CN109100777A - Frequency conversion type oceanic high air gun - Google Patents
Frequency conversion type oceanic high air gun Download PDFInfo
- Publication number
- CN109100777A CN109100777A CN201811216240.XA CN201811216240A CN109100777A CN 109100777 A CN109100777 A CN 109100777A CN 201811216240 A CN201811216240 A CN 201811216240A CN 109100777 A CN109100777 A CN 109100777A
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- Prior art keywords
- air gun
- fixed link
- frequency conversion
- limited block
- conversion type
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000000837 restrainer Substances 0.000 claims 1
- 230000005284 excitation Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005281 excited state Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052569 sulfide mineral Inorganic materials 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/04—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/133—Generating seismic energy using fluidic driving means, e.g. highly pressurised fluids; using implosion
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Toys (AREA)
Abstract
The invention discloses a kind of frequency conversion type oceanic high air guns.It includes the components such as air gun controller, air storage chamber, fixed link, sleeve, initial position-limit mechanism and capping, and adjustable limited block is arranged in fixed link.In excitation process, by limiting between limited block and sleeve positive stop end, the length of air storage chamber venthole is controlled, by adjusting Opening length, i.e., adjustable outlet speed realizes the control to excitation wavelet frequency.
Description
Technical field
The invention belongs to marine seismic prospectiong fields, and in particular to a kind of frequency conversion type oceanic high air gun.
Background technique
Air gun source is a kind of focus being most widely used in current marine seismic prospectiong.It is that current offshore oil is surveyed
It visits, the main focus of natural gas hydrate exploration, also plays important work in terms of subbottom structure and evolution, continental shelf
With.Air gun source is mainly by injecting high pressure gas into seawater, to generate transient pulse, forms source wavelet.This seed
Speed (outlet aperture) in frequency characteristic and high pressure gas the injection water of wave has close relationship.Fig. 1 simulates difference and goes out
Source wavelet and its spectrum curve under the conditions of stomata diameter.By comparison as can be seen that outlet aperture is bigger, rate of gas release
It is faster, so as to the higher peak value of pulse (Fig. 1 a) of output, more high frequency signals can be obtained in frequency domain accordingly, but
It is pore size for low-frequency effects very little, it is as shown in Figure 1 b, different in the 0-100Hz frequency band that oil-gas exploration is concerned about the most
Outlet aperture caused by difference very little.This high-frequency energy obtain pressed focus be better able to meet protected with marine organisms
Green source design concept for the purpose of shield.But then, it in the detection of some sea-bottom shallow structures, needs to utilize high-frequency energy
It measures to improve the resolution ratio of seismic data, such as Seafloor Sulfide mineral deposit SMS (Seafloor Massive Sulfide).SMS
Because multiple educate in sea-bottom shallow, and based on bulk, it is therefore desirable to which higher resolution ratio just can efficiently identify out.It is this
In the case of just need to improve high-frequency energy as far as possible and improve resolution ratio.
Based on analog result, in order to guarantee that excitation obtains high-frequency energy as much as possible, it is necessary to as far as possible will be high
Body of calming the anger is discharged into water as soon as possible, at this time just needs sufficiently large outlet aperture.High-resolution (high-frequency energy) and ocean
There is contradictory relationships between biological protection.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of frequency conversion type oceanic high air cannon shake is provided
Source.
Technical scheme is as follows:
A kind of frequency conversion type oceanic high air gun, including air gun controller, air storage chamber, fixed link, sleeve, initial limit
Position mechanism and capping；
The fixed link is fixed inside air storage chamber, and fixed link is equipped with the limited block of position-adjustable；Sleeve
It is set in fixed link, can be moved along fixed link, and its initial position is limited by initial position-limit mechanism；
Air storage chamber is equipped with venthole, and one end and the capping of sleeve are fixedly linked, and the other end is to realize to open with limited block cooperation
The positive stop end of mouth length limit, the sleeve is completely interior to be received to original state, and the venthole can be covered completely by covering；
The air gun controller, which is connected by signal wire with position-limit mechanism, realizes control；The air storage chamber passes through gas
Conveyance conduit is connected with external air compressor.
Preferably, position of the limited block in fixed link by adjusting completion in advance.As in advance by limited block movement
To suitable position, the position of limited block is then locked, makes its can not move relative to fixed bar.
Alternatively, the adjusting rod that the limited block is set in inside fixed link with one is connected, pass through the mobile band of adjusting rod
The position of the relatively fixed bar of dynamic limited block, and the position of limited block is fixed by locking adjusting rod.
Alternatively, the air gun controller passes through position of the signal line traffic control limited block in fixed link, for example, described
Limited block, which is driven by motor, move up and down it can along fixed link, and can be in fixed link latched position.
It is more further, the place or sleeve positive stop end of the locating part and sleeve limit end in contact and locating part
The place of contact is equipped with elastic cushioning material, such as rubber material, for weakening impact.
Preferably, the initial position-limit mechanism is setting telescopic convex block in fixed link, and the convex block is by air gun
It is flexible that controller controls it.
Preferably, the air storage chamber is cylindrical, and the fixed link is located at its axle center.It is more further, it is described
Venthole be located at a cylindric end face, at circle；The gas transmission pipeline is located at another end face of air storage chamber.
More further, the gas transmission pipeline is equipped with valve, and the aperture of the valve is controlled by air gun
Device control.
The present invention at work, first original state when, sleeve is limited in initial position by initial position-limit mechanism, capping lid
Firmly venthole is in air-tight state.
Position of the limited block in fixed link is adjusted and locks, which determines final capping relative to venthole
Opening length L, and Opening length is bigger, then shows that venthole diameter is bigger, rate of gas release is faster, higher so as to output
Peak value of pulse, more high frequency signals can be obtained in frequency domain accordingly.
After the adjustment of limited block position, gas enters air storage chamber by gas transmission pipeline and reaches required pressure.
When explosive source, air gun controller controls initial position-limit mechanism and cancels limit, and sleeve can be along fixed link at this time
It is mobile；Under high pressure gas effect, sleeve is mobile relative to fixed bar, and opens venthole；When the positive stop end of sleeve is moved to limit
It when at the block of position, can not just be moved again, thus can cover opening relative to venthole according to the position control of limited block
Mouth length L, then controls rate of gas release, obtains corresponding frequency.
If the sleeve that need to bounce back to initial position, can be bounced back by driving limited block band moving sleeve, after reaching setting position,
Sleeve is limited by initial position-limit mechanism again.
In order to reach balance as far as possible, the present invention devises a frequency conversion type high pressure airgun focus, and this design is most
Big feature just can be achieved on the selection of different excitation modes, and instruction is passed to pore size control system by signal transmission system
System, realizes the unlatching in different outlet apertures, thus the control of tangible outlet speed, reduction/increase high-frequency energy.For example, with
In acquisition for the purpose of oil-gas exploration, it is set as low outlet speed, to reduce the high frequency harmful to marine organisms as far as possible
Energy.It in acquisition for the purpose of by SMS, is set as being higher by gas velocity degree, to guarantee the excitation of high-frequency energy.
Detailed description of the invention
Simulation source wavelet (a) and its spectrum curve (b) under the conditions of Fig. 1 difference outlet aperture；
Fig. 2 is frequency conversion type oceanic high air gun status diagram to be excited of the present invention；
Fig. 3 is frequency conversion type oceanic high air gun excited state schematic diagram of the present invention；
Fig. 4 is the limited block and initial position-limit mechanism schematic diagram in embodiment.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
It as shown in Figures 2 and 4, is present invention status diagram to be excited, frequency conversion type oceanic high air gun, including gas
Gun controller 6, air storage chamber 1, fixed link 2, sleeve 3, initial position-limit mechanism 5 and capping 4；The fixed link 2 is fixed at
Inside air storage chamber 1, fixed link 2 is equipped with the limited block 7 of position-adjustable；Sleeve 3 is set in fixed link 2, can be along fixed link
It is mobile, and its initial position is limited by initial position-limit mechanism 5；Air storage chamber 1 is equipped with venthole 8, and one end of sleeve 2 and capping 4 are solid
Fixed to be connected, the other end realizes the positive stop end of Opening length limit to cooperate with limited block 7, and the sleeve is completely interior to be received to initial shape
After state, capping 4 can cover the venthole 8 completely.
In state to be excited, air storage chamber is in air-tight state.
As shown in figure 4, in the present embodiment, the limited block 7 is set in 11 phase of adjusting rod inside fixed link with one
Even, adjusting rod 11 can move up and down, and be connected by the fluting 12 in fixed link with limited block 7, so that adjusting rod 11 can drive
Limited block 7 moves up and down, and locks adjusting rod 11 by locking part 13 to fix the position of limited block 7.
In the present embodiment, the initial position-limit mechanism 5 be arranged in fixed link telescopic convex block, the convex block by
It is flexible that air gun controller 6 controls it.The positive stop end 10 of sleeve 3 is equipped with for cooperating convex block to carry out the recessed of initial position limit
Cave.
As shown in figure 3, initial position-limit mechanism 5 is recycled to inside fixed link when excited state；The capping 4 of sleeve 3 is in air pressure
Effect is lower to open, and moves with moving sleeve 3 along fixed link, and positive stop end 10 stops when reaching 7 position of limited block, opening at this time
Mouth length L is the Opening length of this excitation.By adjusting Opening length L, i.e., adjustable outlet speed is realized to high-frequency energy
The control of amount.
In addition to the structure shown in Fig. 4, position of the limited block 7 in fixed link can also adjust completion in advance.As in advance
Limited block 7 is moved to suitable position, then locks the position of limited block 7, makes its can not move relative to fixed bar.
Alternatively, the air gun controller 6 passes through position of the signal line traffic control limited block 7 in fixed link, for example, described
Fixed link be equipped with rack gear, the limited block 7 be equipped with gear, gear is driven by motor along rack movement, makes limited block 7
It can be moved up and down along fixed link 2, and can be in 2 latched position of fixed link.
Preferably, the locating part is contacted with the place of sleeve limit end in contact or sleeve positive stop end with locating part
Place is equipped with elastic cushioning material, such as rubber material, for weakening impact.
Preferably, the air storage chamber is cylindrical, and the fixed link is located at its axle center.It is more further, it is described
Venthole 8 be located at a cylindric end face, at circle；The gas transmission pipeline is located at another end face of air storage chamber.
More preferred, the gas transmission pipeline is equipped with valve, and the aperture of the valve is by air gun controller
Control.
Claims (8)
1. a kind of frequency conversion type oceanic high air gun, it is characterised in that including air gun controller (6), air storage chamber (1), fix
Bar (2), sleeve (3), initial position-limit mechanism (5) and capping (4)；
The fixed link (2) is fixed at air storage chamber (1) inside, and fixed link (2) is equipped with the limited block of position-adjustable
(7)；Sleeve (3) is set on fixed link (2), can be moved along fixed link, and its initial position is limited by initial position-limit mechanism (5)
It is fixed；
Air storage chamber (1) is equipped with venthole (8), and one end and the capping (4) of sleeve (2) are fixedly linked, and the other end is and limited block (7)
The positive stop end that Opening length is adjusted is realized in cooperation, and the sleeve is completely interior to be received to original state, and capping (4) can cover institute completely
The venthole (8) stated；
The air gun controller (6), which is connected by signal wire with initial position-limit mechanism (5), realizes the control of initial position-limit mechanism (5)
System；The air storage chamber (1) is connected by gas transmission pipeline (9) with external air compressor.
2. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the limited block (7) with
One adjusting rod for being set in inside fixed link is connected, and fixes the position of bar relatively by the mobile drive limited block (7) of adjusting rod,
And the position of limited block (7) is fixed by locking adjusting rod.
3. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the air gun controller
(6) pass through position of the signal line traffic control limited block (7) in fixed link.
4. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the locating part and set
The place that the place of cylinder limit end in contact or sleeve positive stop end are contacted with locating part is equipped with elastic cushioning material.
5. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the initial position restrainer
Structure (5) is that telescopic convex block is arranged in fixed link, which is controlled flexible by air gun controller (6).
6. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the air storage chamber is in circle
Tubular, the fixed link are located at its axle center.
7. frequency conversion type oceanic high air gun according to claim 6, it is characterised in that described venthole (8) position
It is rounded in a cylindric end face；The gas transmission pipeline is located at another end face of air storage chamber.
8. frequency conversion type oceanic high air gun according to claim 1, it is characterised in that the air shooter
Road is equipped with valve, and the aperture of the valve is controlled by air gun controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216240.XA CN109100777A (en) | 2018-10-18 | 2018-10-18 | Frequency conversion type oceanic high air gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216240.XA CN109100777A (en) | 2018-10-18 | 2018-10-18 | Frequency conversion type oceanic high air gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109100777A true CN109100777A (en) | 2018-12-28 |
Family
ID=64869033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811216240.XA Pending CN109100777A (en) | 2018-10-18 | 2018-10-18 | Frequency conversion type oceanic high air gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109100777A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112987080A (en) * | 2021-04-22 | 2021-06-18 | 自然资源部第一海洋研究所 | Seabed multi-wave seismic source and seabed detection system |
| CN116559936A (en) * | 2023-05-10 | 2023-08-08 | 中国矿业大学 | Internally-exploded ocean negative pressure air gun seismic source and excitation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112987080A (en) * | 2021-04-22 | 2021-06-18 | 自然资源部第一海洋研究所 | Seabed multi-wave seismic source and seabed detection system |
| CN116559936A (en) * | 2023-05-10 | 2023-08-08 | 中国矿业大学 | Internally-exploded ocean negative pressure air gun seismic source and excitation method thereof |
| CN116559936B (en) * | 2023-05-10 | 2024-02-02 | 中国矿业大学 | Internally-exploded ocean negative pressure air gun seismic source and excitation method thereof |
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