论文部分内容阅读
通过融合各向异性微分等效介质理论(DEM)和Brown-Korringa各向异性流体替换模型,本文提出根据纵波速度反演岩石等效孔隙纵横比进行页岩气储层横波速度预测的方法.首先,利用各向异性DEM和Brown-Korringa模型建立岩石的纵横波速度与密度、孔隙度、饱和度和矿物组分等各参数之间的关系;其次,将岩石孔隙等效为具有单一孔隙纵横比的理想椭球孔,应用二分法来寻找最佳的等效孔隙纵横比使得理论预测与实际测量的纵波速度之间的误差最小;最后,将反演得到的等效孔隙纵横比代入到各向异性DEM和BrownKorringa模型中构建横波速度.实验室数据应用表明,由纵波构建的横波速度与实测横波速度吻合良好,说明本文提出的有机页岩横波速度预测方法是有效的.
By combining the anisotropic differential medium theory (DEM) and the Brown-Korringa anisotropic fluid replacement model, this paper presents a method to predict the shear wave velocity of shale gas reservoirs based on the P- , Using the anisotropic DEM and Brown-Korringa models to establish the relationship between the P-wave velocity and the parameters such as density, porosity, saturation and mineral composition of rock; secondly, the rock porosity is equivalent to a single pore aspect ratio Of the ideal ellipsoid hole, the application of dichotomy to find the best equivalent aspect ratio so that the theoretical prediction and the actual measurement of the longitudinal wave velocity error between the minimum; Finally, the inverse of the equivalent pore aspect ratio into the all The shear wave velocity is constructed in the opposite-sex DEM and BrownKorringa models.Experimental data show that the shear wave velocity constructed by P-wave coincides well with the measured S-wave velocity, which shows that the shear-wave velocity prediction method proposed in this paper is effective.