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《Well Logging Technology》 2011-03
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Testing Characteristics and Log Interpretation of Rocks' Poisson Ratio Under Simulating Formation Condition

XIE Runcheng1,2,ZHOU Wen3,YANG Zhibin4,SHAN Yumin3,ZHOU Qiumei2,ZHANG Shengjun4(1.Mobile Postdoctoral Center of Southwest Petroleum University,Chengdu,Sichuan 610500,China; 2.College of Energy Resource,Chengdu University of Technology,Chengdu,Sichuan 610059,China; 3.State Key Lab of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu, Sichuan 610059,China;4.Research Institute of Southwest Branch,SINOPEC,Deyang,Sichuan 618000,China)  
The research of actual core rocks mechanical parameters and ultrasonic testing has been carried out in consideration of the formation confining pressure,lithology and fluid saturated conditions.The results show that the static Poisson ratio in mudstone is greater than that in sandstone,and the differentiation is greater under the uniaxial condition than that under the confined condition.With the same lithology and the fluid saturated condition,the static Poisson ratio under the confining pressure condition is larger than that under the uniaxial condition and with the increasing of confining pressure,the increase of static rock Poisson ratio in sandstone is larger than that in shale.Under the uniaxial conditions,the P-wave in water saturated rocks is 10%~15% lager than that in gas saturated rocks,the shear wave is totally the same and the dynamic Poisson's ratio in water saturated rocks is 30% lager than that in gas saturated rocks.Under the confining pressure condition,the velocity of P-wave and S-wave in water saturated rock samples increases when the confining pressure increases,the increase of P-wave velocity is smaller than that of S-wave velocity,the P-wave and S-wave velocity ratio decreases when the confining pressure increases,and the dynamic rock Poisson ratio decreases.The new model of logging interpretation formula for rock Poisson ratio has been established under the condition of simulating the formation confining pressure and fluid and distinguishing sandstone and mudstone.
【Fund】: 中国石化西南油气分公司重点科研项目“HA构造工程地质研究”(GJ-105-0818)资助
【CateGory Index】: P631.8
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