Abstract：A lot of sedimentary rocks have long and thin pores and fractures.According to Berryman scattering model method,using ellipsoidal pores to simulate the fractures of rocks and through changing the aspect of ellipsoidal pores,the shapes of fractures can be modeled.In combination with Gassmann equations and Walsh formulas,the studying the effects of aspect of pores on elastic property,P-and S-wave velocities and fluid-re-placement is conducted.The computational results showed that for the rocks having similar mineral components and porosity,the volumetric modulus of rock,elastic modulus of pores,P-and S-wave velocities and Poisson ratio have distinct difference because of difference of shape of fractures (aspect of ellipsoidal pores).Along with increasing the aspect of pores,the volumetric modulus and elastic modulus of pores approximately linearly increase,Poisson ratio decrease non-linearly,P-and S-wave velocity increase and influence of fluid on petrophysical property also decreases,vise verse.
