地震数据广义合成的频率空间域逆时偏移  

Reverse-time migration based on generalized synthesis of seismic data in frequency-space domain

作　　者：陈国新[1] 陈生昌[1] 任浩然[1] 王汉闯[1] 周华敏[1] 

机构地区：[1]浙江大学地球科学系,浙江杭州330027

出　　处：《浙江大学学报（工学版）》2015年第2期384-392,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(41374001); 国家青年自然基金资助项目(41304089); 新苗人才计划资助项目(2014R401211)

摘　　要：为了降低偏移成像方法的计算成本,利用地震数据的广义合成技术,将共炮道集数据及其震源转化为合成道集与合成震源.结果表明,通过将频率空间域的地震数据广义合成技术与频率空间域的逆时偏移成像方法相结合,可以使频率空间域逆时偏移的计算效率提高1.5~3倍,而且可以得到与常规共炮道集频率空间域逆时偏移基本相同的成像结果.相比于随机合成数据逆时偏移,平面波数据逆时偏移不含随机交叉噪音,可以得到更好的成像结果.In order to reduce the computational cost of migration imaging method, we transformed common shot gathers data and its source into synthetic gathers and synthetic source by using generalized seismic data synthesis theory. The results show that given the advantage of frequency-space domain in numerical calculation relative to the time-space domain, reverse-time migration based on generalized seismic data synthesis in the frequency space domain can greatly improve the computational efficiency, computational efficiency can be improved 1. 5 to 3 times, and the imaging results are equivalent to the conventional reverse-time migration in frequency-space domain. Numerical experiment results also show that the imaging results of plane wave gathers reverse-time migration don^t have random cross-talk, are better than random synthetic data reverse-time migration.

关 键 词：地震数据 线性叠加 广义合成 频率空间域 逆时偏移 

分 类 号：P631[天文地球—地质矿产勘探]