CN108228920B - Sandstone-type uranium ore soil uranium element abnormity screening method - Google Patents
Sandstone-type uranium ore soil uranium element abnormity screening method Download PDFInfo
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Abstract
The invention belongs to the field of geological exploration, and particularly relates to a sandstone-type uranium ore soil uranium element anomaly screening method. The method comprises the following steps: step one, eliminating earth surface landscape interference; step two, drawing a geochemical abnormal diagram of uranium elements; step three, obtaining a uranium abnormal area excluding human activity interference; step four, obtaining a uranium abnormal area without terrain interference; fifthly, obtaining a uranium abnormal area excluding geologic body interference; and step six, grading the uranium abnormal region obtained in the step five. According to the invention, through a set of complete anomaly screening process, the influence of interference factors in multiple aspects is rapidly removed, and mine-induced anomalies are extracted, so that a favorable basis is provided for the prediction work of the finished ore.
Description
Technical Field
The invention belongs to the field of geological exploration, and particularly relates to a sandstone-type uranium ore soil uranium element anomaly screening method.
Background
The upper part of the sandstone-type uranium ore is usually covered by a thicker fourth series stratum, and the application of soil chemical exploration to extract deep uranium mineralization information is one of the main methods for sandstone-type uranium ore exploration. Most of the extracted uranium element anomalies are not ore-induced anomalies, and the uranium element from a deep ore body is susceptible to various factors during surface enrichment, including surface landscape differences, surface water scouring, human activities, geological body differences and the like. These factors can change the abnormal form of uranium to a great extent, cause more false exceptions, and if objective exception screening is not carried out, cause great interference to the work of finding ores.
Disclosure of Invention
The invention aims to provide a sandstone-type uranium ore soil uranium element abnormity screening method, and aims to rapidly remove influences of interference factors in various aspects through a set of complete abnormity screening process, extract ore-induced abnormity and provide a favorable basis for ore formation prediction work.
In order to solve the technical problem, the invention provides a method for screening abnormal uranium element in sandstone-type uranium ore soil, which comprises the following steps:
the method comprises the following steps of firstly, eliminating interference of surface landscape, obtaining a high-resolution remote sensing image of a research area, interpreting surface vegetation types, dividing the surface landscape of the research area by combining ground sampling records, and leveling original uranium discrete data among different landscape areas;
step two, gridding the leveled discrete data in the step one, setting an abnormal lower limit, and drawing a uranium element geochemical abnormal graph;
identifying a non-ore-induced abnormal area caused by human activities to obtain a uranium abnormal area excluding human activity interference;
identifying a non-ore-induced abnormal area caused by terrain in the uranium abnormal area excluding human activity interference obtained in the step three to obtain the uranium abnormal area excluding terrain interference;
step five, identifying a non-ore-induced abnormal area caused by the geologic body in the uranium abnormal area obtained in the step four after the topographic interference is eliminated; superposing the uranium abnormal area obtained in the fourth step with a geological map of a research area, and if the uranium abnormal area is superposed with a stratum before a recent system in a geological age, identifying the abnormality as a non-mineralogical abnormality to obtain a uranium abnormal area excluding geologic body interference;
and step six, grading the uranium abnormal region obtained in the step five.
And thirdly, obtaining a uranium abnormal area excluding human activity interference, specifically, interpreting plant, village and road information of the research area by using a high-resolution image, marking the plant and the village as point files on a graph, marking the road as a line file, respectively performing buffer area analysis on the point and the line file, performing superposition analysis on the buffer area and the uranium abnormal area obtained in the second step, and identifying the uranium abnormal area superposed with the buffer area as a non-mineralizing abnormal area.
In the fourth step, the method for identifying the non-minerally induced abnormal area caused by the terrain comprises the steps of calculating indexes of flow direction, flow and gradient by acquiring digital model data of the ground height of a research area, establishing a ground surface water system distribution diagram on the basis of the indexes, performing buffer area analysis on a line file of a water system, performing superposition analysis on the water system buffer area and the uranium abnormal area obtained in the third step, and identifying the uranium abnormal area which is consistent with the distribution range and the extension direction of the water system buffer area as the non-minerally induced abnormal area.
In the sixth step, the grading method is to stack the uranium abnormal area and the geological mineralization elements, and the grading standard is as follows: the uranium abnormal areas which are overlapped with the ranges of the 3 geological mineral forming elements are marked as A-type abnormalities; the uranium anomaly region which is overlapped with the geological mineral forming element range of 1-2 is marked as a B-type anomaly; the uranium anomaly region that does not coincide with the range of geological mineralizing elements is marked as a class C anomaly.
In the sixth step, the geological mineral elements comprise a mineral-containing construction sedimentation system, a secondary hump structure and an oxidation-reduction transition zone range.
The invention has the beneficial technical effects that: the sandstone-type uranium ore soil uranium element abnormity screening method provided by the invention can reduce the influence of interference information to a greater extent, eliminate non-ore-caused abnormity, narrow the ore finding range and save the ore finding cost.
Detailed Description
The present invention will be described in further detail with reference to examples.
A method for screening uranium element abnormality in sandstone-type uranium ore soil comprises the following steps:
the method comprises the following steps of firstly, eliminating interference of surface landscape, obtaining a high-resolution remote sensing image of a research area, interpreting surface vegetation types, dividing the surface landscape of the research area by combining ground sampling records, and leveling original uranium discrete data among different landscape areas;
step two, gridding the leveled discrete data in the step one, and drawing a uranium element geochemical anomaly map by taking the sum of the average uranium content and the two times of mean square error as an anomaly lower limit;
identifying a non-ore-induced abnormal area caused by human activities to obtain a uranium abnormal area excluding human activity interference; specifically, the plant, village and road information of a research area are interpreted by applying a high-resolution image, the plant and village are marked as point files on a graph, the road is marked as a line file, the point and line files are respectively subjected to buffer area analysis, the radius of the point file buffer area is 800 meters, the width of the line file buffer area is 100 meters, the buffer area and the uranium abnormal area obtained in the step two are subjected to superposition analysis, and the uranium abnormal area which is superposed with the buffer area is identified as a non-mineralizing abnormal area;
identifying a non-ore-induced abnormal area caused by terrain in the uranium abnormal area excluding human activity interference obtained in the step three to obtain the uranium abnormal area excluding terrain interference; the method for identifying the non-mineral abnormal area caused by the terrain comprises the steps of calculating indexes of flow direction, flow and gradient in GIS software by acquiring data of a ground elevation digital model (DEM) of a research area, establishing a surface water system (including seasonal water) distribution diagram on the basis, and analyzing line files of the water system by a buffer area, wherein the width of the buffer area is 600 meters; performing superposition analysis on the water system buffer area and the uranium abnormal area obtained in the third step, and identifying the uranium abnormal area which is consistent with the water system buffer area in distribution range and extension direction as a non-ore abnormal area;
step five, identifying a non-ore-induced abnormal area caused by the geologic body in the uranium abnormal area obtained in the step four after the topographic interference is eliminated; superposing the uranium abnormal area obtained in the fourth step with a geological map of a research area, and if the uranium abnormal area is superposed with a stratum before a recent system in a geological age, identifying the abnormality as a non-mineralogical abnormality to obtain a uranium abnormal area excluding geologic body interference;
step six, grading the uranium abnormal area obtained in the step five; stacking the uranium abnormal area and geological mineral elements, wherein the geological mineral elements comprise an ore-containing construction sedimentation system, a secondary hump and valley structure and an oxidation-reduction transition zone range, and the classification standard is as follows: the uranium abnormal areas which are overlapped with the ranges of the 3 geological mineral forming elements are marked as A-type abnormalities; the uranium anomaly region which is overlapped with the geological mineral forming element range of 1-2 is marked as a B-type anomaly; the uranium anomaly region that does not coincide with the range of geological mineralizing elements is marked as a class C anomaly.
Claims (5)
1. A method for screening abnormal uranium element in sandstone-type uranium ore soil is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps of firstly, eliminating interference of surface landscape, obtaining a high-resolution remote sensing image of a research area, interpreting surface vegetation types, dividing the surface landscape of the research area by combining ground sampling records, and leveling original uranium discrete data among different landscape areas;
step two, gridding the leveled discrete data in the step one, setting an abnormal lower limit, and drawing a uranium element geochemical abnormal graph;
identifying a non-ore-induced abnormal area caused by human activities to obtain a uranium abnormal area excluding human activity interference;
identifying a non-ore-induced abnormal area caused by terrain in the uranium abnormal area excluding human activity interference obtained in the step three to obtain the uranium abnormal area excluding terrain interference;
step five, identifying a non-ore-induced abnormal area caused by the geologic body in the uranium abnormal area obtained in the step four after the topographic interference is eliminated; superposing the uranium abnormal area obtained in the fourth step with a geological map of a research area, and if the uranium abnormal area is superposed with a stratum before a recent system in a geological age, identifying the abnormality as a non-mineralogical abnormality to obtain a uranium abnormal area excluding geologic body interference;
and step six, grading the uranium abnormal region obtained in the step five.
2. The method for screening uranium element abnormality in sandstone-type uranium ore soil according to claim 1, wherein the method comprises the following steps: and in the third step, obtaining a uranium abnormal area excluding human activity interference, specifically, interpreting plant, village and road information of the research area by using a high-resolution image, marking the plant and the village as point files on a graph, marking the road as a line file, respectively analyzing the point and the line file as buffer areas, performing superposition analysis on the buffer areas and the uranium abnormal area obtained in the second step, and identifying the uranium abnormal area superposed with the buffer areas as a non-mineralizing abnormal area.
3. The method for screening uranium element abnormality in sandstone-type uranium ore soil according to claim 2, wherein the method comprises the following steps: in the fourth step, the method for identifying the non-minerally induced abnormal area caused by the terrain comprises the steps of calculating indexes of flow direction, flow and gradient by acquiring digital model data of the ground height of a research area, establishing a ground surface water system distribution diagram on the basis of the indexes, performing buffer area analysis on a line file of a water system, performing superposition analysis on the water system buffer area and the uranium abnormal area obtained in the third step, and identifying the uranium abnormal area which is consistent with the distribution range and the extension direction of the water system buffer area as the non-minerally induced abnormal area.
4. The method for screening uranium element abnormality in sandstone-type uranium ore soil according to claim 3, wherein the method comprises the following steps: in the sixth step, the grading method is to stack the uranium abnormal area and the geological mineralization elements, and the grading standard is as follows: the uranium abnormal areas which are overlapped with the ranges of the 3 geological mineral forming elements are marked as A-type abnormalities; the uranium anomaly region which is overlapped with the geological mineral forming element range of 1-2 is marked as a B-type anomaly; the uranium anomaly region that does not coincide with the range of geological mineralizing elements is marked as a class C anomaly.
5. The method for screening uranium element abnormality in sandstone-type uranium ore soil according to claim 4, wherein the method comprises the following steps: in the sixth step, the geological mineral elements comprise a mineral-containing construction sedimentation system, a secondary hump structure and an oxidation-reduction transition zone range.
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