CN109143405B - A kind of observation system efficiently sampling uniformity quantitative evaluation method - Google Patents
A kind of observation system efficiently sampling uniformity quantitative evaluation method Download PDFInfo
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- CN109143405B CN109143405B CN201810865752.2A CN201810865752A CN109143405B CN 109143405 B CN109143405 B CN 109143405B CN 201810865752 A CN201810865752 A CN 201810865752A CN 109143405 B CN109143405 B CN 109143405B
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
Abstract
The present invention discloses a kind of observation system efficiently sampling uniformity quantitative evaluation method, designs observation system template first, in accordance with production requirement, obtains receiving line-spacing RLS, geophone interval Δ x, perpendicular offset of shot line SLS and shooting distance Δ y further according to the parameter of observation system template；Geophone station uniformity parameters Ux, shot point uniformity parameters Uy are calculated separately according to above-mentioned parameter；Seismic wave wavelength X, the first Fresnel-zone range R are calculated out again；Geophone station number N in the first Fresnel-zone range R is fallen in when counting shot point excitation according to the first Fresnel-zone range Rs, and it is calculate by the following formula effective geophone station ratio η；According to geophone station uniformity parameters Ux, shot point uniformity parameters Uy and effective total uniformity U of geophone station ratio η calculating observation system；Observation system is evaluated by observation system total uniformity U.For advantages of the present invention from observation system parameter, mathematics computing model is simple and effective, rapidly and efficiently can carry out quantitative assessment to observation system uniformity.
Description
Technical field
The invention belongs to oil seismic exploration stereo observing system assessment technique field, especially a kind of observation system is effective
Sampling uniformity quantitative evaluation method.
Background technique
In recent years, the object of deepening continuously with seismic prospecting, exploration also becomes increasingly complex, this certainly will need high quality
Observation system.However observation system uniformity is an important factor for evaluating observation system uniformity, the sampling of observation system is equal
Even property has important influence to seismic data quality obtained.Observation system Evaluation for Uniformity largely depends at present
In the experience and habit of designer, a unified standard is lacked to observation system uniformity quantitative assessment.Obvious low quality
Observation system on subsequent seismic processing and can explain that link generates coherent influence.
In view of this problem, for the present invention from observation system parameter, excavating influences the important of observation system uniform sampling
Parameter forms observation system geophone station uniformity, shot point uniformity and total uniformity quantitative assessment technology, thus complete paired observation
System acquisition uniformity integrated evaluating method, while effective geophone station ratio is introduced into observation system Sampling uniformity evaluation system
In system, observation system is formd to different depth target zone Sampling uniformity quantitative assessment, has segmented different depth target zone pair
The requirement of observation system.To keep the preferred means of stereo observing system more perfect, the noise of seismic data is improved with this
Than, resolution ratio, earthquake-capturing task is preferably completed.
Summary of the invention
The present invention mainly overcomes shortcoming in the prior art, proposes that a kind of observation system efficiently sampling uniformity is fixed
Evaluation method is measured, quantitative evaluation can be carried out to observation systems all types of in earthquake-capturing, to adopt to observation system
Sample is uniformly analyzed, while effective geophone station ratio being introduced into observation system Sampling uniformity evaluation system, is formd
Observation system has been segmented different depth target zone and has been wanted to observation system to different depth target zone Sampling uniformity quantitative assessment
It asks.Time update observation system parameter according to production needs obtains the earthquake-capturing observation system of high quality, improves complicated structure
Area's seismic acquisition quality.
The present invention solves technical solution provided by above-mentioned technical problem: a kind of observation system efficiently sampling uniformity is fixed
Measure evaluation method, comprising the following steps:
Step S10, observation system template is designed first, in accordance with production requirement, is obtained further according to the parameter of observation system template
Receive line-spacing RLS, geophone interval Δ x, perpendicular offset of shot line SLS and shooting distance Δ y；
Step S20, geophone station uniformity parameters Ux, shot point uniformity parameters Uy are calculated separately according to above-mentioned parameter；
Step S30, dominant frequency f, speed v, the purpose layer depth h for obtaining seismic wave, are calculated out earthquake further according to following formula
Wave wavelength X, the first Fresnel-zone range R；
λ=v/f
In formula: f is dominant frequency, v is speed, h is purpose layer depth, λ is seismic wave wavelength, R is the first Fresnel-zone range；
Step S40, the first Fresnel-zone range R is fallen in when counting shot point excitation according to the first Fresnel-zone range R
Interior geophone station number Ns, and it is calculate by the following formula effective geophone station ratio η；
η=Ns/Na
In formula: NaTotal geophone station number when being excited for a certain shot point；
Step S50, according to geophone station uniformity parameters Ux, shot point uniformity parameters Uy and effective geophone station ratio η and under
The total uniformity U of formula calculating observation system；
U=Ux × Uy × η
Step S60, observation system is evaluated by observation system total uniformity U, when the total uniformity U value of observation system
About close to 1, observation system sampling is more uniform, and observation system quality is better.
Further technical solution is the specific calculating process of the step S20 are as follows:
A, according to line-spacing RLS and geophone interval Δ x is received, geophone station uniformity parameters Ux is calculated, formula is as follows:
Ux=Δ x/RLS
In formula: RLS is reception line-spacing, Δ x is geophone interval；
B, according to perpendicular offset of shot line SLS and shooting distance Δ y, shot point uniformity parameters Uy is calculated, formula is as follows:
Uy=Δ y/SLS
In formula: SLS is perpendicular offset of shot line, Δ y is shooting distance.
For advantages of the present invention from observation system parameter, mathematics computing model is simple and effective, can rapidly and efficiently
Quantitative assessment is carried out to observation system uniformity；Previous observation system uniformity qualitative evaluation thinking is changed, while will be effective
Geophone station ratio is introduced into observation system Sampling uniformity evaluation system, is more conducive to acquiring shallow target zone observation system
Quality evaluation forms observation system to different depth target zone Sampling uniformity quantitative assessment, has segmented different depth purpose
Requirement of the layer to observation system, can be improved the quality of earthquake-capturing.
Detailed description of the invention
Fig. 1 is observation system template figure；
Fig. 2 is Fresnel-zone schematic diagram；
Fig. 3 is effective detection point range schematic diagram.
Specific embodiment
Further description is done to the present invention below with reference to embodiment and attached drawing.
A kind of observation system efficiently sampling uniformity quantitative evaluation method of the invention, comprising the following steps:
Step S10, observation system template is designed first, in accordance with production requirement, is obtained further according to the parameter of observation system template
Receive line-spacing RLS, geophone interval Δ x, perpendicular offset of shot line SLS and shooting distance Δ y；
Step S20, geophone station uniformity parameters Ux, shot point uniformity parameters Uy are calculated separately according to above-mentioned parameter；
Step S201, according to line-spacing RLS and geophone interval Δ x is received, geophone station uniformity parameters Ux is calculated, formula is such as
Under:
Ux=Δ x/RLS
In formula: RLS is reception line-spacing, Δ x is geophone interval；
Step S202, according to perpendicular offset of shot line SLS and shooting distance Δ y, shot point uniformity parameters Uy is calculated, formula is as follows:
Uy=Δ y/SLS
In formula: SLS is perpendicular offset of shot line, Δ y is shooting distance；
Step S30, dominant frequency f, speed v, the purpose layer depth h for obtaining seismic wave, are calculated out earthquake further according to following formula
Wave wavelength X, the first Fresnel-zone range R；
λ=v/f
In formula: f is dominant frequency, v is speed, h is purpose layer depth, λ is seismic wave wavelength, R is the first Fresnel-zone range；
Step S40, the first Fresnel-zone range R is fallen in when counting shot point excitation according to the first Fresnel-zone range R
Interior geophone station number Ns(i.e. effective geophone station number), and it is calculate by the following formula effective geophone station ratio η；
η=Ns/Na
In formula: NaTotal geophone station number when being excited for a certain shot point；
Step S50, according to geophone station uniformity parameters Ux, shot point uniformity parameters Uy and effective geophone station ratio η and under
The total uniformity U of formula calculating observation system；
U=Ux × Uy × η
Step S60, observation system is evaluated by observation system total uniformity U, it is ideally most uniform to see
Examining system U value is 1, this also illustrates the total uniformity U value of observation system closer to 1, illustrates that observation system sampling is more uniform, observation
Mass of system is better.According to evaluation result and needs of production, observation system parameter is adjusted, selects most suitable observation system
System, to improve the quality of earthquake-capturing.
The present invention excavates the important parameter for influencing observation system uniform sampling from observation system parameter, forms observation
System geophone station uniformity, shot point uniformity and total uniformity quantitative assessment technology, to complete to acquire observation system uniform
Property integrated evaluating method.Effective geophone station ratio is introduced into observation system Sampling uniformity evaluation system simultaneously, is formd
Observation system has been segmented different depth target zone and has been wanted to observation system to different depth target zone Sampling uniformity quantitative assessment
It asks.The advantage is that, from observation system parameter, mathematics computing model is simple and effective, can rapidly and efficiently to observation
System homogeneity carries out quantitative assessment.
The above is not intended to limit the present invention in any form, although the present invention takes off through the foregoing embodiment
Show, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, made when the technology contents using the disclosure above and change or be modified to the equivalent embodiments of equivalent variations a bit, but it is all not
Be detached from technical solution of the present invention content, according to the technical essence of the invention it is to the above embodiments it is any it is simple modification,
Equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (1)
1. a kind of observation system efficiently sampling uniformity quantitative evaluation method, which comprises the following steps:
Step S10, observation system template is designed first, in accordance with production requirement, is received further according to the parameter of observation system template
Line-spacing RLS, geophone interval Δ x, perpendicular offset of shot line SLS and shooting distance Δ y；
Step S20, geophone station uniformity parameters Ux, shot point uniformity parameters Uy are calculated separately according to above-mentioned parameter；
Ux=Δ x/RLS
Uy=Δ y/SLS
Step S30, dominant frequency f, speed v, the purpose layer depth h for obtaining seismic wave, are calculated out seismic wave wave further according to following formula
Long λ, the first Fresnel-zone range R；
λ=v/f
In formula: f is dominant frequency, v is speed, h is purpose layer depth, λ is seismic wave wavelength, R is the first Fresnel-zone range；
Step S40, according to the first Fresnel-zone range R, when counting shot point excitation, inspection in the first Fresnel-zone range R is fallen in
Wave point number Ns, and it is calculate by the following formula effective geophone station ratio η；
η=Ns/Na
In formula: NaTotal geophone station number when being excited for a certain shot point；
Step S50, according to geophone station uniformity parameters Ux, shot point uniformity parameters Uy and effective geophone station ratio η and following formula meter
Calculate the total uniformity U of observation system；
U=Ux × Uy × η
Step S60, observation system is evaluated by observation system total uniformity U, when the total uniformity U value of observation system is close
1, observation system sampling is more uniform, and observation system quality is better.
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| CN112180428B (en) * | 2019-07-03 | 2023-12-26 | 中国石油天然气集团有限公司 | Push-pull observation system receiving relation generation method and device |
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