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在ＶＴＩ介质中,用非双曲线可以很好地近似Ｐ—Ｐ波中长排列情况下的旅行时;而对于Ｐ－ＳＶ波来说,应用非双曲线却不能很好地近似Ｐ－ＳＶ波的旅行时。对Ｐ－Ｐ波、Ｐ－ＳＶ波的旅行时进行三项泰勒展开时,它们的系数却包含了地震波的各向异性信息及其垂直速度信息,这为地震波的弹性参数反演提供了基础。实验分析表明,在中等排列长度下可以精确地得到Ｐ—Ｐ波、Ｐ—ＳＶ波旅行时的三项泰勒展式系数,从而可以精确地进行地层弹性参数反演。
In VTI medium, using non-hyperbola can well approximate the travel time of P-P wave in long-length arrangement. For P-SV wave, non-hyperbola can not approximate P-SV wave well When traveling. When three Taylor expansion of P-P waves and P-SV waves are carried out, their coefficients include seismic anisotropy information and vertical velocity information, which provides a basis for seismic elastic parameter inversion. Experimental results show that the Taylor series expansion coefficients of P-P wave and P-SV wave can be accurately obtained with medium arrangement length, so that the inversion of formation elastic parameters can be accurately carried out.