Correlation of Dynamic and Static Elastic Parameters of Rock

Differences exist in dynamic and static elastic parameters of the same rock. It has important significance for fracturing in reservoirs to obtain the transformation functions between dynamic and static elastic parameters, and experiments were done under reservoir conditions. Rock mechanical properties of tight sandstones under reservoir conditions (including formation temperature and pressure) in A Gas field were obtained. It demonstrated that the static elastic parameters (the static Young's modulus and the static Poisson's ratio) are different from the dynamic elastic parameters (the dynamic Young's modulus and the dynamic Poisson's ratio) in the same core samples under the same experimental conditions, when the temperature or pressure changes. Analyses on the mechanism of this phenomenon were done, and the transformation functions between the dynamic and static elastic parameters under different temperature or pressure were obtained. The parameters under reservoir conditions were useful in tight sandstones in A Gas field, and they are foundation for the development of oil layer fracturing program.