CN209433022U - A kind of marine seismic acquisition system carried based on mobile platform - Google Patents
A kind of marine seismic acquisition system carried based on mobile platform Download PDFInfo
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- CN209433022U CN209433022U CN201920166436.6U CN201920166436U CN209433022U CN 209433022 U CN209433022 U CN 209433022U CN 201920166436 U CN201920166436 U CN 201920166436U CN 209433022 U CN209433022 U CN 209433022U
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Abstract
The utility model discloses a kind of marine seismic acquisition systems carried based on mobile platform.System includes lash ship, focus and near Sea Bottom observation system；Near Sea Bottom observation system includes the hydrophone array that AUV and AUV is carried；Hydrophone array is located at below focus；The length and rotation angle for adjusting lateral adjustments bar, adjust the length of the first depth adjustment bar and the second depth adjustment bar, can carry out the adjustment of hydrophone array posture, to adapt to the posture demand in the case of different observed objects and acquisition.System based on the utility model, epicenter excitation signal can be recorded rapidly after subsurface reflector position is reflected, and shorten transmission range；Array horizontal position is listened by adjusting focus and water, the acquisition of zero-near migration range may be implemented.
Description
Technical field
The utility model belongs to marine seismic prospectiong field, and in particular to a kind of offshore earthquake carried based on mobile platform
Detection system.
Background technique
In current towing line type marine seismic prospectiong, the presence of sea water layer causes strong attenuation to seismic signal, reduces
The signal-to-noise ratio and resolution ratio of acquired seismic data, simultaneously because the limitation of practice of construction, acquisition system apart from focus often
It can keep certain distance, minimum range (smallest offset away from) can be changed by tens of rice to several hundred meters.And it is based on submarine seismograph OBS
Although active source acquisition can greatly shorten signal propagation distance and can above OBS explosive source to realizing zero bias
It moves away from acquisition, but since the position OBS is fixed, can only realize the near migration range acquisition of seabed specific region.Near migration range data pair
Have great importance in sea-bottom shallow structure imaging.
Summary of the invention
The purpose of the utility model is to overcome the deficiencies in the prior art to overcome simultaneously in order to obtain near migration range data
Conventional streamers formula earthquake-capturing signal-to-noise ratio and the relatively low problem of resolution ratio, the utility model proposes what is carried based on mobile platform
Seismic acquisition system and its method.
The technical solution of the utility model is as follows:
The marine seismic acquisition system carried based on mobile platform of the utility model includes that lash ship, focus and near Sea Bottom are seen
Examining system；The lash ship is connected by leading cable with focus；The near Sea Bottom observation system includes the water that AUV and AUV is carried
Listen device array；The hydrophone array is located at the near Sea Bottom region below focus.Described hydrophone array one end and first
Depth adjustment bar is connected, and the other end is connected with the second depth adjustment bar, and lateral adjustments bar one end is fixedly connected with AUV, the other end
It is connected with the first depth adjustment bar, the second depth adjustment bar is fixedly linked with lateral adjustments bar close to one end of AUV；The water
It listens device array also to pass through cable to be connected with AUV；The first depth adjustment bar and the second depth adjustment bar is in the depth direction
Length is adjustable, and length is adjustable in the horizontal direction for the lateral adjustments bar.
Preferably, the depth of hydrophone is adjusted according to topographical characteristics.Guarantee bosom hydrophone apart from seabed depth
It maintains between 5m-120m, other positions hydrophone then depends on hydrophone array form away from bottom seabed depth.Thus greatly
Ground shortens the distance that signal reaches acquisition system, and lateral resolution gets a promotion, and high-frequency energy decaying is reduced, longitudinal resolution
Also improved, furthermore influenced also to become smaller by surging, signal-to-noise ratio can significantly be improved.
Preferably, the lateral adjustments bar can rotate about the axis thereof, and adjust hydrophone array with rotation and be located at laterally tune
Pole below or above.
Preferably, the marine seismic acquisition system carried based on mobile platform further includes at least one supplementary observation
System；The structure of the supplementary observation system is identical as near Sea Bottom observation system.
Preferably, the supplementary observation system and near Sea Bottom observation system are located in same horizontal line, near Sea Bottom observation
System is located at below focus, and supplementary observation system and focus keep the horizontal distance set.
Preferably, the supplementary observation system and near Sea Bottom observation system are located on same vertical line, near Sea Bottom observation
System and supplementary observation system are respectively positioned below focus, and wherein supplementary observation system is located above near Sea Bottom observation system.
Based on the marine seismic exploration method that mobile platform carries, steps are as follows:
1) focus is connect by leading cable with lash ship；The length and rotation angle for adjusting lateral adjustments bar, adjust the first depth
The length of adjusting rod and the second depth adjustment bar makes the hydrophone array of near Sea Bottom observation system that the posture needed be presented；
2) AUV for controlling near Sea Bottom observation system, is located near Sea Bottom observation system hydrophone array below focus, and adjust
Hydrophone array is saved at a distance from seabed；AUV is moved synchronously with lash ship；
3) explosive source, hydrophone array acquire signal.
Preferably, the posture that the hydrophone array is presented can be lateral attitude, perpendicular attitude or horizontal attitude.Water
When deep shallower and destination layer position is shallow-layer, using lateral attitude, ghost reflection arrival time difference may be implemented, provided for subsequent removal
Better data basis；Horizontal attitude, which is conducive to evade, bottoms out risk, and deep-sea shallow-layer target is relatively applicable in；Perpendicular attitude can
To obtain the fine velocity structure of shallow-layer result, it is suitable for horizontal high-resolution seismic exploration and acquires.
Preferably, while arranging near Sea Bottom observation system, supplementary observation system is arranged；The supplementary observation system
Structure it is identical as near Sea Bottom observation system；
The supplementary observation system and near Sea Bottom observation system is located in same horizontal line, and near Sea Bottom observation system is located at
Below focus, supplementary observation system and focus keep the horizontal distance set；To realize that multiple offset distance acquires；
Alternatively, the supplementary observation system and near Sea Bottom observation system are located on same vertical line, near Sea Bottom observation system
System and supplementary observation system are respectively positioned below focus, and wherein supplementary observation system is located above near Sea Bottom observation system；To realize
Angles of azimuth acquisition.
Compared with prior art, the hydrophone array of the utility model can carry out the adjustment of various postures, each to adapt to
For the posture demand of hydrophone array in the case of kind.System based on the utility model, epicenter excitation signal is through sub-bottom reflection
After can be recorded rapidly, since AUV carries the limitation of ability, listen the limited length of array according to water, zero-nearly offset may be implemented
Away from acquisition.
The system can realize that focus and water listen array synchronization and asynchronous acquisition.When asynchronous acquisition, lash ship is motionless, AUV
Autonomous navigation examines principle of reciprocity, the available effect similar to active source OBS according to shake.And when synchronous acquisition, according to shake
Source and array relative position, can obtain underground particular offset away from data.It is directed to shallow structure, it can be using zero (close) offset
Away from acquisition, infrastructure can be acquired using remote offset distance.More array synchronization acquisitions can also be carried out simultaneously, correspondingly may be used
To carry out angles of azimuth acquisition simultaneously, more AUV are laid simultaneously on cross line direction, with lash ship synchronous acquisition, can be obtained
Take the three-dimensional spatial distribution rule of underground medium.
Detailed description of the invention
Fig. 1 is the near Sea Bottom seismic acquisition system schematic diagram carried based on underwater robot AUV；
Fig. 2 listens a gust acquisition mode (level) based on the horizontal water that AUV is carried；
Fig. 3 listens a gust acquisition mode (vertical) based on the AUV vertical water carried；
The multiple offset distance acquisition method schematic diagram that Fig. 4 is carried based on multiple mobile platforms.
Specific embodiment
The utility model is described further with reference to the accompanying drawings of the specification.
Fig. 1 illustrates the near Sea Bottom observation system carried based on cableless underwater robot (AUV) 8.According to exploration targets
Difference, focus 2 can select conventional air gun source to guarantee penetration depth, can also using deep towed electric spark or energy converter into
One step enhances high-frequency energy and improves resolution ratio, and focus is connect by leading cable 3 with lash ship.Hydrophone array 12 as shown in the figure is inclination
Formula water listens array, i.e., different hydrophone depth are different, can increase the ghosting reaching time-difference from sea 1 in this way
Different, so as to carry out more efficiently being identified and being removed in different conversion process again, the water listens array and away from sea
Bottom minimum range is 5m.Water listens array to may be implemented autonomous or power by AUV, and posture mainly passes through connecting cable 9, transverse direction
Adjusting rod 15 and the first depth adjustment bar 10, the second depth adjustment bar 11 realize, depth adjustment bar by two locks 13,14 with
Water listens array to connect.The near Sea Bottom observation system further includes two auxiliary floating balls 6,7, and two auxiliary floating balls connect hydrophone
The tail portion depth of array is listened at the both ends of array for adjusting water, mitigates AUV pose adjustment pressure.Based on the system, epicenter excitation
Signal can be recorded rapidly after seabed 4 is reflected, and since AUV carries the limitation of ability, the limited length of array is listened according to water, can
To realize the acquisition of zero-near migration range 5.
The marine seismic exploration method and step carried based on mobile platform is as follows:
1) focus is connect by leading cable with lash ship；The length and rotation angle for adjusting lateral adjustments bar 15, it is deep to adjust first
The length for spending adjusting rod 10 and the second depth adjustment bar 11 makes the hydrophone array of near Sea Bottom observation system that the appearance needed be presented
State；
2) AUV for controlling near Sea Bottom observation system, is located near Sea Bottom observation system hydrophone array below focus, and adjust
Hydrophone array is saved at a distance from seabed；AUV is moved synchronously with lash ship；
3) explosive source, hydrophone array acquire signal.
It is directed to the apparent complex sea area of surface relief, listens array to collide in the actual construction process to reduce inclination water
Or the risk bottomed out, horizontal water can also be used and listen array acquisition, as shown in Fig. 2, needing to change water at this time listens filling inside array
Material makes towing cable approximation neutral buoyancy, if the depth of water is enough, and detect target be shallow-layer when, the arrival time of ghost reflection is effective at this time
It, can in this way, to reduce the complexity of subsequent processing except region.Or vertical collection is used, as shown in figure 3,
At this time adjustment lateral adjustments bar 15 so that it is shortened to shortest length, then make one, two depth adjustment bars be located at eminence, one
Positioned at lower, and the gap of two depth adjustment bars is equal to the length of hydrophone array.
Acquisition listens array mainly by signal acquisition unit, signal memory cell, power supply unit, auxiliary unit and resistance to water
Ballasting composition, signal memory cell includes multichannel pressure hydrophone, preamplifier and low-pass filter circuit；Storage unit
It is formed including A/D converter circuit, FPGA minimum system, low-power consumption MCU and large capacity SD card；Power supply unit is then by high-energy battery
Group composition, is also equipped with external power supply plug, can be powered by AUV；Auxiliary unit mainly includes high precision clock module, depth
Sensor and posture instrument etc..
Due to AUV can autonomous navigation, which can realize focus and water listens array synchronization and asynchronous acquisition.It is non-same
When step acquisition, lash ship is motionless, AUV autonomous navigation, examines principle of reciprocity according to shaking, the available effect similar to active source OBS,
Only focus is fixed at this time, can quickly and effectively implementation rule or irregularly acquisition (such as ring since AUV is more flexible
Shape acquisition).And when synchronous acquisition, according to focus and array relative position, underground particular offset can be obtained away from data, for
It in shallow structure, can be acquired using zero (close) offset distance, infrastructure can be acquired using remote offset distance.It simultaneously can also
To carry out the acquisition of more array synchronizations, as shown in figure 4, can obtain simultaneously at this time underground medium it is close in remote offset data, can
Shallow-layer and DEEP STRUCTURE information are obtained simultaneously.
Angles of azimuth acquisition can correspondingly be carried out simultaneously, more AUV are laid simultaneously on cross line direction, with lash ship
Synchronous acquisition, the three-dimensional spatial distribution rule of available underground medium.More are being laid simultaneously along survey line and vertical survey line
AUV, can be realized in close remote offset distance and it is small in big azimuthal near Sea Bottom high-resolution synthetical collection.
Embodiment described above is a kind of preferable scheme of the utility model, and so it is not practical to limit
It is novel.Those of ordinary skill in related technical field can be in the case where not departing from the spirit and scope of the utility model
It makes a variety of changes and modification.Therefore all mode technical solutions obtained for taking equivalent substitution or equivalent transformation, all fall within
In the protection scope of the utility model.
Claims (6)
1. a kind of marine seismic acquisition system carried based on mobile platform, it is characterised in that including lash ship, focus and near Sea Bottom
Observation system；The lash ship is connected by leading cable with focus；The near Sea Bottom observation system includes what AUV and AUV was carried
Hydrophone array；The hydrophone array is located at the near Sea Bottom region below focus；
Described hydrophone array one end is connected with the first depth adjustment bar (10), the other end and second depth adjustment bar (11) phase
Even, lateral adjustments bar (15) one end is fixedly connected with AUV, and the other end and the first depth adjustment bar (10) are connected, the second depth tune
Pole (11) is fixedly linked with lateral adjustments bar (15) close to one end of AUV；The hydrophone array also pass through cable (9) with
AUV is connected；Length is adjustable in the depth direction for the first depth adjustment bar (10) and the second depth adjustment bar (11), described
Lateral adjustments bar (15) length is adjustable in the horizontal direction.
2. the marine seismic acquisition system according to claim 1 carried based on mobile platform, it is characterised in that described
Hydrophone array column distance seabed is recently up to 5-120m.
3. the marine seismic acquisition system carried as described in claim 1 based on mobile platform, it is characterised in that the cross
It can be rotated about the axis thereof to adjusting rod (15), hydrophone array is adjusted with rotation and is located at lateral adjustments bar (15) below or above.
4. as described in claim 1 based on mobile platform carry marine seismic acquisition system, it is characterised in that further include to
A few supplementary observation system；The structure of the supplementary observation system is identical as near Sea Bottom observation system.
5. the marine seismic acquisition system carried as claimed in claim 4 based on mobile platform, it is characterised in that described is auxiliary
Observation system and near Sea Bottom observation system is helped to be located in same horizontal line, near Sea Bottom observation system is located at below focus, and auxiliary is seen
Examining system and focus keep the horizontal distance of setting.
6. the marine seismic acquisition system carried as claimed in claim 4 based on mobile platform, it is characterised in that described is auxiliary
Observation system and near Sea Bottom observation system is helped to be located on same vertical line, near Sea Bottom observation system and supplementary observation system are respectively positioned on
Below focus, wherein supplementary observation system is located above near Sea Bottom observation system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379432A (en) * | 2020-10-09 | 2021-02-19 | 天津大学 | Small channel number portable hydrophone array acquisition system |
| CN112904428A (en) * | 2021-01-20 | 2021-06-04 | 上海遨菲克科技有限公司 | Ocean shallow stratum profile detection system and method |
| CN112987103A (en) * | 2021-02-08 | 2021-06-18 | 中海石油(中国)有限公司 | Seismic source device, marine exploration system and control method of controllable seismic source |
-
2019
- 2019-01-30 CN CN201920166436.6U patent/CN209433022U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379432A (en) * | 2020-10-09 | 2021-02-19 | 天津大学 | Small channel number portable hydrophone array acquisition system |
| CN112904428A (en) * | 2021-01-20 | 2021-06-04 | 上海遨菲克科技有限公司 | Ocean shallow stratum profile detection system and method |
| CN112904428B (en) * | 2021-01-20 | 2024-04-30 | 上海遨菲克科技有限公司 | Ocean shallow stratum profile detection system and method |
| CN112987103A (en) * | 2021-02-08 | 2021-06-18 | 中海石油(中国)有限公司 | Seismic source device, marine exploration system and control method of controllable seismic source |
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