Research On Sedimentary Characteristics Of Fu-Yu Oil Layer In Zhaoyuan Area Of North Songliao Basin

Zhaoyuan oilfield is located in slope direction of Chaoyanggou terrace and Changchunling anticline belt. Fuyu Reservoir in the study area corresponds to three and four member of Quantou Formation, the characteristic of sand is thin single layer thickness, multi-layers, large differences between layers and poor continuity.The article study on high resolution sequence stratigraphy and sedimentary characteristics based on high resolution sequence stratigraphy theory and well drilling, well logging and seismic data.Standardized processing of logging curve, with the aid of well drilling, well logging data, established the identification of short-term base level cycle of objective layer in the study area, with the combination of short-term cycle changes, which can identify and superposition pattern of medium-term cycle ultimately identify 5medium-term cycle, 16 short cycle, with short cycle as a unit in the study area of single well sequence division and even well stratigraphic division and correlation,high resolution sequence stratigraphy framework is established.With characteristics of logging facies and comparative sedimentology methods to analysis the sedimentary facies of the study area, anastomosing river, meandering river subfacies is identified. Since the formation of F12 is delta plain formed by many terrestrial river, which influenced by tidal action is interwoven mesh on the plane, this time is anastomosing river depositional system of delta plain, and finally evolve to delta front subfacies in formation F11.Seismic horizon calibration in the study area, establish a well-seismic grid,isochronous tracking and contrasting wells in the grid. Using inversion data predictthe spatial distribution of reservoir sand bodies in the high frequency. Describe 16 layers, distribution characteristics of sedimentary facies plane by single well facies,sand distribution controlled by strata, and sand-thickness map. The deposition site of point bar in the study area with large thickness of sand and relatively coarse particle,fine reservoir property, which is different from the general channel lag deposit, here to sedimentary facies classification separately. In the vertical, datum were lifted up overall, the depth of water increase, channel sedimentation is weakened, channel thickness and phase domain distribution area is reduced from three member to four member of Quantou Formation.