各向异性介质纵波速度分析

P-wave velocity analysis in anisotropy medium

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（Institute of Geophysical Prospecting; SINOPEC Exploration & Production Research Institute; Nanjing 210014; China）

速度分析是数据处理和解释中的重要环节，根据各向同性假设的传统速度谱技术已经得到广泛应用，但对于实际资料中存在的各向异性，则需要用各向异性的速度分析方法为各向异性的成像处理提供参数。采用垂直各向同性（VTI）介质的纵波各向异性参数和动校速度分析的方法，分别对理论记录和实际资料进行双参数速度谱扫描方法试验。针对信噪比较低的实际数据，采用先形成超道集，然后再做信号互相关速度谱分析的处理方法。经过理论数据和实际资料的计算，证明该方法可以从纵波的旅行时中同时提取出纵波各向异性参数和动校速度，还可以利用该方法产生沿界面的纵波各向异性参数的曲线图或切片图。

Velocity analysis is a key step in data processing and interpretation Though traditional velocity analysis that is based on isotropy assumption has been widely used, anisotropic velocity analysis is required to tackle the anisotropy of real data and to provide velocity for anisotropic imaging Dual parameter velocity scan was implemented on synthetic and real data for P-waves in VTI media For real data of relatively low resolution, super gathers were firstly generated, and then crosscorrelation velocity spectrum analysis was carried out for signals This method can extract P-wave anisotropic parameters and NMO velocity from P-wave traveltimes, as well as generate curves or slices of P-wave anisotropic parameters along reflecting interface