Nanoscale Pore Structure Characterization and Permeability of Mudrocks and Fine-Grained Sandstones in Coal Reservoirs by Scanning Electron Microscopy, Mercury Intrusion Porosimetry, and Low-Field Nuclear Magnetic Resonance
Table 2
Total organic carbon (TOC) contents and mineralogical compositions of the investigated rock samples.
Sample number
TOC (%)
Minerals (%)
Clay minerals (%)
Clay minerals
Quartz
K-feldspar
Plagioclase
Pyrite
Siderite
Kaolinite
Chlorite
Illite
%
JH-Y
10.81
26
52
5
13
4
60
10
7
23
25
JH-S
0.03
30
43
8
19
77
9
4
10
30
NT-Y1
5.18
34
24
3
6
33
55
23
11
11
25
NT-Y2
2.92
43
41
4
12
49
20
9
22
25
NT-Y3
3.29
25
16
1
2
56
46
23
13
18
25
NT-M1
1.73
55
35
3
7
34
26
14
26
20
NT-M2
0.84
49
35
4
12
44
25
12
19
25
NT-M3
0.62
42
39
4
12
3
45
26
10
19
25
NT-M4
0.73
50
38
3
9
39
25
13
23
25
NT-M5
1.08
47
37
4
12
45
23
13
19
25
NT-M6
1.21
44
41
3
12
44
25
12
19
25
NT-S
0.06
12
54
11
17
6
89
6
3
2
25
Note. represents regular illite/smectite mixed layer; % represents the percent content of smectite in regular .
