横向变速小尺度体反射系数变化规律研究

Reflectivity Coefficient in Laterally Variable Velocity and Small-scale Area

AVO技术的研究已有30多年的发展历程,其中有起有落。近年来AVO技术的应用日趋广泛,发展较快。在寻找非均质油气藏方面,AVO技术具有其他方法不可替代的作用。通过对横向小尺度体的模型设计,正演模拟的计算及与Zoeppriz方程计算理论值的对比,讨论了横向小尺度体大小变化、速度变化对反射系数的影响,得出了横向尺度大小及速度变化对反射系数的影响规律,总结了横向变速时反射系数随偏移距的变化规律。

In past 30 years,the development of amplitude versus offset （AVO） research went up and down. In recent years,the AVO application has been extensively accepted and used rapidly. In the exploration of the heterogeneous reservoir,the AVO is an irreplaceable method,in comparison with others. In this paper, we discuss the influence of lateral small-scale size and velocity variation on the reflectivity coefficient by means of transverse small-scale design, forward simulation calculation, and comparison of theoretical values of Zoeppritz equation. The reflectivity variation depends on the lateral scale size and velocity. We find a rule of reflectivity coefficient with offset distance in the lateral velocity.