Abstract:Because of deep embedding,weak seismic reflection,strong heterogeneity of carbonate reservoir,very little progress in exploration of marine nature gas in South China have been made lately.Therefore,effective methods to predict carbonate reservoir are keys of oil and gas exploration in this area.Based on theory of sedimentology and sequence stratigraphy on marine carbonate,in this paper we divide sequence stratigraphy of Feixianguan formation in Tongnanba structural belt in Sichuan Basin and establish its regional isochronous stratigraphic framework using with fieldwork data,drilling,logging and seismic data.Then we calibrate delicately reservoirs,obtain geophysical response characteristics of oolitic beach reservoir in isochronous stratigraphic framework.Based on high-resolution 3D seismic imaging,seismic attributes analysis of sequence stratigraphic framework and virtual reality,we predict oolitic beach reservoir distribution of Feixianguan formation in Tongnanba structural belt.Results show that the reservoirs of Feixianguan formation developed in Hebachang and Malubei in plane,thickness of reservoir in Hebachang is greater than in Malubei.