基于变网格的不同观测系统下的逆时偏移（英文）

发布时间：2018-05-17 06:01

本文选题：井间地震 + 变网格　；参考：《Applied Geophysics》2017年04期

【摘要】：逆时偏移被认为是处理陡倾角断层、回转波和逆掩推覆构造最有效的成像方法。考虑到当今勘探对地下复杂构造体、薄互层和隐蔽储层的高分辨率成像需求,井间、井中地震资料成为地面地震资料的一个很重要的补充。但由于地面地震、井中地震和井间地震存在很大的频率差异,本文将相应的变网格算法应用到偏移中。另外,也将Lanczos滤波引入到波场外推计算中,从而可以很好地消除变网格引起的人为反射。试算表明,对比地面、井中和井间的偏移,可以看到微构造、陡反射层都得到了更好地刻画和描述。基于变网格的逆时偏移在储层预测和岩性解释方面有广阔的应用前景。
[Abstract]:Reverse-time migration is considered to be the most effective imaging method for dealing with steep dip faults, rotational waves and thrust structures. In view of the high resolution imaging requirements of underground complex structures thin interbeds and subtle reservoirs the cross-well and in-well seismic data become an important supplement to the surface seismic data. However, due to the large frequency difference between in-well and cross-well earthquakes due to surface earthquakes, this paper applies the corresponding meshing algorithm to migration. In addition, the Lanczos filter is also introduced into the extrapolation calculation of the wave field, which can eliminate the artificial reflection caused by changing the grid well. The results show that the microstructures can be seen and the steep reflectors can be better characterized and described by comparing the surface, midwell and inter-well migration. Inverse time migration based on grid change has broad application prospect in reservoir prediction and lithology interpretation.
【作者单位】：中国石油大学(华东);海洋国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：supported by the National Natural Science Foundation of China(No.41574098) National Key Research and Development Program(No.2016YFC06011050) National Oil and Gas Major Project(No.2016ZX05006-002)
【分类号】：P631.4

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