| 基于短算子设计的黏性介质叠前时间偏移 |
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| 引用本文： | 李雪英,吕喜滨,张剑锋.基于短算子设计的黏性介质叠前时间偏移[J].地球物理学报,2011,54(1):193-199. |
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| 作者姓名： | 李雪英 吕喜滨 张剑锋 |
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| 作者单位： | 1. 东北石油大学地球科学学院,大庆 163318;
2. 中国科学院地质与地球物理研究所, 北京 100029 |
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| 基金项目： | 国家自然科学基金重点项目，国家油气重大专项 |
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| 摘 要： | 为了提高频域黏性介质叠前时间偏移的计算效率,本文采用加权最小平方方法设计高精度的、最优时域褶积短算子,发展了一套表驱动的时域黏性介质叠前时间偏移方法.该方法将大量的逐频率补偿运算转化为少量的时域褶积运算,并将走时,振幅表和补偿褶积短算子系数表的计算过程与补偿成像过程相剥离,提高了时域算法的计算效率;通过控制最大的补偿因...
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| 关 键 词： | 黏性介质 叠前时间偏移 褶积短算子 加权最小平方方法 表驱动 |
| 收稿时间： | 2010-02-26 |
Prestack time migration in anelastic media based on designing for short operator |
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| LI Xue-Ying,L Xi-Bin,ZHANG Jian-Feng.Prestack time migration in anelastic media based on designing for short operator[J].Chinese Journal of Geophysics,2011,54(1):193-199. |
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| Authors: | LI Xue-Ying L Xi-Bin ZHANG Jian-Feng |
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| Institution: | 1. College of Earth Sciences,Northeast Petroleum University, Daqing 163318, China;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | In order to raise the computational efficiency of frequency domain prestack time migration in anelastic media, the high-accuracy optimum short convolution operators in time domain are designed by weighted least squares method. Therefore a table-driven time domain prestack time migration scheme in anelastic media is presented. This scheme can transform large amount of multiplication operation frequency by frequency into less convolution operation in time domain and split calculation of travel time, amplitude and short convolution operator from the inverse Q compensation migration, which greatly improved the computational efficiency of time-domain pre-stack time migration in anelastic media. A stabilization controlling strategy is proposed to ensure the stability of arithmetic in compensation for absorption and dispersion. Numerical examples indicate that the short convolution operator has very high accuracy designed by weighted least squares method. The algorithm in time domain can achieve the same compensation result as in frequency domain while its computational cost is close to the conventional prestack time migration. |
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| Keywords: | Anelastic media Prestack time migration Short convolution operator Weighted least squares method Table-driven |
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