Abstract:Based on the theoretical analysis of logdatabased petrophysical simulation and according to the data of two wells in eastern oilfield of China (such as log data,lithologic and test data),the paper used such a flow as correction of logging environment→selection of petrophysical model→computation of elastic parameters and selected differential equivalent medium and adaptive petrophysical model to simulate and predict the velocities of Pand Swaves in two wells. Using the relationship between the velocities of P and Swaves,density parameters and elastic modulus to deduce the PtoSwaves velocity ratio,shear module,Lame constants and Poisson’s ratio parameter,and again get the rule that the variation of the lithology,porosity and fluid affects the elastic parameters according to the crossplot and correlation analysis,which yields bases of identifying reservoir in research area.