[an error occurred while processing this directive] 世界地质 2020, 39(4) 905-911 DOI:   10.3969/j.issn.1004-5589.2020.04.016  ISSN: 1004-5589 CN: 22-1111/P
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波阻抗
共轭梯度法
地震反演
预条件
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尹德强
PubMed
Article by Yin D
基于预条件共轭梯度法的宽带约束波阻抗反演
尹德强
中国电力工程顾问集团东北电力设计院有限公司, 长春 130021
摘要： 以地质信息、测井资料为约束条件，构建宽频带初始波阻抗模型，研究参数置换法建立拟线性矩阵方程，对反演解加入硬约束条件，采用非线性预条件共轭梯度数值算法，改进搜索方向，降低系数矩阵条件数，提高收敛速度，实现从带限的地震数据资料中恢复出宽频带波阻抗的空间分布特征。通过砂泥岩互层复杂速度模型数值反演，在5%的随机噪声干扰下，反演得到速度模型也能够描述出储层和逆断层的位置，由于噪音强度分布不同，造成各道反演得到的绝对速度值存在偏差，但最大偏差值仅为真实值的±5%。进一步验证算法可行有效，反演精度高，具有一定的抗噪能力。
关键词： 波阻抗   共轭梯度法   地震反演   预条件  
Broadband constrained wave impedance inversion based on preconditioned conjugate gradient method
YIN De-qiang
Northeast Electric Power Design Institute Limited Company of China Power Engineering Consulting Group, Changchun 130021, China
Abstract: The geological information and logging data were used as constraints to build a broadband initial wave impedance model. The quasi-linear matrix equation was established by the parametric substitution method, and the mandatory constraint condition was added to the inversion solutions. Moreover, the nonlinear preconditioned conjugate gradient numerical algorithm was adopted to improve the search direction to reduce the condition number of the coefficient matrix and improve the convergence speed. The spatial distribution characteristics of the broadband wave impedance was then recovered from the limited seismic data. The numerical inversion result of the complex velocity model of sand-shale interbeds proves that under the interference of 5% random noise, the velocity model obtained by the inversion can describe the position of the reservoir and the reverse fault. Due to different noise intensity distributions, the absolute velocity values obtained from the inversions of each track have deviations, but the maximum deviation value is only about 5% of the true value. It is further verified that the algorithm is feasible and effective, with high inversion precision and certain denoising ability.
Keywords: impedance   conjugate gradient method   seismic inversion   precondition  
收稿日期 2019-10-22 修回日期 2020-07-10 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2020.04.016
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