Abstract: In order to accurately measure static and dynamic mechanical parameters of reservoir rock mass,establish their relation and discuss the factors that result in their differences,dynamic and static mechanical parameters of 49 reservoir rock samples were synchronously measured under simulated in-situ reservoir conditions,with the influences of confining pressure,pore pressure,temperature and saturated fluids being considered.The results show that static and dynamic Young's modulus correlate well under in-situ conditions.For low permeability reservoir,dynamic Young's modulus is generally greater than the static,and their difference will get greater with the increasing of dense degree.For different samples,building dynamic and static Young's modulus plates based on subdivision of physical properties can greatly improve the relevance and accuracy.Finally,the dynamic and static Young's modulus calibration plates under in-situ conditions are built according to the differences of physical properties between samples from the low permeability reservoir rocks in Songliao and Ordos basins.The plates not only can be used to establish mechanical parameter field and stress field of low permeability reservoir rock mass,but also provides more reliable data for optimizing the design of fracturing parameters and improve the success rate of operation.

Key words: in situ condition, dynamic and static parameter, Young's modulus, rock mass mechanics, tight sandstone