Methods for judging the zonation and mineralization of oxidation zones in in-situ leaching sandstone-type uranium deposits

Abstract

The present invention discloses a method for studying and judging the zonation and mineralization of oxidation zones of in-situ leaching sandstone-type uranium deposits, including: determining the study area according to indicators such as rock geochemical environment and hydrogeochemical environment, making rock and hydrological environment indicator change curves, determining the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity strength of the target stratum of the uranium deposit, and then determining the position and distribution of the sand body top plate, bottom plate, and upper wing and lower wing of the ore body, and making γ irradiation rate contour map of each stratum; selecting representative trunk sections of the exploration line through rock geochemical environment indicators to make the rock environment indicator change curve of the target stratum; using the oxidation zone of the target stratum to make the oxidation rate contour map of the target stratum; analyzing the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity strength of each zone, and conducting mineralization analysis on the oxidation zone and the ore zone. The present invention can provide a basis for hole layout and predict the oxidation zone front line, and guide the accurate and efficient drilling layout during drilling exploration.

Description

Technical Field

[0001] The invention belongs to the technical field of uranium exploration, and in particular relates to a method for studying and judging the zonation and mineralization of oxidation zones of in-situ leaching sandstone type uranium deposits. Background Art

[0002] Among the various mineralization conditions of in-situ leaching sandstone-type uranium deposits, the epigenetic oxidation alteration zone of the rock (referred to as the oxidation zone) is the most important mineralization condition. The oxidation zone pinch-out position formed by this condition, the front line (including the curl head, upper wing, and lower wing), is the most direct ore-controlling factor. Therefore, only by accurately judging, analyzing and summarizing the strong and weak zoning and mineralization of the oxidation zone can we accurately capture the oxidation zone front line, that is, the redox interface or geochemical barrier, that is, the uranium mineralization enrichment position. The reason why judging and dividing the zoning and mineralization of the oxidation zone runs through the entire process of in-situ leaching sandstone-type uranium mine exploration is that the judgment of the oxidation zone of in-situ leaching sandstone-type uranium deposits is highly valued by those who are looking for in-situ leaching sandstone-type uranium deposits at home and abroad. Whether it is summarizing the mineralization characteristics and mineralization laws, or analyzing the mineralization conditions and mineralization controlling factors, the oxidation zone is taken as the focus, and different degrees of research are carried out according to the corresponding work stage and the mastery of the data. For this reason, the oxidation zone is discussed from different angles in the relevant books and articles published and published at home and abroad. In nuclear industry standards such as "Regional Evaluation of In-situ Leachable Sandstone Uranium Resources at 1:500,000" (EJ / T1161-2002), "Regional Evaluation of In-situ Leachable Sandstone Uranium Resources at 1:250,000" (EJ / T 1160-2002) and "Specifications for Geological Exploration of In-situ Leachable Sandstone Uranium Minerals" (EJ / T 1157-2018), specific requirements are put forward for the oxidation zone, such as "inferring the spatial position of the oxidation-reduction transition zone", "roughly determining the development characteristics, signs, distribution patterns and mineralization of the oxidation zone" and "determining the development degree, alteration characteristics, geochemical characteristics and spatial distribution patterns of each subzone of the oxidation zone".

[0003] However, the research on the zonation and mineralization of the oxidation zone is generally simple and general. As the work progresses, the division of each oxidation zone sub-zone and each mineralization zone sub-zone is not gradually refined. Generally, the distribution area of ​​sandstone that is completely oxidized is blindly classified as the oxidation zone; the distribution area of ​​sandstone with oxidation, reduction and mineralization zones (that is, the various layers cannot be distinguished) is classified as the transition zone (also called the superposition zone); even in the detailed investigation stage of the ore exchange, only the oxidation zone and the transition zone are still delineated. This shows that the zonation of the oxidation zone does not match the actual work stage and degree, and the various original data collected and compiled are defective and incomplete, resulting in the inability to fully utilize the zonation and mineralization of the oxidation zone, and the inability to carry out accurate and efficient drilling layout. Summary of the invention

[0004] The purpose of the present invention is to provide a method for studying and judging the zoning and mineralization of oxidation zones in in-situ leaching sandstone-type uranium deposits, which fully reflects the requirements and standards for the zoning of oxidation zones in different working stages of in-situ leaching sandstone-type uranium deposits, can provide a basis for hole layout and predict the front line of the oxidation zone, and guide the accurate and efficient layout of drilling holes during drilling exploration.

[0005] The technical solution is as follows:

[0006] Methods for determining the zonation and mineralization of oxidation zones in in-situ leaching sandstone-type uranium deposits include:

[0007] Determine the research and judgment area of ​​in-situ leaching sandstone-type uranium deposits according to the hydrogeochemical environmental indicators, and make the hydrological environmental indicator change curve, which includes: the change curve of hydrogen sulfide content in water, the change curve of pH in water, the change curve of redox potential, and the change curve of uranium content in water;

[0008] According to the interpretation results of γ logging of the boreholes in the research area, the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity of the target strata of the uranium deposit are determined, and then the position and distribution of the top and bottom plates of the sand body, as well as the upper wing, lower wing and roll head of the ore body are determined. Based on the weighted average value of the γ irradiation rate thickness of the target strata, the γ irradiation rate contour map of each stratum is drawn to understand the changes in the radioactivity strength and background value of each stratum;

[0009] Obtain rock geochemical environmental indicators through drilling rock cores in the target layer, select representative trunk sections of the exploration line along the oxidation direction, and make rock environmental indicator change curves of the target layer. The rock environmental indicator change curves include: rock specific potential value change curve, low-valent sulfur and organic carbon change curve, and valent iron ratio change curve;

[0010] The oxidation zone of the target layer is determined by using the rock geochemical environmental indicators and the characteristics of the uranium deposit, and the oxidation rate contour map of the target layer is prepared. The oxidation zone is divided into: completely oxidized zone, transition zone, unoxidized zone (reduction zone), the transition zone is divided into: incompletely oxidized subzone, mineralization zone, mineralization zone is divided into: migration subzone, mineralization zone, diffusion subzone, and mineralization zone is divided into: rich mineralization subzone, general mineralization subzone, poor mineralization subzone; the oxidation rate contour lines of different uranium content ranges on the oxidation zone, transition zone, and reduction zone are classified and filled with patterns to form an ideal cross-section schematic diagram along the oxidation direction;

[0011] Analyze the oxidation strength, reduction capacity, stratigraphic structure, lithological phase change and radioactivity strength of each zone, and conduct mineralization analysis on the oxidation zone and mineral zone.

[0012] Furthermore, the method also includes the step of compiling an oxidation zone distribution map, using representative profiles to reflect the vertical changes of the oxidation zone.

[0013] Furthermore, it also includes the step of compiling an oxidation zone characteristic report. By comparing the oxidation zone distribution map and the ideal cross-section diagram along the oxidation direction, the spatial distribution morphology of the oxidation zone, the roof structure, the floor structure, the interlayer development, the thickness variation of the sand body, the difference in sandstone grain size, the degree of loose diagenesis, and the oxidation strength zoning of the oxidation zone are quantified into data and text to form an oxidation zone characteristic report to guide the exploration of uranium mines and carry out accurate and efficient drilling layout.

[0014] Furthermore, according to the different stages of geological work and the degree of control over the corresponding target strata, a scale of appropriate accuracy is selected, the boreholes are mapped and relevant geological parameters are marked, the measured or inferred front lines are connected, and the roll ore bodies located in the unoxidized zone and the wing ore bodies located in the oxidized zone are drawn. The specific ore belts and sub-zones of the oxidized zone are divided, and an oxidized zone distribution map is compiled according to their zonation and mineralization characteristics.

[0015] Furthermore, the geochemical environmental indicators of the rocks sandwiched between the top plate and the bottom plate are used as the basis for zoning; the boundary line between the migration subzone and the incomplete oxidation subzone is used as the front line of the oxidation zone, thereby locking the front position of the oxidation zone.

[0016] Furthermore, the characteristics of uranium deposits are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of uranium deposits include: sand body thickness characteristics, sand content characteristics, and sedimentary system spatial distribution characteristics; the characteristics of oxidation zones are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of oxidation zones include: spatial distribution characteristics and rock geochemical environment characteristics; the proportion of high-altitude uranium in uranium ore is judged based on uranium deposit characteristics, oxidation zone characteristics, and high-contrast geochemical reduction barriers.

[0017] Furthermore, the degree of uranium enrichment was determined based on the positive correlation between pyrite and uranium.

[0018] Furthermore, the high-contrast geochemical reduction barrier has a controlling effect on the high-square-meter uranium content, which is affected by the rock specific potential value, low-valent sulfur and organic carbon content, and valent iron ratio.

[0019] Furthermore, the oxidation rate of the drilled rock core clamped between the roof and floor plates is used to divide the oxidation zone and the mineral zone into different stages and degrees accordingly.

[0020] The technical effects of the present invention include:

[0021] In the present invention, the method for determining the zonation and mineralization of the oxidation zone is to use the rock geochemical environmental indicators and uranium deposit characteristics of the oxidation zone in each stage to divide the oxidation zone and transition zone into different working stages and different working degrees. The indicators for the division of each sub-zone are clear, comprehensive, systematic, practical and feasible. Compared with the prior art, it has obvious integrity, practicality and scientificity, fully reflects the requirements and standards for the zonation division of the oxidation zone in different working stages of in-situ leaching sandstone-type uranium mines, can provide a basis for hole layout and predict the front line of the oxidation zone, and guide the accurate and efficient layout of drilling holes during drilling exploration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an ideal model diagram of oxidation zone zonation and mineralization of in-situ leaching sandstone type uranium ore in the present invention. DETAILED DESCRIPTION

[0023] The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce the invention.

[0024] like Figure 1 As shown, it is an ideal model diagram of oxidation zone zonation and mineralization of in-situ leaching sandstone type uranium ore in the present invention.

[0025] The specific steps of the method for determining the zonation and mineralization of oxidation zones in in-situ leaching sandstone-type uranium deposits are as follows:

[0026] Step 1: Determine the research and judgment area of ​​in-situ leaching sandstone-type uranium deposits according to the hydrogeochemical environmental indicators, and make a hydrological environmental indicator change curve, which includes: a change curve of hydrogen sulfide content (H2S) in water, a change curve of pH in water, a change curve of redox potential (Eh), and a change curve of uranium content in water;

[0027] The degree of uranium enrichment is determined based on the positive correlation between pyrite and uranium. The output of uranium minerals is closely related to pyrite and organic carbon, which is mainly distributed at the edge or middle of pyrite. 34 S) analysis shows that the δ 34 S ranges from -35.8‰ to -28.7‰, all of which are negative values ​​with a small range of variation, indicating that the sulfur in pyrite should come from bacterial sulfate reduction. Uranium minerals were found in strawberry-shaped pyrite and plant debris cavities under the microscope, indicating that there is an obvious biological effect in the mineralization process of uranium, generating lighter reducing gas H2 32 S, causing the pH value and Eh (redox potential) of the environment to decrease, and the U in groundwater 6+ and Fe dissolved in water 2+ Compared with the lighter H2 32The S gas undergoes an oxidation-reduction reaction, forming a close association of pyrite and uranium ore. The more pyrite there is, the higher the content of uranium minerals generated.

[0028] Step 2: According to the gamma logging interpretation results of the boreholes in the research area, determine the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity strength of the target strata of the uranium deposit, and then determine the location and distribution of the sand body roof, floor, upper wing, lower wing and roll head of the ore body. According to the weighted average value of the gamma irradiation rate thickness of the target strata, draw the gamma irradiation rate contour map of each stratum to understand the radioactivity strength changes and background values ​​of each stratum;

[0029] The thickness-weighted average value of the γ irradiation rate of each target layer in the drilling area is calculated as nC·kg / h, and the γ irradiation rate contour map of each layer is compiled. The γ irradiation rate contour map shows the changes in radioactivity intensity and background value of each layer.

[0030] The gamma logging curves of the target layers of each borehole in the assessment area were magnified (1-5 nC·kg / h per centimeter), the extreme peaks were cut off and the maximum values ​​were marked, and the morphology of the gamma logging curves and the mineralization were classified and studied according to the single and double peak values ​​of the roof and floor.

[0031] Step 3: Obtain rock geochemical environmental indicators through drilling rock cores in the target layer, select representative trunk sections of the exploration line along the oxidation direction, and make rock environmental indicator change curves of the target layer in the thickness and width directions. The rock environmental indicator change curves include: rock specific potential value (△Eh) change curve, low-valent sulfur (S 2- ) and organic carbon (C 有 ) content change curve, valence iron ratio (Fe 3+ / Fe 2+ ) Change curve;

[0032] The river channel of the second sublayer of the Saihan Formation in the Hadattu uranium deposit is wide and shallow, with a small curvature and a relatively developed river channel. The high-meter uranium ore body is mainly located between the river channels. The sand body in this area is thinner, with a thickness of 58 to 77 meters and good connectivity. The sand content is lower than that of the river channel, with a sand content of 81.8% to 89.5%. There are 3 to 4 layers of mudstone aquicludes in the sand body, which reduces the flow rate of oxygen-containing uranium-containing water to a certain extent and weakens the oxidation of the formation, so that the reducing medium in the formation is not oxidized, and the U in the fluid is not oxidized. 6+ Fully react with the reducing medium to continuously generate U 4+, gradually enriched to form uranium ore bodies. The surrounding rocks of the ore deposits are generally coarse in particle size and relatively large in porosity, while the ore is mainly medium-fine-grained sandstone with relatively fine particle size. The clay content in the filling material is nearly 5 times that of the surrounding rock, and the porosity is relatively small, which can slow down the influx of oxygen-containing and uranium-containing fluids to a certain extent, allowing them to fully contact with the reducing medium. Therefore, the area between the heart bar and the heart bar provides a favorable occurrence space for high-square-meter uranium ore bodies. The heterogeneous factors in this area, such as sand body thickness, sand content, mudstone aquiclude, sand body particle size, clay content, etc., control the output of high-square-meter uranium ore bodies.

[0033] Under the long-term action of underground oxygen-containing water, the rock geochemical environment of the upper part of the Saihan Formation in the Hadatuo area has obvious zonation in the oxidation zone, oxidation-reduction transition zone (ore zone), and reduction zone, and changes regularly. 2- ), organic carbon (C 有 ) is the highest in the transition zone, indicating that its reducing ability is the strongest. △Eh can better reflect the redox ability of rocks, and its zoning is obvious. From oxidation zone → reduction zone → reduction transition zone (ore zone), △Eh gradually increases. The average △Eh of the second sub-layer oxidation zone is 15mv, the average △Eh of the reduction zone is 31mv, and the average △Eh of the transition zone gray sandstone (ore) is 49mv. This zone has strong reducing ability. 2- The content is lower in the oxidation zone sandstone, averaging 0.01%, while it is higher in the transition zone gray sandstone and reduction zone gray rock. 2- Content 0.33%, S in ore 2- The average value is 1.79%. This is consistent with the fact that pyrite is not developed in the sandstone and sandy conglomerate in the oxidation zone, while the pyrite content in the gray sandstone and ore in the reduction zone and transition zone is high, which also shows that uranium mineralization is closely related to pyrite. 有 The content of C can also reflect the strength of the fluid oxidation ability. 有 The average is 0.05%, the average in the reduction zone is 0.11%, and the gray and gray-black sandstone in the transition zone (ore) is higher, averaging 0.12%; the overall C in the oxidation zone is 有 The low content indicates that the organic debris has undergone post-oxidation and the organic matter and charcoal have been significantly reduced.

[0034] High-contrast geochemical reduction barriers have a controlling effect on high-level uranium content. The high-level uranium content of the ore body is mainly controlled by favorable ore-bearing space and large-scale oxidation zones, as well as high-contrast geochemical reduction barriers. High-level uranium content is inevitably affected by △Eh, Fe 2+ , S 2- and C 有 The influence of factors such as content.

[0035] During the runoff process, the underground oxygen-containing uranium-containing fluid will inevitably undergo redox reactions with the reducing media in the formation, converting U 6+ Reduction enrichment, whether the stratum can be oxidized depends on the permeability of the clastic rock on the one hand, and on the reduction strength of the reducing medium on the other hand. The high-level uranium ore body in the northern Hadattu is produced in the transitional part of the two heart beaches. The ore-bearing rock color is darker or "black" than the surrounding rock. A large amount of carbonized plant debris and pyrite are developed. The carbonized plant debris is in a mass and layered distribution (thickness 5-10cm). There are a large number of fine-crystalline and colloidal pyrites in the carbonized plant cavity and surface. Tuberculosis and columnar pyrites are also common in high-level uranium ore, and the grade of the ore sample analysis is 6.7%. According to statistics, the content of organic matter and pyrite reducing media in the primary gray sandstone of the Hadattu uranium deposit is 5-23 times higher than that of the surrounding rock, which enhances the reduction ability of the gray sandstone and can reduce and precipitate a large amount of uranium to form a high-level uranium ore body. Therefore, the high-contrast geochemical reduction barrier is a crucial controlling factor for the high-level uranium content of the ore body.

[0036] Step 4: Determine the oxidation zone of the target horizon using rock geochemical environmental indicators and uranium deposit characteristics, and make oxidation rate contour maps of the target horizon along the thickness and breadth directions according to the degree of ore oxidation. Divide the target horizon along the breadth direction into: oxidation zone, transition zone (or oxidation-reduction transition zone), reduction zone (or unoxidized zone), divide the transition zone into: incomplete oxidation subzone, mineralization zone, mineralization zone into: migration subzone (mineralization zone of uranium migration), mineralization zone, diffusion subzone (abnormal zone of uranium diffusion), divide the mineralization zone into: rich ore subzone, general ore subzone, poor ore subzone; classify the oxidation rate contour lines of different uranium content ranges on the oxidation zone, transition zone, and reduction zone and fill the pattern to form an ideal profile schematic diagram along the oxidation direction;

[0037] The background uranium content in the unoxidized zone contains unoxidized authigenic pyrite, marcasite, siderite and other divalent iron minerals to varying degrees; even during the rock-forming and mineralization processes, there are reducing media such as oil, gas and coal-bed methane from other places through faults or groundwater activity.

[0038] The uranium content in the ore belt is several times higher than the background uranium content. The uranium is mostly dispersed in microcrystals and occurs between or among particles of pyrite, charcoal and quartz, and is often in an adsorbed state. Uranium minerals such as pitchblende, black uranium and uraninite can be seen in high-grade ores. In addition to authigenic pyrite, marcasite, siderite and other divalent iron minerals, there are also pyrite and siderite generated later in the mineralization process. Quartz particles are mostly smoky gray or black due to radioactive irradiation.

[0039] The interlayer oxidation zone is lower than the background uranium content. The oxidation referred to here refers specifically to epigenetic oxidative alteration, which is commonly known as the oxidation zone. The larger the scale of the oxidation zone, the more uranium is activated; it can be divided into two subzones, complete and incomplete, according to the strength of oxidation. Among them, the complete subzone has a larger range, obvious characteristics, and is easy to identify; complete oxidation is a manifestation of strong oxidation, and the divalent iron minerals dispersed in the sandstone are completely oxidized to trivalent iron minerals such as limonite or hematite; dark minerals such as feldspar, biotite, and magnetite are mostly oxidized, and the overall color is epigenetic bright yellow or rose red (iron-deficient sandstone is primary white and grayish white). Incomplete oxidation is a manifestation of strong oxidation, and different degrees of primary gray are retained in the oxidation tone. Although disulfide and divalent iron carbonate are basically oxidized, there are unoxidized minerals such as hydroaluminosilicate. Partial oxidation is a manifestation of weak oxidation, and different degrees of oxidation spots, patches, and stripes are developed in the primary gray tone.

[0040] The oxidation rate (% of oxidized sandstone thickness / total sandstone thickness × 100%) of each target layer in the drilling area is statistically analyzed, and the oxidation rate contour map of each layer on the target layer is compiled to understand the oxidation strength trend and quantitative data of each layer. The oxidation rate of the drilled rock core sandwiched between the roof and the floor is used to divide the oxidation zone and the mineral zone into different stages and degrees.

[0041] The characteristics of uranium deposits are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of uranium deposits include: sand body thickness characteristics, sand content characteristics, and sedimentary system spatial distribution characteristics; the characteristics of oxidation zones (ore-bearing space) are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of oxidation zones include: spatial distribution characteristics and rock geochemical environment characteristics; the proportion of high-altitude uranium in uranium ore is judged based on uranium deposit characteristics, oxidation zone characteristics, and high-contrast geochemical reduction barriers.

[0042] The rock environmental index sample information (ΔEh, Cy, S 2- etc.) as the basis for zoning; the boundary line between the migration subzone and the incomplete oxidation subzone is taken as the front line of the oxidation zone, thereby locking the front position of the oxidation zone.

[0043] Step 5: Analyze the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity strength of each zone, and conduct mineralization analysis on the oxidation zone and mineral zone;

[0044] Step 6: Prepare an oxidation zone distribution map.

[0045] According to the different stages of geological work and the degree of control over the corresponding target horizon, a scale of appropriate accuracy is selected, the boreholes are mapped and the relevant geological parameters are marked, the measured or inferred front lines are connected, and the roll ore bodies in the unoxidized zone and the wing ore bodies in the oxidized zone are drawn. The specific ore belts and sub-zones of the oxidized zone are divided, and the oxidized zone distribution map is compiled according to their zonation and mineralization characteristics. At the same time, the oxidation rate contour map is used to reflect the vertical changes of the oxidized zone.

[0046] Step 7: Prepare a report on the characteristics of the oxidation zone.

[0047] By comparing the oxidation zone distribution map and the ideal profile diagram along the oxidation direction, the spatial distribution morphology of the oxidation zone, the roof structure, the floor structure, the interlayer development, the thickness changes of the sand body, the difference in sandstone grain size, the degree of loose diagenesis, the strong and weak oxidation zoning, etc. are quantified into data and text to form an oxidation zone characteristic report to guide the exploration of uranium mines and carry out accurate and efficient drilling layout.

[0048] The terms used in the present invention are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore, characterized in that: include: Determine the research and judgment area of ​​in-situ leaching sandstone-type uranium deposits according to the hydrogeochemical environmental indicators, and make the hydrological environmental indicator change curve, which includes: the change curve of hydrogen sulfide content in water, the change curve of pH in water, the change curve of redox potential, and the change curve of uranium content in water; According to the gamma logging interpretation results of the boreholes in the research area, the oxidation strength, reduction capacity, stratigraphic structure, lithologic phase change and radioactivity strength of the target strata of the uranium deposit are determined, and then the position and distribution of the sand body roof, floor, upper wing, lower wing and roll head of the ore body are determined. According to the weighted average value of the gamma irradiation rate thickness of the target strata, the gamma irradiation rate contour map of each stratum is made to understand the radioactivity strength change and background value of each stratum; the rock geochemical environmental indicators are obtained through the core of the drilled rock in the target stratum, and the representative trunk section of the exploration line is selected along the oxidation direction. The rock environmental indicator change curve of the target stratum is made in the thickness and breadth direction. The rock environmental indicator change curve includes: rock specific potential value change curve, low-valent sulfur and organic carbon change curve, and valent iron ratio change curve; The oxidation zone of the target layer is determined by using the rock geochemical environmental indicators and the characteristics of the uranium deposit. The oxidation rate contour map of the target layer is made along the thickness and width directions according to the degree of ore oxidation. The oxidation zone is divided into: completely oxidized zone, transition zone, unoxidized zone (reduction zone), the transition zone is divided into: incompletely oxidized subzone, mineralization zone, mineralization zone is divided into: migration subzone, mineralization zone, diffusion subzone, mineralization zone is divided into: rich ore subzone, general ore subzone, poor ore subzone; the oxidation rate contour lines of different uranium content ranges on the oxidation zone, transition zone, and reduction zone are classified and filled with patterns to form an ideal cross-section schematic diagram along the oxidation direction; Analyze the oxidation strength, reduction capacity, stratigraphic structure, lithological phase change and radioactivity strength of each zone, and conduct mineralization analysis on the oxidation zone and mineral zone.

2. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: It also includes the step of compiling an oxidation zone distribution map, using representative profiles to reflect the vertical changes of the oxidation zone.

3. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 2, characterized in that: It also includes the steps of compiling an oxidation zone characteristic report. By comparing the oxidation zone distribution map and the ideal profile diagram along the oxidation direction, the spatial distribution morphology of the oxidation zone, the roof structure, the floor structure, the development of interlayers, the thickness changes of sand bodies, the differences in sandstone grain size, the degree of loose diagenesis, and the strength of oxidation zoning are quantified into data and text to form an oxidation zone characteristic report to guide the exploration of uranium mines and carry out accurate and efficient drilling layout.

4. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 2, characterized in that: According to the different stages of geological work and the degree of control over the corresponding target strata, a scale of appropriate accuracy is selected, the boreholes are mapped and relevant geological parameters are marked, the measured or inferred front lines are connected, and the roll ore bodies located in the unoxidized zone and the wing ore bodies located in the oxidized zone are drawn. The specific ore belts and sub-zones of the oxidized zone are divided, and an oxidized zone distribution map is compiled according to their zonation and mineralization characteristics.

5. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: The geochemical environmental indicators of the rocks sandwiched between the roof and the floor are used as the basis for zoning; the boundary line between the migration subzone and the incomplete oxidation subzone is used as the front line of the oxidation zone, thereby locking the front position of the oxidation zone.

6. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: The characteristics of uranium deposits are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of uranium deposits include: sand body thickness characteristics, sand content characteristics, and sedimentary system spatial distribution characteristics; the characteristics of oxidation zones are used as the basis for distinguishing the existence of high-altitude uranium in uranium deposits. The characteristics of oxidation zones include: spatial distribution characteristics and rock geochemical environment characteristics; the proportion of high-altitude uranium in uranium ore is judged based on uranium deposit characteristics, oxidation zone characteristics, and high-contrast geochemical reduction barriers.

7. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: The degree of uranium enrichment is determined based on the positive correlation between pyrite and uranium.

8. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: The high-contrast geochemical reduction barrier has a controlling effect on the high-square-meter uranium content, which is affected by the rock specific potential value, low-valent sulfur and organic carbon content, and valent iron ratio.

9. The method for determining the oxidation zone zonation and mineralization of in-situ leaching sandstone-type uranium ore according to claim 1, characterized in that: The oxidation rate of the drilled rock core clamped between the roof and floor plates is used to divide the oxidation zone and the mineral zone into different stages and degrees.

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