Hypersalinity mine water deep well ex-situ recharge resource water retention and restoration method

Abstract

The invention discloses a high-salinity mine water deep well ex-situ recharge resource water retention and remediation method, and belongs to the technical field of mine water recharge and underground water supply. The method comprises the following steps: collecting and analyzing basic data, investigating geothermal development conditions, and determining underground water consumption conditions and water quality characteristics of each water-containing geothermal layer; based on the water quality safety principle and the mining safety principle, a proper recharge target aquifer is screened; establishing a three-dimensional underground water numerical model, simulating the influence of different recharge amounts, hole numbers and intervals on an underground water flow field, obtaining the relationship between the maximum water level uplift and the parameters, and forming various recharge schemes; and by taking mining safety as a red line and combining economic indexes, performing water filling strength evaluation on the scheme under a long-term recharge condition, and determining an optimal recharge scheme. According to the method, resource utilization of the high-salinity mine water is achieved, stable supply is provided for geothermal reservoirs, the mine water treatment cost can be reduced, coal mining safety is guaranteed, and the method has important significance on coal-water-heat collaborative mining.

Description

Technical Field

[0001] This invention relates to the field of mine water reinjection and groundwater recharge technology, specifically to a resource-based water conservation and restoration method for deep well in-situ reinjection of high-mineralization mine water. Background Technology

[0002] Mine water resources are an important component of unconventional water resources, but their utilization rate is currently low. High mineralization (TDS > 1000 mg / L) is a major contributing factor. Traditional methods for addressing high-mineralization mine water involve reducing ion content through physical, chemical, or microbial methods until it meets standards before reuse or discharge. However, these methods are costly and can lead to significant water loss. In recent years, the deep-well sealing method for mine water has emerged, which preserves high-mineralization mine water in deep geological formations and offers promising economic and ecological prospects.

[0003] In recent years, my country has actively developed geothermal resources, with hydrothermal low-temperature geothermal energy experiencing rapid development due to its relatively low development difficulty. However, the increasing demand for extraction is at odds with the regional groundwater recharge capacity, leading to a continuous decline in groundwater levels and severely impacting the sustainable development of geothermal resources. Deep geothermal reservoirs, due to their weak deep circulation recharge capacity, slow original groundwater flow, and higher mineralization, experience a more significant drop in groundwater levels caused by geothermal extraction, necessitating a stable water supply. Therefore, attempting to reinject high-mineralization mine water into even more mineralized hydrothermal reservoirs through deep wells to achieve the resource utilization of high-mineralization mine water, providing artificial and stable recharge for Ordovician limestone geothermal reservoirs, and thus achieving efficient development and utilization of unconventional water resources, is crucial to addressing the water shortage problem caused by the overload of regional hydrothermal reservoirs and promoting the effective synergistic exploitation of regional coal-water-heat resources. This has become an important issue that urgently needs to be resolved. Summary of the Invention

[0004] The purpose of this invention is to propose a method for resource-based water conservation and restoration of deep wells with high mineralization, in order to solve the problem of resource utilization of mine water in the existing technology.

[0005] The technical solution adopted in this invention is: a method for resource-based water conservation and restoration of deep well water with high mineralization, comprising the following steps:

[0006] Step S1: Collect basic data on the formation mechanism and hydrochemical characteristics of mine water in the study area, analyze the hydrogeological structure of mine water inflow, and clarify the mine water inflow source, inflow channel, inflow intensity and hydrochemical characteristics.

[0007] Step S2: Investigate the geothermal development in the region and clarify the groundwater consumption and water quality characteristics of each aquifer geothermal layer;

[0008] Step S3: Based on the principles of water quality safety and mining safety, select target aquifers for recharge;

[0009] Step S4: Establish a three-dimensional groundwater numerical model, and obtain the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes through simulation, so as to form different recharge schemes;

[0010] Step S5: Under long-term reinjection conditions, taking mining safety as the red line and using the economic indicators of reinjection for local optimization, evaluate the water filling intensity of different reinjection schemes and determine the optimal reinjection scheme.

[0011] As a further improvement of the present invention, in step S3, the method for determining water quality safety is as follows:

[0012] (1) Compare the water quality of mine water with that of geothermal reservoir water. The water quality of mine water should be better than that of geothermal reservoir water.

[0013] (2) The indoor water-water mixing test, water-rock interaction test, on-site water quality monitoring and PHREEQC numerical simulation method were used to analyze whether mine water recharge would deteriorate the groundwater quality.

[0014] As a further improvement of the present invention, in step S3, the method for determining mining safety is as follows: the water filling intensity of the target aquifer to the mine excavation space is not higher than the Class II water filling intensity. The Class II water filling intensity refers to the aquifer having medium or higher water content, but being indirectly connected to the underground excavation space only through interlayer crossflow, without direct water-conducting channels, and not participating in the formation of mine water.

[0015] As a further improvement of the present invention, in step S4, the method for constructing the three-dimensional groundwater numerical model is as follows: based on borehole data, a three-dimensional aquifer geological model is established using GMS, and hydrogeological parameters are assigned values ​​based on measured data. After fitting and verification, the three-dimensional groundwater numerical model is obtained.

[0016] As a further improvement of the present invention, in step S4, the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes is obtained through simulation. Specifically, the simulation results are fitted with the recharge volume, the number of recharge holes, and the spacing between recharge holes as independent variables and the maximum water level rise as the dependent variable to obtain the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes. The relationship is as follows:

[0017] y = f1x1 + f2x2 + f3x3,

[0018] In the formula, y is the maximum rise in water level, x1 is the recharge amount, f1 is the weighting coefficient of the recharge amount; x2 is the number of recharge holes, f2 is the weighting coefficient of the number of recharge holes; x3 is the spacing between recharge holes, f3 is the weighting coefficient of the spacing between recharge holes.

[0019] As a further improvement of the present invention, in step S4, the simulation specifically includes:

[0020] (1) Simulate the effect of different recharge flow rates on the groundwater flow field of the target aquifer under the condition of fixed spacing of multi-hole recharge;

[0021] (2) The influence of different control spacing on the groundwater flow field of the target aquifer under simulated fixed flow rate of multi-pore recharge.

[0022] As a further improvement of the present invention, in step S5, the economic indicator F includes drilling cost, subsequent management cost, reinjection water treatment cost, and cost savings of mine water reinjection compared to current water treatment methods:

[0023] F = f w (x1)-f p (x2)-f m (x2,x3),

[0024] Among them, f w (x1)=(c cost- Fill-c cost- (original) x1,

[0025]

[0026] f m (x2,x3)=c inspect x2+c management x2x3

[0027] In the formula, f w Saves costs for mine water reinjection; p For drilling costs; f m For subsequent management costs; c cost-灌 c is the unit cost of mine water reinjection; cost-原 The unit cost of existing mine water treatment; h is the depth of the reinjection well; c cost-井 The cost of constructing a reinjection well per unit depth; c inspect To maintain and repair costs; c management The cost is the daily operation and maintenance cost; the economic indicator F is the cost of mine water reinjection minus the well construction cost and subsequent management cost.

[0028] As a further improvement of the present invention, in step S5, the evaluation of the water filling intensity of different reinjection schemes specifically includes:

[0029] (1) Estimate the maximum water level rise and analyze the factors that may cause sudden water flow disasters due to the water level rise;

[0030] (2) Assess whether the relationship between the water source and the water channel and the water intensity have changed, and predict the potential water inrush induced by the recharge.

[0031] Compared with the prior art, the present invention has the following technical effects:

[0032] 1. The high-mineralization mine water deep well ex-situ reinjection resource conservation and water restoration method of the present invention, by reinjecting mine water into local geothermal reservoirs with development and utilization value but with water quality inferior to mine water, provides a stable and effective artificial replenishment of groundwater resources in the region where geothermal reservoirs are continuously decreasing. At the same time, it reduces the mine water treatment cost of coal enterprises, realizes the efficient utilization of water resources by classification and categorization, and is of great significance for maintaining the balance of local groundwater resources and realizing the positive synergistic co-extraction of "coal-water-heat" in the sustainable green and collaborative mining of geothermal and mining industries.

[0033] 2. Based on water quality safety and mining safety principles, this invention enables mine water to simultaneously meet the needs of ecological and environmental protection as well as the safe and efficient production of coal enterprises. Through water quality safety analysis, suitable mine water treatment methods or processes are determined, enabling the reinjection of high-salinity mine water without treatment or with minimal treatment. This eliminates the need for traditional desalination and purification processes for high-mineralization mine water (or requires only minimal treatment), while reducing water resource losses and directly lowering the water treatment and operating costs of coal enterprises. It ensures that the overall quality of the mine water is superior to that of the original groundwater and does not negatively impact local groundwater. Furthermore, by analyzing the hydrogeological conditions of the mine's water inflow, the water inflow intensity is classified to ensure that the target geothermal aquifer for reinjection is not a primary water-bearing aquifer during safe mine production, thus ensuring mining safety.

[0034] 3. By optimizing the water pressure limit of the safety production red line and local economic optimization, different reinjection schemes are optimized in the long-term reinjection process of mine water: the long-term water level rise is predicted by the three-dimensional groundwater numerical model of deep well ex-situ reinjection of mine water resources, the economic index function is optimized to select the benefits of different schemes, and finally the most suitable reinjection scheme is determined. Attached Figure Description

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 This is a flowchart of the optimized method for water retention and restoration of deep wells with high mineralization mine water according to the present invention.

[0037] Figure 2 This is a comparison diagram of the Ordovician aquifer water quality and mine water quality in the embodiment;

[0038] Figure 3 This is a comparison chart of the numerical simulation results and measured values ​​of groundwater numerical model;

[0039] Figure 4This is a simulation diagram showing the impact of different recharge flow rates on the groundwater flow field under the condition of fixed spacing of multi-hole recharge.

[0040] Figure 5 This is a simulation diagram showing the impact of different control spacings on the groundwater flow field under fixed flow conditions of multi-hole recharge. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0042] The following is a typical example of a resource-based water conservation and restoration technology for deep mine water with high mineralization, and an optimized embodiment thereof. The implementation process of the optimized method of the present invention is illustrated by describing this embodiment.

[0043] Please refer to Figure 1 The specific steps of the method for resource-based water conservation and restoration of deep mine water with high salinity proposed in this invention are as follows:

[0044] Step S1: Collect basic data on the formation mechanism and hydrochemical characteristics of mine water in the region, analyze the hydrogeological structure of mine water inflow, and clarify the mine water inflow source, inflow channel, inflow intensity, and hydrochemical characteristics. Table 1 shows the classification of mine water inflow source, inflow channel, and inflow intensity levels for a certain mine in North China, and Table 2 shows the statistical information on the mine water quality indicators. The definition of the inflow intensity level is as follows:

[0045] Class I water-filling intensity: The aquifer has weak water-bearing capacity and is only indirectly connected to the underground mining space by interlayer flow. There is no direct water-conducting channel and it does not directly participate in the formation of mine water.

[0046] Class II water-filling intensity: The water-bearing capacity of the aquifer is medium or above, but it is only indirectly connected to the underground mining space through interlayer flow, without direct water-conducting channels, and does not participate in the formation of mine water;

[0047] Class III water-bearing intensity: The aquifer has weak water-bearing capacity, but it is directly connected to the underground space through mining-induced fractures or water-conducting faults, participating in the formation of mine water, with a water inflow contribution of <50m³. 3 / h;

[0048] Class IV water-bearing intensity: The aquifer has a medium or higher water-bearing capacity and is directly connected to the underground space through mining-induced fractures or faults, participating in the formation of mine water, with a water inflow contribution of <200m³. 3 / h;

[0049] Class V water inflow intensity: The aquifer has a medium or higher water-bearing capacity and is directly connected to the underground space through mining-induced fractures or faults, participating in the formation of mine water, with a water inflow ≥200m³. 3 / h. Water intensities of Class I and II do not pose a threat to safe coal mine production.

[0050] Table 1

[0051]

[0052] The mine's water sources are primarily the Permian Shihezi Group sandstone aquifer, the sandstone aquifers on the roof and floor of the No. 3 coal seam, and the third layer of limestone aquifer in the Taiyuan Formation, with water levels of IV, V, and IV, respectively. The water inflow channels are mainly the roof water-conducting fracture zone, roof collapse zone, floor mining-induced failure zone, faults, and collapse columns. From a safety perspective, these three aquifer groups cannot be used as target layers for mine water reinjection in production mines.

[0053] Table 2

[0054]

[0055] The mineralization of the mine water in the study area ranged from 1743.5 to 3664.3 mg / L, with an average of 2747.5 mg / L. It was mainly SO4-Na type water. Since TDS > 1000 mg / L is considered high mineralization mine water, the mine water was identified as high mineralization mine water.

[0056] Step S2: Investigate the geothermal development in the research area. The groundwater consumption of the geothermal reservoir is shown in Table 3, and the water quality characteristics are shown in Table 4.

[0057] Table 3

[0058]

[0059] The geothermal reservoirs in the study area that can be developed and utilized include the Neogene Minghuazhen Formation and Guantao Formation porous fracture geothermal reservoirs and the Paleozoic Ordovician limestone fracture karst geothermal reservoirs (referred to as Ordovician limestone geothermal reservoirs). Among them, the Neogene Minghuazhen Formation and Guantao Formation porous fracture geothermal reservoirs are currently in the exploration stage and have not yet been developed and utilized, with the groundwater level remaining dynamically balanced. Ordovician limestone geothermal resources have already been developed on a large scale and continuously, with deep hot water reaching 50℃. However, due to unreasonable and uneven development, the water level has continued to decline, making the need for recharge urgent.

[0060] Table 4

[0061]

[0062] The mineralization of the primary groundwater in the limestone area ranged from 1639.6 to 3926.8 mg / L, with an average of 3323.3 mg / L. The water quality type was SO4-Na·Ca type, and the primary groundwater in the limestone was high-mineralized mine water.

[0063] Step S3: Based on the principles of water quality safety and mining safety, select target aquifers for recharge.

[0064] Based on the principle of water quality safety, the quality of mine water is compared with that of native groundwater in geothermal reservoirs, such as... Figure 2 As shown. The TDS of the mine water (2747.5 mg / L) is lower than that of the original groundwater from the Ordos limestone formation (3323.3 mg / L), indicating lower mineralization. Overall, the mine water quality is superior to that of the original groundwater from the Ordos limestone formation. Specifically, the Na... + HCO3 - It is higher than the original groundwater.

[0065] Furthermore, in order to analyze whether the reinjection of mine water will have a negative impact on the groundwater of the Ordovician limestone geothermal reservoir, this case study uses PHREEQC software and the MIX module to simulate the water quality evolution after the mixing of mine water and Ordovician limestone water. The mixing ratios of mine water and Ordovician limestone water were set to 9:1, 7:3, 5:5, 3:7, and 1:9, and the temperature was set to 50℃. The saturation index SI, which is most prone to crystallization and precipitation in water, was calculated. The calculation results are shown in Table 5.

[0066] Table 5

[0067]

[0068] When the saturation index (SI) of a mineral is within ±0.5, it is considered to be in a relatively equilibrium state. When it is greater than 0.5, the mineral is considered to have a tendency to precipitate, and vice versa. PHREEQC calculations show that calcite is in a relatively equilibrium state, while the dissolution tendency of dolomite, gypsum, and anhydrite increases with the increase of the proportion of mine water. Therefore, overall, mine water reinjection reduces the precipitation tendency of calcite, dolomite, gypsum, and anhydrite, and enhances the dissolution tendency, thus meeting the safety principle of deep well ex-situ reinjection water quality.

[0069] Based on the principle of safe mining, the limestone thermal reservoir has a water inflow intensity level of Class II for the mine, which meets the principle of safe mining.

[0070] Based on the above analysis, the ex-situ reinjection of mine water into the Ordovician limestone geothermal reservoir satisfies both water quality safety and mining safety, and is therefore proposed as a suitable target layer for mine water reinjection.

[0071] Step S4: Establish a three-dimensional groundwater numerical model. Through simulation, obtain the correlation between the maximum water level rise and the recharge volume, the number of recharge boreholes, and the spacing between recharge boreholes, and formulate different recharge schemes. Based on the collected borehole data of the study area, a three-dimensional groundwater numerical model is established using GMS (Ground Model Systems) software. Combined with field recharge tests, parameter values ​​are assigned to the model, and fitting corrections are performed. The fitting effect between the data and the field recharge tests is as follows: Figure 3 As shown in Table 6, a reinjection scheme is designed under economical conditions, i.e., no pressure or low pressure (<0.5MPa). The simulation should include the following:

[0072] (1) The effect of different recharge flow rates on the groundwater flow field of the target aquifer under fixed spacing of multi-hole / single-hole recharge;

[0073] (2) Under the condition of fixed flow rate recharge through multiple wells, the impact of different control spacings on the groundwater flow field of the target aquifer was investigated. The above recharge schemes were evaluated and optimized. Simulation results are as follows: Figure 4 and Figure 5 As shown.

[0074] Table 6

[0075]

[0076] Based on the simulation results above, a multiple linear regression was performed with the maximum water level rise as the dependent variable and the recharge volume, the number of recharge holes, and the spacing between recharge holes as independent variables, resulting in Equation 1.

[0077] y=0.06869x1-7.43639x2-0.00273x3 (1)

[0078] In the formula, x1 is the reinjection volume, m 3 / h; x2 is the number of recharge holes, in holes; x3 is the spacing between recharge holes, in meters.

[0079] Step S5: Under long-term reinjection conditions, with a water filling intensity not exceeding Class III as the safety limit for mining, the economic indicators of reinjection are locally optimized. The water filling intensity of different reinjection schemes is evaluated to determine the optimal reinjection scheme. The water filling intensity evaluation process is as follows:

[0080] (1) Estimate the maximum water level rise and analyze the factors that may cause sudden water flow disasters due to the water level rise;

[0081] Using empirical formulas, theoretical calculations, and numerical simulations, we predict the maximum water level rise of the target aquifer during long-term recharge. We analyze the hydrogeological structure of the mine to determine the possible water-conducting channels, faults, mining-induced fractures, collapse columns, and poorly sealed boreholes that may be connected after the water level rise of the target aquifer during mine water recharge.

[0082] (2) Assess whether the relationship between the water source and the water channel and the water intensity have changed, and predict the potential water inrush induced by reinjection. Calculate whether the water channel can be directly connected and participate in the formation of mine water after being affected by the maximum water level generated by reinjection, based on relevant national regulations and laws. If not, the water intensity can be maintained at Class II; if it is, it can be upgraded to Class III or above.

[0083] In this embodiment, based on the analysis of the mine's hydrogeological structure, the Ordovician limestone aquifer is most likely to connect to the mining space through faults, causing water inrush disasters. Therefore, this embodiment uses the calculation formula for the lateral water-proof coal (rock) pillar leaving size specified in the "Detailed Rules for Water Prevention and Control in Coal Mines" to calculate the critical maximum water pressure after deformation.

[0084]

[0085] In the formula, L is the width of the coal pillar, which is 150m; K is the safety factor, generally taken as 2-5, and 5 is used in this calculation; M is the coal seam thickness or mining height, taken as 5.00m; Kp is the tensile strength of the coal, taken as 0.30MPa. The calculated critical maximum water pressure is 14.4MPa. The initial groundwater pressure at the top of the aquifer in the study area is 12MPa.

[0086] Since this involves engineering applications, economic feasibility must be considered. Therefore, while meeting the safety mining red line, the following constraints should be referenced to maximize engineering benefits. Table 7 shows the reference values ​​for economic indicators in this embodiment.

[0087] Table 7

[0088] index unit Water treatment cost reduction / ton 0.0011 million yuan Drilling cost / well 7.5 million yuan Maintenance and repair costs per month 0.5 million yuan Daily management costs / month 0.2 million yuan Design Recharge Period 10 years

[0089] Note: Equipment should be inspected and recharge suspended during two months each year.

[0090] The following is the formula for the economic indicators in this embodiment:

[0091] F = 79.2x1 - 750x2 - 60x2 - 0.2x2x3

[0092] Table 8 shows the results of local optimization of the economic efficiency of recharge and the calculation of the red line of safety indicators.

[0093] Table 8

[0094]

[0095] The above calculation results show that Scheme E (four-hole recharge, total recharge volume 800m³) is suitable. 3 The optimal reinjection scheme achieves the highest economic benefits under the critical maximum water pressure condition that meets the safety mining red line ( / h, 400m spacing).

[0096] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A method for resource-based water conservation and restoration of deep mine water with high salinity through in-situ reinjection, characterized in that, Includes the following steps: Step S1: Collect basic data on the formation mechanism and hydrochemical characteristics of mine water in the study area, analyze the hydrogeological structure of mine water inflow, and clarify the mine water inflow source, inflow channel, inflow intensity and hydrochemical characteristics. Step S2: Investigate the geothermal development in the region and clarify the groundwater consumption and water quality characteristics of each aquifer geothermal layer; Step S3: Based on the principles of water quality safety and mining safety, select target aquifers for recharge; Step S4: Establish a three-dimensional groundwater numerical model, and obtain the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes through simulation, so as to form different recharge schemes; Step S5: Under long-term reinjection conditions, taking mining safety as the red line and using the economic indicators of reinjection for local optimization, evaluate the water filling intensity of different reinjection schemes and determine the optimal reinjection scheme.

2. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S3, the method for determining water quality safety is as follows: (1) Compare the water quality of mine water with that of geothermal reservoir water. The water quality of mine water should be better than that of geothermal reservoir water. (2) The indoor water-water mixing test, water-rock interaction test, on-site water quality monitoring and PHREEQC numerical simulation method were used to analyze whether mine water recharge would deteriorate the groundwater quality.

3. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S3, the method for determining mining safety is as follows: the water filling intensity of the target aquifer to the mine excavation space is not higher than the Class II water filling intensity. The Class II water filling intensity refers to the aquifer having a water-rich content of medium or higher, but being only indirectly connected to the underground excavation space through interlayer crossflow, without a direct water-conducting channel, and not participating in the formation of mine water.

4. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S4, the method for constructing the three-dimensional groundwater numerical model is as follows: based on borehole data, a three-dimensional aquifer geological model is established using GMS, and hydrogeological parameters are assigned values ​​based on measured data. After fitting and verification, the three-dimensional groundwater numerical model is obtained.

5. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S4, the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes is obtained through simulation. Specifically, the simulation results are fitted with the recharge volume, the number of recharge holes, and the spacing between recharge holes as independent variables and the maximum water level rise as the dependent variable to obtain the correlation between the maximum water level rise and the recharge volume, the number of recharge holes, and the spacing between recharge holes. The relationship is as follows: y = f1x1 + f2x2 + f3x3, In the formula, y is the maximum rise in water level, x1 is the recharge amount, f1 is the weighting coefficient of the recharge amount; x2 is the number of recharge holes, f2 is the weighting coefficient of the number of recharge holes; x3 is the spacing between recharge holes, f3 is the weighting coefficient of the spacing between recharge holes.

6. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S4, the simulation specifically includes: (1) Simulate the effect of different recharge flow rates on the groundwater flow field of the target aquifer under the condition of fixed spacing of multi-hole recharge; (2) The influence of different control spacing on the groundwater flow field of the target aquifer under simulated fixed flow rate of multi-pore recharge.

7. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S5, the economic indicators F include drilling costs, subsequent management costs, reinjection water treatment costs, and cost savings compared to current water treatment methods for mine water reinjection. F=f w (x1)-f p (x2)-f m (x2,x3) Among them, f w (x1)=(c cost- Fill-c cost- (original) x1, f m (x2,x3)=c inspect x2+c management x2x3; In the formula, f w Saves costs for mine water reinjection; p For drilling costs; f m For subsequent management costs; c cost-灌 c is the unit cost of mine water reinjection; cost-原 The unit cost of existing mine water treatment; h is the depth of the reinjection well; c cost-井 The cost of constructing a reinjection well per unit depth; c inspect To maintain and repair costs; c management The cost is the daily operation and maintenance cost; the economic indicator F is the cost of mine water reinjection minus the well construction cost and subsequent management cost.

8. The method for resource-based water conservation and restoration of deep mine water with high salinity according to claim 1, characterized in that, In step S5, the evaluation of the water filling intensity for different reinjection schemes specifically involves: (1) Estimate the maximum water level rise and analyze the factors that may cause sudden water flow disasters due to the water level rise; (2) Assess whether the relationship between the water source and the water channel and the water intensity have changed, and predict the potential water inrush induced by the recharge.

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