The Interpretation Method Study Of Water-flooded Formation In Donghetang Oilfield

Flooded layer is the consequent result of flood development,the production of reservoir turns into oil and water,it is the inevitable product of oil field development,water flooded layer can be divided into injected flooding and side or bottom water flooding.At present,most of the production area of Donghetang oilfield has entered the late of development life;composite water saturation rose rapidly,flooding well logging become particularly important.Because of the Donghetang oilfield buried deeply,the strong vertical heterogeneity is,the complex reservoir feature,and the alternation of injection water salinity,the law of water flooding is very complex,which brings great difficulty to well logging interpretation of water flooded layers.Based on the analysis of characteristics of the reservoir,this paper studies the law of water-flooding,analysis the characteristics of water-flooded layer.Combining water-flooded layer characteristic,the paper carries on water-flooding mechanism research.Based on the analysis of coring,laboratory testing,test oil,geological and production performance data,this paper establishes the logging interpretation model of water flooded layer.Using the logging response characteristics of water flooded zone,this paper establishes a set of logging evaluation system suitable for the water flooded zone,focus on the interpretation evaluation of the target water flooded zone,improves the interpretation coincidence rate of adjustment wells effectively,finally services the oilfield and enhances the recovery efficiency.The conventional logging data are not adapted to the cased holes,the curves of Neutron lifetime logging,C/O,Dielectric logging,Formation elements logging are used to monitor the distribution of the saturation of residual oil,identify the property of the oil and water,judge the water flooded degree.At the same time,many kinds of interpretation are established and verified in many wells.