Clastic reservoir architecture, which was applied to fluvial facies reservoir characterization by Miall in 1985, refers to geometric shape, scale, orientation and superposed relationship of reservoir units of different orders. Clastic reservoir architecture is an intuitive quantitative measure of reservoir heterogeneity characterization, influencing the effect of reservoir development directly. Thus, how to undertake fine architecture characterization is the key to whether reasonable quantitative development indexes or proper description of remaining oil distribution can be described so as to effectively reduce the ratio of low-efficiency wells. With an aim of overcoming the natural restriction that the thickness of fluvial facies deposition reservoirs of the Minghuazhen Formaion in Bohai bay is less than minimum requirement of seismic resolution, this study carried out the classification for the various reservoir architectures constrained by seismic data in a distinguishable scale for seismic data. A classification of three architectures and seven types has been established. Based on seismic response characteristics of each architecture and description of relevant seismic attributes, “seismic architecture facies”, which combines architecture types with their seismic responses, constitutes a characterization method of “seismic architecture facies” based high-resolution conceptual model. Our study shows that although various reservoir architectures cannot be well gridding on the basis of present geological and numerical modeling technologies, the equivalent conceptual model may be an applicable technological approach.