Abstract: Based on the fact that the principal factor controlling the recoverable reserves in fractured reservoirs is fracture and the close relationship between fracture development and structural curvature,a method of estimating reserves with the application of seismic profiles is proposed. Physical and geological bases of the method are discussed and steps of calculation are described,together with the computation and analysis of some theoretical model profiles for illustration.A gas field of fractured carbonate reservoir in Sichuan is taken as an example for estimation of reserves.