基于EI-Fatti弹性波阻抗反演的流体识别

通过EI-Fatti弹性波阻抗反演直接得到了纵波阻抗、横波阻抗和密度数据,并以三类AVO模型进行反射系数试算,满足了流体识别对反演精度较高的要求。同时,采用基于EI-Fatti弹性波阻抗的两个流体识别因子对三类AVO模型进行对比分析,表明两种流体识别因子对于不同类型的AVO模型的流体识别效果是不同的。在实际资料中,利用弹性波阻抗反演产生较多弹性参数的优势,将这些弹性参数与储层参数进行交会和相关分析,分别定性和定量地对储层进行流体识别,从而达到了有效区分高饱含气和低饱含气储层的目的。

FLUID IDENTIFICATION BASED ON EI-FATTI ELASTIC IMPEDANCE INVERSION

EI-Fatti elastic impedance inversion can directly yield P-wave impedance,S-wave impedance and density data.The tentative calculation of reflection coefficients of three AVO models shows that the inversion method meets the requirements of inversion precision.Meanwhile,based on EI-Fatti elastic impedance of two fluid factors,the three AVO models were comparatively studied,and the results show that the two fluid factors show different fluid identification effects for different AVO models.Meanwhile,through the intersection and correlation analysis of elastic parameters and reservoir parameters,qualitative and quantitative fluid identification can be carried out,so the gas reservoir can be distinguished from the fizz reservoir in actual data.