White, J. C. and Hobbs, R. W. (2007) 'Extension of forward modeling phase-screen code to for AVO analysis in isotropic and anisotropic media.', Geophysics., 72 (5). SM107-SM114.
The computationally efficient phase-screen forward modeling technique is extended to allow investigation of non-normal ray paths. The code is developed to accommodate all diffracted and converted phases up to critical angle, building on a geometrical construction method. The new approach relies upon pre-scanning the model space to assess the complexity of each screen. The propagating wavefields are then divided as a function of horizontal wavenumber, and each subset is transformed to the spatial domain separately, carrying with it angular information. This allows both accurate 3-D phase corrections and Zoeppritz reflection and transmission coefficients to be applied. The phase-screen code is further developed to handle simple anisotropic media. During phasescreen modeling, propagation is undertaken in the wavenumber domain where exact expressions for anisotropic phase velocities are available. Travel-times and amplitude effects from a range of anisotropic shales are computed and compared with previous literature.
|Additional Information:||Published by the Society of Exploration Geophysicists.|
|Keywords:||Seismic modelling, Anisotropy.|
|Full text:||PDF - Published Version (475Kb)|
|Publisher Web site:||http://segdl.aip.org/dbt/dbt.jsp?KEY=GPYSA7&Volume=72&Issue=5|
|Record Created:||24 Jul 2007|
|Last Modified:||09 Jun 2010 11:43|
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