CN103064108A - System and method of synchronous acquisition of ocean seismic data - Google Patents
System and method of synchronous acquisition of ocean seismic data Download PDFInfo
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- CN103064108A CN103064108A CN2012105730764A CN201210573076A CN103064108A CN 103064108 A CN103064108 A CN 103064108A CN 2012105730764 A CN2012105730764 A CN 2012105730764A CN 201210573076 A CN201210573076 A CN 201210573076A CN 103064108 A CN103064108 A CN 103064108A
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Abstract
The invention discloses a system and a method of synchronous acquisition of ocean seismic data, the method of the synchronous acquisition of the ocean seismic data includes: a shipborne control platform sending a main clock to a marine seismic streamer interface board; the marine seismic streamer interface board receiving the main clock and distributing the main clock to all digital packets on the marine seismic streamer in sequence through a command data channel; when the shipborne control platform sends commands to the digital packets on the marine seismic streamer to trigger signals through the marine seismic streamer interface board, and the digital packets delaying clocks in the digital packets according to the delay compensating parameter delta t and enabling the times at which all the digital packets to execute the commands sent by the shipborne control platform to be identical. The problems that clock frequency of the digital packets in a distributed ocean seismic survey system is inconsonant and data acquisition is affected due to the fact that the acquisition times of seismic data are inconsonant are solved.
Description
Technical field
The present invention relates to a kind of data acquisition technology, particularly, relate to a kind of system and method for marine seismic data synchronous acquisition.
Background technology
The offshore seismic exploration system is comprised of one to multiple underwater cable, and every cable partly is in series by deck cable, optical fiber lead-in cable, active section, digital packets and tail target etc.Wherein, active section is one of core component of submarine system, places equally spacedly therein a large amount of nautical receiving set (single or array configuration), thereby forms a sensor array that huge area coverage is arranged.Fig. 1 is the typical structure of distributed work section.In the distributed towing cable active section of this kind, collection plate is placed in the cable equally spacedly, the every digitized processing of being responsible for 4 passage nautical receiving set signals, the signal after the digitizing by local RS485 protocol transmission on digital packets.All digital packets of submarine system are all carried out cascade by high-speed serial channel, thereby guarantee that the data of all collection plates can upload to [10,11] in the boat-carrying register system step by step by digital packets under water.Therefore, digital packets plays a part three aspects, and namely power distribution and Data Collection, the data of the physical connection between active section, local 8 collection plates are uploaded step by step and ordered step by step and issue.
Distributed active section towing cable structure so that the transmission range of nautical receiving set simulating signal reduces greatly, thereby extremely is conducive to the high-quality transmission of signal.Simultaneously because the signal of transmission is the data after the digitizing entirely, the local transmission of simulating signal within being limited to active section, therefore the overall channel of the whole piece underwater towing line scale of counting has just been determined by the transmittability of digital signal and the power supply capacity of power-supply system fully, thereby has greatly improved the tape track ability of single cable.This distributed frame is a kind of two-level pipeline data transmission structure, and it has brought trouble to system synchronization also when this data transmission offers convenience.
Fig. 2 has schematically represented the collection sequential of distributed marine seismic data acquisition system (DAS).With regard to the wall scroll cable, its boat-carrying towing cable interface board can pass to the trigger pip (TB:time break, this signal and air gun source system synchronization have represented the moment that source signal excites) of whole system down on each digital packets of submarine system step by step.Digital packets can be transferred to it local collection plate module after receiving this trigger command.Final collection plate front-end A/D C module can just can return to digitized signal digital packets and carry out the streamline transmission after receiving this trigger pip.This shows, whole order down biography process is divided into a lot of subprocess, each process all can apply certain delay to the transmission of order, thereby finally produces the result of three aspects:: the one, and the moment that the front end digital module receives trigger pip can be departed from real TB and be occured constantly; The 2nd, can be offset when receiving TB between each collection plate, there is larger otherness; The 3rd is that Synchronous Receiving had no idea to be protected with the moment of carrying out the TB order between many cables.And these all are by distributed towing cable framework adverse effect, want the real distributed large-scale offshore seismic exploration system that realizes, must solve these technical barriers and challenge.
Summary of the invention
In order to solve the problems of the technologies described above, to the invention provides the inconsistent and earthquake data acquisition Time Inconsistency of a kind of clock frequency that can solve digital packets in the distributed ocean seismic exploration system and affect the problem of data acquisition.
The method of marine seismic data synchronous acquisition disclosed by the invention comprises:
The boat-carrying control desk sends major clock to the towing cable interface board;
Described towing cable interface board receives described major clock, and by the order data passage described major clock is distributed to all digital packets on the towing cable successively;
When described boat-carrying control desk when digital packets sends the command triggers signal on the towing cable by described towing cable interface board, described digital packets postpones the clock in the described digital packets according to delay compensation parameter Δ t, and it is identical to make digital packets all on the towing cable carry out moment of the order that described boat-carrying control desk sends.
Preferably, the described delay compensation parameter Δ t in each digital packets obtains in such a way on the towing cable:
Described boat-carrying control desk sends synchronization delay compensation order by high-speed serial channel to the towing cable interface board;
Described towing cable interface board receives described synchronization delay compensation order, and is distributed to successively all digital packets on the towing cable by passing down the command channel;
After the tail bag on the towing cable receives described synchronization delay compensation order, described synchronization delay compensation order is passed through each digital packets winding to described towing cable interface board successively by the uploading data passage;
Measure each digital packets and detect the time t1 of described synchronization delay compensation order and the time t2 that detects described synchronization delay compensation order from the uploading data passage from passing down the command channel;
Latch mistiming t2-t1, and calculate described delay compensation parameter Δ t=(t2-t1)/2.
Preferably, described calculate described delay compensation parameter Δ t after, upload to described boat-carrying control desk by the uploading data passage.
Preferably, when the digital packets on the described towing cable is carried out the order that described boat-carrying control desk passes down, described order is fanned out to collection plate.
The invention also discloses a kind of marine seismic data synchronous, comprising:
Be arranged in the boat-carrying control desk:
The major clock sending module is used for sending the order data that embeds major clock to the towing cable interface board;
And be arranged at the towing cable interface board:
Major clock recovers module, for the order data of the embedding major clock that receives described boat-carrying control desk transmission, and recovers described major clock;
The major clock sending module is for all digital packets that the described major clock that recovers sent to successively towing cable by passing down the command channel;
And be arranged at each digital packets:
Major clock recovers module, is used for receiving order data, and recovers the major clock in the order data;
The clock delay module is used for according to delay compensation parameter Δ t the described major clock that recovers being postponed;
Command execution module, the clock after being used for postponing according to described clock delay module is carried out the order that described boat-carrying control desk passes down, and it is identical to make digital packets all on the towing cable carry out moment of the order that described boat-carrying control desk sends.
Preferably, described system also comprises the delay compensation parameter measurement unit, and described delay compensation parameter measurement unit comprises:
Be arranged in the boat-carrying control desk:
Delay compensation order sending module is used for sending synchronization delay compensation order by high-speed serial channel to the towing cable interface board;
And be arranged in the towing cable interface board:
The first delay compensation order receiver module is used for receiving the synchronization delay compensation order that described boat-carrying control desk sends;
Delay compensation order sending module, the described synchronization delay compensation order that is used for receiving sends to all digital packets of towing cable successively by passing down the command channel;
The second delay compensation order receiver module is used for receiving the described synchronization delay compensation order that the digital packets on the towing cable is uploaded by the uploading data passage.
And be arranged in each digital packets:
The first delay compensation order receiver module is used for receiving described towing cable interface board or higher level's digital packets by passing down the synchronization delay compensation order of command channel transmission;
The first delay compensation order sending module, the described synchronization delay compensation that is used for receiving order by under pass the command channel and send to subordinate's digital packets;
The second delay compensation order receiver module is used for receiving the synchronization delay compensation order that subordinate's digital packets is uploaded by the uploading data passage;
The second delay compensation order sending module is used for the described synchronization delay compensation order that the subordinate's digital packets that receives is uploaded is uploaded to higher level's digital packets or towing cable interface board by the uploading data passage;
The time measurement module is used for measuring each digital packets and detects the time t1 of described synchronization delay compensation order and the time t2 that detects described synchronization delay compensation order from the uploading data passage from passing down the command channel;
Latch module is used for latching mistiming t2-t1, calculates described delay compensation parameter Δ t=(t2-t1)/2, and calculated value is sent to described clock delay module;
Wherein, in the above-mentioned module, the tail bag includes only the first delay compensation order receiver module, described tail bag also comprises order winding module, be used for after receiving described synchronization delay compensation order, described synchronization delay compensation order being passed through each digital packets winding to described towing cable interface board successively by the uploading data passage.
Preferably, described delay compensation parameter measurement unit also comprises:
Transmission module on the parameter is used for calculating described delay compensation parameter and uploading to described boat-carrying control desk by the uploading data passage described.
Preferably, described system also comprises:
The order fan-out modular is used for when described command execution module is carried out the order that passes under the described boat-carrying control desk described order being fanned out to collection plate.
The present invention can eliminate the cumulative effect of each collection plate operating error, finishes whole system-level synchronous acquisition on a large scale.
Description of drawings
Fig. 1 is the structural drawing of distributed marine seismic survey system in the prior art;
Fig. 2 is distributed marine seismic survey system earthquake data acquisition sequential chart in the prior art;
Fig. 3 is the system chart of marine seismic data synchronous acquisition in the embodiment of the invention;
Fig. 4 is the structured flowchart of delay compensation parameter measurement unit in the embodiment of the invention;
Fig. 5 is the method flow diagram of marine seismic data synchronous acquisition in the embodiment of the invention;
Fig. 6 is delay compensation measurement method of parameters process flow diagram in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing preferential embodiment of the present invention is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, but be not used in restriction the present invention.
The present invention is described in further detail below in conjunction with accompanying drawing.
Among the device embodiment disclosed by the invention, provide a kind of system of marine seismic data synchronous acquisition, as shown in Figure 3, having comprised:
Be arranged in the boat-carrying control desk:
The major clock sending module is used for sending the order data that embeds major clock to the towing cable interface board;
And be arranged at the towing cable interface board:
Major clock recovers module, is used for the order data of the embedding major clock of reception boat-carrying control desk transmission, and recovers major clock;
The major clock sending module is for all digital packets that the major clock that recovers sent to successively towing cable by passing down the command channel;
And be arranged at each digital packets:
Major clock recovers module, is used for receiving order data, and recovers the major clock in the order data;
The clock delay module is used for according to delay compensation parameter Δ t the described major clock that recovers being postponed;
Command execution module, the clock after being used for postponing according to the clock delay module is carried out the order that the boat-carrying control desk passes down, and it is identical to make digital packets all on the towing cable carry out moment of the order that the boat-carrying control desk sends.
Present embodiment has solved the synchronous execution of synchronous clock distribution and order, but because distributed streamer data gathers structure, the order of this moment also is not delivered to the front-end collection plate, has only arrived digital packets.Be head it off, can in digital packets, will receive order and fan out to collection plate by the RS485 protocol synchronization, because digital packets work clock and command execution are finished constantly synchronously, obviously the fan-out order can synchronously arrive collection plate and finish synchronous execution.Therefore, each collection plate adopts the not local work clock of homology, but begin in system under the control of acquisition, and in the moment that each time TB order produces, capital re-synchronization collection once, thereby can eliminate the cumulative effect of each collection plate operating error, and finally finish whole system-level synchronous acquisition on a large scale.
Among another device embodiment disclosed by the invention, provide a kind of delay compensation parameter measurement unit, can obtain the synchronization delay compensating parameter, as shown in Figure 4, having comprised:
Be arranged in the boat-carrying control desk:
Delay compensation order sending module is used for sending synchronization delay compensation order (SDC:Synchronization Delay Compensation) by high-speed serial channel to the towing cable interface board;
And be arranged in the towing cable interface board:
The first delay compensation order receiver module is used for receiving the synchronization delay compensation order that the boat-carrying control desk sends;
Delay compensation order sending module is used for all digital packets that send to successively towing cable by passing down the command channel are ordered in the synchronization delay compensation that receives;
The second delay compensation order receiver module is used for receiving the synchronization delay compensation order that the digital packets on the towing cable is uploaded by the uploading data passage.
And be arranged in each digital packets:
The first delay compensation order receiver module is used for receiving towing cable interface board or higher level's digital packets by passing down the synchronization delay compensation order of command channel transmission;
The first delay compensation order sending module, be used for the synchronization delay compensation order that will receive by under pass the command channel and send to subordinate's digital packets;
The second delay compensation order receiver module is used for receiving the synchronization delay compensation order that subordinate's digital packets is uploaded by the uploading data passage;
The second delay compensation order sending module, the synchronization delay compensation order that is used for the subordinate's digital packets that receives is uploaded is uploaded to higher level's digital packets or towing cable interface board by the uploading data passage;
The time measurement module is used for measuring each digital packets and detects the time t1 of synchronization delay compensation order and the time t2 that detects synchronization delay compensation order from the uploading data passage from passing down the command channel;
Latch module is used for latching mistiming t2-t1, computing relay compensating parameter Δ t=(t2-t1)/2, and calculated value sent to the clock delay module;
Wherein, in the above-mentioned module, the tail bag includes only the first delay compensation order receiver module, and the tail bag also comprises order winding module, be used for after receiving synchronization delay compensation order, synchronization delay compensation order being passed through each digital packets winding to the towing cable interface board successively by the uploading data passage.
Wherein, the time measurement module can be used high-frequency counter, and the value of latch module both can be write by high-frequency counter, also can write by the configuration parameter that receives the boat-carrying control desk.Therefore before work, all carry out the measuring process of synchronization delay compensating parameter complicated and consuming time for fear of submarine system, when measuring the synchronization delay compensating parameter, by transmission module on the parameter this parameter is uploaded to the boat-carrying control desk by data channel, thereby can record the running parameter as system.When system re-powers work, just can directly obtain the synchronization delay compensating parameter by the boat-carrying control desk like this.
In the embodiment of the method disclosed by the invention, provide the method for marine seismic data synchronous acquisition, as shown in Figure 5, having comprised:
S01, boat-carrying control desk send major clock to the towing cable interface board;
S02, towing cable interface board receive major clock, and by the order data passage major clock are distributed to all digital packets on the towing cable successively;
S03, when boat-carrying control desk when digital packets sends the command triggers signal on the towing cable by the towing cable interface board, digital packets postpones the clock in the digital packets according to delay compensation parameter Δ t, and it is identical to make digital packets all on the towing cable carry out moment of the order that the boat-carrying control desk sends.
As further improvement of this embodiment, when digital packets on the towing cable is carried out the order that the boat-carrying control desk passes down, order is fanned out to collection plate, thereby can eliminate the cumulative effect of each collection plate operating error, and finally finish whole system-level synchronous acquisition on a large scale.
In another embodiment of the method disclosed by the invention, provide a kind of delay compensation measurement method of parameters, can obtain the synchronization delay compensating parameter, as shown in Figure 6, having comprised:
S11, boat-carrying control desk send synchronization delay compensation order by high-speed serial channel to the towing cable interface board;
S12, towing cable interface board receive synchronization delay compensation order, and are distributed to successively all digital packets on the towing cable by passing down the command channel;
S13, after the tail bag on the towing cable receives synchronization delay compensation order, synchronization delay compensation order is passed through each digital packets winding to the towing cable interface board successively by the uploading data passage;
S14, measure each digital packets and detect the time t1 of synchronization delay compensation order and the time t2 that detects synchronization delay compensation order from the uploading data passage from passing down the command channel;
S15, latch mistiming t2-t1, and computing relay compensating parameter Δ t=(t2-t1)/2.
Before work, all carry out the measuring process of synchronization delay compensating parameter complicated and consuming time for fear of submarine system, when measuring the synchronization delay compensating parameter, this parameter is uploaded to the boat-carrying control desk by data channel, thereby can record the running parameter as system.When system re-powers work, just can directly obtain the synchronization delay compensating parameter by the boat-carrying control desk like this.
Claims (8)
1. the method for a marine seismic data synchronous acquisition is characterized in that, comprising:
The boat-carrying control desk sends major clock to the towing cable interface board;
Described towing cable interface board receives described major clock, and by the order data passage described major clock is distributed to all digital packets on the towing cable successively;
When described boat-carrying control desk when digital packets sends the command triggers signal on the towing cable by described towing cable interface board, described digital packets postpones the clock in the described digital packets according to delay compensation parameter Δ t, and it is identical to make digital packets all on the towing cable carry out moment of the order that described boat-carrying control desk sends.
2. the method for claim 1, it is characterized in that: the described delay compensation parameter Δ t on the towing cable in each digital packets obtains in such a way:
Described boat-carrying control desk sends synchronization delay compensation order by high-speed serial channel to the towing cable interface board;
Described towing cable interface board receives described synchronization delay compensation order, and is distributed to successively all digital packets on the towing cable by passing down the command channel;
After the tail bag on the towing cable receives described synchronization delay compensation order, described synchronization delay compensation order is passed through each digital packets winding to described towing cable interface board successively by the uploading data passage;
Measure each digital packets and detect the time t1 of described synchronization delay compensation order and the time t2 that detects described synchronization delay compensation order from the uploading data passage from passing down the command channel;
Latch mistiming t2-t1, and calculate described delay compensation parameter Δ t=(t2-t1)/2.
3. method as claimed in claim 2 is characterized in that: described calculate described delay compensation parameter Δ t after, upload to described boat-carrying control desk by the uploading data passage.
4. such as claim 1,2 or 3 described methods, it is characterized in that: when the digital packets on the described towing cable is carried out the order that described boat-carrying control desk passes down, described order is fanned out to collection plate.
5. a marine seismic data synchronous is characterized in that, comprising:
Be arranged in the boat-carrying control desk:
The major clock sending module is used for sending the order data that embeds major clock to the towing cable interface board;
And be arranged at the towing cable interface board:
Major clock recovers module, for the order data of the embedding major clock that receives described boat-carrying control desk transmission, and recovers described major clock;
The major clock sending module is for all digital packets that the described major clock that recovers sent to successively towing cable by passing down the command channel;
And be arranged at each digital packets:
Major clock recovers module, is used for receiving order data, and recovers the major clock in the order data;
The clock delay module is used for according to delay compensation parameter Δ t the described major clock that recovers being postponed;
Command execution module, the clock after being used for postponing according to described clock delay module is carried out the order that described boat-carrying control desk passes down, and it is identical to make digital packets all on the towing cable carry out moment of the order that described boat-carrying control desk sends.
6. system as claimed in claim 5 is characterized in that, described system also comprises the delay compensation parameter measurement unit, and described delay compensation parameter measurement unit comprises:
Be arranged in the boat-carrying control desk:
Delay compensation order sending module is used for sending synchronization delay compensation order by high-speed serial channel to the towing cable interface board;
And be arranged in the towing cable interface board:
The first delay compensation order receiver module is used for receiving the synchronization delay compensation order that described boat-carrying control desk sends;
Delay compensation order sending module, the described synchronization delay compensation order that is used for receiving sends to all digital packets of towing cable successively by passing down the command channel;
The second delay compensation order receiver module is used for receiving the described synchronization delay compensation order that the digital packets on the towing cable is uploaded by the uploading data passage.
And be arranged in each digital packets:
The first delay compensation order receiver module is used for receiving described towing cable interface board or higher level's digital packets by passing down the synchronization delay compensation order of command channel transmission;
The first delay compensation order sending module, the described synchronization delay compensation that is used for receiving order by under pass the command channel and send to subordinate's digital packets;
The second delay compensation order receiver module is used for receiving the synchronization delay compensation order that subordinate's digital packets is uploaded by the uploading data passage;
The second delay compensation order sending module is used for the described synchronization delay compensation order that the subordinate's digital packets that receives is uploaded is uploaded to higher level's digital packets or towing cable interface board by the uploading data passage;
The time measurement module is used for measuring each digital packets and detects the time t1 of described synchronization delay compensation order and the time t2 that detects described synchronization delay compensation order from the uploading data passage from passing down the command channel;
Latch module is used for latching mistiming t2-t1, calculates described delay compensation parameter Δ t=(t2-t1)/2, and calculated value is sent to described clock delay module;
Wherein, in the above-mentioned module, the tail bag includes only the first delay compensation order receiver module, described tail bag also comprises order winding module, be used for after receiving described synchronization delay compensation order, described synchronization delay compensation order being passed through each digital packets winding to described towing cable interface board successively by the uploading data passage.
7. system as claimed in claim 6, it is characterized in that: described delay compensation parameter measurement unit also comprises:
Transmission module on the parameter is used for calculating described delay compensation parameter and uploading to described boat-carrying control desk by the uploading data passage described.
8. such as claim 5,6 or 7 described methods, it is characterized in that: described system also comprises:
The order fan-out modular is used for when described command execution module is carried out the order that passes under the described boat-carrying control desk described order being fanned out to collection plate.
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| CN106291752A (en) * | 2015-05-25 | 2017-01-04 | 云南航天工程物探检测股份有限公司 | Seismic detector system delay testing method |
| CN106372020A (en) * | 2016-08-27 | 2017-02-01 | 天津大学 | High-speed long-distance transmission system of marine seismic data |
| CN109413733A (en) * | 2018-10-24 | 2019-03-01 | 济南格林信息科技有限公司 | Sensing network information collection synchronizes calibration method, gateway, sensing node and system |
| CN110716232A (en) * | 2019-08-23 | 2020-01-21 | 自然资源部第一海洋研究所 | Marine seismic cable and working section thereof |
| CN114114423A (en) * | 2022-01-28 | 2022-03-01 | 中海油田服务股份有限公司 | Marine seismic streamer equipment and method capable of providing tension and water stack information |
| CN115159377A (en) * | 2022-07-12 | 2022-10-11 | 海南银升海洋工程科技有限公司 | Stepless speed change winch and intelligent meter counter |
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| CN110716232A (en) * | 2019-08-23 | 2020-01-21 | 自然资源部第一海洋研究所 | Marine seismic cable and working section thereof |
| CN114114423A (en) * | 2022-01-28 | 2022-03-01 | 中海油田服务股份有限公司 | Marine seismic streamer equipment and method capable of providing tension and water stack information |
| CN115159377A (en) * | 2022-07-12 | 2022-10-11 | 海南银升海洋工程科技有限公司 | Stepless speed change winch and intelligent meter counter |
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| CN103064108B (en) | 2016-03-02 |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |