A modified EOM method for PS-wave migration
Yun Wang 1 Wei Wang 2 4 Junjie Yin 31 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
2 The State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
3 National Engineering Research Center of Coal Bed Methane Ltd., Beijing 100011, China.
4 Corresponding author. Email: wangweiitpcas@163.com
Exploration Geophysics 43(3) 156-161 https://doi.org/10.1071/EG11019
Submitted: 25 April 2011 Accepted: 3 April 2012 Published: 16 May 2012
Abstract
A modified EOM method is developed for PS-wave migration based on the equivalent offset migration (EOM) for P-waves. This gives better imaging quality than the previous EOM methods by reducing errors from the discretisation of equivalent offsets and suppressing noise from the co-location of source-receiver. An equivalent PS-wave velocity is also introduced. Processing real 2-dimensional 3-component seismic data shows that the method can produce a better migrated image than the conventional common conversion point (CCP) method.
Key words: co-location, common conversion point, discretisation, equivalent offset, PS-wave.
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