Abstract：In the YTB area of the central Sichuan Basin, oil and gas frequently show in the tight channel of the second member of Shaximiao Formation, where multiple overlapping riverbeds are developed, and the sand body features lateral heterogeneity of reservoirs caused by sedimentary microfacies change. As the accurate characterization of the sedimentary microfacies faces great difficulties, it is difficult to accurately predict the vertical and horizontal distributions of natural gas, as well as its productivity. Therefore, according to the characteristics of seismic response, the waveform clustering and root-mean-square amplitude attributes are selected to predict sedimentary facies zones given the logging data and core data. The recognition accuracy of sedimentary microfacies is improved by multi-attribute fusion. The results of seismic facies analysis show that:①the second member of Jurassic Shaximiao Formation in the YTB area is a set of meandering river deposits, where three sub-facies are mainly developed, i.e., riverbed, bank, and flood plain. Among them, the riverbed mainly develop microfacies of marginal banks and channel, and the bank can be divided into microfacies of crevasse splay and natural levee.②The reservoir physical property of the marginal bank is the best, followed by the natural levee.The research results of sedimentary microfacies in Shaximiao Formation can effectively guide and support the exploration and development of tight channel sandstone gas reservoirs, and the proposed multi-attribute fusion technique can provide a reference for the fine characterization of the sedimentary microfacies of Shaximiao Formation in other areas of the Sichuan Basin.
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