Table 2 Calculation results of horizontal ground stress.

From: Kaiser acoustic emission ground stress testing study on shale oil reservoir in Y block of Ordos basin, China

Well name

Core location

Core number

Kaiser Point stress value (MPa)

αPp

Vertical depth (m)

tan2β

(tan2β)^2

(1+(tan2β)^2)^(1/2)

Maximum ground stress (MPa)

Maximum ground stress gradient (MPa/100)

Minimum ground stress (MPa)

Minimum ground stress gradient (MPa/100)

α

Pp

0°

45°

90°

Y-1

2 (25/36)

1, 2, 3

46.42

39.35

45.21

17.06

2468.47

10.68595

114.18954

10.73264

69.37

2.810

56.38

2.284

0.601

28.39

Y-1

2 (11/36)

5, 6, 7

46.76

36.86

38.82

15.68

2465.23

1.49370

2.23115

1.79754

65.60

2.661

51.33

2.082

0.553

28.35

Y-2

2 (42/51)

8, 9, 10

45.37

36.52

40.35

16.71

2398.00

2.52590

6.38015

2.71664

66.39

2.769

52.75

2.200

0.606

27.58

Y-3

2 (20/44)

12, 13, 14

53.51

39.48

45.64

14.99

2387.00

2.56544

6.58147

2.75345

75.40

3.159

53.73

2.251

0.546

27.45

Y-3

2 (3/44)

32, 33, 34

50.57

40.01

45.64

15.24

2383.90

3.28398

10.78450

3.43286

71.81

3.012

54.89

2.302

0.556

27.41

Y-4

3 (49/88)

16, 17, 18

44.96

36.27

39.68

14.71

2343.00

2.29167

5.25174

2.50035

63.63

2.716

50.43

2.152

0.546

26.94

Y-4

3 (56/88)

20, 21, 22

42.21

33.69

35.39

14.10

2344.00

1.49853

2.24560

1.80156

59.04

2.519

46.75

1.995

0.523

26.96

Y-5

3 (16/28)

24, 25, 26

41.13

34.29

36.49

15.53

2262.37

1.94828

3.79578

2.18993

59.42

2.627

49.26

2.177

0.597

26.02

Y-5

3 (20/28)

28, 29, 30

46.07

34.03

39.17

15.39

2263.78

2.48986

6.19938

2.68317

67.26

2.971

48.75

2.153

0.591

26.03

Y-6

1 (9/60)

39, 40, 41

47.90

34.08

35.93

14.97

2358.10

1.30911

1.71376

1.64735

66.74

2.830

47.02

1.994

0.552

27.12

Y-8

3 (52/57)

36, 37, 38

42.47

34.15

40.76

16.10

2499.70

8.73099

76.23026

8.78807

65.23

2.609

50.20

2.008

0.560

28.75

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