CN103852783B - A kind of submarine cable seismic prospecting observation system - Google Patents
A kind of submarine cable seismic prospecting observation system Download PDFInfo
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- CN103852783B CN103852783B CN201210505753.9A CN201210505753A CN103852783B CN 103852783 B CN103852783 B CN 103852783B CN 201210505753 A CN201210505753 A CN 201210505753A CN 103852783 B CN103852783 B CN 103852783B
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- excite
- observation system
- shot point
- arrangement
- big gun
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Abstract
The present invention is a kind of submarine cable seismic prospecting observation system method for designing, utilize the lower-cost feature of air gun source earthquake-wave-exciting, by rational shot point and a reception point relational design, excite in the middle of the longitudinal direction of the former orthogonal observation system of wire harness shape, bilateral arrangement receives mode and changes that longitudinal arrangement two ends excite, single ender receives mode into, and air gun source excites to count and doubles.Shot point position is not repeated, and the shot point involved by a big gun line completes in one flight number of air gun source ship.Compared with former observation system, record number of channels is reduced to 1/2nd of former observed pattern, complete identical workload, can reduce former observed pattern 1/2nd equipment investment total amount, decrease bottom cable laying and recovery, geophone station positioning operation workload 33.3% simultaneously；In the case of same instruments resource input, can complete effectively to excite big gun number to double, instrument resource efficiency doubles.
Description
Technical field
The present invention relates to geophysical prospecting for oil technology, be a kind of sea being applied to offshore oil seismic exploration
End cable seismic prospecting observation system.
Background technology
Exciting track group recording geometry in the middle of arrangement is that current submarine cable (OBC) technology carries out offshore oil
One of observation system that seismic prospecting is conventional.Adopt and carry out seismic prospecting in this way, it is generally required to put into
More geological data receives number of channels (cymoscope).Such as, for reception channel spacing be 50 meters,
Big vertical misalignment away from for the observation system of 4975 meters, use in the middle of the observed pattern that excites, wall scroll arranges
Need 2*100 road.If using arrangement two ends to excite, wall scroll arrangement Zhi Xu 100 road sets with regard to meeting
Meter requirement, but shot point excites workload to add 1 times.
For the seismic prospecting of land, during OBC seismic prospecting, the submarine cable of input and
Relevant device is relatively costly, and the laying of submarine cable simultaneously and recovery, geophone station positioning action difficulty are big.
And the efficiency of air gun source earthquake-wave-exciting is high, cost is relatively low, this is owing to air gun source ship is along arrangement
Direction carries out air gun and excites the efficiency of operation to be determined by energy source boat headway, and therefore 100 meters excite 1
It is identical that big gun and 100 meters excite the time used by 2 big guns (50 meter of 1 big gun).How to utilize OBC earthquake
The efficiency of air gun source earthquake-wave-exciting feature high, lower-cost in exploration process, in satisfied exploration
On the premise of requirement, designed by rational observation system, reasonably increase air gun and excite workload,
It is effectively reduced to shake the input of data receiver number of channels, improves instrument resource efficiency, and then reduction is explored into
This, be one of key issue that OBC seismic prospecting is to be solved.
Summary of the invention
Present invention aim at providing one be applicable for use with track group recording geometry observation and longitudinally need many
The submarine cable seismic prospecting observation system of secondary arrangement.
The present invention is achieved through the following technical solutions:
1, the centre that the longitudinal two ends of arrangement excite, single ender receives is used to excite track group recording geometry to see
Survey mode；
2, the odd-multiple that distance is longitudinal shot interval between the big gun of arrangement two ends two, simultaneously between the big gun of two ends two
Distance not less than maximum vertical misalignment away from；
3, when increasing geophone station between two big guns, geophone station is increased at shot point opposite side, to ensure longitudinally
Degree of covering is consistent；
4, carry out shot point laying according to above-mentioned requirements, during air gun source ship operation, in a flight number, complete 1
Bar big gun line excites operation.
The present invention utilizes the efficiency feature high, lower-cost of air gun source earthquake-wave-exciting, by closing
Reason design shot point and reception point, double air gun source shot point (big gun number), receive arrangement road
Number reduces by about one time, decreases laying and recovery, the geophone station positional operand of instrument and equipment, submarine cable
Make relatively costly operation, improve working performance simultaneously.Refer to table 1.
Track group recording geometry is excited in the middle of table 1.
Two ends longitudinal with arrangement excite single ender to receive resource efficiency contrast table
In table, data show:
1, the present invention excites observation system for 8 line 4 big gun 3200 roads are middle, and lay 5400 road is arranged
Row, can complete 400 gun excitations.8 longitudinal direction two ends, line 4 big gun 1632 road are used to excite observation system, lay
3672 road arrangements, can complete 400 gun excitations, but reduce by 1728 road instrument resource usage amounts；
2, exciting observation system for 8 longitudinal direction two ends, line 4 big gun 1632 road, lay 5436 road arranges, and throws
Enter instrument number of channels and increase by 72 roads, 1600 big gun collections can be completed, convert into 1 big gun by 2 big guns and calculate, can complete
Equivalence big gun 800 big gun, completing workload increases by 1 times, i.e. instrument resource efficiency improves nearly 1 times；
3, the present invention is as a example by the work area that longitudinal length is 25 kilometers, uses 8 line 3200 roads middle
Exciting observation system, an arranging line needs folding and unfolding 600*3=1800 road/time (see Fig. 5), arrangement to remove greatly
Family 2 times.Using 8 longitudinal direction two ends, line 1632 road to excite observation system, an arranging line needs folding and unfolding
600*2=1200 road/time (see Fig. 6), reduces arrangement workload 33.3%, reduces by the row of 33.3% on year-on-year basis
Row maintenance workload (geophone station positions, partially puts rectification, electric leakage rectification)；The big removal of home of arrangement 1 time, phase
To reducing the big removal of home of arrangement 1 time；Reduce air gun to turn around workload 33.3% of reaching the standard grade, but increase air gun source ship
Distance to go increases 5/25=20%.Generally, the air gun on-line time that turns around accounts for the 12% of total operation time
Left and right, air gun excites the activity duration to account for about the 40% of total operation time, when arrangement maintenance time accounts for total operation
Between about 12%, the influence time such as trend At All Other Times.The arrangement big removal of home 1 day time of 1 need, air gun
Reach the standard grade and turn around, arrange maintenance and can save (12%+12%) * 33.3%=7.92% total operation time, reduce 1 day
Arrange big moving time, increase air gun total operation time 1/22 (monthly effectively working day is 22 days)=4.5%,
The saving of above-mentioned time can directly increase air gun effective operation time 7.92%+4.5%=12.42% and (account for total operation
The percentage ratio of time), air gun source ship distance to go increase accounts for total operation time 40%*20%=8%, actual
Increase air gun effective operation time 12.42%-8%=4.42% (accounting for the percentage ratio of total operation time), i.e. air gun
Working performance can improve 4.42%/40%=11%.
4, considering, the present invention, for longitudinally need to repeatedly fall the work area arranged, uses longitudinal end points to excite
Observation system can reduce arrangement workload (folding and unfolding, maintenance) 33.3%, indirectly adds air gun source effective
Between man-hour, can further improve synthetic job efficiency.
Accompanying drawing explanation
Fig. 1 arranges longitudinal two ends simply and excites and cause shot point to repeat；
Fig. 2 arranges longitudinal two ends and excites observation system template；
Fig. 3 arranges longitudinal two ends and excites observation system；
The design of Fig. 4 application drawing 2 observation system template excites shot point；
Fig. 5 applies and excites observation system collection arrangement and air gun to excite signal in the middle of 8 line 3200 roads longitudinal directions
Figure；
Fig. 6 applies 8 longitudinal direction two ends, line 1632 road to excite observation system collection arrangement and air gun to excite signal
Figure.
Detailed description of the invention
1, the centre that the longitudinal two ends of arrangement excite, single ender receives is used to excite track group recording geometry to see
Survey mode (see Fig. 1).In Fig. 1, dotted line represents geophone station, and round dot represents shot point.8 of figure middle and upper part
Dotted line represents two arranging lines of longitudinal shot interval 100 meters and 50 meters respectively with 16 dotted lines of bottom,
For purposes of illustration only, figure represents with 16 phantom line segments with 8 respectively.When left end shot point excites, the right is arranged
Row receive, and when the right shot point excites, left side arrangement receives.It can be seen that arrange two simply
End excites, monolateral reception can cause longitudinal shot point to repeat (see Fig. 1), and shot point repeats to cause air gun source ship
Need two flight numbers just can complete to excite operation；
2, in order to solve, longitudinal shot point repeats, air gun source ship can not complete to excite problem in a flight number,
Needing to lay shot point to be adjusted, the method for adjustment is the distance arranged between the big gun of two ends two to be designed as
The odd-multiple of longitudinal shot interval, simultaneously the distance between the big gun of two ends two not less than maximum vertical misalignment away from (see
Fig. 2).With shot interval 100 meters, road spacing 25 meters, maximum vertical misalignment away from 4987.5 meters of observation systems
As a example by, using middle mode of excitation, shot point two ends respectively need 200 geophone stations to receive, and use arrangement two ends
Excite single ender to receive, need 200 geophone stations.Geophone station quantity owing to receiving reduces 1 times, covers
Lid number of times will reduce 1 times, for realizing identical degree of covering, need to increase the shot point quantity of 1 times, because of
When this uses arrangement two ends to excite single ender to receive, need to encrypt shot point, shot interval is subtracted by 100 meters
Little to 50 meters.After encryption shot point, for making shot point not repeat, same reception arranges between the big gun of section two ends two
Distance should be the odd-multiple of 50 meters.For maximum vertical misalignment away from for 4987.5 meters of observation systems, arrangement
Distance between the big gun of two ends two should be adjusted to 5050 meters, and 5050 meters/50 meters=201, i.e. in the same row of reception
Increase by 2 geophone stations between the big gun of row section two ends two, count 202 geophone stations；
3, when increasing geophone station between two big guns, increase corresponding detection at shot point opposite side and count, with
Ensure that longitudinally covered number of times is consistent (see Fig. 3).For above-mentioned observation system, for ensureing longitudinally covered number of times
Unanimously, needing to increase by 2 geophone stations at shot point opposite side, i.e. one receives the total detection of arrangement and counts is 204
Individual；
4, for longitudinal direction two ends, work area, according to design needs, can use normally roll into, roll out mode supplement
Excite shot point.Arrangement connecting part is rolled for longitudinal arrangement, use monolateral roll out, monolateral roll into swash
Originating party formula (see Fig. 4).Joining part air gun source need to repeat a flight number (see Fig. 6)；
5, starting to be carried out continuously shot point according to above-mentioned requirements from arrangement one end and lay (see Fig. 4), air gun shakes
In a flight number, complete 1 big gun line during the ship operation of source excite operation.
Claims (1)
1. a submarine cable seismic prospecting observation system, feature is to be achieved through the following technical solutions:
1) centre that the longitudinal two ends of arrangement excite, single ender receives is used to excite track group recording geometry to see
Survey mode；
2) odd-multiple that distance is longitudinal shot interval between the big gun of arrangement two ends two, simultaneously between the big gun of two ends two
Distance not less than maximum vertical misalignment away from；
3) when increasing geophone station between two ends two big gun of shot point side, detection is increased at shot point opposite side
Point, consistent to ensure longitudinally covered number of times；
4) carry out shot point laying according to above-mentioned requirements, during air gun source ship operation, in a flight number, complete 1
Bar big gun line excites operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505753.9A CN103852783B (en) | 2012-11-30 | 2012-11-30 | A kind of submarine cable seismic prospecting observation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210505753.9A CN103852783B (en) | 2012-11-30 | 2012-11-30 | A kind of submarine cable seismic prospecting observation system |
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| Publication Number | Publication Date |
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| CN103852783A CN103852783A (en) | 2014-06-11 |
| CN103852783B true CN103852783B (en) | 2016-08-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104111478B (en) * | 2014-07-08 | 2017-08-25 | 中国石油集团东方地球物理勘探有限责任公司 | A kind of three-dimensional wide-azimuth seismic prospecting observation system design method of submarine cable |
| CN105388517A (en) * | 2015-10-21 | 2016-03-09 | 中国海洋石油总公司 | Orthogonal beam line observation system for offshore three-dimensional seismic exploration |
| CN105467460B (en) * | 2015-12-28 | 2018-01-05 | 中国石油天然气集团公司 | electromagnetic exploration method and device |
| CN108020864B (en) * | 2017-12-29 | 2023-09-12 | 中国电建集团华东勘测设计研究院有限公司 | Vertical survey line system for offshore shallow seismic exploration and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101825723B (en) * | 2004-03-17 | 2012-09-05 | 维斯特恩格科地震控股有限公司 | Offshore earthquake measurement method and system |
| US7660191B2 (en) * | 2005-07-12 | 2010-02-09 | Westerngeco L.L.C. | Methods and apparatus for acquisition of marine seismic data |
| US8064286B2 (en) * | 2006-05-05 | 2011-11-22 | Optoplan As | Seismic streamer array |
| CN101680961A (en) * | 2007-05-17 | 2010-03-24 | 格库技术有限公司 | Methods for efficiently acquiring wide-azimuth towed streamer seismic data |
| CN101930080B (en) * | 2009-06-26 | 2012-08-15 | 中国石油集团东方地球物理勘探有限责任公司 | Secondary positioning method for submarine cable based on surface fitting |
| US9529102B2 (en) * | 2010-04-30 | 2016-12-27 | Conocophillips Company | Caterpillar-style seismic data acquisition using autonomous, continuously recording seismic data recorders |
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