CN104076387B - A kind of shallow sea barrier OBC earthquake-capturing focus construction methods - Google Patents
A kind of shallow sea barrier OBC earthquake-capturing focus construction methods Download PDFInfo
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- CN104076387B CN104076387B CN201410249923.0A CN201410249923A CN104076387B CN 104076387 B CN104076387 B CN 104076387B CN 201410249923 A CN201410249923 A CN 201410249923A CN 104076387 B CN104076387 B CN 104076387B
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Abstract
A kind of shallow sea barrier OBC earthquake-capturing focus construction methods, belong to shallow sea OBC earthquake-capturing, the marine geologic survey technical field that there is barrier.Contain following steps；(1) finely make an on-the-spot survey, determine particular location of the barrier in work area.(2) obstacle article coordinate is plotted on the collection such as gram unrestrained or green mountain design software.(3) avoidance and Encryption Design are carried out according to the barrier on collection design software.(4) after carrying out avoidance and Encryption Design to barrier, shot point missing and data breach situation are analyzed with collection design and treatment software, determine that degree of covering, data breach etc. meet associated specifications.(5) constructed according to avoidance and Encryption Design.
Description
Technical field
The present invention relates to a kind of shallow sea barrier OBC earthquake-capturing focus construction methods, belong to the shallow sea that there is barrier
OBC earthquake-capturings, marine geologic survey technical field.
Background technology
Obstacle in shallow sea complicated earth surface type and region has larger shadow to High-precision O BC seismic data acquisition operations
Ring, shallow sea barrier is mainly including drilling and producing platform, single point mooring, man-made island, bridge etc..The presence of these larger barriers, meeting
Causing component arrangement line cannot be laid, and part shot point cannot be excited, and cause shallow-layer data to lack.Data quality is bad, imaging essence
Degree is also affected.With the raising of shallow sea prospection Exploitation degree, the requirement more and more higher to data quality is more obtained
Seismic data in barrier can further improve imaging precision, it is ensured that exploration effects.Traditional OBC earthquakes construction method is in barrier
Hindering the implementation in area to be mainly takes special observation system to design, for example, encrypt minispread, encryption shot point etc. on barrier border, plus
Close principle is all parallel to survey line arrangement or the arrangement of big gun line, although the degree of covering of mid-deep strata, shallow-layer can be made up
The more difficult control of data breach.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide a kind of shallow sea barrier OBC earthquake-capturing focus construction parties
Method.
A kind of shallow sea barrier OBC earthquake-capturing focus construction methods, rely on the shape of barrier, using curved line method in length and breadth
And the shot point such as oblique line method is laid and exciting method so that big gun line is excited and no longer stick to linear form of construction work, is become more
It is flexible and changeable, so as to improve operating efficiency, more barrier seismic datas are obtained, reduce data shallow-layer breach, to greatest extent
Ground ensures data-integrity.
The current light-duty OBC cable operation methods in shallow sea be mainly arranging line is completed after carried out exciting operation by energy source boat.
Energy source boat carries out shot point and excites the advantage of operation, such operation to be easy for field behaviour along the shot point line direction of parallel alignment
Make, reduce the offline number of times for turning around and time on energy source boat, operating efficiency is increased substantially, while when the depth of water can be avoided shallower
Arrangement is crossed, arranging line is hung up, is hung partially.
But due to the presence of shallow sea barrier, big gun line cut-off is opened, influence energy source boat normal operation.For this using innovative
The method of curved line in length and breadth and the construction of the method such as oblique line method,
A kind of shallow sea barrier OBC earthquake-capturing focus construction methods, contain following steps；
(1) finely make an on-the-spot survey, determine particular location of the barrier in work area.
(2) obstacle article coordinate is plotted on the collection such as gram unrestrained or green mountain design software.
(3) avoidance and Encryption Design are carried out according to the barrier on collection design software.Here it is divided into two kinds of situations：
A. when the rule barrier such as platform, single point mooring is run into, constructed using curved line method in length and breadth, the horizontal big gun line of design and
Curved line big gun line.Generally the big gun line of shallow sea OBC constructions is parallel to arrange survey line, when there is barrier in construction area
When, take curved line avoidance in direction arranged in parallel, the method that big gun line is encrypted in vertical arrangement direction ensureing the premise of safe distance
Under, energy source boat presses close to barrier construction.
B. when the irregular slalom thing such as L-type trestle is run into, the slope of trestle is calculated, what disturbance of analysis thing influenceed excites model
Enclose, press close to trestle cloth and set out the oblique line shot point group similar to trestle slope.When trestle both sides are constructed, take energy source boat it is offline fall
Head does not stop big gun, continues to excite, partially the method for point construction, and data is obtained as far as possible, makes up shallow-layer degree of covering missing.
(4) after carrying out avoidance and Encryption Design to barrier, shot point is lacked and data with collection design and treatment software
Breach situation is analyzed, and determines that degree of covering, data breach etc. meet associated specifications.
(5) constructed according to avoidance and Encryption Design.
It is an advantage of the invention that the present invention improves and optimizes conventional construction method, on the premise of navigation safety is ensured,
Make energy source boat infinite approach barrier, in all directions surround barrier so that cannot swash under normal mode operation originally
The shot point of hair obtains implementation and excites.The influence of barrier can be minimized by application the method, by shallow-layer data breach
Minimum is tapered to, so as to obtain good earthquake-capturing effect.
Brief description of the drawings
When considered in conjunction with the accompanying drawings, by referring to following detailed description, can more completely more fully understand the present invention with
And the adjoint advantage of many of which is easily learnt, but accompanying drawing described herein is used for providing a further understanding of the present invention,
A part of the invention is constituted, schematic description and description of the invention is used to explain the present invention, does not constitute to this hair
Bright improper restriction, such as figure are wherein：
Fig. 1 platforms barrier big gun is cautious to implement figure (not carrying out horizontal construction)；
(note is schemed in the cautious implementation of big gun after Fig. 2 laterally constructs：Single-point is shot point in two figures, and line point is geophone station)；
Fig. 3 platforms barrier coverage plot；
Fig. 4 " L-type " trestle location drawing；
Fig. 5 oblique lines method construction schematic diagram；
Fig. 6 is offline to turn around not stop big gun schematic diagram；
Fig. 7 practice of construction completes shot point figure；
Fig. 8 a：Before using oblique line method (the data breach section near trestle)；
Fig. 8 b：After being constructed using oblique line method (the data breach section near trestle)
The present invention is further described with reference to the accompanying drawings and examples.
Specific embodiment
Obviously, those skilled in the art belong to guarantor of the invention based on many modifications and variations that spirit of the invention is done
Shield scope.
Embodiment 1：As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 a, Fig. 8 b,
There are multiple drilling and producing platforms in the BZ projects work area west and south, these platforms are about 70-150 meters, wide about 60-90 meters, and one
As it is apart from each other between platform, wherein there is two platforms adjacent, between distance be about 300 meters；There is a L-type in the work area northwestward
Trestle.In the project using the focus construction method such as curved line method and oblique line method in length and breadth, preferable collection effect is achieved.It is specific real
Apply process as follows：
(1) finely make an on-the-spot survey, determine position of the barrier on construction map, safe distance or safety zone are reserved in advance.
And barrier is plotted on design map.
(2) two methods have been respectively adopted and have crossed barrier construction：
A. according to the characteristics of platform barrier, shot point is laid using curved line method in length and breadth.It is curved along design when energy source boat crosses platform
Line is travelled, and does not occur empty road during construction, but indivedual shot points lack (as shown in Figure 1).Horizontal big gun line is carried out further according to design
Construction, compensate for 4 big guns (as shown in Figure 2) that longitudinal direction cannot construct.
Carry out bin degree of covering analysis.When crossing platform barrier, original design degree of covering 96 times, using curved line method in length and breadth
Overall degree of covering more than 80 times after construction.By profile analysis, the control of shallow-layer data breach exists when survey line crosses platform barrier
0.3s or so (as shown in Figure 3), has reached expected collection effect.
B. according to the characteristics of L-type trestle, oblique line method focus arrangement and method for construction is implemented.By on L-type trestle spread to design map
(as shown in Figure 4).
The slope of trestle is calculated, the shot point scope of its influence is analyzed, trestle south and north flanks respectively there are 6 artillery salvo points can not be real
Apply, cause data breach for 1s (as shown in Figure 8 a), press close to trestle and design oblique line shot point (such as Fig. 5 similar to trestle slope
It is shown).When trestle both sides are constructed, the offline strategy (as shown in Figure 6) for turning around not stop big gun continuation point construction partially of energy source boat is taken,
The degree of covering in trestle area can so be increased.
(3) in practice of construction, along oblique line 91 big guns of construction (as shown in Figure 7).Analyzed by bin degree of covering, trestle area
The actual degree of covering in domain is more than 92 times, meets technical requirements, has reached Expected Results.Final section breach control is left in 0.5s
Right (as shown in Figure 8 b).
In the work progress in other similar obstacles areas of BZ projects, employ above shot point and lay and focus construction party
Method, efficiently solves shallow-layer data breach and shot point missing problem, achieves good earthquake-capturing effect.
As described above, embodiments of the invention are explained, but as long as essentially without this hair of disengaging
Bright inventive point and effect can have many deformations, and this will be readily apparent to persons skilled in the art.Therefore, this
The variation of sample is also integrally incorporated within protection scope of the present invention.
Claims (1)
1. a kind of shallow sea barrier OBC earthquake-capturing focus construction methods, it is characterised in that contain following steps；
(1) finely make an on-the-spot survey, determine particular location of the barrier in construction area；
(2) obstacle article coordinate is plotted on gram unrestrained or green mountain collection design software；
(3) avoidance and Encryption Design are carried out according to the barrier on collection design software；Here it is divided into two kinds of situations：
A. when regular barrier, and the regular barrier is run into including platform or single point mooring, applied using curved line method in length and breadth
Work, the horizontal big gun line of design and curved line big gun line；Generally the big gun line of shallow sea OBC constructions is parallel to arrange survey line, when applying
When there is barrier in the domain of work area, line direction curved line avoidance arranged in parallel is taken, vertical arrangement line direction encryption big gun line
Method, on the premise of safe distance is ensured, energy source boat presses close to barrier construction；
B. when irregular slalom thing, and the irregular slalom thing is run into including L-type trestle, the slope of trestle, analysis are calculated
The excites scope of barrier influence, presses close to trestle cloth and sets out the oblique line shot point group similar to trestle slope；In the construction of trestle both sides
When, take that energy source boat is offline to turn around not stop big gun, continue to excite, partially the method for point construction, data is obtained as far as possible, make up shallow-layer and cover
Lid number of times is lacked；
(4) after carrying out avoidance and Encryption Design to barrier, shot point is lacked with collection design software and data breach situation is entered
Row analysis, determines that degree of covering, data breach meet associated specifications；
(5) constructed according to avoidance and Encryption Design.
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| CN111273339B (en) * | 2018-12-04 | 2022-12-02 | 中国石油天然气集团有限公司 | Shot point encryption method and system based on barrier target area |
| CN111562609B (en) * | 2020-05-20 | 2023-01-10 | 中石化石油工程技术服务有限公司 | Automatic excitation point obstacle avoidance method and system |
| CN113009573B (en) * | 2021-02-25 | 2023-07-18 | 中国石油集团东方地球物理勘探有限责任公司 | Seismic data acquisition method, device, computer equipment and storage medium |
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| US6629037B1 (en) * | 2000-06-26 | 2003-09-30 | Westerngeco, L.L.C. | Optimal paths for marine data collection |
| CN102662192B (en) * | 2004-03-17 | 2017-06-30 | 维斯特恩格科地震控股有限公司 | Marine seismic survey method and system |
| US8824239B2 (en) * | 2004-03-17 | 2014-09-02 | Westerngeco L.L.C. | Marine seismic survey method and system |
| US8593905B2 (en) * | 2009-03-09 | 2013-11-26 | Ion Geophysical Corporation | Marine seismic surveying in icy or obstructed waters |
| CN102236103A (en) * | 2010-05-07 | 2011-11-09 | 杨世奇 | Automatic obstacle avoidance optimization design technology of three-dimensional seismic exploration acquisition observation system based on geographic information |
| CN103605152B (en) * | 2013-10-30 | 2016-04-06 | 中国石油天然气集团公司 | A kind of automatic shot point offset method based on barrier place of safety |
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