Abstract
Rock mechanics parameters can reflect the brittleness of the formation and determine the effect of reservoir fracturing, and they are very important for improving unconventional oil and gas production. Triaxial compression test and acoustic pulse test are carried out in the sandstone samples of Benxi formation in Yanchang gas field of Ordos basin in order to obtain the accurate mechanical properties of the formation. The static elastic modulus ranges from 23.74 GPa to 32.46 GPa and the static Poisson’s ratio ranges from 0.181 to 0.239 in triaxial compression test. The dynamic elastic modulus ranges from 33.18 GPa to 52.56 GPa and the dynamic Poisson’s ratio ranges from 0.26 to 0.30 in acoustic wave test. It can be seen that the dynamic parameters are generally larger than the static parameters, and the relation between them is Es = 0.3624Ed + 11.865, R2 = 0.8119; μs = 1.243μd - 0.0911, R2 = 0.7267.The relation between dynamic and static rock mechanics parameters provides a reliable parameter basis for the study of mechanical properties, brittleness and fracturing.
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