| 井间电磁波CT中的非块体分段反演算法 |
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| 引用本文： | 吴建平,冯锐.井间电磁波CT中的非块体分段反演算法[J].CT理论与应用研究,1993(3). |
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| 作者姓名： | 吴建平 冯锐 |
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| 作者单位： | 国家地震局地球物理研究所 100081
(吴建平)，国家地震局地球物理研究所 100081(冯锐) |
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| 摘 要： | 本文给出了用网格节点表示的介质中直射线追踪的算法。在实际工作中,我们常发现当井间CT 应用于强不均匀体存在的区域时,反演结果往往会严重失真,为了解决这一问题,我们采用对测量数据分段反演的新算法。首先利用强信号(即弱衰减)确定衰减量较小的背景介质的衰减系数,固定背景介质的衰减系数(或对其加入强约束),然后逐渐用较弱的信号确定衰减系数较大的介质在井间的分布,直至反演出整个井间的吸收系数分布。实践表明,当强不均匀体存在时,运用这一方法得到的结果明显优于不作分段时得到的结果。
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| 关 键 词： | 非块体分段反演 井间CT |
Nobody Inversion Using Data Segments in Crosshole Electromagnetic Tomography |
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| Wu Jianping Feng Rui.Nobody Inversion Using Data Segments in Crosshole Electromagnetic Tomography[J].Computerized Tomography Theory and Applications,1993(3). |
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| Authors: | Wu Jianping Feng Rui |
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| Abstract: | In this paper the rectangular grid-based ray tracing algorithm was given.Ininversion we often find when there exist strong absorption anomalies between two wells,the result of inversion is usually far from the real situation.In this paper we presents anew method to resolve the problem.We divided the observed data into several segments asits value.Firstly,we use the strongest signals to inverse the small absorbtion coefficientsas background medium to the next step.Secondly,keeping the absorption coefficients ofbackground unchanged or with strict restrain,we use the weaker signals to inverse thelarger absorption coef(?)icients.In this way,all coefficients between two wells we needed canbe obtained.In practical work,the results obtained by this method is usually much betterthan the others when there exists strong absortion anomalies between two wells. |
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| Keywords: | Nobody inversion using data segments Crosshole tomography |
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