%0 Journal Article
%T Kirchhoff prestack time migration of PS-wave data for the layered anisotropic medium<br>层状各向异性介质转换波克希霍夫叠前时间偏移
%A HUANG Zhong-Yu
%A QU Shou-Li
%A WANG Yu-Jing
%A ZHAO Gai-Shan
%A WEI Xiu-Cheng
%A XU Yi-Ming
%A YU Bo
%A <br>黄中玉
%J 地球物理学报
%D 2009
%I 
%X The method of calculating travel times of seismic wave in Kirchhoff pre-stack time migration (PSTM) plays an important role of determining the quality of imaging for large offsets. The travel times are computed by the non-hyperbolic equation based on single layer anisotropic medium in the conventional 3D PS-wave anisotropic PSTM equations so that the events are over-migrated in common imaging point gathers (CIP) when the offset/depth ratio is greater than a threshold value. The uneven events have negative effects on migrated stack response, decrease frequency and lead to contaminating the quality of imaging. We proposed a new method to calculate travel times based on the layered anisotropic medium in PS-wave PSTM technology utilizing the migrated velocity model which was generated in the conventional 3D PS-wave anisotropic PSTM. The new method can improve the precision of travel times for the large offsets and overcome the over-migration events for a large offset/depth ratio in CIP gathers. The realistic 3D PS-wave data from two areas of West China demonstrated that the continuity and resolution of imaging section had obviously been improved by using the new PSTM comparing to conventional PS-wave PSTM and enhanced the interpretation of structures on imaging section.
%K Converted-wave
%K Layered anisotropic medium
%K PSTM<br>转换波
%K 层状各向异性介质
%K 叠前时间偏移
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=D3C7C3F9B51FA6D88BBDD1A2B5E4BFF2&yid=DE12191FBD62783C&vid=286FB2D22CF8D013&iid=59906B3B2830C2C5&sid=5FBFFEC445B17185&eid=5AF11FA0D8B930A2&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=2&reference_num=9