Comparison Study of two Converted Wave Prestack Time Migration Methods

摘要：

　　EOM(Equivalent Offset Migration)and POM(Pseudo Offset Migration)are two important methods with different mapping modes in converted wave prestack time imaging.EOM puts the pseudo shot and the pseudo receiver at the same point to make the EOM gathers to be hyperbolic.Different from EOM,the ray path of POM meets the Snell”s Law,so the true common reflection point gathers can be extracted.In this paper,pseudo offset formula was deduced separately under two different extreme conditions.And converted wave imaging tests for complex models were carried out with these two methods.The advantages of these two prestack time migration methods were also analyzed and compared.The result shows that the time-distance curve”s hyperbolic characteristics of CCSP gathers formed by POM are precisely with lower noise.The common conversion scatter point gathers from POM have a higher velocity analysis accuracy.So POM method can get a better imaging result.

关键词： Converted wave equivalent offset pseudo offset common conversion scatter point gather prestack migration imaging

作者: Yani Wang Qingchun Li Guangzhou Shao Jiajia Cao

作者单位: School of Biological and Environmental Engineering,Xi”an University,Xi”an,PRC School of Geological Engineering and Geomatics,Chang”an University,Xi”an,PRC Rockstar Petroleum Science Technology Limited Company,Beijing,PRC

会议类型: 国内会议

会议名称: 2017年第五届数字油田国际学术会议(DOFIAC2017)

会议地点: 青岛

会议语种:英文

页码: 368-372

在线出版日期: 2017-10-15（万方平台首次上网日期，不代表论文的发表时间）