Abstract：There has been long period of time that studying the absorptivity of reservoir was generally to uses Fourier transform that decomposes the signal into harmonic wave and computes the relative average absorptivity of targets by linear form，which constrained the predicting accuracy of reservoir and popularization of the method. The paper used PRONY filtering method that decomposes the signal by damping filtering,implements non-linear filtering and directly computes the absorbing coeffident. The method has good decomposing ability for a single wave, can provide three kinds of shows such as amplitude spectrum，energy curves and PRONY filtered sections，having a strong QC tools. In Zizhou-Jiaxiang area of Ghangqing gasfield,using the method to predict the Upper Paleozoic reservoirs made good results,the knowledge of relation between absorbing coefficient and gas production is as follows:if it's high gas producing rate，more high-frequency components are absent on section that characterized by weaker energy,evident absorbing zone and being weaker and blind reflection;on the contrary,if it's lower gas producing rate,less high-frequency components are absent on the section that characterized by stronger energy,fuzzy absorbing zone and being middle-strong re-flection.
