摘要
针对油气田开发中薄互层认识难的问题,提出从AVO分析解决困难,克服现有方法在反射系数公式中无厚度变量、时间域计算反射系数谱受采样率限制的不足,运用两个界面间位移与应力关系,从频率域地震波传播方程推导了任意入射角和薄层厚度下的反射系数谱.确定了薄层的几何特性、物理特性与地震响应间的关系,为研究薄层厚度、速度对薄层弹性波反射系数的影响提供了一定的理论基础.
AVO analysis is suggested for solving to solve the difficulty in identification of thin alternating layers in exploration of oilfields. It can improve the current method that has no thickness variable in the formula of reflective and is limited by sampling rates in calculation of the coefficient in the time of domain. Using the relationship of stress and displacement on two interfaces, this paper derives the spectrum of reflective coefficient for any incidence angle and thickness of thim layer based on the equation of seismic wave propagation in the frequency domain. It determines the relationship between geometry, physical progerties and seismic response. The result provides a theoretical basis for the study of effects of thin-layer thickness and velocity on the coefficient.
出处
《地球物理学进展》
CSCD
北大核心
2010年第1期71-75,共5页
Progress in Geophysics
关键词
AVO
反射系数谱理论
薄互层
AVO, reflection coefficient spectrum theory, Thin interbedded
