Water pollution identification method and device, electronic equipment and storage medium

Abstract

The invention provides a water pollution identification method and device, electronic equipment and a storage medium, and relates to the technical field of pollution identification. The method comprises the following steps: respectively detecting concentration indexes of preset tracers in fracturing water and unpolluted water; when the concentration index of the fracturing water and the concentration index of the unpolluted water meet a preset difference condition, determining the concentration index of a preset tracer agent in preset mixed water; according to the hydrogeochemical model, simulating a concentration index of a preset tracer agent after the hydrogeochemical process, and when a difference value between the concentration index after the hydrogeochemical process and a concentration index corresponding to preset mixed water is smaller than a preset threshold value, taking the preset tracer agent as a sensitive tracer agent; and detecting the concentration index of the sensitive tracer agent in the water to be detected, and obtaining a pollution identification result according to the corresponding concentration index. According to the method, the sensitive tracer suitable for the characteristics of the target area is determined, so that the accuracy of pollution identification according to the concentration index of the sensitive tracer is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of pollution identification, and in particular to a water pollution identification method, device, electronic equipment and storage medium. Background Art

[0002] With the continuous growth of energy demand, the development and utilization of unconventional natural gas resources such as tight sandstone gas, shale gas, and coalbed methane have become increasingly important and urgent. The emergence of hydraulic fracturing technology has significantly changed this situation. By injecting high-pressure liquid into the ground, it creates cracks in the rock, allowing previously difficult-to-extract natural gas to flow into the wellbore. This has made the extraction of these unconventional natural gas resources economically viable and provided a new and important pathway for energy supply.

[0003] However, due to the various chemical additives added during the fracturing fluid preparation process and the water-rock interaction between the fracturing fluid and the reservoir rock and fluids (formation water) during the fracturing process, the flowback fluid can contain a large amount of contaminants. These fluids can enter the underground freshwater aquifer through fractures or natural faults during the fracturing process, potentially contaminating the groundwater and posing a serious threat to the safety of groundwater resources. Therefore, accurately identifying groundwater contamination caused by hydraulic fracturing has become a pressing technical challenge. Summary of the Invention

[0004] The problem solved by the present invention is how to achieve accurate water pollution identification.

[0005] To solve the above problems, the present invention provides a water pollution identification method, comprising: Obtaining fracturing water and uncontaminated water in a target area, and detecting concentration indicators of preset tracers in the fracturing water and the uncontaminated water respectively; When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water meet a preset difference condition, determining the concentration index of the preset tracer in the preset mixed water; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; Simulating a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process according to a hydrogeochemical model pre-associated with the preset tracer, and using the preset tracer as a sensitive tracer when a difference between a concentration index corresponding to the preset mixed water after the hydrogeochemical process and a concentration index corresponding to the preset mixed water is less than a preset threshold; The concentration index of the sensitive tracer in the water to be detected in the target area is detected, and a pollution identification result of the water to be detected is obtained according to the concentration index corresponding to the water to be detected.

[0006] Optionally, the water pollution identification method further includes: When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water do not meet the preset difference condition, or when the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is greater than or equal to a preset threshold, the preset tracer is replaced and the process returns to the step of separately detecting the concentration index of the preset tracer in the fracturing water and the uncontaminated water until the sensitive tracer is obtained.

[0007] Optionally, before determining the concentration index of the preset tracer in the preset mixed water, the method further includes: Obtaining a first order of magnitude of a concentration index corresponding to the fracturing water and a second order of magnitude of a concentration index corresponding to the uncontaminated water; When the difference between the first order of magnitude and the second order of magnitude is greater than a preset order of magnitude, it indicates that the preset difference condition is satisfied.

[0008] Optionally, the hydrogeochemical model includes a mineral dissolution and precipitation model and an ion exchange model; and simulating the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process based on the hydrogeochemical model pre-associated with the preset tracer includes: Obtaining a first simulated concentration index of the preset tracer according to the concentration index corresponding to the preset mixed water and the mineral dissolution and precipitation model; Obtaining a second simulated concentration index of the preset tracer according to the concentration index corresponding to the preset mixed water and the ion exchange model; Based on the sum of the first simulated concentration index and the second simulated concentration index, a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is obtained.

[0009] Optionally, before obtaining the pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected, the method further includes: Obtaining statistical values ​​corresponding to concentration indicators of the sensitive tracer in a plurality of the uncontaminated waters in the target area; Based on the statistical value, a probability interval of the concentration index corresponding to the uncontaminated water is determined, and according to the maximum value of the probability interval and the hydrogeochemical model, a mixing ratio of the fracturing water and the uncontaminated water is determined to obtain a minimum contamination mixing ratio; wherein the probability interval includes a confidence interval.

[0010] Optionally, obtaining the pollution identification result of the water to be tested according to the concentration index corresponding to the water to be tested includes: determining a current mixing ratio of the fracturing water and the uncontaminated water in the water to be tested based on the hydrogeochemical model and a concentration index corresponding to the water to be tested; When the current mixing rate corresponding to the water to be detected is greater than the minimum pollution mixing rate, the pollution identification result is that pollution exists.

[0011] Optionally, after determining the current mixing ratio of the fracturing water and the uncontaminated water in the water to be tested, the method further includes: When the number of the determined current mixing rates corresponding to the water to be tested exceeds a preset number threshold, constructing a data set according to the determined concentration index and current mixing rate corresponding to each of the determined water to be tested; A mapping relationship model between the concentration index corresponding to the water to be detected and the current mixing ratio corresponding to the water to be detected is constructed based on the data set; wherein, the mapping relationship model is used to output the current mixing ratio corresponding to the water to be detected based on the input concentration index corresponding to the water to be detected.

[0012] In the present invention, by obtaining the fracturing water and uncontaminated water in the target area and detecting the concentration index of the preset tracer therein, a basic basis is provided for the subsequent water pollution identification. Clarifying the original concentration of the tracer in the two water samples of fracturing water and uncontaminated water helps to judge the initial situation of the preset tracer in the fracturing water and uncontaminated water, and provides an important data basis for the subsequent selection of sensitive tracers and the pollution identification of the water to be detected. When the concentration index of the fracturing water and the uncontaminated water meets the preset difference condition, it means that the initial difference corresponding to the concentration index of the preset tracer in the fracturing water and the uncontaminated water is large, which is conducive to ensuring the reliability of pollution identification based on the preset tracer. On this basis, the concentration index of the preset tracer in the preset mixed water is determined, and according to the hydrogeochemical model pre-associated with the preset tracer, the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is simulated, which is conducive to understanding the influence of the hydrogeochemical process on the concentration of the preset tracer. When the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is less than a preset threshold, it indicates that the hydrogeochemical process has a small impact on the concentration index of the preset tracer. In this case, using the preset tracer as a sensitive tracer is beneficial to ensuring the effectiveness and stability of the selected sensitive tracer in identifying water pollution under complex natural conditions, improving the accuracy and reliability of water pollution identification based on the sensitive tracer, and avoiding the impact of interference from the hydrogeochemical process on the accuracy of water pollution identification. Therefore, the present invention determines a sensitive tracer suitable for the characteristics of the target area. After detecting the concentration index of the sensitive tracer in the water to be detected in the acquired target area, the pollution identification result of the water to be detected can be obtained based on the concentration index corresponding to the water to be detected, which is beneficial to ensuring the accuracy, reliability, and pertinence of the pollution identification result.

[0013] The present invention also provides a water pollution identification device, comprising: The advantages of the water pollution identification device provided by the present invention and the water pollution identification method compared with the prior art are basically the same, and will not be repeated here.

[0014] The present invention also provides an electronic device, comprising a memory and a processor; The memory is used to store computer programs; The processor is configured to implement the water pollution identification method described above when executing the computer program.

[0015] The advantages of the electronic device provided by the present invention and the water pollution identification method compared with the prior art are basically the same, and will not be repeated here.

[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the water pollution identification method described above is implemented.

[0017] The advantages of the computer-readable storage medium provided by the present invention and the water pollution identification method compared with the prior art are basically the same and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the flow of a water pollution identification method according to an embodiment of the present invention; Figure 2 is a schematic diagram of a relationship curve according to an embodiment of the present invention; Figure 3 Schematic diagram of the structure of a water pollution identification device according to an embodiment of the present invention; Figure 4 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0021] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] like Figure 1 As shown, an embodiment of the present invention provides a water pollution identification method, comprising the following steps: S1: Obtain fracturing water and uncontaminated water in the target area, and detect the concentration index of the preset tracer in the fracturing water and the uncontaminated water respectively.

[0024] Specifically, the target area referred to in this embodiment represents a specific geographic area where water contamination identification is required (e.g., the waters surrounding an area where fracking technology is used for oil and gas extraction). The water within this area is potentially contaminated and is the target area of ​​the entire water contamination identification process. The fracking water referred to in this embodiment refers to the water used in hydraulic fracturing operations (e.g., fracturing fluid and flowback fluid) during oil and natural gas extraction. This water typically contains various chemicals and may contaminate surrounding water bodies. The uncontaminated water referred to in this embodiment refers to water collected from the target area and determined to be free of contamination related to fracking operations. The pre-selected tracer referred to in this embodiment refers to a pre-selected chemical element (e.g., strontium, chlorine, etc.), whose concentration changes in water can be used to indicate whether the water is contaminated. The concentration index referred to in this embodiment refers to the numerical value of the pre-selected tracer in water (e.g., the ion concentration or isotope ratio corresponding to the pre-selected tracer), which can be measured using specific detection methods and instruments. For example, assuming the target area is a water area surrounding a rock gas extraction site, a fracking water sample is obtained from the rock gas extraction site, while an uncontaminated water sample is also obtained within the target area. Strontium can be selected as a preset tracer, and the ion concentration and isotope ratio of strontium in fracturing water and uncontaminated water can be detected respectively.

[0025] S2: When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water meet a preset difference condition, determining the concentration index of the preset tracer in the preset mixed water; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio.

[0026] Specifically, the preset difference condition referred to in this embodiment can be set in advance and serves as a criterion for determining the degree of difference between the concentration indicators of a preset tracer in fracking water and uncontaminated water. For example, the preset difference condition can be that the difference in ion concentration between the two is greater than a preset difference threshold. The preset mixed water referred to in this embodiment refers to fracking water and uncontaminated water mixed at a preset mixing ratio (i.e., the proportion of fracking water mixed into the uncontaminated water). The fracking water and uncontaminated water can be mixed at the preset mixing ratio to obtain a sample of the preset mixed water, and the concentration indicator of the preset tracer in the preset mixed water sample can be measured. Alternatively, the concentration indicator of the preset tracer in the fracking water and uncontaminated water mixed at the preset mixing ratio can be estimated based on a conservative mixing model included in existing hydrogeochemical models.

[0027] In one embodiment, the conservative mixing model satisfies: ; ; in, Indicates the ion concentration corresponding to the preset tracer in the preset mixed water; Indicates the ion concentration corresponding to the preset tracer in the fracturing water; represents the ion concentration corresponding to the preset tracer in uncontaminated water; R represents the mixing ratio (in this embodiment, R represents the preset mixing ratio); Indicates the isotope ratio corresponding to the preset tracer in the preset mixed water (e.g. 87 Sr / 86 Sr); Indicates the isotope ratio corresponding to the preset tracer in fracturing water; Indicates the isotope ratio corresponding to the preset tracer in uncontaminated water.

[0028] S3: According to the hydrogeochemical model pre-associated with the preset tracer, the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is simulated; when the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is less than a preset threshold, the preset tracer is used as a sensitive tracer.

[0029] Specifically, the hydrogeochemical model referred to in this embodiment refers to a model established based on hydrogeochemical principles. This model can consider the impact of various hydrogeochemical processes, such as chemical reactions and material exchange, on the concentration of substances in water (for example, the hydrogeochemical model in this embodiment can include existing ion exchange models). By inputting relevant parameters such as a preset mixed water, the concentration changes of a preset tracer in the preset mixed water after undergoing a series of hydrogeochemical processes under natural conditions can be simulated, thereby obtaining a corresponding concentration index. The preset threshold value referred to in this embodiment represents a pre-set allowable concentration difference range, which is used to determine whether the difference in concentration index before and after the hydrogeochemical process is within an acceptable range.

[0030] In one embodiment, after obtaining a concentration index corresponding to a predetermined mixed water (referred to as the first index for ease of understanding and description) and a concentration index corresponding to the predetermined mixed water after undergoing a hydrogeochemical process (referred to as the second index for ease of understanding and description), the difference between the first index and the second index (e.g., the difference between the ion concentration corresponding to the first index and the ion concentration corresponding to the second index) can be determined. When the difference between the first index and the second index is less than a preset threshold, the predetermined tracer can be used as a sensitive tracer. In this embodiment, the preset threshold can be determined based on the first index. For example, the preset threshold can be 5% of the first index. When the difference between the first index and the second index is less than 5% of the first index, the predetermined tracer can be used as a sensitive tracer.

[0031] S4: Detecting the concentration index of the sensitive tracer in the water to be detected in the acquired target area, and obtaining a pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected.

[0032] Specifically, the water to be tested in this embodiment refers to a water sample collected from a target area and requiring testing for contamination. A concentration index of a sensitive tracer in the water to be tested can be measured, and contamination identification results for the water to be tested can be obtained based on the concentration index corresponding to the water to be tested. For example, a concentration index corresponding to a minimum contamination level can be set in advance. When the concentration index corresponding to the water to be tested (e.g., the ion concentration corresponding to the sensitive tracer) is greater than the concentration index corresponding to the minimum contamination level, the water to be tested can be identified as contaminated.

[0033] In this embodiment, by obtaining fracking water and uncontaminated water in the target area and detecting the concentration index of the preset tracer therein, a basic basis is provided for subsequent water contamination identification. Clarifying the original concentration of the tracer in both the fracking water and uncontaminated water samples helps to determine the initial conditions of the preset tracer in the fracking water and uncontaminated water, providing an important data basis for the subsequent selection of sensitive tracers and the identification of contamination in the water to be tested. When the concentration index of the fracking water and the uncontaminated water meets the preset difference condition, it indicates that the initial difference corresponding to the concentration index of the preset tracer in the fracking water and the uncontaminated water is large, which is conducive to ensuring the reliability of contamination identification based on the preset tracer. On this basis, the concentration index of the preset tracer in the preset mixed water is determined, and based on the hydrogeochemical model pre-associated with the preset tracer, the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is simulated, which is conducive to understanding the impact of the hydrogeochemical process on the concentration of the preset tracer. When the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is less than a preset threshold, it indicates that the hydrogeochemical process has a small impact on the concentration index of the preset tracer. In this case, using the preset tracer as a sensitive tracer is beneficial for ensuring the effectiveness and stability of the selected sensitive tracer in identifying water pollution under complex natural conditions, improving the accuracy and reliability of water pollution identification based on the sensitive tracer, and avoiding the impact of interference from the hydrogeochemical process on the accuracy of water pollution identification. Therefore, this embodiment determines a sensitive tracer suitable for the characteristics of the target area. After detecting the concentration index of the sensitive tracer in the water to be tested within the acquired target area, the pollution identification result of the water to be tested can be obtained based on the concentration index corresponding to the water to be tested, which is beneficial for ensuring the accuracy, reliability, and pertinence of the pollution identification result.

[0034] Optionally, the water pollution identification method further includes the following steps: When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water do not meet the preset difference condition, or when the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is greater than or equal to the preset threshold, the preset tracer is replaced and the process returns to the step of separately detecting the concentration index of the preset tracer in the fracturing water and the uncontaminated water until a sensitive tracer is obtained.

[0035] In this embodiment, when the concentration index corresponding to the fracking water and the concentration index corresponding to the uncontaminated water do not meet the preset difference condition, it indicates that the concentration index of the preset tracer in the fracking water and the uncontaminated water in the target area is not significantly different, which means that the currently selected preset tracer may not be able to effectively distinguish between the two water bodies, making it difficult to accurately identify water contamination. If the difference between the concentration index corresponding to the preset mixed water after undergoing the hydrogeochemical process and the concentration index corresponding to the preset mixed water is greater than or equal to the preset threshold, it indicates that the currently selected preset tracer is insufficiently stable during geohydrological changes, is significantly affected by the natural environment, and cannot reliably reflect the true contamination status of the water body. In this case, another preset tracer is replaced and the process returns to the step of separately testing the concentration index of the preset tracer in the fracking water and the uncontaminated water. The reliability of the replaced preset tracer is reassessed until a sensitive tracer is obtained, which helps ensure the accuracy of subsequent contamination identification based on the sensitive tracer.

[0036] Optionally, before determining the concentration index of the preset tracer in the preset mixed water, the following steps are further included: Obtaining a first order of magnitude of a concentration index corresponding to fracturing water and a second order of magnitude of a concentration index corresponding to uncontaminated water; When the difference between the first order of magnitude and the second order of magnitude is greater than a preset order of magnitude, it indicates that a preset difference condition is satisfied.

[0037] Specifically, the first and second orders of magnitude referred to in this embodiment are used to measure the magnitude of a concentration indicator (e.g., ion concentration) and can be determined based on the corresponding numerical value of the concentration indicator. For example, the strontium ion concentration in fracturing water is 78.04 mg / L, and its corresponding order of magnitude may be 2. On the other hand, the strontium ion concentration in uncontaminated water is 0.74 mg / L, and its corresponding order of magnitude may be -2. The difference between the first and second orders of magnitude is 4. When this difference is greater than a preset order of magnitude (e.g., 3), it indicates that the preset difference condition has been met.

[0038] In this embodiment, a first order of magnitude of the concentration index corresponding to the fracking water and a second order of magnitude of the concentration index corresponding to the uncontaminated water are obtained. Different orders of magnitude represent significant differences in concentration, which is beneficial for macroscopically understanding the significant differences in the concentration of the preset tracer in the fracking water and the uncontaminated water. On this basis, this embodiment uses the order of magnitude difference and the preset order of magnitude as a basis for judgment, providing a quantitative standard for whether the preset difference condition is met. When the difference between the first order of magnitude and the second order of magnitude is greater than the preset order of magnitude, it indicates that the concentration index of the preset tracer in the fracking water and the uncontaminated water is significantly different, indicating that the preset difference condition is met. This rapid judgment based on order of magnitude is beneficial for quickly excluding preset tracers whose concentration difference in the two water bodies is not significant, improving the rationality and reliability of the selection of sensitive tracers, and thus ensuring the accuracy of the pollution identification results.

[0039] Optionally, the hydrogeochemical model includes a mineral dissolution and precipitation model and an ion exchange model; based on the hydrogeochemical model pre-associated with the preset tracer, the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is simulated, including: Obtaining a first simulated concentration index of a preset tracer according to a concentration index corresponding to the preset mixed water and a mineral dissolution and precipitation model; Obtaining a second simulated concentration index of a preset tracer according to a concentration index corresponding to the preset mixed water and an ion exchange model; Based on the sum of the first simulated concentration index and the second simulated concentration index, a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is obtained.

[0040] Specifically, the hydrogeochemical models referred to in this embodiment include a mineral dissolution and precipitation model and an ion exchange model. The mineral dissolution and precipitation model is used to describe and predict the dissolution and precipitation reactions between minerals in water and surrounding aquifer media (such as rock) during hydrogeochemical processes, as well as the impact of these reactions on the concentrations of various ions (including preset tracers) in the water. This model can simulate changes in the preset tracer concentration caused by the dissolution or precipitation of minerals under specific conditions. The mineral dissolution and precipitation model in this embodiment satisfies the following requirements: ; in, Indicates the isotope ratio corresponding to the preset tracer in the preset mixed water after mineral dissolution and precipitation; Indicates the isotope ratio corresponding to the preset tracer in the aquifer medium; Indicates the corresponding dissolution or precipitation amount of the preset tracer after the mineral dissolution and precipitation process. Among them, based on the above conservative mixing model, the existing saturation index SI can be used to determine the activity product of the corresponding ions of the preset tracer during the mineral dissolution and precipitation process, and the dissolution or precipitation amount of the preset tracer can be obtained according to the activity product, thereby obtaining It should be understood that in this embodiment, the saturation index SI is used to determine the activity product of the corresponding ions of the preset tracer during the mineral dissolution and precipitation process, and the activity product is obtained based on the activity product. The method is prior art and will not be described in detail here.

[0041] In one embodiment, the ion exchange model is primarily used to describe the exchange process between ions corresponding to a predetermined tracer in a predetermined mixed water and ions adsorbed on the surfaces of solid particles (e.g., the surface of an aquifer medium) during hydrogeochemical processes. This model can predict changes in the concentration of the predetermined tracer in water under this ion exchange. In this embodiment, the ion exchange model satisfies the following conditions: ; in, Indicates the isotope ratio corresponding to the preset tracer after the preset mixed water and the aquifer medium (such as rock formation) undergo an ion exchange process; It represents the concentration change of the preset tracer after the aquifer medium and the preset mixed water undergo the ion exchange process (i.e., the ion exchange amount). The ion exchange capacity can be determined based on the existing ion exchange equilibrium equation (such as the selectivity coefficient equation, etc.), thus obtaining It should be understood that in this embodiment, the ion exchange equilibrium equation is used to determine the ion exchange capacity, thereby obtaining The method is prior art and will not be described in detail here.

[0042] In this embodiment, during the hydrogeochemical process, the dissolution of minerals may release or absorb tracers, thereby changing the concentration index of the preset tracer in the preset mixed water. The exchange of ions corresponding to the preset tracer with other ions on the mineral surface or in the solution will also cause changes in the concentration index corresponding to the preset tracer in the preset mixed water. The hydrogeochemical model in this embodiment includes a mineral dissolution and precipitation model and an ion exchange model, which covers the comprehensive effects of various natural environmental factors on the concentration index corresponding to the preset tracer, and is conducive to more accurately simulating the concentration changes of the preset tracer after undergoing the hydrogeochemical process in the natural environment. In this way, this embodiment can obtain the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process based on the sum of the first simulated concentration index and the second simulated concentration index, which is conducive to improving the accuracy of the simulation results.

[0043] Optionally, before obtaining the pollution identification result of the water to be tested according to the concentration index corresponding to the water to be tested, the following steps are also included: Obtain statistical values ​​corresponding to concentration indicators of multiple sensitive tracers in uncontaminated water within the target area; The probability interval of the concentration index corresponding to the uncontaminated water is determined based on the statistical value, and the mixing ratio of the fracturing water and the uncontaminated water is determined according to the maximum value of the probability interval and the hydrogeochemical model to obtain the minimum contamination mixing ratio; wherein the probability interval includes the confidence interval.

[0044] Specifically, in this embodiment, uncontaminated water can be sampled at multiple locations within a target area to obtain multiple uncontaminated water samples. Based on this, concentration indicators of sensitive tracers (such as the ion concentration and isotope ratio corresponding to sensitive ions) can be measured in each uncontaminated water sample, and statistical values ​​corresponding to the multiple concentration indicators (such as the mean, median, standard deviation, etc.) can be determined.

[0045] In one embodiment, a probability interval can be determined based on a statistical value, with a certain degree of confidence in the probability of the presence of a sensitive tracer concentration indicator in uncontaminated water within the probability interval. The probability interval can include a confidence interval. For example, assuming that the statistical value in this embodiment includes the mean and standard deviation corresponding to the concentration indicator, the difference between the mean and three times the standard deviation can be used as the minimum value of the confidence interval, and the sum of the mean and three times the standard deviation can be used as the maximum value of the confidence interval. Based on this, the mixing ratio of the fracturing water and uncontaminated water can be inferred based on the maximum value of the probability interval and the hydrogeochemical model. For example, to simplify the processing process, this embodiment can determine the mixing ratio of the fracturing water and uncontaminated water based solely on the conservative mixing model included in the aforementioned hydrogeochemical model. Specifically, the maximum ion concentration is selected from the probability interval corresponding to the ion concentration of the preset tracer in the preset mixed water, and the maximum isotope ratio is selected from the probability interval corresponding to the isotope ratio of the preset tracer in the preset mixed water. The maximum ion concentration and the maximum isotope ratio are used as inputs to the conservative mixing model to output the current mixing ratio, which is then used as the minimum contaminated mixing ratio.

[0046] In this embodiment, statistical values ​​of sensitive tracer concentration indicators for multiple samples of uncontaminated water within the target area are obtained, and probability intervals (e.g., confidence intervals) are determined based on these values. This helps to understand the concentration fluctuations of the sensitive tracer in the uncontaminated water and more accurately reflects the corresponding fluctuation range of the sensitive tracer concentration indicator in the uncontaminated water. Furthermore, the mixing ratio of fracturing water and uncontaminated water is determined based on the maximum value of the probability interval and a hydrogeochemical model. This helps to assess the minimum level of contamination that the sensitive tracer can identify, thereby determining the minimum contamination mixing ratio. This provides a foundation for subsequent contamination detection using the sensitive tracer and ensures the reliability of the contamination detection results.

[0047] Optionally, obtaining a pollution identification result of the water to be tested according to a concentration index corresponding to the water to be tested includes: Determine the current mixing ratio of fracturing water and uncontaminated water in the water to be tested based on the hydrogeochemical model and the corresponding concentration index of the water to be tested; When the current mixing rate corresponding to the water to be detected is greater than the minimum pollution mixing rate, the pollution identification result is that pollution exists.

[0048] Specifically, when the present embodiment is actually conducting water pollution detection, the concentration index of the sensitive tracer in the water to be detected can be obtained, and based on the hydrogeochemical model and the concentration index corresponding to the water to be detected, the current mixing ratio of the fracturing water and the uncontaminated water in the water to be detected can be determined. Among them, the method for determining the current mixing ratio in the present embodiment is basically the same as the method for determining the minimum pollution mixing ratio mentioned above, and will not be repeated here. After determining the current mixing ratio, it can be determined whether the current mixing ratio is greater than the minimum pollution mixing ratio. If so, the pollution identification result is that the water to be detected is contaminated. If not, the pollution identification result is that the water to be detected is not contaminated.

[0049] In this embodiment, the current mixing ratio of fracking water and uncontaminated water is determined based on a hydrogeochemical model and the concentration index of the water to be tested, facilitating the precise quantification of the proportion of fracking water mixed into the source water. Furthermore, by determining whether the current mixing ratio of the water to be tested is greater than the minimum contamination mixing ratio, it is indirectly determined whether the concentration index of the sensitive tracer in the water to be tested exceeds the maximum value of the probability interval corresponding to the concentration index of the sensitive tracer in uncontaminated water. This method can thus identify whether the water to be tested is contaminated, providing an objective and accurate basis for water contamination identification and enabling efficient and accurate contamination detection of the water to be tested within the target area.

[0050] Optionally, after determining the current mixing ratio of fracturing water and uncontaminated water in the water to be tested, the method further includes the following steps: When the number of the determined current mixing rates exceeds a preset number threshold, a data set is constructed according to the determined concentration index and current mixing rate corresponding to each water to be tested; Based on the data set, a mapping relationship model is constructed between the concentration index corresponding to the water to be tested and the current mixing ratio corresponding to the water to be tested; wherein the mapping relationship model is used to output the current mixing ratio corresponding to the water to be tested based on the input concentration index corresponding to the water to be tested.

[0051] Specifically, the preset quantity threshold referred to in this embodiment can be set in advance to ensure that the number of determined current mixing ratios can meet the requirements for constructing a data set and a mapping relationship model. When the number of determined current mixing ratios exceeds the preset quantity threshold, a data set can be constructed based on the determined concentration index and current mixing ratio corresponding to each water to be tested. For example, in this embodiment, the concentration index can include the ion concentration and isotope ratio of the sensitive tracer. The ion concentration and isotope ratio of the sensitive tracer in each water to be tested can be associated with the corresponding current mixing ratio to obtain a data set. On this basis, a mapping relationship model can be constructed based on the data set between the concentration index corresponding to the water to be tested and the current mixing ratio corresponding to the water to be tested (such as using the data set to train an existing neural network model to obtain a mapping relationship model). In the subsequent process of contamination detection of the water to be tested, after detecting the concentration index corresponding to the water to be tested, it is input into the mapping relationship model, and the current mixing ratio corresponding to the water to be tested can be output, which is conducive to improving the efficiency of determining the current mixing ratio.

[0052] Optionally, in this embodiment, a relationship curve can be constructed based on the dataset, comparing the ion concentration and isotope ratio of the sensitive tracer with the corresponding current mixing ratio, thereby obtaining a mapping relationship model. To further improve the reliability of the mapping relationship model, this embodiment can simultaneously detect the ion concentration corresponding to conservative chemical elements (such as chlorine) that are essentially non-precipitating when detecting the concentration index of the sensitive tracer in the water to be tested. The ion concentration of each conservative chemical element and the isotope ratio of the sensitive tracer in the water to be tested are then correlated with the current mixing ratio. On this basis, the concentration indexes corresponding to multiple sensitive ions in the fracturing water and their corresponding means (referred to as the first mean for ease of understanding and description), as well as the concentration indexes of multiple sensitive tracers in uncontaminated water and their corresponding means (referred to as the second mean for ease of understanding and description), can be obtained, thereby constructing a mapping relationship curve based on the dataset, the first mean, and the second mean.

[0053] In one embodiment, the relationship curve is as follows: Figure 2 As shown, Figure 2 Where L1 represents fracturing water, L2 represents uncontaminated water, R represents the mixing ratio (in this embodiment, R represents the current mixing ratio), P1 represents the first mean, P2 represents the second mean, Sr (mg / L) represents the ion concentration of strontium, represents the isotope ratio of strontium, and Cl (mg / L) represents the ion concentration of chlorine. G1 represents the first relationship curve between the ion concentration of strontium, the isotope ratio of strontium, and the current mixing ratio. G2 represents the second relationship curve between the ion concentration of chlorine, the isotope ratio of strontium, and the current mixing ratio. During subsequent contamination identification of the test water, the ion concentration of strontium, the isotope ratio of strontium, and the ion concentration of chlorine in the test water can be measured. Based on this, the R value (referred to as the first mixing ratio for ease of understanding and presentation) can be determined based on the ion concentration of strontium, the isotope ratio of strontium, and the first relationship curve. Simultaneously, the R value (referred to as the second mixing ratio for ease of understanding and presentation) can be determined based on the ion concentration of chlorine, the isotope ratio of strontium, and the second relationship curve. The first and second mixing ratios are determined to meet a preset confidence condition (e.g., the difference between the two is less than a preset difference threshold). If so, the first mixing ratio is output as the current mixing ratio. If not, the water to be tested is resampled and the process returns to testing the strontium ion concentration, strontium isotope ratio, and chlorine ion concentration in the water to be tested, until the preset credibility conditions are met. This facilitates cross-validation of the simulated mixing ratio results, preventing factors such as detection errors in the corresponding concentration indicators of sensitive tracers from affecting the accuracy and reliability of the current mixing ratio.

[0054] In this embodiment, setting a preset threshold helps ensure a sufficient number of samples for constructing the dataset. This provides a data foundation for the subsequent construction of a mapping model, enabling the model to better simulate the mapping relationship between concentration index and mixing ratio, thereby improving the accuracy of the current mixing ratio. After constructing the mapping model, simply inputting the concentration index of the water to be tested directly outputs the corresponding current mixing ratio, eliminating the need for complex calculations based on hydrogeochemical models. This ensures the accuracy of the current mixing ratio while effectively improving the efficiency of water pollution detection.

[0055] like Figure 3 As shown, an embodiment of the present invention provides a water pollution identification device 300, comprising: An acquisition module 310 is configured to acquire fracturing water and uncontaminated water in a target area, and to detect concentration indicators of a preset tracer in the fracturing water and the uncontaminated water, respectively; a determination module 320 configured to determine a concentration index of the preset tracer in a preset mixed water when a concentration index corresponding to the fracturing water and a concentration index corresponding to the uncontaminated water meet a preset difference condition; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; a simulation module 330 for simulating a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process based on a hydrogeochemical model pre-associated with the preset tracer, and using the preset tracer as a sensitive tracer when a difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is less than a preset threshold; The identification module 340 is configured to detect the concentration index of the sensitive tracer in the water to be detected in the target area, and obtain a pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected.

[0056] The water pollution identification device and the water pollution identification method provided in this embodiment can produce substantially the same technical effects, which will not be described in detail here.

[0057] like Figure 4 As shown, an electronic device 400 provided by an embodiment of the present invention includes a memory 410 and a processor 420; the memory 410 is used to store computer programs; the processor 420 is used to implement the water pollution identification method as described above when executing the computer program.

[0058] In other words, an electronic device 400 includes a memory 410 and a processor 420 coupled to the memory 410; the memory 410 is configured to store a computer program; and the processor 420 is configured to perform the following operations when executing the computer program: Obtaining fracturing water and uncontaminated water in a target area, and detecting concentration indicators of a preset tracer in the fracturing water and the uncontaminated water respectively; When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water meet a preset difference condition, determining the concentration index of the preset tracer in the preset mixed water; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; Simulating a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process according to a hydrogeochemical model pre-associated with the preset tracer, and using the preset tracer as a sensitive tracer when a difference between a concentration index corresponding to the preset mixed water after the hydrogeochemical process and a concentration index corresponding to the preset mixed water is less than a preset threshold; The concentration index of the sensitive tracer in the water to be detected in the target area is detected, and a pollution identification result of the water to be detected is obtained according to the concentration index corresponding to the water to be detected.

[0059] The electronic device and the water pollution identification method provided in this embodiment can produce substantially the same technical effects, which will not be described in detail here.

[0060] An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the water pollution identification method described above is implemented.

[0061] In other words, a non-volatile computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the following operations: Obtaining fracturing water and uncontaminated water in a target area, and detecting concentration indicators of a preset tracer in the fracturing water and the uncontaminated water respectively; When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water meet a preset difference condition, determining the concentration index of the preset tracer in the preset mixed water; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; Simulating a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process according to a hydrogeochemical model pre-associated with the preset tracer, and using the preset tracer as a sensitive tracer when a difference between a concentration index corresponding to the preset mixed water after the hydrogeochemical process and a concentration index corresponding to the preset mixed water is less than a preset threshold; The concentration index of the sensitive tracer in the water to be detected in the target area is detected, and a pollution identification result of the water to be detected is obtained according to the concentration index corresponding to the water to be detected.

[0062] The computer-readable storage medium provided in this embodiment can produce substantially the same technical effects as the water pollution identification method, and thus will not be described in detail here.

[0063] An electronic device 400 that can serve as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device 400 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device 400 can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0064] Electronic device 400 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). The RAM can also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. An input / output (I / O) interface is also connected to the bus.

[0065] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). In this application, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network elements. Some or all of these units can be selected based on actual needs to achieve the objectives of the embodiments of the present invention. Furthermore, the functional units in the various embodiments of the present invention can be integrated into a single processing unit, each unit can exist physically separately, or two or more units can be integrated into a single unit. These integrated units can be implemented in either hardware or software functional units.

[0066] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A water pollution identification method, characterized in that: include: Obtaining fracturing water and uncontaminated water in a target area, and detecting concentration indicators of preset tracers in the fracturing water and the uncontaminated water respectively; When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water meet a preset difference condition, determining the concentration index of the preset tracer in the preset mixed water; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; Simulating a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process according to a hydrogeochemical model pre-associated with the preset tracer, and using the preset tracer as a sensitive tracer when a difference between a concentration index corresponding to the preset mixed water after the hydrogeochemical process and a concentration index corresponding to the preset mixed water is less than a preset threshold; The concentration index of the sensitive tracer in the water to be detected in the target area is detected, and a pollution identification result of the water to be detected is obtained according to the concentration index corresponding to the water to be detected.

2. The water pollution identification method according to claim 1, characterized in that: Also includes: When the concentration index corresponding to the fracturing water and the concentration index corresponding to the uncontaminated water do not meet the preset difference condition, or when the difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is greater than or equal to a preset threshold, the preset tracer is replaced and the process returns to the step of separately detecting the concentration index of the preset tracer in the fracturing water and the uncontaminated water until the sensitive tracer is obtained.

3. The water pollution identification method according to claim 1, characterized in that: Before determining the concentration index of the preset tracer in the preset mixed water, the method further includes: Obtaining a first order of magnitude of a concentration index corresponding to the fracturing water and a second order of magnitude of a concentration index corresponding to the uncontaminated water; When the difference between the first order of magnitude and the second order of magnitude is greater than a preset order of magnitude, it indicates that the preset difference condition is satisfied.

4. The water pollution identification method according to claim 1, characterized in that: The hydrogeochemical model includes a mineral dissolution and precipitation model and an ion exchange model; the hydrogeochemical model pre-associated with the preset tracer simulates the concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process, including: Obtaining a first simulated concentration index of the preset tracer according to the concentration index corresponding to the preset mixed water and the mineral dissolution and precipitation model; Obtaining a second simulated concentration index of the preset tracer according to the concentration index corresponding to the preset mixed water and the ion exchange model; Based on the sum of the first simulated concentration index and the second simulated concentration index, a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process is obtained.

5. The water pollution identification method according to claim 1, characterized in that: Before obtaining the pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected, the method further includes: Obtaining statistical values ​​corresponding to concentration indicators of the sensitive tracer in a plurality of the uncontaminated waters in the target area; Based on the statistical value, a probability interval of the concentration index corresponding to the uncontaminated water is determined, and according to the maximum value of the probability interval and the hydrogeochemical model, a mixing ratio of the fracturing water and the uncontaminated water is determined to obtain a minimum contamination mixing ratio; wherein the probability interval includes a confidence interval.

6. The water pollution identification method according to claim 5, characterized in that: Obtaining the pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected includes: determining a current mixing ratio of the fracturing water and the uncontaminated water in the water to be tested based on the hydrogeochemical model and a concentration index corresponding to the water to be tested; When the current mixing rate corresponding to the water to be detected is greater than the minimum pollution mixing rate, the pollution identification result is that pollution exists.

7. The water pollution identification method according to claim 6, characterized in that: After determining the current mixing ratio of the fracturing water and the uncontaminated water in the water to be tested, the method further includes: When the number of the determined current mixing rates corresponding to the water to be tested exceeds a preset number threshold, constructing a data set according to the determined concentration index and current mixing rate corresponding to each of the determined water to be tested; A mapping relationship model between the concentration index corresponding to the water to be detected and the current mixing ratio corresponding to the water to be detected is constructed based on the data set; wherein, the mapping relationship model is used to output the current mixing ratio corresponding to the water to be detected based on the input concentration index corresponding to the water to be detected.

8. A water pollution identification device, characterized in that: include: an acquisition module, which is used to acquire fracturing water and uncontaminated water in a target area, and respectively detect concentration indicators of preset tracers in the fracturing water and the uncontaminated water; a determination module configured to determine a concentration index of the preset tracer in a preset mixed water when a concentration index corresponding to the fracturing water and a concentration index corresponding to the uncontaminated water meet a preset difference condition; wherein the preset mixed water represents the fracturing water and the uncontaminated water mixed at a preset mixing ratio; a simulation module configured to simulate, based on a hydrogeochemical model pre-associated with the preset tracer, a concentration index of the preset tracer in the preset mixed water after the hydrogeochemical process, and to use the preset tracer as a sensitive tracer when a difference between the concentration index corresponding to the preset mixed water after the hydrogeochemical process and the concentration index corresponding to the preset mixed water is less than a preset threshold; The identification module is used to detect the concentration index of the sensitive tracer in the water to be detected in the target area, and obtain the pollution identification result of the water to be detected according to the concentration index corresponding to the water to be detected.

9. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is configured to implement the water pollution identification method according to any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by the processor, the water pollution identification method according to any one of claims 1 to 7 is implemented.

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