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| 基于时频分析的地震道集校平技术应用 |
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慎国强1,2, 王玉梅2, 孟宪军2, 陆文凯3, 李霞2
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(1.中国石油大学 地球资源与信息学院,山东 东营 257061;2.胜利油田 物探研究院,山东 东营 257022;3.清华大学 信息科学技术学院,北京 100084)
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| 摘要: |
| 依据现代信号分析理论,对叠前地震道集剩余动校正量的消除技术进行研究,在模型数据和实际数据的试验基础上,探讨基于时频分析技术的叠前道集校平方法。结果表明:通过对地震信号进行时频分解,并在信号重构时完成高精度的剩余动校正量的消除,处理前后信号振幅不变, 道集同相性增强,叠加后信号有效频带变宽;利用近偏移距地震道的叠加道作为模型道,在有效消除剩余时差和校平同相轴的同时,避免了叠前道集动校拉伸畸变对模型道的影响,保证了技术实现的精度;该方法在消除叠前道集中剩余动校正量方面具有较强的实用性。 |
| 关键词: 时频分析 模型道 道集校平 剩余动校正量 |
| DOI： |
| 分类号::P 631.4 |
| 文献标识码:A |
| 基金项目:国家科技支撑项目(2006BAB03B02) |
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| Application of seismic gather flattening technique based on time frequency analysis |
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SHEN Guo qiang1,2, WANG Yu mei2, MENG Xian jun2, LU Wen kai3, LI Xia2
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(1.College of Geo Resources and Information in China University of Petroleum, Dongying 257061, China;2.Geophysical Research Institute of Shengli Oilfield, Dongying 257022, China;3.School of Information Science and Technology of Tsinghua University, Beijing 100084, China)
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| Abstract: |
| In terms of the modern signal analysis theory and the experiment of model data and actual data, the method based on time frequency analysis to conduct pre stack gather smoothing was discussed through the research of eliminating the residual normal moveout(NMO) of the pre stack gather. The results show that the amplitude remains unchanged after processing, gather in phase increases, and the effective frequency band of the post stack signal broadens by time frequency decomposition seismic signal and high accuracy elimination residual NMO in signal reconstruction. Using sub stack of near offset seismic gather as a model trace, the impact of the dynamic stretching distortion on the model trace is avoided when the residual moveout is eliminated effectively and the event is flattened, thus the accuracy of the technology can be ensured. This method shows practicalness for eliminating the residual NMO in the pre stack gather. |
| Key words: time frequency analysis model trace gather flattening residual nomal moveout |
