CN114384604A - Method for optimizing sandstone-type uranium ore favorable uranium-bearing area based on uranium ore forming elements - Google Patents
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 193
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000002349 favourable effect Effects 0.000 title claims abstract description 15
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 4
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 15
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 9
- 229910052776 Thorium Inorganic materials 0.000 claims description 9
- 238000005485 electric heating Methods 0.000 claims description 9
- 229910017604 nitric acid Inorganic materials 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 230000029087 digestion Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000010025 steaming Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
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- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 239000012498 ultrapure water Substances 0.000 claims description 3
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- 238000010813 internal standard method Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims 3
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Abstract
The invention belongs to the technical field of uranium ore geological exploration, and particularly relates to a method for optimizing a sandstone-type uranium ore favorable uranium-bearing area based on uranium ore-forming elements. The invention comprises the following steps: step 1, determining uranium source conditions: solving the average original uranium content of the etched source region for recovery; step 2, determining uranium reservoir conditions; in step S3, uranium reservoir reduction conditions are determined; and 4, calculating a uranium mineralization probability coefficient P and optimizing a uranium-bearing area. The method can simply, accurately and quickly evaluate the uranium mineralization probability of each region of the research area so as to optimize the uranium-bearing region and improve the sandstone-type uranium ore exploration efficiency.
Description
Technical Field
The invention belongs to the technical field of uranium ore geological exploration, and particularly relates to a method for optimizing a sandstone-type uranium ore favorable uranium-bearing area based on uranium ore-forming elements.
Background
The sandstone-type uranium ore beneficial uranium-bearing area optimization technology can directly and effectively reduce the exploration range and define the target area, thereby guiding the exploration and development of the sandstone-type uranium ore. The formation of sandstone-type uranium deposit is a process of space-time coupling of multiple ore-forming elements. At present, most of the optimized methods for sandstone-type uranium ores in beneficial uranium-bearing areas are qualitative or semi-quantitative methods for multi-factor analysis, and accuracy and efficiency of uranium ore exploration are severely limited. Therefore, the method for quantitatively and efficiently evaluating the advantageous uranium-bearing area of the sandstone-type uranium ore is important for quickly and effectively delineating the advantageous area and improving the exploration efficiency.
Disclosure of Invention
The invention aims to provide a method for optimizing a favorable uranium-bearing area of sandstone-type uranium ore based on uranium ore forming elements, which can simply, accurately and quickly evaluate the uranium ore forming probability of each area of a research area so as to optimize the favorable uranium-bearing area and improve the exploration efficiency of the sandstone-type uranium ore.
The technical scheme adopted by the invention is as follows:
a method for optimizing beneficial uranium bearing zones of sandstone-type uranium ores based on uranium mineralization elements, comprising the following steps: step 1, determining uranium source conditions: solving the average original uranium content of the etched source region for recovery; step 2, determining uranium reservoir conditions; in step S3, uranium reservoir reduction conditions are determined; and 4, calculating a uranium mineralization probability coefficient P and optimizing a uranium-bearing area.
The step 1 specifically comprises the following steps: step 1.1, uranium source screening and sample collection; step 1.2, testing the content of uranium and thorium; and 1.3, calculating the average original uranium content and recovering.
In the step 1.1, the acid rock in screening is uranium source rock, n rock samples are collected, n is 10-20, the weight of each sample is 20-50 g, and the samples are guaranteed to be fresh and not to be weathered or polluted.
In the step 1.2, each sample is put into a sample crusher to be crushed to 200 meshes, after the crushed sample is dried for 4 hours at 60 ℃, 0.05g of the sample is accurately weighed and put into a polytetrafluoroethylene sealed sample dissolving tank, a small amount of water is firstly used for wetting, the sample is lightly vibrated to be uniform, 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid are added, and a special sample dissolving tank cover is covered; heating and dissolving for 72h at 150 ℃ on a low-temperature electric heating plate, opening a sample dissolving tank, heating and steaming on the low-temperature electric heating plate until the sample dissolving tank is nearly dry, adding 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid again according to digestion conditions to repeat the digestion process, heating and steaming on the low-temperature electric heating plate again until the sample dissolving tank is nearly dry, adding 1:1 of nitric acid and 2ml of perchloric acid, covering a special sample dissolving tank cover, and stewing for a period of time to dissolve soluble residues; diluting the sample to 50ml with high-purity water, shaking up, and measuring the uranium and thorium content of each sample on a high-resolution inductively coupled plasma mass spectrometer by adopting an online internal standard method.
In step 1.3: calculating Th according to the U and Th contents of each samplei/UiRatio kiAccording to the formula U0i＝ki×UiAnd 4.2 calculating the original uranium content of each sample, and solving by using the following formula
The step 2 specifically comprises the following steps:
step 2.1, calculating a sand-to-ground ratio r of the uranium reservoir and drawing a plane contour map: acquiring stratum thickness and sand layer thickness of the uranium reservoir by collecting and arranging drill holes and seismic data, solving a sand-to-ground ratio r of the uranium reservoir of each drill hole by utilizing the sand layer thickness/stratum thickness ratio, and drawing a sand-to-ground ratio r plane contour map of the uranium reservoir based on an interpolation method;
step 2.2, drawing a uranium reservoir porosity phi plane contour map: collecting actually-measured porosity data and porosity logging data of a drill core, and drawing a porosity phi plane contour map of the uranium reservoir based on an interpolation method;
step 2.3, drawing a uranium reservoir mudstone layer number m plane contour map: and (3) reading the number m of the uranium reservoir mudstone layers of the drill holes by collecting and arranging the drill holes and seismic data, and drawing a uranium reservoir mudstone layer number m plane contour map based on an interpolation method.
The step 3 specifically comprises the following steps:
step 3.1, sample collection and pretreatment; and 3.2, testing total organic carbon TOC and drawing a TOC plane contour map.
In the step 3.1, based on a drill core, selecting primary gray sandstone from a uranium reservoir for sample collection, spreading a sampling range on a plane as much as possible, collecting n rock samples, wherein n is 30-50, the weight of each sample is 200-300 g, and the samples are guaranteed to be fresh and not to be weathered or polluted; crushing the collected rock sample on a crusher to 200 meshes;
in the step 3.2, accurately weighing 10-20 g of the crushed sample, putting the crushed sample into a water-permeable crucible which is arranged by a tray, and slowly adding a small amount of diluted hydrochloric acid into the crucible for multiple times by a dropper until the sample does not bubble any more; adding hydrochloric acid into the tray until the liquid level is over the surface of the sample, soaking for 12h, and heating in a water bath kettle at 80 deg.C for 1h together with the tray; after heating, pouring off hydrochloric acid on the tray while the tray is hot, and beginning to dropwise add pure water to wash the crucible and the sample to be neutral; putting the treated sample into a dryer at 100 ℃ for drying, and then transferring the sample into a tester for testing TOC; and drawing a TOC plane contour map of the TOC data actually measured by each sample based on an interpolation method.
The step 4 specifically comprises the following steps: step 4.1, calculating the probability coefficient of uranium mineralization: the average original uranium content obtained by combining the previous steps
The uranium reservoir sand-to-ground ratio r, the porosity phi, the number m of mudstone layers and the total organic carbon TOC distribution characteristics of the reservoir, and the uranium mineralization probability coefficient P distribution characteristics of a target layer are calculated according to the following formula:
step 4.2, the uranium-bearing zone is optimized: and on the contour map of the uranium mineralization probability coefficient P plane, the area with P > 35% is a favorable uranium-containing area.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a quantitative method for optimizing a sandstone-type uranium ore favorable uranium-bearing area by integrating multiple ore forming elements, which can simply, conveniently, accurately and quickly evaluate the uranium ore forming probability of each area of a research area, optimize the favorable uranium-bearing area and improve the exploration accuracy of the sandstone-type uranium ore.
Drawings
Fig. 1 shows a schematic flow diagram of a method for favouring a uranium-bearing zone based on uranium mineralization elements, preferably sandstone-type uranium ores, according to an embodiment of the invention;
FIG. 2 shows a planar contour plot of uranium reservoir porosity in one embodiment;
fig. 3 shows a contour plot of the uranium mineralization probability coefficient P-plane and a preferred advantageous uranium-bearing zone in one embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present invention provides a method for optimizing a uranium-bearing zone of a sandstone-type uranium ore based on uranium mineralization elements, comprising the following steps:
step 1, determining uranium source conditions, wherein the key point is to solve the average original uranium content in an etched source region
The recovery step 1 may specifically include the following steps:
step 1.1, uranium source screening and sample collection: acid rocks are uranium source rocks in screening of a basin periphery denudation area, n rock samples are collected, n is generally 10-20, the weight of each sample is 20-50 g, and the samples are fresh and free of weathering and pollution;
step 1.2, testing the content of uranium and thorium: putting each sample into a sample crusher to crush the sample to 200 meshes, drying the crushed sample at 60 ℃ for 4 hours, accurately weighing 0.05g of the sample into a polytetrafluoroethylene sealed sample dissolving tank, wetting the sample with a small amount of water, slightly vibrating the sample to be uniform, adding 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid, and covering a special sample dissolving tank cover; heating and dissolving for 72h at 150 ℃ on a low-temperature electric heating plate, opening a sample dissolving tank, heating and steaming on the low-temperature electric heating plate until the sample is nearly dry, adding 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid again according to digestion conditions (if the sample is not completely digested), repeating the digestion process, heating and steaming on the low-temperature electric heating plate again until the sample is nearly dry, adding 1:1 of nitric acid and covering a special sample dissolving tank cover for stewing for a period of time to dissolve soluble residues. Diluting to 50ml with high-purity water, shaking, and measuring uranium (U) of each sample by using an online internal standard (10ng/ml Rh standard solution) method on a high-resolution inductively coupled plasma mass spectrometer (ICP-MS)i) And thorium (Th)i) And (4) content.
Step 1.3 average original uranium content
And (3) recovering: calculating Th according to the U and Th contents of each samplei/UiRatio kiAccording to the formula U0i＝ki×UiAnd 4.2 calculating the original uranium content of each sample, and solving by using the following formula
And 2, determining the uranium reservoir conditions. Step S2 may specifically include the following steps:
step 2.1, calculating a sand-to-ground ratio r of the uranium reservoir and drawing a plane contour map: the method comprises the steps of acquiring stratum thickness and sand layer thickness of a uranium reservoir by collecting and sorting drilled holes and seismic data, solving a sand-to-ground ratio r of the uranium reservoir of each drilled hole by using the sand layer thickness/stratum thickness ratio, and then drawing a sand-to-ground ratio r plane contour map of the uranium reservoir by using Surfer software based on an interpolation method;
step 2.2, drawing a uranium reservoir porosity (phi) plane contour map: FIG. 2 shows a planar contour map of uranium reservoir porosity in one embodiment, which is a planar contour map of uranium reservoir porosity (Φ) drawn by Surfer software based on interpolation by collecting actually measured porosity data and porosity log data of a drill core;
step 2.3, drawing a uranium reservoir mudstone layer number (m) plane contour map: the method comprises the steps of collecting and sorting drill holes and seismic data, reading the number m of uranium reservoir mudstone layers of each drill hole, and drawing a uranium reservoir mudstone layer number m plane contour map by utilizing Surfer software based on an interpolation method.
In step S3, uranium reservoir reduction conditions are determined. Step S3 may specifically include the following steps:
step 3.1, sample collection and pretreatment: based on a drill core, selecting primary gray sandstone from a uranium reservoir for sample collection, spreading a sampling range on a plane as much as possible, collecting n rock samples, wherein n is generally 30-50, the weight of each sample is 200-300 g, and the samples are guaranteed to be fresh and not to be weathered or polluted; crushing the collected rock sample on a crusher to 200 meshes;
step 3.2, testing Total Organic Carbon (TOC) and drawing a TOC plane contour map: accurately weighing 10-20 g of the crushed sample, putting the crushed sample into a water-permeable crucible which is arranged by a tray, and slowly adding a small amount of diluted hydrochloric acid into the crucible for multiple times by a dropper until the sample does not bubble any more; adding hydrochloric acid into the tray until the liquid level is over the surface of the sample, soaking for 12h, and heating in 80 deg.C water bath together with the tray for 1 h. After heating, the hydrochloric acid on the tray is poured off while the tray is hot, and the crucible and the sample are washed to be neutral by dropwise adding pure water. Putting the treated sample into a dryer at 100 ℃ for drying, and then transferring the sample into an ELTRACS-800 tester for testing TOC; and drawing a TOC plane contour map by using Surfer software based on interpolation of actually measured TOC data of each sample.
In step S4, a uranium mineralization probability coefficient P is calculated and the uranium-bearing zone is favored. Step S4 may specifically include the following steps:
step 4.1, calculating the probability coefficient of uranium mineralization: the average original uranium content obtained by combining the previous steps
The method comprises the following steps of calculating the uranium mineralization probability coefficient P distribution characteristics of a target layer according to the following formula by utilizing a layer operation module of Trinity software according to the uranium sand-to-ground ratio r, the porosity (phi), the number (m) of mudstone layers and the Total Organic Carbon (TOC) distribution characteristics of a reservoir:
step 4.2, the uranium-bearing zone is optimized: FIG. 3 shows a contour plot of the uranium mineralization probability coefficient P-plane and a preferred advantageous uranium-bearing zone in one embodiment; as shown in fig. 3, according to the calculated uranium mineralization probability coefficient P, an interpolation method is used to draw a uranium mineralization probability coefficient P plane contour map, and the map is divided into 5 exploration areas with different risk levels, such as a very high risk area, a medium risk area, a low risk area and a very low risk area, according to the following criteria (table 1):
TABLE 1 sandstone-type uranium mine exploration risk classification table
| Risk stratification | Very high risk | High risk | Middle risk | Low risk | Very low risk |
| Coefficient of mineralization probability P | <10％ | 10～20％ | 20～35％ | 35～50％ | >50％ |
Wherein the low-risk and very low-risk regions are preferably favorable uranium-containing regions, i.e. the regions with P > 35% on the contour plot of the P-plane of the probability coefficient of uranium mineralization are favorable uranium-containing regions (the regions shaded in fig. 3 are favorable uranium-containing regions).
The execution order of the above steps S101, S102, and S103 may be arbitrary, but the step S104 must be the last step. According to the specific implementation steps of the embodiment of the invention, quantitative calculation can be carried out on the uranium mineralization probability of any block, so that the favorable uranium-containing area can be rapidly and accurately selected.
The method and the device are based on sandstone-type uranium ore uranium source conditions, uranium reservoir conditions and uranium reservoir reduction conditions, the uranium mineralization probability P is calculated quantitatively, and then the favorable uranium-containing area is selected quickly and accurately. The method can quantitatively evaluate the uranium mineralization probability of each region of the research area so as to preferably select the uranium-bearing region and improve the sandstone-type uranium ore exploration efficiency.
The scheme provided by the embodiment of the invention is suitable for all sandstone-type uranium ores, is suitable for early-stage uranium ore exploration areas and late-stage exploration mature development areas, and can quantitatively evaluate the uranium mineralization probability of each area of a research area so as to preferably select the uranium-bearing area and evaluate the target area prediction of the sandstone-type uranium ores.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A method for optimizing a beneficial uranium-bearing area of sandstone-type uranium ore based on uranium ore forming elements is characterized by comprising the following steps: the method comprises the following steps: step 1, determining uranium source conditions: solving the average original uranium content of the etched source region for recovery; step 2, determining uranium reservoir conditions; in step S3, uranium reservoir reduction conditions are determined; and 4, calculating a uranium mineralization probability coefficient P and optimizing a uranium-bearing area.
2. A method according to claim 1, characterized in that it consists in: the step 1 specifically comprises the following steps: step 1.1, uranium source screening and sample collection; step 1.2, testing the content of uranium and thorium; and 1.3, calculating the average original uranium content and recovering.
3. A method according to claim 2, characterized in that the uranium mining elements are based on a uranium favored uranium zone of uranium ore, preferably sandstone-type uranium ore: in the step 1.1, the acid rock in screening is uranium source rock, n rock samples are collected, n is 10-20, the weight of each sample is 20-50 g, and the samples are guaranteed to be fresh and not to be weathered or polluted.
4. A method according to claim 2, characterized in that the uranium mining elements are based on a uranium favored uranium zone of uranium ore, preferably sandstone-type uranium ore: in the step 1.2, each sample is put into a sample crusher to be crushed to 200 meshes, after the crushed sample is dried for 4 hours at 60 ℃, 0.05g of the sample is accurately weighed and put into a polytetrafluoroethylene sealed sample dissolving tank, a small amount of water is firstly used for wetting, the sample is lightly vibrated to be uniform, 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid are added, and a special sample dissolving tank cover is covered; heating and dissolving for 72h at 150 ℃ on a low-temperature electric heating plate, opening a sample dissolving tank, heating and steaming on the low-temperature electric heating plate until the sample dissolving tank is nearly dry, adding 3ml of hydrofluoric acid, 1ml of nitric acid and 1ml of perchloric acid again according to digestion conditions to repeat the digestion process, heating and steaming on the low-temperature electric heating plate again until the sample dissolving tank is nearly dry, adding 1:1 of nitric acid and 2ml of perchloric acid, covering a special sample dissolving tank cover, and stewing for a period of time to dissolve soluble residues; diluting the sample to 50ml with high-purity water, shaking up, and measuring the uranium and thorium content of each sample on a high-resolution inductively coupled plasma mass spectrometer by adopting an online internal standard method.
5. A method according to claim 2, characterized in that the uranium mining elements are based on a uranium favored uranium zone of uranium ore, preferably sandstone-type uranium ore: in step 1.3: calculating Th according to the U and Th contents of each samplei/UiRatio kiAccording to the formula U0i＝ki×UiAnd 4.2 calculating the original uranium content of each sample, and solving by using the following formula
6. A method according to claim 1, characterized in that it consists in: the step 2 specifically comprises the following steps:
step 2.1, calculating a sand-to-ground ratio r of the uranium reservoir and drawing a plane contour map: acquiring stratum thickness and sand layer thickness of the uranium reservoir by collecting and arranging drill holes and seismic data, solving a sand-to-ground ratio r of the uranium reservoir of each drill hole by utilizing the sand layer thickness/stratum thickness ratio, and drawing a sand-to-ground ratio r plane contour map of the uranium reservoir based on an interpolation method;
step 2.2, drawing a uranium reservoir porosity phi plane contour map: collecting actually-measured porosity data and porosity logging data of a drill core, and drawing a porosity phi plane contour map of the uranium reservoir based on an interpolation method;
step 2.3, drawing a uranium reservoir mudstone layer number m plane contour map: and (3) reading the number m of the uranium reservoir mudstone layers of the drill holes by collecting and arranging the drill holes and seismic data, and drawing a uranium reservoir mudstone layer number m plane contour map based on an interpolation method.
7. A method according to claim 1, characterized in that it consists in: the step 3 specifically comprises the following steps:
step 3.1, sample collection and pretreatment; and 3.2, testing total organic carbon TOC and drawing a TOC plane contour map.
8. Method of favouring uranium containing zones based on uranium mineralization elements, preferably sandstone-type uranium ores, according to claim 7, characterized in that: in the step 3.1, based on a drill core, selecting primary gray sandstone from a uranium reservoir for sample collection, spreading a sampling range on a plane as much as possible, collecting n rock samples, wherein n is 30-50, the weight of each sample is 200-300 g, and the samples are guaranteed to be fresh and not to be weathered or polluted; the collected rock samples were crushed to 200 mesh on a crusher.
9. Method of favouring uranium containing zones based on uranium mineralization elements, preferably sandstone-type uranium ores, according to claim 7, characterized in that: in the step 3.2, accurately weighing 10-20 g of the crushed sample, putting the crushed sample into a water-permeable crucible which is arranged by a tray, and slowly adding a small amount of diluted hydrochloric acid into the crucible for multiple times by a dropper until the sample does not bubble any more; adding hydrochloric acid into the tray until the liquid level is over the surface of the sample, soaking for 12h, and heating in a water bath kettle at 80 deg.C for 1h together with the tray; after heating, pouring off hydrochloric acid on the tray while the tray is hot, and beginning to dropwise add pure water to wash the crucible and the sample to be neutral; putting the treated sample into a dryer at 100 ℃ for drying, and then transferring the sample into a tester for testing TOC; and drawing a TOC plane contour map of the TOC data actually measured by each sample based on an interpolation method.
10. A method according to claim 1, characterized in that it consists in: the step 4 specifically comprises the following steps: step 4.1, calculating the probability coefficient of uranium mineralization: the average original uranium content obtained by combining the previous steps
The uranium reservoir sand-to-ground ratio r, the porosity phi, the number m of mudstone layers and the total organic carbon TOC distribution characteristics of the reservoir, and the uranium mineralization probability coefficient P distribution characteristics of a target layer are calculated according to the following formula:
step 4.2, the uranium-bearing zone is optimized: and on the contour map of the uranium mineralization probability coefficient P plane, the area with P > 35% is a favorable uranium-containing area.
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