CN102305948B - Measure the three-dimensional three-dimensional artificial source's electromagnetic exploration method changing of subsurface resistivity - Google Patents
Measure the three-dimensional three-dimensional artificial source's electromagnetic exploration method changing of subsurface resistivity Download PDFInfo
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- CN102305948B CN102305948B CN201110136911.3A CN201110136911A CN102305948B CN 102305948 B CN102305948 B CN 102305948B CN 201110136911 A CN201110136911 A CN 201110136911A CN 102305948 B CN102305948 B CN 102305948B
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Abstract
The invention discloses three-dimensional artificial source's electromagnetic exploration method that a kind of solid of measuring subsurface resistivity changes: in region to be reconnoitred, arrange one or arrange several transmission current sources simultaneously; Treat that survey area arranges some slotted lines simultaneously, on each survey line, arrange several measuring points; On each measuring point of each survey line of having laid, lay the collecting electrode or the magnetic probe that equate with measuring point number simultaneously; With wire, each being measured to collecting electrode or magnetic probe and corresponding electromagnetic signal receiver couples together; The exciting current of the different frequency from high to low or from low to high of a series of frequencies of underground transmission from transmission power supply to this region; Each receiver receives the electric or magnetic response signal of subsurface material to each frequency excitation electric current simultaneously, and therefrom extracts subsurface resistivity information. The present invention can significantly improve efficiency and the resolution capability of electromagnetic survey, greatly accelerates preliminry basic research speed, reduces costs, and saves the energy, the needs of adapt to economic development fast development to resource exploration.
Description
Technical field
The present invention relates to a kind of artificial source's electromagnetism of measuring underground apparent resistivity distribution in geophysics of reconnoitringExploitation method, particularly one can obtain the underground space once along three sides of x, y, z simultaneouslyTo the electromagnetic exploration method of change in apparent resistivity.
Background technology
Underground is by different rocks, mineral composition. Different rock, mineral have different electricityResistance rate. Measure the spatial distribution of subsurface resistivity, can find out the position of underground different rock forming minerals,Reach the object of finding underground mineral or reconnoitring other buried target.
Existing artificial source's electromagnetic exploration method, no matter be the controllable source audio-frequency magnetotelluric magnetic method of frequency domain,Or being the transient electromagnetic method of time-domain, is all survey line, measuring point ground one by one one by one in region to be reconnoitredMeasure in turn. Existing frequency domain electromagnetic methods once can only send the exciting current of a frequency,Measure the electromagnetic response of a frequency (degree of depth), obtain the apparent resistivity of a degree of depth. TimeAlthough territory electromagnetic method is the electromagnetic response (or its derivative) of measuring in the time period, can not be onceObtain the apparent resistivity of many surveys line, multiple measuring point, multiple degree of depth simultaneously. Therefore, existing electromagnetismExploitation method efficiency is very low. Each measurement can only obtain the apparent resistivity of a position, a degree of depth,No matter be the time of expending, the information content of acquisition, or the cost of cost, all very uneconomical, over the groundThe resolution ratio of lower target is low, is difficult to the needs of adapt to economic development fast development to resource exploration.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency of existing artificial source's electromagnetic exploration method,Provide a kind of better, can obtain once subsurface resistivity longitudinally, laterally and edge simultaneouslyArtificial source's electromagnetic exploration method of vertical 3 D stereo situation of change. At certain whole model to be reconnoitredOn all surveys line that enclose, all measuring points, arrange and the same number of multiple the connecing of measuring point once simultaneouslyReceive electrode or magnetic probe and many receivers, arrange many in position as required simultaneously(cover) transmitter, each transmitter sends respectively the exciting current of different frequency group, and many transmitters are sameIn time, sends, and realizes the exciting current that sends once all whole operating frequencies. Open each simultaneouslyAll receivers of each measuring point of survey line receive the electromagnetic response of all frequencies, one once simultaneouslyInferior property ground obtains each measuring point of area whole to be reconnoitred, the apparent resistivity of each projected depth simultaneously,Significantly improve efficiency and the resolution capability of electromagnetic exploration method, greatly accelerate the speed of preliminry basic research, fallLow cost, saves the energy, meets better the needs of rapid economic development to resource exploration.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: measure subsurface resistivityThe three-dimensional three-dimensional artificial source's electromagnetic exploration method changing is:
1), in region to be reconnoitred, arrange one or more transmission current sources;
2), in region to be reconnoitred, arrange some slotted lines, if arrange on each survey line simultaneouslyA dry measuring point;
3), on each measuring point of each survey line of having laid, lay respectively connect corresponding with measuring pointReceive electrode or magnetic probe, collecting electrode or magnetic probe number equate with measuring point number;
4) with wire, each collecting electrode or magnetic probe and electromagnetic signal receiver are coupled together;
5) from sending power supply to a series of frequencies of underground transmission in this region from high to low, or from low to highThe exciting current of different frequency;
6) each receiver is measured the electric or magnetic response of subsurface material to each frequency excitation electric current simultaneouslySignal, and therefrom extract underground apparent resistivity information.
The current source transmitter of three-dimensional artificial source's electromagnetic exploration method, can once send simultaneously contain manyThe electric current of individual basic frequency composition, treat survey area can arrange multiple different, can be once simultaneouslyThe excitation power supply of the electric current that transmission contains multiple basic frequency compositions.
The receiver of artificial source's electromagnetic exploration method, can once receive simultaneously from underground, containThe electromagnetic response signal of multiple basic frequency compositions, the electromagnetic response that extracts respectively each frequency content is believedNumber amplitude, phase place, real component, imaginary component. Automatically resolve looking of each frequency (each degree of depth)Resistivity, can, on whole surveys line of institute's survey area, measuring point, arrange with measuring point number and equateCollecting electrode, magnetic probe and receiver, measure the electromagnetic response on whole measuring points simultaneously.
It is even whole that the present invention can obtain the interior bulk area of institute's survey area rapidly, once simultaneouslyThe distributed in three dimensions image of apparent resistivity on individual region, detects longitudinally x of apparent resistivity, laterally y andThe situation of change of vertical z. Greatly improve operating efficiency and the resolution of the exploration of artificial source's frequency domain electromagnetic methodsAbility, significantly accelerates the progress of reconnoitring, and shortens exploration cycle, and the geological effect having obtained, reduces costs,The needs of adapt to economic development fast development to resource exploration.
Brief description of the drawings
Fig. 1 is 3 D electromagnetic method work layout drawing;
Fig. 2 is the three-dimensional image of the underground change in apparent resistivity that obtains of the present invention.
Wherein:
1.: transmitter; 2.: sender electrode; 3.: survey line; 4.: measuring point; 5.: collecting electrode;
6.: receiver; 7.: apparent resistivity curve; 8.: high resistant anticline.
Detailed description of the invention
Below in conjunction with accompanying drawing 2, the specific embodiment of the present invention is described.
Referring to accompanying drawing 2. At the select location of a selected survey area, arrange of the present inventionSend current source (comprise transmitter 1. with sender electrode 2.), with send current source separated by a distanceRegion, arrange survey line of the present invention 3. with measuring point 4.. On each measuring point, arrange measurement electrode5. and receiver 6.. Start and send power supply and send into multiple basic frequencies that contain of the present invention to undergroundThe electric current of composition, synchronously opens the receiver on each survey line, each measuring point, receives from ground simultaneouslyUnder, the ground electroresponse signal that contains multiple basic frequency compositions that carries subsurface material electrical information.Start receiver in-built, the computer that stores the software program that resolves underground apparent resistivity, to surveyingThe ground electroresponse signal of measuring is analyzed, and automatically calculates the apparent resistivity of each frequency, drafting patternIn the apparent resistivity～frequency curve shown in 7.. According to the form of curve and the regularity of distribution, deduction is published pictureIn the underground ground electricity structure (this illustrated example is high resistant anticline) shown in 8..
The process brief introduction of resolving apparent resistivity is following (to measure electric field strength ExFor example).
First receiver measures the potential difference between two measurement electrode, according toObtain this measuring pointElectric field strength Ex. Again according to theoretical formula
In formula, I sends the electric current of current source to underground transmission, and dL is the distance between two sender electrodes, rBe that observation station arrives and sends the distance at current source center, ρ is the resistivity of subsurface material to be asked,To seeMeasuring point is with respect to sending the azimuth of current source,It is electromagnetic wave number. ω is work frequencyRate, μ is the permeability of subsurface material, generally gets π × 10, μ=4-7H/m. Owing to also containing in wave number kThe resistivity of unknown subsurface material, adopting above-mentioned formula to resolve apparent resistivity needs computer manyInferior iteration, progressively revises the algorithm approaching.
Claims (2)
1. measure the three-dimensional three-dimensional artificial source's electromagnetic exploration method changing of subsurface resistivity, it is characterized in that, the method is:
1), in region to be reconnoitred, arrange that sends a current source;
2) in region to be reconnoitred, arrange some slotted lines simultaneously, on each survey line, arrange several measuring points;
3), on each measuring point of each survey line of having laid, lay respectively collecting electrode or the magnetic probe corresponding with measuring point;
4) with wire, each collecting electrode or magnetic probe and electromagnetic signal receiver are coupled together;
5) from sending power supply to a series of frequencies of underground transmission in this region from high to low, or the exciting current of different frequency from low to high;
6) each receiver is measured the electric or magnetic response signal of subsurface material to each frequency excitation electric current simultaneously, and therefrom extracts underground apparent resistivity information.
2. the three-dimensional three-dimensional artificial source's electromagnetic exploration method changing of measurement subsurface resistivity according to claim 1, it is characterized in that, on whole surveys line of institute's survey area, measuring point, arrange the collecting electrode or the magnetic probe that equate with measuring point number, and the electromagnetic signal receiver equating with measuring point number, measure the electromagnetic response on whole measuring points simultaneously.
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| CN103605154B (en) * | 2013-11-06 | 2016-04-06 | 中国石油集团东方地球物理勘探有限责任公司 | A kind of vibroseis frequency division exciting method simultaneously |
| CN103869371B (en) * | 2014-03-28 | 2017-02-15 | 吉林大学 | Manual field source frequency domain full-gradient electromagnetic measuring method |
| CN104407386B (en) * | 2014-12-05 | 2017-03-08 | 中国石油天然气集团公司 | A kind of electromagnetic survey data collection and processing method and system |
| CN105911595A (en) * | 2016-02-02 | 2016-08-31 | 中国科学院地质与地球物理研究所 | Method and apparatus for obtaining controllable source audio-frequency magnetotelluric (CSAMT) apparent phase information |
| CN106842334A (en) * | 2016-12-12 | 2017-06-13 | 中国石油天然气集团公司 | A kind of electromagnetic exploration method and device |
| CN107219558B (en) * | 2017-08-08 | 2023-07-14 | 山东省煤田地质规划勘察研究院 | Rapid electrode layout device and method for geophysical prospecting measurement |
| CN111208572A (en) * | 2020-02-28 | 2020-05-29 | 重庆慧勘工业技术研究院有限公司 | Multi-section dynamic imaging method and device based on mining transient electromagnetic instrument |
| CN115097531B (en) * | 2022-07-05 | 2023-05-19 | 中南大学 | Full-area observation alternating coverage integral differential mixed excitation full-information electromagnetic exploration method |
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