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《Journal of Jilin University(Earth Science Edition)》 2010-06
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Application of Variable T_2 Cutoff Value to Determine Irreducible Water Saturation

SU Jun-lei1,WANG Yan2,SUN Jian-meng11.College of Geo-Resources and Information,China University of Petroleum,Dongying,Shandong 257061,China2.Well Logging Company,Daqing Petroleum Adminstration Bureau,Daqing,Heilongjiang 163412,China  
Based on T2 cutoff value model,to determine the irreducible water saturation we used three kinds of variable T2 cutoff value method,a fixed cutoff value of experience,experience variable T2 cutoff value,and the Coates permeability model,and comparative analysis has been done in order to get accurate result.Additionally,experimental data with conventional core analysis verified the accuracy.The results indicated that the average relative error between the irreducible water saturation computed by variable T2 cutoff value based on Coates permeability model and irreducible water saturation got by conventional core analysis is 9.5%.Additionally this method can be used to determine Coates model of regional experience in the coefficient of C,m,n and improve the accuracy of NMR permeability.
【Fund】: 国家“863”计划项目(2006AA060105)
【CateGory Index】: P631.817
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