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Table 10 Summary of statistical results obtained from the geochemometric evaluation study of gas geothermometers

From: GaS_GeoT: A computer program for an effective use of newly improved gas geothermometers in predicting reliable geothermal reservoir temperatures

Evaluation metrics

Geothermal reservoir-typea

Gas Geothermometers (new and existingb); NWGDB nw = 265 data (LIQDR: g1 = 178; VAPDR: g2 = 87)

Percent difference

 

GasG1

GasG2

GasG3

GasG4

GasG5

GasG6

GasG7

GasG8

ND84c

AG85b

AG85d

AG85f

Number of Samples (%—applicability)

Over-estimation (DIFF% ≤ 20%)

LIQDR

103(60)

111(63)

99(58)

105(63)

93(55)

101(58)

97(58)

101(58)

70(39)

57(32)

55(31)

67(38)

VAPDR

38(44)

42(52)

43(50)

37(48)

47(54)

51(59)

48(57)

42(48)

27(31)

62(71)

67(77)

69(79)

Under-estimation (DIFF% ≤ 20%)

LIQDR

56(32)

56(32)

52(30)

50(30)

57(34)

54(31)

53(31)

56(32)

94(53)

104(58)

117(66)

88(49)

VAPDR

43(49)

32(39)

38(44)

36(47)

34(39)

29(34)

30(35)

39(45)

53(61)

20(23)

16(18)

13(15)

Equal to BHT (DIFF% ≤ 1%)

LIQDR

14(8)

8(5)

20(12)

11(7)

19(11)

19(11)

19(11)

18(10)

14(8)

17(10)

6(3)

23(13)

VAPDR

6(7)

7(9)

5(6)

4(5)

6(7)

6(7)

7(8)

6(7)

7(8)

5(6)

4(5)

5(6)

Rankingc

 

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

DIFF% (± 20%)d

LIQDR

GasG8

GasG3

GasG1

GasG7

GasG4

GasG2

GasG5

GasG6

AG85d

AG85b

ND84c

AG85f

168(96)

164(96)

164(95)

160(95)

157(95)

163(93)

156(92)

159(91)

156(88)

154(87)

152(85)

152(85)

VAPDR

A98c

GasG3

GasG5

GasG1

ND84c

GasG2

GasG4

GasG8

ND84b

GasG6

AG85f

GasG7

74(85)

73(85)

73(84)

71(82)

71(82)

66(82)

62(81)

70(81)

70(81)

69(80)

69(79)

66(78)

RMSE (°C)

LIQDR

GasG3

GasG8

GasG5

GasG6

GasG7

GasG1

GasG2

GasG4

AG85b

AG85d

AG85f

ND84c

31.6

31.8

32.6

33.2

33.4

33.5

33.9

34.7

36.9

38.7

38.8

45.2

VAPDR

GasG3

GasG1

ND84c

A98c

GasG2

ND84b

AG85f

GasG6

GasG8

GasG7

GasG5

GasG4

35.6

38.0

38.9

39.8

39.8

40.1

41.0

41.9

42.1

43.4

44.8

49.0

MAE (°C)

LIQDR

GasG8

GasG5

GasG3

GasG7

GasG4

GasG1

GasG6

GasG2

AG85f

AG85b

AG85d

ND84c

25.2

25.2

25.3

25.8

26.3

26.5

26.6

27.3

27.7

28.3

30.6

33.9

VAPDR

GasG3

GasG1

GasG2

GasG6

GasG5

A98c

GasG8

ND84c

ND84b

GasG7

AG85f

GasG4

27.6

29.3

30.2

30.4

31.3

31

32.1

32.7

33.8

33.8

34.0

39.2

MAPE (%)

LIQDR

GasG5

GasG3

GasG8

GasG7

GasG4

GasG1

GasG6

GasG2

AG85b

AG85f

AG85d

ND84c

9.1

9.1

9.1

9.3

9.4

9.5

9.6

9.8

10.0

10.6

11.3

12.6

VAPDR

GasG3

GasG1

GasG2

GasG6

GasG5

A98c

GasG8

ND84c

GasG7

AG85g

ND84b

GasG4

10.6

11.2

11.5

11.8

11.9

11.9

12.4

12.7

12.8

12.9

13.1

15.4

Theil's U test

LIQDR

GasG3

GasG8

GasG5

GasG7

GasG6

GasG1

GasG4

GasG2

AG85b

AG85d

AG85f

ND84c

VAPDR

GasG3

GasG1

ND84c

A98c

ND84b

AG85f

GasG2

GasG6

GasG8

GasG7

GasG5

GasG4

  1. aType of geothermal reservoir used to calibrate the gas geothermometers
  2. bFor the existing gas geothermometers (literature), we have selected only the best four geothermometers
  3. cThe full ranking can be checked in the Additional file 1: Tables S8 to S13
  4. dWithin the limits of acceptance. The new gas geothermometers were typed in italic font