CN111045111A - Method suitable for recognizing comprehensive geophysical target area of ground-leaching sandstone-type uranium-bearing basin - Google Patents
Method suitable for recognizing comprehensive geophysical target area of ground-leaching sandstone-type uranium-bearing basin Download PDFInfo
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- CN111045111A CN111045111A CN201911327148.5A CN201911327148A CN111045111A CN 111045111 A CN111045111 A CN 111045111A CN 201911327148 A CN201911327148 A CN 201911327148A CN 111045111 A CN111045111 A CN 111045111A
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Abstract
The invention belongs to the field of comprehensive geophysical exploration methods, and particularly discloses an effective comprehensive geophysical method suitable for identifying a target area of an in-situ sandstone-type uranium-bearing basin, which comprises the following steps: dividing a sedimentary basin ground structure unit in a ground sandstone type uranium-bearing sedimentary basin, and determining a basin depression and a uplift area; secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections; and step three, determining the underground geoelectricity structural characteristics and determining the sand body space distribution and form favorable for the uranium ore-forming on the basis of the advantageous uranium ore-forming section preferably selected in the step two. The invention combines three geophysical methods of gravity, high-precision magnetic measurement and high-precision electromagnetic method, and has wide coverage, good applicability and high accuracy.
Description
Technical Field
The invention belongs to the field of comprehensive geophysical exploration methods, and particularly relates to a comprehensive geophysical method suitable for effectively identifying a target area of an in-situ sandstone-type uranium-bearing basin.
Background
In the field of uranium mine exploration of an in-situ sandstone type, common geophysical exploration methods mainly comprise a gravity method, a magnetic method and an electromagnetic method, and the gravity exploration method has a positive effect in solving geological problems such as earth structure unit division, basement undulation and the like; the ground high-precision magnetic method plays an important role in solving the problems of delineation of invaded rocks, division of rock mass boundaries, fracture structures and the like, and particularly has a remarkable effect in the aspect of finding uranium and polymetallic minerals in recent years; the audio frequency earth electromagnetic method and earth electromagnetic method in the electromagnetic method are a direct method for understanding the spreading and burying depth of the mineral sand body by detecting the electrical structure and characteristics of underground rock and stratum.
In actual geophysical exploration of sand-leaching uranium ores, due to the lack of system selection and analysis of different geophysical methods and corresponding parameters in different exploration stages, the matching degree of the method and geological problems needing to be solved urgently is poor. In order to exert the advantages of different geophysical methods in different exploration stages and improve the geophysical exploration efficiency of the sandstone-type uranium ores, a method system corresponding to actual geological problems needs to be established, so that the sandstone-type uranium ores are quickly, effectively and accurately detected.
Disclosure of Invention
The invention aims to provide a comprehensive geophysical target area identification method suitable for an in-situ sandstone type uranium-bearing basin, which is wide in coverage area, good in applicability and high in accuracy.
The technical scheme for realizing the purpose of the invention is as follows: a method for identifying a comprehensive geophysical target area suitable for an in-situ sandstone type uranium-bearing basin comprises the following steps:
dividing a sedimentary basin ground structure unit in a ground sandstone type uranium-bearing sedimentary basin, and determining a basin depression and a uplift area;
secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections;
and step three, determining the underground geoelectricity structural characteristics and determining the sand body space distribution and form favorable for the uranium ore-forming on the basis of the advantageous uranium ore-forming section preferably selected in the step two.
Dividing the structure units of the sedimentary basin by using gravity data in the step one
And in the second step, ground high-precision magnetic measurement is adopted, and rock mass boundaries are divided, so that favorable sections of uranium mineralization are optimized.
And in the third step, electromagnetic measurement is adopted to determine the underground geoelectrical structural characteristics.
And the electromagnetic measurement in the third step adopts an audio magnetotelluric method or a magnetotelluric method.
The gravity data scale in the step one is 1: 200000 to 1: 500000.
and the ground high-precision magnetic measurement scale in the step two is 1: 50000 to 1: 100000.
the invention has the technical effects that: according to the method, three geophysical methods of gravity, high-precision magnetic measurement and a high-precision electromagnetic method are combined, a sedimentary basin uranium mineralization region ground structure unit is divided firstly, a uranium mineralization favorable segment with a depression and uplift boundary is divided secondly, and finally, the spatial position and the form of an mineralization target layer are interpreted and identified in the optimized uranium mineralization favorable segment. The method provides a technical means for the exploration of the sandstone-immersed uranium ores in the sedimentary basin, shortens the evaluation period and reduces the investment risk of mineral exploration. The detection result of the invention is compared with the actual drilling and well logging interpretation data, the consistency is better, and the invention has important practical significance for the comprehensive prospecting work of the in-situ sandstone type uranium-bearing basin.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention provides a method for identifying a comprehensive geophysical target area of an in-situ sandstone type uranium-bearing basin, which comprises the following steps of:
step one, dividing a sedimentary basin ground structure unit in a ground sandstone-immersed uranium-bearing sedimentary basin, and determining basin depression and uplift areas
In the first step, the sedimentary basin earth structure units are divided by adopting gravity data, wherein the gravity data is preferably a medium scale, for example, the gravity data scale is 1: 200000 to 1: 500000.
secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections;
in the second step, ground high-precision magnetic measurement is adopted, and rock mass boundaries are divided so as to preferably select favorable sections of uranium mineralization; the ground high-precision magnetic measurement is carried out according to a medium and small scale, for example, the ground high-precision magnetic measurement scale is 1: 50000 to 1: 100000.
and step three, determining the underground geoelectricity structural characteristics and determining the sand body space distribution and form favorable for the uranium ore-forming on the basis of the advantageous uranium ore-forming section preferably selected in the step two.
Electromagnetic measurement is adopted in the third step to determine the underground geoelectricity structural characteristics, namely the characteristics of sand body space distribution and burial depth beneficial to uranium mineralization are determined; and (3) detecting the sand body of the ore-containing target layer to be 0-1500 m, and performing electromagnetic measurement by adopting an audio magnetotelluric method or a magnetotelluric method.
The parameters for electromagnetic measurement by the audio magnetotelluric method are as follows: the low-pass filtering selects a 0 gear, the coupling parameters of a track and a magnetic track are selected as AC coupling, the gain of the track is selected as a multiplied by 4 gear, and the sampling rate is as follows: 30-60, 50HZ for industrial frequency selection, 20-50 m for electrode distance and 50-100 m for point distance.
The parameters for electromagnetic measurements using the geoelectromagnetic method are as follows: the low-pass filtering selects a 0 gear, the coupling parameters of a circuit and a magnetic track are selected as DC coupling, the gain of the magnetic track of the circuit is selected as a multiplied by 4 gear, and the sampling rate is as follows: 60-200, 50HZ for industrial frequency selection, 50-100 m for electrode distance and 100-200 m for point distance.
Example 1:
a method for identifying a comprehensive geophysical target area suitable for an in-situ sandstone type uranium-bearing basin sequentially comprises the following steps:
step one, in a ground sandstone-type uranium-bearing sedimentary basin, dividing a sedimentary basin ground structure unit, and determining basin depressions and uplift areas
When the buried depth of the substrate of the local sandstone-immersed uranium-bearing sedimentary basin is 0-600 m, the research area range is less than 500 square kilometers, and the utilization scale is 1: 200000 to divide the units of ground structure.
Secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections;
when the buried depth of the substrate of the local sandstone-immersed uranium-bearing sedimentary basin is 0-600 m, the research area range is less than 500 square kilometers, and the development scale is 1: 50000 ground high-precision magnetic measurement is carried out to divide the boundary of the invaded rock mass so as to determine the beneficial region of the sedimentary basin uranium mineralization.
And step three, on the basis of the advantageous section of the uranium finished ore preferably selected in the step two, the underground geoelectricity structural characteristics are known, and the sand body space distribution and the form which are advantageous to the uranium finished ore are determined.
When the buried depth of the basin foundation is 0-600 meters, the research area range is less than 10 square kilometers, an audio magnetotelluric method is adopted for electromagnetic measurement, and the stratum with the buried depth of 0-600 meters is accurately divided, so that the buried depth characteristics of the sand body of the target stratum are known. Parameters for electromagnetic measurement by an audio magnetotelluric method: the low-pass filtering selects a 0 gear, the coupling parameters of the electric channel and the magnetic track are selected as AC coupling, the gain of the electric channel and the magnetic track is selected as a multiplied by 4 gear, the sampling rate is selected to be 30, the industrial frequency is selected to be 50HZ, the electrode distance is 25 meters, and the point distance is 50 meters.
Example 2:
a method for identifying a comprehensive geophysical target area suitable for an in-situ sandstone type uranium-bearing basin sequentially comprises the following steps:
step one, in a ground sandstone-type uranium-bearing sedimentary basin, dividing a sedimentary basin ground structure unit, and determining basin depressions and uplift areas
When the buried depth of the substrate of the local sandstone-immersed uranium-bearing sedimentary basin is 600-1500, the research area range is 500-1000 square kilometers, and the utilization scale is 1: 500000 area gravity data to divide into local structure units.
Secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections;
when the buried depth of the substrate of the local sandstone-immersed uranium-bearing sedimentary basin is 600-1500, the research area range is 500-1000 square kilometers, and the development scale is 1: 100000 ground high-precision magnetic measurement is carried out to divide the boundary of the invaded rock mass so as to determine the beneficial section of the sedimentary basin uranium metallogenetic ore.
Step three, on the basis of the advantageous section of the uranium finished ore preferably selected in the step two, the underground geoelectricity structural characteristics are known, and the sand body space distribution and the form which are advantageous to the uranium finished ore are determined
In the third step, when the buried depth of the substrate of the local sandstone-immersed uranium-bearing sedimentary basin is 600-1500, the range of a research area is within the range of 10-50 square kilometers, electromagnetic measurement is carried out by adopting a geoelectromagnetic method, and the stratum with the buried depth ranging from 600-1500 meters is accurately divided, so that the buried depth characteristic of the sand body of the target stratum is known. Parameters for electromagnetic measurement by the geoelectromagnetic method: the low-pass filtering selects a 0 gear, the coupling parameters of the electric channel and the magnetic track are selected to be DC coupling, the gain of the electric channel and the magnetic track is selected to be multiplied by 4, the sampling rate is selected to be 180, the industrial frequency is selected to be 50HZ, the electrode distance is 50 meters, and the point distance is 100 meters.
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 method for identifying a comprehensive geophysical target area suitable for an in-situ sandstone type uranium-bearing basin is characterized by comprising the following steps:
dividing a sedimentary basin ground structure unit in a ground sandstone type uranium-bearing sedimentary basin, and determining a basin depression and a uplift area;
secondly, dividing rock boundaries in the depression areas divided in the first step so as to preferentially select advantageous uranium mineralization sections;
and step three, determining the underground geoelectricity structural characteristics and determining the sand body space distribution and form favorable for the uranium ore-forming on the basis of the advantageous uranium ore-forming section preferably selected in the step two.
2. The method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to claim 1, wherein the method comprises the following steps: and in the first step, the sedimentary basin geostructure units are divided by utilizing gravity data.
3. The method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to claim 2, wherein the method comprises the following steps: and in the second step, ground high-precision magnetic measurement is adopted, and rock mass boundaries are divided, so that favorable sections of uranium mineralization are optimized.
4. The method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to claim 3, wherein the method comprises the following steps: and in the third step, electromagnetic measurement is adopted to determine the underground geoelectrical structural characteristics.
5. The method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to claim 4, wherein the method comprises the following steps: and the electromagnetic measurement in the third step adopts an audio magnetotelluric method or a magnetotelluric method.
6. The method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to any one of claims 2 to 5, wherein the method comprises the following steps: the gravity data scale in the step one is 1: 200000 to 1: 500000.
7. the method for identifying the comprehensive geophysical target area of the in-situ sandstone-type uranium-bearing basin according to claim 6, wherein the method comprises the following steps: and the ground high-precision magnetic measurement scale in the step two is 1: 50000 to 1: 100000.
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| CN112731557A (en) * | 2020-11-27 | 2021-04-30 | 核工业北京地质研究院 | Comprehensive geophysical method for predicting favorable area of sandstone uranium ore mineralization |
| CN113189668A (en) * | 2021-04-29 | 2021-07-30 | 东华理工大学 | Ore searching method for sandstone-type uranium ore in basin |
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| CN113189668A (en) * | 2021-04-29 | 2021-07-30 | 东华理工大学 | Ore searching method for sandstone-type uranium ore in basin |
| CN113189668B (en) * | 2021-04-29 | 2022-05-06 | 东华理工大学 | Ore searching method for sandstone-type uranium ore in basin |
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Application publication date: 20200421 |