倾斜界面各向异性介质方位AVO响应特征分析及应用

Azimuth AVO Analysis for Dip Interface of Anisotropic Medium and Its Application

为认识和研究倾斜界面各向异性介质方位AVO(振幅随偏移距的变化)的响应特性,在Rüger描述HTI(水平横向各向同性)介质纵波反射系数(Rpp)近似表达式的基础上,结合倾斜界面入射角与其对应水平界面入射角、方位角、倾角相互关系给出了倾斜界面HTI介质纵波反射系数的表达公式。同时对上覆均匀各向同性介质、下伏HTI介质进行模型正演模拟,并与推导公式计算结果进行对比,验证了该公式的正确性,并用该方法对渤海某油田进行了AVO分析,取得了较为理想的效果。

For a better understanding and research of response characteristics of azimuth-AVO in anisotropic medium from a tilted interface,a workflow was developed for azimuth AVO analysis for dipping reflector of two media,one of them was weakly HTI medium.The technique was based on the concept of Rüger proposed for HTI medium,in combination with the relationship among the incident angle of dipping interface,dip angle,azimuth angle and incident angle of responding flat layer.The simulation results are compared with the calculation result,it is demonstrated that the formula is correct,it is used for AVO analysis in an oilfield of Bohai Area,a better effect is obtained.