CN106646629A - Deepwater double-ship towing-type electromagnetic prospecting system - Google Patents
Deepwater double-ship towing-type electromagnetic prospecting system Download PDFInfo
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- CN106646629A CN106646629A CN201611118976.4A CN201611118976A CN106646629A CN 106646629 A CN106646629 A CN 106646629A CN 201611118976 A CN201611118976 A CN 201611118976A CN 106646629 A CN106646629 A CN 106646629A
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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
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses a deepwater double-ship towing-type electromagnetic prospecting system. The deepwater double-ship towing-type electromagnetic prospecting system comprises double work ships; the transmitting work ship is connected with a transmitter through a deep towing cable, and the transmitter is connected with a transmitting antenna and a trailer; the receiving work ship is connected in series with a plurality of acquisition stations through deep towing cables, the plurality of acquisition stations are connected through streamer cables, and the last acquisition station is connected with the trailer; each work ship is provided with a deck monitoring terminal, and communicates with underwater equipment through the deep towing cables and communication circuits, and supplies power to the underwater equipment, controls the underwater equipment and displays the state of the underwater equipment, and tows the underwater equipment to travel according to a predetermined route. According to the invention, a high-power transmitter is arranged close to the seabed for towing, several towing multi-component electromagnetic acquisition stations are additionally equipped, transmission and reception are respectively executed by the two ships, the distance between an emission source and an observation point, and the orientation of the emission source and the observation point can be changed discretionarily on the plane, transmission and reception are mixed in the time domain and the frequency domain, and the offshore operation efficiency, the detection depth and the lateral resolution are all improved.
Description
Technical field
The present invention relates to seabed medium electrical structure field of detecting, more particularly to a kind of double ship pull-type electromagnetic surveies of deep water
System.
Background technology
In nature, with certain reservoir space and making what the fluid for preserving wherein flowed under certain pressure reduction
Rock is referred to as reservoir rock.The stratum being made up of reservoir rock is referred to as reservoir, abbreviation reservoir.Can prevent in reservoir oil gas to
It is front to continue to migrate and store wherein a kind of place for gathering together, referred to as trap or reservoir hydrocarbon trap.
Marine Electromagnetic Approach be by sea or ocean floor topographic survey manually transmitting or natural generation magnetic distribution rule, visit
The geologic structure surveyed below seabed, or for the geophysical method of oceanographic research.Including seabed controllable source electromagnetic method, seabed
Telluric electromagnetic sounding, ocean dc resistivity etc..
Marine Electromagnetic Approach is one of key technology of submarine oil resources detection, is current International Geophysical electromagnetism circle research
Forward position and focus, in recent years, marine electromagnetic technology have developed rapidly in the world, achieve substantially in submarine oil resources detection
Application effect.Such as three wells are made a call in seabed, originally possible only one of which well has oil gas, and two other is dry-well,
After possessing this technology, can be avoided that by detection and two dry wells are drilled, so be possible to save hundreds of millions of
Fund.Marine oil and gas resource is day by day important, and now hundred million yuan at least of the investment of each marine oil and gas wellbore test, at most tens of
Hundred million, once the cost that exploration error is wasted is huge.After grasping Marine Electromagnetic Approach, it is possible to carry gas and oil in sea success rate
Double.
Seabed controllable source electromagnetic method（Marine CSEM, MCSEM）It is using controllable artificial field source transmitting electricity in seabed
Magnetic signal, and mutually orthogonal electric field and magnetic field are measured where away from field source, calculates apparent resistivity, with detect seabed with
The method of lower medium Electrical distribution.
Theoretical foundation of the seabed controllable source electromagnetic method in deepwater petroleum exploration field is that reservoir is electrical with surrounding medium
Difference.As the main flow exploration means of sea-bottom oil-gas --- seismic method faces to be sent out in regional seismic waves such as carbonate, igneous rock
Penetrate not substantially, trap inside is difficult to judgement be oil be many difficult problems such as water.And MCSEM provides target resistivity parameter and improves
Target resolution, reduces drilling dry-well rate, promotes the method fast-developing in recent years.
Since 2000, MCSEM makes up disappearance of the natural field source method in superficial part by high-power artificial excitation source, success
The hydrate and deep water hydrocarbon investigation of seabed superficial part is applied to, there is U.S. SIO in main research institution of representative foreign countries, moves
Prestige EMGS, Southampton, Britain university, but the method is limited to receiver quantity, there is that operating efficiency is low, lateral resolution
Low deficiency.
Contemporaneity is proposed seabed TDEM methods in University of Toronto, the main research institution of the method have plus
Put on airs University of Toronto, Germany BGR, Germany GEOMAR.The method carries out the research of time-domain EM method and technology by coupled device,
For the first time electromagnetic method is applied into hydrate investigation in Cascadia marine sites, the method transceiver, towing walk boat, operation effect
Rate is high, but longitudinal frame is low, investigation depth is shallow, it is difficult to meet deepwater petroleum exploration demand.
In recent years, Univ Edinburgh UK was proposed MTEM methods, similar to offshore earthquake streamer technologies, in emission source
Followed by a multichannel electric field reception cable, multi-fold, and coded excitation is carried out to high-power grounded source, the method it is excellent
Gesture is operation on the sea efficiency high, high resolution, subsequently under the promotion of PGS companies of Norway, has been carried out in a large number in the Branchian Sea
3 D electromagnetic seismic exploration, due to high-power emission source, to sink to the water surface shallower, is subject to a fixed limit during operation in profundal zone
System.
In its newest surveying tasks, observation procedure launches towed body tail to SIO similar to PGS towing cable schemes at it
Portion has linked several three axles electric field reception machines, it is intended to overcome the shortcomings of that MCSEM method lateral resolutions are low, operating efficiency is low.
Domestic aspect, China University of Geosciences（Beijing）From the phase at the end of the nineties in last century, joint is domestic under 863 Program support
Central South University, Jilin University, Guangzhou Marine Geological Survey Bureau carry out domestic seabed MT technique studies first, have developed first Taiwan Straits bottom
MT receivers, have carried out sea MT tests first；Then China University of Geosciences（Beijing）Carry out the method skill of ocean CSEM first
Art research, have developed First ocean CSEM emitters, first pull-type electric field reception machine, carry out ocean CSEM examinations first
Test.Up to now, China University of Geosciences（Beijing）Under the joint funding of China Geological Survey Bureau and 863 Program, face is defined
To hydrate investigation and operation on the sea method, the hardware equipped of deepwater petroleum exploration（4 emitters, 30 set receivers）, number
According to process, inversion interpretation marine CSEM survey system, total about 60 erect-positions, 150km survey line job tasks, defined
Hydrate marine investigation productivity.
In sum, current Marine Electromagnetic Approach is still high operating efficiency, big detection in the developing direction of deepwater petroleum exploration
Depth, high-resolution.Compared with the controllable source electromagnetic method of frequency domain ocean, time-domain marine electromagnetic can effectively suppress the shadow of air wave
Ring, with larger development potentiality.
At present the existing method and technology of international counterparts still suffers from deficiency, it is therefore necessary to propose the method and technology of innovation.
The content of the invention
In order to overcome the shortcomings of existing Marine Electromagnetic Approach in terms of deepwater petroleum exploration, it is double that the present invention provides a kind of deep water
Ship pull-type electromagnetic prospecting system, while high-power transmitter is placed near Sea Bottom towing by it, increases and matches somebody with somebody some towing multi -components
Electromagnetism acquisition station, transmitting is received and each performed by two ships, and emission source in the plane can be any with the distance of observation station, orientation
Change, time-domain frequency domain mixing transmitting is received, and at sea operating efficiency, investigation depth, lateral resolution aspect are changed
It is kind.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of double ship pull-type electromagnetic prospecting systems of deep water of the present invention, the system includes Launch Operation ship and reception operation ship,
Distance, the orientation of two operation ships can arbitrarily change on sea level；Launch Operation ship connects emitter, institute by deep towing cable
State emitter and be connected with transmitting antenna and tail tag；Launch Operation ship is provided with deck monitoring of emission end, by deep towing cable and communication
Circuit and emitter communication, power supply, power supply are provided to emitter, emitter is controlled, status display, towing emitter is pressed
Advance according to predetermined route；Operation ship is received by deep towing cable series winding multiple stage acquisition station, by waiting floating cable between multiple stage acquisition station
Connection, last acquisition station is connected with tail tag；Receive operation ship be provided with deck receive monitoring client, by deep towing cable, etc. it is floating
Cable and communicating circuit and each acquisition station communicate, provide power supply to each acquisition station, power to each acquisition station, and each acquisition station is controlled
System, status display, pull each acquisition station and advance according to predetermined route；Deep towing cable and grade floating cable realize power Transmission and operation ship
Deck end communicates with underwater installation；Acquisition station completes multicomponent data processing collection, storage, data and instruction transfer function；Tail tag reality
The existing fluid stability and Underwater Navigation of whole underwater installation.
Every acquisition station is provided with towed body, and the towed body is carrying platform；Integrated collection cabin, electrode group, magnetic on towed body
Open gate sensor, altimeter, localizer beacon, multiple buoyancy aids and wait floating cable；Control circuit, the control electricity are provided with collection cabin
Road respectively with electrode group, fluxgate sensor, altimeter and wait floating cable to electrically connect, the high accuracy for realizing each sensor signal is adopted
Collection, storage, transmission；The electrode group by 6 electrodes constitute three axle crossed electrodes to, realize three-component Ex, Ey, Ez electric field survey
Amount；Fluxgate sensor completes orthogonal Ex, Ey, Ez three-component magnetic-field measurement of three axles；Altimeter is used to obtain towed body from bottom height
Data；Localizer beacon realizes the Underwater Navigation of towed body, can obtain towed body exact position；Buoyancy aid provides buoyancy for acquisition station so that
Acquisition station buoyancy is neutrality；Multiple stage acquisition station is linked Deng floating cable, is realized the traction between multiple stage acquisition station, power supply and is communicated.
Collection cabin inner control circuit is by communicating circuit, electric power management circuit, lithium battery group, preamplifier, Acquisition Circuit
With local SD card composition；
Acquisition Circuit connects respectively with communicating circuit, fluxgate sensor and altimeter, and by preamplifier connection electrode
Group, preamplifier carries out low noise amplification, then three with three axis fluxgate sensors to the three-component electric field signal of electrode group
Component magnetic field signal delivers to together Acquisition Circuit；Acquisition Circuit gathers three-component electric field signal and three-component field signal, and connects
Altitude information is received, is sent to upper level acquisition station until deck monitoring client by communicating circuit after packing；Data storage is to local
In SD card；Communicating circuit is connected by electric power management circuit and lithium battery group, is realized the communication between each acquisition station, is adopted front end
The network packet distribution of collection station, sends to Acquisition Circuit and next acquisition station；Electric power management circuit connects lithium battery group or 24V
Power supply, realizes the 24V needed for the 48V DC voltages to each module in deep towing cable and 12V conversions.
Include polyester shell, Kev drawstring, two pairs of pair cable lines and a pair of power lines from the outside to the core Deng floating cable, outside polyester
Glass microballoon buoyancy aid is filled between shell and Kev drawstring, screen layer, Kev drawstring and are provided with outside two pairs of pair cable lines
To being filled with filler between power line and screen layer；Polyester shell has preferable corrosion-resistant, antiwear characteristic；Glass microballoon is floated
Body provides buoyancy to wait floating cable；Kev drawstring provides tractive force to wait floating cable；Filler isolates two pairs of pair cable lines and a pair
Power line；Screen layer provides electromagnetic shielding for the pair cable line of internal communication；Two pairs of pair cable lines realize data transfer, one
Direct current 48V power transmissions are realized to power line.
Electrode is AgCl material electrodes, and volume is about φ 1cm × 20cm, background noise 1nV/rt (Hz)@1Hz, with low
The characteristics of noise, small size.
Fluxgate magnetic sensor, volume is about φ 3.2cm × 25cm, background noise 6pT/rt (Hz)@1Hz, with low noise
The characteristics of sound small size.
Localizer beacon is USBL beacons, and under water weight is 3kg, and volume is about φ 10cm × 40cm, with positioning precision it is high,
The characteristics of bottom time length, small size.
Buoyancy aid for glass microballoon material floating body material, submerged density 0.5g/cm3, filled out according to towed body interior layout
Fill.Buoyancy aid is located at the top of towed body so that overall centre of buoyancy is upwards.
Collection cabin is processed using 7075 aluminium bars, external diameter 8cm, foreign minister 66cm, built-in electronic part, and two ends are provided with water
Cipher telegram cable, is connected with chain cable.Positioned at the bottom of towed body so that overall center of gravity is downward.
Towed body is processed using nylon material, and nylon material has excellent anticorrosive, low-temperature resistance, toughness, mechanical strength.Outward
See and be presented streamlined, with preferable underwater fluid stability.It is fixedly connected using glass reinforced plastic pipe between electrode and towed body so as to
Keep attitude relatively stable.
While high-power transmitter is placed near Sea Bottom towing by the present invention, increase with some towing multi -components electromagnetism collections
Stand, transmitting is received and each performed by two ships, and emission source can arbitrarily change in the plane with distance, the orientation of observation station, when
Between the mixing transmitting of domain frequency domain receive, at sea operating efficiency, investigation depth, lateral resolution aspect are improved.
Acquisition station works near Sea Bottom, high precision collecting electromagnetic field signal.It is orthogonal that separate unit acquisition station observes respectively three-component
Electric field, three-component field signal.Multiple acquisition stations are constituted a string, dynamic towing Collecting operation can be with the component of simultaneous observation 6
Electricity, magnetic signal, with the advantage more than operation on the sea efficiency high, high accuracy, component.Workboat is generally operational in 2-3 sections, according to pre-
Fixed survey line is advanced, and target area is reconnoitred in detail, finds out the following medium electrical structure in seabed.Acquisition station synchronous recording is dragged
Correct in body three-axis attitude, the orientation for data.Acquisition station is provided with USBL localizer beacons, real-time tracking acquisition station position under water
Put.It is of the invention mutually than ever achievement in research there are multi -components, sea rapidly and efficiently to reconnoitre, small size, Underwater Navigation high precision
Feature；Instrument has very low background noise, and electric field is 0.1nV/m/rt (Hz)@1Hz, and magnetic field is 6pT/rt (Hz)@1Hz, is fitted
With military purposes such as sea-bottom oil-gas, hydrate detection, and the monitorings of undersea ship leakage electromagnetic field.
Description of the drawings
Fig. 1 is the double ship pull-type electromagnetic prospecting system schematic diagrames of deep water of the present invention；
Fig. 2 is acquisition station theory diagram of the present invention；
Fig. 3 is to gather the control circuit theory diagram arranged in cabin；
Fig. 4 is the floating cable cross-sectional views such as the present invention.
Specific embodiment
As shown in figure 1, in Fig. 1,10 is sea, and 20 is seawater, and 30 is seabed, and 40 is sedimentary, and 50 is target reservoir.
As shown in figure 1, a kind of double ship pull-type electromagnetic prospecting system of deep water of the invention, the system includes Launch Operation ship
101 and receive operation ship 102, distance, the orientation of two operation ships can arbitrarily change on sea level；Launch Operation ship passes through
Deep towing cable 1 connects emitter 2, and the emitter is connected with transmitting antenna 3 and tail tag 4；Launch Operation ship is provided with deck transmitting
Monitoring client, power supply, power supply are provided by deep towing cable and communicating circuit and emitter communication, to emitter, emitter is controlled
System, status display, pull emitter and advance according to predetermined route；Operation ship is received by the deep series winding of towing cable 1 multiple stage acquisition station
5, pass through to wait floating cable 6 to connect between multiple stage acquisition station, last acquisition station is connected with tail tag 4；Receive operation ship and be provided with first
Plate receive monitoring client, by deep towing cable, etc. floating cable and communicating circuit and the communication of each acquisition station, provide to each acquisition station power supply, to
Each acquisition station is powered, and each acquisition station is controlled, status display, is pulled each acquisition station and is advanced according to predetermined route；Drag deeply
Cable and etc. floating cable realize that power Transmission and operation boat deck end communicate with underwater installation；Acquisition station complete multicomponent data processing collection,
Storage, data and instruction transfer function；Tail tag realizes the fluid stability and Underwater Navigation of whole underwater installation.
As shown in Fig. 2 every acquisition station is provided with towed body 5-1, the towed body is carrying platform；Integrated collection on towed body
Cabin 5-2, electrode group 5-3, fluxgate sensor 5-4, altimeter 5-5, localizer beacon 5-6, multiple buoyancy aid 5-7 and wait floating cable 6；Adopt
Collection is provided with control circuit in cabin, the control circuit respectively with electrode group, fluxgate sensor, altimeter and wait floating cable to be electrically connected
High precision collecting, storage, the transmission connect, realized each sensor signal；The electrode group constitutes three axle crossed electrodes by 6 electrodes
To, realize three-component Ex, Ey, Ez electric field measurement；Fluxgate sensor completes orthogonal Ex, Ey, Ez three-component magnetic-field measurement of three axles；
Altimeter is used to obtain towed body from bottom altitude information；Localizer beacon realizes the Underwater Navigation of towed body, can obtain towed body exact position；
Buoyancy aid provides buoyancy for acquisition station so that acquisition station buoyancy is neutrality；Multiple stage acquisition station is linked Deng floating cable, realizes that multiple stage is gathered
Traction, power supply and communication between standing.
Electrode is AgCl material electrodes, and volume is about φ 1cm × 20cm, background noise 1nV/rt (Hz)@1Hz, with low
The characteristics of noise, small size.
Fluxgate magnetic sensor, volume is about φ 3.2cm × 25cm, background noise 6pT/rt (Hz)@1Hz, with low noise
The characteristics of sound small size.
Localizer beacon is USBL beacons, and under water weight is 3kg, and volume is about φ 10cm × 40cm, with positioning precision it is high,
The characteristics of bottom time length, small size.
Buoyancy aid for glass microballoon material floating body material, submerged density 0.5g/cm3, filled out according to towed body interior layout
Fill.Buoyancy aid is located at the top of towed body so that overall centre of buoyancy is upwards.
Collection cabin is processed using 7075 aluminium bars, external diameter 8cm, foreign minister 66cm, built-in electronic part, and two ends are provided with water
Cipher telegram cable, is connected with chain cable.Positioned at the bottom of towed body so that integral central is downward.
Towed body is processed using nylon material, and nylon material has excellent anticorrosive, low-temperature resistance, toughness, mechanical strength.Outward
See and be presented streamlined, with preferable underwater fluid stability.It is fixedly connected using glass reinforced plastic pipe between electrode and towed body so as to
Keep attitude relatively stable.
Collection cabin inner control circuit is by communicating circuit, electric power management circuit, lithium battery group, preamplifier, Acquisition Circuit
With local SD card composition.
As shown in figure 3, Acquisition Circuit connects respectively with communicating circuit, fluxgate sensor, altimeter and localizer beacon, and
By preamplifier connection electrode group, preamplifier carries out low noise amplification to the three-component electric field signal of electrode group, then
Acquisition Circuit is delivered to together with the three-component field signal of three axis fluxgate sensors；Acquisition Circuit gathers three-component electric field signal
With three-component field signal, and the Underwater Navigation data of altitude information, localizer beacon are received, sent by communicating circuit after packing
To upper level acquisition station until deck monitoring client；In being locally stored to local SD card；Communicating circuit by electric power management circuit and
Lithium battery group connects, and realizes the communication between each acquisition station, distributes front-end collection station network packet, sends to Acquisition Circuit
And next acquisition station；Electric power management circuit connects lithium battery group or 24V power supplys, realize 48V DC voltages in deep towing cable to
24V and 12V conversion needed for each module.
As shown in figure 4, waiting floating cable to include polyester shell 6-1, Kev drawstring 6-2, two couples of pair cable line 6-3 from the outside to the core
With a pair of power line 6-4, glass microballoon buoyancy aid 6-5 is filled between polyester shell and Kev drawstring, outside two pairs of pair cable lines
Screen layer 6-6 is provided with, filler 6-7 is provided between Kev drawstring and a pair of power lines and screen layer；Polyester shell has
Preferable corrosion-resistant, antiwear characteristic；Glass microballoon buoyancy aid provides buoyancy to wait floating cable；Kev drawstring provides traction to wait floating cable
Power；Filler isolates two pairs of pair cable lines and a pair of power lines；Screen layer provides electromagnetism for the pair cable line of internal communication
Shielding；Two pairs of pair cable lines realize data transfer, and a pair of power lines realize direct current 48V power transmissions.
Induction type magnetic replacing sensor is fluxgate sensor by the present invention, eliminates glass marble, cement block, galvano-cautery knot
Structure and acoustic releaser, and increased Underwater Navigation.Above measure realizes that underwater towing electromagnetic data is gathered, and improves marine work
Industry efficiency, saves operation on the sea cost.Can realize that controllable source electromagnetic signal is observed, meet the ground such as submarine oil resources detection
The military use such as ball physical study demand and the monitoring of undersea ship leakage electromagnetic field.
Referring back to Fig. 1, the double ship pull-type electromagnetic prospecting system operations on the sea of deep water of the present invention comprise the steps：
1st, reach formulate marine site work area point position before, by host computer to gather cabin in control circuit carry out GPS to clock, set
Put acquisition parameter, inquire about working condition in cabin, confirm temperature, lock pressure, memory space, battery allowance, start collection, circuit prepares
Finish；
2nd, prepare to throw in, loop wheel machine transfers multiple stage acquisition station to the water surface, puts deep towing cable, and acquisition station free subsidence is long according to deep towing cable
Degree and the relation of the depth of water, less than Lift meter after 200m, by Underwater Navigation beacon monitor in real time towed body submarine site, by
Attitude transducer monitors towed body attitude；
3rd, acquisition station is reached after near Sea Bottom, and specific workflow is：Power up commands are initiated at deck end, inquire about each acquisition station state,
Collection is opened after acknowledgement state, multi-channel data background is preserved and sent to deck monitoring client by deep towing cable by acquisition station；
4th, in data acquisition, Shipborne terminal can understand acquisition station current by obtaining working condition and signal waveform in real time
The information such as collection progress, attitude information, battery electric quantity.Towed body real time position can be obtained by subsea beacon.
5th, operation ship towing acquisition station is advanced according to set route, after route collection in all survey areas is finished, deck prison
Control end initiates to stop acquisition, power-off, and winch receives deep towing cable.
When the 6th, salvaging acquisition station, acquisition station is salvaged to deck by boat-carrying loop wheel machine, packs up measurement arm, be fixed on deck,
Fresh water cleans acquisition station appearance seawater, and acquisition station is entered resting state by host computer by Ethernet downloading data, GPS to clock；
7th, by analyzing and processing initial data, the medium for obtaining underground is electrically imaged, so as to infer the mineral resources of tested region
Distribution, or the undersea ship leakage electromagnetic field signal for noting abnormalities.
Of the invention the characteristics of, has：
A) towed body Integrated electrode, fluxgate sensor, Acquisition Circuit are adopted；
B) three axial electrodes and three axis fluxgate sensors realize 6 component electromagnetic signals collectings；
C) integrated altimeter, Underwater Navigation, attitude transducer, realize motion state effective control；
D) integrated communication circuit, power circuit, Acquisition Circuit, preamplifier, lithium battery group etc.；
E) integrated multichain cable, that realizes some component datas of multiple stage acquisition station is uploaded in real time deck end；
The integrated two pairs of twisted-pair feeders of floating cable and a pair of power lines such as f), two pairs of twisted-pair feeders realize data transfer, and a pair of power lines are realized
Direct current 48V power transmissions.
Invention achieves following technical indicator：
Frequency range：DC-100Hz；
Include six circuit-switched data acquisition channels in measuring circuit, wherein gathering level respectively with vertical mutually orthogonal three roads electricity
（Ex、Ey、Ez）, orthogonal three-axle magnetic field（Bx、By、Bz）；
Full frequency band is using 24 Analog-digital Converters of high accuracy at high speed；
Realize different sample rate switchings（Two grades of 2400Hz, 150Hz）；
Using 32 Embedded ARM9 control chips, intelligent automatic operation, record and storage are realized；
Channel measurement dynamic range：120dB；
Background noise：Electric field is less than 0.1nV/m/rt (Hz)@1Hz；Magnetic field is less than 6pT/rt (Hz)@1Hz
Memory space：More than 32GB；
Clock stability：Better than 1ms/day；
Electric-field sensor：Ag/AgCl electrodes；
Magnetic field sensor：Fluxgate sensor；
Auxiliary information is measured：Azimuth, roll angle, the angle of pitch, temperature, battery electric quantity, Underwater Navigation, from bottom height etc. parameter；
Whole machine stream time：More than 24 hours；
Maximum operating water depth：2000m；
Volume：Main body frame is 30*30*100cm；
Weight：Air：30kg, in water：2kg；
As meeting technical requirements of the ocean controllable source electromagnetic method to weak signal extraction-obtain width under deep water towing environment
Artificial field source electromagnetic signal of the value in N × nV～N × 100mV scopes, frequency band in the range of DC～100Hz, and in view of sea
The factors such as reliability, ease for use, operation on the sea efficiency, noise, dynamic range, the bandwidth of bottom scope, devise a kind of use
The device of observation electromagnetic field, i.e. deep water pull-type multi -components multichain cable acquisition station are pulled near Sea Bottom.
Double depth water towing electromagnetic prospecting systems are there is presently no, it be also only single ship to have.It is existing it is ripe be towing transmitting,
Static reception, this operating type acquisition station limited amount, lateral resolution is reduced, and operating efficiency is limited.Double ships of the present invention
The advantage for being different from single ship towing system can be achieved on change transmitting-receiving away from the spatial position variable between two ships of transmitting-receiving is realized
The change in location of emission source and reception device, so as to realize various observed patterns, operating flexibility, investigation depth, efficiency have
It is substantially improved.
Steady operation of the present invention mainly realizes the stability of machinery, the main fluid stability including towed body（Can not be in water
Lower upset）, multiple stage reception device tensile property；The stability of circuit, the main reliability design for including circuit hardware,
Design of Reliability etc..Electrode is to realize that electric field signal is observed by sea water ion exchange, must stretch in acquisition station
There is a certain distance between outside, and electrode.
High-resolution of the present invention is mainly the low-noise characteristic of electromagnetic field observation, is embodied in low noise sonic transducer, low noise
Amplifier, low noise Acquisition Circuit aspect.Orthogonal three axle mainly realizes that multi -components are observed, and compares single shaft information content more rich.
Lateral resolution is limited to the quantity of static acquisition station, and drag operation realizes dynamic towing observation, laterally observation
Point is significantly increased, and improves lateral resolution.
While high power transmitter is placed near Sea Bottom towing by double depth water towing electromagnetic prospecting systems of the invention, increasing is matched somebody with somebody
Some towing multi -components electromagnetism acquisition stations, transmitting is received and each performed by two ships, and the distance of emission source and observation station, orientation exist
Can arbitrarily change in plane, the mixing transmitting of time-domain frequency domain is received, at sea operating efficiency, laterally investigation depth, resolution
Rate aspect is improved.
The present invention links together multiple acquisition stations, and the towing of multiple stage acquisition station is advanced by workboat.Acquisition station works
With near Sea Bottom, high precision collecting electromagnetic field signal.Separate unit acquisition station observation three-component orthogonal electric field, three-component field signal.Will
Multiple acquisition stations are constituted a string, dynamic towing Collecting operation, can be with the component electromagnetic signal of simultaneous observation 6, with operation on the sea effect
Advantage more than rate height, high accuracy, component.Workboat is generally operational in 2-3 sections, advances according to predetermined survey line, to target area
Reconnoitred in detail, found out the following medium electrical structure in seabed.The acquisition station synchronous recording towed body three-axis attitude, for data
Correct in orientation.The acquisition station is provided with USBL localizer beacons, real-time tracking acquisition station submarine site.It is of the invention mutually to study than ever
Achievement have multi -components, sea rapidly and efficiently reconnoitre, small size, Underwater Navigation high precision the characteristics of；Instrument has very low sheet
Back noise, electric field is 0.1nV/m/rt (Hz)@1Hz, and magnetic field is 6pT/rt (Hz)@1Hz, is suitable for sea-bottom oil-gas, hydrate detection,
And undersea ship leakage electromagnetic field monitor etc. military purposes.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and and
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need to be exhaustive to all of embodiment.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (5)
1. the double ship pull-type electromagnetic prospecting system of a kind of deep water, it is characterised in that：The system includes Launch Operation ship and reception
Operation ship, distance, the orientation of two operation ships can arbitrarily change on sea level；Launch Operation ship is sent out by deep towing cable connection
Machine is penetrated, the emitter is connected with transmitting antenna and tail tag；Launch Operation ship is provided with deck monitoring of emission end, by deep towing cable
And communicating circuit and emitter communicate, power supply, power supply are provided to emitter, and emitter is controlled, status display, towing is sent out
Penetrate machine to advance according to predetermined route；Operation ship is received by deep towing cable series winding multiple stage acquisition station, is passed through between multiple stage acquisition station
Deng floating cable connection, last acquisition station is connected with tail tag；Receive operation ship to be provided with deck reception monitoring client, drag by deep
Cable, etc. floating cable and communicating circuit and the communication of each acquisition station, provide power supply to each acquisition station, power to each acquisition station, to each collection
Station is controlled, status display, pulls each acquisition station and advances according to predetermined route；Deep towing cable and grade floating cable realize power Transmission
And operation boat deck end communicates with underwater installation；Acquisition station completes multicomponent data processing collection, storage, data and instruction transmission work(
Energy；Tail tag realizes the fluid stability and Underwater Navigation of whole underwater installation.
2. the double ship pull-type electromagnetic prospecting system of deep water as claimed in claim 1, it is characterised in that：Every acquisition station is respectively provided with
There is towed body, the towed body is carrying platform；Integrated collection cabin, electrode group, fluxgate sensor, altimeter, positioning letter on towed body
Mark, multiple buoyancy aids and wait floating cable；Control circuit is provided with collection cabin, the control circuit is passed respectively with electrode group, fluxgate
Sensor, altimeter and the high precision collecting, storage, the transmission that wait floating cable electrical connection, realize each sensor signal；The electrode group by
6 electrodes constitute three axle crossed electrodes to, realize three-component Ex, Ey, Ez electric field measurement；It is orthogonal that fluxgate sensor completes three axles
Ex, Ey, Ez three-component magnetic-field measurement；Altimeter is used to obtain towed body from bottom altitude information；Localizer beacon realizes towed body under water
Positioning, can obtain towed body exact position；Buoyancy aid provides buoyancy for acquisition station so that acquisition station buoyancy is neutrality；To be many Deng floating cable
Platform acquisition station is linked, and is realized the traction between multiple stage acquisition station, power supply and is communicated.
3. the double ship pull-type electromagnetic prospecting system of deep water as claimed in claim 2, it is characterised in that：Collection cabin inner control circuit
It is made up of communicating circuit, electric power management circuit, lithium battery group, preamplifier, Acquisition Circuit and local SD card；
Acquisition Circuit connects respectively with communicating circuit, fluxgate sensor and altimeter, and by preamplifier connection electrode
Group, preamplifier carries out low noise amplification, then three with three axis fluxgate sensors to the three-component electric field signal of electrode group
Component magnetic field signal delivers to together Acquisition Circuit；Acquisition Circuit gathers three-component electric field signal and three-component field signal, and connects
Altitude information is received, is sent to upper level acquisition station until deck monitoring client by communicating circuit after packing；Data storage is to local
In SD card；Communicating circuit is connected by electric power management circuit and lithium battery group, is realized the communication between each acquisition station, is adopted front end
The network packet distribution of collection station, sends to Acquisition Circuit and next acquisition station；Electric power management circuit connects lithium battery group or 24V
Power supply, realizes the 24V needed for the 48V DC voltages to each module in deep towing cable and 12V conversions.
4. the double ship pull-type electromagnetic prospecting system of deep water as claimed in claim 3, it is characterised in that：Wrap from the outside to the core Deng floating cable
Polyester shell, Kev drawstring, two pairs of pair cable lines and a pair of power lines are included, glass is filled between polyester shell and Kev drawstring
Glass microballon buoyancy aid, is provided with screen layer outside two pairs of pair cable lines, fill between Kev drawstring and a pair of power lines and screen layer
There is filler；Polyester shell has preferable corrosion-resistant, antiwear characteristic；Glass microballoon buoyancy aid provides buoyancy to wait floating cable；Kev
Drawstring provides tractive force to wait floating cable；Filler isolates two pairs of pair cable lines and a pair of power lines；Screen layer is internal communication
Pair cable line provide electromagnetic shielding；Two pairs of pair cable lines realize data transfer, and a pair of power lines realize direct current 48V electric power
Transmission.
5. claim 1-4 it is arbitrary as described in the double ship pull-type electromagnetic prospecting system of deep water, it is characterised in that：Electrode is
AgCl material electrodes, volume is about φ 1cm × 20cm, background noise 1nV/rt (Hz)@1Hz；
Fluxgate magnetic sensor volume is about φ 3.2cm × 25cm, background noise 6pT/rt (Hz)@1Hz；
Localizer beacon is USBL beacons, and under water weight is 3kg, and volume is about φ 10cm × 40cm；
Buoyancy aid for glass microballoon material floating body material, submerged density 0.5g/cm3, it is filled according to towed body interior layout；It is floating
Body is located at the top of towed body so that the overall centre of buoyancy of towed body is upwards；
Collection cabin is processed using 7075 aluminium bars, external diameter 8cm, foreign minister 66cm, built-in control circuit, and two ends are provided with watertight electricity
Cable, and deep towing cable or waits floating cable to be connected, positioned at the bottom of towed body so that the overall center of gravity of towed body is downward；
Towed body is processed using nylon material, and outward appearance is presented streamlined, is fixedly connected using glass reinforced plastic pipe between electrode and towed body, makes
It keeps attitude relatively stable.
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| CN201611118976.4A CN106646629A (en) | 2016-12-08 | 2016-12-08 | Deepwater double-ship towing-type electromagnetic prospecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611118976.4A CN106646629A (en) | 2016-12-08 | 2016-12-08 | Deepwater double-ship towing-type electromagnetic prospecting system |
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ID=58819989
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|---|---|---|---|
| CN201611118976.4A Pending CN106646629A (en) | 2016-12-08 | 2016-12-08 | Deepwater double-ship towing-type electromagnetic prospecting system |
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