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根据地震波在具有垂直对称轴的横向各向同性 (VTI)介质中的运动学特征 ,应用传播时间反演方法 ,进行了水平层状VTI介质的地层弹性参数反演方法研究。在VTI介质中 ,P P波的传播时间曲线不再是双曲线 ,尤其在长排列情况下 ,已不能用二项泰勒展式精确地反演P P波的传播时间 ,用三项泰勒展式则可以达到更高精度 ;P SV波的传播时间也可用三项泰勒展式表达 ,在中等及短排列长度时可达到一定精度。对P P波、P SV波的传播时间进行三项泰勒展开时 ,它们的系数中包含了地震波的各向异性信息及垂直速度信息 ,可以为地震波的弹性参数反演提供基础。模型试验分析及江苏油田某地区的二维多波资料实际反演结果表明 ,在最大炮间距为 1.5倍地层埋深时 ,可以很精确地得到三项泰勒展式的系数 ,应用这些系数能精确反演地层弹性参数 ,包括P波、S波的垂直速度和各向异性参数。图 4表 1参 5 (杜丽英摘 )
According to the kinematic characteristics of seismic waves in a transversely isotropic (VTI) media with vertical symmetry axis, the inversion of formation elastic parameters of horizontal layered VTI media is studied by propagation time inversion method. In VTI medium, the PP wave propagation time curve is no longer a hyperbola, especially in the case of long array, the Taylor equation can not be accurately used to reverse the PP wave propagation time, three Taylor expansion can be To achieve higher accuracy; P SV wave propagation time can also be used three Taylor-style expression, in the medium and short array length can reach a certain accuracy. For three Taylor expansion of propagation time of P P wave and P SV wave, their coefficients include the information of seismic wave anisotropy and the vertical velocity information, which can provide the basis for the elastic parameter inversion of seismic wave. The results of model tests and practical inversion of two-dimensional multi-wave data in a certain area of Jiangsu Oilfield show that when the maximum gun spacing is 1.5 times the depth of the formation, three Taylor expansion coefficients can be obtained with high accuracy. The coefficients can be used precisely Inversion of formation elastic parameters, including P wave, S wave vertical velocity and anisotropic parameters. Figure 4 Table 1 参 参 5 (杜丽英 摘要)