| Wigner-Ville分布及其在地震衰减估计中的应用 |
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| 引用本文： | 李艳东,郑晓东.Wigner-Ville分布及其在地震衰减估计中的应用[J].应用地球物理,2007,4(4):245-254. |
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| 作者姓名： | 李艳东 郑晓东 |
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| 作者单位： | 中国石油勘探开发研究院物探技术所，中国石油勘探开发研究院物探技术所 北京 100083，北京 100083 |
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| 基金项目： | The project is supported by China Postdoctoral Science Foundation and the Innovation Fund for the Young Scientists, Research Institute of Petroleum Exploration and Development,PetroChina Company Limited. |
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| 摘 要： | 地震信号的衰减一般是在频域内利用信号功率谱的统计性质进行表征。但是,传统的基于傅立叶变换的功率谱估计方法的分辨率较低,使得衰减估计的精度较低。Wigner-Ville分布是一种重要的Cohen类时频分布,它具有一系列的优良性质,如时频边缘分布性质、好的时频聚集性等。这些性质对信号的时频分析具有重要意义。因此,Wigner-Ville分布为地震信号的衰减估计提供了新的手段。本文首先介绍了Wigner-Ville分布以及能够减少或消除交叉项影响的平滑Wigner-Ville分布,然后,提出了一种基于Wigner-Ville分布的衰减估计方法。在这一方法中,利用Wigner-Ville分布得到的瞬时能量谱中高频段的能量下降速率度量衰减。将这一方法应用到塔中地区奥陶系礁滩相碳酸盐岩储层预测,结果表明,基于Wigner-Ville分布的衰减能够有效地检测出礁滩相带和泻湖区域之间衰减特性的差异。
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| 关 键 词： | Wigner-Ville分布 时频分布 地震衰减 储层预测 |
| 修稿时间： | 2007-07-31 |
Wigner-Ville distribution and its application in seismic attenuation estimation |
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| Yandong Li,Xiaodong Zheng.Wigner-Ville distribution and its application in seismic attenuation estimation[J].Applied Geophysics,2007,4(4):245-254. |
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| Authors: | Yandong Li Xiaodong Zheng |
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| Institution: | (1) Geophysical Department, Research Institute of Petroleum Exploration and Development, PetroChina Company Limited, Beijing, 100083, China |
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| Abstract: | The attenuation of seismic signals is often characterized in the frequency domain using statistical measures of the power spectrum.However,the conventional Fourier transform-based power spectrum estimation methods suffer from time-frequency resolution problems.Wigner-Ville distribution,which is a member of Cohen class time-frequency distributions,possesses many appealing properties,such as time-frequency marginal distribution,time-frequency localization,etc.Therefore,Wigner-Ville distribution offers a new way for estimating the attenuation of seismic signals.This paper initially gives a brief introduction to Wigner-Ville distribution and the smoothed Wigner-Ville distribution that is effective in reducing the cross-term effect,and then presents a method for seismic attenuation estimation based on the instantaneous energy spectrum of the Wigner-Ville distribution.A real data example from central Tarim Basin in western China is presented to illustrate the effectiveness of the proposed method.The results show that the Wigner-Ville distribution- based seismic attenuation estimation method can effectively detect the difference between reef,shoal and lagoon facies by their attenuation properties,indicating that the estimated seismic attenuation can be used for reef and shoal carbonate reservoir characterization. |
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| Keywords: | Wigner-Ville distribution time-frequency analysis seismic attenuation reservoir characterization |
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