CN111045086A - Geophysical exploration method for sodium-assisted uranium deposit - Google Patents
Geophysical exploration method for sodium-assisted uranium deposit Download PDFInfo
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- CN111045086A CN111045086A CN201911396889.9A CN201911396889A CN111045086A CN 111045086 A CN111045086 A CN 111045086A CN 201911396889 A CN201911396889 A CN 201911396889A CN 111045086 A CN111045086 A CN 111045086A
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/081—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices the magnetic field is produced by the objects or geological structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/38—Processing data, e.g. for analysis, for interpretation, for correction
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Abstract
The invention belongs to the technical field of geological exploration, and particularly relates to a sodium-substituted uranium deposit geophysical exploration method. The invention comprises the following steps: determining electrical and magnetic physical property parameters of rocks in/in a research area; step two, constructing an ore finding geological model of a typical sodium-substitution uranium deposit through systematic comprehensive research; step three, establishing a geophysical prospecting ore-finding model according to the established typical sodium alternate type uranium deposit ore-finding geological model and combining with physical parameters of rocks; performing geophysical measurement and measurement work, and performing response analysis on a geophysical survey model; and (4) delineating beneficial sections of the uranium ore in the deep uranium ore deposit by comprehensive analysis. The invention can accelerate the ore-finding speed, greatly reduce the drilling workload, improve the ore-finding hit rate, shorten the exploration period and reduce the exploration cost.
Description
Technical Field
The invention belongs to the technical field of geological exploration, and particularly relates to a sodium-substituted uranium deposit geophysical exploration method.
Background
The sodium-substituted uranium deposit is a very important hydrothermal uranium deposit type and is widely developed in the global range. Such deposits are produced in ukraine, australia, canada, brazil, karilong, magas, usa, guiyana, czech, etc. Although the average grade of uranium of the sodium cross-substitution type uranium deposit is much lower than that of other types of uranium deposits, the content of U resources can be comparable to that of globally known non-integrated surface type uranium deposits, a large-scale uranium mineralization zone is formed, and the uranium mineralization zone has a good prospect of prospecting. The sodium alternate hydrothermal type uranium deposit in the Longhushan uranium mineralization zone is the most typical alkali alternate hydrothermal type uranium deposit in China and is a uranium deposit discovered in the early stage of uranium resource exploration in China. However, because the grade of the uranium ores in China is low, the distribution range is small, the ore control fracture change is fast, and the multi-solution and the limitation of a single geophysical prospecting method greatly increase the uncertainty of the measurement result, the beneficial section of the sodium-intergrated uranium ore is difficult to accurately determine, and the exploration result is difficult to break through so far. Meanwhile, the uranium ore exploration is shifted to a blind ore exploration stage by means of high technology. Therefore, in order to improve the adaptability and the detection capability of the physical and chemical exploration technology in the regional uranium resource exploration, the research on the sodium-assisted uranium deposit geophysical exploration method is developed, so that the aim of effectively and economically solving the geological problem is fulfilled, and a good ore finding effect is achieved.
Disclosure of Invention
The technical problems solved by the invention are as follows:
the invention provides a sodium-substituted uranium deposit geophysical exploration method which can accelerate ore finding, greatly reduce drilling workload, improve ore finding hit rate, shorten exploration period and reduce exploration cost.
The technical scheme adopted by the invention is as follows:
a geophysical exploration method for a sodium-assisted uranium deposit comprises the following steps:
determining electrical and magnetic physical property parameters of rocks in/in a research area;
step two, constructing an ore finding geological model of a typical sodium-substitution uranium deposit through systematic comprehensive research;
step three, establishing a geophysical prospecting ore-finding model according to the established typical sodium alternate type uranium deposit ore-finding geological model and combining with physical parameters of rocks;
performing geophysical measurement and measurement work, and performing response analysis on a geophysical survey model; and (4) delineating beneficial sections of the uranium ore in the deep uranium ore deposit by comprehensive analysis.
In the first step, the physical parameters of the electrical property and the magnetism of the rocks in the research area/region are determined through the work of collecting, comprehensively sorting and analyzing, carrying out rock physical parameter measurement and the like.
And in the second step, an ore finding geological model of the sodium-handed uranium deposit is constructed on the basis of comprehensive research on typical sodium-handed uranium deposit uranium ore-forming geological conditions, ore-forming geological characteristics, ore control factors and ore-forming rules.
And in the third step, a geophysical prospecting and prospecting model is established according to the typical sodium cross-generation type uranium deposit prospecting geological model established in the second step and the rock geophysical property parameters determined in the first step.
In the fourth step, the geophysical measurement work, such as electrical measurement, magnetic measurement, gravity measurement and the like, is developed in the working area; and performing relevant processing on the acquired geophysical data, performing response analysis on a geophysical exploration model, and delineating beneficial sections for finding ores of deep uranium ores of sodium-substitution type uranium ore deposits through comprehensive analysis.
The invention has the beneficial effects that:
(1) the method has the advantages of wide coverage, good timeliness, strong applicability and high accuracy. The method has an important guiding function on deep prospecting of sodium alternate uranium ores in China, and has a wide popularization and application prospect;
(2) the method can simply, quickly and effectively define the beneficial sections for the exploration of the deep uranium ore of the sodium-substitution type uranium ore deposit, and provides technical support for the exploration and the mineralization prediction of the sodium-substitution type uranium ore deposit.
Drawings
FIG. 1 is a typical sodium-substituted uranium deposit prospecting geological model;
FIG. 2 is a typical sodium-substituted uranium deposit geoelectric model;
FIG. 3 illustrates a typical sodium-substituted uranium deposit geomagnetism model.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
the invention provides a sodium-assisted uranium deposit geophysical exploration method which comprises the following steps:
determining physical parameters of electrical property, magnetism and the like of rocks in/in a research area;
the physical parameters of the rocks in the mining area, such as electrical property, magnetism and the like, are determined through the work of collecting, comprehensively sorting and analyzing, carrying out measurement and the like of the physical parameters of the rocks in a certain sodium-substituted uranium mining area in China. Rock electrical property and magnetism in a mining area have certain difference. The change range of the magnetic property of the amphibole is large; the overall magnetism of the sodium-substituted rock and the granite is changed greatly, and part of the sodium-substituted rock and the granite has relatively medium and strong magnetism characteristics and part of the sodium-substituted rock and the granite has weak magnetism characteristics; the marble is a low-resistivity electric characteristic in a broken state, and the complete marble is a high-resistivity electric characteristic; the magnetic change range of the twinkling rock body is large, and the overall magnetism is strong; the mineralized granite has weakened magnetism and shows weak magnetism.
TABLE 1 statistics of main lithology and physical properties in the working area
Secondly, constructing an ore finding geological model of the sodium-substitution uranium deposit through systematic comprehensive research;
building a typical deposit prospecting geological model is a necessary step for regional mineralization prediction. Through comprehensive research on uranium mineralization geological conditions, mineralization geological characteristics, mineral control factors, mineralization rules and the like of a certain typical sodium-substitution uranium deposit in China, the sodium-substitution uranium deposit is mainly jointly controlled by three in one by fracture, lithologic interfaces and sodium-substitution corrosion variants. NWW-direction fracture zone integrally controls the output and distribution of sodium-substitution type ore deposit and mineralization (chemical) point, and is an ore control structure; the near E-W direction fracture and the NWW direction fracture form a plurality of structure clamping areas, a single ore body is produced in the east-west direction and is strictly controlled by the east-west direction pressure-torsion structure, and the E-W direction structure is the most close to the ore forming structure and is an ore forming structure. The lithologic contact surface is a structural weak surface, and a structural crack is easy to form in late structural activities; more importantly, in general, the lithology difference on two sides of the lithology contact surface can form a high-contrast geochemical barrier with a very different geochemical background; therefore, the physical and chemical environment formed by the lithologic contact surface is beneficial to the migration, unloading, enrichment and mineralization of the sodium-assisted uranium ore. The Longshou mountain mineral-forming sodium-substitution uranium mineralization is produced in a sodium-substitution alteration body without exception; the formation and distribution of the alkali-intergrated uranium ores are controlled by sodium intergrated altered rock; the sodium interbite is a main mineral control factor and an important mineral finding mark. Thus, an ore exploration geological model of the typical sodium-substituted uranium deposit is constructed (figure 1).
Step three, establishing a geophysical prospecting ore-finding model according to the established typical sodium alternate type uranium deposit ore-finding geological model and combining with physical parameters of rocks;
and performing geophysical inversion on the geophysical data obtained in the typical sodium-substituted uranium mining area. And (3) establishing a geophysical prospecting and prospecting model according to the sodium alternate type uranium deposit prospecting geological model established in the step two and the rock geophysical property parameters determined in the step one (figure 2 and figure 3). As can be seen from the two-dimensional geoelectrical model (figure 2), the complete marble rock is a high-resistance body (1500 omega m), the amphibole and alkali-alternating rock is a medium-high resistance body (1500 omega m), and the granite surrounding rock is a medium-resistance bodyThe body (500. omega. m), the fracture zone, the altered zone, and the like are low-resistance bodies (10 to 50. omega. m). The large fracture and the secondary fracture in the model are intersected at about-400 m to form a structure intersection part; the amphiboles and the alkali interbites are distributed along the fracture. As can be seen from the two-dimensional geomagnetic model (FIG. 3), the marble, granite and the fractured zone are weak magnetisms, and the magnetic susceptibilities are respectively 10 × 10-5SI、20×10-5SI、50×10-5SI; medium magnetic amphiboles are usually distributed along the fracture with a magnetic susceptibility of 250X 10-5SI。
The beneficial section of uranium mineralization in the typical sodium-substituted uranium deposit is generally positioned in a magnetic anomaly change zone or a weaker magnetic anomaly area, and the magnetic field intensity is generally between 0nT and 100 nT; the beneficial uranium mineralization section is generally positioned in a distortion deformation section or a medium resistance low region in a medium-high resistance to low resistance gradient transition zone, and the inversion resistivity is generally less than 350 omega m.
Performing geophysical measurement and measurement work, and performing response analysis on a geophysical survey model; and (4) delineating beneficial sections of the uranium ore in the deep uranium ore deposit by comprehensive analysis.
According to the exploration requirement and the characteristics of the field geologic body, 1:5000 electrical method measurement and 1:1000 magnetic method section geophysical measurement work are carried out in a mining area. And then, carrying out relevant processing on the acquired geophysical data of the electromagnetic method, carrying out response analysis on a geophysical exploration model, and delineating beneficial sections for finding the uranium ores in the deep part of the sodium-substitution type uranium ore deposit through comprehensive analysis.
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 (7)
1. A sodium-assisted uranium deposit geophysical exploration method is characterized by comprising the following steps: the method comprises the following steps:
determining electrical and magnetic physical property parameters of rocks in/in a research area;
step two, constructing an ore finding geological model of a typical sodium-substitution uranium deposit through systematic comprehensive research;
step three, establishing a geophysical prospecting ore-finding model according to the established typical sodium alternate type uranium deposit ore-finding geological model and combining with physical parameters of rocks;
performing geophysical measurement and measurement work, and performing response analysis on a geophysical survey model; and (4) delineating beneficial sections of the uranium ore in the deep uranium ore deposit by comprehensive analysis.
2. The geophysical prospecting method for sodium-assisted uranium deposits according to claim 1, characterized in that: in the first step, the physical parameters of the electrical property and the magnetism of the rocks in the research area/region are determined through the work of collecting, comprehensively sorting and analyzing and carrying out the measurement of the physical parameters of the rocks.
3. The geophysical prospecting method for sodium-assisted uranium deposits according to claim 2, characterized in that: and in the second step, an ore finding geological model of the sodium-handed uranium deposit is constructed on the basis of comprehensive research on typical sodium-handed uranium deposit uranium ore-forming geological conditions, ore-forming geological characteristics, ore control factors and ore-forming rules.
4. The geophysical prospecting method for sodium-assisted uranium deposits according to claim 3, characterized in that: and in the third step, a geophysical prospecting and prospecting model is established according to the typical sodium cross-generation type uranium deposit prospecting geological model established in the second step and the rock geophysical property parameters determined in the first step.
5. The geophysical survey method for a sodium-substituted uranium deposit according to claim 4, wherein: in the fourth step, the geophysics measurement work is developed in the working area.
6. The geophysical survey method for a sodium-substituted uranium deposit according to claim 5, wherein: the geophysical measurement work comprises the work of electrical method measurement, magnetic method measurement and gravity measurement.
7. The geophysical survey method for a sodium-substituted uranium deposit according to claim 6, wherein: and performing relevant processing on the acquired geophysical data, performing response analysis on a geophysical exploration model, and delineating beneficial sections for finding ores of deep uranium ores of sodium-substitution type uranium ore deposits through comprehensive analysis.
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| CN108279444A (en) * | 2017-12-25 | 2018-07-13 | 核工业北京地质研究院 | A kind of mesothermal gold deposits deep detection method |
| CN110133748A (en) * | 2019-05-08 | 2019-08-16 | 核工业北京地质研究院 | A kind of method of integrated alkalic-metasomatism type uranium deposit deep metallogenetic data |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181669A (en) * | 2017-12-25 | 2018-06-19 | 核工业北京地质研究院 | A kind of hot spot active region U metallogeny recognition positioning method |
| CN108279444A (en) * | 2017-12-25 | 2018-07-13 | 核工业北京地质研究院 | A kind of mesothermal gold deposits deep detection method |
| CN110133748A (en) * | 2019-05-08 | 2019-08-16 | 核工业北京地质研究院 | A kind of method of integrated alkalic-metasomatism type uranium deposit deep metallogenetic data |
Non-Patent Citations (1)
| Title |
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| 王志宏 等: "地球物理—地质模型在龙首山地区铀矿勘查中的应用", 《物探化探计算技术》 * |
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