【摘要】 传统AVO理论只考虑单界面两侧地层的岩石物理特征,没有考虑地层厚度、地震波衰减及速度频散问题。采用考虑了层厚及地震波主频影响的层状介质Brekhovski方程进行岩石物理正演,并将其作为AVO分析的理论指导;利用小波分频技术与AVO分析相结合,分析不同频带范围内目的层地震反射振幅的AVO梯度变化,以解决薄互层储层的AVO识别预测问题。通过在罗家地区的应用研究,总结出了叠前分频AVO分析方法的实用流程,有效预测了沙河街组一段生物灰岩薄互层储层的分布范围。更多还原

【Abstract】 The traditional AVO theory only considers the petrophysical characteristics of strata on both sides of the single interface,without considering the layer thickness,seismic wave attenuation and velocity dispersion.Here,we utilize layered media Brekhovski equation for rock physical forward modeling which takes layer thickness and the impact of seismic wave domain-frequency into account,and regards it as the theoretical guide for AVO analysis.By combining wavelet frequenct-division technique with AVO analysis,we study the AVO gradient variation of reflection amplitude of seismic wave in different frequency band to solve the AVO identification and prediction problem for thin-interbedded reservoir.By the application in Luojia Area,we conclude a practical workflow of prestack frequency-division AVO analysis.Through adopting the workflow,the distribution of thin-interbedded Es1 Biolithite reservoir is effectively predicted.更多还原