| 波动方程法共成像点道集偏移速度建模 |
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| 引用本文： | 李振春,姚云霞,马在田,王华忠.波动方程法共成像点道集偏移速度建模[J].地球物理学报,2003,46(1):86-93. |
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| 作者姓名： | 李振春 姚云霞 马在田 王华忠 |
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| 作者单位： | 1. 石油大学地球资源与信息学院,山东,东营,257061
2. 同济大学海洋地质与地球物理系,上海,200092 |
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| 基金项目： | 国家自然科学基金资助项目 (498941 90-0 2 4 ) . |
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| 摘 要： | 叠前深度偏移的成像效果对偏移速度场相当敏感，建立正确的偏移速度场是实现高质量叠前深度偏移成像的关键。首先应用成像精度高的波动方程法叠前深度偏移抽取共成像点道集；然后基于摄动法通过参数化速度函数和改进的剩余曲率分析建立偏移速度误差和成像深度误差的定量关系；最后采用单参数／多参数联合迭代反演实现偏移速度建模。对Marmousi模型的试算结果表明：该方法对复杂地质体具有较强的适应性和较好的建模和成像效果，一般只需分析和控制主要反射层，通过3－4次近代就可以满足精度要求。
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| 关 键 词： | 波动方程 偏移速度 反演 Marmousi模型 地震勘探 摄动法 地质体 |
| 文章编号： | 0001-5733(2003)01-86-08 |
COMMON IMAGING POINT GATHER MIGRATION VELOCITY MODELING BASED ON WAVE EQUATION |
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| LI ZHENCHUN YAO YUNXIA MA ZAITIAN WANG HUAZHONG The University of Petroleum,Dongying ,China Tongji University,Shanghai ,China.COMMON IMAGING POINT GATHER MIGRATION VELOCITY MODELING BASED ON WAVE EQUATION[J].Chinese Journal of Geophysics,2003,46(1):86-93. |
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| Authors: | LI ZHENCHUN YAO YUNXIA MA ZAITIAN WANG HUAZHONG The University of Petroleum Dongying China Tongji University Shanghai China |
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| Affiliation: | LI ZHENCHUN1 YAO YUNXIA1 MA ZAITIAN2 WANG HUAZHONG2 1 The University of Petroleum,Dongying 257061,China 2 Tongji University,Shanghai 200092,China |
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| Abstract: | The imaging result of prestack depth migration(Pre-SDM)is quite sensitive to the migration velocity field,So a reasonable migration velocity modeling is the key to obtain the Pre-SDM imaging with high quality.Firstly,common imaging point(CIP)gathers are extracted by using wave equation Pre-SDM with high imaging precision.Then,based on the perturbation method,the quantitative relationship between the errors in migration velocity and those in imaged depth is established through the parameterized velocity function and the modified residual curvature analysis(RCA).Finally,the migration velocity modeling is realized using the single/muhi parameter joint-iteration inversion.The test on Marmousi model shows that the method put forward in this paper has a stronger adaptability and better modeling and imaging results for complex geological bodies,and it is enough to only analyze and control the main reflectors through 3 to 4 iterations to meet the required precision. |
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| Keywords: | Wave equation CIP gather Migration velocity modeling Modified RCA Single/multi parameter iteration inversion Parameterized velocity function Marmousi model |
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