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| 四参数速度分析法及其在垦71区 三维转换波处理中的应用 |
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毕丽飞1,2,刘江平1,周永红3,王延光2,王慧2,石建新2,李向阳4
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(1.中国地质大学(武汉)地球物理与空间信息学院，湖北武汉430074 ;2.中石化胜利油田物探院，山东东营257001;3.中石化胜利油田职工大学，山东东营257000 ;4.英国地质调查局，英国爱丁堡EHWLA)
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| 摘要: |
| 胜利油田垦71地区多分量地震数据采用微型机电系统(MEMS)数字检波器采集，受转换波的非对称路径和 各向异性的影响,剖面中非双曲同相轴广泛存在。传统的速度分析法基于各向同性理论，动校正时无法把同相轴拉 平。为了实现同相轴的同相叠加,利用不同偏移距的动校正信息估算不同的参数，提出了一种新的四参数速度分析 法。四参数指转换波叠加速度《C2、垂直速度比7。、等效速度比y#和转换波各向异性系数AU。应用该方法对胜利油 田垦71地区三维多波资料进行了处理。结果表明，该方法处理效果较好，且对该地区多分量资料的成像质量及PP '波与PS波同相轴的相关性也有很大的改进。 |
| 关键词: 地震资料处理；转换波；四参数理论 .速度分析；动校正信息；参数估算 |
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| 基金项目:国家自然科学基金项目(2003BA613A) |
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| Four-parameter velocity analysis and its application to seismic data of Ken-71 area in Shengli Oilfield |
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BI Li-fei1,2,LIU Jiang-ping1,ZHOU Yong-hong3,WANG Yan-guang2,WANG Hui2,SHI Jian-xin2,LI Xiang-yang4
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(1. Institute of Geophysics Geomatics 9 China University of Geosciences, Wuhan 430074, China;2. Geophysical Research Institute of Shengli Oilfield，SIN OPEC y Dongying 257001, Shandong Province，China;3. Staff University of Shengli Oilfield，SINOPEC9 Dongying 257000, Chirm;4. British Geological Survey, Edinburgh EH93LA, UK)
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| Abstract: |
| The multi-component seismic data were acquired by digital micro-electro-mechanical system (MEMS) sensors of Ken-71 area in Shengli Oilfield. Both the asymmetry ray path and the anisotropic effects result in the serious non-hyperbolic move-out effects in the converted-wave data. Conventional velocity analysis based on isotropic theory can no longer flatten the move-out. Four-parameter theory was used to evaluate these effects and process the data. These four parameters include the PS converted wave stacking velocity , the vertical velocity ratio (y0) , the effective velocity ratio (y#) and the anisotropy parameter The method utilizes the move-out information at different offsets to estimate the different parameters, |
| Key words: seismic data processing converted-wave four-parameter theory velocity analysis move-out information estimation of parameter |
