| 速度光滑对反射地震信号的影响分析 |
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| 引用本文： | 魏脯力,孙建国,孟祥羽,徐杨杨,刘明忱,商耀达.速度光滑对反射地震信号的影响分析[J].地球物理学报,1954,63(10):3849-3856. |
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| 作者姓名： | 魏脯力 孙建国 孟祥羽 徐杨杨 刘明忱 商耀达 |
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| 作者单位： | 吉林大学地球探测科学与技术学院, 长春 130026 |
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| 基金项目： | 国家自然科学基金项目（41974135）资助. |
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| 摘 要： | 光滑处理使得单界面成为非均匀薄层，界面反射转变为层反射.为了探讨光滑处理的影响，以平面波作为入射波场，首先利用过渡层反射系数推导了反射信号的理论公式，然后就非均匀薄层下反射系数的计算问题，给出了具体的实现算法，并通过与经典Epstein过渡层反射系数解析结果的对比说明了算法的精度.最后在单界面及其被光滑后界面的对比分析中，得出了几点重要结论：随着光滑次数的增加，反射信号的到时基本保持不变，而反射信号的主频与能量呈减少趋势，其中信号能量在低光滑次数的衰减速率明显大于高光滑次数.
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| 关 键 词： | 平面波 反射系数 光滑 软界面 信号能量 |
| 收稿时间： | 2019-11-27 |
Influence of smoothing velocity on reflected seismic signal |
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| WEI PuLi,SUN JianGuo,MENG XiangYu,XU YangYang,LIU MingChen,SHANG YaoDa.Influence of smoothing velocity on reflected seismic signal[J].Chinese Journal of Geophysics,1954,63(10):3849-3856. |
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| Authors: | WEI PuLi SUN JianGuo MENG XiangYu XU YangYang LIU MingChen SHANG YaoDa |
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| Institution: | College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | The usual velocity interface can be converted into an inhomogeneous thin layer by smoothing, making the layer reflection different from original interface reflection obviously. In order to analyze the influence such smoothing on reflected wave signal quantitatively, we take an incident plane wave into account and derive the formula of the reflected signal that is expressed by the reflection coefficient of the corresponding inhomogeneous thin layer. An iterative solution to reflection coefficient equation is used to obtain its reflection coefficient, and we make sure the accuracy of this iteration algorithm in comparison with analytical results in the classical Epstein transition layer. Comparison of final received signals reflected by the usual interface and that by its smoothed inhomogeneous thin layer shows that the arrival time of reflected wave signal remains unchanged while its dominant frequency and energy decrease as the number of smoothing increases. In particular, the signal energy with low smoothing number decreases more faster than that with high smoothing number. |
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| Keywords: | Plane wave Reflection coefficient Smoothing Soft interface Signal energy |
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