The tight sandstone reservoir is the main gas-producing layer in the Yanchang gas field. In order to make clear the reservoir characteristics, the reservoir of the He 8 member in the Jingbian area is analyzed by comprehensively using logging and analysis test data. The results show that the porosity of the reservoir ranges mainly between 3% and 12%, and the permeability is 0.52 × 10–3 μm2, which belongs to the tight gas reservoir. The reservoir's physical properties are controlled by sedimentation and diagenesis. The distributary channel is a favorable sedimentary facies belt, and its lithology is mainly medium-coarse lithic sandstone, and the reservoir space is mainly lithic dissolved pores and intergranular pores. Cementation and mechanical compaction in the form of cementation of clay minerals, silica, carbonate, and chlorite are the main factors leading to reservoir compactness, and the dissolution of intergranular fillers is beneficial for secondary pores.