| Analysis and application of pseudo-offset method in the converted-wave prestack time migration |
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| 作者姓名： | Zhang Liyan Liu Yang |
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| 作者单位： | CNPC Key Lab of Geophysical Exploration, ina University of Petroleum, Beijing 102249. |
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| 基金项目： | this work is sponsored by the Nation＇s Key Scientific ＆ Technologic Projects （2003 BA613-09）. |
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| 摘 要： | Pseudo-offset migration （POM） is a new method for prestack time migration of converted waves that improves on equivalent-offset migration （EOM）. The mapping of POM is different than EOM but the purpose of the two methods is to map the input samples to the common conversion scatter point （CCSP） gathers. This paper introduces the principles of the two migration methods and model parameter sensitivity tests for both POM and EOM. At large offset-to-depth ratios the hyperbolic approximation, the three-term approximation and the double square root （DSR） equation are used to NMO-correct the mapped POM gathers to obtain more accurate migration velocities. These equations were derived and calculated by small pseudo offset. POM is then used to image complex structure and prestack time migration.
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| 关 键 词： | 转换波 POM EOM 时间偏移 动校正 地震勘探 |
| 收稿时间： | 2005-09-28 |
| 修稿时间： | 2005-09-282006-02-20 |
Analysis and application of pseudo-offset method in the converted-wave prestack time migration |
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| Zhang Liyan Liu Yang.Analysis and application of pseudo-offset method in the converted-wave prestack time migration[J].Applied Geophysics,2006,3(1):18-26. |
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| Authors: | Zhang;Liyan;Liu;Yang |
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| Abstract: | |
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| Keywords: | converted-wave Pseudo-offset migration equivalent-offset migration time migration NMO correction |
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