EQ-DMO在资料处理中的应用效果分析

Applied effect analysis of EQ-DMO in data processing

1. 江汉石油学院,湖北荆州434023;2. 中国石化胜利油田有限公司物探研究院,山东东营257022

1. Jianghan Institute of Petroleum, Jingzhou 434023, China;2. Geophysical Research Institute of Shengli Oilfield Limited Company, Dongying 257022, China

DMO技术 (倾角时差校正技术 )是当前一项非常重要的资料处理技术。它主要是针对叠前能识别出倾角的道集中 (如共炮检距道集 ), 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的影响, 以实现叠前部分偏移, 达到提高剖面叠加质量的目的。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就显得有些力不从心, 在覆盖次数低的区域常会引起斜干扰和空间假频, 这时EQ-DMO(即均衡DMO)就显示出了它的优势。在简单给出EQ-DMO基本原理的基础上, 通过实际应用中的效果分析, 来验证EQ-DMO在覆盖次数不均匀资料处理中的重要性, 进而结合实际资料, 给出关于EQ-DMO在实际应用中的几点体会。

Currently DMO technique(Dip Moveout correction technique) is a very important data processing technique. It is principally aimed at the steeply dipping layers existent in the data. In the pre-stack gather which can distinguish the dip (such as common offset gather), it can eliminate the influence of the layer dip which Normal Moveout correction cannot do by analyzing the special velocity and computing the dip moveout , to implement the partial migration of pre-stack and achieve the purpose of improving the quality of stack profile. Though the routine DMO processing is fit well into the data with regular field prospect and uniform fold multiplicity, it is not as far as its capacity to the data with unequal fold multiplicity as a result of irregular field prospect or losing traces. In the zone of lower fold multiplicity it can often bring slant interference and spatial alias frequency. Under this condition EQ-DMO (Equalized DMO) shows its advantages. This text is used to test the importance of EQ-DMO in the data processing of irregular fold multiplicity by analyzing the effect of EQ-DMO in practical use after simply given basic principle. Furthermore I give my some experiences on practical use of EQ-DMO by combining my practice.