A method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits

Abstract

The present invention belongs to the field of uranium geological exploration, and specifically discloses a method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits, comprising: step S101, based on the analysis of structural deformation characteristics, the structural evolution of the structural layer where the uranium reservoir is located is restored; step S102, based on the plane structural map corresponding to each structural deformation period, the ancient burial depth, ancient inclination and ancient migration distance parameters of oxygen-containing uranium-containing water in the uranium reservoir in each geological historical period are obtained; step S103, based on the particle size analysis of the uranium reservoir, the Trask sorting coefficient is obtained; step S104, the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir is calculated, and the flow capacity of oxygen-containing uranium-containing water in each geological historical period is determined. The present invention can quantitatively evaluate the flow capacity of oxygen-containing uranium-containing water in the uranium mineralization historical period, so as to provide important parameters for evaluating the uranium mineralization potential and favorable area prediction of sandstone-type uranium deposits.

Description

Technical Field

[0001] The invention belongs to the field of uranium geological exploration, and in particular relates to a method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium ore. Background Art

[0002] Uranium resources are an important strategic resource. With the rapid development of nuclear power in my country, the demand for uranium resources continues to increase. Therefore, strengthening uranium exploration and development is very necessary to ensure and accelerate the development of nuclear power. Sandstone uranium deposits occupy an important position in the total amount of uranium resources in the world. In the past decade, with the continuous development of in-situ leaching uranium mining technology, the advantages of "low cost and low pollution" in the development of sandstone uranium deposits have become increasingly prominent. The focus of uranium exploration in my country has shifted to sandstone uranium deposits in large sedimentary basins, and it has become one of the important types of prospecting in my country. As a hydrogenic mineralization, the formation of sandstone uranium deposits is the result of water-rock interaction. The source, migration and enrichment of uranium are inseparable from the participation of groundwater. Among them, aquifers provide space for uranium enrichment and storage, groundwater circulation provides power for uranium migration in aquifers, and the redox environment of groundwater controls the hydrogeochemical process of transformation between uranium of different valence states. It can be seen that the formation of uranium ore is actually a process in which oxygen-containing uranium-containing water along the runoff direction causes uranium to be redistributed at the water-rock interface due to changes in groundwater redox conditions.

[0003] Generally speaking, during the uranium mineralization period, the greater the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir, the stronger the uranium mineralization and the greater the mineralization potential. Areas with large flow capacity coefficients of oxygen-containing uranium-containing water in uranium reservoirs during the uranium mineralization period are often favorable areas for uranium formation.

[0004] Therefore, for the favorable prediction of favorable areas of sandstone-type uranium deposits, providing a method for quantitatively, simply and accurately evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits is a technical problem that is urgently needed to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits, which can quantitatively evaluate the flow capacity of oxygen-containing uranium-containing water in the uranium mineralization history period, so as to provide important parameters for evaluating the uranium mineralization potential of sandstone-type uranium deposits and predicting favorable areas.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in a sandstone-type uranium ore, the method comprising the following steps:

[0008] Step S101, based on the analysis of structural deformation characteristics, the structural evolution of the structural layer where the uranium reservoir is located is restored;

[0009] Step S102, based on the planar structural map corresponding to each structural deformation period, obtaining the ancient burial depth, ancient dip angle and ancient migration distance parameters of oxygen-containing and uranium-containing water of the uranium reservoir in each geological historical period;

[0010] Step S103, obtaining the Trask sorting coefficient based on the uranium reservoir particle size analysis;

[0011] Step S104, calculating the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir, and determining the flow capacity of oxygen-containing uranium-containing water in each geological historical period.

[0012] The step S101 includes:

[0013] Step S11, identifying unconformity surface;

[0014] Step S12, dividing the structural layers;

[0015] Step S13, clarifying the basic structural style;

[0016] Step S14, determining the time of structural deformation in the structural pattern;

[0017] Step S15, restoring the profile structural evolution;

[0018] Step S16: Restoring the plane structure.

[0019] The step S14 specifically includes: collecting sandstone samples, mechanically crushing and then sorting apatite minerals, and then selecting apatite minerals with intact crystals under an electron microscope; using LA-ICP-MS to test the age of apatite fission tracks, and the age is the deformation time of the structure.

[0020] The step S15 specifically includes: selecting a seismic profile perpendicular to the direction of the deformed structure, and under the time constraint of the structural deformation, based on the structural background of the area where the deformed structure is located, using 2DMove software to perform structural restoration of the profile, and obtaining a structural profile corresponding to the time of each structural deformation.

[0021] The step S16 specifically includes: using Surfer software to image the structural cross-section diagram of each structural deformation time restored by using the seismic section into a plane structural diagram, that is, a plane structural diagram corresponding to each structural deformation period.

[0022] The step S102 includes:

[0023] Step S21: Based on the planar structural map of each structural deformation period, read the ancient burial depth H i ;

[0024] Step S22: Based on the elevation difference and horizontal distance of adjacent contour lines, calculate the paleo-inclination angle θ i ;

[0025] Step S23: Based on the planar structural diagram of each structural deformation period, calculate the ancient horizontal migration distance L of oxygen-containing and uranium-containing water i .

[0026] In step S22, the elevation difference and horizontal distance of adjacent contour lines are calculated according to the formula:

[0027]

[0028] Among them, H i Tg is the period of structural deformation i Ancient burial depth of contour lines in the planar structural map, m; H i+1 Tg is the period of structural deformation i The ancient burial depth of adjacent contour lines in the plane structure map, m; ΔL is the elevation difference between the burial depths of adjacent contour lines, m.

[0029] The step S103 includes:

[0030] Step S31, sample processing and testing;

[0031] Step S32: Determine the first quartile Q 1 and the third quartile Q 3 ;

[0032] Step S33, calculate Trask sorting coefficient S 0 .

[0033] In step S33, the Trask sorting coefficient S is calculated. 0 The formula is:

[0034] S 0 =(Q 1 / Q 3 ) / 2.

[0035] In step S104, the formula for calculating the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir is:

[0036]

[0037] R(t) is the flow capacity coefficient of oxygen- and uranium-containing water at time t, a dimensionless quantity; ρ w is the density of water, kg / m 3 ; g is the acceleration due to gravity, 9.8m / s 2 ; H is the burial depth, km; θ is the inclination angle of the uranium reservoir, °; is the porosity, %; L is the horizontal migration distance of oxygen-containing uranium-containing water, km; t is the geological history time, Ma; S 0 is the Trask sorting coefficient.

[0038] The beneficial technical effects of the present invention are:

[0039] 1. The present invention provides a method for evaluating the flowability of oxygen-containing uranium-containing water in sandstone-type uranium deposits. On the basis of tectonic evolution restoration, the flowability coefficient of oxygen-containing uranium-containing water is calculated according to the paleoparameters of oxygen-containing uranium-containing water and the Trask sorting coefficient, and the flowability of oxygen-containing uranium-containing water in various parts and periods of sandstone-type uranium deposit reservoirs is quantitatively evaluated. That is, the flowability of oxygen-containing uranium-containing water in the main mineralization period of sandstone-type uranium deposits can be quantitatively revealed only based on the flowability coefficient of oxygen-containing uranium-containing water, so as to provide important parameters for evaluating the uranium mineralization potential of sandstone-type uranium deposits and predicting favorable areas.

[0040] 2. The method provided by the present invention for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits is applicable to all sandstone-type uranium deposits, is not limited by the multi-stage tectonic evolution background, and is applicable to both early uranium exploration areas and late mature development areas.

[0041] 3. The present invention breaks through the previous qualitative evaluation of the flow capacity of oxygen-containing uranium-containing water based on the ancient structural background, and can quantitatively characterize the flow capacity of oxygen-containing uranium-containing water in uranium reservoirs, thereby having higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a method for evaluating the flow capacity of oxygen-containing and uranium-containing water in a sandstone-type uranium ore provided by the present invention;

[0043] Figure 2 A schematic diagram of the structural evolution restoration result (ancient burial depth map) provided by the present invention;

[0044] Figure 3 This is a schematic diagram of the paleo-inclination distribution of the uranium reservoir provided by the present invention.

[0045] Figure 4 This is a schematic diagram of the distribution of ancient horizontal migration distances of oxygen- and uranium-containing water in a uranium reservoir provided by the present invention.

[0046] Figure 5 The cumulative distribution curve of the particle size composition of a sandstone sample in the uranium reservoir provided by the present invention is shown in FIG.

[0047] Figure 6 This is a schematic diagram of the Trask sorting coefficient distribution of the uranium reservoir provided by the present invention.

[0048] Figure 7 A schematic diagram of the distribution of flow capacity coefficients of oxygen- and uranium-containing water in a uranium reservoir provided by the present invention. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0050] like Figure 1 As shown, this embodiment provides a method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits, which specifically includes the following steps:

[0051] Step S101: based on the analysis of structural deformation characteristics, the structural evolution of the structural layer where the uranium reservoir is located is restored.

[0052] Step S101 may specifically include the following steps:

[0053] Step S11, identifying unconformity surfaces: Based on field geological surveys, combined with seismic and drilling and logging data, focus on identifying regional unconformity surfaces, i.e., interfaces where strata are discontinuously distributed on seismic profiles and in drilling and logging data;

[0054] Step S12, dividing structural layers: there can be one to several regional unconformities, and the strata between two regional unconformities are divided into structural layers, and there can be one to several structural layers;

[0055] Step S13, clarifying the basic structural style: on the seismic profile, combined with the field geological profile, interpreting the folds and faults in each structural layer, each structural layer may have 0 to several folds and faults, and the morphology and superposition relationship of the folds and faults within each structural layer and between structural layers are the basic structural style;

[0056] Step S14, determining the time of structural deformation in the structural style: select a field profile or borehole that crosses the structural trend in the structural style, collect 1-2 sandstone samples in the structural layer, the sample mass is 2kg-3kg, mechanically crush to 40-60 mesh, and use gravity magnetic and heavy liquid methods to sort apatite minerals, and then select apatite minerals with intact crystals under a ZEISS AXIO Imager.A1m electron microscope; use LA-ICP-MS to test the age t of apatite fission track, the age t is the deformation time of the structure, the folds and faults of each structural layer have a corresponding formation time, according to the formation time of the folds and faults in each structural layer and between the structural layers, quantitatively determine the time sequence of structural deformation, the structural deformation can have one or more stages, each stage corresponds to a time Tg i ;

[0057] Step S15, profile structural evolution recovery: Select the seismic profile perpendicular to the deformation structure (folds and faults) and recover the structural evolution at the time Tg i Under the constraints, based on the structural background of the area where the deformed structure is located, the 2DMove software is used to restore the structure of the section. The time Tg of each structural deformation is i There is a corresponding structural section map, that is, each seismic section perpendicular to the deformation structure has its corresponding time Tgi The structural restoration section of

[0058] Step S16, plane structural restoration: select 15 to 20 seismic profiles at equal intervals in the longitudinal and transverse directions of the study area for profile structural restoration, and i The restored structural profile is imaged into a planar structural map using Surfer software, that is, the period Tg of each structural deformation i There is a corresponding plane structure diagram.

[0059] like Figure 2 As shown, a schematic diagram of the structural evolution restoration results (ancient burial depth map) of this embodiment is provided.

[0060] Step S102: Based on each structural deformation period Tg i The corresponding plane structure map is used to obtain the ancient burial depth H of the uranium reservoir in each geological historical period. i 、 paleo-inclination angle θ i and the paleo-migration distance parameter L of oxygen- and uranium-containing water i , thereby restoring the paleoparameter evolution history of uranium reservoirs in various geological historical periods.

[0061] The evolution history of paleoparameters can represent paleoparameters of uranium reservoirs at different periods in the form of isolines or similar methods. Step S102 can specifically include the following steps:

[0062] Step S21, read the ancient burial depth H i : Based on the period Tg of each structural deformation i Planar structural map, read the period of uranium reservoir deformation Tg i The ancient burial depth H i ;

[0063] Figure 2 In the above, the ancient burial depth H of different tectonic deformation periods can be directly read. i That is, the burial depth in the central area is greater, generally greater than 500m, while the burial depth in the north and southeast is smaller, generally less than 200m.

[0064] Step S22, obtain the ancient inclination angle θ i :Based on the elevation difference and horizontal distance of adjacent contour lines, the deformation period Tg of each structure on the contour line is obtained according to formula (1): i The paleo-inclination angle θ i :

[0065]

[0066] Among them, H i Tg is the period of structural deformation i Ancient burial depth of contour lines in the planar structural map, m; H i+1Tg is the period of structural deformation i The ancient burial depth of adjacent contour lines in the plane structure map, m; ΔL is the elevation difference between the burial depths of adjacent contour lines, m.

[0067] The paleo-inclination angle θ of the uranium reservoir calculated in this example is i Distribution, such as Figure 3 The paleo-inclination angle θ of the uranium reservoir in the western region is shown in Figure 1. i The paleo-inclination angles θ of the uranium reservoirs in the north and southeast are generally larger, usually greater than 20°. i Generally small, usually less than 10°.

[0068] Step S23, calculate the ancient horizontal migration distance L of oxygen-containing uranium-containing water i :The erosion source area of ​​the study area was directly determined by field investigation and reading previous data. In each period of structural deformation, Tg i The horizontal distance L between the erosion source area and each point in the plane structure map is measured in the plane structure map i .

[0069] The paleo-horizontal migration distance L of oxygen-containing uranium-containing water in the uranium reservoir obtained in this example i Distribution, such as Figure 4 The paleo-horizontal distance between the central part of the study area and the erosion source area is relatively large, generally greater than 20 km, while the paleo-horizontal distance between the marginal area and the erosion source area is relatively small, generally less than 10 m.

[0070] Step S103: Obtain the Trask sorting coefficient based on the uranium reservoir particle size analysis. Step S103 may specifically include the following steps:

[0071] Step S31, sample processing and testing: 100 g to 200 g of sandstone sample is taken and crushed into single rock particles using a grinder, and excess 6% hydrogen peroxide and 15% hydrochloric acid solution are added in sequence to remove organic matter and cementing matter respectively;

[0072] Add deionized water to repeatedly rinse the mud and acid until the sandstone particles are clean and the pH paper shows neutral. Put the sample into a constant temperature box at 105℃ until it is dried, and take it out after natural cooling;

[0073] Weigh 100 g of the treated sample and put it into a standard sieve. After vibrating for 15 minutes, weigh the mass of the sample in each standard sieve (each particle size fraction) and calculate the mass percentage of the sample in each particle size fraction.

[0074] Step S32: Determine the first quartile Q 1 and the third quartile Q 3 : The mass percentage data of each particle size sample are plotted into a cumulative distribution curve of particle size composition, and the particle size values ​​at 25% and 75% of the curve are respectively used as the first quartile Q 1and the third quartile Q 3 The cumulative distribution curve of the particle size composition of a sandstone sample in the uranium reservoir obtained in this embodiment is as follows: Figure 5 As shown, the first quartile Q 1 and the third quartile Q 3 They are 0.22mm and 0.15mm respectively.

[0075] Step S33, calculate Trask sorting coefficient S 0 :

[0076] According to Q 1 , Q 3 The relationship formula with Trask sorting coefficient is that formula (2) is used to calculate the Trask sorting coefficient S of uranium reservoir. 0

[0077] S 0 =(Q 1 / Q 3 ) / twenty two)

[0078] Trask sorting coefficient S for 50 samples on a plane 0 The Trask sorting coefficient S of the uranium reservoir in the study area can be obtained by calculation. 0 Plane contour map. Trask sorting coefficient S of sandstone samples in uranium reservoirs obtained in this example 0 Distribution, such as Figure 6 As shown, the Trask sorting coefficient S in the central and eastern part of the study area 0 The smaller the sandstone is, the better the sorting is, and the more developed the pores are. The Trask sorting coefficient S in the north and west is 0 Larger, that is, the sandstone is poorly sorted and the pores are not well developed.

[0079] Step S104: combining the formation water density and gravity acceleration, and calculating the flow capacity coefficient of the oxygen-containing uranium-containing water in the uranium reservoir by using the layer calculation module of the Trinity software through the ancient burial depth, ancient inclination, ancient horizontal migration distance of the oxygen-containing uranium-containing water and the Trask sorting coefficient, the flow capacity of the oxygen-containing uranium-containing water in each geological historical period is determined, and the evolution history of the flow capacity of the oxygen-containing uranium-containing water in the sandstone-type uranium deposit is reconstructed.

[0080] The flow capacity of oxygen-containing uranium-containing water is proportional to the component of gravity in the plane direction and the reservoir porosity, and inversely proportional to the horizontal migration distance. Therefore, the flow capacity coefficient can be used to evaluate the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium reservoirs. Combining the formation water density and gravity acceleration, the flow capacity coefficient of oxygen-containing uranium-containing water in the sandstone layer is calculated according to formula (3) through the ancient burial depth, ancient inclination, ancient horizontal migration distance of oxygen-containing uranium-containing water and Trask sorting coefficient, and quantitatively characterizes the flow capacity of oxygen-containing uranium-containing water in each uranium reservoir in each geological historical period, so as to reconstruct the evolution history of the flow capacity of oxygen-containing uranium-containing water in the uranium reservoir. The calculation formula of the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir is as follows:

[0081]

[0082] Where R(t) is the flow capacity coefficient of oxygen- and uranium-containing water at time t, dimensionless quantity; ρ w is the density of water, kg / m 3 ; g is the acceleration due to gravity, 9.8m / s 2 ; H is the burial depth, km; θ is the inclination angle of the uranium reservoir, °; is the porosity, %; L is the horizontal migration distance of oxygen-containing uranium-containing water, km; t is the geological history time, Ma; S 0 is the Trask sorting coefficient.

[0083] Among them, the greater the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir during the uranium mineralization period, the stronger its uranium mineralization and the greater its mineralization potential. The flow capacity of oxygen-containing uranium-containing water can be evaluated according to the flow capacity coefficient R(t) of oxygen-containing uranium-containing water in the uranium reservoir:

[0084] ① When R(t)≥10, the flow capacity of oxygen- and uranium-containing water is strong;

[0085] ② When 5≤R(t)<10, the flow capacity of oxygen- and uranium-containing water is medium;

[0086] ③When 0≤R(t)<5, the flowability of oxygen- and uranium-containing water is poor.

[0087] like Figure 7 As shown, a schematic diagram of the distribution of the flow capacity coefficient R(t) of oxygen-containing and uranium-containing water in the uranium reservoir of this embodiment is shown.

[0088] Figure 7In the main mineralization period (20 Ma ago) of the slope area in the central and eastern part of the study area, the mobility coefficient of oxygen-containing uranium water in the uranium reservoir was relatively large, generally greater than 12, so the recharge and discharge conditions of groundwater during the uranium mineralization period remained stable, the better the permeability of the aquifer, the stronger its ability to accept uranium-containing oxygen-containing water, the stronger the uranium mineralization, and the greater the mineralization potential. The mobility coefficient of oxygen-containing uranium water in the uranium reservoir in the western and northern parts of the study area was relatively small, generally less than 8, so the recharge and discharge conditions of groundwater during the uranium mineralization period were relatively weak, the permeability of the aquifer was relatively poor, the ability to accept uranium-containing oxygen-containing water was relatively weak, the uranium mineralization was relatively weak, and the mineralization potential was relatively small.

[0089] Through the above technical scheme, by restoring the structural evolution history of the structural layer where the uranium reservoir is located, the paleoparameter evolution history of the oxygen-containing uranium-containing water is obtained from the paleostructural restoration, and the Trask sorting coefficient of the uranium reservoir is calculated. Finally, combined with the formation water density and gravity acceleration, the flow capacity coefficient of the oxygen-containing uranium-containing water in the uranium reservoir is calculated through the paleo-burial depth, paleo-inclination, paleo-horizontal migration distance of the oxygen-containing uranium-containing water and the Trask sorting coefficient, and the flow capacity evolution history of the oxygen-containing uranium-containing water in the uranium reservoir is reconstructed. Thus, the flow capacity of the oxygen-containing uranium-containing water in the main mineralization period of the sandstone-type uranium deposit can be quantitatively revealed, so as to guide the prediction of favorable areas for sandstone-type uranium deposits:

[0090] ① When R(t)≥10, the flow capacity of oxygen- and uranium-containing water is strong;

[0091] ② When 5≤R(t)<10, the flow capacity of oxygen- and uranium-containing water is medium;

[0092] ③ When 0≤R(t)<5, the flow capacity of oxygen- and uranium-containing water is poor;

[0093] According to the specific implementation steps of the embodiment of the present invention, the flow capacity of oxygen-containing uranium-containing water can be quantitatively evaluated at different locations and at different times on the same sandstone-type uranium reservoir plane, thereby reconstructing the evolution history of the flow capacity of oxygen-containing uranium-containing water in the uranium reservoir.

[0094] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A method for evaluating the flow capacity of oxygen-containing uranium-containing water in sandstone-type uranium deposits, characterized in that: The method comprises the following steps: Step S101, based on the analysis of structural deformation characteristics, the structural evolution of the structural layer where the uranium reservoir is located is restored; Step S102, based on the planar structural map corresponding to each structural deformation period, obtaining the ancient burial depth, ancient dip angle and ancient migration distance parameters of oxygen-containing and uranium-containing water of the uranium reservoir in each geological historical period; Step S103, obtaining the Trask sorting coefficient based on the uranium reservoir particle size analysis; Step S104, calculating the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir, and determining the flow capacity of oxygen-containing uranium-containing water in each geological historical period; The step S101 includes: Step S11, identifying unconformity surface; Step S12, dividing the structural layers; Step S13, clarifying the basic structural style; Step S14, determining the time of structural deformation in the structural pattern; Step S15, restoring the profile structural evolution; Step S16: Restoring the plane structure.

2. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 1, characterized in that: The step S14 specifically includes: collecting sandstone samples, mechanically crushing and then sorting apatite minerals, and then selecting apatite minerals with intact crystals under an electron microscope; using LA-ICP-MS to test the age of apatite fission tracks, and the age is the deformation time of the structure.

3. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 1, characterized in that: The step S15 specifically includes: selecting a seismic profile perpendicular to the direction of the deformation structure, and under the constraint of the structural deformation time, based on the structural background of the area where the deformation structure is located, using 2DMove software to perform structural restoration of the profile, and obtaining a structural profile corresponding to each structural deformation time.

4. A method for evaluating the flowability of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 1, characterized in that: The step S16 specifically includes: using Surfer software to image the structural cross-section diagram of each structural deformation time restored by using the seismic section into a plane structural diagram, that is, a plane structural diagram corresponding to each structural deformation period.

5. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 1, characterized in that: The step S102 includes: Step S21: Based on the planar structural map of each structural deformation period, read the ancient burial depth H i ; Step S22: Based on the elevation difference and horizontal distance of adjacent contour lines, calculate the paleo-inclination angle θ i ; Step S23: Based on the planar structural diagram of each structural deformation period, calculate the ancient horizontal migration distance L of oxygen-containing and uranium-containing water i .

6. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 5, characterized in that: In step S22, the elevation difference and horizontal distance of adjacent contour lines are calculated according to the formula: Among them, H i Tg is the period of structural deformation i Ancient burial depth of contour lines in the planar structural map, m; H i+1 Tg is the period of structural deformation i The ancient burial depth of adjacent contour lines in the plane structure map, m; ΔL is the elevation difference between the burial depths of adjacent contour lines, m.

7. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 1, characterized in that: The step S103 includes: Step S31, sample processing and testing; Step S32, determining the first quartile Q1 and the third quartile Q3; Step S33, calculating the Trask sorting coefficient S0.

8. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 7, characterized in that: In step S33, the formula for calculating the Trask sorting coefficient S0 is: S0 = (Q1 / Q3) / 2.

9. A method for evaluating the flow capacity of oxygen-containing and uranium-containing water in sandstone-type uranium deposits according to claim 8, characterized in that: In step S104, the formula for calculating the flow capacity coefficient of oxygen-containing uranium-containing water in the uranium reservoir is: R(t) is the flow capacity coefficient of oxygen- and uranium-containing water at time t, a dimensionless quantity; ρ w is the density of water, kg / m 3 ; g is the acceleration due to gravity, 9.8m / s 2 ; H is the burial depth, km; θ is the inclination angle of the uranium reservoir, °; is the porosity, %; L is the horizontal migration distance of oxygen- and uranium-containing water, km; t is the geological history time, Ma; S0 is the Trask sorting coefficient.

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