Abstract: Based on the geologic feature and the development performance data of Lower W uerhe reservoir in District No.8 of Karamay oilfield, its well log response characteristic is analyzed. The comprehensive identification method for water flooded zone of fractured low permeability conglomerate reservoir at the mid-late stage by water flooding process is proposed. The water flooded zones in tertiary infilling adjustment wells are explained. According to the production rates from these adjustment wells, the results from this method are coincident with the actual conditions by 93.8%. Also, the factors affecting the water flooded degree are analyzed. It is recognized that the distribution of water flooded zone is mainly controlled by fracture and water injection rate. In plane, the water flooded feature is dominated by injected water flooded type of EW direction followed by NS direction; while in the vertical, dominated by bedding water flooded type, in which the water flooded degree is generally affected by the openness of corresponding oil layer and the development o fracture system. The water flooded degrees of P₂W₃ and P₂W₄ are relatively serious, with 80~120 m in water flooded height, 300~500 m in the length and about 100 m in thickness.

Key words: Karamay oilfield, Lower Wuerhe formation, conglomerate reservoir, water flooded zone, feature, characteristic