The Evaluation Of Water Flooded Layers Of Guantao Formation Of Kongdian Oil Field In Extra High Water Cut Period

The first exploration well K31 in Kongdian oil field was producing tested successfully in September 1972,consequently the Kongdian oil field was discovered.It has been 40 years since it begun to develop from October 1975.And up to now,it is in the high water flooded cut development stage since the waterflooding development in 1979.Kongdian well pattern was infilled step by step so that the logging series were not uniform,and there is a need for normalization,standardization of well log interpretation to reinstitute a new interpretation standard of the water-flooded layers.Based on the core analytical data with other geological,log and development data,we studied the water-flooded reservoir characteristic and then we established a standard to identify the water-flooded layer in KongErbei,a reservoir parameters interpretation model.At last,we analyzed the influence factors of waterflooding and concluded the water-flooded laws:1.Guantao formation in Kongdian are fluviatile facies,the reservoirs have large difference of physical properties and complex connected relations.Because of the low structure angle,the poor oil-water differentiation and the high movable water,research area has no net pay zone and water-free oil production period.So the reservoir has the characteristics of oil-water transition zone.Major reservoir oil-bearing areas are large,wide distribution.The non-majors are smaller than the majors.2.In the waterflooding oil field,there are several methods,such as the migration of spontaneous potential,contrastive analysis of neighboring well on resistivity,the normal distribution method and so on.3.According to the characteristics in late high water cut development in research area,we established the remaining oil forcast model,and a comprehensive quantitative identification method was put forth to evaluate the water-flood layers.4.The remaining oil is rich in the upper thick layers with poor permeability,fault nearby areas where the well pattern is difficult to control,edge of the main facies areas with poor connection,non-major facies belts with low producing degree.