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《Journal of Earth Sciences and Environment》 2014-04
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Fluid Property of Tight Sandstone Reservoir Identified with Elastic Parameters

BIAN Hui-yuan;WANG Fei;YUE Chong-wang;ZHANG Yong-hao;School of Energy Resources,China University of Geosciences;School of Geology Engineering and Geomatics,Chang'an University;CNPC Logging Co.,Ltd.;  
Tight sandstone reservoirs in Sulige gasfield of Ordos Basin have the characteristics of complicated pore structure,low porosity,low permeability and strong heterogeneity,and the fluid identification of reservoir is difficult.According to the dipole acoustic logging data,based on rock elastic parameters of tight sandstone,fluid properties of tight sandstone reservoir identified by index method,crossplot method and support vector machine were discussed.The results show that ratio of time differences of longitudinal and shear waves,ratio of compressibility and poisson ratio and ratio of differences of elasticity moduli of longitudinal wave can be used to identify the gas reservoir;the gas-sensitive elastic parameters are selected optimally, which are fluid sensibility evaluation parameters including product of Lame coefficient and density,Lame coefficient,bulk modulus,ratio of Lame coefficient and shear modulus and elasticity modulus,and the accuracy of fluid identified by support vector machine is improved;compared with the gas production test results of reservoir sample,the prediction matching rate reaches 92% by supportvector machine.Finally,well X350 in Sulige gasfield was used to verify the gas production test results.It is verified that the gas-sensitive elastic parameters selected optimally are used to identify the reservoir fluid by the means of support vector machine.
【Fund】: 国家科技重大专项项目(2011ZX05009-001)
【CateGory Index】: P618.13
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