CN107765319A - A kind of Mine Transient Electromagnetic Method resistivity correction method - Google Patents
A kind of Mine Transient Electromagnetic Method resistivity correction method Download PDFInfo
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- CN107765319A CN107765319A CN201710933189.3A CN201710933189A CN107765319A CN 107765319 A CN107765319 A CN 107765319A CN 201710933189 A CN201710933189 A CN 201710933189A CN 107765319 A CN107765319 A CN 107765319A
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- G—PHYSICS
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- 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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- 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
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Abstract
The present invention relates to a kind of Mine Transient Electromagnetic Method resistivity correction method, 1) transmitting coil is placed on point position, received and dispatched away from TR1 is arranged to, instrument data collects primary field valueWith the secondary field value containing mutual induction electromotive force2) transmitting coil position is motionless, will receive and dispatch away from TR2 is increased to, instrument data collects primary field valueWith the secondary field value containing mutual induction electromotive force3) data of collection are substituted into updating formulaMutual induction electromotive force is eliminated, obtains the secondary field signal V of the earth2；4) to the secondary field signal V after elimination mutual induction electromotive force2APPARENT RESISTIVITY calculating and time and depth transfer are carried out, obtains apparent resistivity-depth curve.The present invention carries out resistivity correction by using different transmitting-receivings twice away from observation data, eliminates mutual inductance signal, extracts effective field signal secondary greatly, solves the relatively low problem of dtmf distortion DTMF of Mine Transient Electromagnetic Method resistivity well；Because investigation depth is directly proportional to resistivity, the investigation depth of Mine Transient Electromagnetic Method is improved.
Description
Technical field
The present invention relates to geology and exploration geophysics field, more particularly to a kind of Mine Transient Electromagnetic Method resistivity correction
Method.
Background technology
Transient electromagnetic method (Transient Electromagnetic Method, abbreviation TEM) is a kind of establishes in electromagnetism
Time-domain artificial source's electromagnetic exploration method on the basis of principle of induction.It is to be issued using earth-free loop line or earth lead to ground
Primary field is penetrated, after a VOF, the inducted secondary field as caused by underground medium is measured and changes with time, is found to reach
A kind of geophysical exploration method of various geologic objectives.When transient electromagnetic method being applied into down-hole detecting, referred to as mine
Transient electromagnetic method (Mine Transient Electromagnetic Method, abbreviation MTEM).
Mine Transient Electromagnetic Method is detected using the length of side (or circular) small Loop source square less than 2m multiturn, because of underground
Space limits, and distance is near or even overlapping between transmitting coil and receiving coil, therefore stronger mutual induction electromotive force, its intensity be present
Much larger than the earth secondary field useful signal, the relatively low distortion of resistivity calculated is caused, investigation depth also decreases, and gives data solution
Release and bring difficulty.For example, in mine water disaster detection, because the resistivity for being influenceed to calculate by mutual induction electromotive force is integrally relatively low, it is
Determination hydrous fluids scope at present can only carry out judgement explanation (looking for relative low-resistance region again i.e. in low-resistance) with relative resistivities value,
Such result of detection lacks credibility.In order to obtain accurate data processed result it may first have to eliminate mutual inductance signal, extract
Go out effective field signal secondary greatly.
The content of the invention
For above-mentioned deficiency of the prior art, the present invention provides a kind of Mine Transient Electromagnetic Method resistivity correction method,
To solve the relatively low problem of dtmf distortion DTMF of Mine Transient Electromagnetic Method resistivity.
To achieve the above object, the technical solution used in the present invention is：A kind of Mine Transient Electromagnetic Method resistivity correction
Method, comprise the following steps：
Transmitting coil is placed on point position by step 1), is received and dispatched away from TR1 is arranged to, instrument data collects primary field
ValueWith the secondary field value containing mutual induction electromotive forceThe transmitting-receiving is away between transmitting coil center and receiving coil center
Distance；
Step 2) transmitting coil position is motionless, will receive and dispatch away from TR2 is increased to, instrument data collects primary field value
With the secondary field value containing mutual induction electromotive force
The data of collection are substituted into updating formula by step 3)Mutual induction electromotive force is eliminated, is obtained
Greatly secondary field signal V2；
Step 4) is to the secondary field signal V after eliminating mutual induction electromotive force2APPARENT RESISTIVITY calculating and time and depth transfer are carried out,
Obtain apparent resistivity-depth curve.
Further, the transmitting-receiving is less than or equal to 10m away from TR1.
Further, the transmitting-receiving meets 2m≤(TR2-TR1)≤10m away from TR2.
Further, the receiving coil can be circular reception coil or square reception line according to the difference of detection instrument
Circle or irregular coil.
The APPARENT RESISTIVITY calculates and time and depth transfer method is identical with conventional method.
Compared with the conventional method, the inventive method has the advantage that as follows with effect：(1) present invention is not by using twice
Resistivity correction is carried out away from observation data with transmitting-receiving, mutual inductance signal can be eliminated, extract effective field signal secondary greatly, can
Solves the relatively low problem of dtmf distortion DTMF of Mine Transient Electromagnetic Method resistivity well；(2) because investigation depth is directly proportional to resistivity, solve
While resistivity relatively low problem, the investigation depth of Mine Transient Electromagnetic Method is improved.
Brief description of the drawings
Fig. 1 be transmitting-receiving away from for TR1 when schematic device.
Fig. 2 be transmitting-receiving away from for TR2 when schematic device.
Fig. 3 is field test observation signal.
Fig. 4 is field test result
In figure, 1. transmitting coils, 2. receiving coils, 3. emitters, 4. main frames.
Embodiment
Referring to specific embodiment, the present invention will be described in detail.
As shown in figure 1 and 2, a kind of Mine Transient Electromagnetic Method resistivity correction method, comprises the following steps：
(1) transmitting coil 1 is connected with emitter 3, receiving coil 2 is connected with main frame 4, and emitter 3 is connected with main frame 4；
Transmitting coil 1 is placed on point position, the center of receiving coil 2 and transmitting coil 1 is placed within 10m, hold-in winding
Center line it is perpendicular to the ground, receive and dispatch away from TR1 is arranged to, instrument data collects primary field valueWith containing mutual induction electromotive force
Secondary field value(2) position of transmitting coil 1 is motionless, adjusts the position of receiving coil 2, will transmitting-receiving away from increasing to TR2, instrument
Data acquisition obtains primary field valueWith the secondary field value containing mutual induction electromotive forceIt is described transmitting-receiving away from TR2 meet 2m≤
(TR2-TR1)≤10m；(3) data of collection are substituted into updating formulaEliminate mutual induction electromotive force,
Obtain the secondary field signal V of the earth2；(4) to the secondary field signal V after elimination mutual induction electromotive force2Carry out APPARENT RESISTIVITY calculate and
Time and depth transfer, obtain apparent resistivity-depth curve.
Referring to specific embodiment, the present invention will be described in detail.
Embodiment 1
In order to illustrate the resistivity correction effect of the inventive method, give conventional method and the inventive method to having a competition
Test result.
Conventional method and the inventive method detection test are carried out in certain mine laneway.Detect place geological condition
Know, according to geology and drilling data, construction and water content without exception in investigative range, the Ω m of average formation resistivity 80.Detection
Instrument uses same model Transient Electromagnetic Apparatus, the circle transmitting coil of 1.5m × 1.5m × 81,25Hz system frequencies, 30 sampling times
Door (the logarithm decile such as μ s of 6.8 μ s~6978).
Conventional method concretely comprises the following steps：
(1) transmitting coil 1 is placed on point position, received and dispatched away from TR1=8m is arranged to, instrument data collects once
Field valueWith the secondary field value containing mutual induction electromotive force(Fig. 3 mid-range signals).
(2) to secondary field signalAPPARENT RESISTIVITY calculating and time and depth transfer are carried out, it is bent to obtain apparent resistivity-depth
Line (Fig. 4 dotted lines).
The inventive method concretely comprises the following steps：
(1) it is identical with common process steps (1).
(2) transmitting coil position is motionless, will receive and dispatch away from TR2=12m is increased to, instrument data collects primary field valueWith the secondary field value containing mutual induction electromotive force
(3) data of collection are substituted into updating formulaMutual induction electromotive force is eliminated, obtains the earth
Secondary field signal V2(plus signal in Fig. 3).
(4) to the secondary field signal V after elimination mutual induction electromotive force2APPARENT RESISTIVITY calculating and time and depth transfer are carried out, is obtained
To apparent resistivity-depth curve (plus line in Fig. 4).
From fig. 4, it can be seen that conventional method result of detection apparent resistivity is 3.1~11.5 Ω m, it is averaged far below actual formation
Resistivity 80 Ω m, investigation depth 73.1m.The Ω m of the inventive method result of detection apparent resistivity 46.4~136.8, with reality
Border geological condition is consistent, and investigation depth reaches 147.3m.The contrast of two methods result of detection is visible, and the inventive method effectively solves
Resistivity relatively low problem of dtmf distortion DTMF, and improve investigation depth.
Claims (4)
- A kind of 1. Mine Transient Electromagnetic Method resistivity correction method, it is characterised in that comprise the following steps：Transmitting coil is placed on point position by step 1), is received and dispatched away from TR1 is arranged to, instrument data collects primary field valueWith the secondary field value containing mutual induction electromotive forceIt is described transmitting-receiving away between transmitting coil center and receiving coil center away from From；Step 2) transmitting coil position is motionless, will receive and dispatch away from TR2 is increased to, instrument data collects primary field valueWith containing The secondary field value of mutual induction electromotive forceThe data of collection are substituted into updating formula by step 3)Mutual induction electromotive force is eliminated, obtains the earth Secondary field signal V2；Step 4) is to the secondary field signal V after eliminating mutual induction electromotive force2APPARENT RESISTIVITY calculating and time and depth transfer are carried out, is obtained Apparent resistivity-depth curve.
- A kind of 2. Mine Transient Electromagnetic Method resistivity correction method according to claim 1, it is characterised in that the transmitting-receiving It is less than or equal to 10m away from TR1.
- A kind of 3. Mine Transient Electromagnetic Method resistivity correction method according to claim 1, it is characterised in that the transmitting-receiving Meet 2m≤(TR2-TR1)≤10m away from TR2.
- A kind of 4. Mine Transient Electromagnetic Method resistivity correction method according to claim 1, it is characterised in that the reception Coil is circular coil or square coil or irregular coil.
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| CN201710933189.3A CN107765319B (en) | 2017-10-09 | 2017-10-09 | A kind of Mine Transient Electromagnetic Method resistivity correction method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109343134A (en) * | 2018-11-27 | 2019-02-15 | 中煤科工集团西安研究院有限公司 | A kind of Transient Electromagnetic Method in Mine data analysis interpretation method and system |
| CN110703346A (en) * | 2019-11-14 | 2020-01-17 | 张道清 | Same-frequency and same-source ratio measurement method for natural electric field |
| CN111980756A (en) * | 2020-09-01 | 2020-11-24 | 兖矿集团有限公司 | Abnormity monitoring method and abnormity monitoring system for mine roof |
| CN112593919A (en) * | 2020-12-01 | 2021-04-02 | 中海油田服务股份有限公司 | Resistivity correction method and device and storage medium |
| CN114089426A (en) * | 2021-05-26 | 2022-02-25 | 华北科技学院(中国煤矿安全技术培训中心) | Improved U-shaped spiral source transient electromagnetic full-space directional detection method |
| CN115144911A (en) * | 2022-06-17 | 2022-10-04 | 中煤科工集团西安研究院有限公司 | Method for advanced detection of formation resistivity by using electromagnetic waves of tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109343134A (en) * | 2018-11-27 | 2019-02-15 | 中煤科工集团西安研究院有限公司 | A kind of Transient Electromagnetic Method in Mine data analysis interpretation method and system |
| CN110703346A (en) * | 2019-11-14 | 2020-01-17 | 张道清 | Same-frequency and same-source ratio measurement method for natural electric field |
| CN111980756A (en) * | 2020-09-01 | 2020-11-24 | 兖矿集团有限公司 | Abnormity monitoring method and abnormity monitoring system for mine roof |
| CN111980756B (en) * | 2020-09-01 | 2021-12-03 | 兖矿集团有限公司 | Abnormity monitoring method and abnormity monitoring system for mine roof |
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| CN114089426A (en) * | 2021-05-26 | 2022-02-25 | 华北科技学院(中国煤矿安全技术培训中心) | Improved U-shaped spiral source transient electromagnetic full-space directional detection method |
| CN114089426B (en) * | 2021-05-26 | 2023-11-10 | 华北科技学院(中国煤矿安全技术培训中心) | Improved U-shaped spiral source transient electromagnetic full-space directional detection method |
| CN115144911A (en) * | 2022-06-17 | 2022-10-04 | 中煤科工集团西安研究院有限公司 | Method for advanced detection of formation resistivity by using electromagnetic waves of tunnel |
| CN115144911B (en) * | 2022-06-17 | 2024-06-04 | 中煤科工集团西安研究院有限公司 | Method for advanced detection of stratum resistivity by tunnel electromagnetic waves |
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