| 河流相砂泥岩薄互层地震反射特征研究 |
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| 引用本文： | 李国发,熊金良,周辉,翟通利.河流相砂泥岩薄互层地震反射特征研究[J].应用地球物理,2008,5(3):219-229. |
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| 作者姓名： | 李国发 熊金良 周辉 翟通利 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家高技术研究发展计划(863计划) |
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| 摘 要： | A sedimentary geological model is established in order to study the seismic reflection characteristics of channel sand bodies. Synthetic seismic shot gathers are simulated using the acoustic wave equation and then are prestack time migrated. On the imaged data, the reflection characteristics and instantaneous attributes are analyzed and log-constrained impedance inversion is tested. Because of wave field interference, the experimental results show that seismic events do not definitely correspond to the channel sand bodies and that seismic modes of occurrence do not represent the actual ones. The seismic events formed by wave interference may lead to errors and pitfalls in sand body interpretation. The corresponding relations between instantaneous seismic attributes and sedimentary sands are not well established. Log-constrained impedance inversion improves the resolution of channel sands. However, if the inverted resolution is forced to be too high, artifacts related to the initial model may occur.
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| 关 键 词： | 地震反射性状 河床砂 波场模拟 阻抗倒置 |
Seismic reflection characteristics of fluvial sand and shale interbedded layers |
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| Guofa Li,Jinliang Xiong,Hui Zhou,Tongli Zhai.Seismic reflection characteristics of fluvial sand and shale interbedded layers[J].Applied Geophysics,2008,5(3):219-229. |
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| Authors: | Guofa Li Jinliang Xiong Hui Zhou Tongli Zhai |
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| Institution: | [1]CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum, Beijing 102249, China [2]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China [3]Dagang Oil Field, PetroChina, Tianjin 300280, China |
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| Abstract: | A sedimentary geological model is established in order to study the seismic reflection characteristics of channel sand bodies. Synthetic seismic shot gathers are simulated using the acoustic wave equation and then are prestack time migrated. On the imaged data,the reflection characteristics and instantaneous attributes are analyzed and log-constrained impedance inversion is tested. Because of wave field interference, the experimental results show that seismic events do not definitely correspond to the channel sand bodies and that seismic modes of occurrence do not represent the actual ones. The seismic events formed by wave interference may lead to errors and pitfalls in sand body interpretation. The corresponding relations between instantaneous seismic attributes and sedimentary sands are not well established. Log-constrained impedance inversion improves the resolution of channel sands. However, if the inverted resolution is forced to be too high, artifacts related to the initial model may occur. |
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| Keywords: | Continental sedimentation channel sand wave field simulation wavelet interference impedance inversion |
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