CN104360399B - Transient electromagnetic detecting method and device under long wired earth seedbed - Google Patents
Transient electromagnetic detecting method and device under long wired earth seedbed Download PDFInfo
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Abstract
Transient electromagnetic detecting method and device under a kind of long wired earth seedbed, including the earth lead as emission source with as the sub-receiver device received；Earth lead is arranged in ground；Ground utilize holed or utilized existing underground passage, in hole along boring direction or underground passage along roadway direction pointwise arrange receiving transducer；Described earth lead is made up of three groups of earth leads；Wherein two groups parallel to each other, simultaneously the most vertical with the 3rd group.The present invention relates to transient electromagnetic detection device under long wired earth seedbed, the electric field that earth lead produces intersects with the stratum with different resistivity value, the faradic current that horizontal component excites is conducive to the detection of post non of low resistance body, vertical component is conducive to the detection of high resistance body at the electric charge that stratum electrical interface senses, the laying of the long wire of the present invention does not only have greater flexibility compared with big loop line, and is also beneficial to detect high resistant objective body.
Description
Technical field
The present invention relates to a kind of geophysical reconnaissance method, specifically, relate to a kind of long wired earth seedbed lower wink
Become electromagnetic exploration method.
Background technology
Transient electromagnetic field method (Transient Electromagnetic Method is called for short TEM) is a kind of foundation at electricity
Time domain artificial source's electromagnetic exploration method on the basis of magnetic induction principle.It is to utilize earth-free loop line or earth lead to underground
Launch primary field, close at primary field and have no progeny, measure the inducted secondary field produced by underground medium over time, reach to seek
Look for a kind of geophysical exploration method of various geologic objective.
Fig. 1 is the equipment figure of tradition ground Loop source transient electromagnetic method, and wherein applying more is Genter loop dress
Put, i.e. at surface deployment loop line, measure at loop line center point, owing to this device is abnormal simple, it is easy to explain, obtained wide
General application.
But, when at ground receiver, electromagnetic field needs to travel to ground receiving wastewater facility from out-of-the way position, could be collected
Arrive.Time and distance that electromagnetic field is propagated are the most long, and are highly prone to emission source and receive the impact of heterogeneous body between device.
If can be received near the position of abnormal object body in underground, then electromagnetic field is propagated time and distance are relatively short, and
And farthest avoid send out, receive between the impact of heterogeneous body, it is possible to observe largest outliers, substantially increase mesh
The detectivity of standard type.
Traditional ground well transient electromagnetic method, it is simply that boring near ground on arrange earth-free coil as emission source,
The inducted secondary field produced along boring direction point-to-point measurement underground medium in the borehole with receiving transducer, its Method And Principle such as Fig. 2
Shown in.Bi-directional pulse current it is provided with in earth-free loop line, thus excitation electromagnetic field, under the excitation of this electromagnetic field, underground
Medium is sensed and is produced vortex current, when the pulse current of transmitting loop jumps to zero from peak value, and exciting field disappears immediately, and
Inductive loop in underground medium disappears the most immediately, but has an attenuation process, and the feature of this process is electrical with underground
Structure is relevant.By inducted secondary field variation characteristic on room and time in research well, research boring can be reached around
The purpose of electrical structure distribution, such that it is able to differentiate the geologic body by well, near shaft bottom accurately, or deduction is shown in
The spatial distribution of ore body and bearing of trend.
When ground well TEM measures, the feature of the ground well TEM response curve observed, on the one hand depends on conduction ore body
Electric conductivity and geometric shape, on the other hand also the most relevant with the mutual alignment between transmitting loop, conductor, receiving transducer.In reality
In the work of border, when existing data is not enough to be accurately positioned anomalous body, multiple can be arranged in ground different azimuth
It is emitted back towards line, such as Fig. 3.Measure one time in the borehole with probe when each loop line excites, obtain the response curve of different characteristic, from
And obtain more rich ground electrical information, contribute to qualitative, quantitative interpretation to anomalous body.
Owing to the symmetry of Loop source makes the field effect of cancelling out each other, energy is decayed comparatively fast in the earth formation, and investigation depth is relatively
Shallow, it is difficult to when the length of side is bigger lay, Loop source is only capable of producing tangential electric field component, it is easy to excite faradic current in low resistivity layer,
Highly beneficial to detection low resistivity layer, but when detecting resistive formation, Loop source is not best device form.
When receiving space and being coal mine roadway or this approximate horizontal situation in tunnel, conventional ground well observation equipment becomes
Form as shown in Figure 5.I.e. at the bigger coil of surface deployment, strengthen supply current guarantee investigation depth；Down-hole is entered along tunnel
Row receives, and receiving coil is relatively near away from objective body, receives signal strong, can improve resolution and detection accuracy, strengthens " side regards " ability.
Meanwhile, change ground launch coil and the relative position of receiving coil in tunnel, or the method direction of change receiving coil, available
In multilamellar Mined-Out Areas.
Summary of the invention
For above-mentioned deficiency of the prior art, the present invention provides a kind of long wire improving surveying accuracy and accuracy to connect
Transient electromagnetic detection device under seedbed, ground.
The technical solution used in the present invention is:
Transient electromagnetic detection device under a kind of long wired earth seedbed,
Including ground launch source earth lead and sub-receiver device；Earth lead is arranged in ground；
Utilize on ground and holed or utilized existing underground passage, along boring direction or at underground passage in hole
Receiving transducer is arranged along roadway direction pointwise；Described earth lead is made up of three groups of earth leads；Wherein two groups parallel to each other, with
Shi Yu tri-groups is vertical.
The distance being approximately equal to the length to earth lead and boring of described earth lead and be substantially equal to burying of destination layer
Hide the degree of depth.
A length of 800 meters to 1500 meters of described earth lead.
The transmitting power of described long earth lead emission source is 30 kilowatts.
A kind of transient electromagnetic detecting method under long wired earth seedbed, is provided with bi-directional pulse current in earth lead,
Earth lead produces excitation electromagnetic field, and underground medium is sensed and produces vortex current；Receiving transducer is in the borehole along boring side
The inducted secondary field produced to point-to-point measurement underground medium, enters each group in the three groups of earth leads being arranged in ground respectively
Row is launched；The receiving transducer arranged along boring direction receives the inducted secondary field letter that three groups of emission sources produce at underground medium respectively
Number.
Transient electromagnetic detection device under a kind of long wired earth seedbed,
Including as the earth lead of emission source and sub-receiver device；Earth lead is arranged on ground；
In coal mine roadway or tunnel, receiving transducer is arranged in pointwise in the horizontal direction；Described earth lead is by three groups of ground connection
Wire is constituted；Wherein two groups parallel to each other, simultaneously the most vertical with the 3rd group.
A kind of transient electromagnetic detecting method under long wired earth seedbed, is provided with bipolarity rectangular pulse electricity in earth lead
Stream, in underground excitation electromagnetic field, underground medium is sensed and is produced vortex current；Receiving transducer is on coal mine roadway or edge, tunnel
Horizontal direction pointwise receives the inducted secondary field that underground medium produces, respectively every in the three groups of earth leads being arranged in ground
Launch for one group；The receiving transducer arranged in the horizontal direction in coal mine roadway or tunnel receives three groups of emission sources respectively and exists
The inducted secondary field signal that underground medium produces.
The beneficial effect of hinge structure of the present invention:
Transient electromagnetic detection device under the present invention long wired earth seedbed, the electric field of earth lead with there is different resistivity
The stratum of value is intersected, and the faradic current that horizontal component excites is conducive to the detection of post non of low resistance body, and vertical component is at stratum electrical interface
The electric charge of sensing is conducive to the detection of high resistance body, and under rectangular coordinate, whole 6 components of electromagnetic field all have detectivity, for deeply
Portion's large ore deposit (Tibetan) information detection provides more probability with extraction principle and method；The laying of long wire and big loop line
Compare greater flexibility.
Accompanying drawing explanation
The equipment figure of Fig. 1 tradition Loop source transient electromagnetic method；
Fig. 2 ground well transient electromagnetic principle schematic；
Fig. 3 ground well transient electromagnetic operating diagram；
Fig. 4 ground connection of the present invention seedbed well (vertically) transient electromagnetic device schematic diagram；
Fig. 5 routine Loop source ground well Transient electromagnetic measure device；
Fig. 6 ground connection of the present invention seedbed well (level) transient electromagnetic equipment schematic diagram；
Fig. 7 uses the most methodical ground connection seedbed well transient electromagnetic test figure；
Fig. 8 uses the ground connection seedbed well transient electromagnetic test comparison result figure of the present invention.
Detailed description of the invention
Referring to the drawings and embodiment the present invention will be described in detail:
Accompanying drawing 1-8 understands, transient electromagnetic detection device under a kind of long wired earth seedbed,
Including ground launch source earth lead and sub-receiver device；Earth lead is arranged in ground；
Utilize on ground and holed or utilized existing underground passage, along boring direction or at underground passage in hole
Receiving transducer is arranged along roadway direction pointwise；Described earth lead is made up of three groups of earth leads；Wherein two groups parallel to each other, with
Shi Yu tri-groups is vertical.
The distance being approximately equal to the length to earth lead and boring of described earth lead and be substantially equal to burying of destination layer
Hide the degree of depth.
A length of 800 meters to 1500 meters of described earth lead.
The transmitting power of described long earth lead emission source is 30 kilowatts.
A kind of transient electromagnetic detecting method under long wired earth seedbed, is provided with bi-directional pulse current in earth lead,
Earth lead produces excitation electromagnetic field, and underground medium is sensed and produces vortex current；Receiving transducer is in the borehole along boring side
The inducted secondary field produced to point-to-point measurement underground medium, enters each group in the three groups of earth leads being arranged in ground respectively
Row is launched；The receiving transducer arranged along boring direction receives the inducted secondary field letter that three groups of emission sources produce at underground medium respectively
Number.
Transient electromagnetic detection device under a kind of long wired earth seedbed,
Including as the earth lead of emission source and sub-receiver device；Earth lead is arranged on ground；
In coal mine roadway or tunnel, receiving transducer is arranged in pointwise in the horizontal direction；Described earth lead is by three groups of ground connection
Wire is constituted；Wherein two groups parallel to each other, simultaneously the most vertical with the 3rd group.
A kind of transient electromagnetic detecting method under long wired earth seedbed, is provided with bipolarity rectangular pulse electricity in earth lead
Stream, in underground excitation electromagnetic field, underground medium is sensed and is produced vortex current；Receiving transducer is on coal mine roadway or edge, tunnel
Horizontal direction pointwise receives the inducted secondary field that underground medium produces, respectively every in the three groups of earth leads being arranged in ground
Launch for one group；The receiving transducer arranged in the horizontal direction in coal mine roadway or tunnel receives three groups of emission sources respectively and exists
The inducted secondary field signal that underground medium produces.
The beneficial effect of hinge structure of the present invention:
Transient electromagnetic detection device under the present invention long wired earth seedbed, the electric field of earth lead with there is different resistivity
The stratum of value is intersected, and the faradic current that horizontal component excites is conducive to the detection of post non of low resistance body, and vertical component is at stratum electrical interface
The electric charge of sensing is conducive to the detection of high resistance body, and under rectangular coordinate, whole 6 components of electromagnetic field all have detectivity, for deeply
Portion's large ore deposit (Tibetan) information detection provides more probability with extraction principle and method；The laying of long wire and big loop line
Compare greater flexibility.
For tunnel or reception space, tunnel, this patent proposes: use ground connection source to replace Loop source, it is simply that in tunnel or
Each group of wire source in these three groups, as emission source, is carried out sending out by the ground configuration above person tunnel three groups of earth leads respectively
Penetrate, the inducted secondary field produced along tunnel or direction, tunnel point-to-point measurement underground medium in underground with probe, its Method And Principle
As shown in Figure 3.Bipolarity squared-pulse current it is provided with, at underground excitation electromagnetic field, swashing at this electromagnetic field in earth lead
Encouraging down, underground medium is sensed and is produced vortex current, and when the pulse current of transmitting loop jumps to zero from peak value, exciting field stands
I.e. disappear, and the inductive loop in underground medium disappear the most immediately, but have a decay process, the feature of this process with
Underground electrical structure distribution is relevant.By inducted secondary field variation characteristic on room and time in research well, can reach
The purpose of research boring Electrical distribution structure around, such that it is able to find to infer spatial distribution and the bearing of trend of objective body.
In order to the superiority of patent of invention is described, The present invention gives test comparison result.
Fig. 7 and Fig. 8 is ground connection seedbed well transient electromagnetic test comparison result figure.Wherein, Fig. 7 is the observation side using Fig. 1
The observed result that case obtains；Fig. 8 is the observed result using the scheme of Fig. 6 to obtain.From figure 7 it can be seen that employing traditional method,
Together, resolution degree is bad for two abnormal superpositions, from figure 8, it is seen that use this patent of invention method to be observed, and two
Individual exception is clearly separated, and illustrates objective body resolution degree higher.
Claims (3)
1. transient electromagnetic detection device under one kind long wired earth seedbed, it is characterised in that:
Including the earth lead as emission source with as the sub-receiver device received；Earth lead is arranged in ground；
Ground utilize holed or utilized existing underground passage, in hole along boring direction or at underground passage along lane
Receiving transducer is arranged in the pointwise of direction, road；Described earth lead is made up of three groups of earth leads；Wherein two groups parallel to each other, simultaneously with
3rd group vertical；
Being provided with bi-directional pulse current in earth lead, earth lead produces excitation electromagnetic field, and underground medium is sensed and produces
Raw vortex current；Receiving transducer in the borehole along boring direction or at underground passage along roadway direction point-to-point measurement underground medium
The inducted secondary field produced；
By research inducted secondary field variation characteristic on room and time, such that it is able to infer objective body spatial distribution with
Bearing of trend.
Transient electromagnetic detection device under the longest wired earth seedbed, it is characterised in that:
The length of described earth lead is equal to earth lead and the distance of boring and the buried depth equal to destination layer.
Transient electromagnetic detection device under the longest wired earth seedbed, it is characterised in that:
A length of 800 meters to 1500 meters of described earth lead.
Transient electromagnetic detection device under the longest wired earth seedbed, it is characterised in that:
The transmitting power of described emission source is 30 kilowatts.
5. a transient electromagnetic detecting method under long wired earth seedbed, is provided with bi-directional pulse current in earth lead, connects
Ground wire produces excitation electromagnetic field, and underground medium is sensed and produces vortex current；Receiving transducer is in the borehole along boring direction
The inducted secondary field that point-to-point measurement underground medium produces, it is characterised in that respectively in the three groups of earth leads being arranged in ground
Each group launch；The receiving transducer arranged along boring direction receives the sense that three groups of emission sources produce at underground medium respectively
Answer secondary field signal；By research inducted secondary field variation characteristic on room and time, such that it is able to infer objective body
Spatial distribution and bearing of trend, in described three groups of earth leads two groups parallel to each other, simultaneously the most vertical with the 3rd group.
6. transient electromagnetic detection device under one kind long wired earth seedbed, it is characterised in that
Including the earth lead as emission source with as the sub-receiver device received；Earth lead is arranged on ground；It is special
Levy and be: receiving transducer is arranged in pointwise in the horizontal direction in coal mine roadway or tunnel；Described earth lead is by three groups of ground connection
Wire is constituted；Wherein two groups parallel to each other, simultaneously the most vertical with the 3rd group；
Being provided with bi-directional pulse current in earth lead, earth lead produces excitation electromagnetic field, and underground medium is sensed and produces
Raw vortex current；The receiving transducer sensing two that point-to-point measurement underground medium produces in the horizontal direction in coal mine roadway or tunnel
Secondary field；
By research inducted secondary field variation characteristic on room and time, such that it is able to infer objective body spatial distribution with
Bearing of trend.
7. a transient electromagnetic detecting method under long wired earth seedbed, is provided with bipolarity rectangular pulse electricity in earth lead
Stream, in underground excitation electromagnetic field, underground medium is sensed and is produced vortex current；Receiving transducer is on coal mine roadway or edge, tunnel
Horizontal direction pointwise receives the inducted secondary field that underground medium produces, it is characterised in that connect be arranged in ground three groups respectively
Launch for each group in ground wire；The receiving transducer arranged in the horizontal direction in coal mine roadway or tunnel receives respectively
The inducted secondary field signal that three groups of emission sources produce at underground medium；By research inducted secondary field change on room and time
Change feature, such that it is able to infer the spatial distribution of objective body and bearing of trend, in described three groups of earth leads two groups parallel to each other,
The most vertical with the 3rd group.
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| CN105467460B (en) * | 2015-12-28 | 2018-01-05 | 中国石油天然气集团公司 | electromagnetic exploration method and device |
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| CN109884720B (en) * | 2019-03-21 | 2021-07-30 | 武汉长盛工程检测技术开发有限公司 | Device and method for determining three-dimensional composite frequency electromagnetic detection of water-rich ground well |
| CN111965718B (en) * | 2019-05-20 | 2023-09-26 | 中国石油天然气集团有限公司 | Electromagnetic data acquisition method and device based on four-direction excitation |
| CN111856595A (en) * | 2020-07-28 | 2020-10-30 | 广州海洋地质调查局 | Large loop source transient electromagnetic global apparent resistivity determination method and processing terminal |
| CN112433254A (en) * | 2020-12-03 | 2021-03-02 | 长江大学 | Method for exploring water disaster position of coal mine working face |
| CN113009559B (en) * | 2021-03-02 | 2022-02-18 | 中国科学院地质与地球物理研究所 | Earthquake evaluation method based on multi-type geophysical data |
| CN113093292A (en) * | 2021-04-09 | 2021-07-09 | 中国矿业大学 | Method for grouting coal seam roof through ground-hole transient electromagnetic monitoring |
| CN113960675B (en) * | 2021-10-21 | 2024-04-05 | 武汉鑫泽科技有限公司 | Working arrangement method of conductive flow field |
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