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Amplitude-preserved pre-stack time migration in 3D VTI media
Jiangjie
Zhang 1 2
Jianfeng
Zhang 1
1
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
2
Corresponding author. Email: zhangjj@mail.iggcas.ac.cn
Exploration Geophysics
43(3)
171-177 http://dx.doi.org/10.1071/EG11037
Submitted: 12 July 2011 Accepted: 24 April 2012 Published:
7
June
2012
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Abstract
We present a new method of amplitude-preserved pre-stack time migration in 3D vertical transversely isotropic (VTI) media. The travel time and amplitude of a wave propagating in VTI media are calculated by using one-way wave operators and the stationary-phase theory. An imaging weight from the deconvolution imaging condition is introduced to produce amplitude-preserved image gathers for hydrocarbon and fluid detection. Velocities and stacking anisotropic parameters are estimated by a semblance scanning method. A time-dependent migration aperture corresponding to the dip of subsurface structure is then obtained to balance imaging quality and imaging noises. Numerical examples demonstrate that our method is accurate, robust and easy to implement.
Key words:
amplitude-preserved, pre-stack time migration, time-dependent migration aperture, VTI media.
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