Page 126 - Fundamentals of Gas Shale Reservoirs

106 PORE GEOMETRY IN GAS SHALE RESERVOIRS

8 9 10
10 6
P c (psi) 10 4 2

10
10 0 12 13 14
10 6
P c (psi) 10 4 2

10
10 0 17 18 20
10 6
P c (psi) 10 4 2

10
10 0
21 23 24
10 6
P c (psi) 10 4 2

10
10 0
25 26 27
10 6
P c (psi) 10 4 2

10
10 0
0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1
Sw (frac) Sw (frac) Sw (frac)

FIGurE 5.28 Capillary pressure curves: NMR T ‐equivalent Pc extracted from Equation 5.14 and MICP intrusion pressure for selected
2
gas shale samples.
TabLE 5.6 Extracted supplemental parameters from Nmr
and mICP tests
Sample P MICPTh Shift Scaling
number (psi) P ρ2 µm/ms factor (b) factor (c) 100,000
NMRTh
8 6,169 5633 0.020 0.11 3.60
9 2,337 3390 0.021 0.11 3.50
10 680 1203 0.032 0.11 4.00
12 1,795 1382 0.023 0.11 3.70 10,000
13 1,795 430 0.029 0.19 3.90
14 1,701 2850 0.027 0.11 3.90 NMR-derived threshold pressure (psi)
17 6,115 2384 0.011 0.11 3.90
18 10,027 5203 0.015 0.11 3.60 1,000
20 469 427 0.104 0.01 2.20
21 1,259 838 0.036 0.09 4.00
23 218 294 0.253 0.08 3.80
24 1,019 1279 0.015 0.09 4.00 100
25 4,460 2506 0.019 0.10 3.60 100 1,000 10,000 100,000
26 6,725 8242 0.004 0.11 3.80 MICP threshold pressure (psi)
27 5,895 2625 0.011 0.11 4.20
FIGurE 5.29 Threshold pressure from MICP and NMR.