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![]() | 3D generalized nonhyperboloidal moveout approximation | ![]() |
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onelayernmo,onelayeral,onelayerxu,onelayergma
Figure 2. Error plots in the homogeneous orthorhombic layer (Layer 1) of a) NMO ellipse b) approximation by Al-Dajani et al. (1998) c) approximation by Xu et al. (2005), and d) the proposed approximation. Note that b), c), and d) are plotted under the same color scale and ![]() |
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For a more complex anisotropic medium, we consider a single horizontal layer of an orthorhombic material (Layer 1) with properties given in Table 1 with 1
thickness over flat reflector. The accuracy comparison between different approximations is shown in Figure 2. The reference rays for the generalized approximation (equation 1) were shot at
and and
along
-axis, at and
and
along
-axis, at
and
along
, and at
and
along
. Note that the approximation by Xu et al. (2005) is a simplified version of that by Al-Dajani et al. (1998) and therefore, produces almost identical results with only a small difference (Figures 2b and 2c). The proposed approximation shows an error, which is several orders of magnitude smaller than that of previous approximations (Figure 2d).
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![]() | 3D generalized nonhyperboloidal moveout approximation | ![]() |
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