Retrieving standard sized core plugs to perform conventional geomechanical testing on organic rich shale samples can be very challenging. This is due to unavailability of inch-size core plugs or difficulties in the coring process. In order to overcome these issues, statistical grid nanoindentation method was applied to analyze mechanical properties of the Bakken. Then the Mori-Tanaka scheme was carried out to homogenize the elastic properties of the samples and upscale the nanoindentation data to the macroscale. To verify these procedures, the results were compared with unconfined compression test data. The results showed that the surveyed surface which was 300 μm ×300 μm is larger than the representative elementary area (REA) and can be used safely as the nanoindentation grid area. Three different mechanical phases and the corresponding percentages can be derived from the grid nanoindentation through deconvolution of the data. It was found that the mechanical phase which has the smallest mean Young's modulus represents soft materials (mainly clay and organic matter) while the mechanical phases with the largest mean Young's modulus denote hard minerals. The mechanical properties (Young's modulus and hardness) of the samples in X-1 direction (perpendicular to the bedding line) was measured smaller than X-3 direction (parallel to the bedding line) which reflected mechanical anisotropy. The discrepancy between the macromechanical modulus from the homogenization and unconfined compression test was less than 15% which was acceptable. Finally, we showed that homogenization provides more accurate upscaling results compared to the common averaging method.

检索标准尺寸的岩心塞以对富含有机物的页岩样品进行常规的地质力学测试可能非常具有挑战性。这是由于无法获得英制尺寸的芯塞或取芯过程中的困难。为了克服这些问题，采用统计网格纳米压痕法对Bakken的力学性能进行了分析。然后，进行了Mori-Tanaka方案以使样品的弹性特性均匀化，并将纳米压痕数据放大至宏观尺寸。为了验证这些程序，将结果与无限制压缩测试数据进行了比较。结果表明，被测表面300μm×300μm大于代表基本面积（REA），可以安全地用作纳米压痕网格面积。通过对数据进行反卷积，可以从网格纳米压痕中得出三个不同的机械相和相应的百分比。发现平均杨氏模量最小的机械相代表软质材料（主要是粘土和有机物），而平均杨氏模量最大的机械相代表硬质矿物。测量样品在X-1方向（垂直于铺垫线）的机械性能（杨氏模量和硬度）小于反映机械各向异性的X-3方向（平行于铺垫线）。来自均质化和无侧限压缩试验的宏观力学模量之间的差异小于15％，这是可以接受的。最后，