Modeling the Viscoelastic Behavior of Quartz and Clay Minerals in Shale by Nanoindentation Creep Tests

<div>Linear regressions for employing the three-element Voigt model for quartz and clay minerals at various peak loads. Fitting parameters: (a) E<sub>1</sub>, (b) E<sub>2</sub>, and (c) <i>η</i><sub>1</sub>. Error bars are one standard deviation.</div>

Geofluids

fig8

Figure 8

Figure 8: Modeling the Viscoelastic Behavior of Quartz and Clay Minerals in Shale by Nanoindentation Creep Tests 