A Study On Classification And Water Flooding Law Of FUYANG Layer In The Ultra-low Permeable Reservoir

With the continuing development, the effect of potential diging of old area in Daqing oil field is attenuating,and gradually rely on the development of the peripheral area,which is becoming the major taget of the Daqing oil field development.Of the ultra-low permeable reservoirs in peripheral area,the FUYANG oil layer is a representative sample.It distributes in the CHAOYANGGOU oil field,the YUSHULIN oil field and the TOUTAI oil field.Because of the characteristics of its narrow pore throat radius,low permeability and so on made it hard to do injection,the development strategy study become prticularly important.Reservoir classifying plays an important role during the study of the development strategy for different area in oil field,and is the foundation of evaluating reservoir development effect and making development strategy.Because the past way of reservoir classification can’t describe the ultra-low permeable reservoirs pertinently,this article give the result of the classification of the peripheral area of CHANGYUAN ultra-low permeable reservoirs in the layer of FUYANG with the method of clustering analysis,which use the major parameters determined by gray relevancy analysis with the deepest degree of association.After then,this article gives the boundaries of different major parameters after teating with the static parameters,and adjust part of the classification result atter testing with the dynamic parameters to make sure the right result.This article use the weight coefficient method to evaluate layers comprehensively,and contact with the classification result to give the distribution of reserves.Different method of studying the waterflooding law must be chosen according to the fact that different reservoirs has different geological conditions.This article studies the method of water-drive laws curve, displacement curve, Logistic cycle mode, TongXianZhang curve,and compared them.Finally chose the TongXianZhang curve and the first type of water-drive laws curve to predict the first and the second reservoir category,which have the oil recovery rate at 29.15% and 22.64%;and the chose the Convex type displacement curve to predict the third and the fourth reservoir category, which have the oil recovery rate at 17.66% and 13.67%.