CN109975875A - A kind of received vertical-rise cable system for acquiring seismic data and method at random - Google Patents
A kind of received vertical-rise cable system for acquiring seismic data and method at random Download PDFInfo
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- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3843—Deployment of seismic devices, e.g. of streamers
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Abstract
The invention discloses a kind of random received vertical-rise cable system for acquiring seismic data and method, which includes sequentially connected fixation from the bottom to top and releasing section, power and active section, is straightened and positioning section；This method includes system configuration, system is laid, data acquire, system recycles and five steps of data processing.The present invention uses the technical solution that the hydrophone on reception channel is installed on random site, and certain hydrophone quantity can obtain longer vertical-rise cable length, improve Observable range, reduces research and development cost；Trail spacing seismic exploration effect may be implemented in the hydrophone of equal length, identical quantity, random site reception；The underwater posture of the adjustable cable of deep-sea small propeller is more advantageous to the seismic reflection signals for obtaining different target geologic body.Present system the operation is stable, flexibility are high, can connect multiple cable receiver sections according to different exploration targets, meet the deep-sea geology and mineral resources demand of different type and scale.
Description
Technical field
The present invention relates to oceanographic survey field, specifically a kind of random received vertical-rise cable system for acquiring seismic data and
Method.
Background technique
Marine Geology and Mineral Resource Survey are a basic and strategic investigative actions, wherein seismic detection method
It is played an important role in subbottom structure and Mineral Resource Survey.Conventional sponges pull earthquake apart from seabed distance farther out, letter
Reasons, the resolution ratio such as make an uproar relatively low can only generally meet the needs of shallow sea engineering exploration, be unable to satisfy deep-sea ocean high-resolution
The needs of detection.
In recent years, domestic and international vertical-rise cable earthquake (Vertical Cable Seismic, VCS) provide a kind of deep-sea and
Ocean high-resolution, a kind of means of high s/n ratio detection.But external vertical-rise cable generally with submarine earthquake (Ocean
Bottom Seismometer, OBS) connection use, also there are the vertical cable for being fixed on seabed for sulfide investigation, maximum work
Making the depth of water is 2000m.There are two main classes for domestic vertical-rise cable, independently can use or pull and uses, but is mainly used for coastal waters work
Journey reconnoitre with military target monitoring in.Current vertical cable is all the integrated cable design fixed using its length and road spacing
Mode causes the flexibility of equipment insufficient, receives limitation to the detection target adaptability of different size and scale, and break down
It is easy to cause whole cable that can not work.In addition, deep-sea ocean seismic survey is a sufficiently expensive scientific research and investigative action,
Operating area generally farther out (such as China focuses primarily upon south west Indian Ocean, the Atlantic Ocean, Pacific Ocean sea area at present), and deep-sea visit
Survey all has high requirement to the resistance to pressure and over all Integration of equipment, in addition its technical monopoly, equipment development difficulty is larger, cost
It is sufficiently expensive.The work pattern of a plurality of cable detection more exacerbates the cost of detected event.
It follows that though vertical cable has the advantages of high-resolution, high s/n ratio detection, the flexibility of equipment and cost at
Nevertheless suffer from vertical cable in seismic survey for the purpose of deep-sea ocean geological structure and Mineral Resource Survey greatly
Limitation.
Summary of the invention
Aiming at the shortcomings existing in the above problems, the present invention provides a kind of random received vertical-rise cable seismic data
Acquisition system and method.
To achieve the above object, on the one hand, the present invention provides a kind of random received vertical-rise cable earthquake data acquisition system
System, which includes sequentially connected fixation from the bottom to top and releasing section, power and active section, is straightened and positioning section；
The fixation and releasing section include by the sequentially connected weight anchor of Kev drawstring, with the acoustics release of distance measurement function
Device, pressure sensor and the first floating ball group；The weight anchor is used to system being fixed on seabed surface, and the acoustic releaser is used for
The recycling of completion system, the pressure sensor avoid down for recording pressure data, the first floating ball group for system to be straightened
Method, apparatus bottoms out；
The power and active section include power supply and control platform, data receiver cable and the second floating ball group；The data
It receives and the hydrophone for being responsible for record vibration signal and the posture instrument for being responsible for record position posture, hydrophone is installed in cable
Position in data receiver cable is random distribution；The power supply is with control platform for completing system power supply and system control
Work processed installs the second floating ball group above power supply and control platform；
Described be straightened with positioning section includes that the acoustics for determining point position connected using Kev drawstring is answered
Device and the third floating ball group for whole system to be straightened are answered, the third floating ball group is located at the top of whole system.
Further, in the fixation and releasing section, the acoustic releaser with distance measurement function uses two sets of equipment groups
Work is closed, the reliability of system release is improved, is connected between the release hook of two releases by steel chain, and steel chain passes through steel
Ring, steel loop connect weight anchor by Kev drawstring.
Further, in the power and active section, the distribution of the hydrophone is carried out using segmentation stochastic sampling strategy
Design；The segmentation of data receiver cable connects, and practical organize is attached in cable using multiple subsegments；If hydrophone number
For n, intensive Grid dimension at equal intervals is N, and the hydrophone is randomly distributed in the n in N number of grid position at equal intervals at random
On position, hydrophone arrangement is as follows:
1) N number of point is divided into n sections；, can be with equal part when N is the integral multiple of n, each section has a point of int (N/n)；When N not
For n integral multiple when, there remains n after equal partr=N-int (N/n) * n point, wherein int () is rounding operation；
2) in n section, n is randomly choosedrA section；Then by remaining nrA point is included into the n selected at randomrIn a section；
3) from step 2) treated n section, installation site of the point as hydrophone is respectively randomly extracted.
Further, in the power and active section, the posture instrument is installed at 1/4 and 3/4 position of each subsegment,
Can be uniformly distributed posture instrument when guaranteeing the connection of multiple subsegments, the posture information of cable is received convenient for calculation of measured data.
Further, the hydrophone selection resistance to pressure is enough, power supply is sufficient, and tentatively obtains detection mesh in existing data
On the basis of marking size and range, suitable benchmark road spacing is selected to refer to the road to the cable for being applied to routinely be spacedly distributed
Spacing.
Further, in the power and active section, there are two battery compartments and one to adopt with control platform tool for the power supply
Collection control storehouse is respectively completed system power supply and system control work；Two battery compartment parallel connections access acquisition control storehouse, acquisition control
Data receiver cable is accessed by 16 core watertight cables in storehouse.
Further, in the power and active section, small-sized deep-sea propeller is connected by cable and power supply with control platform
It connects, for controlling the posture of data receiver cable.
On the other hand, the present invention provides a kind of random received vertical-rise cable seismic data acquisition method, including following step
It is rapid:
1) system configuration: need to know that the high-precision terrain information of operating area, job position cannot surpass before laying
Cross the maximum operating water depth of system；According to the parameter of the weight of system and floating ball, matching for three sets of floating ball groups of whole system is calculated
It sets and combines (size and number), the buoyancy of guarantee system in water is 1.5~2.0 times of weight；
2) system is laid: it is put into sea with the sequence cloth of positioning section, power and active section, fixation and releasing section according to being straightened,
System is sunk to seabed by the self weight of last resort weight anchor, and is fixed on seabed surface；It is called by acoustic releaser deck unit
Acoustics transponder and acoustic releaser determine that equipment is working properly；
3) data acquire: the hydrophone in data receiver cable is responsible for recording vibration signal, and posture instrument is responsible for where record
The posture of position；
4) system recycles: calling acoustic releaser by acoustic releaser deck unit；On acoustic releaser taken-over vessel
Acoustic control signal controls its release hook opening, completes the separation with shackle, and weight anchor stays in seabed, and rest part floats and returns
It receives；
5) it data processing: is carried out at reconstruction using random distribution data of the compressed sensing based method for reconstructing to acquisition
Reason obtains regular grid data.Sparse transformation of the warp wavelet (Curvelet transformation) as seismic data is mainly selected, is adopted
Data reconstruction is carried out with Accelerated iteration threshold method, specific as follows:
The sampling process of seismic data can be stated are as follows:
B=Rf, (1)
Wherein,It is sampling seismic data,It is sampling matrix (n < N≤2n),Regular earthquake
Data.
Use Curvelet transformation as the sparse transformation of seismic data, f has sparsity in sparse transform-domain S, then
(1) it can convert are as follows:
B=Ax with A:=RS*, (2)
Wherein, * indicates conjugation.It is the rarefaction representation of f for the coefficient (only k nonzero value) in S of f.
Mathematically it has been proved that (2) can still be solved, on condition that limited equidistant characteristics obtains meeting random theory
Show to can achieve above-mentioned target when R is the gaussian random matrix being distributed with independent conformity.At this time need solve with
Lower problem:
Wherein, | | x | |0:=# { x, xi≠ 0 } l for being x0Norm, xiIt is i-th of x.Use method of Lagrange multipliers
Constrained problem (3) is rewritten as unconfined problem:
Here,For the estimation of x.
We solve (4) using iteration threshold method, and scheme is as follows:
Wherein, i is iteration index index, and θ is threshold value, is gradually decreased with the number of iterations,For
Step-length guarantees the stability and convergence rate of iterative algorithm,For thresholding algorithm.
Iterate to threshold value is lower than sparse domain maximum value 10-5When stop iteration, obtain solving resultAnd then it obtains to the end
Data reconstruction result
Further, before system is laid, by power supply with control platform and time server or GPS to clock, to obtain height
Precision initial time completes the time synchronization of each primitive.
The invention has the benefit that
(1) hydrophone on reception channel is installed using random reception mode, certain hydrophone quantity can obtain longer
Vertical-rise cable length, improve Observable range, reduce detection cost, improve observation effect；
(2) the underwater posture of the small-sized adjustable cable of deep-sea propeller keeps angle vertical or that inclination is certain,
The seismic reflection signals for obtaining different target geologic body are more advantageous to, the investigative range of normal cable is extended；
(3) it receives cable and uses the combination connection design of multiple subsegments, it can be convenient, flexible according to different detection targets
The extension and adjustment of system are completed in ground, improve system to the adaptability of observed object；
(4) maximum operating water depth is 6000m, cooperates high-resolution spark source or submarine low-frequency sound source, can be with
Meets the needs of current deep-sea ocean mining site resource investigation in China.
Detailed description of the invention
Fig. 1 is vertical-rise cable system for acquiring seismic data entirety composition schematic diagram of the present invention；
Fig. 2 is the fixed schematic diagram with releasing section in Fig. 1；
Fig. 3 is hydrophone arrangement schematic diagram in data receiver cable in Fig. 1；
Fig. 4 is the schematic diagram of power and active section and the comparison diagram with normal cable in Fig. 1；
Fig. 5 is power supply and control platform schematic diagram in Fig. 1；
Fig. 6 is the schematic diagram being straightened in Fig. 1 with positioning section；
Fig. 7 is that the data acquired using the cable of 32 primitives and reconstructed results are illustrated；
Fig. 8 is the inclination Randomized Cable schematic diagram using small-sized deep-sea propeller；
In figure: 1 fixed and releasing section；2 power and active section；3 are straightened and positioning section；1.1 weight anchor；1.2 steel loop；1.3 steel
Chain；1.4 shackle；1.5 release hook；1.6 fixed frame；1.7 acoustic releaser；1.8 pressure sensor；1.9 first floating ball groups；1.10
Fixed and releasing section Kev drawstring；2.1 data receiver cables；2.2 hydrophone；2.3 posture instrument；2.4 power supplies and control platform；
2.4.1 steady rest；2.4.2 battery compartment；2.4.3 acquisition control storehouse；2.4.4 four core watertight air plug (male connector)；2.4.5 the one or four core
Watertight air plug (female)；2.4.6 the two or four core watertight air plug (female)；2.4.7 16 core watertight air plug (female)；2.5 second
Floating ball group；3.1 are straightened and positioning section Kev drawstring；3.2 acoustics transponders；3.3 third floating ball groups.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The embodiment of the invention provides a kind of random received vertical-rise cable system for acquiring seismic data and methods.
In the first aspect of the present invention, a kind of random received vertical-rise cable system for acquiring seismic data is provided.
As shown in Figure 1, the system includes sequentially connected fixation from the bottom to top and releasing section 1, power and active section 2, draws
Directly with positioning section 3；
As shown in Fig. 2, it is fixed include with releasing section 1 weight anchor 1.1, steel loop 1.2, steel chain 1.3, shackle 1.4, release hook 1.5,
Fixed frame 1.6, acoustic releaser 1.7, pressure sensor 1.8, the first floating ball group 1.9 and fixed and releasing section Kev drawstring
1.10.Weight anchor 1.1 connect steel loop 1.2 with releasing section Kev drawstring 1.10 by fixed for fixing whole system in seabed.Sound
It learns release 1.7 and uses two sets of equipment work in combination, improve the reliability of system release, the release hook 1.5 of two releases 1.7
Between by steel chain 1.3 be connected, and steel chain 1.3 pass through steel loop 1.2.Two acoustic releasers 1.7 pass through urethane solid material
The fixed frame 1.6 being made into is fixed together, and works at the same time, and plays the role of dual fail-safe.Top is in fixed and releasing section Kev
Drawstring 1.10 installs the pressure sensor 1.8 of a hydraulic pressure information data for measuring and storing position, and is connected to
First floating ball group 1.9.
As shown in figure 3, being advised when arranging the position of the hydrophone 2.2 in the data receiver cable 2.1
A part of position then chosen on the basis of dense distribution using segmentation stochastic sampling strategy.Being segmented stochastical sampling has " blue
Noise " spectrum signature is conducive to subsequent reconstruction processing.Here in two kinds of situation, 1) intensive mesh point at equal intervals is hydrophone
The integral multiple of number, 31 are distributed for normal cable hydrophone, are first segmented, every section of 2 points；32 indicate to randomly choose from every section
One position has obtained final design scheme as hydrophone position.2) intensive mesh point at equal intervals is not hydrophone
Several integral multiples, 33 are distributed for normal cable hydrophone, are first segmented, every section of 2 points there remains 1 point；Then by the point
It is randomly adjusted in some section；34 indicate to have obtained as hydrophone position finally from one position of every section of random selection
Design scheme.
As shown in 41 in Fig. 4, power and active section 2 include data receiver cable 2.1, hydrophone 2.2, posture instrument 2.3,
Power supply and control platform 2.4 and the second floating ball group 2.5.Wherein, various kinds of sensors is mounted on the deep-sea data full of liquid silicone oil
It receives in cable 2.1, including hydrophone 2.2 and posture instrument 2.3.Pass through Kev drawstring stress inside data receiver cable；Per pass
It is used using 4 hydrophone superpositions, hydrophone uses piezoelectric type deep-sea spherical hydrophone, can work normally at the deep-sea 6000m；
Posture instrument 2.3 is installed at 1/4 and 3/4 position of cable.
Here several concepts are first introduced, random received vertical-rise cable of the invention is the base in the roads spacing cable such as conventional
It is obtained on plinth by certain randomized policy (the present embodiment is using segmentation stochastic sampling strategy) sampling, corresponding normal cable
Road spacing be known as the benchmark road spacing of random distribution cable, the road number of corresponding normal cable is known as the base of random distribution cable
The ratio of quasi- road number, actual road number and benchmark road number is known as the sampling ratio of random distribution cable.It is to receive shown in 41 in Fig. 4
Dao Gong 16, the cable that length is 160m, benchmark road spacing are 5m, and benchmark road number is 32, and sampling is than being 1/2.In Fig. 4 shown in 42
Be spacing be 5m, 32, length be 160m cable, it can be seen that the present invention can save 16 totally 64 hydrophones at
This, obtains the cable of equal length.If can only obtain spacing 5m, 16 according to the method for the conventional spacing of road at equal intervals
Length be 80m reception cable (in Fig. 4 shown in 43)；With the reception cable phase of random received 160m length of the invention
Than the performance for acquiring data substantially reduces.
As shown in figure 5, power supply includes a steady rest 2.4.1, two battery compartment 2.4.2 with control platform 2.4 and adopts
Collection control storehouse 2.4.3.Interface on battery compartment 2.4.2 is four core watertight air plug (male connector) 2.4.4, can pass through underwater electrical connector
It is connected on the one or four core watertight air plug (female) 2.4.5 on the 2.4.3 of acquisition control storehouse.On the 2.4.3 of acquisition control storehouse
Two or four core watertight air plug (female) 2.4.6 are used for Connection Time server, and 16 core watertight air plug (female) 2.4.7 pass through watertight
Connector is connected on the special interface of data receiver cable 2.1, realizes the transfer function of power supply and control signal.
As shown in fig. 6, being straightened with positioning section 3 includes being straightened and positioning section Kev drawstring 3.1, acoustics transponder 3.2 and the
Three floating ball groups 3.3.Acoustics transponder 3.2 plays the function of junior range positioning, and third floating ball group 3.3 is made of multiple floating balls,
For whole system to be straightened, by buoyancy calculations reasonable disposition quantity, vertical-rise cable is made to keep vertical or close vertical in seabed
State.
In the second aspect of the present invention, a kind of random received vertical-rise cable seismic data acquisition method is provided, including
Following steps:
Step 1: system configuration.Need to know the high-precision terrain information of operating area before laying, job position can not
To be more than the maximum operating water depth of system, select relatively flat region as the region of laying system；According to the weight of system
With the parameter of floating ball, calculate the configurations of three sets of floating ball groups of whole system with combine (size and number)；
Step 2: system is laid.The posture instrument and data receiver cable 2.1 of small-sized deep-sea propeller 2.6 are corrected before being lauched
Posture instrument 2.3 read.According to being straightened and positioning section 3, power and active section 2, the fixed sequence with releasing section 1 (referring to Fig. 1)
Cloth is put into sea, whole system is sunk to seabed finally by the self weight of weight anchor 1.1, and be fixed on seabed surface；
Step 3: data acquisition.Power and active section 2 start to carry out Data acquisition and storage.Wherein, each hydrophone 2.2
It is responsible for record vibration signal, posture instrument 2.3 is responsible for the posture of record position.In addition, pressure sensor 1.6 records hydraulic pressure letter
Cease data；
Step 4: system recycling.When operation ship reaches near system place of entry at 500m~1000m, pass through acoustic releaser
Deck unit carries out call communication to acoustic releaser 1.7, at least determines that one of them is working properly, and acquires distance letter
Breath.After ready, release signal is issued to acoustic releaser 1.7 using deck unit.On 1.7 taken-over vessel of acoustic releaser
Acoustic control signal controls its release hook 1.5 opening, completes the separation with shackle 1.4, and weight anchor 1.1 is left on seabed, remaining part
Divide recycling.
Step 5: data processing.The data that acquisition obtains are a kind of data of random distribution, and data processing can be used two
Kind method.The first, advanced row data reconstruction obtains the data on regular position, then carries out the subsequent processing that routinizes；It can be with
It is handled using compressed sensing based data re-establishing method.It second, is directly carried out using the data of this random distribution
Imaging.Two class methods feasibility all with higher.
As shown in fig. 7,71 be to be collected using the vertical-rise cable of 16 random reception channels, 5m benchmark road spacing, 160m long
Seismic data, be a kind of irregular data in random scarce road.It is handled, has been obtained as shown in 72 comprising 32 by data reconstruction
The regular seismic channel data in road, the road 5m spacing.
Overall structure of the present invention is lighter, uses 2 capture segments (16 random reception channels, 5m benchmark road spacing, 160m long)
When work, weight about 500kg in whole system air (is free of cement block weight anchor), is under the action of floating ball in water
Existing positive buoyancy state, it is substantially upright in seabed surface at the lesser deep-sea of underflow.It is improved using the design of double acoustic releasers 1.7
The job stability of system.It according to the size and range of detection target, can neatly adjust the quantity of capture segment, change electricity
Cable length, the deep-sea sulfide deposit for meeting different type and scale reconnoitre demand.System maximum operating water depth 6000m, water
It listens device that broadband (10Hz-6kHz) reception may be implemented, cooperates high-resolution spark source or submarine low-frequency sound source, it is full
The detection demand of the mineral resources such as sufficient deep-sea high-resolution geological structure, gas hydrates, Polymetallic sulphide.Power supply and control
The design of platform processed greatly reduces the complexity of whole system, and equipment of being more convenient for laying and recycling.
Embodiment 2
As shown in figure 8, increasing small-sized deep-sea propeller 2.6 to control vertical-rise cable posture.
Small-sized deep-sea propeller 2.6 carries posture instrument, correction posture instrument reading before being lauched；Pass through cable and power supply and control
Platform 2.4 processed is connected, the data information for the posture instrument 2.3 installed in available data receiver cable 2.1.
When needing to change data receiver 2.1 inclined direction of cable according to detection target, by comparing itself posture
Information and the cable posture information obtained by posture instrument 2.3 on cable, the direction of adjust automatically propulsive force and size, make data
It receives cable 2.1 and keeps vertical or certain tendency and inclination angle.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of random received vertical-rise cable system for acquiring seismic data, which is characterized in that the system include from the bottom to top according to
The fixation and releasing section (1) of secondary connection, are straightened and positioning section (3) power and active section (2)；
The fixation and releasing section (1) include by Kev drawstring (1.10) sequentially connected weight anchor (1.1), with distance measurement function
Acoustic releaser (1.7), pressure sensor (1.8) and the first floating ball group (1.9)；The weight anchor (1.1) is for fixing system
In seabed surface, the acoustic releaser (1.7) is for completing system recycling, and the pressure sensor (1.8) is for recording pressure
Force data, the first floating ball group (1.9) avoid bottom device from bottoming out for system to be straightened；
The power and active section (2) include data receiver cable (2.1), power supply and control platform (2.4) and the second floating ball group
(2.5)；The hydrophone (2.2) for being responsible for record vibration signal is installed in the data receiver cable (2.1) and is responsible for record institute
In the posture instrument (2.3) of position and attitude, position of the hydrophone (2.2) in data receiver cable (2.1) is random distribution；Institute
Power supply and control platform (2.4) are stated for completing system power supply and system control work, above power supply with control platform (2.4)
Second floating ball group (2.5) is installed；
Described be straightened with positioning section (3) includes the sound for being used to determine point position connected using Kev drawstring (3.1)
Transponder (3.2) and the third floating ball group (3.3) for whole system to be straightened are learned, the third floating ball group (3.3) is located at the whole series
The top of system.
2. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 1, which is characterized in that institute
It states in fixed and releasing section (1), the acoustic releaser (1.7) with distance measurement function uses two sets of equipment work in combination, improves
The reliability of system release, is connected between the release hook (1.5) of two releases (1.7), and steel chain by steel chain (1.3)
(1.3) steel loop (1.2) are passed through, steel loop (1.2) passes through Kev drawstring (1.10) connection weight anchor (1.1).
3. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 1, which is characterized in that institute
It states in power and active section (2), the distribution of the hydrophone (2.2) is designed using segmentation stochastic sampling strategy；Data connect
It receives cable (2.1) segmentation to connect, practical organize is attached in cable using multiple subsegments；The data receiver cable
(2.1) in, if hydrophone number is n, intensive Grid dimension at equal intervals is N, the hydrophone be randomly distributed in it is N number of at equal intervals
On n random site in grid position, hydrophone arrangement is as follows:
1) N number of point is divided into n sections；, can be with equal part when N is the integral multiple of n, each section has a point of int (N/n)；When N is not n
Integral multiple when, there remains n after equal partr=N-int (N/n) * n point, wherein int () is rounding operation；
2) in n section, n is randomly choosedrA section；Then by remaining nrA point is included into the n selected at randomrIn a section；
3) from step 2) treated n section, installation site of the point as hydrophone is respectively randomly extracted.
4. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 3, which is characterized in that institute
It states in power and active section (2), the posture instrument (2.3) is installed at 1/4 and 3/4 position of each subsegment, multiple to guarantee
Subsegment can be such that posture instrument (2.3) is uniformly distributed when connection, and the posture information of cable (2.1) is received convenient for calculation of measured data.
5. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 1, which is characterized in that institute
It states in power and active section (2), hydrophone (2.2) the selection resistance to pressure is enough, power supply is sufficient, and tentatively obtains in existing data
On the basis of taking detection target sizes and range, suitable benchmark road spacing is selected.
6. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 1, which is characterized in that institute
It states in power and active section (2), there are two battery compartment (2.4.2) and an acquisition to control with control platform (2.4) tool for the power supply
Storehouse (2.4.3) processed is respectively completed system power supply and system control work；Two battery compartments (2.4.2) access acquisition control in parallel
Storehouse (2.4.3), acquisition control storehouse (2.4.3) pass through 16 core watertight cables access data receiver cable (2.1).
7. a kind of random received vertical-rise cable system for acquiring seismic data according to claim 1, which is characterized in that institute
It states in power and active section (2), small-sized deep-sea propeller (2.6) is connect by cable with power supply with control platform (2.4), is used for
Control the posture of data receiver cable (2.1).
8. a kind of random received vertical-rise cable seismic data acquisition method, which comprises the following steps:
1) system configuration: according to the parameter of the weight of system and floating ball, calculate the configurations of three sets of floating ball groups of whole system with combine,
The buoyancy of guarantee system in water is 1.5~2.0 times of weight；
2) system is laid: being laid according to being straightened with positioning section (3), power and active section (2), the fixed sequence with releasing section (1)
Enter sea, system is sunk to seabed by the self weight of last resort weight anchor (1.1), and is fixed on seabed surface；Pass through acoustic releaser first
Plate unit calls acoustics transponder (3.2) and acoustic releaser (1.7), determines that equipment is working properly；
3) data acquire: the hydrophone (2.2) in data receiver cable (2.1) is responsible for record vibration signal, and posture instrument (2.3) is negative
The posture of duty record position；
4) system recycles: calling acoustic releaser (1.7) by acoustic releaser deck unit；Acoustic releaser (1.7) receives
Acoustic control signal on ship controls its release hook (1.5) opening, completes the separation with shackle (1.4), and weight anchor (1.1) stays in
Seabed, rest part float and recycle；
5) data processing: carrying out reconstruction processing using random distribution data of the compressed sensing based method for reconstructing to acquisition, weight
It builds to carry out routine data processing after regular grid data.
9. random received vertical-rise cable seismic data acquisition method according to claim 8, which is characterized in that the step
Rapid 5) Data processing selects sparse transformation of the warp wavelet (Curvelet transformation) as seismic data, using Accelerated iteration
Threshold method carries out data reconstruction, specific as follows:
The sampling process of seismic data can be stated are as follows:
B=Rf, (1)
Wherein,It is sampling seismic data,It is sampling matrix (n < N≤2n),For regular earthquake number
According to.
Use Curvelet transformation as the sparse transformation of seismic data, f has sparsity in sparse transform-domain S, then (1) can
With conversion are as follows:
B=Ax with A:=RS*, (2)
Wherein, * indicates conjugation.It is the rarefaction representation of f for the coefficient (only k nonzero value) in S of f.
Mathematically it has been proved that (2) can still be solved, on condition that limited equidistant characteristics obtains meeting random theory table
It is bright, it can achieve above-mentioned target when R is the gaussian random matrix being distributed with independent conformity.It at this time needs to solve following
Problem:
Wherein, | | x | |0:=# { x, xi≠ 0 } l for being x0Norm, xiIt is i-th of x.To be had about using method of Lagrange multipliers
The problem of beam (3), is rewritten as unconfined problem:
Here,For the estimation of x.
We solve (4) using iteration threshold method, and scheme is as follows:
Wherein, i is iteration index index, and θ is threshold value, is gradually decreased with the number of iterations,For step-length,
Guarantee the stability and convergence rate of iterative algorithm,For thresholding algorithm.
Iterate to threshold value is lower than sparse domain maximum value 10-5When stop iteration, obtain solving resultNumber to the end is obtained in turn
According to reconstructed results
10. a kind of random received vertical-rise cable seismic data acquisition method according to claim 8, which is characterized in that
Before system is laid, by power supply with control platform (2.4) and time server or GPS to clock, to obtain high-precision initial time,
Complete the time synchronization of each primitive.
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| CN113534260A (en) * | 2021-07-20 | 2021-10-22 | 自然资源部第二海洋研究所 | Broadband near-seabed deep-sea geological structure acoustic detection system and method |
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