Table 3 Excess silicon, quartz of different sources, and rock mechanical parameters in samples collected in well W202.

From: Influence of quartz types on mechanical parameters in the early silurian Longmaxi shale, Sichuan Basin

Sample No.

Graptolite zone

Siexcess/%

DQ/%

CTQ/ %

BQ/ %

DQ proportion/ %

CTQ proportion, %

BQ proportion, %

σ

E/GPa

BI%

w202-41

 

33.63

30.31

5.99

27.64

47.40

9.37

43.23

0.18

30.02

58.49

w202-50

 

9.21

34.05

5.89

3.32

78.70

13.61

7.69

0.21

34.14

54.32

w202-49

LM6-LM8

9.80

33.45

5.63

4.17

77.33

13.03

9.64

0.21

31.98

53.76

w202-48

 

6.13

34.01

5.91

0.21

84.73

14.73

0.54

0.19

30.54

57.46

w202-42

 

7.39

33.55

6.45

0.94

81.96

15.75

2.30

0.19

32.33

58.22

w202-40

 

7.70

44.00

7.39

0.32

85.10

14.29

0.62

0.17

25.81

57.27

w202-38

 

22.34

37.89

6.42

15.92

62.91

10.66

26.43

0.20

27.96

53.61

w202-39

 

15.58

37.86

7.39

8.20

70.84

13.82

15.34

0.21

29.50

51.89

w202-36

 

17.12

40.47

6.98

10.14

70.27

12.12

17.61

0.23

31.76

49.66

w202-37

 

11.24

43.96

6.78

4.46

79.64

12.28

8.08

0.20

31.72

55.26

w202-34

 

17.76

41.21

7.11

10.65

69.88

12.05

18.07

0.20

30.18

54.49

w202-35

LM4-LM5

15.52

41.49

7.16

8.36

72.78

12.55

14.67

0.18

30.65

58.52

w202-33

 

18.80

38.81

6.02

12.79

67.37

10.44

22.19

0.17

33.79

62.17

w202-31

 

19.19

38.63

6.24

12.94

66.82

10.80

22.39

0.17

31.54

61.92

w202-30

 

14.71

44.10

6.52

8.19

74.99

11.09

13.92

0.22

26.36

48.35

w202-27

 

36.66

23.04

1.85

34.81

38.59

3.10

58.31

0.15

36.16

69.55

w202-29

 

60.02

14.18

1.70

58.32

19.11

2.29

78.59

0.14

36.00

69.77

w202-28

 

63.96

14.22

1.55

62.41

18.19

1.98

79.83

0.14

35.69

70.54

w202-26

 

61.67

12.10

1.12

60.55

16.40

1.51

82.08

0.12

33.87

73.49

w202-24

LM1-LM3

80.34

6.03

0.76

79.58

6.99

0.88

92.13

0.12

31.85

71.73

w202-22

 

77.10

7.37

0.89

76.21

8.73

1.05

90.22

0.10

30.63

74.21

w202-25

 

61.35

13.76

1.78

59.57

18.32

2.37

79.32

0.12

29.99

70.19

w202-23

 

65.21

11.78

1.88

63.33

15.31

2.44

82.25

0.17

34.02

62.62

SY-2

 

32.95

27.68

5.02

27.93

45.65

8.28

46.07

0.14

45.71

77.51

SY-3

 

57.50

22.10

3.74

53.76

27.76

4.70

67.54

0.14

44.29

76.49

SY-9

 

57.87

20.63

4.52

53.36

26.28

5.76

67.97

0.13

45.71

80.51

SY-11

 

65.69

17.16

4.27

61.42

20.71

5.15

74.13

0.12

50.00

84.57

SY-12

Cited from Xi et al. (2019)

30.69

35.68

3.26

27.43

53.76

4.91

41.33

0.19

34.29

59.85

SY-13

 

45.31

29.62

3.77

41.54

39.53

5.03

55.44

0.19

39.29

62.92

SY-1

 

38.52

31.62

3.74

34.78

45.08

5.33

49.59

0.14

40.00

73.43

SY-4

 

22.76

40.62

2.59

20.18

64.08

4.09

31.83

0.19

33.43

59.23

SY-5

 

33.71

30.98

2.18

35.53

45.10

3.17

51.73

0.15

35.71

68.37

SY-7

 

35.94

31.98

4.52

31.42

47.08

6.65

46.26

0.19

38.00

62.50

SY-10

 

49.53

25.51

4.02

45.52

33.99

5.36

60.65

0.11

33.93

75.09

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