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聚焦算子
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  focusing operator
     To guarantee the accuracy of double focusing, the focusing operator computing and CFP gather generating methods need to be selected properly.
     (4)要保证双聚焦的精度,必须合理选用计算聚焦算子和生成CFP道集的方法;
短句来源
     CFP imaging techniques will separate pre-stack migration from velocity analysis recurring to two consecutive and independent focusing steps, and substitute operator updating for the direct updating of velocity filed in a traditional way, in the end calculate subsurface velocity filed using correctly updated focusing operator.
     CFP成像技术借助于两个连续且相互独立的聚焦步骤 ,将叠前偏移与速度分析独立开来 ,并且用算子更新代替传统上对速度场的直接更新 ,最后从经过正确更新的聚焦算子反演出地下速度场。
短句来源
     In this article,the author made a description of the double focusing imaging method,discussed the updating method of focusing operator,the results of theoretical model test and listed the other applications of the CFP technology.
     论述了两次聚焦成像的原理 ,讨论了聚焦算子的修改方法 ,并给出了一个理论模型试算结果及CFP的其他应用。
短句来源
     The former adjusts DTS response to align gather's event and to position zero timing line by changing velocity model. Each change of velocity model is followed by calculating focusing operator,CFP gather and DTS response and then using DTS response to calculate corrections of velocity model.
     同步反演是指同时反演聚焦算子和速度模型 ,通过调整速度模型来调整 DTS响应 ,使道集拉平并且位于零线 ,每一次调整速度模型之后都要计算聚焦算子、CFP道集和 DTS响应 ,并根据 DTS响应计算速度模型的修正量。
短句来源
     The main efforts are in picking up DTS response. The asynchronous inversion of operator and velocity model is iterative calculation of correct focusing operator first according to the principle of error symmetry,then inversion of velocity model is proceeded on the basis of operator separately,that bears no relation to picking up DTS response. The method got velocity model indirectly but greatly reduced the work effort of picking up.
     算子和速度模型的异步反演则是先根据误差对称准则迭代计算正确的聚焦算子 ,然后根据算子反演速度模型 ,两个步骤截然分开 ,速度模型的反演不再涉及 DTS响应的拾取 ,该方法间接求取速度模型 ,大大减少了拾取的工作量。
短句来源
更多       
  focus operator
     the influence of the increase of model velocity and the decrease of model time on DTS template and renewing focus operator has similar rule and feature;
     模型速度的增加与模型时间的减小对DTS模板和聚焦算子更新的影响具有类似规律和特征;
短句来源
     The basis of CFP imaging technique is moveout,and the keys are pickup of time-shift and renew of focus operator.
     CFP成像技术的基础是时差,其关键是时移的拾取和聚焦算子的更新。
短句来源
     That is,to correct macro velocity model,differential time shift(DTS)is zero between the focus-point response and its time-inverse focus operator.
     在速度模型正确的情况下,聚焦点响应和它的逆时聚焦算子的聚焦度差异时差(DTS)等于零.
短句来源
     The renewing of focus operator mainly depends on the first renewing.
     聚焦算子的更新主要体现在第一次更新上。
短句来源
     By the aid of two consecutive and independent each other focus steps,the CFP technology separates the pre stack migration from the velocity analysis progress using renewing of operator to replace traditionally direct renewing of velocity field and inversion of subsurface velocity field can be finally finished by correctly renewed focus operator.
     借助于两个连续且相互独立的聚焦步骤 ,CFP成像技术将叠前偏移与速度分析分离开来 ,用算子更新代替传统的对速度场直接更新 ,最后由经正确更新的聚焦算子反演出地下速度场。
短句来源
更多       
  focusing operators
     In consideration of efficiency, accuracy and stability of computation, a finite-difference method fitting to any rectangular grids for computing the focusing operators was presented.
     考虑到计算效率、精度和稳定性 ,提出了利用适于任意矩形网格的有限差分法计算聚焦算子的方法。
短句来源
  “聚焦算子”译为未确定词的双语例句
     Based on the fundament of inversion tomography, the method calculates imaging velocity update by operator update, which got from time difference between CFP response and inverse operator.
     讨论了基于双聚焦成像理论的层析速度反演方法的基本原理,利用该反演方法实现成像速度模型的迭代更新,使最终模型速度更接近于实际地层速度。 由双聚焦成像产生的共聚焦点(CFP)道集是一个部分偏移过的道集,借助于反射层析思想,利用逆时聚焦算子和共聚焦点响应两者之间的时移,通过算子的更新来反演地层速度的更新量。
短句来源
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  focusing operator
This paper presents the analytical procedure to reconstruct 3D volume image from the scattered field using numerical bi-focusing operator.
      
The effectiveness of the use of bi-focusing operator and multi-frequency technique was demonstrated through numerical simulation.
      
The focusing operator can be obtained by taking an inverse of the field induced by a current point source.
      
  focus operator
Three Hungarian constructions are analyzed in which the presence of a 2nd focus operator is proved by independent syntactic evidence.
      
Depth map computed using a 3 x 3 Laplacian focus operator; c.
      
Lastly, high spatial resolution is achieved by minimizing the size of the focus operator.
      
This tuned focus operator was found to have substantially sharper peaks than the discrete Laplacian.
      
The focus measure is simply the output of the focus operator.
      
更多          
  focusing operators
Inversion of the oscillatory property of focusing operators
      
In this paper we show that only the focusing operators have this property.
      


CFP(Common Focus Point)imaging technology contains confocal and bifocal version.The former is used to seek structural information while the later is used to seek reservoir related information.By the aid of two consecutive and independent each other focus steps,the CFP technology separates the pre stack migration from the velocity analysis progress using renewing of operator to replace traditionally direct renewing of velocity field and inversion of subsurface velocity field can be finally finished by correctly...

CFP(Common Focus Point)imaging technology contains confocal and bifocal version.The former is used to seek structural information while the later is used to seek reservoir related information.By the aid of two consecutive and independent each other focus steps,the CFP technology separates the pre stack migration from the velocity analysis progress using renewing of operator to replace traditionally direct renewing of velocity field and inversion of subsurface velocity field can be finally finished by correctly renewed focus operator.The technology maximally avoids the velocity problem while precision imaging can be got.This advantage can be widely used in every aspect of seismic inversion and data processing (such as handling complicated near surface problem, removing multiple,multi component imaging subsalt imaging and time lapse seismic monitoring,etc).Therefore, the CFP imaging technology is a new imaging technology which has advanced theory and wide applied prospect,having a special effect on solving complex geologic problems and gaining wide development space in our country.

CFP成像有共聚焦和双聚焦两种形式。前者用于寻找构造信息 ,后者则主要用于分析与储层描述有关的信息。借助于两个连续且相互独立的聚焦步骤 ,CFP成像技术将叠前偏移与速度分析分离开来 ,用算子更新代替传统的对速度场直接更新 ,最后由经正确更新的聚焦算子反演出地下速度场。该技术在精确成像的同时 ,很好地避免了速度难题。这一优良特性可被广泛应用于地震数据反演和处理的各个方面 (处理复杂近地表难题、多次波消除、多分量偏移、地下盐丘成像及时延地震监测等 )。因此 ,CFP成像技术是一种理论上先进、应用前景广阔的新的成像技术 ,对复杂地质问题的解决更是有着独到的功效 ,在我国可望有广阔的发展空间

With operator-driven replacing model-driven,operator-update replacing velocity-update,the common focusing point(CFP)imaging method could avoid problems of strict requirements for velocity model and difficulties in velocity model updating in prestack depth migration process.CFP approach is suitable for imaging in complex near surface geology.In this article,the author made a description of the double focusing imaging method,discussed the updating method of focusing operator,the results of theoretical model test...

With operator-driven replacing model-driven,operator-update replacing velocity-update,the common focusing point(CFP)imaging method could avoid problems of strict requirements for velocity model and difficulties in velocity model updating in prestack depth migration process.CFP approach is suitable for imaging in complex near surface geology.In this article,the author made a description of the double focusing imaging method,discussed the updating method of focusing operator,the results of theoretical model test and listed the other applications of the CFP technology.

共聚集点 (CFP)叠加成像方法以算子驱动代替模型驱动 ,以算子修正代替速度修正 ,可以避免叠前深度偏移对速度模型的要求太高 ,速度模型修正比较困难的问题 ,适用于复杂地表地质条件下的构造成像处理。论述了两次聚焦成像的原理 ,讨论了聚焦算子的修改方法 ,并给出了一个理论模型试算结果及CFP的其他应用。

In face of the problem of building prestack depth migration velocity model, the paper deeply studied two methods for inversion of operator and velocity model in CFP half migration domain,that is synchronous inversion and asynchronous inversion.The former adjusts DTS response to align gather's event and to position zero timing line by changing velocity model.Each change of velocity model is followed by calculating focusing operator,CFP gather and DTS response and then using DTS response to calculate corrections...

In face of the problem of building prestack depth migration velocity model, the paper deeply studied two methods for inversion of operator and velocity model in CFP half migration domain,that is synchronous inversion and asynchronous inversion.The former adjusts DTS response to align gather's event and to position zero timing line by changing velocity model.Each change of velocity model is followed by calculating focusing operator,CFP gather and DTS response and then using DTS response to calculate corrections of velocity model.The method mainly uses isochronal principle,in which the modification of velocity model and the picking up DTS gather are closely related together.The method is straightforward and reliable.The main efforts are in picking up DTS response.The asynchronous inversion of operator and velocity model is iterative calculation of correct focusing operator first according to the principle of error symmetry,then inversion of velocity model is proceeded on the basis of operator separately,that bears no relation to picking up DTS response.The method got velocity model indirectly but greatly reduced the work effort of picking up. In comparison with velocity analyzing method in an ordinary migration domain,the analysis in CFP half migration domain can be carried out at single geometric point on reflection interface and no windowed re migration is needed,which greatly reduced computational effort;furthermore,there is no assumption of short offset or small dip that often exists in ordinary migration methods,that is suitable for analysis of migration velocity in complicated subsurface medium.The test results with synthetic and real data show that the method is feasible.

针对叠前深度偏移速度模型的建立 ,本文深入研究了应用 CFP技术进行速度模型反演的两种方法 (即同步反演和异步反演 )。同步反演是指同时反演聚焦算子和速度模型 ,通过调整速度模型来调整 DTS响应 ,使道集拉平并且位于零线 ,每一次调整速度模型之后都要计算聚焦算子、CFP道集和 DTS响应 ,并根据 DTS响应计算速度模型的修正量。这种方法基于等时原理 ,速度模型的调整和 DTS道集的拾取紧密联系在一起 ,该方法直观可靠 ,主要工作量在于 DTS响应的拾取。算子和速度模型的异步反演则是先根据误差对称准则迭代计算正确的聚焦算子 ,然后根据算子反演速度模型 ,两个步骤截然分开 ,速度模型的反演不再涉及 DTS响应的拾取 ,该方法间接求取速度模型 ,大大减少了拾取的工作量。和常规的偏移速度分析方法相比 ,CFP方法可以在反射界面的单个几何点上进行 ,不需要区域性重复偏移 ,大大减少了计算量 ;它也不需要常规方法中的小炮检距假设或小倾角假设 ,适宜复杂地下介质的偏移速度分析。文中合成记录的速度反演取得了满意的结果 ,并对实际资料的反演进行了初步实验。

 
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