层状介质P波非双曲走时速度误差分析

为提高各向异性非双曲速度分析的精度, 以适应大偏移距和复杂介质条件下的速度分析, 通过总结层状介质非双曲线速度参数估计的基本步骤, 同时利用数值模拟及相似度分析方法验证了非双曲线速度分析的可靠性, 反演出的速度结果与理论值的误差为1% ±。同时, 对各向异性参数η进行了误差分析, 发现η对误差相当敏感, 直接反演所得的η值与理论计算值误差高达12.87% , 因此最好进行直接拾取, 以提高速度分析的精度。

Error analysis of P-wave non-hyperbolic moveout velocity in layered media

In order to improve the precision of non-hyperbolic anisotropic velocity analysis and adapt the velocity analysis to far offset or other complex circumstances, the authors confirm the reliability of non-hyperbolic velocity analysis by summarizing the basic steps of velocity parameters estimation of non-hyperbola in layered media and using numerical simulation and resemblable analysis, and the error between inversion result and theoretical value is about 1%. The error analysis of anisotropic parameterη indicates it is sensitive to the error, and the error between inversion result and theoretical value is as high as 12.87% , so it is best to pick η directly to increase the precision of velocity analysis.