双相介质的AVA属性分析

Analysis on the AVA attributes of the two-phase media

从Biot双相介质理论出发,对双相介质的AVA方程与单相介质的Zoeppritz方程进行比较与分析后认为,双相介质与单相介质的差异主要体现在Biot模型中固相、液相耦合作用方面。总结了AVA方程的变化规律。应用实例反映储层上界面与储层下界面的反射、透射系数曲线特征,获得了慢纵波在地震勘探中衰减较快的理论依据。

It is considered that the differences between the two-phase media and one-phase media are reflected from the coupling effect of the solid phase and liquid phase after the AVA equations of the two-phase media are compared with the Zoeppritz equations of the one-phase media based on the theory of the Biot two-phase media. The change rules of the AVA equation are summarized. The characteristics of the curve of the reflection and transmission coefficient from the upper and lower interfaces of the reservoir are presented in the example, the theoretical basis for that the slow P wave with fast attenuation is obtained.