Study On Development Technology And Policy Of Turbidite Sandstone Oil Reservoir In N871 Block

N871 block Sha 3 middle sub-member reservoir belongs to low permeability turbidite sandstone reservoir,which has become an important target of N oilfield to increase production.At present,there are still some problems in the development of turbidite sand low permeability reservoirs in this block,such as difficulty in water control and oil stabilization,low utilization degree of thin effective thickness well area,low oil recovery rate,low recovery rate,imperfect injection-production well pattern system and so on.In view of the characteristics of this area,the following aspects of research work have been carried out.Firstly,the fine reservoir description of this block has been carried out,focusing on reservoir physical properties,fluid properties,temperature and pressure systems and reservoir types,and the horizontal distribution characteristics of the reservoir in Sha 3have been analyzed;Secondly,the comprehensive evaluation of the pre-development effect has been carried out,the main factors affecting the development effect have been analyzed,and the direction of development adjustment has been put forward;Thirdly,the reservoir geology and production characteristics in this block have been systematically analyzed.On the basis of the characteristics,the selection of formation development,well pattern,well spacing,production mode and pressure maintenance level are optimized by comprehensive application of relevant theories and empirical formulas,production data and reservoir numerical simulation results.On this basis,the development plan of this block is completed.Aiming at the geological characteristics of low permeability reservoir in block N871 and basing on reservoir geology research,this paper systematically studies the technical methods to improve the development effect of block N871,which has certain guiding significance for guiding the development of block N871 and similar reservoirs and improving recovery.