..., The feasibility of scratch test to estimate rock strength and Niobrara shales). The minerology of the core parameters has been established (Adachi et al., 1996; samples shows a predominance of quartz and calcite Schei et al., 2000; Richard et al., 2012). In an minerals in the compositions. The core samples...

... formations, using Niobrara shale samples. We first obtained the mechanical and elastic properties of Niobrara shale samples using the scratch test method. Subsequently, we treated the core sample with a cultured microbial solution at distinct conditions. Further, we obtained the new geomechanical properties...