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continuation value
相关语句
  延拓值
     ②time shift quantity of migration for wave field depth continuation in total uniform bed,time shift quantity of migration in each bed and amplitude correction factor can be calculated by splitting velocity field into constant velocity background and variable velocity disturbance and then final wave field continuation value can be obtained.
     2把速度场分裂为层内常速背景和变速扰动 ,可求得整个均匀层波场深度延拓的偏移时移量、各层的偏移时移量及振幅校正系数 ,进而可得到最终波场延拓值
短句来源
     Its basic principles are:P wave displacement equation in frequency time domain is transformed a basic wave continuation equation by split method,then dispersion and absorption boundary condition is carried out and wave continuation value is obtained by using high order finite difference;
     其基本原理为 :用分裂法将频率—空间域的纵波位移方程转换为基本波场延拓方程 ,然后进行频散、吸收边界条件校正 ,采用高阶有限差分法求取波场延拓值 ;
短句来源
     according to perturbation theory, the velocity field is divided into constant velocity background in layer and velocity-changed disturbance to compute time-shifted values of migration and correction coefficients of amplitude for depth continuation of wavefield in whole uniform layer as well as in separate layers, obtaining final continuation value of wavefield and fulfilling the formula transformation from common-shot domain to CMP domain.
     根据摄动理论把速度场分裂为层内常速背景和变速扰动,求得整个均匀层波场深度延拓的偏移时移量及振幅校正系数、各层的偏移时移量及振幅校正系数,得到最终的波场延拓值,实现了共炮域公式到CMP域公式的转换。
短句来源
  场延拓值
     ②time shift quantity of migration for wave field depth continuation in total uniform bed,time shift quantity of migration in each bed and amplitude correction factor can be calculated by splitting velocity field into constant velocity background and variable velocity disturbance and then final wave field continuation value can be obtained.
     2把速度场分裂为层内常速背景和变速扰动 ,可求得整个均匀层波场深度延拓的偏移时移量、各层的偏移时移量及振幅校正系数 ,进而可得到最终波场延拓值
短句来源
     Its basic principles are:P wave displacement equation in frequency time domain is transformed a basic wave continuation equation by split method,then dispersion and absorption boundary condition is carried out and wave continuation value is obtained by using high order finite difference;
     其基本原理为 :用分裂法将频率—空间域的纵波位移方程转换为基本波场延拓方程 ,然后进行频散、吸收边界条件校正 ,采用高阶有限差分法求取波场延拓值 ;
短句来源
     according to perturbation theory, the velocity field is divided into constant velocity background in layer and velocity-changed disturbance to compute time-shifted values of migration and correction coefficients of amplitude for depth continuation of wavefield in whole uniform layer as well as in separate layers, obtaining final continuation value of wavefield and fulfilling the formula transformation from common-shot domain to CMP domain.
     根据摄动理论把速度场分裂为层内常速背景和变速扰动,求得整个均匀层波场深度延拓的偏移时移量及振幅校正系数、各层的偏移时移量及振幅校正系数,得到最终的波场延拓值,实现了共炮域公式到CMP域公式的转换。
短句来源
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  continuation value
We also showed that continuation value depends on the SUM of current volume and volume change, rather than on both of them separately.
      
The second line is the continuation value under no employment adjustment.
      
The right hand side is the loss in expected continuation value from the current deviation.
      
The first term gives their current utility, while the second term is the continuation value, discounted to account both for impatience and growth.
      
They estimate the continuation value of the swaption by regressing future payoffs on a set of basis functions of the state variables.
      
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Several common used wavefield extrapolating method up to now(such as split step Fourier method,Fourier finite difference method,generalized screen method and finite difference method in frequency space domain) can obtain a good imaging result in common shot gathers,but in order to take account of transmitting angle of different waves,quite a number of side traces need to be added when making migration for each shot,and shot points and receiver points need to be extrapolated downward separately,so there...

Several common used wavefield extrapolating method up to now(such as split step Fourier method,Fourier finite difference method,generalized screen method and finite difference method in frequency space domain) can obtain a good imaging result in common shot gathers,but in order to take account of transmitting angle of different waves,quite a number of side traces need to be added when making migration for each shot,and shot points and receiver points need to be extrapolated downward separately,so there are considerable amount of computation.Aimed at above problems,the paper presented a wave equation pre stack depth migration for common offset gathers based on double square roots operator which can be used for 2 D and 3 D wave equation pre stack depth imaging,the steps are:①the phase shift formulae for wave field continuation can be obtained by stationary phase approach forintegration of wave field continuation on common offset gathers in a condition of high frequency hypothesis;②time shift quantity of migration for wave field depth continuation in total uniform bed,time shift quantity of migration in each bed and amplitude correction factor can be calculated by splitting velocity field into constant velocity background and variable velocity disturbance and then final wave field continuation value can be obtained. Pulse response test and theoretic model migration test show that the migration method has a higher computational efficiency and better imaging quality and suitable for imaging of complex geologic body.

程玖兵 ,王华忠 ,于富文 ,马在田 .波动方程共炮检距道集叠前深度偏移 .石油地球物理勘探 ,2 0 0 1,36 (5 ) :5 2 6~ 5 32  目前所用的几种波场外推算法 (分步傅里叶、傅里叶有限差分、广义屏和频率—空间域有限差分 )可以在共炮道集上获得较好的成像效果。在上述算法中 ,共炮道集为了兼顾各种波传播角 ,每炮偏移都要考虑相当多的边道 ,并且炮点和检波点要分别向下外推 ,因而计算量很大。针对上述问题 ,本文提出了基于双平方根算子的波动方程共炮检距道集的深度偏移方法 ,它适用于二维和三维叠前深度成像 ,其步骤为 :1在高频假设条件下 ,把共炮检距道集波场延拓公式中的积分运算进行稳相近似 ,得到波场延拓的相移公式 ;2把速度场分裂为层内常速背景和变速扰动 ,可求得整个均匀层波场深度延拓的偏移时移量、各层的偏移时移量及振幅校正系数 ,进而可得到最终波场延拓值。脉冲响应测试和理论模型试算表明 ,该方法具有较高的计算效率和成像精度 ,可适用于复杂地质体成像

In order to solve the problem of influence of complicated surface velocity change on reflection wave,on the basis of tomographic inversion of first break surface model,the paper studied theory and method for surface model correction by wave field continuation,and formed a suit of effective calculation method.Its basic principles are:P wave displacement equation in frequency time domain is transformed a basic wave continuation equation by split method,then dispersion and absorption boundary condition is carried...

In order to solve the problem of influence of complicated surface velocity change on reflection wave,on the basis of tomographic inversion of first break surface model,the paper studied theory and method for surface model correction by wave field continuation,and formed a suit of effective calculation method.Its basic principles are:P wave displacement equation in frequency time domain is transformed a basic wave continuation equation by split method,then dispersion and absorption boundary condition is carried out and wave continuation value is obtained by using high order finite difference;in a condition of lateral constant velocity for wave continuation,it carried out by using phase shift method to solve single square root equation in a frequency wavenumber domain.The concrete practices are:①continuation of receiver point on the gather to top of high velocity bed;②continuation of shot point to top of high velocity bed;③separate continuation of receiver point and shot point to datum of CMP position by replaced velocity;④carrying out velocity analysis,NMO correction and stack(or carrying out prestack depth migration directly). Theory and real data processing results showed that the method in the paper both can realize hyperbolic correction for variated time difference and make wavefield after correction satisfy wave character in that position.

李录明 ,罗省贤 .波场延拓表层模型校正 .石油地球物理勘探 ,2 0 0 1,36 (5 ) :5 72~ 5 83  为解决复杂表层速度变化对反射波的影响问题 ,在初至波表层模型层析反演的基础上 ,研究了波场延拓表层模型校正的理论方法 ,形成了一套有效的计算方法。其基本原理为 :用分裂法将频率—空间域的纵波位移方程转换为基本波场延拓方程 ,然后进行频散、吸收边界条件校正 ,采用高阶有限差分法求取波场延拓值 ;对于波场延拓横向不变速的情况 ,用相移法求解频率—波数域的单平方根方程进行波场延拓。具体作法为 :1将炮集内的各接收点延拓到高速层顶界 ;2将炮点延拓到高速层顶界 ;3用替换速度分别将接收点和炮点延拓到 CMP位置的基准面 ;4进行速度分析、动校正及叠加 (或直接进行叠前深度偏移 )。理论和实际资料处理结果表明 ,文中方法既可以实现双曲线的变时差校正 ,又可使校正后的波场满足所在位置的波动特征

The paper presented a method of amplitude-preserved prestack depth migration based on double square root equation. Firstly, starting from the amplitude-preserved equation of single square root operator and combining the amplitude-preserved up-going wavefield with down-going wavefield to approximately represent full acoustic wavefield, then, deducing one-way wave equation defined by double squave root operator; according to perturbation theory, the velocity field is divided into constant velocity background in...

The paper presented a method of amplitude-preserved prestack depth migration based on double square root equation. Firstly, starting from the amplitude-preserved equation of single square root operator and combining the amplitude-preserved up-going wavefield with down-going wavefield to approximately represent full acoustic wavefield, then, deducing one-way wave equation defined by double squave root operator; according to perturbation theory, the velocity field is divided into constant velocity background in layer and velocity-changed disturbance to compute time-shifted values of migration and correction coefficients of amplitude for depth continuation of wavefield in whole uniform layer as well as in separate layers, obtaining final continuation value of wavefield and fulfilling the formula transformation from common-shot domain to CMP domain. It is shown by the tests of theoretical model and real data processing, the method not only has higher computational efficiency and imaging precision, but also can show the amplitude information reflecting underground reflection coefficients correctly, benefit to analyze the AVO/AVA seismic attributes, providing accurate seismic data for lithologic identification and reservoir prediction.

本文提出了一种基于双平方根方程的保幅叠前深度偏移方法,首先从保幅的单平方根算子方程出发,将保幅的上、下行波场进行组合近似表示为全声波波场,然后推导出由双平方根算子定义的单程波方程;根据摄动理论把速度场分裂为层内常速背景和变速扰动,求得整个均匀层波场深度延拓的偏移时移量及振幅校正系数、各层的偏移时移量及振幅校正系数,得到最终的波场延拓值,实现了共炮域公式到CMP域公式的转换。理论模型试算和实际资料处理表明,该方法不但具有较高的计算效率和成像精度,而且可以输出正确反映地下反射系数的振幅信息,有利于AVO/AVA地震属性分析,提供精确的岩性识别与储层预测地震数据。

 
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