| 基于共炮偏移的AVO反演 |
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| 引用本文： | 首皓,刘洪,高建虎.基于共炮偏移的AVO反演[J].应用地球物理,2006,3(2):98-104. |
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| 作者姓名： | 首皓 刘洪 高建虎 |
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| 作者单位： | 中国科学院地质与地球物理研究所，中国科学院地质与地球物理研究所，中国科学院地质与地球物理研究所，中石油勘探开发研究院西北分院 兰州，730000，北京，100029，北京，100029，北京，100029 |
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| 基金项目： | This project is sponsored by the “Pre-Cenozoic Marine Oil and Gas Resource Research around the Bohai Area” of the Knowledge Innovation Project of The Chinese Academy of Sciences (No. KZCX1-SW-18) |
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| 摘 要： | 常规AVO多是利用CMP道集的振幅进行反演。主要有三个方面影响其精度:首先,CMP道集假设地下为水平层状介质,但是实际地下介质多为倾斜地层,地层倾角越大CMP道集的振幅所反映地下介质的位置与实际位置差距就越大。其次,NMO、DMO和反褶积等常规处理流程,都会造成振幅值失真。第三,反演所用的反射系数公式是与入射角有关的量,而欲从CMP道集得到准确的入射角与振幅之间的对应关系,则十分困难。波动方程叠前深度偏移除对复杂介质和陡倾角地层具有较强的成像能力,还可以最大限度的减少常规处理所带来的误差并使振幅归位。本文综合了保幅偏移、角度道集提取以及AVO反演等前人的工作,提出直接从炮集数据反演AVO属性的方法,以期显著减少上述三个因素对AVO反演精度的影响。
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| 关 键 词： | 保幅偏移 反射系数 角度道集 AVO属性 反演 |
| 收稿时间： | 2006-04-04 |
| 修稿时间： | 2006-04-042006-05-29 |
AVO inversion based on common shot migration |
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| Hao Shou,Hong Liu,Jianhu Gao.AVO inversion based on common shot migration[J].Applied Geophysics,2006,3(2):98-104. |
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| Authors: | Hao Shou Hong Liu Jianhu Gao |
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| Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;(2) Northwest Institute, Research Institute of petroleum Exploration and Development, PetroChina, Lanzhou, 730000, China |
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| Abstract: | Conventional AVO inversion utilizes the trace amplitudes of CMP gathers. There are three main factors affecting the accuracy of the inversion. First, CMP gathers are based on the hypothesis of horizontal layers but most real layers are not horizontal. Greater layer dip results in a greater difference between the observed CMP gathers and their real location. Second, conventional processing flows such as NMO, DMO, and deconvolution will distort amplitudes. Third, the formulation of reflection coefficient is related to incidence angles and it is difficult to get the relationship between amplitude and incidence angle. Wave equation prestack depth migration has the ability of imaging complex media and steeply dipping layers. It can reduce the errors of conventional processing and move amplitudes back to their real location. With true amplitude migration, common angle gathers abstraction, and AVO inversion, we suggest a method of AVO inversion from common shot gathers in order to reduce the effect of the above factors and improve the accuracy of AVO inversion. |
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| Keywords: | amplitude preserved migration reflection coefficient angle gather AVO attribute and inversion |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
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