CN110727034A - Sandstone-type uranium ore mapping method - Google Patents
Sandstone-type uranium ore mapping method Download PDFInfo
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Abstract
The invention belongs to the technical field of ore exploration of sandstone-type uranium ores, and particularly relates to a sandstone-type uranium ore mapping prediction method. The sandstone-type uranium ore mapping technology provided by the invention integrates uranium ore formation system factors such as uranium sources, structures, sequence strata, ancient hydrodynamic force, a deposition system, sand bodies, after-generation alteration and oxidation zone characteristics, uranium mineralization characteristics and the like, summarizes ore formation rules and ore finding directions, carries out comprehensive mapping analysis, carries out ore finding prospect prediction, is suitable for prediction work at the initial stage of ore finding, and can achieve the purpose of rapidly determining favorable prospect areas of ore finding.
Description
Technical Field
The invention belongs to the technical field of ore exploration of sandstone-type uranium ores, and particularly relates to a mapping method of sandstone-type uranium ores.
Background
With the increasing application of sandstone-type uranium mine technology, various field working methods are more and more comprehensive, and data obtained through various methods are more and more, however, the data are usually displayed separately by using geological, geophysical prospecting, hydrology and other professional drawings, the represented information is single, and the mutual relation is not large. Therefore, how to select the relevant drawings, integrate the data, extract the favorable information, and perform the overlay analysis, so that the favorable information is displayed more clearly is an important technical problem to be solved at present. Therefore, it is necessary to extract the beneficial information of finding mine and to make comprehensive mapping to predict the prospect of finding mine. Therefore, a sandstone-type uranium ore mapping prediction method is needed.
Disclosure of Invention
The invention aims to provide a sandstone-type uranium ore mapping prediction method.
The technical scheme of the invention is as follows:
a sandstone-type uranium ore mapping method sequentially comprises the following steps:
step 1, performing data collection work, and collecting the existing geological information data of the current working area;
step 2, grid structure analysis
According to the geological information relevant data collected in the step 1, searching areas with obvious mineralization characteristics, and carrying out sampling experiments in the areas to obtain mineralization characteristic parameters of the areas; obtaining structural evolution characteristics of a working area according to mineralization characteristic parameters of different areas, judging uranium mineralization structure backgrounds and ore control structures under different structural conditions, and drawing a grid structure diagram; dividing the construction units and determining a target layer for finding ores according to uranium mineralization construction backgrounds and ore control constructions under different construction conditions, carrying out fracture construction identification on each construction unit, and analyzing uranium sources;
step 3, dividing target layer and comparing and analyzing target layer stratum
Determining a target layer according to the mineralization characteristic parameters obtained in the step 2, and identifying a key interface and a marker layer, so as to realize uniform division of the target layer and draw a target layer thickness map; meanwhile, a stratum contrast profile is drawn through stratum contrast work of the drilled hole, a target layer isochronous stratum framework is established, and a main exposure denudation period and a main mineralization period in the sandstone-type uranium ore development process are judged;
step 4, analyzing enrichment rule of uranium ore in target layer
Drawing a target layer sand dispersion system diagram and a target layer deposition system diagram through the lithological information statistics and deposition system analysis of the system to obtain a uranium ore enrichment rule and a spatial distribution rule of a target layer;
step 5, analyzing the ancient oxidation zone of the target layer
Classifying and identifying the paleoxidation zone of the drill hole of the target layer, drawing a paleoxidation type profile map of the target layer and analyzing the profile, analyzing the occurrence and type of the oxidation zone and judging whether the paleoxidation zone is interlayer oxidation or diving oxidation; counting the oxidation thickness and percentage of the ancient oxidation zone, drawing a rock geochemical map, and predicting the position of an interzone oxidation zone front line and the spatial distribution of an oxidation zone, a transition zone and a reduction zone;
step 6, uranium ore formation comprehensive analysis
Analyzing the spatial configuration relationship of the uranium ores according to the uranium sources determined in the source step 2, the spatial distribution rule determined in the step 4 and the ancient oxidation zone conditions determined in the step 5; judging uranium ore formation types and uranium ore formation factors according to differences of uranium ore formations by combining the grid structure diagram in the step 2 and the uranium ore enrichment rule determined in the step 4, obtaining cause relations among different types of uranium ore formations, and obtaining a uranium ore formation mode and a uranium ore formation comprehensive system analysis result;
and 7, drawing a uranium mineralization comprehensive prediction map and predicting an exploration prospect according to the structural grid map obtained in the step 2, the target layer thickness map obtained in the step 3, the stratigraphic comparison section map obtained in the step 3, the target layer sand body dispersion system map and the target layer deposition system map obtained in the step 4, the target layer paleoxidation type section map drawn in the step 5 and the target layer rock geochemistry map.
The geological information data in the step 1 comprise drilling holes, geological maps, mineralization characteristic parameters and uranium mineralization related information data.
The mineralization characteristic parameters comprise uranium mineralization information of the working area obtained through methods of earthquake, gravity, magnetic method, electric method, gamma ray radioactivity, geochemical exploration, remote sensing, sample analysis test and measurement.
In the step 4, the deposition system analysis is performed by the following method: and (3) representing the shape and scale of the sand body of the framework of the target layer by drawing a planar deposition system and drawing a deposition section, revealing the correlation between the deposition system and uranium mineralization and obtaining the enrichment rule of the uranium ore under the control of deposition.
The invention has the following remarkable effects: the sandstone-type uranium ore mapping technology provided by the invention integrates uranium mineralization system factors such as uranium sources, structures, sequence strata, ancient hydrodynamic force, a deposition system, sand bodies, after-generation alteration, oxidation zone characteristics, uranium mineralization characteristics and the like, summarizes the mineralization law and the mineralization direction, carries out comprehensive mapping analysis, carries out prospecting prospect prediction, is suitable for prediction work at the early stage of prospecting, and can achieve the purpose of rapidly determining a favorable prospect.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will be explained in more detail below by taking the ascertained nu and tyn ultra-large, Bayan wula large and Hada large uranium deposit in the twin basin as an example, in conjunction with the accompanying drawings and specific embodiments.
The embodiment provides a sandstone-type uranium ore mapping method, the flow of which is shown in fig. 1, and the method sequentially comprises the following steps:
step 1, collecting data, namely collecting the existing drilling holes, documents, geological maps with a scale of 1:25 ten thousand or other scales, earthquake, gravity, magnetic methods, electric methods, radioactivity, chemical exploration, remote sensing, analysis and test and uranium mineralization information data of the current working area.
For example, the nunchang basin has been found to be a very large, Bayan-Wula-large, Hadao-large uranium deposit. Firstly, the existing rock core, a large amount of earthquake and electrical data, drawings and the like are fully utilized, and the special ancient river valley structure of the two-connected basin is synthesized to initially obtain relevant favorable information.
Step 2, searching an area with obvious mineralization characteristics according to the relevant information data collected in the step 1; performing experiments in the areas by adopting methods such as earthquake, gravity, magnetic method, electrical method, gamma ray radioactivity, geochemical exploration, remote sensing, analysis test and measurement of uranium, thorium and potassium elements of the samples, and the like to obtain mineralization characteristic parameters of the areas; and summarizing the structural evolution characteristics of the working area, judging the uranium mineralization structure background and the ore control structure under different structural conditions, and carrying out structural grid research. According to uranium mineralization structure backgrounds and ore control structures under different structure conditions, structure units are divided, a target layer for finding ores is determined, fracture identification is carried out on each unit, and uranium sources are analyzed.
According to the geological structure characteristics of the two-pot field, mineralization is mostly assigned to the Sihan group. The distribution of uranium and thorium elements and Th/U in the basal strata and rock masses of each stage reflect that acidic invaded rocks in the west stage of Huali-Yanshan period and acidic volcanic rocks in the upper Jurassic system are main uranium source bodies (layers), and metamorphic rocks in the ancient world and acidic volcanic rocks in the upper ancient world are secondary uranium source layers in the region. It has now been found that the defensive rock mass plays an important role in the nurou and tyndallian deposits and dalsu deposits, and the Bayangla and Saohou northwest rock mass is the major source of uranium mineralizing material for deposit formation. Wherein, unconformity and later structure inversion (inversion fracture) after the deposition of the Sihan group and deposition interruption between the Sihan group and the ancient system have control effect on the development of uranium mineralization of the Sihan group and the lower stratum.
And 3, determining a target layer according to the mineralization characteristic parameters of the target layer by taking the theory of sequence stratigraphy as guidance, and identifying a key interface and a marker layer, thereby realizing the uniform division of the target layer and drawing a target layer thickness map. The above-mentioned key interfaces are art-specific terms and refer to regions of significant variation in mineralization characteristics. Meanwhile, a stratum contrast profile is drawn through stratum contrast work of all-region drilling, a stratum contrast profile is established, a target layer isochronous stratum framework is established, and a main exposure denudation period and a main mineralization period in the sandstone-type uranium ore development process are judged.
The method is characterized in that the relevant knowledge of sequence stratigraphy and biological stratigraphy is used for identifying key interfaces such as an area unconformity interface, a sequence interface between the upper section of the Sehan group and the lower section of the Sehan group, a lake flooding surface and a dense section, a hierarchical mark of a system is established, system domain division is carried out, and a uniform layer division mark is established. And identifying three first-level mark layers and six second-level mark layers for the main target layer Gaohan group and the upper and lower layers. The mapping, selecting and researching work is established on the basis of the identification of the mark layer and the comparison and division work of the whole basin stratum sequence.
And 4, summarizing the spatial distribution rule of the key uranium reservoir through the lithological information statistics and the sedimentation system analysis of the system. The method is mainly used for representing the morphology and scale of the sand body of the potential uranium reservoir framework, revealing the correlation between a deposition system and uranium mineralization and summarizing the uranium ore enrichment rule under the control of deposition through the planar deposition system drawing and the deposition profile drawing research.
By analyzing the core facies, the logging facies and the seismic facies of the typical drill hole of the Bilink basin Saohan group and combining the information of the rock structure, the structure and the like analyzed by the analysis test slice, the formation facies information is extracted, the typical sedimentation system is identified, and the cause of the main ore-forming sand body is distinguished. And (3) drawing a contour map of the thickness and sand content of the sand body by counting the information of the sand dispersion system, recovering the deposition system by analyzing the distribution information of the skeleton sand body and the source system, and drawing a deposition system map.
And 5, classifying and identifying the ancient oxidation zone of the drill hole according to a mapping unit, drawing a section diagram and analyzing the section, analyzing the occurrence and type of the oxidation zone, and judging whether the oxidation zone is interlayer oxidation or submerged oxidation. And (4) counting the oxidation thickness and percentage of the paleoxidation zone, drawing a rock geochemistry diagram, and accurately predicting the position of the oxidation zone front line and the spatial distribution of the oxidation zone, the transition zone and the reduction zone.
The Chapter system in the bilobal region is the main target layer of prospecting in the region, and the sand body of the Chapter system has thicker granularity and better rock permeability due to the sediment of the center of the ancient river valley. Finer grained sediment in the valley may be degraded by the presence of the degradation due to the direct exposure of the earth to late chalkiness. Thus, there are three directions of submerged-interlaminar oxidation zones in the ancient valley of the seohan group.
The first type is an oxidation zone. The river sandstone is rich in organic matters, pyrite and other reducing media, and oxidation-reduction transition parts are formed on two sides of the river. More typical are the uranium deposits of Hadada and the George.
The second type is the submerged-interlaminar oxidation zone. The finer sediment of riverway side granularity can be denudated for the uranium-bearing can get into ancient river valley sand body, inside ancient river valley, the direction in oxidation zone receives oxidation strength's control, probably lies in ancient river valley sand body and spreads. Typically Bayanglau ore belt.
The third type is based on latent oxidation. Uranium mineralization is controlled by the submergence surface. More typically a uranium-peronospora deposit in sehman.
Step 6, analyzing the spatial configuration relationship of the uranium ores according to the uranium sources determined in the step 2, the spatial distribution rule determined in the step 4 and the ancient oxidation zone conditions determined in the step 5; from the perspective of source-transportation-aggregation, by combining the grid structure diagram in the step 2 and the uranium ore enrichment rule determined in the step 4, the difference of uranium ore formations is deeply analyzed, the uranium ore formation type is judged, the uranium ore formation action mechanism is disclosed, the causal connection among different types of uranium ore formations is clarified, the ore formation mode is summarized, and the uranium system analysis is carried out.
The main uranium mineralization type at the upper section of the sihan group is an ancient valley type, and a diving-interlayer oxidation zone is mainly developed. The main ore control factors of the gulf valley sandstone type uranium ore are a uranium source, a uranium-containing oxygen-containing fluid and an oxidation zone, a sandstone carrying layer and a storage space, a reducing agent and a reducing action, a barrier layer and a protection action and the like. It has the following characteristics and laws: 1. the ancient river valley trend develops parallel to the pelvic edge fracture. 2. The source system is mainly supplied by a plurality of lateral sources. 3. The uranium reservoir is mainly a strip-shaped composite sand body which is formed by combining a plurality of lateral braided river delta or sandstones of a braided river sedimentation system and runs along the ancient valley. 4. The uranium mineralization is mainly the submerged interbed oxidation. 5. The target layer is rich in reducing agents, contains a certain amount of organic matters, pyrite and other substances, and provides a favorable reduction barrier for uranium enrichment.
Uranium mineralization in the lower strata of the seohan group is mainly controlled by the conditions of structure, sedimentation system, sand body, geochemical zonation of rock, reducing medium, uranium source, ancient climate and hydrogeology. It has the following characteristics and laws: 1. multiple sandstone and mudstone interbeddes are uniformly developed in the stratum, and the stratum has a relatively stable mud-sand-mud structure. 2. The uranium mineralization is mainly of a diving-interlayer oxidation type, is mainly concentrated in depression marginal areas, and has similar characteristics in diving-interlayer oxidation type uranium mineralization in different areas. Uranium mineralization is typically produced below the interface of the grey sand or oxide zone of the front end. 3. The formation is reformed due to formation inversion, and the oxidation zone is controlled by the formation inversion.
And 7, compiling a prediction result graph and predicting a distant scene according to the structural grid diagram obtained in the step 2, the target layer thickness diagram obtained in the step 3, the stratigraphic comparison section diagram obtained in the step 3, the target layer sand body dispersion system diagram and the target layer deposition system diagram obtained in the step 4, the target layer paleoxidation type section diagram and the target layer rock geochemistry diagram drawn in the step 5 and the uranium mineralization comprehensive analysis result obtained in the step 6. Integrating the information recorded in the graphs, combining the judgment of the uranium mineralization type and the analysis of the uranium mineralization mode, collecting the mineralization characteristics recorded in each graph, carrying out comprehensive judgment, and marking the areas with potential exploration values, thereby obtaining a uranium mineralization comprehensive prediction graph and a prospecting prospect.
The invention discloses a method for searching uranium ore in a two-link basin, which adopts the idea of combining sequence stratigraphy, sedimentation system analysis and basin structure analysis with the traditional uranium ore hydration theory. The main drawing composed comprises: the method comprises the following steps of constructing a grid map, a target layer thickness map, a stratigraphic comparison section map, a target layer sand dispersion system map, a target layer deposition system map, a target layer rock geochemical map, a uranium mineralization comprehensive prediction map, a comprehensive geological section map and the like.
By summarizing the type and direction of finding the mine, the work is divided into 32 distant scenic spots. The main type is ancient river valley type, besides Bayangla, Saohoubii and Qihari grid map areas, a great deal of ancient river valley type uranium ore-forming target areas and distant scenic areas are found on Basaiqio ore-forming zones and other areas. In other regions, the developed delta areas in the upper and lower seohan groups were also found to be heavily mineralized by uranium, and the small pits in the upheaval areas were also the main prospecting areas for the intercostal oxidation type and the valley type of deltas.
According to the sandstone-type uranium ore mapping method, uranium ore formation system factors such as uranium sources, structures, sequence strata, ancient hydraulic power, a deposition system, sand bodies, after-generation alteration, oxidation zone characteristics and uranium ore formation characteristics are integrated, comprehensive mapping analysis is conducted, the purpose of rapidly determining favorable prospect areas of ore formation is achieved, and the method is particularly suitable for initial ore finding work.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (5)
1. A sandstone-type uranium ore mapping method is characterized by sequentially comprising the following steps:
step 1, performing data collection work, and collecting the existing geological information data of the current working area;
step 2, grid structure analysis
According to the geological information relevant data collected in the step 1, searching areas with obvious mineralization characteristics, and carrying out sampling experiments in the areas to obtain mineralization characteristic parameters of the areas; obtaining structural evolution characteristics of a working area according to mineralization characteristic parameters of different areas, judging uranium mineralization structure backgrounds and ore control structures under different structural conditions, and drawing a grid structure diagram; dividing the construction units and determining a target layer for finding ores according to uranium mineralization construction backgrounds and ore control constructions under different construction conditions, carrying out fracture construction identification on each construction unit, and analyzing uranium sources;
step 3, dividing target layer and comparing and analyzing target layer stratum
Determining a target layer according to the mineralization characteristic parameters obtained in the step 2, and identifying a key interface and a marker layer, so as to realize uniform division of the target layer and draw a target layer thickness map; meanwhile, a stratum contrast profile is drawn through stratum contrast work of the drilled hole, a target layer isochronous stratum framework is established, and a main exposure denudation period and a main mineralization period in the sandstone-type uranium ore development process are judged;
step 4, analyzing enrichment rule of uranium ore in target layer
Drawing a target layer sand dispersion system diagram and a target layer deposition system diagram through the lithological information statistics and deposition system analysis of the system to obtain a uranium ore enrichment rule and a spatial distribution rule of a target layer;
step 5, analyzing the ancient oxidation zone of the target layer
Classifying and identifying the paleoxidation zone of the drill hole of the target layer, drawing a paleoxidation type profile map of the target layer and analyzing the profile, analyzing the occurrence and type of the oxidation zone and judging whether the paleoxidation zone is interlayer oxidation or diving oxidation; counting the oxidation thickness and percentage of the ancient oxidation zone, drawing a rock geochemical map, and predicting the position of an interzone oxidation zone front line and the spatial distribution of an oxidation zone, a transition zone and a reduction zone;
and 6, drawing a uranium mineralization comprehensive prediction map and predicting an exploration prospect according to the structural grid map obtained in the step 2, the target layer thickness map obtained in the step 3, the stratigraphic comparison section map obtained in the step 3, the target layer sand body dispersion system map and the target layer deposition system map obtained in the step 4, the target layer paleoxidation type section map and the target layer rock geochemistry map drawn in the step 5.
2. The method for mapping a sandstone-type uranium ore according to claim 1, wherein: after the layer fault oxidation zone analysis of the step 5, uranium mineralization comprehensive analysis is also included as a step 6,
analyzing the spatial configuration relationship of the uranium ores according to the uranium sources determined in the source step 2, the spatial distribution rule determined in the step 4 and the ancient oxidation zone conditions determined in the step 5; and (3) judging uranium ore formation types and uranium ore formation factors according to the difference of uranium ore formations by combining the grid structure diagram in the step 2 and the uranium ore enrichment rule determined in the step 4, obtaining cause relations among different types of uranium ore formations, and obtaining a uranium ore formation mode and a uranium ore formation comprehensive system analysis result.
3. The method for mapping a sandstone-type uranium ore according to claim 2, wherein: the geological information data in the step 1 comprise drilling holes, geological maps, mineralization characteristic parameters and uranium mineralization related information data.
4. The method for mapping a sandstone-type uranium ore according to claim 3, wherein: the mineralization characteristic parameters comprise uranium mineralization information of the working area obtained through methods of earthquake, gravity, magnetic method, electric method, gamma ray radioactivity, geochemical exploration, remote sensing, sample analysis test and measurement.
5. The method for mapping a sandstone-type uranium ore according to claim 2, wherein: in the step 4, the deposition system analysis is performed by the following method: and (3) representing the shape and scale of the sand body of the framework of the target layer by drawing a planar deposition system and drawing a deposition section, revealing the correlation between the deposition system and uranium mineralization and obtaining the enrichment rule of the uranium ore under the control of deposition.
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| CN113917563A (en) * | 2021-10-22 | 2022-01-11 | 核工业北京地质研究院 | Stratum partition and sandstone type uranium ore mineralization prediction method for uranium ore target layer |
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| CN112580119A (en) * | 2020-11-20 | 2021-03-30 | 核工业二〇八大队 | Method for compiling geological map of in-situ leaching sandstone type uranium ore series |
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| WO2023004530A1 (en) * | 2021-07-26 | 2023-02-02 | 核工业北京地质研究院 | Method for locating sandstone-type uranium deposits in red variegated layer in a sedimentary basin |
| CN113917563A (en) * | 2021-10-22 | 2022-01-11 | 核工业北京地质研究院 | Stratum partition and sandstone type uranium ore mineralization prediction method for uranium ore target layer |
| CN114185105A (en) * | 2021-11-15 | 2022-03-15 | 核工业二〇八大队 | Method for delineating favorable area of sandstone-type uranium mineralization |
| CN117371619A (en) * | 2023-12-05 | 2024-01-09 | 核工业北京地质研究院 | Method for predicting ore-forming perspective of sandstone uranium resources in exploration area |
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