Abstract: Identification and utilization of fine structure are required in high water-bearing phase of oilfield development using the high-solution seismic technology Fine structures include low amplitude structure and reservoir mini structure，but they differ in formation and require different methods in identification Low amplitude structure can not be determined in seismic profiles by ordinary data processing and interpretation. Utilizing 3-D high-resolution seismic technique，low amplitude structures，which consist of small size and small area structura1 deformation，low fluctuation and tilt，and so on，can be identified in seismic profile. While reservoir mini structure are formed in sedimentation and related to sedimentary environment，different compaction and paleotopography. The top and bottom of oil layers are not even with small local fluctuation and tilt. The late development phase of Daqing oilfield is characterized by high water-bearing reservoir. Based on the 3-D high-solution seismic technology, low amplitude structures are focused on. The identification methods of low amplitude structure include semi-automatic layer tracing，velocity scanning for calculating velocity，structure trend analysis and automatic identification of small fault Especially with the method s of slip correlation，dip angle scanning，relative dimension，the smal1 faults in formation can be identified. The effect factors of identification include seismic processing and interpretation. These methods were applied to Yushulin oilfield of Daqing to predict small fault as well as to determine the plan of exploration and development. According to close spacing well logging data，utilizing mini structure plot and trend surface remaining analysis，the fluctuation extent an d shape of bedding plane of reservoir can be described in detail. P1oting the structure contour is the key to identify reservoir mini structure. The effects of sedimentary micro-facies ，boundary of sedimentary unit，topography and tilt of well are taken into account. Combination of reservoir mini structure and sedimentary micro-facies can be used to determine the relatively abundant areas of remaining oil. At the later high water-bearing development stage of heterogeneous sand body oilfield，study of the identification method of fine structure and presentation effect factors of identification process are used to understand the heterogeneity of reservoir and establish the fine structure mod el，which can be used to predict the distribution of remaining oil and locate effective wells.