Investigation of mechanical properties of bedded shale by nanoindentation tests: A case study on Lower Silurian Longmaxi Formation of Youyang area in southeast Chongqing, China

Xian SHI,Shu JIANG,Shuangfang LU,Zhiliang HE,Dongjie LI,Zhixuan WANG,Dianshi XIAO

Table 1 Analysis results of shale composition.

Parameter Mass fraction/% Area fraction/% Quartz class Quartz 27.38 26.92 Albite 21.52 23.94 Potash feldspar 1.91 2.20 Carbonate Calcite 4.47 5.12 Bitter spar 1.64 2.12 Clay class Illite 24.77 20.15 Kaolinite 2.13 1.22 Chlorite 2.10 1.77 Else 9.88 12.86