Method and device for determining the alteration zoning of the ore-bearing layer of sandstone-type uranium deposits

Abstract

The embodiments of this application relate to the field of material or object detection, specifically to a method and apparatus for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits. The embodiments of this application obtain core samples at different depths as raw materials for acquiring mineral composition and alteration type combinations, major elements, trace elements, and organic carbon. By determining the mineral composition and alteration type combinations of core samples at different sampling depths, the geological conditions and evolution process corresponding to each core sample's sampling depth can be assessed. By acquiring and analyzing the major elements, trace elements, and organic carbon of each core sample, the patterns of elemental geochemical changes in core samples at different sampling depths can be determined. Finally, based on the mineral composition, alteration type combinations, and elemental chemical changes, the alteration zoning of core samples at different sampling depths can be determined, thereby identifying the alteration zoning of the ore-bearing strata and contributing to improved exploration accuracy.

Description

Technical Field

[0001] The embodiments of this application relate to the field of substance or object detection, specifically to a method and apparatus for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Sandstone-type uranium deposits are an important type of uranium deposit in my country. Exploration personnel usually analyze the alteration zoning of the ore-bearing strata of uranium deposits based on the principles of mineralization in order to find new sandstone-type uranium deposits.

[0004] However, the alteration zoning of sandstone-type uranium deposits formed by different mineralization processes is different, and the current methods for determining the alteration zoning of sandstone-type uranium deposits still have shortcomings. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a method for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits, comprising the following steps: S10: obtaining core samples of sandstone-type uranium deposits at different sampling depths; S20: determining the mineral composition and alteration type combination of core samples at different sampling depths based on the core samples; S30: determining the major elements, trace elements, and organic carbon of the core samples, and determining the elemental geochemical changes of core samples at different sampling depths based on the major elements, trace elements, and organic carbon of the core samples; S40: determining the alteration zoning of the ore-bearing strata based on the mineral composition and alteration type combination determined in step S20 and the elemental geochemical changes determined in step S30.

[0007] The embodiments of this application obtain core samples at different depths as raw materials for acquiring mineral composition and alteration type combinations, major elements, trace elements, and organic carbon. By determining the mineral composition and alteration type combinations of core samples at different sampling depths, the geological conditions and evolution process corresponding to each core sample's sampling depth can be judged. By acquiring and analyzing the major elements, trace elements, and organic carbon of each core sample, the pattern of elemental geochemical changes in core samples at different sampling depths can be determined. Finally, based on the mineral composition, alteration type combinations, and elemental chemical changes, the alteration zoning of core samples at different sampling depths can be determined, thereby identifying the alteration zoning of ore-bearing strata and helping to improve the accuracy of exploration.

[0008] Secondly, embodiments of this application provide an apparatus for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits, comprising: a sampling unit, an information acquisition unit, an elemental analysis unit, and a data processing unit; the sampling unit is configured to acquire core samples from sandstone-type uranium deposits at different depths; the information acquisition unit is configured to determine the mineral composition and alteration type combination of core samples at different sampling depths based on the core samples; the elemental analysis unit is configured to determine the major elements, trace elements, and organic carbon of the core samples, and to determine the elemental geochemical changes of core samples at different sampling depths based on the major elements, trace elements, and organic carbon of the core samples; the data processing unit is configured to determine the alteration zoning of ore-bearing strata in sandstone-type uranium deposits based on the mineral composition, alteration type combination, and elemental geochemical changes of core samples at different sampling depths.

[0009] The embodiments of this application obtain core samples at different depths using a sampling device as raw materials for acquiring mineral composition and alteration type combinations, major elements, trace elements, and organic carbon. An information acquisition device determines the mineral composition and alteration type combinations of the core samples, enabling the assessment of the geological conditions and evolution process at each sampling depth. An elemental analysis device acquires and analyzes the major elements, trace elements, and organic carbon of each core sample, determining the patterns of elemental geochemical changes at different sampling depths. Finally, a data processing device, based on the mineral composition, alteration type combinations, and elemental chemical changes, determines the alteration zoning of core samples at different sampling depths, thereby identifying the alteration zoning of ore-bearing layers and improving the accuracy of exploration. Attached Figure Description

[0010] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0011] Figure 1This is a schematic diagram of core samples at different depths obtained by the method provided in the embodiments of this application.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding.

[0013] Explanation of reference numerals in the attached figures: 1. Bright red sandstone; 2. Light red sandstone; 3. Grayish red sandstone; 4. Gray sandstone. Detailed Implementation

[0014] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0015] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0016] In existing technologies, when searching for sandstone-type uranium deposits, the ore-bearing layer is usually found based on the interlayer oxidation zone. The ore-bearing layer of sandstone-type uranium deposits has an oxidation zone, a redox transition zone, and a reduction zone in the vertical direction. Uranium is enriched and formed into ore near the redox transition zone.

[0017] However, sandstone-type uranium deposits formed by uranium leaching mineralization do not exhibit traditional alteration zoning, and their ore-bearing strata are not controlled by redox transition zones. Therefore, determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits formed by uranium leaching mineralization is of great significance for determining the exploration of this type of uranium deposit. Currently, there is no method applicable to determining the alteration zoning of ore-bearing strata in this type of uranium deposit.

[0018] To address the aforementioned problems, embodiments of this application provide a method for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits, comprising the following steps: S10: obtaining core samples of sandstone-type uranium deposits at different sampling depths; S20: determining the mineral composition and alteration type combinations of core samples at different sampling depths based on the core samples; S30: determining the major elements, trace elements, and organic carbon of the core samples, and determining the elemental geochemical changes of core samples at different sampling depths based on the major elements, trace elements, and organic carbon of the core samples; S40: determining the alteration zoning of the ore-bearing strata based on the mineral composition and alteration type combinations determined in step S20 and the elemental geochemical changes determined in step S30.

[0019] See Figure 1 , Figure 1 This is a schematic diagram of core samples at different depths obtained by the method provided in the embodiments of this application. Figure 1 The illustrations show core samples of different colors obtained from different depths, including bright red sandstone 1, light red sandstone 2, grayish-red sandstone 3, and gray sandstone 4. Embodiments of this application obtain core samples from different depths as raw materials for acquiring mineral composition and alteration type combinations, major elements, trace elements, and organic carbon. By determining the mineral composition and alteration type combinations of core samples from different sampling depths, the geological conditions and evolution process corresponding to each core sample's sampling depth can be assessed. By obtaining and analyzing the major elements, trace elements, and organic carbon of each core sample, the patterns of elemental geochemical changes in core samples from different sampling depths can be determined. Finally, based on the mineral composition, alteration type combinations, and elemental chemical changes, the alteration zoning of core samples from different sampling depths can be determined, thereby identifying the alteration zoning of ore-bearing strata and contributing to improved exploration accuracy.

[0020] In some embodiments, in step S20, a polarizing microscope can be used to determine the mineral composition and alteration type combination of the core sample based on the sample. By using a polarizing microscope, the core sample can be carefully observed to obtain its mineral characteristics and alteration type characteristics, thereby determining the mineral composition and alteration type combination of the core sample.

[0021] In some embodiments, S30 may further include the following step: S31: Determine the major elements of the core sample, and based on the major elements of the core sample, determine the Fe content of core samples at different sampling depths. 3+ and Fe 2+The ratio change trend; S32: Determine the trace elements in the core sample, and based on the trace elements in the core sample, determine the content change trends of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel in the core sample at different sampling depths; S33: Determine the organic carbon in the core sample, and based on the organic carbon in the core sample, determine the content change trend of organic carbon in the core sample at different sampling depths; S34: Based on Fe 3+ and Fe 2+ The trends in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the trends in the organic carbon content, were studied to determine the elemental geochemical variations in core samples taken at different sampling depths.

[0022] In the mineralization process of sandstone-type uranium deposits formed by uranium seepage, the ore-forming fluids originate from deep organic-rich formations or hydrocarbon source rocks, and are rich in organic matter. The highly reducing ore-forming fluids migrate to oxidative sedimentary formations and undergo reduction alteration. Simultaneously, ore-forming elements such as uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel migrate along with the highly reducing ore-forming fluids to the oxidative sedimentary formations, and are deposited due to changes in temperature, pressure, pH, and other conditions. Therefore, Fe... 3+ and Fe 2+ The trends in the ratios of Fe, the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, and the organic carbon content all help to indicate the redox properties of core samples. By determining the Fe content... 3+ and Fe 2+ By studying the trends in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the trends in the organic carbon content, we can determine the elemental geochemical changes in core samples from different sampling depths. This helps to jointly determine the redox properties of core samples from multiple perspectives, quantify the degree of redox in core samples, and thus determine the alteration zoning of ore-bearing strata.

[0023] In some embodiments, in step S40, the alteration zoning of the ore-bearing strata may include primary oxidation zones, weak reduction zones, intermediate reduction zones, and fully reduction zones. Since uranium mineralization is often hosted in gray sandstone 4 and occasionally in reddish-brown sandstone, determining the alteration zoning of the sandstone hosting uranium mineralization by identifying the primary oxidation zone, weak reduction zone, intermediate reduction zone, and fully reduction zone helps to identify favorable uranium-forming areas and improve exploration accuracy.

[0024] In some embodiments, the mineral composition and alteration type can be combined to contain a large amount of hematite, lack black organic matter, and have an elemental geochemical change to Fe. 3+ and Fe 2+The ratio is the highest, confirming the primary oxidation zone. Because the organic-rich, highly reducing ore-forming fluids altered the oxidation formations, producing reduced sandstone, the mineral composition and alteration type combination indicates a high content of hematite and a lack of black organic matter. This visually confirms that the core sample location was not altered by the reducing ore-forming fluids. Based on the elemental geochemical changes, it is Fe... 3+ and Fe 2+ The ratio is the highest, which can be used to further determine the degree of reduction modification through quantification, making the determination of the original oxidation zone without reduction modification more accurate.

[0025] In some embodiments, the mineral composition and alteration type can be combined to have a hematite content lower than the primary oxidation zone and no black organic matter; the elemental geochemical change is Fe. 3+ and Fe 2+ The ratio shows a decreasing trend, and the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are slightly higher than in the primary oxidation zone, identifying a weak reduction zone. Based on the lower hematite content compared to the primary oxidation zone, it can be determined that the sampling location of the core sample underwent reduction modification. According to the elemental geochemical changes, Fe... 3+ and Fe 2+ The ratio of these elements shows a decreasing trend. The contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are slightly higher than those of the primary oxide zone. This allows for further quantification to determine the degree of reduction modification, making the identification of the weak reduction zone more accurate.

[0026] In some embodiments, a moderately reducing zone can be identified based on the combination of mineral composition and alteration type, characterized by low hematite content, small amounts of ferrodolomite, pyrite, and black organic matter; and an increasing trend in the content of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel. The presence of small amounts of ferrodolomite, pyrite, and black organic matter in the mineral composition and alteration type combination indicates that the sampling location of the core sample has undergone significant reduction alteration. Furthermore, the increasing trend in the content of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel through elemental geochemical alteration allows for further quantification to determine the degree of reduction alteration, thus making the identification of the moderately reducing zone more accurate.

[0027] In some embodiments, based on the mineral composition and alteration type, the minerals are almost entirely devoid of hematite, rich in ferrodolite, barite, black organic matter, and pyrite; the elemental geochemical change is Fe. 3+ and Fe 2+ The ratio of [unspecified element] is the lowest, while the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are the highest, confirming a completely reduced zone. Based on the mineral composition and alteration type, it is almost devoid of hematite, rich in ferrodolite, barite, black organic matter, and pyrite; it can be determined that the sampling location of the core sample was completely reduced and altered, further confirmed by elemental geochemical changes to Fe [unspecified element]. 3+ and Fe2+ The ratio is the lowest, while the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are the highest. This allows for further quantification to determine the degree of reduction and modification, making the identification of the complete reduction zone more accurate.

[0028] Embodiments of this application also provide an apparatus for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits. This apparatus may include: a sampling unit, an information acquisition unit, an elemental analysis unit, and a data processing unit. The sampling unit is configured to acquire core samples from sandstone-type uranium deposits at different depths. The information acquisition unit is configured to determine the mineral composition and alteration type combinations of core samples from different sampling depths based on the core samples. The elemental analysis unit is configured to determine the major elements, trace elements, and organic carbon of the core samples, and, based on these elements, determine the elemental geochemical variations of core samples from different sampling depths. The data processing unit is configured to determine the alteration zoning of ore-bearing strata in sandstone-type uranium deposits based on the mineral composition, alteration type combinations, and elemental geochemical variations of core samples from different sampling depths.

[0029] The embodiments of this application obtain core samples at different depths using a sampling device as raw materials for acquiring mineral composition and alteration type combinations, major elements, trace elements, and organic carbon. An information acquisition device determines the mineral composition and alteration type combinations of the core samples, enabling the assessment of the geological conditions and evolution process at each sampling depth. An elemental analysis device acquires and analyzes the major elements, trace elements, and organic carbon of each core sample, determining the patterns of elemental geochemical changes at different sampling depths. Finally, a data processing device, based on the mineral composition, alteration type combinations, and elemental chemical changes, determines the alteration zoning of core samples at different sampling depths, thereby identifying the alteration zoning of ore-bearing layers and improving the accuracy of exploration.

[0030] In some embodiments, the elemental analyzer can be configured to determine the major elements of a core sample, and based on the major elements, determine the Fe content of core samples at different sampling depths. 3+ and Fe 2+ Content variation trends; determining trace elements in core samples, and based on the trace elements in the core samples, determining the content variation trends of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel in core samples from different sampling depths; and determining the organic carbon content in core samples, and determining the organic carbon content variation trends in core samples from different sampling depths; based on Fe... 3+ and Fe 2+ The trends in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the trends in the organic carbon content, were studied to determine the elemental geochemical variations in core samples taken at different sampling depths.

[0031] In the mineralization process of sandstone-type uranium deposits formed by uranium seepage, the ore-forming fluids originate from deep organic-rich formations or hydrocarbon source rocks, and are rich in organic matter. The highly reducing ore-forming fluids migrate to oxidative sedimentary formations and undergo reduction alteration. Simultaneously, ore-forming elements such as uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel migrate along with the highly reducing ore-forming fluids to the oxidative sedimentary formations, and are deposited due to changes in temperature, pressure, pH, and other conditions. Therefore, Fe... 3+ and Fe 2+ The trends in the ratios of Fe, the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, and the organic carbon content all help to indicate the redox properties of core samples. By determining the Fe content... 3+ and Fe 2+ By studying the trends in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the trends in the organic carbon content, we can determine the elemental geochemical changes in core samples from different sampling depths. This helps to jointly determine the redox properties of core samples from multiple perspectives, quantify the degree of redox in core samples, and thus determine the alteration zoning of ore-bearing strata.

[0032] Furthermore, the methods provided in the embodiments of this application will be described in detail.

[0033] Drilling was conducted at the Hailijin uranium deposit in the Songliao Basin. (See also) Figure 1 Core samples were obtained from different depths of the ore-bearing layer.

[0034] Observation of core samples revealed that the lower section of the Yaojia Formation, the ore-bearing stratum of the Hailijin uranium deposit in the Songliao Basin, is mainly composed of braided river deposits. The ore-bearing sandstones exhibit a positive rhythmic sedimentary cycle with coarse lower layers and fine upper layers. The sandstone colors mainly include bright red, light red, grayish red, grayish yellow, and grayish white.

[0035] Core samples were observed under a polarizing microscope to determine the mineral composition and alteration type combination of core samples from different sampling depths.

[0036] Table 1. Mineral composition and alteration type combination of core samples See Table 1, which shows the mineral composition and alteration type combination of the core sample determined by the method provided in the embodiments of this application.

[0037] As shown in Table 1, the Yaoxia section of the ore-bearing stratum has six different colored core samples. According to the rock types marked at the top of Table 1, they are bright red sandstone 1, light red sandstone 2, grayish red sandstone 3, grayish yellow sandstone, gray sandstone 4, and ore.

[0038] Table 1 lists the mineral types and alteration types on the left, numbered with numbers. The mineral types include numbers 1-5: 1 is hematite, 2 is limonite, 3 is ferrodolithite, 4 is calcite, and 5 is pyrite. The alteration types include numbers 6-9: 6 is kaolinization, 7 is illite, 8 is illite-montmorillonite mixed layer, and 9 is barite alteration.

[0039] Table 1 uses different colored areas to represent the proportion of each mineral type and alteration type in core samples of different colors.

[0040] Table 1 below shows the mineral composition and alteration type combination corresponding to each rock type. The numbers in the table represent the mineral types and alteration types that each rock type has. The numbers are arranged according to the proportion of each mineral type and alteration type, as follows.

[0041] Among them, the altered mineral assemblage of bright red sandstone 1 is characterized by abundant hematite, a small amount of limonite and calcite, with kaolinization, illiteization and illite-montmorillonite mixed layering, and is mainly characterized by abundant hematite, without organic matter.

[0042] The altered mineral assemblage of light red sandstone 2 consists of limonite, hematite, and calcite, exhibiting kaolinization, illiteization, and illite-montmorillonite mixing. The hematite content is lower than that of bright red sandstone 1, and it does not contain black organic matter.

[0043] The alteration mineral assemblage of the gray-red sandstone 3 and gray-yellow sandstone consists of hematite, limonite and calcite, with minor ferrodolithization, minor pyrite alteration, kaolinization, illite alteration and illite-montmorillonite mixing, and occasional black organic matter. The hematite content is lower than that of the light red sandstone 2.

[0044] The alteration mineral assemblage of gray sandstone 4 and grayish-white sandstone consists of abundant iron dolomite, pyrite, and barite, exhibiting kaolinization, illiteization, and illite-montmorillonite mixing. It is characterized by abundant pyrite and barite, with a significantly increased kaolinite content, and also contains a large amount of black organic matter.

[0045] The alteration mineral assemblage of the ore is similar to that of gray sandstone 4.

[0046] Furthermore, elemental analysis was performed on the core samples to determine the major elements, trace elements, and organic carbon. Based on the major elements, the Fe content of the core samples was determined. 3+ and Fe 2+ The ratio variation trend; based on the trace elements in the core samples, determine the variation trend of the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt and nickel in the core samples; and based on the organic carbon in the core samples, determine the variation trend of the organic carbon content in the core samples; based on the variation trend, determine the elemental geochemical changes of core samples at different sampling depths.

[0047] In core samples from the Yaoxia section of the Hailijin uranium deposit, including bright red sandstone 1, light red sandstone 2, grayish-red sandstone 3, yellowish-brown sandstone, gray sandstone 4, and grayish-green sandstone, Fe... 3+ and Fe 2+ The ratio of [elements] shows a decreasing trend, while the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel show an increasing trend. The contents of organic carbon and sulfur also show an increasing trend.

[0048] Furthermore, based on the mineral composition, alteration type combination, and elemental geochemical changes, the alteration zoning of the ore-bearing strata in sandstone-type uranium deposits was determined.

[0049] Table 2 Alteration zoning of ore-bearing strata in sandstone-type uranium deposits See Table 2, which shows the alteration zoning of sandstone-type uranium deposits determined by the method provided in the embodiments of this application.

[0050] See Table 2. From left to right, Table 2 presents the lithological columnar section, alteration zoning, lithological characteristic description, and corresponding typical rock photographs. From top to bottom, Table 2 shows gray sandstone 4 and grayish-white sandstone, grayish-red sandstone 3 and grayish-yellow sandstone, light red sandstone 2 and bright red sandstone 1.

[0051] Table 2 shows that, based on the primary oxidation formation, the core samples are mainly composed of interbedded bright red medium-fine sandstone and fine sandstone with a small amount of red conglomerate of varying thickness. The cementation is loose, and the permeability is good. The mineral composition and alteration type assemblage are rich in hematite, with clay minerals mainly consisting of kaolinite, illite-saturated mixed layers, and illite. Pyrite and black organic matter are absent. The elemental geochemical variation is Fe. 3+ and Fe 2+ The highest ratio indicates that the bright red sandstone 1 is the primary oxidation zone.

[0052] Based on the core samples, the rock is mainly light red medium-fine sandstone, with occasional red conglomerate and coarse sandstone. The rock is loose, and the mineral composition and alteration type assemblage show that the hematite content is lower than that of the bright red sandstone, and there is no black organic matter. The elemental geochemical variation is Fe. 3+ and Fe 2+ The ratio shows a decreasing trend, but the content of mineralized elements such as uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel is slightly higher than that of bright red sandstone 1. This indicates that the reducing ore-forming fluid from deep sources has weakly modified the primary oxidation formation, and light red sandstone 2 is identified as a weakly reducing zone.

[0053] Based on the core samples, which are mainly composed of grayish-red and yellowish-brown medium- to fine-grained sandstone, the mineral composition and alteration types show a low content of hematite, with small amounts of ferrodolithite, pyrite, and black organic matter closely related to mineralization. The elemental geochemical variation is Fe.3+ and Fe 2+ The ratio is lower than that of bright red sandstone 1 and light red sandstone 2. The content of mineralized elements such as uranium, rhenium, molybdenum, vanadium, copper, cobalt and nickel is significantly increased. It is determined that the reducing ore-forming fluid from deep source has moderately modified the primary oxidation formation. The degree of modification is stronger than that of the weak reduction zone. The gray-red sandstone 3 and gray-yellow sandstone are identified as the moderate reduction zone.

[0054] Based on its mineral composition and alteration type assemblage, it contains almost no hematite, but is rich in iron dolomite, barite, black organic matter, and pyrite, which are closely related to mineralization; the elemental geochemical variation is Fe. 3+ and Fe 2+ The ratio is the lowest, while the content of mineralized elements such as uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel is the highest. This indicates that the deep-source reducing ore-forming fluids have thoroughly reduced and transformed the primary oxidizing formations, and the gray sandstone 4 and grayish-white sandstone are identified as completely reduced zones.

[0055] Due to the influence of factors such as the intensity of the reducing ore-forming fluid from deep sources, system temperature, and pressure, the method provided in the embodiments of this application may lack weak reduction zones and / or moderate reduction zones in practical applications, retaining only the primary oxidation zone and the fully reduced zone.

[0056] Taking the L0-2 borehole of the Hailijin uranium deposit in the Songliao Basin as an example, the ore-bearing alteration zoning determined by the method provided in the embodiments of this application lacks a weak reduction zone.

[0057] Table 3. Ore-bearing alteration zones of borehole L0-2 in the Hailijin uranium deposit, Songliao Basin See Table 3, which shows the alteration zoning of the ore-bearing strata in borehole L0-2 of the Hailijin uranium deposit in the Songliao Basin. Table 3 lists, from left to right, the sampling depth, lithological characteristics and color, alteration zoning, elemental contents of uranium, molybdenum, rhenium, cobalt, copper, nickel, and vanadium, and Fe content of core samples from borehole L0-2 in the Hailijin uranium deposit in the Songliao Basin. 3+ and Fe 2+ The ratio, the elemental content of sulfur, and the elemental content of organic carbon.

[0058] The core samples from borehole L0-2 of the Hailijin uranium deposit in the Songliao Basin were taken at depths of 565.70m-604.0m. The lithological characteristics include conglomerate, medium sandstone, fine sandstone, argillaceous siltstone, and mudstone, and the colors include red, yellowish-green, gray, and grayish-white.

[0059] The sampling depth, elemental content of uranium, molybdenum, rhenium, cobalt, copper, nickel, and vanadium, as well as Fe... 3+ and Fe 2+The ratios, sulfur content, and organic carbon content correspond to each other, allowing a direct view of the lithological characteristics and different element contents of core samples taken at each depth. From top to bottom, the mineral composition, alteration type combination, and elemental geochemical changes of core samples taken at different depths can be directly determined, thereby identifying the alteration zoning of the ore-bearing strata in sandstone-type uranium deposits.

[0060] Table 3 is arranged from top to bottom according to the depth of the core samples, and the alteration zoning of the ore-bearing strata is determined according to the method provided in the embodiments of this application. According to Table 3, the alteration zoning of the sandstone-type uranium deposit in the L0-2 borehole of the Hailijin uranium deposit in the Songliao Basin can be seen intuitively: 565.70-567.70m is the primary oxidation zone, 567.90-597.40m is the completely reduced zone, 597.40-601.08m is the primary oxidation zone, 601.08-602.5m is the completely reduced zone; 602.1-602.5m is the primary oxidation zone, and 602.5-604.0m is the intermediate reduction zone.

[0061] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A method for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits, characterized in that, It includes the following steps: S10: Obtain core samples of the sandstone-type uranium deposit at different sampling depths; S20: Based on the core samples, determine the mineral composition and alteration type combination of the core samples at different sampling depths; S30: Determine the major elements, trace elements, and organic carbon of the core sample; based on the major elements, trace elements, and organic carbon of the core sample, determine the elemental geochemical changes of the core sample at different sampling depths. S40: Based on the mineral composition and alteration type combination determined in step S20 and the elemental geochemical changes determined in step S30, determine the alteration zoning of the ore-bearing layer.

2. The method according to claim 1, characterized in that, In step S20 Using a polarizing microscope, the mineral composition and alteration type combination of the core sample were determined based on the sample.

3. The method according to claim 2, characterized in that, S30 includes the following steps: S31: Determine the major elements of the core sample, and based on the major elements of the core sample, determine the Fe content of the core sample at different sampling depths. 3+ and Fe 2+ The trend of the ratio change; S32: Determine the trace elements of the core sample, and based on the trace elements of the core sample, determine the content variation trend of uranium, rhenium, molybdenum, vanadium, copper, cobalt and nickel elements of the core sample at different sampling depths; S33: Determine the organic carbon content of the core sample, and based on the organic carbon content of the core sample, determine the trend of organic carbon content variation at different sampling depths. S34: According to the Fe 3+ and Fe 2+ The changes in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the changes in the organic carbon content, are used to determine the elemental geochemical variations of the core samples at different sampling depths.

4. The method according to claim 3, characterized in that, In step S40 The alteration zoning of the ore-bearing strata includes primary oxidation zone, weak reduction zone, moderate reduction zone and complete reduction zone.

5. The method according to claim 4, characterized in that, Based on the mineral composition and alteration type, it contains a large amount of hematite and no black organic matter; the elemental geochemical change is Fe. 3+ and Fe 2+ The ratio is the highest, thus identifying the primary oxidation zone.

6. The method according to claim 5, characterized in that, Based on the mineral composition and alteration type combination, the content of hematite is lower than that of the primary oxidation zone, and it does not contain black organic matter; The elemental geochemical change is Fe 3+ and Fe 2+ The ratio shows a decreasing trend, and the contents of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are slightly higher than those of the primary oxidation zone, thus identifying the weak reduction zone.

7. The method according to claim 5, characterized in that, Based on the mineral composition and alteration type combination, the content of hematite is low, with a small amount of iron dolomite, pyrite and black organic matter. The elemental geochemical changes show an increasing trend in the content of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, thus identifying the intermediate reducing zone.

8. The method according to claim 5, characterized in that, Based on the mineral composition and alteration type combination, it is almost devoid of hematite, and rich in ferrodolite, barite, black organic matter and pyrite; The elemental geochemical change is Fe 3+ and Fe 2+ The ratio is the lowest, and the contents of the elements uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel are the highest, thus determining the complete reduction zone.

9. An apparatus for determining the alteration zoning of ore-bearing strata in sandstone-type uranium deposits, characterized in that, It includes: Sampling components, information acquisition components, elemental analysis components, and data processing components. The sampling device is configured to obtain core samples at different depths of the sandstone-type uranium deposit; The information acquisition device is configured to determine the mineral composition and alteration type combination of the core samples at different sampling depths based on the core samples. The elemental analysis device is configured to determine the major elements, trace elements, and organic carbon of the core sample, and to determine the elemental geochemical changes of the core sample at different sampling depths based on the major elements, trace elements, and organic carbon of the core sample. The data processing unit is configured to determine the alteration zoning of the ore-bearing strata of the sandstone-type uranium deposit based on the mineral composition, alteration type combination, and elemental geochemical changes of the core samples from different sampling depths.

10. The apparatus according to claim 9, characterized in that, The elemental analyzer is configured to determine the major elements of the core sample, and based on the major elements of the core sample, determine the Fe content of the core sample at different sampling depths. 3+ and Fe 2+ The trend of the ratio change; The trace elements of the core sample are determined, and based on the trace elements of the core sample, the content variation trends of uranium, rhenium, molybdenum, vanadium, copper, cobalt and nickel in the core sample at different sampling depths are determined. Determine the organic carbon content of the core sample, and based on the organic carbon content, determine the trend of organic carbon content variation in the core sample at different sampling depths; According to the Fe 3+ and Fe 2+ The changes in the ratios of uranium, rhenium, molybdenum, vanadium, copper, cobalt, and nickel, as well as the changes in the organic carbon content, are used to determine the elemental geochemical variations of the core samples at different sampling depths.

Images