分偏移距动校正技术

Offset division normal moveout correction

1. Geophysical Prospecting Institute of SINOPEC Shengli Oilfield, Dongying 257022, China;2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10010, China

动校正技术在地震资料处理过程中起着至关重要的作用。常规的动校正方法一般都忽略了偏移距对动校正速度的影响, 致使动校正结果不尽如人意; 同时也影响了静校正的结果, 使动、静校正后的地震道集内还存在着动、静态时移, 从而影响资料的叠加和偏移成像。

Normal moveout (NMO) correction plays a vital role in seismic data processing. The failure of conventional NMO correction methods is due to indifference to the effects of different offsets on NMO velocity, which in turn affects statics. There are residual moveout and static time shift in the seismic gather after NMO and static corrections, leading to poor stacking and migration imaging. The paper discusses the offset division NMO correction method. On the ground of the effects of different offsets on NMO velocity, this method can eliminate the residual moveout in CMP gather effectively. Therefore the continuity and smoothness of seismic events are improved.