Sandstone-type uranium deposit enrichment zone determination method and device, and storage medium

Abstract

The invention relates to a sandstone type uranium ore enrichment zone determination method and device, and a storage medium. The method comprises the steps of obtaining the content of thorium elements in energy spectrum logging; calculating the uranium element content according to the thorium element content; calculating a sedimentary environment factor; calculating a clay mineral relative content factor; calculating a shale content factor; calculating an organic matter content factor curve; ore control comprehensive evaluation parameters are calculated; and the uranium abnormal enrichment section is judged. According to the sandstone type uranium ore enrichment zone determination method and device and the storage medium provided by the embodiment of the invention, the ore body enrichment depth can be effectively calculated, so that the exploration cost is reduced, the exploration success rate is improved, and the method and device can be applied to new area exploration and have relatively high popularization and application values.

Description

Technical Field

[0001] The present application relates to the field of uranium enrichment zone determination, and in particular to a sandstone-type uranium enrichment zone determination method, device and storage medium. Background Art

[0002] In 1983, Shen et al. published "Distribution Characteristics of Uranium, Thorium and Potassium in Sedimentary Rocks" in the Journal of Sedimentary Sciences, which discussed that the distribution of uranium, thorium and potassium in sedimentary rocks shows a certain regularity in space. Usually, the uranium concentration increases in the center of the sedimentary basin, while the increase in thorium and potassium concentrations points to the trend of the nearshore source area. It also pointed out that the uranium, thorium and potassium content in mudstone is relatively high, and there is a high-value zone of uranium, thorium and potassium distribution in the sedimentary profile. In 2016, Guo Xusheng et al.'s patent "A method for predicting the content of clay minerals and their components in shale gas reservoirs" established a total clay mineral prediction model to predict the absolute content of the total clay minerals; the patent "A method for calculating the porosity of a variable clay skeleton" created a clay mineral skeleton model; the patent "A method for determining the clay mineral content of shale gas reservoirs" created a relationship between the thorium-uranium ratio curve and the clay mineral content to achieve quantitative evaluation of clay minerals; the patent "Method for identifying primary oxidized sedimentary structures" used trace elements to determine primary oxidized sedimentary structures;

[0003] The above methods discuss the application of radioactive logging in the evaluation of shale gas reservoirs or other reservoirs, including the calculation of clay mineral skeleton porosity, clay mineral content, and total clay mineral content, and also the application of thorium-uranium ratio to determine the environment. However, the above patents have the following limitations in the application of sandstone-type uranium prospecting methods:

[0004] ① At present, there are various methods for determining the direction of sandstone-type uranium deposits, including structural ore control method, interlayer oxidation zone ore control method, diabase ore control method, organic matter ore control method, etc. Each method has certain disadvantages and is not universally applicable. For example, the premise of determining the direction of the ore body by the interlayer oxidation zone is that there needs to be a large amount of logging data in the area to delineate the approximate range of the interlayer oxidation zone. Secondly, the interlayer oxidation zone method can only be used to determine mineralization in a certain area, and the ratio range needs to be redefined in other areas. The diabase ore control method requires a lot of seismic interpretation. The shallow seismic data is limited by quality and cannot clearly identify diabase, and there is no direct evidence to prove that diabase has a direct control effect on mineralization. They are all rough guesses. The porosity and permeability ore control method also has certain disadvantages, that is, the places where uranium is enriched have undergone sudden changes in porosity and permeability, but the places with large coefficients of variation of porosity and permeability are not necessarily mineralized. The organic quality control method is actually a relatively reliable prediction method. However, due to the rapid changes in the river channel in the braided river delta phase, the distribution regularity of organic matter is not obvious. ② In the literature search, various reservoir prediction methods for clay minerals were retrieved. It is believed that clay minerals can be predicted by multiple methods. However, the above patent only mentioned the quantitative relationship of clay minerals, without detailed explanation of the relationship with mineralization, and the use of clay minerals to predict the direction of ore bodies, and there is no method of using thorium and potassium to determine the direction of uranium ore bodies. ③ Some scholars have also proposed that the spatial distribution of uranium, thorium, and potassium shows a certain regularity and has a certain relationship with the distribution of uranium ore, and the direction of the source can be determined. However, this only indicates the correlation and cannot specifically guide the direction of prospecting. The range given is too wide and the implementation is difficult. Summary of the invention

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a method, device and storage medium for determining a sandstone-type uranium enrichment zone.

[0006] In a first aspect, the present application provides a method for determining a sandstone-type uranium ore enrichment zone, the method comprising the steps of:

[0007] Obtain the thorium content in spectrum logging;

[0008] Calculating the uranium content based on the thorium content;

[0009] Calculate sedimentary environmental factors;

[0010] Calculate the relative content factor of clay minerals;

[0011] Calculate the mud content factor;

[0012] Calculate the organic matter content factor curve;

[0013] Calculate comprehensive evaluation parameters of ore control;

[0014] Determine the abnormal uranium enrichment section.

[0015] Preferably, the expression of the uranium content is:

[0016] Q Uy =AQ Th +B;

[0017] Among them, Q Uy represents the uranium content value measured based on the thorium content, A represents the sedimentation environment factor, Q Th represents the thorium content value measured by spectrum logging, and B represents the correlation coefficient.

[0018] Preferably, the calculation of the deposition environment factor comprises the steps of:

[0019] Get the content value of thorium element;

[0020] Get the content value of uranium element;

[0021] Calculating the ratio of the content value of the thorium element to the content value of the uranium element;

[0022] The ratio is used as the deposition environment factor.

[0023] Preferably, the expression of the deposition environment factor is:

[0024]

[0025] Among them, A represents the sedimentary environment factor, TH represents the content of thorium, and U represents the content of uranium.

[0026] Preferably, the calculation of the clay mineral relative content factor comprises the steps of:

[0027] The clay mineral content is calculated by the thorium content;

[0028] The clay mineral content is calculated by the potassium content;

[0029] Sedimentary facies division is carried out through clay mineral identification and classification.

[0030] Preferably, the expression of the mud content factor is:

[0031]

[0032] Among them, C represents the shale content factor, GCUR is the rock coefficient, and SHCGR represents the uranium-free gamma shale content of the formation.

[0033] Preferably, the expression of the comprehensive evaluation parameter of ore control is:

[0034] G = (D + 42 * B + 83 * C) / A * 7;

[0035] Among them, G represents the comprehensive evaluation parameter of ore control, A represents the sedimentary environment factor, B represents the relative content factor of clay minerals, C represents the mud content factor, and D represents the organic matter content factor curve.

[0036] Preferably, the step of determining the abnormal uranium enrichment section comprises the following steps:

[0037] Determine whether the thorium content value in the current area is greater than a preset value;

[0038] If so, the current area is judged to be an abnormally uranium-enriched section.

[0039] In a second aspect, a device for determining a sandstone-type uranium ore enrichment zone is provided, comprising:

[0040] Thorium content acquisition module, used to obtain the thorium content in energy spectrum logging;

[0041] A uranium content calculation module, used for calculating the uranium content according to the thorium content;

[0042] A sedimentation environment factor calculation module is used to calculate sedimentation environment factors;

[0043] Clay mineral relative content factor calculation module, used to calculate clay mineral relative content factor;

[0044] The mud content factor calculation module is used to calculate the mud content factor;

[0045] Organic matter content factor curve calculation module, used to calculate the organic matter content factor curve;

[0046] The mining control comprehensive evaluation parameter calculation module is used to calculate the mining control comprehensive evaluation parameters;

[0047] The uranium abnormal enrichment section judgment module is used to judge the uranium abnormal enrichment section.

[0048] According to a third aspect, an electronic device is provided, the electronic device comprising:

[0049] at least one processor; and,

[0050] a memory communicatively connected to the at least one processor; wherein,

[0051] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute any of the aforementioned methods for determining the enriched zone of sandstone-type uranium deposits.

[0052] In a fourth aspect, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute any of the aforementioned methods for determining a sandstone-type uranium enrichment zone.

[0053] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0054] The sandstone-type uranium ore enrichment zone determination method, device and storage medium provided in the embodiments of the present application can effectively calculate the enrichment depth of the ore body, thereby reducing exploration costs and improving exploration success rate, and can be applied to new area exploration, and has a high value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0057] Figure 1 It is a schematic flow chart of a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0058] Figure 2 It is a structural schematic diagram of a device for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0059] Figure 3 It is a structural schematic diagram of an electronic device provided by the present invention;

[0060] Figure 4 It is a structural schematic diagram of a non-transitory computer-readable storage medium provided by the present invention;

[0061] Figure 5 It is a schematic diagram of a well spectrum logging chart in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0062] Figure 6 It is a schematic diagram of a Schlumberger plate in a method for determining a sandstone-type uranium enrichment zone provided by an embodiment of the present invention;

[0063] Figure 7 It is a schematic diagram of the relationship between sedimentary environment and mineralization in a method for determining a sandstone-type uranium enrichment zone provided by an embodiment of the present invention;

[0064] Figure 8 It is a comprehensive interpretation diagram of well spectral logging in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0065] Fig. 9 It is a schematic diagram of a Schlumberger plate in a method for determining a sandstone-type uranium enrichment zone provided by an embodiment of the present invention;

[0066] Fig.10 It is a schematic diagram of an interpretation chart of the relationship between organic matter factors and ore body distribution in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0067] Fig.11 It is a schematic diagram of an organic matter factor formula in a method for determining a sandstone-type uranium ore enrichment zone provided in an embodiment of the present invention;

[0068] Fig.12 It is a schematic diagram of a comprehensive interpretation diagram of the relationship between mud content and ore body in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0069] Fig.13 It is a schematic diagram of ore body distribution in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0070] Fig.14 It is a schematic diagram of clay mineral factors in a method for determining a sandstone-type uranium enrichment zone provided by an embodiment of the present invention;

[0071] Fig.15 It is a schematic diagram of the interpretation and evaluation results of a well in a new block in a study area in a method for determining a sandstone-type uranium enrichment zone provided by an embodiment of the present invention;

[0072] Fig.16 It is a schematic diagram of the distribution of the relationship between the organic matter factor D and the ore body in a method for determining a sandstone-type uranium ore enrichment zone provided by an embodiment of the present invention;

[0073] Fig.17 It is a schematic diagram of the distribution diagram of the relationship between the comprehensive evaluation factor G and the ore body in a method for determining a sandstone-type uranium enrichment zone provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0075] Figure 1A schematic flow chart of a method for determining a sandstone-type uranium enrichment zone provided in an embodiment of the present application.

[0076] The contents of uranium, thorium and potassium in the sediments of the crustal sedimentary sphere are shown in Table 1. Taking the Qianjiadian area as an example, in the sandstone-type uranium ore enrichment area, the wells that have been drilled, and the well logging interpretation and energy spectrum logging have been completed show that the energy spectrum logging shows that the uranium content value varies greatly, up to several thousand PPm. The uranium content of the red sandstone of the primary lake-alluvial phase is about 2.2, while the background value in the Qianjiadian area has reached 6.2; the thorium content also varies greatly, and the maximum can reach several hundred PPm. In the ore body enrichment area, there is also a large range of potassium changes in some sections. In geochemical research, it is generally believed that thorium is directly related to uranium enrichment, while potassium is not related to uranium enrichment. In the Qianjiadian area, the thorium value must have a large abnormal value in the area with abnormal uranium mineralization, and most of the potassium values ​​are also abnormal. This phenomenon is also common in sandstone-type uranium deposits in other regions. Therefore, thorium and potassium anomalies can be used as an indicator to determine sandstone-type uranium anomalies.

[0077] Table 1 The contents of uranium, thorium and potassium in the sedimentary sphere of the Upper Cretaceous strata in the Songliao Basin are as follows:

[0078] Lithology Uranium (ppm) Thorium(ppm) Potassium (%) Thorium to Uranium Ratio sandstone 5-7 2-8 1.45-2.11 2-3 Argillaceous siltstone 6-10 3-10 1.45-2.61 2.5-3.5 Mudstone 7-12 3-11 1.5-2.78 3-4

[0079] The present application provides a method for determining a sandstone-type uranium ore enrichment zone, the method comprising the steps of:

[0080] S1: Obtain the thorium content in the energy spectrum logging;

[0081] S2: Calculating the uranium content according to the thorium content;

[0082] Specifically, uranium is relatively active in chemical properties and is a typical oxygen-loving element. The compounds formed by thorium are stable in nature and are mainly mechanically migrated. They are generally not affected by other factors. Salts formed by potassium in different environments are easier to migrate. Thorium can truly reflect the element distribution characteristics of the original state of the stratum. For sandstone-type uranium deposits, potassium is ineffective, while radon and its daughters produced by the decay of uranium or thorium elements in the deep can migrate upward through the channels provided by the fault structure. Therefore, uranium or thorium can be used as indicator elements. In many areas, thorium normalization method is usually used to eliminate interference information. Application formula: QUy=AQTh+B, QU d =QU-QUy

[0083] QUy---Uranium content value measured according to thorium content;

[0084] Therefore, there is a linear relationship between thorium and uranium, and the uranium content value can be directly determined according to the thorium content, but the coefficients are different in each region. The actual thorium element cannot fully reflect the enrichment degree of uranium ore bodies. It is just a simple, direct and fast method. In the evaluation of a new area, since there are few drill wells and uranium is unstable, the background value can be roughly determined through the thorium value. If there is a thorium anomaly and the anomaly value is relatively high, the uranium mineralization conditions can be initially determined. When the local Th value is greater than 50PPm, the possibility of forming an industrial ore is relatively high. If it is three times higher than the base value, it can be determined that there may be mineralization. If there is no thorium anomaly, basically no ore is formed. The following method in Step 3 is applied to mature blocks.

[0085] S3: Calculate the sedimentary environment factor;

[0086] Specifically, the environment is determined by applying the TH / U and TH / K ratios. The enrichment of uranium is controlled by the sedimentary environment and sedimentary facies. When the sedimentary environment transitions to the nearshore shallow water sedimentary facies, it is the key factor controlling uranium enrichment. During the nearshore shallow water sedimentary period, an alternating sedimentary environment of above-water and underwater is generated, causing the early sedimentary strata to be weathered and leached, and a series of chemical weathering sedimentary products are produced, including a large amount of clay minerals (ferric clay minerals, illite minerals, kaolinite minerals, chlorite, etc.). These clay minerals have accumulated a large amount of uranium, thorium, and potassium ions in various ways to form uranium, thorium, and potassium enrichment and mineralization. This method mainly applies the TH / U ratio and combines with the crossplot method to determine the sedimentary environment of the ore body. As shown in (Appendix Figure 7 ), this method sets the TH / U ratio as the sedimentary environment factor A. When A < 2, it is a reducing environment; when 2 < A < 7, it is a transitional environment; when A > 7, it is an oxidizing environment or a weathered facies and contains bauxite. When the environmental factor A > 7 transitions to an environment where 2 < A < 7 alternates frequently, and then transitions to a stable environment with A < 2 and a thickness greater than 10 meters, it is an enrichment zone. The order on the cross-section is from old to new, and on the plane, as long as there is this transition, it is an enrichment zone. There is a linear relationship between TH / K and organic matter. The module is used to simulate the regional formula to determine the role of the organic matter factor in mineralization.

[0087] S4: Calculate the relative content factor of clay minerals;

[0088] Specifically, clay minerals have unsaturated charges and a large specific surface area, which determine that clay minerals have characteristics such as adsorption, ion exchange, swelling, dispersion, cohesion, and plasticity. They have physical and chemical adsorption properties and will adsorb a large amount of radioactive substances during the sedimentation process, resulting in an increase in radioactive content due to the increase in mud content in the strata. Different clay minerals have different adsorption abilities for uranium, thorium, and potassium. The contents of uranium, thorium, and potassium in the gamma ray spectrometry logging are different. Therefore, calculating the clay content of these minerals can correspondingly reflect the amount of uranium adsorbed. However, the clay mineral content is related to both thorium and potassium in the gamma ray spectrometry. The method and principle for calculating the relative content factor of clay minerals are as follows:

[0089] (1) Calculate the clay mineral content by Th content:

[0090] Since the TH content reflects the relative value of the degree of chemical alteration, the K element reflects the relative value of the migration degree of feldspar, and U represents the relative content of U in the area, the soluble substances generated by potassium feldspar during weathering and hydrolysis, such as potassium carbonate, potassium hydroxide, and colloidal silica, are lost with water, leaving only kaolinite, muscovite, and part of silica, which form clay minerals after a long geological period. Therefore, thorium can reflect the relative content of clay minerals in a region. Although the TH anomaly is large, the base value does not change much. In areas where the degree of weathering and dissolution is not high, the TH value is relatively stable, and the potassium base value is relatively stable, so it is easy to obtain the base value. The relative content of TH clay minerals is calculated by referring to the method of calculating mud content using uranium-free gamma:

[0091] B1=VTHi=(THi-TH 基值 ) / (THmax-TH 基值 ),(i=1,2...a certain depth point)

[0092] (2) Calculate the clay mineral content by K content:

[0093] K minerals produced by the hydrolysis of potassium feldspar are easy to migrate, and the potassium content usually increases as the fluidity of the rock becomes finer. Most of the sandstone-type uranium-enriched areas develop positive and negative K anomalies. The plate verifies that the clay minerals in this area are mainly chlorite and illite. The positive anomaly area is mainly affected by the increase of clay mineral illite (the positive anomaly area indicates the increase of clay mineral illite), which represents the enrichment of clay minerals; the negative anomaly area of ​​K element represents that the parent rock of the formation in this area is strongly leached, and potassium loss is large. Leaching also produces a large amount of clay minerals while losing potassium, thereby adsorbing uranium. Therefore, both positive and negative potassium anomalies play a positive role in mineralization. In the sandstone-type uranium mineralization area, all are deposited in nearshore shallow water environments, the water body is relatively stable, and the element migration distance is relatively close, so there will be both positive and negative potassium anomalies. Both positive and negative anomalies of clay mineral content are caused by clay minerals that have an agglomeration effect on mineralization. Therefore, the area uses the method of superimposing the absolute value of K anomaly in two cases to calculate the relative content of clay minerals: B2 = VKi = (|Ki-K 基值 |) / K 基值 , (i=1,2......)

[0094] (3) Sedimentary phase division through clay mineral identification and classification.

[0095] Different types of clay minerals play different roles in uranium mineralization. Kaolinite has large particles, is easy to migrate, and blocks the throat, which plays a positive role in the enrichment of U and Th molecules, making it difficult for U and Th molecules to migrate away. Illite has a certain expansion and dispersion, is water-sensitive and speed-sensitive, and has the effect of shrinking the throat, similar to the effect of kaolinite. Chlorite is acid-sensitive and oxidizes the environment to produce Fe(OH)3 gel. This gel can also block pores and throats, causing U and Th to be squeezed out. Therefore, it is difficult to enrich Th and U in iron-enriched reservoirs, so the red layer does not form minerals. The illite-montmorillonite mixed layer has high hydrophilicity, expansion and very high specific surface area, and has an adsorption effect on U and Th. Therefore, the clay minerals that can be identified in the plate can all play an adsorption and aggregation role in mineralization. However, different types of clay minerals have different effects on mineralization. Since most of the clay minerals in sandstone are favorable factors for uranium mineralization, but the magnitude of their effects is different, the parameter B3 of various clay minerals is B3=1 for kaolinite, B3=2 for illite, B3=4 for mixed layers of illite and montmorillonite, B3=0.5 for other clays, and B3=0 if iron clay appears.

[0096] Application of Schlumberger TH-K interpretation chart (attached Figure 6 ), combined with the relationship between TH / K ratio and clay mineral type (Table 2), combined with core and cuttings data to identify and classify clay minerals: determine the type of clay minerals and distinguish sedimentary phases. TH / K is used to determine the hydrodynamic conditions, mud content, clay mineral content, organic matter content, etc. during sedimentation. A high TH / K ratio means that the organic matter content in the area is high. The higher the TH / K ratio, the higher the clay mineral content in the area. The wide range of TH / K ratios indicates that the hydrodynamic conditions in the area vary greatly. Stable TH / K ratios indicate that the hydrodynamic conditions in the area are stable.

[0097] Table 2 Relationship between TH / K ratio and clay mineral type

[0098] TH / K >12 31.5-12 2-31.5 1-2 Clay mineral types Kaolin type Ion-Montene mixed layer Illite Mica clay

[0099] For example, a well in the Qianjiadian area shows that the clay type is mainly illite, followed by mica and chlorite, and a small amount of layered mixture. The U, TH, and K contents are relatively high, indicating that the mud content is high and the organic matter abundance is high. The TH / K ratio varies widely, indicating that the mud content is sometimes more and sometimes less, the hydrodynamic conditions are sometimes strong and sometimes weak, and the sedimentary environment frequently transitions between the low-energy reducing environment and the high-energy oxidizing environment. The TH / U ratio is mostly less than 2, indicating that the sedimentary environment is mainly low-energy reducing environment. Based on the above analysis, this section of the stratum is characterized by delta front phase deposition.

[0100] The TH anomaly in this area can mainly reflect the relative amount of clay minerals produced by weathering, alteration, and chemical deposition, while the potassium anomaly directly reflects the adsorption capacity of clay minerals. Therefore, the uranium accumulation capacity of this area is determined by superposition of two variables. Multiple variables are simply superimposed as the total relative clay mineral content: B = Vclayi = B3*(B1+B2), (i = 1, 2........), and the Vclayi data is loaded into a new column of the logging curve, representing the relative content of clay minerals.

[0101] S5: Calculate the mud content factor;

[0102] Specifically, the mud content is composed of clay minerals and impurities, including siltstone and limestone. In the sandstone-type uranium-rich area, siltstone, argillaceous siltstone and silty mudstone layers all have an adsorption effect on uranium and belong to uranium-enriched reservoirs. Therefore, as a mineralization influencing factor, the mud content needs to be considered for its mineralization effect. The shale content can be calculated by using spectral logging. In the sandstone-type uranium-rich area, due to the large-scale uranium anomaly in the area, many GR values ​​cannot represent the mud content. Therefore, the uranium-free gamma logging curve is used in this area to calculate the mud content, which is closer to the true value of the mud content.

[0103] Application formula: SHCGR = (CGR-CGRmin) / (CGRmax-CGRmin);

[0104] C = VSHCGR = (2GCUR * SHCGR-1) / (2GCUR-1), add the calculated mud content factor C to the logging curve column.

[0105] SHCGR is the relative value of the logging curve for calculating the shale content; VSHCGR is the uranium-free gamma shale content of the formation; CGR is the measured uranium-free gamma value API; CGR is the uranium-free gamma value of the pure formation, API; CGRmin is the uranium-free gamma value API of the pure mudstone formation; GCUR is the rock coefficient; the old formation is taken as 2.

[0106] S6: Calculate the organic matter content factor curve;

[0107] Specifically, the organic matter content has a direct relationship with the TH / K value. Due to the presence of a large number of Th anomalies and K anomalies in this area, it is impossible to calculate according to a linear relationship. By fitting the test samples and batch data points measured in this study area, the empirical formula for the area is obtained, and the data is added to the well logging curve column as the organic matter relative content factor D. Combined with the clay mineral type and the richness of the organic matter content, the enrichment depth range can be preliminarily determined.

[0108] S7: Calculate comprehensive evaluation parameters of ore control;

[0109] Specifically, from the analysis of the above-mentioned ore-controlling factors, it can be seen that the distribution of ore bodies is mainly controlled by the four ore-controlling factors A, B, C, and D, and none of the conditions can be missing. Through multiple fittings, the empirical formula G = (D + 42 * B + 83 * C) / A * 7 can accurately determine the degree of uranium enrichment with an accuracy of more than 90%. This method is also applicable to the exploration of new areas with only one well. The energy spectrum logging curve can basically determine the enrichment of U. Even if there is no uranium anomaly in the area, the calculated variables can basically determine the degree of weathering and leaching in the area and the probability of chemical deposition. If these values ​​are higher than other areas in the basin, it can be judged that the area has mineralization potential, guide well deployment, and predict the direction of ore bodies in new area exploration.

[0110] S8: Determine the abnormal uranium enrichment section.

[0111] Specifically, the method of determining the abnormal uranium enrichment section comprises the following steps:

[0112] Determine whether the thorium content value in the current area is greater than a preset value;

[0113] If so, the current area is judged to be an abnormally uranium-enriched section.

[0114] In the embodiment of the present application, when the thorium content value is greater than 50 ppm or three times the regional background value, it can be determined that the current area is an enriched area of ​​sandstone-type uranium deposits.

[0115] Example

[0116] Embodiment 1: The present invention has been tested in the Zhangqiang area and Ludong area, which have been deployed. In these two areas, the method of interlayer oxidation zone is used to predict the conditions for mineralization. In recent years, many exploration wells have been deployed, but the effect is not ideal. The method of adding exploration wells to explore the interlayer oxidation zone is not ideal. The method is used for comprehensive analysis. Step 1: Preliminary determination of whether Th and K values ​​are abnormal in energy spectrum logging. After checking multiple exploration wells, no Th and K anomalies were found. The other mineralization conditions in these two areas are similar to those in Qianjiadian area, and the mineralization anomaly is not ideal. The main reason is that the degree of weathering and leaching in this area is low, the content of clay minerals is low, and enough uranium cannot be gathered. Therefore, the degree of mineralization is low. Especially in the Zhangqiang area, the TH anomaly value is far lower than the background value in the Qianjiadian area, and step 2: Th>50PPm value is even less. It has hardly experienced weathering and leaching, the content of clay minerals is extremely low, and it basically does not have mineralization conditions. Therefore, this method is also very ideal for the exploration effect of new areas.

[0117] Embodiment 2: Before applying the present invention to a block in the study area, the present invention uses the interlayer oxidation zone identification method. Because there are not many existing wells, it is difficult to determine the range of the transition zone. Therefore, the method is used to analyze the wells that have been drilled in the area, as shown in (Attached Fig.15) From the perspective of the redox environment, the block has frequent oxidation-reduction repetitions, and only two relatively stable reduction environments. According to step one: Th anomaly is higher than the background value. Step two, there is no Th anomaly value higher than 50PPm, but there are ones close to 50PPm. Step three: Environmental factor A<7 accounts for most of the cases, which meets the judgment conditions. Step four: Clay mineral factors are generally greater than 0.3, indicating that the weathering and leaching process in this area is insufficient in clay minerals, and the weathering and leaching of the entire well section is insufficient. Step five: There are high abnormal areas in the calculation of mud content, indicating that if mineralization is possible, it may be a mineralized layer related to mud sandstone or silty mudstone. Step six: In the determination of organic matter factors, only one layer D>10, so it is determined that the mud content in sandstone plays an important role in mineralization. The clay mineral factor is slightly higher and the organic matter is rich. It mainly depends on the sedimentary environment. If there is a layer section with a long period of reduction environment in this block, it can be mineralized. According to the distribution of mud content layers, 17 wells were deployed in the area, and industrial wells were seen, achieving good results.

[0118] Example 3: The dark mudstone content in a certain block in the study area is relatively low, and it is also difficult to identify the interlayer oxidation zone. During the deployment process, the boundaries of the interlayer oxidation zone are constantly adjusted. This method is applied to redetermine the direction of the ore body in the area, and the deployment of predicted survey wells has also achieved good results. The industrial ore-seeing rate of exploration wells deployed on this basis has reached more than 60%. It basically serves the purpose of improving the accuracy of exploration, and judging from the wells that have been drilled so far, this law is generally applicable. Since this block belongs to a mature block, it is mainly used to determine the direction of the ore body and deploy well locations. Steps one and two can be directly omitted, and a step of establishing a data work area is added. The specific steps are as follows:

[0119] Step 1: Establish a database for the study area, load well logging curves, and perform geological stratification for the area. Load 2,000 wells’ spectral logging data, lithology data, thin sections, and other data. The data is complete and can meet the research needs. The application of GPT software can realize fast curve calculation, data statistics, and basic mapping.

[0120] Step 2: Determine the sedimentary environment and sedimentary phase: as shown in (Attachment Figure 8) This well, the core color is used to determine that the gray sandstone in the upper part of the well is the transition zone, and the red sandstone in the lower part is the oxidation zone. The actual application of the TH / U ratio is determined by the environmental factor A. The curve range is 2-7. The mineralization position of this well is in a range of A<2, which is a relatively long-term reduction environment in the redox alternating environment. In the lower part, due to the frequent alternation of the redox environment, there is not enough time for chemical deposition, so it is not conducive to mineralization. The actual mineralization zone occurs in a long-term reduction environment in the redox transition zone. At the same time, the TH / K value of the well was used to identify the sedimentary environment. The U, TH, and K contents were all relatively high, indicating a high mud content and high organic matter abundance. The TH / K ratio varied widely, indicating that the mud content was sometimes more and sometimes less, the hydrodynamic conditions were sometimes strong and sometimes weak, and the sedimentary environment frequently transitioned between a low-energy reducing environment and a high-energy oxidizing environment. The TH / U ratio was mostly less than 2, indicating that the sedimentary environment was mainly a low-energy reducing environment. Based on the above analysis, this section of the stratum has the characteristics of delta front phase deposition, and the mineralization environment is favorable for mineralization.

[0121] Step 3: Calculate the clay mineral content through TH and K content.

[0122] Determine the clay mineral type of the well: Apply Schlumberger interpretation chart (attached Fig. 9 ), combined with core and rock debris data, it is determined that the clay type is mainly illite, followed by mica and chlorite, and a small amount of layered mixture. Combined with the core optical data of this area, there is a special type of clay mineral in this area, iron clay mineral, which is related to volcanic debris or volcanic activity. It cannot be identified in this plate. The layers with high content of iron clay minerals and volcanic debris do not have mineralization conditions. B3 has different values ​​in different wells. When it is kaolinite, B3=1, when it is illite, B3=2, when it is illite-montmorillonite mixed layer, B3=4, and other clays B3=0.5. If iron clay appears, B3=0.

[0123] B1=VTHi=(THi-THmin) / (THmax-THmin), (i=1,2...a certain depth point)

[0124] B2=VKi=(|Ki-K 基值 |) / K 基值 ,(i=1,2........)

[0125] B=Vclayi=B3*(VTHi+VKi)=B3*(B1+B2),(i=1,2.....)

[0126] According to the above three formulas, a comprehensive clay mineral content can be obtained. The favorable mineralization section determined by clay content in this area is completely consistent with the oil field logging interpretation results. Fig.14And the maximum value of clay mineral content is used to form a plane map, which is in good agreement with the distribution of the explored ore bodies.

[0127] Step 4: Calculate the shale content factor C using the uranium-free gamma log curve: Fig.12 As shown: In sandstone formations, the mud content is directly related to the distribution of ore bodies. However, many mudstone formations have very high uranium-free gamma mud content, which is mainly affected by mudstone. Therefore, the mud content alone cannot be used to determine the direction and distribution of ore bodies. However, the mudstone content in a certain study area in this region is very small, basically non-existent. In the past, the prediction of ore bodies used the distribution of dark mudstone to predict the direction of ore bodies, which was difficult to predict. Therefore,

[0128] Application formula: SHCGR = (CGR-CGRmin) / (CGRmax-CGRmin)

[0129] C = VSHCGR = (2GCUR * SHCGR-1) / (2GCUR-1), where GCUR is 2, and the calculated results are listed in a separate column C as the shale content factor curve. Using this method, the shale content calculation results of strata without shale are very well matched with the logging interpretation results (such as the attached Fig.13 ). A plan distribution map was formed to predict the direction of the ore body. Five wells were deployed in the block, and industrial ore layers were found in all of them.

[0130] Step 5: Apply the linear relationship between organic matter content and TH / K. By measuring the TH / K value of Qianjiadian area and the measured test samples and fitting the batch data points (see Appendix Fig.11 ), so the empirical formula for the area is D = 2.031 (TH / K) 1.661, and the data is added to the well logging curve column as the organic mineral control factor D. Combined with the clay mineral type and the richness of organic matter content, the enrichment depth range (such as the adjacent Fig.10 ). Find the maximum value of D for all wells and use the maximum value to form a plan view of organic matter distribution (such as Fig.16 ), predict favorable areas.

[0131] Step 6: Combine the ore-controlling characteristics and ore-controlling capabilities of each ore-controlling factor to calculate the overall comprehensive evaluation parameter G. From the analysis of the above ore-controlling factors, it can be seen that the distribution of ore bodies is mainly controlled by the four ore-controlling factors A, B, C, and D, and none of them can be missing. The overall evaluation standard of the area is obtained through comprehensive analysis, G = (D + 42 * B + 83 * C) / A * 7. Based on this empirical formula, the uranium enrichment location (such as the attached Fig.17), after verification of more than 1,000 wells, it is believed that this method is 100% effective and can very intuitively derive the main mineralization factors of the area's mineralization and non-mineralization. And the distribution characteristics of each zone and each layer A, B, C, D on the plane are used to predict the direction of the ore body. For example, the *** well deployed this year accurately predicted the mineralization section and mineralization location. Applying GPT software, the organic matter factor D, mud content factor C, and clay mineral factor B are obtained from all wells in a certain block in the study area. It can be seen that clay mineral factor B <0.3, mud content factor C <0.4, organic matter factor D>10, sedimentary environment factor A <7, and comprehensive evaluation factor G>400 are favorable areas.

[0132] like Figure 2 , provides a device for determining a sandstone-type uranium ore enrichment zone, comprising:

[0133] The thorium element content acquisition module 10 is used to obtain the thorium element content in the energy spectrum logging;

[0134] A uranium content calculation module 20, used to calculate the uranium content according to the thorium content;

[0135] A deposition environment factor calculation module 30, used to calculate deposition environment factors;

[0136] A clay mineral relative content factor calculation module 40 is used to calculate the clay mineral relative content factor;

[0137] A mud content factor calculation module 50 is used to calculate the mud content factor;

[0138] An organic matter content factor curve calculation module 60 is used to calculate an organic matter content factor curve;

[0139] A mining control comprehensive evaluation parameter calculation module 70, used to calculate mining control comprehensive evaluation parameters;

[0140] The uranium abnormal enrichment section judging module 80 is used to judge the uranium abnormal enrichment section.

[0141] The device for determining a sandstone-type uranium ore enrichment zone provided in the present application can execute a method for determining a sandstone-type uranium ore enrichment zone provided in the above steps.

[0142] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0143] Reference below Figure 3 , which shows a schematic diagram of the structure of an electronic device 100 suitable for implementing the embodiment of the present disclosure. The electronic device in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle terminals (such as vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 3 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0144] like Figure 3 As shown, the electronic device 100 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 101, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 102 or a program loaded from a storage device 108 to a random access memory (RAM) 103. In the RAM 103, various programs and data required for the operation of the electronic device 100 are also stored. The processing device 101, the ROM 102, and the RAM 103 are connected to each other via a bus 104. An input / output (I / O) interface 105 is also connected to the bus 104.

[0145] Typically, the following devices may be connected to the I / O interface 105: an input device 106 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 107 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 108 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 109. The communication device 109 may allow the electronic device 100 to communicate with other devices wirelessly or by wire to exchange data. Although the electronic device 100 having various devices is shown in the figure, it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

[0146] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 109, or installed from the storage device 108, or installed from the ROM 102. When the computer program is executed by the processing device 101, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0147] Reference below Figure 4, which shows a structural schematic diagram of a computer-readable storage medium suitable for implementing an embodiment of the present disclosure, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it can implement a method for determining a sandstone-type uranium enrichment zone as described in any of the above.

[0148] The sandstone-type uranium ore enrichment zone determination method, device and storage medium provided in the embodiments of the present application can effectively calculate the enrichment depth of the ore body, thereby reducing exploration costs and improving exploration success rate, and can be applied to new area exploration, and has a high value for promotion and application.

[0149] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0150] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for determining a sandstone-type uranium ore enrichment zone, characterized in that: The method comprises the steps of: Obtain the thorium content in energy spectrum logging; Calculating the uranium content based on the thorium content; Calculate sedimentary environmental factors; Calculate the relative content factor of clay minerals; Calculate the mud content factor; Calculate the organic matter content factor curve; Calculate comprehensive evaluation parameters of ore control; Determine the abnormal uranium enrichment section.

2. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The expression of the uranium content is: Q Uy =AQ Th +B; Among them, Q Uy represents the uranium content value measured based on the thorium content, A represents the sedimentation environment factor, Q Th represents..., B represents the relative content factor of clay minerals.

3. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The calculation of the deposition environment factor comprises the steps of: Get the content value of thorium element; Get the content value of uranium element; Calculating the ratio of the content value of the thorium element to the content value of the uranium element; Using the ratio as the deposition environment factor; Wherein, the expression of the deposition environment factor is: Among them, A represents the sedimentary environment factor, TH represents the content of thorium, and U represents the content of uranium.

4. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The calculation of the clay mineral relative content factor comprises the steps of: The clay mineral content is calculated by the thorium content; The clay mineral content is calculated by the potassium content; Sedimentary facies division is carried out through clay mineral identification and classification.

5. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The expression of the mud content factor is: Among them, C represents the shale content factor, GCUR is the rock coefficient, and SHCGR represents the uranium-free gamma shale content of the formation.

6. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The expression of the comprehensive evaluation parameter of ore control is: G = (D + 42 * B + 83 * C) / A * 7; Among them, G represents the comprehensive evaluation parameter of ore control, A represents the sedimentary environment factor, B represents the relative content factor of clay minerals, C represents the mud content factor, and D represents the organic matter content factor curve.

7. The method for determining the enriched zone of sandstone-type uranium ore according to claim 1, characterized in that: The method for determining the abnormal uranium enrichment section comprises the following steps: Determine whether the thorium content value in the current area is greater than a preset value; If so, the current area is judged to be an abnormally uranium-enriched section.

8. A device for determining a sandstone-type uranium ore enrichment zone, characterized in that: include: Thorium content acquisition module, used to obtain the thorium content in energy spectrum logging; A uranium content calculation module, used for calculating the uranium content according to the thorium content; A sedimentation environment factor calculation module is used to calculate sedimentation environment factors; Clay mineral relative content factor calculation module, used to calculate clay mineral relative content factor; The mud content factor calculation module is used to calculate the mud content factor; Organic matter content factor curve calculation module, used to calculate the organic matter content factor curve; The mining control comprehensive evaluation parameter calculation module is used to calculate the mining control comprehensive evaluation parameters; The uranium abnormal enrichment section judgment module is used to judge the uranium abnormal enrichment section.

9. An electronic device, characterized in that: The electronic device comprises: At least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the enriched zone of sandstone-type uranium deposits as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the method for determining the enriched zone of sandstone-type uranium deposits according to any one of claims 1 to 7.

Images