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It is known that rock anisotropy can significantly influence the phase and energy velocities of an elastic wave,as well as its reflection/transmission(R/T)coefficients.As a result,it can distort the velocity analysis of seismic-reflection data.In this work we present a velocity analysis for seismic-reflection data based on the available anisotropic rock parameters.We analyzed the created errors on time-depth relation of the seismic-reflection data in neglecting rock anisotropy and/or neglecting the difference between energy velocity and phase velocity,including the case of wide-angle reflection.The calculated results show that the effect of rock anisotropy on time-depth relation of seismic-reflection data is dependent not only on the values of anisotropic parameters,but also on the space arrangement of both source and receiver-array.For all studied cases(weak,moderate or strong anisotropy),we found that the effect of rock anisotropy on time-depth relation could not be neglected.Nevertheless,for the case of weak anisotropy,the energy velocity may be replaceable by the phase velocity to obtain a very good approximation on time-depth relation.Consequently,the seismic-reflection data processing algorithm for numerical computations can be simplified.
It is known that rock anisotropy can significantly influence the phase and energy velocities of an elastic wave, as well as its reflection / transmission (R / T) coefficients. As a result, it can distort the velocity analysis of seismic-reflection data. this work we present a velocity analysis for seismic-reflection data based on the available anisotropic rock parameters. We’ve analyzed the created errors on time-depth relation of the seismic-reflection data in neglecting rock anisotropy and / or neglecting the difference between energy velocity and phase velocity, including the case of wide-angle reflection. The calculated results show that the effect of rock anisotropy on time-depth relation of seismic-reflection data is dependent not only on the values of anisotropic parameters, but also on the space arrangement of both source and receiver-array.For all studied cases (weak, moderate or strong anisotropy), we found that the effect of rock anisotropy on time-depth relation could not be neglected. Neverth eless, for the case of weak anisotropy, the energy velocity may be replaceable by the phase velocity to obtain a very good approximation on time-depth relation. Reconstructed, the seismic-reflection data processing algorithm for numerical computations can be simplified.