非零偏移距DSR叠前深度偏移  

PRESTACK DEPTH MIGRATION BY DSR IN NON-ZERO OFFSET DOMAIN

作　　者：刘文革[1] 贺振华[1] 黄德济[1] 杜增利[2] 

机构地区：[1]成都理工大学信息工程学院,四川成都610059 [2]成都理工大学能源学院,四川成都610059

出　　处：《西南石油大学学报（自然科学版）》2008年第1期43-46,15,共4页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：高等学校博士学科点专项科研基金(20040616001)

摘　　要：提出了非零偏移距域双平方根算子的叠前深度偏移法,该方法根据不同速度模型,通过精确正演模型数据,利用双平方根方程进行偏移,实现了偏移成像和动力学特性研究。研究认为:采用中点-半偏移距域的双平方根算子的叠前深度偏移方法,能够适应横向速度变化,具有精度高、无频散、背景噪声弱、耗时短等优点。对岩性油气藏勘探有重要意义。Double-square-root propagator is proposed for pre-stack depth migration in non-zero offset domain,using precise synthetic shot gather,the correct migration sections with arbitrary velocity variations in all directions are obtained by this continuation operators.Based on migration result,seismic characteristic of dynamics can be studied.Comparison with other operators,numerical examples show that pre-stack depth migration with Double-square-root propagator is correct and effective,and easy to implement with a high computation efficiency and able to overcome numerical diffusion of the frequency efficiently.Application of this method is also important for lithologic reservoirs exploration.

关 键 词：波动方程 叠前深度偏移 数值模拟 非零偏移距 双平方根算子 

分 类 号：TE132[石油与天然气工程—油气勘探] P315.3[天文地球—地震学]