Table 2 Parameters extracted from the pressure dependent porosity (PDPo) and permeability (PDP) data shown in Fig. 5. Also shown is a comparison of the inferred CP∞ to that expected from Eq. (3), CP,EMT. Finally, the inferred pore sizes, rP are compared to that measured via common microstructural characterization techniques. The value in parenthesis is inferred by accounting for the microcrack compliance as discussed in the supplementary information (see Microcrack Stiffness section, Eq. S9).
From: Origins of pressure dependent permeability in unconventional hydrocarbon reservoirs
Sample | EMT | Poro | MICP/N2 | Poro | |||||
|---|---|---|---|---|---|---|---|---|---|
CS-CP∞ (GPa−1) | ϕSlit | dCP/dϕ (GPa−1) | CP∞ (GPa−1) | CP,EMT (GPa−1) | 2rP (nm) | 2rP,meas (nm) | ϕmeas | b (nm) | |
Bakken | − 0.014 | – | – | 0.028 | 0.032 | 4.4 | 13 | 0.035 | |
Bakken w/ inclusions | − 0.013 | 0.0002 | 0.038 | 0.027 | 0.033 | 16.4 | 12 | 0.048 | 6210 |
Mancos | − 0.018 | 0.0017 | 0.023 | 0.045 | 0.044 | 8.8 | 5 | 0.068 | 1840 |
Wolfcamp cemented | − 0.44 | – | – | 0.43 | 0.022 | 6.4 | 7.3 | 0.025 | |
Wolfcamp | − 0.58 | 0.006 | 0.154 | 0.55 | 0.06 (0.5) | – | 3.3 | 0.11 | 1160 |
