CN103901482A - Method of quickly acquiring continuous underground medium electric change information - Google Patents
Method of quickly acquiring continuous underground medium electric change information Download PDFInfo
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- CN103901482A CN103901482A CN201210576169.2A CN201210576169A CN103901482A CN 103901482 A CN103901482 A CN 103901482A CN 201210576169 A CN201210576169 A CN 201210576169A CN 103901482 A CN103901482 A CN 103901482A
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Abstract
The invention belongs to the technical field of applied geophysics of the field of geological mineral exploration, and particularly relates to a method of quickly acquiring continuous underground medium electric change information. The method comprises the following steps of firstly surveying and mapping a surveyed area and controlling horizontal and vertical accuracy of topographic surveying and mapping data to be within meter-grade range, laying a geophysical survey network in the surveyed area, carrying out audio magnetotelluric survey on each section of the laid geophysical survey network, carrying out high-density resistivity survey on each section of the laid geophysical survey network, inversing data acquired by the above two survey methods, and integrating the acquired inversion geoelectric model to draw a geoelectric model with continuous medium change, wherein the main survey lines inside the survey network and the main tectonic direction of the work area are vertical or intersected at a large angle and extension of two ends of the survey line exceeds more than 20% of the length of the surveyed area.
Description
Technical field
The invention belongs to the applied geophysics technical field of geological and mineral Exploration Domain, be specifically related to the method for the electrically continuous change information of a kind of quick obtaining underground medium.
Background technology
Applied geophysics is take physics principle as technical foundation, solves the problem relevant with the earth, its objective is the understanding earth.Geological and mineral exploration is that to find mineral wealth be object activity in production.
Along with the development of economic construction, many underground engineerings are carried out in succession.Some engineering is positioned at the area of complicated topographical conditions, and special landform altitude changes violent, and the helpless or effect of general geophysical techniques means and efficiency are not good.In addition, underground engineering is also relatively dark.In order to grasp the underground geologic hidden peril that whether exists, particularly understand from earth's surface to the continuous situation of change of underground medium within the scope of underground hundreds of meters, make observation data there is no to contain the geologic body of underground hundreds of meters of scopes, be significant to underground works " dead angle ".
Therefore, the method of needing the electrically continuous change information of a kind of quick obtaining underground medium badly, merges advanced audio-frequency magnetotelluric magnetic technology (AMT), to increase work efficiency, obtain the geological information of underground thousands of meters, thereby realize the object of delineation Polymetallic Mineralization fast.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of electrically continuously method of change information of quick obtaining underground medium is provided, realize convenient, rapidly underground works is carried out to geophysics prospecting.
In order to realize this purpose, the technical scheme that the present invention takes is:
A method for the electrically continuous change information of quick obtaining underground medium, comprises the following steps:
(1) first survey and draw reconnoitring area, the level of control topographic mapping data and vertical precision are within the scope of meter level;
(2) prospecting district is laid to geophysics survey grid, or the intersect with large-angle vertical with the outstanding tectonic direction of workspace of the main survey line in survey grid; The two ends extension of survey line exceedes prospecting the more than 20% of section length;
(3) every section of laid geophysics survey grid is carried out to audio magnetotelluric method observation;
(4) every section of laid geophysics survey grid is carried out to high-density electric observation;
(5) the above-mentioned two kinds of observation procedure institute image data of inverting, inversion result will guarantee that the ground electric model that two kinds of observation procedures obtain is consistent, otherwise does inverting after revising observation data or refutation process again, consistent to the inversion result of two kinds of methods till;
(6) the inverting ground electric model comprehensively having obtained, draws underground medium continually varying ground electric model.
Further, the method for the electrically continuous change information of a kind of quick obtaining underground medium as above, wherein: between step (5) and step (6), carry out ground high precision magnetic method observation.
Further, the method of the electrically continuous change information of a kind of quick obtaining underground medium as above, wherein: in step (2), the main survey line in survey grid and the outstanding tectonic direction intersect with large-angle of workspace refer to crossing angle between 75 ° ~ 90 °.
Further, the method of the electrically continuous change information of a kind of quick obtaining underground medium as above, wherein: in step (3), when being carried out to audio magnetotelluric method observation, every section of laid geophysics survey grid controls following parameter area: measurement point distance is between 25m to 50m, spread of electrodes is 50m, adopts tensor to lay measuring station mode; The minimum effective frequency of observation data is not more than 10Hz, and the highest effective frequency is not less than 8000Hz; Every measurement point time series data recording is not less than 25 minutes; Calculate the impedance information of each measuring point by Robust method, impedance data has 10 frequencies at least and is uniformly distributed in the order of magnitude of each frequency.
Further, the method of the electrically continuous change information of a kind of quick obtaining underground medium as above, wherein: in step (4), when being carried out to high-density electric observation, every section of laid geophysics survey grid controls following parameter area: effectively Observational depth >=120m, and effectively the length of observation covers whole piece section; Spread of electrodes length≤5 meter; Many 2 times of stack observation frequency.
Technical solution of the present invention provide a kind of under complicated earth condition, to the electrical Continuous Observation of underground medium, engineering geophysics surveying method effectively and easily.Advanced audio-frequency magnetotelluric magnetic technology (AMT) and two kinds of methods of high-density electric are merged in the present invention, realize complex-terrain area is even gone up to the electrical situation of change of km depth range Continuous Observation underground medium from earth's surface to underground hundreds of rice, in regions with complex terrain, more can show the superiority of this technology.
Embodiment
Below technical solution of the present invention is elaborated.
The present invention seeks to disclose to engineering geophysics prospecting field a kind of technology of new mineralising position, quick location.This method is divided into two steps: first in working range, carry out the terraced surface sweeping work in electricity that swashs, thus the induced polarization anomaly in delineation Chu Ce district; Then, lay audio-frequency magnetotelluric magnetic survey engineering according to induced polarization anomaly, obtain electric structural information accordingly.According to the result of these two steps, may there is the positional information of mineralising in delineation.
Concrete technical scheme is: the method for the electrically continuous change information of a kind of quick obtaining underground medium, comprises the following steps:
(1) first survey and draw reconnoitring area, the level of control topographic mapping data and vertical precision are within the scope of meter level;
(2) prospecting district is laid to geophysics survey grid, or the intersect with large-angle vertical with the outstanding tectonic direction of workspace of the main survey line in survey grid; The two ends extension of survey line exceedes prospecting the more than 20% of section length; Main survey line in survey grid and the outstanding tectonic direction intersect with large-angle of workspace refer to crossing angle between 75 ° ~ 90 °.
(3) every section of laid geophysics survey grid is carried out to audio magnetotelluric method observation; When being carried out to audio magnetotelluric method observation, every section of laid geophysics survey grid controls following parameter area: measurement point, apart from being that between 25m to 50m, spread of electrodes is 50m, adopts tensor to lay measuring station mode; The minimum effective frequency of observation data is not more than 10Hz, and the highest effective frequency is not less than 8000Hz; Every measurement point time series data recording is not less than 25 minutes; Calculate the impedance information of each measuring point by Robust method, impedance data has 10 frequencies at least and is uniformly distributed in the order of magnitude of each frequency.
(4) every section of laid geophysics survey grid is carried out to high-density electric observation; When being carried out to high-density electric observation, every section of laid geophysics survey grid controls following parameter area: effectively Observational depth >=120m, and effectively the length of observation covers whole piece section; Spread of electrodes length≤5 meter; Many 2 times of stack observation frequency.
(5) the above-mentioned two kinds of observation procedure institute image data of inverting, inversion result will guarantee that the ground electric model that two kinds of observation procedures obtain is consistent, otherwise does inverting after revising observation data or refutation process again, consistent to the inversion result of two kinds of methods till;
(6) the inverting ground electric model comprehensively having obtained, draws underground medium continually varying ground electric model.
Further, the method of the electrically continuous change information of a kind of quick obtaining underground medium as above, if the prospecting district in subsurface geology situation complexity (what is for complicated) carries out relevant work, between step (5) and step (6), carry out ground high precision magnetic method observation, explain auxiliary foundation is provided for above-mentioned ground electric model.
Claims (5)
1. a method for the electrically continuous change information of quick obtaining underground medium, is characterized in that, comprises the following steps:
(1) first survey and draw reconnoitring area, the level of control topographic mapping data and vertical precision are within the scope of meter level;
(2) prospecting district is laid to geophysics survey grid, or the intersect with large-angle vertical with the outstanding tectonic direction of workspace of the main survey line in survey grid; The two ends extension of survey line exceedes prospecting the more than 20% of section length;
(3) every section of laid geophysics survey grid is carried out to audio magnetotelluric method observation;
(4) every section of laid geophysics survey grid is carried out to high-density electric observation;
(5) the above-mentioned two kinds of observation procedure institute image data of inverting, inversion result will guarantee that the ground electric model that two kinds of observation procedures obtain is consistent, otherwise does inverting after revising observation data or refutation process again, consistent to the inversion result of two kinds of methods till;
(6) the inverting ground electric model comprehensively having obtained, draws underground medium continually varying ground electric model.
2. the method for the electrically continuous change information of a kind of quick obtaining underground medium as claimed in claim 1, is characterized in that: between step (5) and step (6), carry out ground high precision magnetic method observation.
3. the method for the electrically continuous change information of a kind of quick obtaining underground medium as claimed in claim 1, it is characterized in that: in step (2), the main survey line in survey grid and the outstanding tectonic direction intersect with large-angle of workspace refer to crossing angle between 75 ° ~ 90 °.
4. the method for the electrically continuous change information of a kind of quick obtaining underground medium as claimed in claim 1, it is characterized in that: in step (3), when being carried out to audio magnetotelluric method observation, every section of laid geophysics survey grid controls following parameter area: measurement point distance is between 25m to 50m, spread of electrodes is 50m, adopts tensor to lay measuring station mode; The minimum effective frequency of observation data is not more than 10Hz, and the highest effective frequency is not less than 8000Hz; Every measurement point time series data recording is not less than 25 minutes; Calculate the impedance information of each measuring point by Robust method, impedance data has 10 frequencies at least and is uniformly distributed in the order of magnitude of each frequency.
5. the method for the electrically continuous change information of a kind of quick obtaining underground medium as claimed in claim 1, it is characterized in that: in step (4), when being carried out to high-density electric observation, every section of laid geophysics survey grid controls following parameter area: effectively Observational depth >=120m, and effectively the length of observation covers whole piece section; Spread of electrodes length≤5 meter; Many 2 times of stack observation frequency.
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| CN201210576169.2A CN103901482A (en) | 2012-12-26 | 2012-12-26 | Method of quickly acquiring continuous underground medium electric change information |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106597552A (en) * | 2016-12-25 | 2017-04-26 | 中南大学 | Chinese-character-mi-shaped three-dimensional electrical prospecting method |
| CN107548457A (en) * | 2015-04-30 | 2018-01-05 | 斯伦贝谢技术有限公司 | The method of water saturation degree is estimated in electromagnetic measurement |
| CN114509822A (en) * | 2022-01-20 | 2022-05-17 | 中铁二院工程集团有限责任公司 | Ground-air electromagnetic array surveying method for railway tunnel and survey line arrangement method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107548457A (en) * | 2015-04-30 | 2018-01-05 | 斯伦贝谢技术有限公司 | The method of water saturation degree is estimated in electromagnetic measurement |
| CN106597552A (en) * | 2016-12-25 | 2017-04-26 | 中南大学 | Chinese-character-mi-shaped three-dimensional electrical prospecting method |
| CN114509822A (en) * | 2022-01-20 | 2022-05-17 | 中铁二院工程集团有限责任公司 | Ground-air electromagnetic array surveying method for railway tunnel and survey line arrangement method thereof |
| CN114509822B (en) * | 2022-01-20 | 2023-04-07 | 中铁二院工程集团有限责任公司 | Ground-air electromagnetic array surveying method for railway tunnel and survey line arrangement method thereof |
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