均衡DMO的资料处理效果

The data processing effect by equalizing DMO

倾角时差校正(DMO)技术是当前一项非常重要的地震资料处理技术。它能够在叠前通过特定的速度分析和倾角时差计算,消除正常时差校正(NMO)无法消除的地层倾角影响,实现叠前部分偏移,从而提高剖面叠加质量。对于野外施工规则、覆盖次数均匀的资料,常规DMO处理效果好;但对于由于野外施工不规则或丢道而造成覆盖次数不均匀的资料,常规DMO达不到理想处理效果;在覆盖次数低的区域,常规DMO常引起斜干扰和空间假频。本文介绍的均衡DMO(EQ-DMO)能够消除上述影响。文章简单介绍了均衡DMO的基本原理,通过试验,验证了均衡DMO在覆盖次数不均匀的地震资料处理中的作用。

Currently DMO technique (Dip MoveOut correction technique) is a very important seismic data processingtechnique. It can eliminate the influence of the layer dip which Normal Moveout correction cannot do by analyzing thespecial velocity and computing the dip moveout , to implement the partial migration of pre-stack and achieve thepurpose of improving the quality of stack profile. Though the routine DMO processing is fit well into the data withregular field prospect and uniform fold multiplicity, it is not as far as its capacity to the data with unequal foldmultiplicity as a result of irregular field prospect or losing traces. In the zone of lower fold multiplicity it can oftenbring slant interference and spatial alias frequency. Under this condition EQ-DMO (Equalized DMO) shows itsadvantages. This text is used to test the importance of EQ-DMO in the data processing of irregular fold multiplicity byanalyzing the effect of EQ-DMO in practical use after simply given basic principle.