CN101839996B - Synchronization method for collecting large-range seismic data - Google Patents
Synchronization method for collecting large-range seismic data Download PDFInfo
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- CN101839996B CN101839996B CN2009100806267A CN200910080626A CN101839996B CN 101839996 B CN101839996 B CN 101839996B CN 2009100806267 A CN2009100806267 A CN 2009100806267A CN 200910080626 A CN200910080626 A CN 200910080626A CN 101839996 B CN101839996 B CN 101839996B
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Abstract
The invention relates to a synchronization method for collecting large-range seismic data. A central controlling and recording unit sends out a command to appoint a collection station at the tail end of a measuring line; a time-delay calibration command is sent out by a cross station, the cross station sends out a TB pulse signal by a synchronization pin of an interface module, each collection station measures the time delay T1 of the collection station at the tail end of the measuring line, and the cross station takes a measurement result T1max from the return value of one station body which is closest to the cross station, and sends out a corrected value T2=1ms-Timax to each collection station; after the cross station sends out a TB pulse, each collection station carries out time delay by T1+T2 time after receiving the TB pulse and then uses the TB signal as a real data collection starting signal; all the collection stations use the TB signal which is sent out by the cross station as a reference and start data collection simultaneously in the subsequent time of 1ms; and the time error of the TB signal in each station body is 0.5 mu s.
Description
Technical field
The present invention relates to the method for synchronous of seismic instrument realization collecting large-range seismic data in a kind of extensive oil seismic exploration.
Background technology
Carry out on a large scale in the instrument of earthquake data acquisition, the normal at present method for synchronous that adopts has two kinds, 1) utilize the synchronization pulse of GPS to realize that instrument is synchronous, 2) utilize the method for constant time lag correction to realize that instrument is synchronous.These two kinds of methods all have the defective that self can't overcome.
Utilize the synchronization pulse of GPS to realize the synchronous method of instrument, in realization the physical environment that instrument is put is had higher requirement, instrument just can be put in the place that requirement must have gps signal to arrive.And can run into various rugged surroundings in the petroleum prospecting process, such as rivers, deep valley, forest and bridge etc., these local gps signals are difficult to cover.Even in the more smooth environment of physical features, gps signal also will be subjected to interference from outside signals such as weather, it is very unstable to become under thunderstorm weather, and institute is so that this method is very restricted.
Utilize the method for constant time lag correction to realize that the synchronous principle of instrument is, at first measure the time-delay characteristics of one section fixed length cables to signal, in the process of using,, the time-delay characteristics of system are revised then by the size of instrument according to institute's wiring cable length.This method implements fairly simple, but the error ratio of bringing is bigger.Because cable can change along with the variation of ambient temperature, humidity and the aging characteristics of cable own the transmission delay characteristic of signal, with a fixing value system is revised in the time-delay characteristics under the varying environment, can not obtain accurate result.
Summary of the invention
The purpose of this invention is to provide and a kind ofly utilize a pair of twisted-pair feeder in conjunction with FPGA (field programmable gate array), collecting large-range seismic data is carried out dynamic compensation, different cable transmission time-delay characteristics are made correction, the method for synchronous of the pre-demarcation of realization time-delay and the collecting large-range seismic data of synchronous acquisition.
When carrying out collecting large-range seismic data in the open air, the composition of total system and the transmission of data acquisition command are as follows.
(1) each acquisition station is provided with 4 earthquake data acquisition passages, connect 4 road wave detectors, after receiving the order that provides by central authorities control and record cell, begin to carry out earthquake data acquisition, and with the earthquake feeble signal that collects amplify, processings back packing such as filtering sends to intersect and stands.
(2) the intersection station is as the data exchange node of survey line and cross spider, has the secondary management function, all power supply station and acquisition stations on the management survey line, the packing data of the acquisition station collected is sent to central authorities' control and record cell, and each intersects big line interface connected in series acquisition station and the power supply station of station by both sides.
(3) central authorities control and record cell emphasis are finished each are intersected the Task Distribution management at station and collection, processing and the stored record work of geological data, and by intersecting the order to the acquisition station transmission data acquisition of both sides of standing.
The method for synchronous of interior earthquake data acquisition is implemented as follows on a large scale:
(1) after total system powered on fully, central authorities' control provided order with record cell, specifies the acquisition station of every survey line caudal end;
(2) central authorities control and record cell provide the time-delay demarcation and order by intersecting station, and the command channel of big line is switched to the demarcation state of delaying time;
(3) the intersection station provides a TB pulse signal by the synchronous pin of interface module, and each acquisition station is measured oneself time-delay T1 (T1max, T1 to survey line tail end acquisition station
2-T1
6, be referred to as T1), simultaneously to intersecting the result of the own measurement of station report, and with outcome record in own internal memory;
(4) intersecting station receives that the measurement result of all acquisition stations promptly thinks the Time delay measurement end;
(5) measurement result is taken out in the intersection station from the rreturn value of a station body at the most close intersection station, this measurement result is exactly the maximum delay T1max of the big line locking signal transmission of this section, intersecting stands provides a modified value T2=1ms-T1max to each acquisition station, when intersecting after the station provides the TB pulse, each acquisition station after receiving the TB pulse, all delay time the T1+T2 time again the TB signal as real data acquisition enabling signal;
(6) all acquisition station can be a benchmark to intersect the TB signal that station provide all, in 1ms while log-on data collection thereafter.
The effect of invention
Utilize said method that the synchronizing characteristics of system is tested, the synchronism detection system builds as shown in Figure 3, and wherein big line adopts 220M earthquake client cables.Use Agilent MSO6104A oscillograph test result as follows:
After doing compensation of delay, each body of standing is received the interior TB signal that TB order back produces.The time error of TB signal is about 0.5us in each body of standing.
The repeatedly stack of TB exists rocking of 0.5us to show between the TB in each time in each station.
Description of drawings
Fig. 1 is the seismic acquisition configuration general logical block diagram.
Fig. 2 is the synchronizing process of earthquake data acquisition.
Fig. 3 is that the synchronism detection system forms theory diagram.
Embodiment
System's tape track ability of this project is single line 2000 roads, and 500 horizontal acquisition stations of intersection station administration use following scheme to revise the transmission delay of data acquisition command, the initial moment that uniform data is gathered.
The method for synchronous of interior earthquake data acquisition is implemented as follows on a large scale:
1, after total system powered on fully, central authorities control provided order with record cell, specified the acquisition station (among Fig. 2 7) of every survey line caudal end.
2, central authorities control and record cell provide the demarcation order of delaying time by intersecting station (among Fig. 2), and the command channel of big line is switched to the demarcation state of delaying time.
3, the intersection station provides a TB by the synchronous pin of interface module
2Pulse signal, each acquisition station are measured oneself time-delay T1 (T1 as shown in Figure 2 to survey line tail end acquisition station
MAX,T1
2--T1
6, be referred to as T1).Simultaneously to intersecting the result of the own measurement of station report, and with outcome record in own internal memory.TB
1(Time Break) is a synchronizing pulse in the seismic prospecting, is used to do synchronous data collection.
4, intersecting station receives that the measurement result of all acquisition stations promptly thinks the Time delay measurement end.
5, measurement result is taken out in the intersection station from the rreturn value of a station body at the most close intersection station, and this measurement result is exactly the maximum delay T1max (as shown in Figure 2) of the big line locking signal transmission of this section.Intersecting stands provides a modified value T2 (T2=1ms-T1max) (as shown in Figure 2) to each acquisition station.During so real work, when intersecting after the station provides the TB pulse, each acquisition station after receiving the TB pulse, all delay time the T1+T2 time again the TB signal as real data acquisition enabling signal.
6, so all acquisition station can be a benchmark to intersect the TB signal that station provide all, in 1ms while log-on data collection thereafter.
After doing compensation of delay, each body of standing is received the interior TB signal that TB order back produces.The time error of TB signal is about 0.5us in each body of standing.
There is rocking of 0.5us in the repeatedly stack of TB between the TB in each time in each station.
Claims (1)
1. the method for synchronous of a collecting large-range seismic data, it is characterized in that: method for synchronous is implemented as follows:
Each acquisition station is provided with 4 earthquake data acquisition passages, connect 4 road wave detectors, after receiving the order that provides by central authorities control and record cell, begin to carry out earthquake data acquisition, and with the earthquake feeble signal that collects amplify, packing sends to and intersects the station after the Filtering Processing; The intersection station is as the data exchange node of survey line and cross spider, has the secondary management function, all power supply station and acquisition stations on the management survey line, the packing data of the acquisition station collected is sent to central authorities' control and record cell, and each intersects big line interface connected in series acquisition station and the power supply station of station by both sides; Central authorities control and record cell emphasis are finished each are intersected the Task Distribution management at station and collection, processing and the stored record work of geological data, and by intersecting the order to the acquisition station transmission data acquisition of both sides of standing;
(1) after total system powered on fully, central authorities' control provided order with record cell, specifies the acquisition station of every survey line caudal end;
(2) central authorities control and record cell provide the time-delay demarcation and order by intersecting station, and the command channel of big line is switched to the demarcation state of delaying time;
(3) the intersection station provides a TB pulse signal by the synchronous pin of interface module, and each acquisition station is measured oneself time-delay T1 to survey line tail end acquisition station, comprises T1max, T1
2-T1
6, be referred to as T1, simultaneously to intersecting the result of the own measurement of station report, and with outcome record in own internal memory;
(4) intersecting station receives that the measurement result of all acquisition stations promptly thinks the Time delay measurement end;
(5) measurement result is taken out in the intersection station from the rreturn value of a station body at the most close intersection station, this measurement result is exactly the maximum delay T1max of the big line locking signal transmission of this section, intersecting stands provides a modified value T2=1ms-T1max to each acquisition station, when intersecting after the station provides the TB pulse, each acquisition station after receiving the TB pulse, all delay time the T1+T2 time again the TB signal as real data acquisition enabling signal;
(6) all acquisition station can be a benchmark to intersect the TB signal that station provide all, in 1ms while log-on data collection thereafter.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102183785B (en) * | 2011-03-01 | 2013-05-08 | 吉林大学 | Multi-redundant synchronous data acquiring device and method of non-cable seismograph |
| CN102393531A (en) * | 2011-08-03 | 2012-03-28 | 中国石油天然气集团公司 | Data transmission system for seismic exploration |
| CN102508297B (en) * | 2011-10-08 | 2013-06-26 | 天津大学 | Accurate measurement and correction method and device of synchronous acquisition time errors of multiple codes |
| CN103064108B (en) * | 2012-12-25 | 2016-03-02 | 中国海洋石油总公司 | A kind of system and method for marine seismic data synchronous acquisition |
| CN103067152A (en) * | 2012-12-26 | 2013-04-24 | 中国海洋石油总公司 | Method and system of clock distributing in ocean seismic survey system |
| CN107884814B (en) * | 2017-12-15 | 2023-08-25 | 合肥国为电子有限公司 | High-channel consistency seismic prospecting instrument and command execution delay time calculating method thereof |
| CN112711075B (en) * | 2019-10-25 | 2024-03-26 | 中国石油天然气集团有限公司 | Clock calibration system of marine seismic node |
| CN111193569A (en) * | 2019-12-30 | 2020-05-22 | 中国兵器装备集团自动化研究所 | Method and system for correcting relay communication delay time |
| CN112785828B (en) * | 2020-12-14 | 2022-04-22 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Seismic exploration system and method with wireless communication and wired network mixed |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873961A (en) * | 1973-09-06 | 1975-03-25 | Shell Oil Co | Method and apparatus for synchronizing modular seismic system |
| EP1087240A1 (en) * | 1999-09-27 | 2001-03-28 | Institut Francais Du Petrole | Method and system of standard transmission for linking together the elements of a seismic device |
| WO2003091750A2 (en) * | 2002-04-24 | 2003-11-06 | Ascend Geo, Llc | Methods and systems for acquiring seismic data |
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2009
- 2009-03-20 CN CN2009100806267A patent/CN101839996B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873961A (en) * | 1973-09-06 | 1975-03-25 | Shell Oil Co | Method and apparatus for synchronizing modular seismic system |
| EP1087240A1 (en) * | 1999-09-27 | 2001-03-28 | Institut Francais Du Petrole | Method and system of standard transmission for linking together the elements of a seismic device |
| WO2003091750A2 (en) * | 2002-04-24 | 2003-11-06 | Ascend Geo, Llc | Methods and systems for acquiring seismic data |
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