CN116165708A - Accurate positioning method for uranium-bearing ore-forming sand body with beneficial coverage area - Google Patents

Abstract

The invention belongs to the technical field of uranium deposit favorable sand body prediction, and particularly relates to an accurate positioning method of a uranium deposit favorable sand body, which comprises the following steps: step 1, collecting and analyzing data, and delineating important mine-searching basin sections and areas with larger potential; step 2, a target horizon which is favorable for prospecting is determined; step 3, supplementing and collecting drilling data of the target horizon which is determined in the drilling step 2 and is favorable for finding ores, and counting data of various ore control elements of the target horizon; step 4, drawing each ore control element drawing piece of the target horizon by utilizing Surfer software, and screening the most favorable ore forming interval of each element; and 5, sleeving and superposing various drawing pieces, and accurately positioning the uranium-bearing ore bodies. According to the invention, the most favorable ore forming intervals of the favorable ore forming elements are extracted to be sleeved and overlapped, so that the distribution characteristics of the favorable uranium ore forming sand bodies under the coverage area are accurately positioned, and favorable support is provided for subsequent ore finding work.

Description

A Precise Locating Method for Favorable Uranium Ore-forming Sandbodies in Covering Area

technical field

The invention belongs to the technical field of prediction of favorable uranium ore-forming sand bodies, and in particular relates to a precise positioning method for favorable uranium ore-forming sand bodies in coverage areas.

Background technique

Sandstone-type uranium ore is an important type of industrial uranium mineralization in my country. With the concept of energy saving, emission reduction and environmental protection, it is very important to provide economically recoverable uranium resources to meet the development of my country's military industry and nuclear power. Sandstone-type uranium mines have ushered in a comprehensive and rapid development stage due to their shallow burial depth, easy mining, safety and environmental protection. Since the 1990s, my country has made great breakthroughs in the Ordos, Erlian, Songliao, and Yili basins, and implemented the Zaohuohao, Nalinggou, Daying, Qianjiadian, Mengqigul and other basins. The extra-large uranium deposits have formed a series of prospecting methods, which have greatly enriched the reserves of sandstone-type uranium resources in my country.

In recent years, with the continuous deepening of the exploration of sandstone-type uranium deposits, it is gradually recognized that the ore-forming mechanism of sandstone-type uranium deposits is mostly of composite origin, but the location prediction technology of favorable ore-forming sand bodies is still the key technology for ore prospecting. Therefore, it is necessary to A technical method for precise positioning of favorable ore-forming sand bodies in the coverage area is designed to improve the technical problems of poor prediction accuracy in the existing positioning and prediction of ore-forming sand bodies.

Contents of the invention

An accurate positioning method for favorable uranium ore-forming sand bodies in the coverage area designed by the present invention is used to solve the technical problem of poor positioning accuracy due to multiple uranium ore-forming mechanisms and multiple causes in the existing ore-forming sand body positioning and prediction work .

Technical scheme of the present invention:

A method for precisely locating favorable uranium ore-forming sand bodies in an overlay area, comprising the following steps:

Step 1. Collect and analyze data, delineate key prospecting basins and areas with great potential;

Step 1.1. Preliminary delineation of key basin segments;

Step 1.2, on the basis of the key prospecting basin sections delineated in step 1.1, delineate key areas;

Step 2. Determine the favorable prospecting target layer;

Step 3. Supplementary collection of drilling data for drilling through the favorable ore prospecting target layer determined in step 2, and statistics of data on various ore-controlling elements of the target layer;

Step 4, use Surfer software to draw the map of each ore-controlling element in the target layer, and screen the most favorable mineralization interval of each element;

Step 5. Overlap and overlay all kinds of maps to accurately locate favorable uranium ore-forming sand bodies.

The step 1.1, preliminary delineation of key basin sections, includes: collecting graphic data such as regional geology and tectonic evolution of the research basin, clarifying elements such as basin type, sedimentary cover, basement lithology, erosion source area conditions, etc., according to the first-level Structural units delineate key prospecting basins with great potential:

The first-order structural unit of the extrusion basin type is the piedmont slope belt, and the first-order structural unit of the rift basin type is the uplift area;

It is favorable for the sedimentary cover layer to develop an interlayer oxidation zone with a thickness <1000m;

Lithological granite in the erosion source area is the first choice, followed by pyroclastic rock and acidic volcanic rock, with uranium content ≥ 5ppm.

The step 1.2 delineates the key areas on the basis of the key prospecting basins delineated in step 1.1, including: focusing on collecting and sorting out the geological, structural, and seismic data of the basins, and researching and analyzing the sedimentary system, paleoclimate evolution, and provenance of the basins — Uranium source supply conditions and other factors, divide the secondary structural units and further delineate the key areas of favorable mineralization: according to the thickness of the favorable sedimentary cap rock in step 1.1, define the range of favorable mineralization geological age vertically; integrate the existing research data in the previous period 1. Analyze the paleoclimate and sedimentary evolution characteristics of this basin section, and determine that the semi-arid-semi-humid climate conditions in the vertical direction and the river-delta system in the sedimentary system are favorable; Provenance—uranium source is sufficient, and it is advantageous to be close to the provenance area, erosion source area or structural denudation area, and then comprehensively study and judge to delineate the key areas of favorable mineralization.

Step 2. Determining favorable prospecting target layers includes:

Step 2.1, within the key areas delineated in step 1, collect borehole data, and the collected borehole data cover the seismic profiles and other data in the whole area;

Step 2.2, vertically, use the drilling data to establish multiple typical single-well histograms, combine the regional seismic profile and other data to clarify the stratum thickness, and establish a comprehensive histogram for this key area; Based on the analysis of the lithological structure within the formation, combined with the previous research results, the vertically favorable lithological combination is selected to develop a stable mud-sand-mud structure;

Step 2.3. Horizontally, draw the well-connected section, further divide the sedimentary facies belt, sand body development, interlayer oxidation zone and other elements in units of formations, and determine the braided fluvial facies, meandering river channel subfacies, and braided fluvial facies. Delta facies plain subfacies; multi-layer sand bodies are developed and the thickness of a single layer of sand bodies is 5-15m, with good continuity; the layers with large-scale development of interlayer oxidation zones are favorable target layers.

The step 3, supplementary collection of drilling data for drilling through the favorable ore prospecting target layer determined in step 2, and statistics of the data of various ore-controlling elements of the target layer;

Step 3.1, determine the boundary of key areas delineated in step 1.2, use Mapgis software to edit the geological map of key areas on the basis of previous research results, and make a table of coordinates of inflection points of the boundaries of key areas; step 3.2, based on a large number of drilling data, statistics The ore-controlling element data and drilling coordinates of the favorable ore-forming target layers determined in step 2, such as stratum thickness, floor burial depth, sand body thickness, sand-to-ground ratio, oxidized sand body thickness, and reduced sand body thickness, are statistically organized as form form;

Step 3.3. On the basis of the above steps, the boundary coordinates of the key areas are merged with the statistical data of the ore-controlling elements in step 3.2, and the boundary coordinates of the key areas are assigned a value of 0, and the ore-controlling elements are sorted into separate tables for future use.

Said step 4: using Surfer software to draw maps of each ore-controlling element in the target layer, and screening the most favorable ore-forming interval for each element;

Step 4.1, utilize Surfer software to import the data in step 3.3 into the software, and draw the contour map of each element of the target layer;

Step 4.2: Utilize the drilling data to identify the target stratum facies mark, and edit the sedimentary facies distribution map of the target stratum.

Step 4.3. Based on the existing research data in the previous period, summarize the threshold value of the favorable ore-forming elements interval of typical sandstone-type uranium deposits, and delineate the most favorable ore-forming interval of the favorable ore-forming elements;

Step 4.4. According to the criteria in step 4.2, screen the most favorable ore-forming intervals for each element, among which, the stratum thickness > 80m, the floor depth < 1000m, the sand body thickness ≥ 60m, the sand-to-ground ratio ≥ 0.5, and the reduced sand body 10-50m most Good, followed by 50-70m, and the thickness of oxidized sand body is 10-40m.

Step 5: Overlap all kinds of maps and accurately locate favorable uranium ore-forming sand bodies;

Step 5.1, use Mapgis or CorelDRAW software to nest and superimpose each element map of the most favorable metallogenic interval screened out in step 4.3 in the sedimentary facies base map;

Step 5.2: On the basis of step 5.1, according to the probability of the coincidence of each favorable element, delineate the area with an overlap of more than 80% as the most favorable ore-forming sand body, followed by the area with an overlap of 65-80%.

Beneficial effects of the present invention:

The method of the present invention integrates and counts a large amount of drilling data on the basis of depth analysis of key basin segments (regions) to compile a series of maps of favorable metallogenic elements, extracts the most favorable metallogenic intervals of each favorable metallogenic elements, and nests and superimposes them, thereby Precisely locating the distribution characteristics of favorable uranium ore-forming sand bodies under the coverage area provides favorable support for subsequent ore prospecting work.

Under the guidance of theories of sequence stratigraphy, sedimentary petrology, uranium geology, and lithologic geochemical characteristics, the present invention uses a large number of drilling data to compile a series of maps of favorable ore-forming elements. The data sources are true and reliable, and the maps have high Accuracy. In addition, according to the most favorable ore-forming element intervals divided by the existing technical data, the compiled maps were screened and superimposed to determine the distribution of favorable ore-forming sand bodies. The method of the invention has practical guiding significance for the delineation of favorable ore-forming sand bodies, has high accuracy, can directly guide the actual ore prospecting work, and solves the key technology of favorable ore-forming sand body location prediction; in addition, it can also be used to evaluate uranium deposits in a certain area Potential and estimated resource volume.

Description of drawings

Fig. 1 is a block diagram of the accurate positioning method for favorable uranium ore-forming sand bodies in the coverage area designed by the present invention;

Fig. 2 is a location map of favorable ore-forming sand bodies in the embodiment of the present invention.

Detailed ways

A method for accurately positioning favorable uranium ore-forming sand bodies in the coverage area of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

A method for precisely locating favorable uranium ore-forming sand bodies in an overlay area, comprising the following steps:

Step 1. Collect and analyze data, delineate key prospecting basins and areas with great potential;

Step 1.1. Preliminary delineation of key basin segments;

Step 1.2, on the basis of the key prospecting basin sections delineated in step 1.1, delineate key areas;

Step 2. Determine the favorable prospecting target layer;

Step 3. Supplementary collection of drilling data for drilling through the favorable ore prospecting target layer determined in step 2, and statistics of data on various ore-controlling elements of the target layer;

Step 4, use Surfer software to draw the map of each ore-controlling element in the target layer, and screen the most favorable mineralization interval of each element;

Step 5. Overlap and overlay all kinds of maps to accurately locate favorable uranium ore-forming sand bodies.

The step 1.1, preliminary delineation of key basin sections, includes: collecting graphic data such as regional geology and tectonic evolution of the research basin, clarifying elements such as basin type, sedimentary cover, basement lithology, erosion source area conditions, etc., according to the first-level Structural units delineate key prospecting basins with great potential:

The first-order structural unit of the extrusion basin type is the piedmont slope belt, and the first-order structural unit of the rift basin type is the uplift area;

It is favorable for the sedimentary cover layer to develop an interlayer oxidation zone with a thickness <1000m;

Lithological granite in the erosion source area is the first choice, followed by pyroclastic rock and acidic volcanic rock, with uranium content ≥ 5ppm.

The step 1.2 delineates the key areas on the basis of the key prospecting basins delineated in step 1.1, including: focusing on collecting and sorting out the geological, structural, and seismic data of the basins, and researching and analyzing the sedimentary system, paleoclimate evolution, and provenance of the basins — Uranium source supply conditions and other factors, divide the secondary structural units and further delineate the key areas of favorable mineralization: according to the thickness of the favorable sedimentary cap rock in step 1.1, define the range of favorable mineralization geological age vertically; integrate the existing research data in the previous period 1. Analyze the paleoclimate and sedimentary evolution characteristics of this basin section, and determine that the semi-arid-semi-humid climate conditions in the vertical direction and the river-delta system in the sedimentary system are favorable; Provenance—uranium source is sufficient, and it is advantageous to be close to the provenance area, erosion source area or structural denudation area, and then comprehensively study and judge to delineate the key areas of favorable mineralization.

Step 2. Determining favorable prospecting target layers includes:

Step 2.1, within the key areas delineated in step 1, collect borehole data, and the collected borehole data cover the seismic profiles and other data in the whole area;

Step 2.2, vertically, use the drilling data to establish multiple typical single-well histograms, combine the regional seismic profile and other data to clarify the stratum thickness, and establish a comprehensive histogram for this key area; Based on the analysis of the lithological structure within the formation, combined with the previous research results, the vertically favorable lithological combination is selected to develop a stable mud-sand-mud structure;

Step 2.3. Horizontally, draw the well-connected section, further divide the sedimentary facies belt, sand body development, interlayer oxidation zone and other elements in units of formations, and determine the braided fluvial facies, meandering river channel subfacies, and braided fluvial facies. Delta facies plain subfacies; multi-layer sand bodies are developed and the thickness of a single layer of sand bodies is 5-15m, with good continuity; the layers with large-scale development of interlayer oxidation zones are favorable target layers.

The step 3, supplementary collection of drilling data for drilling through the favorable ore prospecting target layer determined in step 2, and statistics of the data of various ore-controlling elements of the target layer;

Step 3.1, determine the boundary of key areas delineated in step 1.2, use Mapgis software to edit the geological map of key areas on the basis of previous research results, and make a table of coordinates of inflection points of the boundaries of key areas; step 3.2, based on a large number of drilling data, statistics The ore-controlling element data and drilling coordinates of the favorable ore-forming target layers determined in step 2, such as stratum thickness, floor burial depth, sand body thickness, sand-to-ground ratio, oxidized sand body thickness, and reduced sand body thickness, are statistically organized as form form;

Step 3.3. On the basis of the above steps, the boundary coordinates of the key areas are merged with the statistical data of the ore-controlling elements in step 3.2, and the boundary coordinates of the key areas are assigned a value of 0, and the ore-controlling elements are sorted into separate tables for future use.

Said step 4: using Surfer software to draw maps of each ore-controlling element in the target layer, and screening the most favorable ore-forming interval for each element;

Step 4.1, utilize Surfer software to import the data in step 3.3 into the software, and draw the contour map of each element of the target layer;

Step 4.2: Utilize the drilling data to identify the target stratum facies mark, and edit the sedimentary facies distribution map of the target stratum.

Step 4.3. Based on the existing research data in the previous period, summarize the threshold value of the favorable ore-forming elements interval of typical sandstone-type uranium deposits, and delineate the most favorable ore-forming interval of the favorable ore-forming elements;

Step 4.4. According to the criteria in step 4.2, screen the most favorable ore-forming intervals for each element, among which, the stratum thickness > 80m, the floor depth < 1000m, the sand body thickness ≥ 60m, the sand-to-ground ratio ≥ 0.5, and the reduced sand body 10-50m most Good, followed by 50-70m, and the thickness of oxidized sand body is 10-40m.

Step 5: Overlap all kinds of maps and accurately locate favorable uranium ore-forming sand bodies;

Step 5.1, use Mapgis or CorelDRAW software to nest and superimpose each element map of the most favorable metallogenic interval screened out in step 4.3 in the sedimentary facies base map;

Step 5.2: On the basis of step 5.1, according to the probability of the coincidence of each favorable element, delineate the area with an overlap of more than 80% as the most favorable ore-forming sand body, followed by the area with an overlap of 65-80%.

The embodiments of the present invention have been described in detail above, and the present invention is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (7)

1. The accurate positioning method of the uranium-bearing ore body with the beneficial coverage area is characterized by comprising the following steps of:

step 1, collecting and analyzing data, and delineating important mine-searching basin sections and areas with larger potential;

step 1.1, preliminarily encircling a major basin section;

step 1.2, on the basis of the key mine-finding basin section defined in the step 1.1, defining key areas;

step 2, determining a target horizon favorable for prospecting;

step 3, supplementing and collecting drilling data of the target horizon which is determined in the drilling step 2 and is favorable for finding ores, and counting data of various ore control elements of the target horizon;

step 4, drawing each ore control element drawing piece of the target horizon by utilizing Surfer software, and screening the most favorable ore forming interval of each element;

and 5, sleeving and superposing various drawing pieces, and accurately positioning the beneficial uranium ore forming sand body.

2. The method for precisely positioning the uranium-bearing ore body with favorable coverage according to claim 1, wherein: step 1.1, preliminary circle focus basin section includes: collecting image-text data such as regional geology, geostructural evolution and the like of a research basin, defining factors such as basin type, sedimentary coating, basement lithology, etching source region conditions and the like, and defining a key mining basin section with larger potential according to a primary construction unit:

the extrusion basin type primary construction unit takes a mountain front slope belt and a split basin type primary construction unit as a first choice, and takes a bulge area as a first choice;

the deposited cap layer is advantageous in developing an interlayer oxide tape and has a thickness of < 1000 m;

the lithology granite in the source erosion area is the first choice, the volcaniclastic rock and the acidic volcanic rock are the second choice, and the uranium content is more than or equal to 5ppm.

3. The method for precisely positioning the uranium-bearing ore body with favorable coverage according to claim 2, wherein: step 1.2 is based on the key mining basin section outlined in step 1.1, and the key region is outlined, and comprises the following steps: the geological, structural and seismic data of the basin segment are collected and arranged in an emphasized mode, elements such as a basin segment deposition system, ancient climate evolution, object source-uranium source supply conditions and the like are researched and analyzed, secondary structural units are divided, and a key area favorable for ore formation is further defined according to the secondary structural units: defining a favorable mineralisation geologic time range in a vertical direction according to the favorable deposit cap layer thickness in step 1.1; integrating the prior research data in the earlier stage, analyzing the ancient climate and deposition evolution characteristics of the basin section, and determining that a semiarid-semiarid wet climatic condition is adopted in the vertical direction, and a deposition system is adopted as an advantage; the two-stage construction unit is used as a unit to transversely ensure that the supply of the material source and the uranium source is sufficient, and the material source area, the etching source area or the structural ablation area is close to the material source area, the etching source area or the structural ablation area, so that the important area for ore formation is comprehensively researched and judged.

4. A method of precisely locating a uranium ore body having a beneficial footprint as claimed in claim 3, wherein: step 2, determining a favorable prospecting target horizon comprises the following steps:

step 2.1, collecting drilling data in the range of the key areas defined in the step 1, wherein the collected drilling data cover the data such as the seismic profile of the whole area;

2.2, in the vertical direction, utilizing drilling data to establish a plurality of typical single-well histograms, combining the data such as seismic profile and the like on the area to determine the stratum thickness, and establishing a comprehensive histogram of the key area; on the basis, the lithology structures between various layers and in the layer group are analyzed, and the stratum mainly with a mud-sand-mud structure with stable development is selected by combining the prior research results and preferring the lithology combination in the vertical direction;

step 2.3, drawing a well connecting section transversely, further dividing elements such as a sedimentary facies zone, sand development, an interlayer oxidation zone and the like by taking a layer group as a unit, and determining plains and subphases of a plains of a triangular river channel with a plait river phase and a curved river subphase; the thickness of the multilayer sand body is 5-15m, and the continuity is good; the layer with large interlayer oxidation zone development scale is an advantageous target layer.

5. The method for precisely positioning the uranium ore body covered with favorable uranium according to claim 4, wherein: step 3, supplementing and collecting drilling data of the target horizon which is determined in the drilling step 2 and is favorable for finding ores, and counting data of various ore control elements of the target horizon;

step 3.1, determining the boundary of the key region outlined in the step 1.2, editing a geological map of the key region by using Mapgis software on the basis of the research result of the former, and manufacturing a coordinate table of inflection points of the boundary of the key region;

step 3.2, counting the formation thickness, the bottom plate burial depth, the sand thickness, the sand-to-ground ratio, the oxide sand thickness, the reduction sand thickness and other ore control element data of the favorable ore formation target layer and the drilling coordinates thereof which are obtained in the step 2 according to a large amount of drilling data, and counting and sorting the ore control element data into a table form;

and 3.3, on the basis of the step, merging the boundary coordinates of the key areas with the statistical data of the mineral control elements in the step 3.2 respectively, assigning the boundary coordinates of the key areas to 0, and arranging the boundary coordinates into independent tables for standby according to the mineral control elements.

6. The method for precisely positioning the uranium ore body covered with favorable uranium according to claim 5, wherein: the step 4: drawing each ore control element drawing piece of the target horizon by utilizing Surfer software, and screening the most favorable ore forming interval of each element;

step 4.1, importing the data in the step 3.3 into software by utilizing Surfer software, and drawing a contour map of each element of the target horizon;

and 4.2, identifying the target layer phase mark by using drilling data, and modifying the deposition phase layout of the target layer.

Step 4.3, summarizing the threshold value of the favorable ore-forming element interval of the typical sandstone-type uranium deposit according to the prior research data in the earlier stage, and defining the most favorable ore-forming interval of the favorable ore-forming element;

and 4.4, screening the most favorable ore forming interval of each element according to the standard in the step 4.2, wherein the stratum thickness is more than 80m, the bottom plate burial depth is less than 1000m, the sand thickness is more than or equal to 60m, the sand-to-ground ratio is more than or equal to 0.5, the optimal reduction sand body is 10-50m, and the optimal reduction sand body is 50-70m, and the thickness of the oxidized sand body is 10-40m.

7. The method for precisely positioning the uranium ore body covered with favorable uranium according to claim 5, wherein: step 5: the various drawing pieces are sleeved and overlapped, and the uranium-bearing ore sand bodies are positioned accurately;

step 5.1, performing nesting and stacking on the element graphs of the most favorable ore formation region screened in the step 4.3 in a sedimentary phase base graph by using Mapgis or CorelDRAW software;

and 5.2, on the basis of the step 5.1, defining an area which is overlapped by more than 80% as the most favorable ore-forming sand body according to the overlapping probability of the beneficial elements, and overlapping the area by 65-80%.

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