Research Article
Mechanical-Chemical-Mineralogical Controls on Permeability Evolution of Shale Fractures
Table 7
Predicted versus observed effective hydraulic aperture increase for Longmaxi shale and Green River shale (pH = 4.0 and 5.0).
| | Shale name | Fluid pH | Confining stress (MPa) | Calculated (μm/min) | Observed (μm/min) | Relative error (%) | Corresponding (mol/m2 s) |
| | Longmaxi | 4.0 | 3.0 | 0.3872 | 0.1811 | −53.23 | 4.36 × 10−5 | | 4.0 | 5.0 | 0.3787 | 0.1420 | −62.51 | 3.52 × 10−5 | | 4.0 | 10.0 | 0.3630 | 0.1496 | −58.79 | 3.89 × 10−5 | | 5.0 | 3.0 | 0.0369 | 0.0195 | −47.19 | 5.47 × 10−6 | | 5.0 | 5.0 | 0.0354 | 0.0085 | −75.98 | 3.08 × 10−6 | | 5.0 | 10.0 | 0.0325 | 0.0055 | −83.08 | 2.79 × 10−6 |
| | Green River | 4.0 | 10.0 | 0.3653 | 0.1106 | −69.72 | 2.91 × 10−5 | | 5.0 | 10.0 | 0.0322 | 0.0305 | −5.35 | 9.12 × 10−6 |
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