| 利用零偏移距VSP资料在小波域计算介质Q值 |
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| 引用本文： | 赵伟,葛艳.利用零偏移距VSP资料在小波域计算介质Q值[J].地球物理学报,2008,51(4):1202-1208. |
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| 作者姓名： | 赵伟 葛艳 |
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| 作者单位： | 1.中国石油大学（北京），北京 102249;2.中国海洋石油研究中心技术研究部，北京 100027;3.西安交通大学电子与信息工程学院波动与信息研究所, 西安 710049 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 讨论了地震子波为一般零相位子波情况下，利用零偏移距垂直地震剖面(VSP)资料在时-频域计算Q值方法．以Morlet小波为基本小波，基于单程波传播理论, 在地震子波为一般的零相位子波情况下，推导出了在时-频域计算Q值的公式．通过对横坐标作恰当的非线性变换后，该公式在形式上与地震子波为脉冲时的计算公式类似．文中采用VSP正演记录，验证了本文提出的方法的正确性．文中还讨论了在时-频域恰当地选择有效频带，降低反射波对Q值计算结果影响的方法．
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| 关 键 词： | 介质Q值 垂直地震剖面 小波变换 |
| 收稿时间： | 2007-5-11 |
| 修稿时间： | 2008-3-10 |
Estimation of Q from VSP data with zero offset in wavelet domain |
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| ZHAO Wei,GE Yan.Estimation of Q from VSP data with zero offset in wavelet domain[J].Chinese Journal of Geophysics,2008,51(4):1202-1208. |
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| Authors: | ZHAO Wei GE Yan |
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| Institution: | 1.Faculty of Natural Resources and Information Techonology, University of Petroleum, Beijing 102249, China;2.Technology Research Dept., CNOOC Research Center, Beijing 100027, China;3.Wave and Information Institute, School of Electronic and Information Engineering, Xi′an Jiaotong University, Xi′an 710049, China |
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| Abstract: | This paper is devoted to the estimation of Q-factor in dispersive medium from zero offset VSP data in the wavelet domain. Suppose that the source signature can be approximated by a wavelet with zero-phase, we obtain a formula with which one can calculate the Q-factor from VSP data in the wavelet domain. By taking a proper coordinate frame transform, our formula has a similar form with the counterpart for the source signature to be pulse. By using the method on synthetic VSP data, we estimate the Q which are nearly the same as model parameters. In addition our method can decrease the effect from near reflector. |
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| Keywords: | Q-factor VSP Wavelet transform |
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