新疆石油地质

新疆石油地质 ›› 2009, Vol. 30 ›› Issue (4): 523-525.

• 应用技术 • 上一篇    下一篇

起伏地表速度建模初步研究

潘艳梅, 刘玉柱, 杨锴   

  1. 同济大学 海洋与地球科学学院,上海 200092
  • 收稿日期:2009-02-13 修回日期:2009-05-31 出版日期:2009-08-01 发布日期:2020-08-25
  • 作者简介:潘艳梅（1976-）,女,山西运城人,在读博士研究生,固体地球物理学, （Tel）021-26370516（E-mail）gxlpym@yahoo.cn.
  • 基金资助:
    国家自然科学基金（40804023）与国家重点基础研究发展规划项目（2006CB202402）共同资助

Preliminary Study on Velocity Modeling for Irregular Surface

PAN Yan-mei, LIU Yu-zhu, YANG Kai   

  1. School of Ocean & Earth Science, Tongji University, Shanghai 200092, China
  • Received:2009-02-13 Revised:2009-05-31 Online:2009-08-01 Published:2020-08-25

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摘要： 针对新疆山前带地形起伏、表层结构复杂以及横向变速剧烈的特点,采用初至波波形反演方法进行表层速度精细建模。模型试算结果表明,该方法能够较好地重建近地表速度模型的细节部分;时间域波形反演方法的实现效果较大程度地依赖初始模型。正演模拟证明,表层对地震波传播的影响很大,倾角较大且横向变速剧烈的模型,正演模拟的精度、横向分辨率以及照明效果都会受到表层的影响,并且最终影响了反演结果的精度和分辨率。

关键词: 起伏地表, 速度建模, 初至波, 波形反演, 目标函数

Abstract: Aiming at the complex geological structures with the topographic relief, complex surface structures and strong velocity contrast in the mountain front area in Xinjiang, the first-arrival waveform inversion is adopted for detailed modeling of surface velocity. The results show that first-arrival waveform inversion can be used to reconstruct the fine details of the surface velocity model. Time-domain waveform inversion is somewhat sensitive to the initial model. The forward modeling indicates that seismic wave propagation is severely affected by the surface structure. The modeling precision, lateral resolution and illumination could be influenced by the irregular topography model with large dip and strong velocity contrast, hence leading to lower degrees of the modeling precision and resolution.

Key words: irregular surface, velocity modeling, first-arrival, waveform inversion, objective function

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