CN115291283B - Sand body detection method in uranium mine exploration - Google Patents
Sand body detection method in uranium mine exploration Download PDFInfo
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- CN115291283B CN115291283B CN202210917501.0A CN202210917501A CN115291283B CN 115291283 B CN115291283 B CN 115291283B CN 202210917501 A CN202210917501 A CN 202210917501A CN 115291283 B CN115291283 B CN 115291283B
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- 239000004576 sand Substances 0.000 title claims abstract description 42
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 22
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- 239000000523 sample Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000011888 foil Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000010586 diagram Methods 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 5
- 230000005684 electric field Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
-
- 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
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
-
- 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
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
- G01V2003/085—Receivers
-
- 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
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
- G01V2003/086—Processing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides a sand body detection method in uranium mine exploration. On the basis of traditional electrical measurement of uranium mine exploration, the method changes a measuring device and a measuring parameter of electrical measurement, a signal receiving area is changed from an original trapezoidal receiving area to a rectangular receiving area, the measuring parameter is changed from original horizontal electric field and horizontal magnetic field measurement to vertical magnetic field measurement, a transmitting signal is changed from an original continuous harmonic signal to a bipolar step wave signal, and a receiving signal is changed from an original full-field signal (including self-field and radiation field signals) to a radiation field signal only. The invention can better and more effectively detect and identify the sand body by improving the traditional uranium ore electrical measurement.
Description
Technical Field
The invention relates to the technical field of uranium mine exploration, in particular to a sand body detection method in uranium mine exploration.
Background
Currently, the uranium deposit prospecting in China is mainly performed in-situ leaching sandstone type uranium deposit prospecting in sedimentary basins. Sand is the most important exploration element in the prospecting of in-situ leaching sandstone type uranium ores. In order to avoid the fund waste caused by blind drilling, before drilling disclosure, various geophysical sounding methods are needed to detect the elements such as distribution, burial depth, thickness and the like of sand bodies in a survey area so as to provide basis for drilling work arrangement. At present, geophysical methods for detecting sand bodies mainly comprise seismic exploration and electrical measurement, but have the following problems: firstly, the cost of adopting a seismic exploration method is high, and the use of a seismic source vehicle or explosive is not friendly to the environment; secondly, the traditional electric method measurement is more economical, but the identification capability of the sand body is insufficient.
Disclosure of Invention
The invention aims to provide a sand body detection method in uranium mine exploration, which is used for realizing more effective detection of sand bodies by changing a measurement device and measurement parameters of electrical measurement on the basis of traditional electrical measurement.
The invention is realized in the following way: a sand body detection method in uranium mine exploration comprises the following steps:
a. Collecting data to obtain a geological profile of a measurement area, the trend of a stratum and the resistivity characteristics of rock;
b. according to the geological profile of the measured area and the stratum trend, arranging a measuring line in the area of the sand body to be detected, wherein the direction of the measuring line is perpendicular to the stratum trend;
c. Collecting data;
c-1, arranging a data acquisition device: arranging 2 electrodes A, B for supplying power to the underground within the range of 500-1000 m from the measuring line, wherein the connecting line of the electrodes A, B is parallel to the measuring line; the distance between the electrodes A, B is 1-2 km; a transmitter is arranged between the electrodes A, B, and the electrodes A, B are respectively connected with the transmitter through long wires; a magnetic probe is arranged on the measuring line;
c-2, transmitting bipolar step wave signals by a transmitter, wherein the transmission fundamental frequency is 2.5Hz, and the magnetic probe receives vertical magnetic field signals after the transmission signals are powered off;
c-3, transmitting signals received by the magnetic probe to a receiver;
d. The data led out from the receiver are arranged by a computer, one-dimensional inversion, quasi-two-dimensional inversion and quasi-earthquake processing are carried out by inversion software, and finally one-dimensional resistivity, two-dimensional resistivity and quasi-earthquake sectional images are obtained;
e. And deducing the sand body in the area according to the one-dimensional resistivity, the two-dimensional resistivity and the simulated seismic section diagram by combining the rock resistivity characteristics.
Preferably, in step c-1, the specific laying steps of the electrode A, B are as follows: and (3) digging 16-20 pits with the depth of 20-30 cm on the ground, wherein the size of each pit is based on the fact that an aluminum plate or aluminum foil can be placed, pouring saline water in the pits and fully stirring the saline water and sand into mud, then fully contacting the aluminum plate or aluminum foil with the mud, and covering the pits with the sand to reduce water evaporation, wherein all the aluminum plates or aluminum foils are communicated by a wire.
Preferably, when data is collected in step c, if the electrode A, B cannot cover the entire measuring line, after the measuring of the measuring line in the signal receiving area is completed, the electrode A, B is moved along the measuring line direction, and the measuring is performed again until the measuring of the entire measuring line is completed.
Preferably, in step c-1, the effective area of the magnetic probe is 1 ten thousand square meters.
The invention combines the advantages of the frequency domain electric method and the time domain electric method in uranium exploration, improves the measuring device and the measuring parameters, improves the detection capability, and has the following advantages compared with the traditional electric method of sand body detection:
When underground power supply is adopted as a transmitting source, the traditional electric method is used for collecting frequency domain electromagnetic signals, namely, the frequency points are collected from high frequency to low frequency one by one, and the frequency points are limited. Therefore, the acquired signals are richer than the signals of the traditional frequency domain electric method, the acquired underground information is richer, and the underground resolving power can be improved, so that the method has more advantages in detecting the sand body.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a data acquisition device and a signal receiving area in a conventional electrical measurement.
Fig. 3 is a schematic diagram of a data acquisition device and signal receiving area in the present invention.
In fig. 4, a is a one-dimensional inversion result, b is a quasi-two-dimensional inversion result, c is a quasi-seismic processing result, and d is a geological interpretation section diagram; in the figure: 1-near surface earth, sand, gravel and other deposits; 2-fine-grained sedimentary rock mainly composed of mudstone, siltstone and the like; 3-identified sand bodies; 4-identified breaks; 5-drilling location and drilling depth; 6-logging resistivity curves of the well, wherein the saw tooth-like curve segments characterize sand bodies.
Detailed Description
With reference to fig. 1, the technical scheme of the invention mainly comprises the following six parts.
1. Data collection and analysis
Geological, drilling and physical data of the area are collected through a national geological data store and a nuclear industry geological archive. The geological data comprise basin construction units of the area, geological map of the area, chronostratigraphic layers, main lithology categories of each set of stratum development, folds and fracture development conditions of the area, and approximate depth and thickness of a target layer and main lithology of development are detected; drilling data including the location of the borehole, the drilling depth, the formation thickness, and lithology categories revealed from top to bottom; the physical property data refers to the resistivity of different lithologies in each stratum, and each stratum contains multiple lithologies. And analyzing the stratum, the detection target layer and the trend of fracture in the detection area according to the collected data, analyzing the resistivity characteristics of different lithologies in different strata, and summarizing the resistivity difference between the sand body in the detection target layer and the mudstone above and below the sand body.
2. Design of measuring line
After the trend of the detection target layer of the detection area is approximately known, the measuring line is arranged in the area needing to detect the sand body, the direction of the measuring line is perpendicular to the trend of the detection target layer, and the length of the measuring line covers the area needing to detect the sand body as much as possible.
3. Data acquisition
The invention is the same as the traditional electrical measurement in that the transmitting source and the receiving end realize accurate acquisition of signals through time synchronization. The difference is that: in the prior art of uranium exploration, the data receiving area of the electrical data acquisition device is within the opening angle range of 30 degrees on both sides of the perpendicular bisector of the emission source AB (see fig. 2), and the vertical distance between the signal receiving position and the emission source AB is generally greater than 4 times of skin depth, so that a trapezoidal area is formed. A 4 times skin depth, for example, if a 1km depth is required to be detected, the vertical distance of the signal receiving location from the transmitting source AB needs to be greater than 4km.
As shown in FIG. 3, the data acquisition device of the invention respectively makes vertical lines at the point A, B, and a signal receiving area is arranged in a rectangular area with the distance AB connecting lines of 500-1000 m between the two vertical lines. Compared with the traditional uranium ore electrical investigation device: ① The signal receiving area is closer to the transmitting source, and the signal is stronger; ② Compared with the rectangular area receiving method, the rectangular area receiving method has the advantages that signal distortion can be avoided by adopting the rectangular area, and further, the investigation accuracy is improved.
(II) emission source arrangement of the invention
After the test line is designed, 2 electrodes A, B for supplying power to the underground are arranged at the distance range of 500-1000 m beside the test line, so that the AB connection line is ensured to be parallel to the test line, and the distance between A, B and 1-2 km is ensured. A. The B pole is paved by a plurality of aluminum plates (aluminum foils), and the specific paving steps of each power supply electrode are as follows: and (3) digging 16-20 (without limitation) pits with the depth of 20-30 cm on the ground, wherein each pit is sized based on the fact that an aluminum plate (aluminum foil) can be placed, pouring saline water in the pit and fully stirring the saline water and sand into mud, pressing the aluminum plate (aluminum foil) on the mud, enabling the bottom of the aluminum plate (aluminum foil) to fully contact with the mud, and covering the pit with sand to reduce water evaporation. And connecting the 16-20 aluminum plates through wires. The transmitter is placed in the middle of the AB, and A, B is connected with the transmitter by long wires respectively. And a high-power generator is used for supplying power to the transmitter so as to ensure the strength of a transmitted signal. The wave form of the signal transmitted by the transmitter is bipolar jump wave, and the transmission fundamental frequency is 2.5Hz.
Unlike the emission sources of previous uranium mining electrical surveys: the signal types of the two signals are different, and when the transmission source in the AB form is adopted in the past, the transmission signal is a continuous harmonic signal and has a plurality of frequencies, and the frequency interval is an integer multiple of binary system. When the invention adopts an AB type transmitting source, the transmitting signal is a step wave signal, and the transmitting period is fixed.
(III) Signal reception of the invention
The signal receiving adopts a magnetic probe with the effective area of 1 ten thousand square meters (the effective area is obtained by multiplying the number of winding turns of a coil in the probe by the area of a single turn), the magnetic probe is vertically arranged and is naturally contacted with the ground, a probe frame is used for stabilizing so as to prevent the magnetic probe from toppling over, and a vertical magnetic field signal is received through the magnetic probe. A plurality of measuring points are arranged on one measuring line, a magnetic probe is placed at one measuring point, and after the measurement of one measuring point is completed, the magnetic probe is placed on the other measuring point, and the measurement is continued. The magnetic probe receives signals as secondary field signals formed after the power-off of the transmission, namely the transmission signals and the receiving signals are intermittent, the signals are received after the power-off of the transmission, the signals are transmitted after the signal reception is finished, the signals are received after the power-off, and the cycle is performed in a mode of transmitting-receiving-transmitting-receiving … …. On the measuring line, the range of the measuring line which can be covered by one transmitting device is the distance between the AB vertical projection and the measuring line, namely the measuring length which can be covered by one transmitting device is the distance between the AB. When one emission source cannot cover the whole measuring line, after the measurement of the previous emission source is completed, the AB pole needs to be sequentially moved along the direction of the measuring line, and the measurement of the whole measuring line is completed by adopting a plurality of emission sources.
Unlike the received signals from previous uranium mining electrical surveys: ① In the prior uranium mine electrical investigation, the emission signal is a continuous harmonic signal, so the receiving signal is a full-field signal, the full-field signal comprises two signals of a self-field signal and a radiation field, the radiation field is a signal related to a detection target and is a required signal, the self-field signal is a signal unrelated to the detection target, the self-field signal belongs to an interference signal, and the detection effect is affected to a certain extent by the existence of the self-field signal. The invention adopts intermittent transmitting and intermittent receiving methods, and the receiving signal is a secondary field signal formed after the transmitting is powered off, so the receiving signal is only a radiation field signal, does not contain a self-contained field signal, and is more beneficial to realizing the detection of a target body. ② The measurement parameters are different, the traditional electric measurement needs to collect two components of a horizontal electric field (measured by two electric sensors placed on the ground and at a certain distance) and a horizontal magnetic field (horizontally arranged by a traditional electric measurement magnetic probe), and then the resistivity is calculated according to the two components of the measured horizontal electric field and horizontal magnetic field. The measuring parameter of the invention is only a vertical magnetic field component, the resistivity is calculated according to the vertical magnetic field component, and the invention is more convenient than the prior uranium ore electric measuring method in view of convenience of construction.
4. Data arrangement
After the data acquisition is completed, the acquired data of the magnetic probe at each measuring point, the coordinates of the measuring point and the position information of a plurality of emission sources AB are integrated into a file, so that preparation is made for the next data inversion.
5. Data inversion
And loading the well-arranged survey line data file into inversion software, and carrying out one-dimensional and quasi-two-dimensional inversion on the survey line data by taking survey area drilling data as constraint conditions. As shown in fig. 4a and b, a is a one-dimensional inversion result, and b is a pseudo-two-dimensional inversion result. The deep geological conditions, especially sand bodies, can be qualitatively analyzed through the one-dimensional inversion result, and the main content of the qualitative analysis is that lithology or fracture corresponding to areas with different resistivity in the one-dimensional inversion section diagram is primarily judged according to the one-dimensional inversion result. The pseudo-two-dimensional inversion is based on one-dimensional inversion with borehole data (four boreholes are provided in fig. 4 b) added as constraints, and fig. 4b has more accurate and finer reflection of deep geological conditions and sand distribution than fig. 4 a.
The consolidated data is subjected to a quasi-seismic process to obtain a graph c in fig. 4, and the aim of the process is to more finely delineate the boundary position of the sand body.
Based on the results of fig. 4a, b and c, sand and other geological elements such as formations, etc. are comprehensively analyzed and interpreted to yield the graph d of fig. 4.
6. Data interpretation and sand identification
And according to the physical property data of the measuring area, carrying out geological deduction interpretation on the underground electrical structure reflected by the inversion result by combining the physical property data of the measuring area. Analyzing the characteristics of the known sand body disclosed by the drilling in the inversion result, and deducing the sand body in the full-line inversion result by taking the characteristics reflected by the known sand body as an explanation mark.
Claims (4)
1. The sand body detection method in uranium mine exploration is characterized by comprising the following steps:
a. Collecting data to obtain a geological profile of a measurement area, the trend of a stratum and the resistivity characteristics of rock;
b. According to the geological profile of the measured area and the stratum trend, arranging a measuring line in the area of the sand body to be detected, wherein the direction of the measuring line is perpendicular to the stratum trend;
c. Collecting data;
c-1, arranging a data acquisition device: arranging 2 electrodes A, B for supplying power to the underground within the range of 500-1000 m from the measuring line, wherein the connecting line of the electrodes A, B is parallel to the measuring line; the distance between the electrodes A, B is 1-2 km; a transmitter is arranged between the electrodes A, B, and the electrodes A, B are respectively connected with the transmitter through long wires; a magnetic probe is arranged on the measuring line;
c-2, transmitting bipolar step wave signals by a transmitter, wherein the transmission fundamental frequency is 2.5Hz, and the magnetic probe receives vertical magnetic field signals after the transmission signals are powered off;
c-3, transmitting signals received by the magnetic probe to a receiver;
d. The acquired data are arranged by a computer, one-dimensional inversion, quasi-two-dimensional inversion and quasi-seismic processing are carried out by inversion software, and finally, one-dimensional resistivity, two-dimensional resistivity and quasi-seismic cross section diagram are obtained;
e. And deducing the sand body in the area according to the one-dimensional resistivity, the two-dimensional resistivity and the simulated seismic section diagram by combining the rock resistivity characteristics.
2. The method for detecting sand in uranium mining exploration according to claim 1, wherein in step c-1, the specific laying steps of the electrode A, B are as follows: and (3) digging 16-20 pits with the depth of 20-30 cm on the ground, wherein the size of each pit is based on the fact that an aluminum plate or aluminum foil can be placed, pouring saline water in the pits and fully stirring the saline water and sand into mud, then fully contacting the aluminum plate or aluminum foil with the mud, and covering the pits with the sand to reduce water evaporation, wherein all the aluminum plates or aluminum foils are communicated by a wire.
3. The method of claim 1, wherein when the electrode A, B cannot cover the whole measuring line during the data collection in the step c, after the measuring of the measuring line in the signal receiving area is completed, the electrode A, B is moved along the measuring line direction, and the measurement is performed again until the measuring of the whole measuring line is completed.
4. A sand detection method in uranium mining exploration according to claim 1, wherein in step c-1, the effective area of the magnetic probe is 1 ten thousand square meters.
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| CN112578474A (en) * | 2020-11-20 | 2021-03-30 | 核工业二〇八大队 | Geological exploration combination method for ore exploration scenic spot of sandstone-type uranium deposit with enclosed coverage area |
| CN114609683A (en) * | 2022-03-15 | 2022-06-10 | 核工业北京地质研究院 | A method and system for determining favorable area of sandstone-type uranium ore sand body |
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| US4467642A (en) * | 1983-03-25 | 1984-08-28 | Mobil Oil Corporation | Method for identifying complex lithologies in a subsurface formation |
| AU2011336400B2 (en) * | 2010-12-02 | 2016-03-31 | Wsp Global Inc. | Mining systems and methods |
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| CN112578474A (en) * | 2020-11-20 | 2021-03-30 | 核工业二〇八大队 | Geological exploration combination method for ore exploration scenic spot of sandstone-type uranium deposit with enclosed coverage area |
| CN114609683A (en) * | 2022-03-15 | 2022-06-10 | 核工业北京地质研究院 | A method and system for determining favorable area of sandstone-type uranium ore sand body |
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