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![]() | Wave-equation tomography for anisotropic parameters | ![]() |
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Anisotropic models are recognized as more realistic representations
of the subsurface where complex geological environment exists. These
models are widely needed by many anisotropic migration and interpretation
schemes. However, anisotropic model building is still a challenging
problem in the industry. In this paper, we propose an approach to
build the anisotropic model using Wave-Equation Tomography
(WETom) on surface seismic data in the image space. To reduce the null space of the
inversion, we parametrize our model space using only vertical velocity
(
) and the anellipticity parameter
. Numerical tests show
that anisotropic WETom is effective in resolving model perturbations;
however, ambiguity exists between the vertical velocity and the
anellipticity parameter. Auxiliary information is needed to further
constrain the inversion.