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对胜利油田不同深度的四口井的砂岩岩芯进行了三轴压缩试验和动态岩石力学参数试验。根据获得的垂直地层方向和平行地层方向的试验数据,计算了各岩石力学参数的各向异性系数。通过分析围压以及深度对各向异性系数的影响,给出了砂岩峰值强度各项异性系数、静泊松比各向异性系数、纵波波速各向异性系数、纵横波速比和动泊松比各向异性系数与深度的拟合公式。发现峰值强度、纵波波速和纵横波速比的各向异性系数都随着深度的增加而减小,而泊松比各向异性系数随着深度的增加而增大。动、静弹性模量各向异性系数与深度相关性都很差,动弹性模量各向异性较弱,静弹性模量相对较强。
Triaxial compression tests and dynamic rock mechanics parameters tests were carried out on sandstone cores of four wells at different depths in Shengli Oilfield. According to the obtained experimental data of vertical formation direction and parallel formation direction, the anisotropy coefficient of each rock mechanics parameter is calculated. By analyzing the effects of confining pressure and depth on the anisotropy coefficient, the anisotropy coefficient, static anisotropy coefficient, longitudinal anisotropy coefficient, longitudinal-to-vertical wave velocity ratio and dynamic Poisson’s ratio Fitting formula of anisotropy coefficient and depth. It is found that the anisotropy coefficients of peak intensity, longitudinal wave velocity and aspect ratio decrease with depth, while the Poisson’s ratio anisotropy coefficient increases with depth. Dynamic and static elastic modulus anisotropy coefficient and the depth of the correlation are poor, the dynamic elastic anisotropy of the weaker, static modulus is relatively strong.