Abstract: Compared with marine carbonate rocks, Yingxi lacustrine carbonate rock is characterized by mixed sediments, variable lithologies and diverse minerals. There are various types of reservoir spaces including intercrystalline pores and fractures as well as dissolved pores, leading to extremely high reservoir heterogeneity. It is hard to get accurate information about mineral content, porosity and pore structure only by using conventional logs, and effective reservoirs are difficult to be identified. In this paper, based on the data of FMI logging, lithoscanner logging, conventional logging and core analysis, the matrix porosity is accurately calculated by using variable skeleton method according to rock mineral components, the factors of matrix reservoir are constructed, and the integrated reservoir classification chart and classification standard for mixed lacustrine carbonate reservoirs are established by combining with test data, fracture parameters, FMI structure and apparent surface proportion of fractures and pores. The actual application result of the classification standard in Yingxi area is pretty good, providing references for logging evaluation of the complicated carbonate reservoirs in other areas