横向各向同性介质中的反射波时距曲线

常规的反射数据处理都假定介质为各向同性。现已发现，各向异性会影响处理和解释的效果，如速度分析、时深转换、偏移等。因此，对于许多处理和解释，了解反射波时距曲线极为重要。本文研究了横向各向同性介质中的走时曲线计算，给出了精确的时距曲线方程，推导了相应的走时近似公式，它可用于小炮检距的走时计算。在大炮检距情况下，对于准Ｐ波，可用一解析校正计算；对于准ＳＶ波，则可用多项式拟合法来处理。数值计算所得的走时曲

Reflection time-distance curves in transversely isotropic media

The conventional reflection data processing is based on the assumption that the mediuin isisotropic. The anisotropy may affect the result of processing and interpretation such as velocityanalysis,time-to-depth conversion,migration and so on. So it is very important to understand thereflection time-distance curves. The paper deals with the traveltime curve calculation in transverse-ly isotropic media,gives the exact reflection time-distance curve equation. The corresponding traveltime approximation formula has been derived,which can be used in the traveltime calculation forsmall offset. In the case of large offset,for the quasi-P-wave an analytic formula can be used forthe calculation,and for the quasi-SV-wave a polynomial fitting method can be used for the process-ing. The traveltime curves obtained by numerical calculation show the effectiveness of the method.The formula in the paper can be applied to the fast calculation of the traveltime in transverselyisotropic media,and is also useful in the elastic parameter inversion and migration.