CN104076387A - Shallow sea obstacle zone OBC seismic focus acquisition construction method - Google Patents

Shallow sea obstacle zone OBC seismic focus acquisition construction method Download PDF

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Publication number
CN104076387A
CN104076387A CN201410249923.0A CN201410249923A CN104076387A CN 104076387 A CN104076387 A CN 104076387A CN 201410249923 A CN201410249923 A CN 201410249923A CN 104076387 A CN104076387 A CN 104076387A
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barrier
construction
design
line
obstacle
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CN201410249923.0A
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CN104076387B (en
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董伟
梁宝军
张洪军
李晓东
邓波
童利清
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BGP Inc
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BGP Inc
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Abstract

The invention discloses a shallow sea obstacle zone OBC seismic focus acquisition construction method, and belongs to the technical field of OBC seismic acquisition and marine geological survey in the shallow sea with an obstacle. The method comprises the steps that (1) fine scouting is carried out, and the specific position of the obstacle in a work zone is determined; (2) the coordinates of the obstacle are drawn on acquisition design software such as Klseis software or green mountain software; (3) obstacle avoidance and encryption design are carried out according to the obstacle on the acquisition design software; (4) after the obstacle avoidance and encryption design are carried out on the obstacle, the acquisition design and processing software is used for analyzing the shot point deletion and data gap phenomena, and it is determined that the degree of covering, the data gap and the like meet the related technical requirement; (5) construction is carried out according to the obstacle avoidance and encryption design.

Description

Barrier, a kind of shallow sea OBC earthquake-capturing focus construction method
Technical field
The present invention relates to barrier, a kind of shallow sea OBC earthquake-capturing focus construction method, belong to the shallow sea OBC earthquake-capturing, the marine geologic survey technical field that there are barrier.
Background technology
On High-precision O BC seismic data acquisition, operation has larger impact to obstacle in shallow sea complicated earth surface type and region, and barrier, shallow sea mainly comprises drilling and producing platform, swinging mooring, man-made island, bridge etc.The existence of these larger barriers, can cause the part arranging line cannot lay, and part shot point cannot excite, and causes shallow-layer data disappearance.Data quality is bad, and imaging precision has also been subject to impact.Along with the raising of shallow sea prospection exploitation degree, more and more higher to the requirement of data quality, the seismic data in acquired disturbance district can further improve imaging precision more, ensures exploration effects.Traditional OBC earthquake construction method is mainly to take special observation system in the enforcement of barrier, for example encrypt minispread on border, barrier, encrypt shot point etc., the principle of encrypting is to be all parallel to survey line arrangement or the arrangement of big gun line, although can make up the degree of covering of mid-deep strata, the more difficult control of shallow-layer data breach.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides barrier, a kind of shallow sea OBC earthquake-capturing focus construction method.
Barrier, a kind of shallow sea OBC earthquake-capturing focus construction method, rely on the shape of barrier, adopt the shot point such as curved line method and oblique line method in length and breadth to lay and exciting method, big gun line is excited and no longer stick to linear form of construction work, become more flexible and changeable, thereby improve operating efficiency, obtain more barrier seismic data, reduce data shallow-layer breach, ensure to greatest extent data-integrity.
The light-duty OBC cable operation method in shallow sea is mainly to excite operation by energy source boat after arranging line is completed at present.Energy source boat carries out shot point along the shot point line direction of parallel alignment and excites operation, the advantage of operation is to be convenient to field operation like this, reduce number of times and the time of on energy source boat, rolling off the production line and turning around, increase substantially operating efficiency, can avoid the depth of water more shallow time, cross arrangement, arranging line is hung up, hung partially simultaneously.
But due to the existence of barrier, shallow sea, big gun line is cut off and opened, affect energy source boat normal operation.Adopt the innovative method such as the method for curved line in length and breadth and oblique line method construction for this reason,
Barrier, a kind of shallow sea OBC earthquake-capturing focus construction method, contains following steps;
(1) meticulous making an on-the-spot survey, determines the particular location of barrier in work area.
(2) barrier coordinate being plotted to gram wave or green mountain etc. gathers on design software.
(3) keep away barrier and Encryption Design according to the barrier gathering on design software.Here be divided into two kinds of situations:
A. in the time running into the regular barrier such as platform, swinging mooring, adopt curved line method construction in length and breadth, design horizontal big gun line and curved line big gun line.Generally the big gun line of shallow sea OBC construction is parallel to arrangement survey line, in the time there is barrier in construction area, the direction curved line of taking to be arranged in parallel is kept away barrier, and homeotropic alignment direction is encrypted the method for big gun line, ensure safe distance under prerequisite, energy source boat is pressed close to barrier construction.
B. in the time running into the irregular slalom things such as L-type trestle, calculate the slope of trestle, what disturbance of analysis thing affected excites scope, presses close to trestle cloth and sets out the oblique line shot point group similar to trestle slope.While construction in trestle both sides, take energy source boat to roll off the production line and turn around not stop big gun, continue to excite, the method for some construction, obtains data as far as possible partially, makes up shallow-layer degree of covering disappearance.
(4) barrier is kept away after barrier and Encryption Design, with gathering design and process software, shot point disappearance and data breach situation are analyzed, determine that degree of covering, data breach etc. meet correlation technique requirement.
(5) according to keeping away barrier and Encryption Design construction.
Advantage of the present invention is that the present invention improves and optimized conventional construction method, ensureing under the prerequisite of navigation safety, make energy source boat infinite approach barrier, along all directions, barrier is surrounded, make the shot point that originally cannot excite under normal mode operation obtain implementing to excite.The impact of barrier can be down to minimumly by application the method, shallow-layer data breach be tapered to minimum, thereby obtain good earthquake-capturing effect.
Brief description of the drawings
When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the present invention and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
The cautious figure (laterally constructing) that implements of Fig. 1 platform barrier big gun;
Fig. 2 is the cautious figure (note: in two figure, single-point is shot point, and line point is geophone station) that implements of the rear big gun of construction laterally;
Fig. 3 platform barrier coverage plot;
Fig. 4 " L-type " trestle location drawing;
Fig. 5 oblique line method construction schematic diagram;
Fig. 6 rolls off the production line and turns around not stop big gun schematic diagram;
Fig. 7 practice of construction completes shot point figure;
Fig. 8 a: adopt (near data breach section trestle) before oblique line method;
Fig. 8 b: adopt (near data breach section trestle) after the construction of oblique line method
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Obviously the many modifications and variations that, those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
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 west and south, BZ project work area, these platforms are about 70-150 rice, wide about 60-90 rice, apart from each other between general platform, wherein has two platforms adjacent, between distance be about 300 meters; There is a L-type trestle in the northwestward, work area.Adopt the focus construction method such as curved line method and oblique line method in length and breadth in this project, obtained good collection effect.Specific implementation process is as follows:
(1) meticulous making an on-the-spot survey, determines the position of barrier on construction map, reserves in advance safe distance or safety zone.And barrier is plotted on design map.
(2) adopted respectively two kinds of methods to cross barrier construction:
A. according to the feature of platform barrier, adopt curved line method in length and breadth to lay shot point.When energy source boat is crossed platform, travel along design curved line, when construction, do not occur empty road, but indivedual shot point disappearances (as shown in Figure 1).Carry out horizontal big gun line construction according to design again, made up 4 big guns (as shown in Figure 2) that longitudinally cannot construct.
Carry out the analysis of bin degree of covering.While crossing platform barrier, former design degree of covering 96 times, adopts curved line method in length and breadth to construct rear overall degree of covering more than 80 times.By profile analysis, when survey line is crossed platform barrier, shallow-layer data breach is controlled at 0.3s left and right (as shown in Figure 3), has reached the collection effect of expection.
B. according to the feature of L-type trestle, implement oblique line method focus arrangement and method for construction.By L-type trestle spread to design map on (as shown in Figure 4).
Calculate the slope of trestle, analyze the shot point scope of its impact, trestle south and north flanks respectively has 6 artillery salvo points not implement, and the data breach of causing is 1s (as shown in Figure 8 a), presses close to trestle and designs the oblique line shot point (as shown in Figure 5) similar to trestle slope.While construction in trestle both sides, take energy source boat to roll off the production line and turn around not stop the big gun continuation strategy (as shown in Figure 6) of some construction partially, can increase like this degree of covering in trestle district.
(3) in the time of practice of construction, along oblique line 91 big guns (as shown in Figure 7) of constructing.Analyze by bin degree of covering, the actual degree of covering in trestle region is more than 92 times, meets technical requirement, has reached Expected Results.Final section breach is controlled at 0.5s left and right (as shown in Figure 8 b).
In the work progress in other similar obstacles district of BZ project, all adopt above shot point to lay and focus construction method, efficiently solve shallow-layer data breach and shot point and lack problem, obtain good earthquake-capturing effect.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.

Claims (1)

1. barrier, a shallow sea OBC earthquake-capturing focus construction method, is characterized in that containing following steps;
(1) meticulous making an on-the-spot survey, determines the particular location of barrier in work area;
(2) barrier coordinate being plotted to gram wave or green mountain etc. gathers on design software;
(3) keep away barrier and Encryption Design according to the barrier gathering on design software; Here be divided into two kinds of situations:
A. in the time running into the regular barrier such as platform, swinging mooring, adopt curved line method construction in length and breadth, design horizontal big gun line and curved line big gun line; Generally the big gun line of shallow sea OBC construction is parallel to arrangement survey line, in the time there is barrier in construction area, the direction curved line of taking to be arranged in parallel is kept away barrier, and homeotropic alignment direction is encrypted the method for big gun line, ensure safe distance under prerequisite, energy source boat is pressed close to barrier construction;
B. in the time running into the irregular slalom things such as L-type trestle, calculate the slope of trestle, what disturbance of analysis thing affected excites scope, presses close to trestle cloth to set out the oblique line shot point group similar to trestle slope; While construction in trestle both sides, take energy source boat to roll off the production line and turn around not stop big gun, continue to excite, the method for some construction, obtains data as far as possible partially, makes up shallow-layer degree of covering disappearance;
(4) barrier is kept away after barrier and Encryption Design, with gathering design and process software, shot point disappearance and data breach situation are analyzed, determine that degree of covering, data breach etc. meet correlation technique requirement;
(5) according to keeping away barrier and Encryption Design construction.
CN201410249923.0A 2014-06-06 2014-06-06 A kind of shallow sea barrier OBC earthquake-capturing focus construction methods Active CN104076387B (en)

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CN111273339A (en) * 2018-12-04 2020-06-12 中国石油天然气集团有限公司 Shot point encryption method and system based on barrier target area
CN111562609A (en) * 2020-05-20 2020-08-21 中石化石油工程技术服务有限公司 Automatic excitation point obstacle avoidance method and system
CN113009573A (en) * 2021-02-25 2021-06-22 中国石油集团东方地球物理勘探有限责任公司 Seismic data acquisition method, seismic data acquisition device, computer equipment and storage medium

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CN111562609A (en) * 2020-05-20 2020-08-21 中石化石油工程技术服务有限公司 Automatic excitation point obstacle avoidance method and system
CN113009573A (en) * 2021-02-25 2021-06-22 中国石油集团东方地球物理勘探有限责任公司 Seismic data acquisition method, seismic data acquisition device, computer equipment and storage medium

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