The Role of Microfabric and Laminae on Pore Structure and Gas Transport Pathways of Marine Shales from Sichuan Basin, China
Table 2
Pore structure, porosity, permeability, and permeability anisotropy (β) of the shale samples.
Sample
Lithofacies
Porosity (%)
BET SSA (m2/g)
Pore volume (mL/g)
Pore diametera (nm)
(μD)
(μD)
Permeability anisotropy (β)
Slippage factor (MPa)
Transport pore diameterb (nm)
c (nm)
JYA-1
CM
2.1
10.1
0.0115
4.5
22.13
—
—
0.05
569
686
JYA-2
CM
1.5
9.7
0.0114
4.7
76.64
5.70
13.4
0.04
787
1386
JYA-3
CM
2.0
12.7
0.0133
4.2
64.70
1.30
49.8
0.04
826
1133
JYA-4
CM
4.2
14.0
0.0151
4.3
2.04
—
—
0.14
218
172
JYA-5
CM
4.3
14.1
0.0161
4.5
52.10
—
—
0.05
589
732
JYA-6
M
2.1
18.5
0.0190
4.1
25.92
8.90
2.9
0.12
269
740
JYA-7
CM
4.3
16.4
0.0178
4.3
—
—
—
—
—
—
JYA-8
CM
3.5
17.4
0.0186
4.3
7.76
0.73
10.6
0.10
322
342
JYA-9
M
3.3
14.5
0.0169
4.6
1.17
—
—
0.39
80
150
JYA-10
M
1.9
15.0
0.0171
4.5
68.20
7.63
8.9
0.03
983
1186
JYA-11
M
3.0
11.9
0.0150
5.0
14.22
—
—
0.13
246
481
JYA-12
M
2.4
18.7
0.0213
4.5
25.35
—
—
0.07
463
690
JYA-13
S
4.3
18.9
0.0211
4.5
7.53
—
—
0.16
256
307
JYA-14
S
5.0
20.6
0.0223
4.3
7.01
—
—
0.26
158
276
JYA-15
S
5.4
21.2
0.0244
4.6
10.96
—
—
0.14
305
326
JYA-16
M
1.9
10.8
0.0117
4.3
11.25
—
—
0.10
315
532
JYA-17
S
3.9
16.1
0.0196
4.9
24.41
—
—
0.14
294
545
JYA-18
S
3.4
18.4
0.0218
4.7
14.95
1.60
9.3
0.14
290
466
JYA-19
S
4.0
18.7
0.0210
4.5
1.09
—
—
0.37
111
133
JYA-20
S
4.4
18.7
0.0196
4.2
4.77
1.38
3.5
0.25
169
248
JYA-21
S
7.1
21.5
0.0229
4.3
2.33
—
—
0.34
120
145
JYA-22
S
5.8
26.8
0.0334
5.0
0.40
0.30
1.3
0.51
81
71
JYA-23
S
5.9
26.9
0.0254
3.7
—
—
—
—
—
—
aThe average pore diameter was determined by low-pressure N2 adsorption analysis. bThe transport pore diameter was derived from gas slippage measurement on parallel to bedding samples. cThe dominant pore-throat aperture was estimated using the Winland equation [59].
