surrounding rock pressure conditions, and airtight enclosure conditions corresponding to the minimum closed evidence chain are compared with the access closure path in turn to find the location where the chain position is missing, the condition is broken, the evidence is locked by the break point, or the evidence cannot be connected. When it is found that the access closure path cannot be continuously extended from the candidate gas storage cavern location to the airtight enclosure condition, the broken position is marked as an unclosed link, and the unclosed link is matched with the data content that needs to be supplemented and the candidate gas storage cavern location to generate supplementary evidence direction.

[0087] Candidate site selection objects with unclosed links are marked as supplementary evidence objects, and the corresponding unclosed links and supplementary evidence directions are retained; candidate site selection objects whose access closure path can continuously cover the candidate gas storage cavern location, burial depth conditions, surrounding rock pressure conditions and airtight enclosure conditions are judged as having closed evidence chains and are transferred to the leakage risk assessment position; supplementary evidence objects and candidate site selection objects transferred to the leakage risk assessment position are grouped according to the candidate site selection objects to obtain a supplementary evidence processing table.

[0088] S5.3: Retrieve the candidate site selection objects to be adjudicated from the supplementary certificate processing table, mark the candidate objects with leakage and connection risks as risk adjudication objects, and transfer the candidate site selection objects that have not triggered leakage risk adjudication to the supporting conditions sorting position to obtain the adjudication processing table. Furthermore, the supplementary certification processing table retrieves the candidate site selection objects to be judged according to the location of the leakage risk judgment, matches the risk chain of the candidate site selection object corresponding to the candidate site selection object with the location of the candidate gas storage cavern, and reads the high-risk locking path in the risk chain of the candidate site selection object; the high-risk locking path is the path that is continuously connected from the candidate gas storage cavern along the node without the written blocking treatment mark to the external leakage boundary of the gas storage closed system. When a high-risk locking path exists, it is determined that there is a risk of leakage penetration, and the corresponding candidate object is marked as a risk judgment object.

[0089] Candidate site selection objects that have not formed a high-risk locking road will not trigger leakage risk judgment and will be transferred to the supporting condition sorting position; risk judgment objects retain the corresponding high-risk locking road and external leakage boundary position, and candidate site selection objects that have not triggered leakage risk judgment retain the supporting condition sorting entry to obtain the judgment processing table.

[0090] S5.4: Based on the adjudication processing table, retrieve the corresponding conditions for candidate site selection objects that have not triggered the risk of leakage adjudication, and perform priority sorting to obtain the corresponding sorting table. Supporting conditions refer to the transportation access, power grid access, construction organization, and engineering support conditions that candidate sites that have not triggered the risk of leakage must rely on during construction and operation.

[0091] Furthermore, the judgment processing table screens out candidate site selection objects that have not triggered the leakage risk judgment based on the leakage risk judgment results, retrieves the corresponding supporting conditions, and matches the supporting conditions with the candidate gas storage cavern locations item by item. It retains the transportation access content, power grid access content, construction organization content, and engineering supporting content that can directly serve construction and operation, and removes the content that cannot correspond to the candidate site selection object, only describes regional conditions, or cannot be used for ranking and comparison.

[0092] Candidate site selection objects that have not triggered the risk of leakage are compared one by one according to their supporting conditions. Priority is calculated according to access distance, access difficulty, construction constraints, and completeness of supporting facilities. Candidate site selection objects with shorter access distance, lower access difficulty, fewer construction constraints, and higher completeness of supporting facilities are ranked first. The ranking position of each candidate site selection object is written into the corresponding record to obtain the supporting facilities ranking table.

[0093] S5.5: Based on the supporting sorting table, write the supplementary certification object, risk judgment object and candidate site selection object that has completed the site selection priority sorting process into the supplementary certification status, risk judgment status and preferred sorting status respectively, and generate site selection evaluation results according to the level.

[0094] Furthermore, the supporting sorting table organizes each candidate site selection object one by one, classifying supplementary certification objects, risk assessment objects, and candidate site selection objects that have completed site selection priority sorting into different levels; supplementary certification objects are written with a supplementary certification status, and corresponding to unclosed links and supplementary certification directions; risk assessment objects are written with a risk assessment status, and corresponding to leakage and high-risk locked roads; candidate site selection objects that have completed site selection priority sorting are written with a preferred sorting status, and corresponding to their sorting positions in the supporting sorting table.

[0095] The supplementary evidence status, risk assessment status, and preferred ranking status are arranged in a hierarchical order of supplementary evidence priority, risk assessment, and preferred ranking. Candidate site selection objects that require supplementary evidence are placed at the supplementary evidence level, candidate site selection objects with leakage and connection risks are placed at the risk assessment level, and candidate site selection objects that have not triggered leakage risk assessment and have completed site selection priority ranking are placed at the preferred ranking level. The site selection evaluation results include candidate site selection object identifier, evaluation status, corresponding minimum closed evidence chain, corresponding candidate site selection object risk chain, supplementary evidence direction, risk assessment reason, and corresponding ranking position.

[0096] In summary, this invention forms a minimum closed evidence chain by mapping candidate object evidence fragments, verifying connections, and progressively closing the chain. This chain is used to exclude background evidence and breakpoint evidence, thereby improving the stability of the admission judgment for candidate gas storage caverns. Furthermore, by transforming conductive evidence, processing blocking evidence, and tracing paths, an underground leakage channel connectivity diagram and a risk chain for candidate site selection are formed. This chain is used to assess leakage risks and improve the accuracy of identifying closed risks.

[0097] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for site selection evaluation of compressed air energy storage based on multi-source data analysis, characterized in that, include: Based on the location of the candidate gas storage cavern, the access data is subject to object fitting and cropping. Only the valid content that can point to the gas storage conditions of the candidate gas storage cavern is extracted, and the background content that cannot form a corresponding relationship with the candidate gas storage cavern is excluded, so as to obtain the candidate object evidence fragment. The candidate object evidence fragments are mapped to the same spatial reference, and the connection verification and progressive closure are performed to form an admission closure path. The admission closure path is then closed and locked to obtain the minimum closed evidence chain. Based on the minimum closed chain of evidence, conduction evidence connected to the candidate gas storage chamber is extracted, and the continuous conduction evidence is transformed into leakage channel nodes and node connections. The conduction content interrupted by intact surrounding rock and low-permeability barrier conditions is blocked to obtain the underground leakage channel connectivity diagram. The path of underground leakage channel is traced, the blocking treatment mark in the path is identified, the path terminated due to blocking is stopped and the path is eliminated, and the path that can be continuously connected from the candidate gas storage cavern to the external leakage boundary is locked with high risk, so as to obtain the risk chain of candidate site selection. Based on the risk chain and minimum closed evidence chain of candidate sites, the system locates unclosed links and generates supplementary evidence objects, performs leakage risk judgment to form risk judgment objects, sorts candidate objects that have not triggered leakage risk judgment according to supporting conditions, and generates site selection evaluation results.

2. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 1, characterized in that, The specific steps for object-fitting and cropping of the accessed data are as follows: The access data is spatially correlated with the locations of candidate gas storage caverns, and the access data is excluded from the object selection by using the influence range of the candidate gas storage caverns as the clipping boundary, thus obtaining the cavern location set. The effective data content of the cavern location set is obtained. Taking the location of the candidate gas storage cavern as the object benchmark, the content of the effective data content that falls within the influence range of the candidate gas storage cavern is extracted. The content that cannot point to the gas storage conditions of the candidate gas storage cavern is eliminated according to the burial depth conditions, surrounding rock pressure conditions and sealing and blocking conditions, so as to obtain the matching content set.

3. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 2, characterized in that, The obtained candidate object evidence fragment is as follows: Based on the influence range of the candidate gas storage cavern, the gas storage conditions of the candidate gas storage cavern, and the connection relationship of the access chain, the cavern correspondence of the attached content is verified. The attached content that corresponds to the location, has clear conditions and can be connected to the access closure path is retained as gas storage evidence content. The attached content that has location deviation, only describes the background, and cannot participate in any of the access closure situations is separated into background content, thus obtaining the gas storage evidence set. Each candidate gas storage cavern location is treated as a candidate site selection object. The gas storage evidence set is objectified and encapsulated to obtain candidate object evidence fragments.

4. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 1, characterized in that, The formation of the admission closed path is as follows: The candidate object evidence fragments are mapped to the same spatial reference according to the location of the candidate gas storage cavern to form a unified spatial landing point, and the candidate object evidence fragments that cannot fall into the same spatial reference are removed from the access processing range to obtain a spatial mapping set. Based on the engineering conditions of the candidate gas storage caverns, the evidence fragments of the candidate objects in the spatial mapping set are arranged into an admission chain position to obtain an admission sequence. The admission sequence is verified segment by segment according to the evidence fragments of adjacent candidate objects. When adjacent fragments can be connected continuously and are connected according to the admission chain position, they are retained. When there is a spatial break, chain position inversion or missing condition, the breakpoint is locked to obtain the verification sequence. Based on the verification sequence, the evidence fragments of candidate objects are connected to the admission closed path according to the progressive relationship of the admission conditions. The evidence fragments of candidate objects that do not correspond to the location of the candidate gas storage cavern or cannot be connected in the progressive relationship of the admission conditions are excluded, thus obtaining the admission closed path.

5. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 1 or 4, characterized in that, The minimum closed chain of evidence is obtained as follows: The evidence segments are examined one by one along the closed access path. The evidence segments that are continuously connected in sequence according to the burial depth, surrounding rock pressure and airtightness, starting from the location of the candidate gas storage cavern and not locked by the breakpoint are fixed into a chain structure to obtain the access evidence chain. The access evidence chain is screened according to the sequential relationship of the access closure path. Duplicate content, content that deviates from the continuous path, and content that is locked at breakpoints are eliminated. Continuous evidence that can be connected sequentially and complete the access closure is retained to obtain the minimum closed evidence chain.

6. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 5, characterized in that, The process of converting continuously received continuity evidence into leakage channel nodes and node connections is as follows: Based on the minimum closed chain of evidence, the candidate gas storage cavern is used as the starting point of the connection. The connection content connected to the candidate gas storage cavern is attached to the position of the candidate gas storage cavern, and the leakage direction is written according to the direction of the connection content extending from the candidate gas storage cavern to the external leakage boundary, so as to obtain the connection evidence set. Based on the continuity evidence set, the leakage direction is pre-formed into a chain according to the sequential order of the smallest closed evidence chain. The continuously extending continuity evidence is transformed into leakage channel nodes and node connections. Continuation breakpoints are set at the interruption of the continuity direction and the jump of the continuity object to obtain the node connection set.

7. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 6, characterized in that, The obtained underground leakage channel connectivity diagram is as follows: Based on the node connection set, the evidence content in the minimum closed evidence chain is mapped to the node connection. Node connections interrupted by evidence of continuous distribution of intact surrounding rock and evidence of low permeability barrier conditions are marked with blocking treatment, and traceable connection nodes are retained to obtain the blocked connection set. Based on the blocked connection set, starting with the candidate gas storage cavern, the node connections are verified along the leakage direction. Nodes that have not been marked with blocked treatment and can be continuously connected are encapsulated as traceable channels. Nodes that have been marked with blocked treatment and are blocked by evidence of continuous distribution of intact surrounding rock and evidence of low permeability barrier conditions are encapsulated as blocked channels, thus obtaining the underground leakage channel connectivity map.

8. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 7, characterized in that, The specific steps for stopping the extension of paths terminated due to blockage and eliminating those paths are as follows: Obtain the node connections in the underground leakage channel connectivity diagram, write the leakage direction starting from the candidate gas storage chamber, connect the nodes with the same direction and continuous connection into a candidate tracking path, and complete the labeling according to three types of status: trackable, blocked and to be stopped, and abnormal and to be eliminated, and generate a candidate tracking path diagram. Identify blocking markers in the candidate tracing path graph, and perform path interception at the node connection where the blocking marker is located to stop the path extension after the blocking position. At the same time, fix the interception position and the path segment before the interception to obtain the intercepted path segment. The blocked and terminated paths in the intercepted path segment are excluded, and the continuity of adjacent nodes in the unblocked extension path and the consistency of the path extension direction pointing to the external leakage boundary are verified. Unblocked extension paths with continuous nodes and consistent leakage direction are selected as candidate paths for connection.

9. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 8, characterized in that, The risk chain for obtaining candidate site selection objects is as follows: Based on the candidate through-path, the external leakage boundary is verified. When the candidate through-path starts from the candidate gas storage cavern, extends continuously along the nodes that have not been marked with the blocking treatment, and reaches the external leakage boundary of the gas storage closed system, the corresponding candidate through-path is marked as a high-risk locked path. According to the candidate site selection objects, high-risk locking routes with the same starting point corresponding to the same candidate gas storage cavern location are classified under the same candidate site selection object, and connected in series according to the leakage direction and the path connection order to obtain the risk chain of the candidate site selection objects.

10. The compressed air energy storage site selection evaluation method based on multi-source data analysis as described in claim 9, characterized in that, The specific details of generating the site selection evaluation results are as follows: Based on the candidate site selection objects, the risk chains and minimum closed evidence chains of the candidate site selection objects are aligned, and they are assigned to the initial positions of evidence to be verified, risk to be adjudicated, and sorting to be processed, thus obtaining a chain evidence comparison table. Based on the chain evidence comparison table, the missing, broken, and unconnectable positions in the access closure path are found, and supplementary evidence pointers are generated. Candidate objects with the above positions are written to the supplementary evidence status, indicating the evidence content that needs to be supplemented. The candidate objects are marked as supplementary evidence objects, and the candidate location objects with closed evidence chains are transferred to the leakage risk judgment position to obtain the supplementary evidence processing table. Retrieve candidate site selection objects to be adjudicated from the supplementary certificate processing table, mark the candidate objects with leakage and connection risks as risk adjudication objects, and transfer the candidate site selection objects that have not triggered leakage risk adjudication to the supporting conditions sorting position to obtain the adjudication processing table. Based on the adjudication processing table, retrieve the corresponding conditions for candidate site selection objects that have not triggered the risk of leakage adjudication, and perform priority sorting to obtain the corresponding sorting table. Based on the matching sorting table, the supplementary certification objects, risk adjudication objects, and candidate site selection objects that have completed the site selection priority sorting process are respectively written into the supplementary certification status, risk adjudication status, and preferred sorting status, and the site selection evaluation results are generated according to the hierarchy.

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