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《Geophysical Prospecting for Petroleum》 2013-05
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Elastic parameters calculation for tight sand reservoir based on Biotconsistent theory

Yin Xingyao;Liu Xinxin;Cao Danping;School of Geosciences,China University of Petroleum (East China);  
The coexistence of pores and cracks in tight sandstone causes the absence of correlation between velocity and porosity and the wide range in velocity variation.A method to calculate elastic parameters of tight sandstone reservoirs was proposed.According to Biot-consistent theory,Poissons ratio of rock frame is introduced. When the Biot-consistent condition is satisfied,the elastic modulus of the rock frame is calculated.Then combined with the volume fraction of cracks obtained by constrained inversion,the elastic parameters of tight sandstone containing both pores and cracks are calculated in the framework of Biot theory.The method is free of pores except for cracks and avoids the calculated errors caused by the inappropriate choice of porous parameters.The calculated elastic parameters of actual tight sandstone reservoirs provide favorable elastic parameters for S-wave velocity calculation and fluid sensitive parameters crossplot analysis.Meanwhile,it shows a good result and proves the feasibility of the method.
【Fund】: 国家重点基础研究发展计划(973)项目(2013CB228604);; 国家科技重大专项(2011ZX05030-004-002 2011ZX05019-003);; 国家自然科学基金项目(41004050)共同资助
【CateGory Index】: P618.13
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