Reservoir fluid identification based on exact Zoeppritz equation
Fluid identification is critical for reservoir prediction.However,in isotropic media,the Russell fluid factor is mainly obtained through the inversion of the approximate formula based on the Zoeppritz equation or the indirect calculation of elastic parameters.However,the inversion based on the approximate formula is prone to disturbance by assumptions such as a small angle of incidence and a low contrast,which affects the in-version accuracy.Therefore,this paper proposes the reservoir fluid identification method based on the exact Zo-eppritz equation.Firstly,the exact Zoeppritz equation is rewritten to include the Russell fluid factor,Poisson's ratio,and density.Then,the objective function for the simultaneous inversion of the fluid factor,Poisson's ra-tio,and density is constructed under the Bayesian inversion framework.The iteratively reweighted least square(IRLS)method is used to solve the inversion objective function nonlinearly.The test results of synthetic data and actual work area data show that the proposed method can effectively identify fluids,which indicates that this method can provide new research ideas on reservoir fluid prediction and reservoir fluid calibration.
万方数据
维普
