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准确的横波测井速度是叠前地震反演和叠前地震属性分析的必要参数,然而实际生产中往往缺乏横波速度信息。文章针对川西Q地区须家河组中低孔隙度的特点,利用实测纵横波数据拟合、Greenberg-Castagna、临界孔隙度、Krief、Xu-White等方法对横波速度进行了预测。经过综合分析,在川西Q地区,通过实测纵横波数据拟合建立的模型和Greenberg-Castagna横波预测模型效果较好。为之后的叠前地震反演和叠前地震属性分析奠定了基础。
Accurate shear-wave velocity is a necessary parameter for pre-stack seismic inversion and prestack seismic attribute analysis, however, shear wave velocity information is often lacking in actual production. According to the characteristics of low porosity of Xujiahe formation in Q area, western Sichuan, the paper makes a prediction on the shear wave velocity by using the data of observed S - wave data, Greenberg - Castagna, critical porosity, Krief, Xu - White and so on. After a comprehensive analysis, the model established by the measured S-wave data fitting and the Greenberg-Castagna S-wave prediction model are better in the Q area of western Sichuan. This laid the foundation for the subsequent prestack seismic inversion and prestack seismic attribute analysis.