CN111738562A - Method for selecting dominant horizon of sandstone uranium ore - Google Patents
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 37
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004927 clay Substances 0.000 claims abstract description 29
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 24
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 17
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052622 kaolinite Inorganic materials 0.000 claims abstract description 16
- 230000003595 spectral effect Effects 0.000 claims abstract description 8
- 238000001228 spectrum Methods 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 4
- 239000011707 mineral Substances 0.000 claims abstract description 4
- 239000005416 organic matter Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 8
- 238000002310 reflectometry Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000013139 quantization Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003041 laboratory chemical Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The invention belongs to the field of uranium mine exploration, and particularly discloses a method for selecting a dominant horizon of a sandstone uranium mine, which comprises the following steps: performing hyperspectral core scanning on a drilling core of a sandstone uranium deposit by using core hyperspectral scanning equipment; performing data inversion on the hyperspectral rock core scanning image to obtain ferric iron, organic matters, the total clay content and the kaolinite content; constructing a relation curve of mineral content changing along with depth by utilizing data such as ferric iron content obtained by inversion and combining with scanning depth; and selecting the dominant horizon of the sandstone uranium ore by using the constructed content change curve. The method does not need to collect samples, and has simple operation steps; laboratory analysis is not required to be carried out, and the working efficiency is improved; the characteristic of strong spectrum quantization capability is fully utilized, and the result quantization level is good; the spectral data is easy to obtain, the test is cheap, and the cost can be saved.
Description
Technical Field
The invention belongs to the field of uranium mine exploration, and particularly discloses a method for selecting a dominant horizon of a sandstone uranium mine.
Background
Uranium is an important dual-purpose resource for military and civilian use. Currently, exploration of uranium ores has changed from hard rock type uranium ores to sandstone type uranium ores. Different from the traditional hard rock type uranium ore, the sandstone type uranium ore has obvious stratum control effect. The beneficial horizon for mastering the mineralization of the sandstone uranium ore has positive significance for guiding the sandstone uranium ore exploration. At present, researchers judge that the favorable sand layer is mainly based on the deposition characteristics of sand, such as the factors of the deposition sequence of the formation sand, the sandstone granularity, the organic matter content of the sand, the clay content, the iron oxide composition and the like are comprehensively considered.
There are two disadvantages in performing comprehensive evaluation:
(1) the method is excessively dependent on empirical judgment, different researchers can obtain different evaluation standards due to self reasons, so that the final evaluation result is lack of uniformity, and the result can be poor in specific energy;
(2) researchers need to carry out sample collection and laboratory chemical analysis when obtaining content and composition information, which not only wastes time and labor, but also consumes a large amount of expenses.
Therefore, a mode of combining spectral quantization inversion with index comprehensive judgment is needed to be provided for selecting the dominant horizon of the sandstone uranium deposit so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a method for selecting a dominant horizon of a sandstone uranium deposit, which makes full use of the characteristics of high spectral measurement speed and strong quantization capacity, thereby improving the quantization level of results and improving the working efficiency. Meanwhile, the spectrum is easy to obtain, the measurement price is low, and the cost can be effectively saved.
The technical scheme for realizing the purpose of the invention is as follows:
a method for selecting a dominant horizon in a sandstone uranium deposit, the method comprising the steps of:
the method comprises the following steps that (1) hyperspectral rock core scanning is conducted on a drilling rock core of a sandstone uranium deposit by utilizing rock core hyperspectral scanning equipment;
performing data inversion on the hyperspectral rock core scanning image in the step (1) to obtain the content of ferric iron, the content of organic matters, the content of total clay and the content of kaolinite;
step 3, constructing a relation curve of mineral content changing along with depth by utilizing data of ferric iron content, organic matter content, total clay content, kaolinite content and the like obtained by inversion in the step 2 and combining scanning depth;
and (4) selecting the dominant horizon of the sandstone uranium ore by using the content change curve constructed in the step (3).
And (2) the core hyperspectral scanning equipment in the step (1) is semi-imaging type (true color photo + spectrum measurement) core scanning equipment.
In the step (1), the core scanning device is required to be capable of recording the position and the corresponding depth of the spectral measurement.
In the step (2), the content of ferric iron (Fe)2O3) The inversion formula of (c) is as follows:
Fe2O3=-234.23*[R545 2-1]/2R545 2+0.4516
wherein R is545Representing a reflectivity at 545 nm.
In the step (2), an inversion formula of the organic matter content (TOC) is as follows:
TOC=-1230.8*[R823 2-1]/2R823 2+0.1408
wherein R is823Representing the reflectance at 823 nm.
In the step (2), the inversion formula of the total Clay content (Clay) is as follows:
Clay=34107*[R1878 2-1]/2R1878 2+7.3134
wherein R is1878Representing a reflectivity at 1878 nm.
In the step (2), an inversion formula of the kaolinite content (Kao) is as follows:
Kao=10245*[R2145 2-1]/2R2145 2+0.5073
wherein R is2145Representing a reflectivity at 2145 nm.
In the step (3), an Excel software is used for making a graph of content-to-depth variation according to the depth recorded by the core scanner in the step (1) from the ferric iron content (Fe2O3), the organic matter content (TOC), the total Clay content (Clay) and the kaolinite content (Kao) calculated in the step (2).
In the step (4), the dominant horizon of sandstone uranium ore is selected according to the following steps:
the dominant horizon is as follows: ferric iron decrease, organic matter increase, total clay increase, kaolinite increase;
the more dominant layer position: ferric iron decreased and total clay increased.
The invention has the following beneficial effects:
(1) the invention does not need to collect samples, so the operation steps are simple;
(2) according to the invention, laboratory analysis is not required, a large amount of analysis time is saved, and the working efficiency is improved;
(3) the invention fully utilizes the characteristic of strong spectrum quantization capability, and the result quantization level is good;
(4) the spectrum of the invention can be realized by using the existing software function in the processing process without technical barriers;
(5) the invention has the advantages of easy acquisition of spectral data, cheap test and cost saving.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention provides a method for selecting a dominant horizon of a sandstone uranium ore, which comprises the following steps:
the method comprises the following steps that (1) hyperspectral rock core scanning is conducted on a drilling rock core of a sandstone uranium deposit by utilizing rock core hyperspectral scanning equipment;
and (3) acquiring hyperspectral data of the rock core and the depth corresponding to the spectral measurement position by using a semi-imaging type (true color picture + spectral measurement) rock core scanning device.
Performing data inversion on the hyperspectral rock core scanning image in the step (1) to obtain the content of ferric iron, the content of organic matters, the content of total clay and the content of kaolinite;
trivalent iron (Fe)2O3) The inversion formulas for organics (TOC), total Clay (Clay) and kaolinite content (Kao) are as follows:
Fe2O3=-234.23*[R545 2-1]/2R545 2+0.4516
TOC=-1230.8*[R823 2-1]/2R823 2+0.1408
Clay=34107*[R1878 2-1]/2R1878 2+7.3134
Kao=10245*[R2145 2-1]/2R2145 2+0.5073
wherein R is545,R823,R1878,R2145Representing the reflectivity at 545,823,1878,2145 nm.
Step 3, constructing a relation curve of the mineral content changing along with the depth by utilizing the data of the ferric iron content, the organic matter content, the total clay content, the kaolinite content and the like obtained by inversion in the step 2 and combining with the scanning depth;
using Excel software to calculate the content (Fe) of the ferric iron calculated in the step (2)2O3) And (2) making a graph of content-to-depth variation according to the depth recorded by the core scanner in the step (1) and according to the organic matter content (TOC), the total Clay content (Clay) and the kaolinite content (Kao).
And (4) selecting the dominant horizon of the sandstone uranium ore by using the content change curve constructed in the step (3).
The judgment is carried out according to the following criteria:
the dominant horizon is as follows: ferric iron decrease, organic matter increase, total clay increase, kaolinite increase;
the more dominant layer position: ferric iron decreased and total clay increased.
Researchers develop work in inner Mongolia Tongliao areas by using the technical method provided by the invention, and through the method, 1 dominant layer is identified in a plurality of drill holes, and 2 dominant layers are identified in partial drill holes, so that a good application effect is achieved.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (9)
1. A method for selecting a dominant horizon of a sandstone uranium ore is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps that (1) hyperspectral rock core scanning is conducted on a drilling rock core of a sandstone uranium deposit by utilizing rock core hyperspectral scanning equipment;
performing data inversion on the hyperspectral rock core scanning image in the step (1) to obtain the content of ferric iron, the content of organic matters, the content of total clay and the content of kaolinite;
step 3, constructing a relation curve of mineral content changing along with depth by utilizing data of ferric iron content, organic matter content, total clay content, kaolinite content and the like obtained by inversion in the step 2 and combining scanning depth;
and (4) selecting the dominant horizon of the sandstone uranium ore by using the content change curve constructed in the step (3).
2. The method of selecting a dominant horizon in a sandstone uranium deposit according to claim 1, wherein: and (2) the core hyperspectral scanning equipment in the step (1) is semi-imaging type (true color photo + spectrum measurement) core scanning equipment.
3. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 2, wherein: in the step (1), the core scanning device is required to be capable of recording the position and the corresponding depth of the spectral measurement.
4. The method of selecting a dominant horizon in a sandstone uranium deposit according to claim 3, wherein: in the step (2), the content of ferric iron (Fe)2O3) The inversion formula of (c) is as follows:
Fe2O3=-234.23*[R545 2-1]/2R545 2+0.4516
wherein R is545Representing a reflectivity at 545 nm.
5. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 4, wherein: in the step (2), an inversion formula of the organic matter content (TOC) is as follows:
TOC=-1230.8*[R823 2-1]/2R823 2+0.1408
wherein R is823Representing the reflectance at 823 nm.
6. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 5, wherein: in the step (2), the inversion formula of the total Clay content (Clay) is as follows:
Clay=34107*[R1878 2-1]/2R1878 2+7.3134
wherein R is1878Representing a reflectivity at 1878 nm.
7. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 6, wherein: in the step (2), an inversion formula of the kaolinite content (Kao) is as follows:
Kao=10245*[R2145 2-1]/2R2145 2+0.5073
wherein R is2145Representing a reflectivity at 2145 nm.
8. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 7, wherein: in the step (3), an Excel software is used for making a graph of content-to-depth variation according to the depth recorded by the core scanner in the step (1) from the ferric iron content (Fe2O3), the organic matter content (TOC), the total Clay content (Clay) and the kaolinite content (Kao) calculated in the step (2).
9. The method of selecting a dominant horizon for a sandstone uranium deposit according to claim 8, wherein: in the step (4), the dominant horizon of sandstone uranium ore is selected according to the following steps:
the dominant horizon is as follows: ferric iron decrease, organic matter increase, total clay increase, kaolinite increase;
the more dominant layer position: ferric iron decreased and total clay increased.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114993759A (en) * | 2022-07-18 | 2022-09-02 | 核工业北京地质研究院 | Rock powder sampling method for radioactive mineral exploration |
CN117723579A (en) * | 2024-02-07 | 2024-03-19 | 核工业北京地质研究院 | Method for determining sandstone type uranium deposit mineralization site in exploration area through mineral combination |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114993759A (en) * | 2022-07-18 | 2022-09-02 | 核工业北京地质研究院 | Rock powder sampling method for radioactive mineral exploration |
CN114993759B (en) * | 2022-07-18 | 2022-10-25 | 核工业北京地质研究院 | Rock powder sampling method for radioactive mineral exploration |
CN117723579A (en) * | 2024-02-07 | 2024-03-19 | 核工业北京地质研究院 | Method for determining sandstone type uranium deposit mineralization site in exploration area through mineral combination |
CN117723579B (en) * | 2024-02-07 | 2024-05-28 | 核工业北京地质研究院 | Method for determining sandstone type uranium deposit mineralization site in exploration area through mineral combination |
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