Abstract: Due to decreased formation energy of Y1 glutenite reservoirs in Shengli oilfield, the oilfield was under lowspeed and inefficient development status for a long time. To improve oil well productivity, the geological study on the reservoir was carried out. Through fine seismic interpretation, stratigraphic correlation and logging reservoir evaluation, the water injection effect of the 4~(th) member of Shahejie formation in Y1 glutenite reservoirs was analyzed, the main influencing factors of water injection effect were made clear, and the reasonable well spacing pattern, well spacing density, and the economic and technical well spacing were determined. The well fit technology formed by the combination of a multi-stage fracturing technology and radial drilling technology was put forward. The field implementation after the measures indicated the daily oil production, oil recovery rate and daily injection rate of the field evidently increased, while the water cut and injection pressure decreased, and the recovery was predicted to be increased by 6.9%.