基于Chapman频散介质的AVO属性提取方法研究

摘要

AVO技术主要探讨反射系数响应随炮检距的变化,确定AVO类型并求取截距、梯度及流体指示参数,从而预测储层的流体特征,但常规的AVO技术忽视了频率因素.基于Chapman多尺度裂隙介质理论,对频散介质AVO响应特征进行了分析,寻找出应用频率属性预测储层的证据,从Aki-Richards AVO近似公式出发,利用Taylor公式导出仅考虑纵横波速度随频率变化的频散AVO近似武,并验证了频散AVO近似式良好的计算精度,对常规AVO属性技术进行拓展并与地震波衰减技术结合,发展一种依赖频率的AVO属性分析技术,并在胜利油田的某工区进行应用,取得了良好的预测效果.%AVO technology mainly discusses the variation of the reflection coefficient response with the offset,determines the AVO type and obtains the intercept,gradient and fluid indication parameters to predict the fluid characteristics of the reservoir,but the conventional AVO technology ignores the frequency factor.Based on the Chapman multi-scale fissure media theory,the AVO response characteristics of the dispersion medium were analyzed to find out the evidence of the application of the frequency attribute prediction reservoir.From the Aki-Richards AVO approximation,Taylor formula was used to derive only the longitudinal and transverse wave velocity with the frequency variation of the dispersion AVO approximation,and verify the dispersion AVO approximation good calculation accuracy,the conventional AVO attribute technology was expanded and combined with the seismic wave attenuation technology to develop a frequency dependent AVO attribute analysis technology,which has been applied in a work area of Shengli Oil Field,and achieved good predictive effect.