CN109596536B - Method for searching potential ultra-large sandstone uranium deposit based on remote sensing image - Google Patents
Method for searching potential ultra-large sandstone uranium deposit based on remote sensing image Download PDFInfo
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Abstract
The invention belongs to the field of remote sensing geology, and particularly discloses a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image, which comprises the following steps: step 1, performing terrain modeling by using DEM data, and searching for an area with a terrain integrally inclined in a one-way manner; step 2, performing river channel or ancient river channel interpretation on the one-way inclined area interpreted in the step 1 by using multispectral remote sensing data, and further searching an area where a river channel is folded; step 3, searching a source area upstream along a river course; step 4, carrying out lithology and alteration mapping in the source region by using the multispectral remote sensing data, and determining the rock type of the source region and the area of an alteration region; and 5, determining the region where the water body in the downstream region is gathered as a potential forming region of the ultra-large sandstone uranium ore, wherein the source region is a region which passes through the aluminum granite and has a large alteration range. The invention has the advantages that: the evaluation work of the uranium deposit can be carried out without the limitation of regions and national boundaries.
Description
Technical Field
The invention belongs to the technical field of remote sensing geology, and particularly relates to a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image.
Background
Uranium ore is grain in nuclear industry, and sandstone-type uranium ore is one of important sources of uranium resources. The remote sensing technology has the advantages of no regional and national limit, and has positive significance for transnational and transregional uranium resource evaluation. Currently, many mature technologies are used for positioning porphyry-type ore deposits such as copper, molybdenum, tungsten, tin, gold and the like by using a remote sensing technology, but the technology for searching the sandstone-type uranium ores is lacked, and the main reason is that the sandstone-type uranium ores do not have the characteristics of altered zones and altered halos of the traditional porphyry-type ore deposits. Aiming at the technical blank, the patent provides a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image.
Disclosure of Invention
The technical problems solved by the invention are as follows: the invention provides a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image, and particularly relates to a method for delineating a favorable area which can possibly form the ultra-large sandstone uranium deposit from the remote sensing image by carrying out remote sensing image analysis.
The technical scheme adopted by the invention is as follows:
a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image comprises the following steps:
step 1, performing terrain modeling by using DEM data, and searching for an area with a terrain integrally inclined in a one-way manner;
step 2, performing river channel or ancient river channel interpretation on the one-way inclined area interpreted in the step 1 by using multispectral remote sensing data, and further searching an area where a river channel is folded;
step 3, searching a source area upstream along a river course;
step 4, carrying out lithology and alteration mapping in the source region by using the multispectral remote sensing data, and determining the rock type of the source region and the area of an alteration region;
and 5, determining the region where the water body in the downstream region is gathered as a potential forming region of the ultra-large sandstone uranium ore, wherein the source region is a region which passes through the aluminum granite and has a large alteration range.
The DEM used in the step 1 is an ASTER DEM with the resolution of 30 m.
The multispectral remote sensing data used in the step 2 are ASTER and Landsat data, and two methods of visual interpretation and hydroxyl information extraction and identification are adopted for judging the river channel and the ancient river channel.
And 4, extracting lithology and alteration information by mainly using a spectral angle, principal component analysis and multi-source information integration method.
The invention has the beneficial effects that:
the method disclosed by the invention can be used for delineating a favorable area which can possibly form the ultra-large sandstone uranium ore from the remote sensing image by carrying out remote sensing image analysis.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention provides a method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image, which comprises the following steps:
step 1, loading DEM data by using ENVI software, wherein the data type is ASTER DEM, the resolution is 30m, forming a terrain elevation map by using density segmentation, and searching an area with a one-way inclination of the whole terrain from the map.
Step 2, loading ASTER and Landsat data by using ENVI software, carrying out visual interpretation by using an ENVI visualization module, extracting hydroxyl information by using the short wave infrared bands of Landsat and ASTER, identifying a river channel and an ancient river channel, and further searching a region where the river channel is folded and converged;
step 3, utilizing the visualization function of the ENVI software to trace the river channel and the ancient river channel in the step 2 and find an upstream source area;
and 4, filling by using a visualization and digital filling module of the ENVI software and taking different rock and altered mineral curves in a spectral library as standards, using spectral angles and main components to perform filling, collecting related geological data to perform integrated research on multi-source data, displaying rock distribution by using the visualization function of the ENVI, and counting the area of an altered area by using the statistical function. (ii) a
And 5, comprehensively researching the elevation map in the step 1 and the rock and the alteration map in the step 4, selecting an area with a large alteration range and a source area of aluminum-coated granite, and judging an area with gathered water in a downstream area as a potential forming area of the ultra-large sandstone uranium ore.
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 (4)
1. A method for searching a potential ultra-large sandstone uranium deposit based on a remote sensing image is characterized by comprising the following steps:
the method comprises the following steps:
step (1), performing terrain modeling by using DEM data, and searching for an area with a terrain integrally inclined in one direction;
step (2), the river channel or the ancient river channel is interpreted in the one-way inclined area interpreted in the step (1) by using multispectral remote sensing data, and an area where the river channel is folded is further searched;
step (3), searching a source area upstream along a river course;
step (4), carrying out lithology and alteration mapping in the source region by using multispectral remote sensing data, and determining the rock type of the source region and the area of an alteration region;
and (5) determining the region where the water body in the downstream region is gathered as a potential forming region of the ultra-large sandstone uranium ore, wherein the source region is a region which passes through the aluminum granite and has a large alteration range.
2. The method for finding the potential ultra-large sandstone uranium deposit based on the remote sensing image as claimed in claim 1, wherein the DEM used in the step (1) is an ASTER DEM with the resolution of 30 m.
3. The method for finding the potential ultra-large sandstone uranium deposit based on the remote sensing image as claimed in claim 1, wherein the multispectral remote sensing data used in the step (2) are ASTER and Landsat data, and the judgment of the river channel and the ancient river channel comprises two methods of visual interpretation and hydroxyl information extraction and identification.
4. The method for finding the potential ultra-large sandstone uranium deposit based on the remote sensing image as claimed in claim 1, wherein in the step (4), the lithology and alteration filling map uses spectral angles, principal component analysis and a multi-source information integration method.
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| CN111060456B (en) * | 2019-12-27 | 2022-09-20 | 核工业北京地质研究院 | Method for identifying sandstone uranium ore structure excretion zone by using remote sensing image |
| CN111045091B (en) * | 2019-12-31 | 2022-01-07 | 核工业北京地质研究院 | Recognition and positioning method for ancient river channel covered by basalt |
| CN113034645B (en) * | 2021-03-23 | 2021-09-03 | 中国地质科学院地质力学研究所 | Lithologic map filling method, device and storage medium |
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