高精度剩余速度分析研究

Analysis of Residual Velocity with High Accuracy

邢兴 赵勇刚 赵永峰

XING Xing ZHAO Yonggang ZHAO Yongfeng

中国石油大港油田公司勘探开发研究院, 天津 300280

Exploration and Development Research Institute of Dagang Oilfield, CNPC, Tianjin 300280, China

针对常规速度分析扫描速度范围大、精度低的缺点，采用高精度剩余速度分析方法，扫描所有地震CDP数据剩余时差，自动拾取精确的叠加速度，形成二维的叠加速度剖面。然而自动拾取会导致速度异常，进而利用局部回归法三维插值算法剔除拾取的异常速度，得到平滑的速度场。该方法提取的速度更加精确，使地震处理中水平叠加、偏移处理达到更好的效果。

In order to overcome the shortcoming of low accuracy and wide scanning speed range existed in the conventional velocity analysis, the high accuracy velocity analysis has been used to scan the residual moveout of all seismic CDP data to pick up automatically the accurate stacking velocity and get a 2D velocity profile. Automatic picking, however, might result in abnormal velocity. 3D interpolation with local regression method is used to eliminate the abnormal velocity and then obtain a smooth velocity field. This method can get more accurate velocity, and improve the effect of horizontal stacking and migration processing.

https://doi.org/10.3969/j.issn.1008-2336.2016.02.037