Abstract: The conglomerate oilfield in northwestern margin of Junggar basin has its recovery percent of recoverable reserves of 71.24% andcomposite water cut of 70.7% at present. For the characteristics of the conglomerate reservoirs with high water cut, effctive stimulations shouldbe comprehensively applied to gain better exploitation effectiveness, and economical limitation for the stimulations be determined to providedecision-making basis for investment of the stimulations. 'The economical limitation water cut for highwater cut conglomerate reservoir is definedas quasi-economical limitation water cut and economical limitation water cut. According to changes of stimulation cost, operation varied cost andoil price, the chart related to the stimulation economical limitation and oil price, stimulation cost, operation varied cost is developed. And takingClass I, lI, III typical conglomerate reservoirs in northwestern margin of Junggar basin as examples, quantitative estimation and analysis aremade in the limitation. 'The application of this method will allow to effectively decrease the composite run cost of the stimulations and thus to fur-rtereyrereaecalateefstteiai Electronic Publishing House. All rights reserved.

Key words: Karamay oilfield, conglomerate reservoir, high water cut stage, stimulation, economical benefit, chart