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在各向异性介质中 ,由于反射波的相速度不等于群速度 ,其反射波时距曲线不再是双曲线。应用双曲线时差分析方法不能求取准确的叠加速度 ,当然就不能进行精确的速度分析 ,因而得不到精确的正常时差。文中阐述了横向各向同性介质中长排列的非双曲线的P波时差速度分析方法 ,即对P波的旅行时间进行泰勒展开 ,应用t2 ～x2 的四次方展开项进行时差速度分析。理论模型的反演结果表明 ,P波旅行时、叠加速度及水平速度都达到很高精度 ,且可求取Thomsen参数 η。
In anisotropic media, the reflected wave time-distance curve is no longer hyperbolic since the phase velocity of the reflected wave is not equal to the group velocity. Using hyperbolic time-of-flight analysis can not find the exact stacking speed, of course, can not be accurate speed analysis, and therefore can not get accurate normal time difference. In this paper, we describe the non-hyperbola P-wave time-lag velocity analysis method of transversely isotropic media, which is to carry out the Taylor expansion on the traveling time of P-wave and the fourth-order expansion term t2 ~ x2. The inversion results of the theoretical model show that the superposition velocity and the horizontal velocity reach very high precision when the P wave travels, and the Thomsen parameter η can be obtained.