The Exquisite Comparison of Shale Mineralogical-Geochemical Characteristics between Chang 7 Member and Chang 9 Member in Yanchang Formation, Ordos Basin
Table 2
Mineralogy of 60 Yanchang shale samples.
Number
Depth (m)
Member/SM
Kaolinite
Chlorite
Illite
Illite/smectite mixed layer
Illite/smectite mixed layer ratio
Clay minerals
Quartz
K-feldspar
Plagioclase
Calcite
Dolomite
Pyrite
Siderite
1
1609.95
C7-2SM
0
37
27
36
15
55
30
7
8
0
0
0
0
2
1613.1
C7-2SM
0
31
24
45
15
65
22
7
6
0
0
0
0
3
1620.01
C7-2SM
0
10
31
59
15
31
31
7
12
0
4
15
0
4
1201.47
C7-2SM
0
29
28
43
15
48
36
8
8
0
0
0
0
5
1203.47
C7-2SM
0
18
28
54
15
54
29
8
6
0
3
0
0
6
1209.42
C7-2SM
0
19
26
55
15
51
33
7
9
0
0
0
0
7
1212.53
C7-2SM
0
13
29
58
15
40
28
8
19
0
0
2
3
8
1451.1
C7-2SM
10
16
25
49
15
57
27
5
6
0
0
5
0
9
1452.37
C7-2SM
16
18
36
30
15
57
26
5
9
0
0
3
0
10
1454.42
C7-2SM
9
10
26
55
15
63
23
7
7
0
0
0
0
11
1455
C7-2SM
0
23
24
53
15
48
28
5
7
10
0
2
0
12
1457.04
C7-2SM
0
19
24
57
20
56
29
7
5
0
0
0
3
13
1139.1
C7-2SM
0
8
12
80
15
53
30
7
8
0
0
2
0
14
1145.2
C7-2SM
49
3
11
37
20
48
37
2
8
0
3
0
2
15
1146.16
C7-2SM
4
3
18
75
20
45
36
2
10
0
3
0
4
16
1152.35
C7-2SM
10
13
21
56
15
57
30
7
6
0
0
0
0
17
1155.45
C7-2SM
15
16
22
47
15
39
29
6
9
0
0
17
0
18
1443.77
C7-2SM
0
17
26
57
15
51
26
3
4
0
16
0
0
19
1446.15
C7-2SM
0
16
27
57
15
43
35
8
10
0
0
4
0
20
1447.28
C7-2SM
0
23
24
53
20
45
31
9
6
5
0
4
0
21
1449.49
C7-2SM
0
12
26
62
15
37
31
7
9
0
0
16
0
22
1511.17
C7-2SM
0
14
29
57
15
59
23
5
8
0
0
5
0
23
1516.86
C7-2SM
0
18
21
61
15
56
30
6
8
0
0
0
0
24
1518.62
C7-2SM
0
25
25
50
15
55
29
6
10
0
0
0
0
25
1519.55
C7-2SM
0
25
23
52
15
51
30
6
5
0
0
8
0
26
1608.98
C7-3SM
9
2
21
68
15
44
18
0
4
3
0
0
31
27
1609.18
C7-3SM
9
4
22
65
15
51
22
4
10
1
0
0
12
28
1611.42
C7-3SM
7
7
24
62
15
50
22
3
14
1
0
1
9
29
1611.46
C7-3SM
8
8
17
67
15
50
18
3
7
1
0
8
13
30
1613.08
C7-3SM
4
5
23
68
15
50
22
0
8
3
0
2
15
31
1613.68
C7-3SM
0
10
22
68
15
50
30
0
8
3
0
1
8
32
1619.02
C7-3SM
1
2
18
79
15
42
13
1
12
1
6
22
3
33
1620.38
C7-3SM
0
5
21
74
15
49
25
2
15
2
0
4
3
34
1621.45
C7-3SM
2
4
21
73
15
39
28
3
17
3
0
2
8
35
1386.54
C7-3SM
0
4
20
76
15
43
19
4
9
5
9
2
9
36
1386.58
C7-3SM
0
4
23
73
15
46
20
4
9
6
3
3
9
37
1388.2
C7-3SM
0
7
23
70
15
50
22
5
13
1
0
2
7
38
1392.02
C7-3SM
0
5
24
71
15
48
24
3
14
0
0
0
11
39
1392.46
C7-3SM
0
6
24
70
15
48
27
2
11
3
0
2
7
40
1399.05
C7-3SM
0
7
22
71
15
56
23
2
12
0
0
3
4
41
1399.08
C7-3SM
0
8
22
70
15
50
28
0
16
0
0
2
4
42
1399.37
C7-3SM
0
7
22
71
15
43
25
0
17
2
0
13
0
43
1750.3
C9M
0
11
27
62
15
44
36
3
11
3
0
3
0
44
1755.28
C9M
0
22
30
48
15
53
39
0
6
0
0
2
0
45
1753.25
C9M
0
15
27
58
15
41
30
0
14
0
5
10
0
46
1754.43
C9M
1
1
10
88
15
45
46
0
2
0
6
1
0
47
1360
C9M
0
23
39
38
15
43
42
2
8
0
3
2
0
48
1362.17
C9M
0
18
35
47
15
47
37
0
8
2
2
4
0
49
1364.02
C9M
0
15
18
67
15
44
41
0
12
3
0
0
0
50
1365.15
C9M
0
25
28
47
15
40
47
0
10
3
0
0
0
51
1603.35
C9M
0
17
31
52
15
44
36
2
13
0
2
3
0
52
1603.73
C9M
0
7
25
68
15
42
40
1
9
1
6
1
0
53
1604.16
C9M
0
17
23
60
15
52
29
4
11
0
0
4
0
54
1604.66
C9M
0
16
22
62
15
41
35
4
12
3
0
5
0
55
1597.2
C9M
0
24
32
44
10
49
36
0
8
0
3
4
0
56
1663.39
C9M
0
19
25
56
15
64
23
5
6
0
0
2
0
57
1667.36
C9M
0
15
20
65
15
55
33
0
9
0
0
3
0
58
1668.27
C9M
0
16
25
59
15
48
32
3
11
3
0
3
0
59
1671.39
C9M
0
10
21
69
15
55
32
0
10
0
0
3
0
60
1671.89
C9M
0
15
33
52
15
45
38
0
14
0
0
3
0
Note: SM means submember. Unit of mineral composition is percentage (%). The percentage of types of clay minerals (e.g., kaolinite and illite) is relative to the clay mineral section rather than the whole rock.
