| 角度域弹性波Kirchhoff叠前深度偏移速度分析方法 |
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| 引用本文： | 杜启振,李芳,侯,秦童,毕丽飞.角度域弹性波Kirchhoff叠前深度偏移速度分析方法[J].地球物理学报,2011,54(5):1327-1339. |
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| 作者姓名： | 杜启振 李芳 侯 秦童 毕丽飞 |
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| 作者单位： | 1. 中国石油大学(华东)地球资源与信息学院,东营 257061;
2. 中国石油大学中国石油天然气集团公司物探重点实验室,北京 102249;
3. 中海石油(中国)有限公司天津分公司勘探开发研究院,天津 300452;
4. 中国石油化工集团公司胜利油田分公司物探研究院,东营 257022 |
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| 基金项目： | 新世纪优秀人才支持计划，山东省自然科学杰出青年科学基金，山东省科技攻关计划项目，山东省自然科学基金重点项目，中国石油天然气集团公司物探重点实验室开放基金 |
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| 摘 要： | 为提高地震成像结果的准确性并真实反映实际地震波场在介质中的传播特性,应该充分利用多分量地震数据的矢量特征进行弹性波成像,其中,最为棘手的问题是纵横波偏移速度场的确定,为此,本文提出了直接利用多分量地震数据进行弹性波角度域偏移速度分析的方法.基于空移成像条件的弹性波Kirchhoff偏移方程提取了弹性波局部偏移距域共成像...
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| 关 键 词： | 角度域共成像点道集 成像深度一致性原则 弹性波偏移速度分析 弹性Kirchhoff偏移 多分量 |
| 收稿时间： | 2010-04-12 |
Angle-domain migration velocity analysis based on elastic-wave Kirchhoff prestack depth migration |
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| DU Qi-Zhen,LI Fang,HOU Bo,QIN Tong,BI Li-Fei.Angle-domain migration velocity analysis based on elastic-wave Kirchhoff prestack depth migration[J].Chinese Journal of Geophysics,2011,54(5):1327-1339. |
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| Authors: | DU Qi-Zhen LI Fang HOU Bo QIN Tong BI Li-Fei |
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| Institution: | 1. School of Earth Resource and Information, China University of Petroleum(East China), Dongying 257061, China;
2. CNPC Key Laboratory of Geophysical Exploration, China University of petroleum(Beijing), Beijing 102249, China;
3. CNOOC Ltd-TianJin Bohai Oilfield E&P Research Institute, Tianjin 300452, China;
4. Geophysical Research Institute of Shengli Oilfield Branch CO., SINOPEC, Dongying 257022, China |
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| Abstract: | To improve the accuracy of seismic imaging and describe the propagation of seismic wavefield more exactly, we need to take full advantage of the vectorial multicomponent seismic data to conduct the elastic wave imaging. However, the great challenge of elastic wave imaging is the migration velocity of P- and S waves. Based on multicomponent seismic data angle-domain common-image gathers (ADCIGs), elastic wave migration velocity analysis is proposed in this paper. Firstly, according to the elastic Kirchhoff migration equation which is based on space shift image condition, P- and PS converted waves subsurface offset-domain common-image gathers (SODCIGs) are extracted and transformed into P-incidence angle-domain common-image gathers (P-ADCIGs) for P- and PS converted waves through the radial-trace transformation in the Fourier domain, respectively. Secondly, P- and PS converted wave residual movement equations were derived, and velocity analysis criteria of image depth consistency for P- and PS converted waves at the same reflector were proposed. We iteratively update the velocities based on residual movement equations for P- and PS converted wave angle-domain common-image gathers. On this basis, elastic wave migration velocity analysis is implemented. The example illustrates that elastic wave migration velocity analysis is successfully applied to the multicomponent seismic field data, suggesting that the method is feasible and applicable. |
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| Keywords: | Angle-domain common-image gathers (ADCIGs) Image depth consistency criterion Elastic wave migration velocity analysis Elastic Kirchhoff migration Multicomponent |
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