Abstract: Prediction of fluids in carbonate reservoirs is a major headache for the whole world. This paper puts forward the method applicable for predicting the fluids in the carbonate reservoir of Yijianfang Formation of Ordovician in Block A in western Tabei Uplift. This method is to predict by using the attribute of AVO fluid factors calculated from ΔvP/vP and ΔvS/vS, because the attribute response well to carbon-hydrogen. Through fluid displacement, prestack gather preprocessing, this paper obtains the attribute of AVO fluid factors using the binominal inversion method and prestack AVO inversion, and finally applies the attribute to fluid prediction, and the prediction agreement rate goes up to 85%. This lays a solid basis for the exploration of the oil and gas reservoir, and it could be good reference to carbonate exploration and development in similar blocks

Key words: fluid factor, fluid displacement, gather preprocessing, AVO inversion, carbonate, fluid prediction