Mechanical Response of Castlegate Sandstone under Hydrostatic Cyclic Loading

Figure 7

Permeability determinations: (a) permeability as a function of time during 8-hour cycle tests; (b) permeability as a function of time during 4-hour cycle tests (CG_006, CG_007), 2-hour cycle tests (CG_010), and tests without stress cycling (CG_009); (c) permeability measured at intervals of 0.69 MPa during the initial confining pressure loading of CG_005, CG_006, and CG_007, prior to stress cycling initiation.

(a)

(b)

(c)