Abstract: Reservoir configuration study is the core of fine reservoir description and then fine characterization of reservoir heterogeneity can be realized. Based on the study of sand body configuration in fluvial reservoirs, numerical well test models are built for percolation resistance areas resulted from the superimposition of different sedimentary sand bodies of fluvial facies and the corresponding well test response charts are established. Based on which the reservoir connectivities of various sediments are determined. Through the well test analysis on sand body superimposition modes, the response characteristics of sand bodies are determined for different thickness and different positions. A case study in a certain oilfield of Bohai Bay has verified the geological configuration results by combining the studies of seismic, logging and sedimentation, which can provide basis for geological pattern study and well allocation in fluvial reservoirs