Research On Logging Evaluation Method For Water-flooded Zone In Guan 104 Block

Guan 104 Block had been flooded since the end of 1991 when the oilfield water-flooding productive,and it had been a high water cut stage.The layer had been damaged and the production of oil was very low,which resulted in the original injection and production strata had been disrupted and forcibly developed.Because of strong reservoir heterogeneity,contradiction of layers and serious onrush of water-flood formation,which makes the relationship between water and oil very complicated.It is very difficult that use the present technology to discriminate flooding levels by using logging data,and logging interpretation technology of Guan 104 Block has become the key of development of reservoir.In order to precisely evaluate the water-flooding formation of Guan 104 Block.This paper is based on a synthetic analysis of core data,fluid analysis data,background of geological and dynamic production data,the summary of physical characteristics and log response which are different from before and after flooding,and then it is important to find the sensitive logging curve of flooding.We use cross-plot method,neural network method and decision tree arithmetic to identify flooded layer.Besides,building the property parameter interpretation model,the calculation error of porosity and permeability are less than 7%.Dynamic analysis and combing changes in formation water resistivity during the development,which are used to accurately calculate the resistivity of mixed formation water,and then the three saturation model is set up.At last,suitable model of current water-flooding development stage of Guan 104 Block,which made on the basis of dynamic production data,testing and production test data.Finally,under the extended model,logging data of Guan 104 Block had been processed and interpreted.By comparing the new and old interpreting conclusions,the new one has higher precision.