Abstract
Compensation for geometrical spreading along the ray-path is important in AVO (amplitude versus offset) analysis since it contributes to the seismic amplitude preservation. The P-wave geometrical spreading factor is expressed by the reflection traveltime described by a nonhyperbolic moveout approximation using the traveltime parameters that can be estimated in velocity analysis. We develop a 3D GMA type approximation for the relative geometrical spreading in a homogeneous orthorhombic (ORT) medium. Two type of GMA form approximations are defined by different selection of reference rays. In the numerical examples, we compare our proposed GMA form approximations with other type of approximations in a homogeneous ORT model and show that our GMA type approximations are superior among all approximations.
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