CN-121978775-A - Hydrogeology fine exploration and water source quantitative tracing method for gobi desert mining area

CN121978775ACN 121978775 ACN121978775 ACN 121978775ACN-121978775-A

Abstract

The invention is suitable for the technical field of mine safety and water resource protection, and provides a method for hydrogeology fine exploration and water source quantitative tracing of a gobi desert mining area, which comprises the steps of multi-source data collaborative acquisition; the method has the beneficial effects that multi-source exploration soft and hard data are fused, the multi-resolution of a single exploration means is overcome, three-dimensional hydrogeology fine characterization is realized, and the traditional qualitative judgment is spanned to multi-end member accurate quantitative analysis by means of a multi-dimensional mass balance and nonlinear optimization algorithm, so that reliable support is provided for water hazard targeting prevention and control and water conservation exploitation in a desert mining area.

Inventors

YU KUNPENG
CHEN SHIQI
MA LIQIANG
WU YIHUI
ZHAO ZHIYANG
FAN LIMIN
WU YONGHUI

Assignees

中国矿业大学

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (7)

1. The method for hydrogeology fine exploration and water source quantitative tracing in the gobi desert mining area is characterized by comprising the following steps: The multi-source data collaborative acquisition step comprises the steps of acquiring large-scale geophysical exploration data, targeted drilling and in-situ hydrological test data of a target gobi desert mining area, and three-dimensional hydrological dynamic monitoring network data which cover mining area surface water, aquifer and mine water inflow points and comprise water level, water quantity and water chemistry basic indexes; collecting various representative water samples covering a full hydrologic cycle path in the target gobi desert mining area, wherein the representative water samples comprise target mixed water body water samples to be analyzed, carrying out cooperative testing on water chemistry ions and environmental isotopes on the representative water samples, revealing a main control geochemistry process and a replenishing condition by utilizing a water chemistry and isotope analysis chart, and constructing a water chemistry isotope fingerprint; Establishing a three-dimensional space simulation domain grid, fusing hard data converted from the targeted drilling and in-situ hydrographic test data and soft constraints converted from the large-scale geophysical exploration data by adopting a cooperative Kriging algorithm, constructing a high-precision space three-dimensional heterogeneous hydrogeological parameter field, establishing a three-dimensional transient groundwater flow model based on mass conservation and Darcy's law and the high-precision space three-dimensional heterogeneous hydrogeological parameter field, and outputting four-dimensional flow field evolution characteristics; and the end member mixed model construction and water source replenishment quantitative analysis step is to select characteristic parameters and independent replenishment end members which are in a conservative behavior based on the water chemistry isotope fingerprint spectrum, establish a multidimensional mass balance end member mixed model according to water conservation and tracer mass conservation, construct a nonlinear global optimization objective function, perform iterative optimization and solve the quantitative replenishment proportion of each independent replenishment end member in the target mixed water sample.
2. The method for hydrogeology fine exploration and water source quantitative tracing in the gobi desert mining area according to claim 1, wherein in the step of multi-source data collaborative collection, the following steps are adopted: The range geophysical exploration data are obtained through a ground transient electromagnetic method and high-precision three-dimensional seismic exploration, the targeted drilling and in-situ hydrological test data comprise lithology characteristics, water-bearing layer elevation positions and permeability coefficients, and the representative water sample at least comprises surface water, shallow fourth-system diving, main coal mining layer top and bottom plate bedrock fracture water and goaf presbyopia water.
3. The method for hydrogeology fine exploration and water source quantitative tracing in the gobi desert mining area according to claim 1, wherein the step of constructing the hydrochemistry and isotope fingerprint is characterized in that: The water chemistry and isotope analysis chart comprises a Peperot three-line chart, a Gibbs chart and an oxyhydrogen stable isotope relation chart, wherein the Peperot three-line chart is used for generating a water chemistry type fingerprint, the Gibbs chart is used for identifying a rock weathering and water rock interaction mechanism, and the oxyhydrogen stable isotope relation chart is used for judging the evaporation concentration degree and the updating rate of a water body by combining tritium isotope indexes.
4. The method for hydrogeology fine exploration and water source quantitative tracing of gobi desert mining area according to claim 1, characterized in that, in the three-dimensional geologic modeling and information fusion step, when the hard data and the soft constraint are fused by adopting a cooperative kriging algorithm, points to be estimated in a three-dimensional space simulation domain grid are aimed at Estimated value of permeability coefficient at Calculated by the following formula: ; In the formula, Is the first in the search field The hard data acquired at the actual measurement points, Is the first in the search field The soft constraint data extracted at the individual mesh nodes, 、 Weight coefficients of the hard data and the soft constraint data respectively, The hard data points and the soft constraint data points in the search ellipsoid are respectively.
5. The method for hydrogeology fine exploration and water source quantitative tracing of the gobi desert mining area according to claim 1, wherein in the three-dimensional geologic modeling and information fusion step, a partial differential control equation corresponding to the three-dimensional transient groundwater flow model is established as follows: ; In the formula, As a function of head as a function of space coordinates and time, The permeability coefficient tensors for the three principal directions respectively, Is a source sink item of a unit volume hydrological geologic body, For the water storage rate, Is a time variable.
6. The method for hydrogeology fine exploration and water source quantitative tracing of gobi desert mining area according to claim 1, characterized in that in the steps of end member mixed model construction and water source replenishment quantitative analysis, the established multi-dimensional mass balance end member mixed model and nonlinear global optimization objective function thereof consist of the following equation set, iterative optimization is carried out by adopting a sequential quadratic programming method in solving, and iteration is carried out until the norm of the objective function gradient is smaller than that of the objective function gradient Or stopping when the sum of squares of residuals is less than 5%: Conservation equation of water: ; Tracer mass conservation equation: ; Normalized nonlinear optimization objective function: ; In the formula, For the total number of said independent replenishment end members, To assist in the calculation of the total number of independent natural tracers, Is the first The volume percentage of the independent replenishment end members in the target mixed water sample, Is the first The first of the independent replenishment end members The concentration of the individual natural tracers, The first water sample in the target mixed water body The concentration of the individual natural tracers, Is the first In the water body of the individual end members, the first The total concentration of carrier elements corresponding to the isotope ratio, Is the first In the water body of the individual end members, the first The actual measurement value of the isotope ratio, In the mixed water body as the target Measured values of isotope ratios.
7. The method for hydrogeology fine exploration and water source quantitative tracing of gobi desert mining area according to claim 1, further comprising the steps of: Combining the four-dimensional flow field evolution characteristics with the quantitative replenishment proportion of each independent replenishment end member in the target mixed water sample, judging the position of a hydraulic connection channel for inducing water burst in a target gobi desert mining area, and dynamically updating the distribution of monitoring nodes of a three-dimensional hydrologic dynamic monitoring network based on the judgment result.

Description

Hydrogeology fine exploration and water source quantitative tracing method for gobi desert mining area Technical Field The invention belongs to the technical field of mine safety and water resource protection, and particularly relates to a method for hydrogeology fine exploration and water source quantitative tracing of a gobi desert mining area. Background The mine areas of the Gobi desert in the west of China generally have the characteristics of rare precipitation, strong evaporation, uneven spatial and temporal distribution of water resources, weak ecological restoration capacity and the like, and the underground water system is extremely sensitive to geological structure and mining disturbance. In the exploitation process of resources such as coal, the development of a water guide channel and a mining fracture is easy to change the hydraulic connection between water bearing layers, so that not only is the major water damage hidden trouble such as mine water burst, old water accumulation and the like easily induced, but also the continuous drop of the underground water level and regional ecological degradation are often caused. Therefore, accurately finding out the hydrogeologic structure of the mining area, finely probing and reliably analyzing the groundwater supply source and the contribution proportion thereof, and is a prerequisite for realizing the water-retaining coal mining and ecological protection of the desert mining area. The existing hydrogeology exploration means mainly depend on geophysical exploration, drilling and water pumping and injection tests or carry out routine analysis through basic hydrodynamics observation of water level, water quantity, water quality and the like. The traditional hydrogeology exploration and water source analysis method has the technical defects of single source data dispersion interpretation, and is characterized in that a single geophysical exploration method has strong non-uniqueness in inversion results under the condition of a medium with strong heterogeneity and complex formation, traditional drilling verification cost is high and discrete in distribution points, continuous and effective constraint is difficult to form on a large-scale three-dimensional space structure, meanwhile, when a complex mixed water gushing scene of a multi-aquifer water body caused by mining disturbance is faced, the traditional end member mixing model can only realize simple quantification of double end members, lacks a quantitative analysis mechanism for carrying out unified frame fusion on multi-modal data such as geophysical exploration, drilling and water chemistry isotopes, cannot systematically make clear supply-runoff-drainage relation, often can only stay in a qualitative discrimination level, so that calculation of the boundary of the aquifer and the end member supply contribution proportion of the mixed water body has extremely high uncertainty, and the reliable decision requirement of mine water hazard accurate prevention and control and water resource protection exploitation is difficult to be met. Disclosure of Invention The invention aims to provide a method for hydrogeology fine exploration and water source quantitative tracing in a gobi desert mining area, and aims to solve the problems in the background technology. The method comprises the steps of acquiring large-scale geophysical exploration data, targeted drilling and in-situ hydrological test data of a target gobi desert mining area, and covering surface water, aquifers and mine water gushes points of the mining area, wherein the three-dimensional hydrological dynamic monitoring network data comprises water level, water quantity and water chemistry basic indexes. Collecting various representative water samples covering a full hydrologic cycle path in the target gobi desert mining area, wherein the representative water samples comprise target mixed water body water samples to be analyzed, carrying out collaborative testing on water chemistry ions and environmental isotopes on the representative water samples, and utilizing a water chemistry and isotope analysis chart to reveal a main control geochemistry process and supply conditions so as to construct the water chemistry isotope fingerprint. Establishing a three-dimensional space simulation domain grid, fusing hard data converted from the targeted drilling and in-situ hydrographic test data and soft constraint converted from the large-range geophysical exploration data by adopting a cooperative Kriging algorithm, constructing a high-precision space three-dimensional heterogeneous hydrogeological parameter field, establishing a three-dimensional transient groundwater flow model based on mass conservation and Darcy's law and the high-precision space three-dimensional heterogeneous hydrogeological parameter field, and outputting four-dimensional flow field evolution characteristics. And the end member mixed model construction and water source replenishment qu