CN109597132A - A kind of shallow sea magnetic source transient electromagnetic detection device and detection method - Google Patents
A kind of shallow sea magnetic source transient electromagnetic detection device and detection method Download PDFInfo
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- CN109597132A CN109597132A CN201811602135.XA CN201811602135A CN109597132A CN 109597132 A CN109597132 A CN 109597132A CN 201811602135 A CN201811602135 A CN 201811602135A CN 109597132 A CN109597132 A CN 109597132A
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- magnetic source
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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
- G01V3/10—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 using induction coils
Abstract
The invention discloses a kind of shallow sea magnetic source transient electromagnetic detection device and detection method, described device includes: the emission source and receiving module being fixed on a hard frame of rigidity jointly；The emission source is to pull or carry the magnetic source transmitting coil on unmanned machine under water using towboat；The receiving module, for receiving submarine target because of secondary inductive electromagnetic field signal caused by electromagnetic induction effect.The device of the invention is easy to operate and quick surface sweeping measurement may be implemented；Detection method of the invention is not necessarily to iteration, can be realized quick, the accurate detection of sub-sea floor targets.
Description
Technical field
The present invention relates to marine geophysical survey fields, more particularly to a kind of shallow sea magnetic source transient electrical magnetic spy
Survey device and detection method.
Background technique
Currently, the detection for seabed Small object is main since sound, magnetic signal have good propagation characteristic in water
Dependent on sonar and magnetic method Detection Techniques, and achieve good Effect on Detecting.However it is directed to shallow sea especially pole neritic area
Domain, since environmental condition is complicated and the application of new material, the above method have the disadvantage that the small target detection of (1) active service
Sonar majority uses high-frequency narrow-band signal to obtain the target imaging of high resolution, it is difficult to realize the spy to Small object is buried
It surveys and identifies；(2) shallow water along the coast ambient noise and bottom reverberation are serious, so that sonar is for seabed small target detection difficulty；
(3) for modern objective body by finishing and coating treatment, acoustic target signal is extremely faint, and traditional Acoustic detection instrument is simultaneously uncomfortable
For burying the detection and identification of target；(4) equipment has been used as using the target of non-magnetic material manufacture, has been detected using magnetic method
It is restricted.Therefore, it needs to introduce new technology as sound, effective supplement of magnetic technology, improves the detection and knowledge of underwater Small object
Other efficiency.
Ocean controllable source electromagnetic method (CSEM) uses artificial field source as emission source, to detect the difference of target electrical parameter
It is different basic for physical property, it can effectively reflect the electrical structure and spatial of subsea strata, be Sea area geologic survey, sea
One of the important geophysical method of foreign Exploration of Oil And Gas and Deep Sea Minerals detection.
Ocean controllable source electromagnetic method at this stage is mainly based on frequency domain (FCSEM) method, and working method is using towing
Mode is observed, and using the electric dipole source of horizontal/vertical as emission source, is played in marine oil and gas resource detection important
Effect.However the detection of objective body object is buried for shallow sea, this device haves the shortcomings that obvious: (1) due to using eelctric dipole
Source as emission source, the response of the anomalous body that receives be mainly distributed on big transmitting-receiving away from region in, bulk effect is obvious, differentiates
Rate is low；(2) the Small object body that shallow sea is buried generally is manufactured with metal material, is that highly conductive body is abnormal in electrical property, grounded source for
The resolution capability of high conductor is lower compared with magnetic source；(3) frequency domain electromagnetic methods are by air wave serious interference, especially in shallow sea water
Domain.
Summary of the invention
The present invention provides a kind of simple device, detection efficient and resolution ratio for above-mentioned deficiency present in the prior art
Means of interpretation that is high, coupling optimal shallow sea magnetic source time-domain electromagnetic exploration apparatus with objective body and its be mutually applicable in therewith, is used
To improve detection and the recognition efficiency that object is buried in shallow sea.
In order to achieve the above object, the invention proposes a kind of shallow sea magnetic source transient electromagnetic detection device, described devices
It include: the emission source and receiving module being fixed on a hard frame of rigidity jointly；The emission source be using towboat towing or
Carry the magnetic source transmitting coil on unmanned machine under water；The receiving module, for receiving submarine target because of electromagnetic induction
Secondary inductive electromagnetic field signal caused by effect.
As a kind of improvement of above-mentioned apparatus, the magnetic source transmitting coil be it is rectangular, side length value range be 2-
4m。
As a kind of improvement of above-mentioned apparatus, the magnetic source transmitting coil is circle, and radius is less than 5 meters.
As a kind of improvement of above-mentioned apparatus, the receiving module includes a receiving coil；For center loop line or three
Mutually orthogonal small coil.
As a kind of improvement of above-mentioned apparatus, the receiving coil is placed in the center of magnetic source transmitting coil.
Based on above-mentioned detection device, the present invention also provides a kind of shallow sea magnetic source transient electromagnetic detecting method, the sides
Method includes:
It is σ that step 1), which precomputes an apparent conductivity,0Transient response curve B0(σ0,a,tj), a is transmitting coil
Radius or side length, tjAt the time of for jth frame signal, tj∈[10-10,104]；
Step 2) draws a magnetic induction intensity curve B (σ according to the signal that receiving module obtainsi,a,ti)；Wherein, ti
At the time of for the i-th frame signal；σiFor apparent conductivity；
B (σ of the step 3) to any sampling instanti,a,ti), in time range [10-10,104] in find a point tk,
Meet B (ti)=B0(tk), then magnetic induction density B (σi,a,ti) the corresponding apparent resistivity ρ of curveiAre as follows:
Present invention has an advantage that
1, the present invention detects the burial objective body under the conditions of shallow sea using magnetic source transient electromagnetic method, work
Can be towboat towing as mode also can be used underwater unmanned machine and is carried, transmitting and receiving device one, operation letter
List and quick surface sweeping measurement may be implemented；
2, electromagnetic method has its unique advantages compared to sound, magnetic detection method, may be implemented to bury non magnetic target
Detection and the spatial information of objective body is provided；Compared to frequency domain controllable source method, the present invention is using magnetic source device to height
High resolution, the bulk effect of conductor are small, and time-domain method is not influenced in neritic province domain vulnerable to air wave, is further mentioned
High detection accuracy；
3, detection method of the invention can be realized quick, three-component shallow sea transient electromagnetic detecting, provide neritic environment
The detailed information of lower burial objective body；Since magnetic induction intensity curve exists between conductivity, measuring point coordinate and observation time
Flexible characte is translated, this property can be indicated by simple mathematical relationship, can solve correspondence in conjunction with translation curve
Apparent resistivity value；The mobile ratio fast algorithm of apparent resistivity is not necessarily to iteration, suitable to multi -components and non-central condition of acceptance
With having the advantages that fast and accurately.
Detailed description of the invention
Fig. 1 is the flow chart of detection method of the invention；
Fig. 2 (a) is that shallow sea transient electromagnetic detecting towboat pulls mode schematic device in the present invention；
Fig. 2 (b) is that shallow sea transient electromagnetic detecting underwater robot carries mode schematic device in the present invention；
Fig. 3 is transmitting coil and three-component receiving coil equipment schematic diagram in the present invention；
Fig. 4 is marine transient electromagnetic response curve comparison diagram under the influence of different transmitting frame radius situations；
Fig. 5 is shallow sea transient electromagnetic magnetic induction intensity curve graph in the case of different conductivity；
Fig. 6 (a) is that neritic environment buries Small object body three-dimensional geological model schematic diagram；
Fig. 6 (b) is threedimensional model top view and principal section arrangement of measuring-line figure；
Fig. 6 (c) is the road threedimensional model principal section vertical component magnetic induction intensity Duo Ce curve graph；
Fig. 6 (d) is threedimensional model principal section apparent resistivity curve cross-section diagram.
Specific embodiment
Further clear, complete description is done to the present invention below with reference to attached drawing, it is clear that described embodiment
It is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to what the present invention protected
Range.Additionally, protection scope of the present invention should not only be limited to following specific structures or component or design parameter.
As shown in Figure 1, overall technological scheme of the invention are as follows:
Emission source using small magnetic source (side length 2-4m) as shallow sea transient electromagnetic detection device utilizes towboat water
Orly drags or carries underwater unmanned robot (AUV/ROV) and carries out Continuous Profiling；
Data acquisition modes are selected according to detection purpose and required precision, using Genter loop reception or multiple small coils
Three-component reception pattern, to meet surface sweeping detection and pinpoint demand；
Construct the functional relation of seabed dielectric conductance rate and magnetic source Transient electromagnetic response；
Apparent resistivity definition is carried out to acquisition data using mobile ratio fast algorithm, quick qualitative solution is realized with this
It releases.
Referring to Fig. 2 (a), it is shown that shallow sea magnetic source transient electromagnetic detection device schematic diagram.As shown in Fig. 2 (b), sending out
In terms of penetrating source, it can use towboat towing or make rectangular (or round) loop line in such a way that underwater unmanned machine carries
For the emission source of shallow sea transient electromagnetic detecting, emission source has certain towing height to be detected apart from seabed.When using towboat
When towing mode, towboat and transmitting coil should keep certain effective distance, in order to avoid because towboat influences to generate unnecessary interference.
For reception device, it is acquired for neritic environment first choice using Genter loop mode, receiving coil is placed in
Transmitting coil center, and it can be fixed on jointly with transmitting coil on the hard frame of rigidity, make transmitting and receives as one
It is whole, guarantee the two relative motion posture to be suitble to subsea environment detection.Due to horizontal component for underground medium shape with
Location information reflection is more preferably more obvious than vertical component, therefore accurately detecting and positioning for Small object, Ying Caiyong three-component are seen
Survey mode, being capable of significantly more efficient determining abnormal electrical property and occurrence information by way of multi -components joint interpretation.Such as Fig. 3
It is shown three-component receiving coil schematic diagram, can realize that three-component is observed by the device.
Observation device dimensional parameters are designed, by taking annular emission loop line as an example, by the comparison of Fig. 4.It is transmitted back to
The main early stage numerical value for influencing transient response of the variation of linear dimension, transmitting loop radius is bigger, and response early stage amplitude reduces brighter
It shows and reversion occurs, increase its and explain difficulty；Later period response respectively emits dimension curve and reaches unanimity.Therefore, comprehensively consider sea
The simplicity that the convenience of bottom observation device and later period explain, seabed wire-retracting device size should not be too large, and should choose small-sized transmitting
Coil (radius < 5m or so) is detected；Certainly, if detection target buried depth is deeper, transmitting frame size should be increased suitably with suitable
The needs for answering deeper part to detect.
It carries out continuous intensive surface sweeping to the Small object body that shallow sea is buried using above-mentioned apparatus to detect, using quick view electricity
Resistance rate defines algorithm and carries out qualitative interpretation to observation data, and the specific method is as follows:
The three-component magnetic induction intensity signal received is expressed asWherein (p=x, y,
Z), apparent conductivity σ and apparent resistivity ρ are reciprocal each otherA is transmitting coil radius, fpIt (u) is normalized response kernel function,
Apparent resistivity ρ is the function about u, can be expressed as
It enables: σ*=K σ, t*=Kt.Wherein K is constant, then has:
By above-mentioned relation formula it is found that offset distance remains unchanged, extend by K times of conductivity variations, while by observation time
K times, the B observed is equal to the B of former transient response.
The method for calculating apparent resistivity using mobile ratio fast algorithm is specific as follows:
By simulation calculation obtain when it is sea water advanced be 10 meters when, vertical magnetic induction is strong in the case of different seafloor conductivities
Spend the change curve of response as shown in figure 5, it can thus be appreciated that there are mathematical relationship between different conductance profile, any bar in figure
Curve negotiating moves in parallel can be with another curve co-insides.Thus for magnetic induction intensity (or induced electromotive force) B
(σi,a,ti) curve, in order to seek corresponding to temporal apparent resistivity value, then can calculated in advance go out a conductivity be σ0Wink
Become response curve B0(σ0,a,tj) (example tj∈[10-10,104]), to the B (σ of any sampling instanti,a,ti), it can be in the time
Range [10-10,104] in find a point tk, meet B (ti)=B0(tk), then tiWith tkThe multiple differed on time is just
It is exactly the multiple of the difference of two curve resistance rates, thus can both finds out the apparent resistivity ρ of measured curvei.It is available corresponding
Measured curve apparent resistivity value are as follows:
Apparent resistivity value can be used for the identification of unlike material target.
The apparent resistivity definition method that the present invention provides is a kind of fast and efficiently computation of apparent resistivity method, this method
Without iteration, calculating speed is exceedingly fast and computational accuracy is high, be suitble to the processing of shallow sea transient electromagnetic surface sweeping observation mass data with
It explains.It is a kind of full-time domain, the total space, multicomponent means of interpretation that the resistivity, which defines method, is applicable not only to shallow sea detection
It is suitable for ground simultaneously and aerospace detection is explained.It is qualitative that the interpretation technique gives a kind of intuitive shallow sea transient electromagnetic detecting
Means of interpretation, while also information more abundant further is provided with 3-D interpretation for inverting from now on.In order to further test
The validity of proposed method is demonstrate,proved, the present invention devises the three-dimensional geological model that multiple objective bodies are buried under the conditions of shallow sea, selection
Center loop device calculates principal section observation data using given method.
Fig. 6 (a) is three-dimensional geological model stereoscopic schematic diagram, and Fig. 6 (b) is the top view and principal section arrangement of measuring-line of model
Figure；Wherein sea water advanced is 10m, conductivity 3S/m, and wherein Gray abnormity body is the underwater burial Small object model of simulation, ruler
Very little is 2m × 0.5m × 0.5m, buried depth 1m, conductivity 105S/m；The simulation of yellow anomalous body sinks to the bottom petrol drum, having a size of 1m ×
0.5m × 0.5m, conductivity 104S/m, petrol drum and burial Small object are at a distance of 1.5m；Surrounding sedimentary conductivity is 1S/m；
Using side length is the rectangular loop line of 3m as emission source (TX), is received along sea bottom surface, emission current 100A, and survey line is 9 meters long,
7 measuring points are arranged altogether.
The present invention has obtained the road the Duo Ce curve graph (Fig. 6 (c)) of principal section induced electromotive force using D integral pin-fin tube method,
And the apparent resistivity section diagram (Fig. 6 (d)) on principal section is obtained using apparent resistivity definition method.In apparent resistivity section diagram
Three low-resistance closed anomalous circles show respectively three low-resistance anomalous bodys in model, and its scale, electrical property and modelling
Unanimously.The above result shows that magnetic source transient electromagnetic method can accurately reflect electrical structure and the distribution of sub-sea floor targets body
Feature.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (6)
1. a kind of shallow sea magnetic source transient electromagnetic detection device, which is characterized in that described device includes: to be fixed on one jointly just
Emission source and receiving module on the hard frame of property；The emission source is to be pulled or carried on unmanned machine under water using towboat
Magnetic source transmitting coil；The receiving module, for receiving submarine target because of secondary induced electricity caused by electromagnetic induction effect
Magnetic field signal.
2. magnetic source transient electromagnetic detection device in shallow sea according to claim 1, which is characterized in that the magnetic source transmitting
Coil be it is rectangular, side length value range be 2-4m.
3. magnetic source transient electromagnetic detection device in shallow sea according to claim 1, which is characterized in that the magnetic source transmitting
Coil is circle, and radius is less than 5 meters.
4. magnetic source transient electromagnetic detection device in shallow sea according to claim 1, which is characterized in that the receiving module packet
Include a receiving coil；For center loop line or three mutually orthogonal small coils.
5. magnetic source transient electromagnetic detection device in shallow sea according to claim 4, which is characterized in that the receiving coil is put
It is placed in the center of magnetic source transmitting coil.
6. a kind of shallow sea magnetic source transient electromagnetic detecting method is realized, institute based on detection device described in one of claim 1-5
The method of stating includes:
It is σ that step 1), which precomputes an apparent conductivity,0Transient response curve B0(σ0,a,tj), a is the radius of transmitting coil
Or side length, tjAt the time of for jth frame signal, tj∈[10-10,104]；
Step 2) draws a magnetic induction intensity curve B (σ according to the signal that receiving module obtainsi,a,ti)；Wherein, a is transmitting
The radius or side length of coil, tiAt the time of for the i-th frame signal；σiFor apparent conductivity；
B (σ of the step 3) to any sampling instanti,a,ti), in time range [10-10,104] in find a point tk, meet B
(ti)=B0(tk), then magnetic induction density B (σi,a,ti) the corresponding apparent resistivity ρ of curveiAre as follows:
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Cited By (8)
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| CN109991669A (en) * | 2019-04-11 | 2019-07-09 | 河海大学 | A kind of underwater magnetic method detection system of unmanned boat towing |
| CN110261914A (en) * | 2019-05-23 | 2019-09-20 | 西安深维智能科技有限公司 | A kind of underwater electromagnetic detector in distinguishable orientation |
| CN110333539A (en) * | 2019-07-18 | 2019-10-15 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, chuck and pulling plate nondestructive detection system and method |
| CN110346839A (en) * | 2019-07-30 | 2019-10-18 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, pulling plate and chuck detection system and method |
| CN110376651A (en) * | 2019-06-20 | 2019-10-25 | 成都理工大学 | Time-frequency calutron and geophysical exploration method based on horizontal double pole current source |
| CN110717138A (en) * | 2019-09-12 | 2020-01-21 | 吉林大学 | Towed transient electromagnetic data preprocessing method |
| CN114137621A (en) * | 2021-10-25 | 2022-03-04 | 长安大学 | Method, system and medium for detecting hidden danger of dragging type dam |
| CN114518605A (en) * | 2022-03-30 | 2022-05-20 | 成都理工大学 | Low-altitude, shallow water and deep water integrated geological measurement method based on electromagnetic method |
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2018
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991669A (en) * | 2019-04-11 | 2019-07-09 | 河海大学 | A kind of underwater magnetic method detection system of unmanned boat towing |
| CN109991669B (en) * | 2019-04-11 | 2020-09-22 | 河海大学 | Unmanned ship towing underwater magnetic detection system |
| CN110261914A (en) * | 2019-05-23 | 2019-09-20 | 西安深维智能科技有限公司 | A kind of underwater electromagnetic detector in distinguishable orientation |
| CN110376651A (en) * | 2019-06-20 | 2019-10-25 | 成都理工大学 | Time-frequency calutron and geophysical exploration method based on horizontal double pole current source |
| CN110333539A (en) * | 2019-07-18 | 2019-10-15 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, chuck and pulling plate nondestructive detection system and method |
| CN110346839A (en) * | 2019-07-30 | 2019-10-18 | 海南电网有限责任公司白沙供电局 | A kind of power distribution network shaft tower chassis, pulling plate and chuck detection system and method |
| CN110717138A (en) * | 2019-09-12 | 2020-01-21 | 吉林大学 | Towed transient electromagnetic data preprocessing method |
| CN110717138B (en) * | 2019-09-12 | 2023-06-30 | 吉林大学 | Towed transient electromagnetic data preprocessing method |
| CN114137621A (en) * | 2021-10-25 | 2022-03-04 | 长安大学 | Method, system and medium for detecting hidden danger of dragging type dam |
| CN114137621B (en) * | 2021-10-25 | 2023-08-18 | 长安大学 | Method, system and medium for detecting hidden danger of trailing dam |
| CN114518605A (en) * | 2022-03-30 | 2022-05-20 | 成都理工大学 | Low-altitude, shallow water and deep water integrated geological measurement method based on electromagnetic method |
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