Low‐frequency forced‐oscillation methods applied to a reservoir sandstone allowed determination of the Young's modulus and Poisson's ratio (from axial loading), bulk modulus (by oscillation of the confining pressure), and shear modulus (from torsional forced‐oscillation), for comparison with conventional ultrasonic data. All tests were performed on a common sandstone core sample from an oil reservoir offshore West Africa. The results show a steady increase in ultrasonic velocities and shear modulus of the dry specimen as functions of pressure, which suggests a progressive closure of the inter‐granular contacts. An increase of bulk and Young's moduli and Poisson's ratio is observed on decane‐saturation of the sample when tested with a sufficiently small dead volume. This observation, consistent with Gassmann's theory, suggests that such measurements probe undrained (saturated isobaric) conditions. Diminution or absence of such fluid‐related stiffening for low‐frequency measurements with dead volumes comparable with the pore volume of the specimen indicate partially drained conditions and highlight the critical role of experimental boundary conditions. Directly measured bulk and shear moduli are consistent with those derived from Young's modulus and Poisson's ratio. These results of the inter‐laboratory testing using different measurement devices are consistent in terms of the effect of frequency and fluid saturation for the reservoir sandstone specimen. Such broad consistency illustrates the validity of forced‐oscillation techniques and constitutes an important benchmarking of laboratory testing of the elastic properties of a porous medium

中文翻译：

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储层砂岩的弹性特性：宽带实验室间基准测试

应用于储层砂岩的低频强制振荡方法允许确定杨氏模量和泊松比（来自轴向载荷）、体积模量（通过围压振荡）和剪切模量（来自扭转强制振荡），对于与传统超声波数据的比较。所有测试都是在来自西非近海油藏的普通砂岩岩心样本上进行的。结果表明，作为压力的函数，干燥样品的超声速度和剪切模量稳步增加，这表明颗粒间接触逐渐闭合。当用足够小的死体积进行测试时，在样品的癸烷饱和度上观察到体积和杨氏模量和泊松比的增加。这一观察结果与加斯曼的理论一致，表明这种测量可以探测不排水（饱和等压）条件。在死体积与试样孔隙体积相当的低频测量中，这种流体相关硬化的减少或不存在表明部分排水条件，并突出了实验边界条件的关键作用。直接测量的体积和剪切模量与从杨氏模量和泊松比得出的一致。这些使用不同测量设备的实验室间测试结果在频率和流体饱和度对储层砂岩试样的影响方面是一致的。这种广泛的一致性说明了强制振荡技术的有效性，并构成了多孔介质弹性性能实验室测试的重要基准