extrapolation operator中文是什么意思

發(fā)音:

中文翻譯
造句

外推算子

operator n. 1.操作者，機務(wù)員；司機，駕駛員；【軍事】電話兵； ...
local extrapolation operator 局部外推算子
extrapolation 推演; 外推，外推法; 外推法；外插法; 外推法歸納; 外延法
extrapolation extrapolation 外插
after extrapolation 在外插值之后
analytic extrapolation 解析外推
analytical extrapolation 解析外推法
bandwidth extrapolation 帶寬外推
before extrapolation 在外插值之前
distant extrapolation 距離外推法
exponential extrapolation 指數(shù)外推法
extrapolation and forecast 外推法與預(yù)測
extrapolation chamber 推導(dǎo)電離室; 外推(法)電離室; 外推電離室; 外推電離箱
extrapolation change 外插值改變
extrapolation coefficient 外推系數(shù)
extrapolation criticality 外推臨界
extrapolation design 外推法設(shè)計
extrapolation distance 外推距離
extrapolation error 外推誤差; 外延誤差
extrapolation filter 外推濾波器
extrapolation formula 外插公式; 外推公式
extrapolation function 外推長度; 外推函數(shù)
extrapolation length 外推長度
extrapolation method 外插法, 外推法; 外推法
extrapolation number 外推數(shù); 外推值

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The dissertation focuses on seismic wavefield forward modeling and migration for the fractured reservoir . the paper integrates and researches the wavefield extrapolation operator for lateral variation of velocity , analysis of the wavefield characteristic , forward modeling and depth migration of prestack and poststack seismic wavefield , creation of wavelet , design of the model with fracture and cavity , and computation of reflectivity
本文圍繞縫洞儲層地震波場正演與偏移問題，對橫向變速波場延拓算子；疊前與疊后正演模擬；疊前與疊后深度偏移；子波的生成；縫洞模型的設(shè)計、反射系數(shù)的求取、正演、偏移及其波場特征分析進行了一體化研究。
In term of analyzing and summarizing the existing achievement , propose an advanced and practical wavefield extrapolation operator and arithmetic of forward modeling and migration , which obtain numerical simulation and analysis completely and systemically and exploited new field of fractured reservoir seismic wavefield numerical simulation and applicationin in frequency - wavenumber domain
在總結(jié)、分析前人研究成果的基礎(chǔ)上，提出了具有前瞻性和實用性的波場延拓算子與正演、偏移算法，較系統(tǒng)全面地進行了數(shù)值計算與分析，開辟了頻率?波數(shù)域縫洞儲層地震波場數(shù)值模擬與應(yīng)用的新領(lǐng)域。
A hybrid migration method , named " fourier finite - difference migration " , is a post - stack depth migration scheme . the downward extrapolation operator is split into three operators : one operator is a phase - shift operator for a chosen constant background velocity , another operator is the well - known first - order correction term , and the third operator is a finite - difference operator for the varying of the velocity function . phase - shift downward extrapolation and finite - difference downward extrapolation preserves the advantage of phase - shift method and finite - difference method
傅立葉有限差分(簡稱ffd )偏移算法是一種疊后深度偏移算法，其向下延拓算子是一種混合算子，包括三項：一項是處理常速的相移算子，一項是一階相移修正算子，最后一項是類似45度方程的有限差分算子，用來處理劇烈橫向變速。
Comprehensively discuss the issues in application , adaptive condition and performance , propose a fast arithmetic of forward modeling and depth migration in common shot gathers with one - way acoustic wave equation based on vrselrf , and verify the arithmetic by numerical simulation . concisely discuss the cause of the creation of evanescence and the problem of lateral amplitude discontinuity result from it . fourthly , use the reflectivity model , computed to describe the fracture model , with the formula of computation reflectivity based on elastic - acoustic approximation , and the wavelet model computed by the method , wavelet creation with fourier transform , we proposed , in conjunction with vrselrf wavefield extrapolation operator
第三，將頻率波數(shù)域穩(wěn)定的變參考慢度rytov近似廣義屏波場延拓算子( vrselrf )應(yīng)用于疊前與疊后正演模擬、疊前與疊后深度偏移，對算法應(yīng)用中應(yīng)注意的問題、適用范圍、性能等作了較為全面的論述；提出了基于vrselrf的單程聲波方程共炮記錄正演模擬和深度偏移快速算法，并通過數(shù)值模擬試驗對算法進行了驗證；簡要地討論了倏逝波的產(chǎn)生原因及其帶來的橫向振幅不連續(xù)性問題。
The paper concentrates on seismic wave - field forward modeling and migration for the fractured reservoir . it researches the wavefield extrapolation operator for lateral variation of velocity , design four theoretical models and seven practical models with fracture and cavity . base on the progenitor , in the frequency - wavenumber domain with the pspi wavefield extrapolation operator and arithmetic of forward modeling and migration that applied lateral variation of velocity which is strong , the paper obtains the result of numerical simulation and the wavefield characteristic by the way of the forward modeling and depth migration of poststack seismic wavefield
本文圍繞縫洞儲層地震波場正演與偏移問題，研究了適用于橫向變速波場延拓算子，建立了四個理論的縫洞模型和七個實際的縫洞模型，在總結(jié)、分析前人的研究成果的基礎(chǔ)上，利用適合橫向速度劇烈變化的相移加插值的波場延拓算子，在頻率?波數(shù)域?qū)ι鲜龅牡刭|(zhì)模型進行正演、偏移處理，最后得到了縫洞儲層地震波場的一些特征。
Author , starts from the one - way wave equation of wavefield extrapolation , research the relationship and transform condition of wavefield extrapolation operators , and propose the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) which can adapt severe lateral velocity variations , in frequency - wavenumber domain , and the improved wavefield extrapolation scheme , also give the method to improve the computation efficiency . the achievement establishes the theoretic basis of the whole research
首先，從波場延拓的單程波方程出發(fā)，系統(tǒng)地研究了頻率波數(shù)域的波場延拓算子之間的相互關(guān)系和轉(zhuǎn)換條件并在此基礎(chǔ)上提出了能適應(yīng)劇烈橫向變速的頻率波數(shù)域穩(wěn)定的變參考慢度rytov近似廣義屏波場延拓算子( vrselrf )和部分波場延拓改進方案及提高運算效率的措施，為整個研究打下理論基礎(chǔ)。
Firstly , the paper starts from the one - way wave equation of wavefield extrapolation , research the relationship and transform condition of wavefield extrapolation operators , and improves on the wavefield extrapolation operator and so heightens the operation efficiency , and chooses the pspi that fits to the lateral variation of velocity to resolve the wave - equation , which lay a foundation of the theoretic study
首先，從波場延拓的單程波方程出發(fā)，研究了頻率?波數(shù)域的波場延拓算子之間的相互關(guān)系和轉(zhuǎn)換條件，并在此基礎(chǔ)上改進了波場延拓方案和提高了運算效率，選擇了適合于縱橫向速度劇烈變化的pspi方法求解波動方程，為整個研究打下了理論基礎(chǔ)。
Author , secondly , starts from the approximate expandness of square root operator , perform mathematical calculations for finite difference operator in frequency - space domain , fourier finite difference operator in mixing domain ( frequency - space and frequency - wavenumber domain ) and general screen operator in mixing domain , compare and discuss their precision of their wavefield , adaptability for lateral velocity variations , computation efficiency and stability . thirdly , author , applies the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) in frequency - wavenumber domain , to the prestack and poststack forward modeling and depth migration
第二，從平方根算子的近似展開出發(fā)對頻率?空間域的有限差分算子、混合域(頻率?空間域；頻率?波數(shù)域)的fourier有限差分算子、混合域的廣義屏算子進行了推導(dǎo)并對其波場描述精度、對橫向變速的適應(yīng)性、計算效率和穩(wěn)定性進行了比較與評述。

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