旋转变换和viterbi算法在波动方程叠前深度偏移预处理中的应用
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摘要
波动方程叠前深度偏移运算,要求所输入的地震数据网格为规则化网格。在地震数据的野外采集中,由于地形复杂、考虑地下覆盖次数等问题,观测系统多存在变观现象。同时,为了避免由于联络测线方向采样稀疏而产生的空间假频,须要在该方向进行地震道的插值。运用旋转变换解决了测线与坐标轴方向不一致的问题,用viterbi算法完成了同向轴的自动拾取,结果令人满意,为波动方程叠前深度偏移预处理提供了两种有效可行的方法。
In prestack depth migration with wave equation, the input seismic data grid is required to be regularized grid. However, during the field seismic data acquisition, the visual variation occurs in acquisition system, due to complex landscape or relief and seismic coverage times. Such alias produced by sparse samples along the on-line should be interpolated between tracks. This paper deals with the variance between the seismic line and the coordinate orientation by rotation transform and realizes the auto pickup of events by Viterbi algorithm, obtaining satisfactory results. These two methods are feasible to preprocessing of prestack depth migration of wave equation.
In prestack depth migration with wave equation, the input seismic data grid is required to be regularized grid. However, during the field seismic data acquisition, the visual variation occurs in acquisition system, due to complex landscape or relief and seismic coverage times. Such alias produced by sparse samples along the on-line should be interpolated between tracks. This paper deals with the variance between the seismic line and the coordinate orientation by rotation transform and realizes the auto pickup of events by Viterbi algorithm, obtaining satisfactory results. These two methods are feasible to preprocessing of prestack depth migration of wave equation.
引文
[1]梅向明,刘增贤,林向岩.高等几何[M].北京:高等教育出版社,1983.
[2]?ZYilmaz.Processing,inversion,andinterpretationofseismicdata:VolumeIandVolumeⅡ[C]SocietyofExplorationGeophysicists,2001.
[2]?ZYilmaz.Processing,inversion,andinterpretationofseismicdata:VolumeIandVolumeⅡ[C]SocietyofExplorationGeophysicists,2001.
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