The Research Of Log Interpretation Methods Of Single Sand Layer Thickness And Parameters For Gaotaizi Zones In The Middle Development District Of Saertu Oilfield Of Daqing Placanticline

At present, the middle development zone of Saertu oilfield of Daqingplacanticline in central depression belt of Songliao basin has entered into highwater-cut or extra high water-cut development stage. Sertu zones, Putaohua zonesand Gaotaizi zones have been fully invested and developed. water flooding, polymerflooding and chemical flooding coexist. The distribution of the remnant oil is complexand difficult to be described, and the heterogeneity of reservoirs need to be clearlyunderstand for it being researched.The basis for stratum’s non-uniform depiction ispartition of well point single sand layer and interpretation of porosity,permeability,and saturation.Because of being influenced by geologic coringdata,later development of Gaotaizi zones, and lack of geologic cognitions for this, theinterpretation method for the thickness, porosity, permeability and saturation of singlesand layer of Gaotaizi zones has followed the method of Saertu zones. Thepractice has neither consideration of the changes of sedimentary characteristics norsubdividing interpretation unit, so the interpretation accuracy is hard to meet thedemand of production, which can have a major impact on making perforation schemefor new drilling well of productivity construction blocks and fine adjustment anddigging the potential of Gaotaizi zones of the oilfield.In recent years, with the coringdata being constantly enriched, our geological understanding is being graduallydeepened, we already have the research conditions for parametersinterpretation method of Gaotaizi zones in Sazhong development district.Based on the existing basic data and practical experience in Sazhongdevelopment district, we carried out the method research for the thickness partitionand interpretation of porosity, permeability and saturation of single sand layer ofGaotaizi zones in this paper, which has been applied in specific production andresearch work, which laid the foundation of accurate description of Gaotaizi zones,residual oil analysis, and development analysis and design, which guided andsupported water-controlling and potential-tapping of water flooding for Gaotaizizones, and so far the better results have been seen. The research in this paper hasreference meaning to those basic researches for reservoir stratum of similar oilfields.