The Well Logging Evaluation Study Of Fresh Water Flooded Layer In The N Region

In the whole world,the proportion of oil and gas production in water injection well is increasing,accounting for an increasing proportion of the total large.At present,the N block has entered the high saturated water stage after a long time development.The flooding level identification and quantitative interpretation become particularly important for the flooded layer.The accuracy of calculation seriously affects the accuracy of interpretation and is of great significance to guide oilfield production.This paper first collects a large number of experimental data of the block from N block,and uses the experimental data to emphatically analyze the changes and law of the parameters in the process of freshwater flooding.And then comprehensive analysis of the well log characteristics of the block corresponding to different flooding conditions provides theories foundation for the subsequent qualitative and quantitative determination flooded layer.In this paper,firstly,the core reset is carried out based on the block data,and the interpretation model of the logging parameters is established.Then,the method of material balance of variable magnification is studied and improved.Combining the improved method with Archie formula,applying geological constraint and simulating flooding dynamic process to obtain the key parameters of flooded layer,resistivity,residual oil saturation and Water production rate.According to the actual situation of the block,the flooded levels suitable for the N block are divided.These results of the research are applied to logging data of the 43 wells in the block and coincidence rate of the comprehensive Interpretation is 90% with good geological application effect.