Quantitative characterization method for relation between oxidized sand body and uranium mineralization in uranium reservoir

Abstract

The invention provides a quantitative characterization method for a metallogenic relationship between oxidized sand bodies and uranium in a uranium reservoir, which comprises the following steps of: acquiring field core logging and drilling information, identifying distribution characteristics of the oxidized sand bodies in the uranium reservoir, and establishing a uranium-bearing rock series stratigraphic framework; according to the uranium-bearing rock series stratigraphic framework, the oxidized sand body thickness, the oxidized sand body ratio, the sandstone type uranium mineralization thickness and grade data in each drilling layer are counted; by drawing a uranium-bearing rock system rock geochemical type profile and drawing a uranium reservoir uranium mineralization thickness and grade plane distribution diagram and an oxidized sand body thickness and ratio distribution diagram, the relation between oxidized sand body space distribution and uranium mineralization in a uranium reservoir is represented from the profile and the plane; drawing a scatter diagram of uranium mineralization thickness and grade and oxidized sand body ratio, and delineating a main mineralization area and a rich mineralization area; the method can enrich theoretical research on uranium mineralization, can also play a guiding role in exploration work of sandstone type uranium ore, and improves the accuracy and efficiency of uranium ore exploration.

Description

Technical Field

[0001] This invention relates to the field of uranium exploration technology, and in particular to a quantitative characterization method for the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs. Background Technology

[0002] Sandstone-type uranium deposits are among the most important types of uranium resources globally. Their mineralization is closely related to the evolution and post-continental alteration of sedimentary basins. These deposits typically form in Mesozoic-Cenozoic terrestrial or marine-continental transitional coal-bearing and oil-bearing sandstone strata, controlled by the development of interlayer oxidation zones. Driven by basin uplift or tectonic activity, oxygen-rich groundwater seeps laterally along permeable sand bodies, forming oxidation fronts. This, combined with the primary reducing environment, creates geochemical oxidation-reduction barriers, driving the reduction and precipitation of hexavalent uranium. Mineralization is strictly controlled at the location of the oxidation sand body front, often distributed in a banded pattern along the unconformity surfaces or permeable channels of the sand body, forming "red-green" interlayer oxidation zone-type uranium deposits associated with oil and gas reservoirs and coal seams.

[0003] A method for predicting favorable sand bodies and zones in sandstone-type uranium deposits, disclosed in publication number CN107664772A, includes the following steps: paleogeomorphological reconstruction; paleogeomorphological unit division; and prediction of favorable sand bodies and zones for uranium mineralization. This method delineates favorable areas for sandstone-type uranium mineralization by reconstructing the paleogeomorphological characteristics of the ore-bearing target layer during its depositional period and key uranium mineralization periods.

[0004] In existing sandstone-type uranium deposit exploration, the relationship between oxidized sand bodies and uranium mineralization is not accurately characterized. Traditional methods rely on two-dimensional static analysis with single parameters, which leads to strong subjectivity in target area delineation, easy omission of concealed ore bodies, and reduced accuracy of mineralization prediction and exploration efficiency. Summary of the Invention

[0005] In view of this, the present invention proposes a quantitative characterization method for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs. By characterizing the relationship between the spatial distribution of oxidized sand bodies and uranium mineralization in uranium reservoirs from both cross-sectional and planar perspectives, this method can enrich the theoretical research on uranium mineralization, provide guidance for the exploration of sandstone-type uranium deposits, and improve the accuracy and efficiency of uranium exploration.

[0006] The technical solution of this invention is implemented as follows: In a first aspect, this invention provides a method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs, comprising the following steps: S1, obtain field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series; S2, based on the stratigraphic framework of uranium-bearing rock series, statistical data on the thickness and ratio of oxidized sand bodies and the thickness and grade of sandstone-type uranium mineralization in each borehole layer were collected; S3, based on the stratigraphic framework of uranium-bearing rock series, establish a profile of rock geochemical types and determine the vertical spatial relationship between oxidized sand bodies and uranium mineralization; S4. Based on the statistical results and using planar plotting software, generate planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade. S5. Based on drawing software, the planar distribution maps of the uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness and uranium mineralization grade are superimposed. Combined with the vertical spatial relationship between oxide sand body and uranium mineralization, the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade and oxide sand body ratio, and oxide sand body thickness is characterized. S6. Based on the statistical results, draw a scatter plot of the thickness, grade and ratio of uranium mineralization in sandstone-type uranium mineralization to oxidized sand bodies, delineate the main mineralization areas and rich mineralization areas, and establish a quantitative relationship between uranium mineralization and oxidized sand bodies.

[0007] Based on the above technical solutions, preferably, in step S1, core logging and borehole information are obtained to identify the distribution characteristics of oxidized sand bodies in uranium reservoirs and to establish a stratigraphic framework for uranium-bearing rock series. Specifically, through core logging, oxidized sand bodies are identified based on color, mineral assemblage, and geochemical indicators, and the vertical sequence of borehole cores is recorded. Borehole information includes logging, well logging, seismic, and paleontological data. Based on the logging data and sequence stratigraphic unit correlation, a stratigraphic framework for uranium-bearing rock series is established.

[0008] Based on the above technical solutions, preferably, in step S2, according to the stratigraphic framework of uranium-bearing rock series, the thickness, ratio, thickness, and grade of uranium mineralization in each borehole layer are statistically analyzed. Specifically, based on the three-dimensional stratigraphic framework of uranium-bearing rock series, target layers are divided according to sequence stratigraphic units, and the top and bottom plate depths of the corresponding layers for each borehole are extracted. The borehole data are vertically aligned with the stratigraphic framework. The cumulative thickness of all sandstone layers in the target layer of each borehole is statistically analyzed to obtain the total sand body thickness. The thickness of oxidized sand body in the target layer of the borehole in the study area is obtained. The ratio of oxidized sand body thickness to total sand body thickness in uranium reservoir is calculated. The thickness and grade of uranium mineralization in the target layer of each borehole are obtained based on the logging data.

[0009] Based on the above technical solutions, preferably, in step S3, a rock geochemical type profile is established based on the stratigraphic framework of uranium-bearing rock series to determine the vertical spatial relationship between oxidized sand bodies and uranium mineralization. Based on the stratigraphic framework of uranium-bearing rock series, the Gauss-Kruger projection system was adopted in the planar drawing software, and the Yellow Sea elevation datum was selected to ensure that the position of the borehole on the planar map matches the actual geographical location. Arrange each borehole in a proportional manner in the planar drawing software according to the actual distance and elevation, keeping the relative positional relationship between the boreholes unchanged; Record the different lithological data in each borehole, and connect them according to the lithological changes in the drawing software to establish a rock geochemical type profile map so as to characterize the distribution of oxidized sand bodies from the profile. Based on the rock geochemical type profile, combined with well logging data and core analysis results, the uranium mineralization data in each borehole is delineated, and different colors are used to represent uranium mineralization sections of different grades to characterize the spatial distribution of uranium mineralization. By analyzing the rock geochemical type profile, the vertical spatial relationship between oxidized sand bodies and uranium mineralization was determined.

[0010] Based on the above technical solution, preferably, the vertical spatial relationship between the oxidized sand body and uranium mineralization in step S3 includes the position of the oxidation front zone and the vertical gradient of the oxidized sand body thickness, wherein, By analyzing the rock geochemical type profile, and combining geochemical indicators and mineralogical characteristics, the critical interface where oxidation transitions from strong to weak is identified vertically, which serves as the location of the oxidation front zone. The vertical gradient is calculated by dividing the change in thickness by the change in depth. The cause of the gradient is interpreted by sedimentary facies analysis. A high positive gradient reflects the injection of strong oxidizing fluids, while a low or negative gradient indicates a weakening of oxidation or the intervention of a reducing environment, with uranium gradually precipitating at the redox interface. The correlation between the ratio of oxidized sand bodies and the thickness and grade of uranium mineralization is verified by statistical methods, and a quantitative relationship between the two is established.

[0011] Based on the above technical solutions, preferably, step S4 generates planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade according to statistical results and based on planar plotting software, including the following sub-steps: Based on the statistical results, the borehole locations, oxide sand body thickness, oxide sand body ratio, uranium mineralization thickness, and uranium mineralization grade of each borehole in the study area were projected using three-dimensional geological mapping software, and corresponding contour maps were generated using spatial interpolation algorithms. Import the data on the location of each borehole, the thickness of the oxide sand body, the ratio of the oxide sand body, the thickness of the uranium mineralization, the grade of the uranium mineralization, and the corresponding contour maps into the planar drawing software; Based on planar plotting software, the data on the thickness of oxidized sand bodies, the ratio of oxidized sand bodies, the thickness of sandstone-type uranium mineralization, and the grade of sandstone-type uranium mineralization in different boreholes within the same value range were delineated and connected separately. The closed areas formed by connecting different value ranges were filled with different colors to obtain spatial distribution maps of uranium reservoir oxidized sand body ratio, oxidized sand body thickness, uranium mineralization thickness, and uranium mineralization grade.

[0012] Based on the above technical solutions, preferably, step S5 involves overlaying a planar distribution map of the uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade using drawing software, and combining this with the vertical spatial relationship between oxide sand bodies and uranium mineralization to characterize the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness. This includes the following sub-steps: Based on planar plotting software, the planar distribution map of uranium mineralization thickness is overlaid with the spatial distribution map of oxide sand body ratio, the planar distribution map of uranium mineralization thickness is overlaid with the planar distribution map of oxide sand body thickness, the planar distribution map of uranium mineralization grade is overlaid with the spatial distribution map of oxide sand body ratio, and the planar distribution map of uranium mineralization grade is overlaid with the planar distribution map of oxide sand body thickness. Scatter plots were drawn for uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness to quantitatively characterize the configuration relationship of uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness. The planar overlay maps are linked with the rock geochemical type profile maps in three dimensions to analyze whether the planar spatial configuration is consistent in the vertical direction. Based on the above technical solutions, preferably, in step S6, a scatter plot of the thickness, grade, and ratio of oxidized sandstone uranium mineralization is drawn according to the statistical results, delineating the main mineralization areas and rich mineralization areas, and establishing a quantitative relationship between uranium mineralization and oxidized sandstone bodies, including the following sub-steps: S61. Based on the statistical data of oxidized sand body ratio, sandstone-type uranium mineralization thickness and uranium mineralization grade, a three-dimensional dataset is formed. S62, perform data cleaning and standardization on the 3D dataset to obtain a 3D standard dataset; S63. Based on the three-dimensional standard dataset, a scatter plot of uranium mineralization thickness versus oxide sand body ratio and a scatter plot of uranium mineralization grade versus oxide sand body ratio were plotted using function software. S64. Based on the dispersion of the scatter plot, determine the configuration relationship between the oxide sand body ratio and the uranium mineralization thickness and uranium mineralization grade. S65, in planar drawing software, uses hotspot analysis to identify high-value clusters of uranium mineralization thickness and grade; Based on the plane distribution map of the ratio of oxidized sand bodies and the plane distribution map of uranium mineralization thickness and grade, the oxidized sand body front area is delineated as the main mineralization area, and the high-value accumulation area of ​​uranium mineralization thickness and uranium mineralization grade is delineated as the rich mineralization area.

[0013] S67, establish the quantitative relationship between uranium mineralization and oxidized sand bodies based on the mineralization area and the rich mineralization area.

[0014] Based on the above technical solutions, preferably, step S67 establishes a quantitative relationship between uranium mineralization and oxidized sand bodies according to the ore-forming area and the rich mineralization area. In the main mineralization area, the uranium mineralization thickness is 0-10m, the uranium mineralization grade is 20-100ppm, and the oxidized sand body ratio is 0-40%. In the rich mineralization area, the uranium mineralization thickness is 10-25m, the ore body grade is 100-250ppm, and the oxidized sand body ratio is 0-20%.

[0015] Secondly, the present invention also provides a quantitative characterization system for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs, implemented using a quantitative characterization method for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs, the system comprising: The data acquisition module is used to acquire field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series. The data statistics module is used to statistically analyze the thickness, ratio, and thickness and grade of sandstone-type uranium mineralization in each borehole layer based on the stratigraphic framework of uranium-bearing rock series. The profile creation module, based on the stratigraphic framework of uranium-bearing rock series, establishes profiles of rock geochemical types and determines the vertical spatial relationship between oxidized sand bodies and uranium mineralization; The planar map generation module is used to generate planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on statistical results and planar drawing software. The spatial configuration module is used to overlay planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on drawing software, and characterize the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness by combining the vertical spatial relationship between oxide sand bodies and uranium mineralization. The relational model building module is used to draw scatter plots of the thickness, grade and ratio of uranium mineralization in sandstone-type mineralization to oxidized sand bodies based on statistical results, delineate the main mineralization areas and rich mineralization areas, and establish a quantitative relationship between uranium mineralization and oxidized sand bodies.

[0016] The quantitative characterization method for the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs of the present invention has the following advantages over the prior art: (1) By drawing geochemical profiles of uranium-bearing rock series and drawing planar distribution maps of uranium mineralization thickness and grade in uranium reservoirs, and superimposing distribution maps of oxide sand body thickness and ratio, the relationship between the spatial distribution of oxide sand bodies in uranium reservoirs and uranium mineralization can be characterized from the profiles and planes. Scatter plots of uranium mineralization thickness and grade and oxide sand body ratio can be drawn to delineate the main mineralization areas and rich mineralization areas. This method can enrich the theoretical research on uranium mineralization, guide the exploration of sandstone-type uranium deposits, and improve the accuracy and efficiency of uranium exploration. (2) By combining the location of the vertical oxidation front, the thickness variation gradient of the oxidation sand body and the planar superposition analysis based on the rock geochemical type profile and planar distribution map, the spatial configuration relationship between the oxidation sand body and uranium mineralization was revealed, providing data support for establishing the quantitative relationship between uranium mineralization and oxidation sand body; (3) By drawing scatter plots of uranium mineralization thickness, grade and ratio of oxidized sand bodies, combined with hot spot analysis, the main mineralization areas and rich mineralization areas were delineated, and the quantitative relationship between uranium mineralization and oxidized sand bodies was established, which significantly improved the accuracy of target area positioning. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the process of the present invention; Figure 2 This is a cross-sectional view of the rock geochemical type of the present invention; Figure 3 Figure (a) shows the planar distribution of the thickness of oxide sand bodies in uranium reservoirs in the southern Songliao Basin. Figure 3 Figure (b) shows the planar distribution of the oxidized sand body ratio in the southern Songliao Basin. Figure 4 Figure (a) shows the planar distribution of sandstone-type uranium mineralization grades in the southern Songliao Basin. Figure 4 Figure (b) shows the planar distribution of the thickness of sandstone-type uranium mineralization in the southern Songliao Basin; Figure 5 Figure (a) is a planar overlay of the thickness of sandstone-type uranium mineralization and oxide sand body in the southern Songliao Basin. Figure 5 Figure (b) is a planar overlay diagram showing the uranium mineralization grade and oxide sand body thickness in the southern Songliao Basin. Figure 6 Figure (a) is a planar overlay diagram of the uranium mineralization thickness and oxide sand body ratio of uranium reservoirs in the southern Songliao Basin. Figure 6 Figure (b) is a planar overlay diagram showing the ratio of uranium mineralization grade to oxide sand body in the southern Songliao Basin. Figure 7 Figure (a) is a scatter plot of the ratio of uranium mineralization thickness to oxide sand bodies in uranium reservoirs in the southern Songliao Basin. Figure 7 Figure (b) is a scatter plot showing the ratio of uranium mineralization grade to oxide sand bodies in uranium reservoirs in the southern Songliao Basin. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, in a first aspect, the present invention provides a method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs, comprising the following steps: This embodiment uses geochemical profiles of uranium-bearing rock formations and planar distribution maps of uranium mineralization thickness and grade in uranium reservoirs, superimposed with maps of oxide sand body thickness and ratio distribution, to characterize the relationship between the spatial distribution of oxide sand bodies and uranium mineralization in uranium reservoirs from both cross-sectional and planar perspectives. A scatter plot of uranium mineralization thickness and grade versus oxide sand body ratio is also plotted to delineate major mineralization areas and rich mineralization areas, summarizing oxide sand body ratios favorable for uranium mineralization. This method can enrich the theoretical research on uranium mineralization and provide guidance for sandstone-type uranium deposit exploration, improving the accuracy and efficiency of uranium exploration. The following example uses the relationship between oxide sand bodies and uranium mineralization in the lacustrine extension systems tract of the Yaojia Formation in the southern Songliao Basin. Figure 1 The characterization method of the illustrated embodiment will be described.

[0021] S1, obtain field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series.

[0022] This embodiment identifies oxidized sand bodies based on color, mineral assemblage, and geochemical indicators through core logging. It further subdivides oxidized sandstone types by grain size, including coarse sandstone oxidation zone, medium sandstone transition zone, and fine sandstone reduction zone, and records their vertical sequence. Drilling information includes well logging, well logging, seismic, and paleontological data. Based on well logging data and sequence stratigraphic unit correlation, a stratigraphic framework for uranium-bearing rock series is established.

[0023] It should be noted that when performing core logging and data processing, the following should be observed: Oxidized sand bodies in uranium reservoirs refer to oxidized sandstone. These oxidized sand bodies contain oxides such as hematite and limonite, primarily indicating an oxidizing environment. Oxidized sand bodies mainly include: red, light red, purplish-red, brick red, yellow, and purplish-red coarse-medium-fine sandstones. All oxidized sand bodies can indicate an oxidizing environment; the oxidation zone is characterized by medium Fe... 3+ / Fe 2+ >3, Eh value >200mV; redox conditions fluctuate in the transition zone, with interlayer oxidation fronts developing; elemental uranium (U) exhibits both adsorption and precipitation occurrences, among which Fe... 3+ / Fe 2+=1-3, strawberry-like pyrite rudimentary crystals appear; the reduction zone indicates a reducing environment, Fe 3+ / Fe 2+ <1, TOC>0.5%, containing intact pyrite crystals. A vertical oxidation-reduction sequence model of the Yaojia Formation was established to clarify the thickness and distribution range of the oxide sand body.

[0024] S2. Based on the stratigraphic framework of uranium-bearing rock series, statistical data on the thickness, ratio, thickness, and grade of oxidized sand bodies and sandstone-type uranium mineralization in each borehole layer were collected.

[0025] This embodiment is based on a three-dimensional stratigraphic framework of uranium-bearing rock formations. Target strata are divided according to sequence stratigraphic units, and the top and bottom plate depths of the corresponding strata for each borehole are extracted. The borehole data are vertically aligned with the stratigraphic framework. The cumulative thickness of all sandstone layers within the target stratum of each borehole is calculated to obtain the total sand body thickness. The thickness of uranium reservoir oxide sand bodies in the target strata of the boreholes in the study area is obtained. Based on the ratio of uranium reservoir oxide sand body thickness to total sand body thickness, the oxide sand body ratio is calculated. The thickness and grade of sandstone-type uranium mineralization in the target strata of each borehole are obtained based on well logging data.

[0026] It should be noted that, based on the established isochronous stratigraphic framework of uranium-bearing rock series, the principle of "baseline cycle + accommodateable spatial variation" is adopted to subdivide the target strata into three-level sequence stratigraphic units. The borehole data is vertically aligned with the stratigraphic framework. For lithologically missing sections, the lithology of the missing sections can be identified based on the logging curves. For example, when the rock lithology changes from "coarse sandstone to medium sandstone to fine sandstone to mudstone", the rock permeability decreases from good to bad, and the spontaneous potential amplitude decreases from large to small. The lithological data of the missing sections in the logging can also be supplemented by statistical analysis based on the lithological characteristics of the upper, lower, and surrounding areas. The cumulative thickness of all sandstones in the target strata of a single borehole is calculated to obtain the total sand body thickness. The thickness of the oxide sand body is obtained based on the identification of oxide sand bodies. The oxide sand body ratio is calculated based on the ratio of the oxide sand body thickness of the uranium reservoir to the total sand body thickness. The thickness and grade of sandstone-type uranium mineralization in the target strata of each borehole are obtained based on the logging data.

[0027] like Figure 2 As shown in Figure S3, based on the stratigraphic framework of uranium-bearing rock series, a rock geochemical type profile was established to determine the vertical spatial relationship between oxidized sand bodies and uranium mineralization.

[0028] Based on the stratigraphic framework of uranium-bearing rock strata, the Gauss-Kruger projection system was used in the planar mapping software, and the Yellow Sea elevation datum was selected to ensure that the position of the boreholes on the planar map matched the actual geographical location. The boreholes were arranged proportionally in the planar mapping software according to their actual distance and elevation, maintaining the relative positional relationship between the boreholes. Different lithological data in each borehole were recorded and connected according to lithological changes in the mapping software to establish a rock geochemical type profile, representing the distribution of oxidized sand bodies from the profile. Based on the rock geochemical type profile, combined with well logging data and core analysis results, uranium mineralization data in each borehole was delineated, with different colors representing uranium mineralization sections of different grades, characterizing the spatial distribution of uranium mineralization. Through analysis of the rock geochemical type profile, the vertical spatial relationship between oxidized sand bodies and uranium mineralization was determined. During this process, red and yellow coarse-medium-fine sandstones were uniformly treated as uranium reservoir oxidized sand bodies to avoid profile complexity caused by finer grain size analysis.

[0029] In addition, the vertical spatial relationship between the oxidized sand body and uranium mineralization in step S3 includes the location of the oxidation front zone and the vertical variation gradient of the thickness of the oxidized sand body. Specifically, by analyzing the rock geochemical type profile and combining geochemical indicators and mineralogical characteristics, the critical interface where oxidation changes from strong to weak is identified vertically and used as the location of the oxidation front zone. It should be noted that in the rock geochemical type profile, Fe is labeled 3+ / Fe 2+ Contour lines are used to extract abrupt change zones with ratios ranging from >3 to <1. Mineralogical evidence is combined to determine the boundaries of the front zone. The depths of the front zones in adjacent boreholes are compared, and interpolation is used to generate contour maps of the front zone.

[0030] The vertical gradient is calculated by dividing the change in thickness by the change in depth, expressed as: gradient = Δoxidized sand body thickness / Δ depth. The gradient formation is interpreted by combining sedimentary facies analysis. A high positive gradient reflects the injection of strong oxidizing fluids, while a low or negative gradient indicates weakened oxidation or the intervention of a reducing environment, with uranium gradually precipitating at the oxidation-reduction interface. The correlation between the oxidized sand body ratio and the uranium mineralization thickness and grade is verified by statistical methods, establishing a quantitative relationship between the two.

[0031] like Figure 3 and Figure 4 As shown in Figure S4, based on the statistical results and using planar plotting software, planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade are generated respectively.

[0032] Step S4 includes the following sub-steps: Based on the statistical results, the borehole locations, oxide sand body thickness, oxide sand body ratio, uranium mineralization thickness, and uranium mineralization grade of each borehole in the study area were projected using three-dimensional geological mapping software, and corresponding contour maps were generated using spatial interpolation algorithms. Import the data on the location of each borehole, the thickness of the oxide sand body, the ratio of the oxide sand body, the thickness of the uranium mineralization, the grade of the uranium mineralization, and the corresponding contour maps into the planar drawing software; Based on planar plotting software, the data on the thickness of oxidized sand bodies, the ratio of oxidized sand bodies, the thickness of sandstone-type uranium mineralization, and the grade of sandstone-type uranium mineralization in different boreholes within the same value range were delineated and connected separately. The closed areas formed by connecting different value ranges were filled with different colors to obtain spatial distribution maps of uranium reservoir oxidized sand body ratio, oxidized sand body thickness, uranium mineralization thickness, and uranium mineralization grade.

[0033] It should be noted that the coordinates (X, Y, Z), oxide sand body thickness (OST), oxide sand body ratio (OSR), uranium mineralization thickness (UT), and uranium grade (UG) of each borehole were imported into the software. Kriging interpolation was used for the oxide sand body thickness (OST), with a range of 500m and a nugget effect of 0.1, generating an OST contour map. Inverse distance weighted interpolation was used for the oxide sand body ratio (OSR), with a power of 2, generating an OSR contour map. Co-kriging interpolation was used for the uranium mineralization parameters (UT / UG), with OST as a covariate to improve interpolation accuracy. The interpolation results were compared with those of the verification boreholes that were not involved in the modeling, the error was calculated, and a three-dimensional geological model was generated to show the spatial superposition relationship between oxide sand bodies and uranium mineralization. This achieved a planar visualization of oxide sand bodies and uranium mineralization parameters and established a multi-parameter coupled mineralization prediction model. This method significantly improves the target area positioning accuracy and resource estimation reliability of sandstone-type uranium deposit exploration, providing support for uranium deposit exploration in similar basins.

[0034] like Figure 5 and Figure 6 As shown in Figure S5, based on the drawing software, a planar distribution map of the uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade is superimposed. Combined with the vertical spatial relationship between oxide sand bodies and uranium mineralization, the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness is characterized.

[0035] Step S5 includes the following sub-steps: Based on planar plotting software, the planar distribution map of uranium mineralization thickness is overlaid with the spatial distribution map of oxide sand body ratio, the planar distribution map of uranium mineralization thickness is overlaid with the planar distribution map of oxide sand body thickness, the planar distribution map of uranium mineralization grade is overlaid with the spatial distribution map of oxide sand body ratio, and the planar distribution map of uranium mineralization grade is overlaid with the planar distribution map of oxide sand body thickness. Scatter plots were drawn for uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness to quantitatively characterize the configuration relationship of uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness. The planar overlay maps are linked with the rock geochemical type profile maps in three dimensions to analyze whether the planar spatial configuration is consistent in the vertical direction. It should be noted that by overlaying the uranium mineralization thickness planar map with the oxide sand body ratio planar map, the overlap between high UT and high OSR zones can be observed. Overlaying the uranium mineralization thickness planar map with the oxide sand body thickness planar map can analyze the control effect of thick oxide sand bodies on UT. Overlaying the uranium grade planar map with the oxide sand body ratio planar map can identify the correlation between high-grade uranium ore and the oxide sand body ratio. Overlaying the uranium grade planar map with the oxide sand body thickness planar map can assess the impact of oxide sand body thickness on uranium grade. Through the above overlay operations and spatial configuration characterization, the spatial correlation between uranium mineralization and oxidation parameters can be intuitively revealed, providing important evidence for sandstone-type uranium deposit exploration.

[0036] like Figure 7 As shown in Figure S6, based on the statistical results, a scatter plot of the thickness, grade and ratio of uranium mineralization in sandstone type was drawn to delineate the main mineralization area and rich mineralization area, and to establish the quantitative relationship between uranium mineralization and oxidized sand body.

[0037] Step S6 includes the following sub-steps: S61. Based on the statistical data of oxidized sand body ratio, sandstone-type uranium mineralization thickness and uranium mineralization grade, a three-dimensional dataset is formed. S62, perform data cleaning and standardization on the 3D dataset to obtain a 3D standard dataset; S63. Based on the three-dimensional standard dataset, a scatter plot of uranium mineralization thickness versus oxide sand body ratio and a scatter plot of uranium mineralization grade versus oxide sand body ratio were plotted using function software. S64. Based on the dispersion of the scatter plot, determine the configuration relationship between the oxide sand body ratio and the uranium mineralization thickness and uranium mineralization grade. S65, in planar drawing software, uses hotspot analysis to identify high-value clusters of uranium mineralization thickness and grade; Based on the plane distribution map of the ratio of oxidized sand bodies and the plane distribution map of uranium mineralization thickness and grade, the oxidized sand body front area is delineated as the main mineralization area, and the high-value accumulation area of ​​uranium mineralization thickness and uranium mineralization grade is delineated as the rich mineralization area.

[0038] S67, establish the quantitative relationship between uranium mineralization and oxidized sand bodies based on the mineralization area and the rich mineralization area.

[0039] In the main mineralization area, the uranium mineralization thickness is 0-10m, the uranium mineralization grade is 20-100ppm, and the oxidized sand body ratio is 0-40%; in the rich mineralization area, the uranium mineralization thickness is 10-25m, the ore body grade is 100-250ppm, and the oxidized sand body ratio is 0-20%.

[0040] It should be noted that establishing a quantitative relationship between sandstone-type uranium mineralization and oxidized sand bodies can enrich the theoretical research on uranium mineralization, provide guidance for the exploration of sandstone-type uranium deposits, and improve the accuracy and efficiency of uranium exploration.

[0041] Secondly, the present invention also provides a quantitative characterization system for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs, implemented using a quantitative characterization method for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs, the system comprising: The data acquisition module is used to acquire field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series. The data statistics module is used to statistically analyze the thickness, ratio, and thickness and grade of sandstone-type uranium mineralization in each borehole layer based on the stratigraphic framework of uranium-bearing rock series. The profile creation module, based on the stratigraphic framework of uranium-bearing rock series, establishes profiles of rock geochemical types and determines the vertical spatial relationship between oxidized sand bodies and uranium mineralization; The planar map generation module is used to generate planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on statistical results and planar drawing software. The spatial configuration module is used to overlay planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on drawing software, and characterize the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness by combining the vertical spatial relationship between oxide sand bodies and uranium mineralization. The relational model building module is used to draw scatter plots of the thickness, grade and ratio of uranium mineralization in sandstone-type mineralization to oxidized sand bodies based on statistical results, delineate the main mineralization areas and rich mineralization areas, and establish a quantitative relationship between uranium mineralization and oxidized sand bodies.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs, characterized in that, Includes the following steps: S1, obtain field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series; S2, based on the stratigraphic framework of uranium-bearing rock series, statistical data on the thickness and ratio of oxidized sand bodies and the thickness and grade of sandstone-type uranium mineralization in each borehole layer were collected; S3, based on the stratigraphic framework of uranium-bearing rock series, establish a profile of rock geochemical types and determine the vertical spatial relationship between oxidized sand bodies and uranium mineralization; S4. Based on the statistical results and using planar plotting software, generate planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade. S5. Based on drawing software, the planar distribution maps of the uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness and uranium mineralization grade are superimposed. Combined with the vertical spatial relationship between oxide sand body and uranium mineralization, the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade and oxide sand body ratio, and oxide sand body thickness is characterized. S6. Based on the statistical results, draw a scatter plot of the thickness, grade and ratio of uranium mineralization in sandstone-type uranium mineralization to oxidized sand bodies, delineate the main mineralization areas and rich mineralization areas, and establish a quantitative relationship between uranium mineralization and oxidized sand bodies.

2. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: In step S1, core logging and borehole information are obtained to identify the distribution characteristics of oxidized sand bodies in uranium reservoirs and to establish a stratigraphic framework for uranium-bearing rock series. Specifically, through core logging, oxidized sand bodies are identified based on color, mineral assemblage, and geochemical indicators, and the vertical sequence of borehole cores is recorded. Borehole information includes logging, well logging, seismic, and paleontological data. Based on the logging data and sequence stratigraphic unit correlation, a stratigraphic framework for uranium-bearing rock series is established.

3. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: In step S2, based on the stratigraphic framework of the uranium-bearing rock system, the thickness, ratio, and thickness and grade of sandstone-type uranium mineralization in each borehole layer are statistically analyzed. Specifically, based on the three-dimensional stratigraphic framework of the uranium-bearing rock system, the target layers are divided according to sequence stratigraphic units. The cumulative thickness of all sandstone layers in the target layer of each borehole is calculated to obtain the total sand body thickness. The thickness of oxidized sand bodies in the target layer of the borehole in the study area is also obtained. The ratio of oxidized sand body thickness to total sand body thickness in the uranium reservoir is calculated. Finally, the thickness and grade of sandstone-type uranium mineralization in the target layer of each borehole are obtained based on the logging data.

4. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: In step S3, based on the stratigraphic framework of uranium-bearing rock series, a rock geochemical type profile is established to determine the vertical spatial relationship between oxidized sand bodies and uranium mineralization. Based on the stratigraphic framework of uranium-bearing rock series, the Gauss-Kruger projection system was adopted in the planar drawing software, and the Yellow Sea elevation datum was selected to ensure that the position of the borehole on the planar map matches the actual geographical location. Arrange each borehole in a proportional manner in the planar drawing software according to the actual distance and elevation, keeping the relative positional relationship between the boreholes unchanged; Record the different lithological data in each borehole, and connect them according to the lithological changes in the drawing software to establish a rock geochemical type profile map so as to characterize the distribution of oxidized sand bodies from the profile. Based on the rock geochemical type profile, combined with well logging data and core analysis results, the uranium mineralization data in each borehole is delineated, and different colors are used to represent uranium mineralization sections of different grades to characterize the spatial distribution of uranium mineralization. By analyzing the rock geochemical type profile, the vertical spatial relationship between oxidized sand bodies and uranium mineralization was determined.

5. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 4, characterized in that: The vertical spatial relationship between the oxidized sand body and uranium mineralization in step S3 includes the location of the oxidation front and the vertical variation in the thickness of the oxidized sand body. By analyzing the rock geochemical type profile, and combining geochemical indicators and mineralogical characteristics, the critical interface where oxidation transitions from strong to weak is identified vertically, which serves as the location of the oxidation front zone. The vertical gradient is calculated by dividing the change in thickness by the change in depth. The cause of the gradient is interpreted by sedimentary facies analysis. A high positive gradient reflects the injection of strong oxidizing fluids, while a low or negative gradient indicates a weakening of oxidation or the intervention of a reducing environment, with uranium gradually precipitating at the redox interface. The correlation between the ratio of oxidized sand bodies and the thickness and grade of uranium mineralization is verified by statistical methods, and a quantitative relationship between the two is established.

6. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: Step S4 generates planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on statistical data and planar plotting software. This includes the following sub-steps: Based on the statistical results, the borehole locations, oxide sand body thickness, oxide sand body ratio, uranium mineralization thickness, and uranium mineralization grade of each borehole in the study area were projected using three-dimensional geological mapping software, and corresponding contour maps were generated using spatial interpolation algorithms. Import the data on the location of each borehole, the thickness of the oxide sand body, the ratio of the oxide sand body, the thickness of the uranium mineralization, the grade of the uranium mineralization, and the corresponding contour maps into the planar drawing software; Based on planar plotting software, the data on the thickness of oxidized sand bodies, the ratio of oxidized sand bodies, the thickness of sandstone-type uranium mineralization, and the grade of sandstone-type uranium mineralization in different boreholes within the same value range were delineated and connected separately. The closed areas formed by connecting different value ranges were filled with different colors to obtain spatial distribution maps of uranium reservoir oxidized sand body ratio, oxidized sand body thickness, uranium mineralization thickness, and uranium mineralization grade.

7. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: Step S5 involves overlaying planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade using drawing software. Combined with the vertical spatial relationship between oxide sand bodies and uranium mineralization, the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness is characterized. This includes the following sub-steps: Based on planar plotting software, the planar distribution map of uranium mineralization thickness is overlaid with the spatial distribution map of oxide sand body ratio, the planar distribution map of uranium mineralization thickness is overlaid with the planar distribution map of oxide sand body thickness, the planar distribution map of uranium mineralization grade is overlaid with the spatial distribution map of oxide sand body ratio, and the planar distribution map of uranium mineralization grade is overlaid with the planar distribution map of oxide sand body thickness. Scatter plots were drawn for uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness to quantitatively characterize the configuration relationship of uranium mineralization thickness, uranium mineralization grade to oxide sand body ratio, and oxide sand body thickness. By linking the various planar overlay maps with the rock geochemical type profile maps in three dimensions, we can analyze whether the planar spatial configuration is consistent in the vertical direction.

8. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that: In step S6, based on the statistical results, a scatter plot of the thickness, grade, and ratio of uranium mineralization to oxidized sand bodies in sandstone-type uranium mineralization is drawn to delineate the main mineralization areas and rich mineralization areas, and to establish a quantitative relationship between uranium mineralization and oxidized sand bodies. This includes the following sub-steps: S61. Based on the statistical data of oxidized sand body ratio, sandstone-type uranium mineralization thickness and uranium mineralization grade, a three-dimensional dataset is formed. S62, perform data cleaning and standardization on the 3D dataset to obtain a 3D standard dataset; S63. Based on the three-dimensional standard dataset, a scatter plot of uranium mineralization thickness versus oxide sand body ratio and a scatter plot of uranium mineralization grade versus oxide sand body ratio were plotted using function software. S64. Based on the dispersion of the scatter plot, determine the configuration relationship between the oxide sand body ratio and the uranium mineralization thickness and uranium mineralization grade. S65, in planar drawing software, uses hotspot analysis to identify high-value clusters of uranium mineralization thickness and grade; Based on the plane distribution map of the ratio of oxidized sand bodies and the plane distribution map of uranium mineralization thickness and grade, the oxidized sand body front area is delineated as the main mineralization area, and the high-value accumulation area of ​​uranium mineralization thickness and uranium mineralization grade is delineated as the rich mineralization area. S67, establish the quantitative relationship between uranium mineralization and oxidized sand bodies based on the mineralization area and the rich mineralization area.

9. The method for quantitatively characterizing the relationship between oxide sand bodies and uranium mineralization in uranium reservoirs as described in claim 1, characterized in that, Step S67 establishes a quantitative relationship between uranium mineralization and oxidized sand bodies based on the mineralization area and the rich mineralization area. In the main mineralization area, the uranium mineralization thickness is 0-10m, the uranium mineralization grade is 20-100ppm, and the oxidized sand body ratio is 0-40%. In the rich mineralization area, the uranium mineralization thickness is 10-25m, the ore body grade is 100-250ppm, and the oxidized sand body ratio is 0-20%.

10. A quantitative characterization system for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs, implemented using the quantitative characterization method for the relationship between oxidized sand bodies and uranium mineralization in uranium reservoirs as described in any one of claims 1-9, characterized in that, The system includes: The data acquisition module is used to acquire field core logging and borehole information, identify the distribution characteristics of oxide sand bodies in uranium reservoirs, and establish a stratigraphic framework for uranium-bearing rock series. The data statistics module is used to statistically analyze the thickness, ratio, and thickness and grade of sandstone-type uranium mineralization in each borehole layer based on the stratigraphic framework of uranium-bearing rock series. The profile creation module, based on the stratigraphic framework of uranium-bearing rock series, establishes profiles of rock geochemical types and determines the vertical spatial relationship between oxidized sand bodies and uranium mineralization; The planar map generation module is used to generate planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on statistical results and planar drawing software. The spatial configuration module is used to overlay planar distribution maps of uranium reservoir oxide sand body ratio, oxide sand body thickness, uranium mineralization thickness, and uranium mineralization grade based on drawing software, and characterize the spatial configuration relationship between uranium mineralization thickness, uranium mineralization grade, oxide sand body ratio, and oxide sand body thickness by combining the vertical spatial relationship between oxide sand bodies and uranium mineralization. The relational model building module is used to draw scatter plots of the thickness, grade and ratio of uranium mineralization in sandstone-type mineralization to oxidized sand bodies based on statistical results, delineate the main mineralization areas and rich mineralization areas, and establish a quantitative relationship between uranium mineralization and oxidized sand bodies.

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