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Table 3 Existing gas geothermometers reported in the geothermal literature which were used in the present work

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

No. Acronym Temperature function (°C) Gas concentration units References
1 DP80 If %CO2 ≥ 75
\(\frac{24775}{{2log\left( {\frac{{CH_{4} }}{{CO_{2} }}} \right) - 6log\left( {\frac{{H_{2} }}{{CO_{2} }}} \right) - 3log\left( {\frac{{H_{2} S}}{{CO_{2} }}} \right) + 36.05}} - 273.15\)
If %CO2 < 75
\(\frac{24775}{{2log\left( {\frac{{CH_{4} }}{{CO_{2} }}} \right) - 6log\left( {\frac{{H_{2} }}{{CO_{2} }}} \right) - 3log\left( {\frac{{H_{2} S}}{{CO_{2} }}} \right) - 7log\left( {0.1} \right) + 36.05}} - 273.15\)
% volume D’Amore and Panichi (1980)
2 ND84a \(\frac{{\sqrt{{\left( {5.5697 - R} \right) + \left( {R - 5.5697} \right)^{2} + 1056.34368}}}}{0.03936} - 273.15\)
\(R = log\left( {X_{{CH_{4} }} } \right) - 4log\left( {X_{{H_{2} }} } \right) - log\left( {X_{{CO_{2} }} } \right)\)
Mole fraction Nehring and D’Amore (1984)
3 ND84b \(\frac{{\sqrt{{\left( {S + 1.89499} \right) + \left( {S + 1.89499} \right)^{2} + 128.90864}}}}{0.01432} - 273.15\)
\(S = log\left( {X_{{H_{2} }} } \right) + \frac{1}{2}log\left( {X_{{CO_{2} }} } \right)\)
Mole fraction Nehring and D’Amore (1984)
4 ND84c \(5.78356V^{2} + 110.212V + 662.814\)
\(V = log\left( {X_{{H_{2} S}} } \right) + \frac{1}{6}log\left( {X_{{CO_{2} }} } \right)\)
Mole fraction Nehring and D’Amore (1984)
5 AG85a \(- 44.1 + 269.25\left[ {log\left( {CO_{2} } \right)} \right] - 76.88\left[ {log\left( {CO_{2} } \right)} \right]^{2} + 9.52\left[ {log\left( {CO_{2} } \right)} \right]^{3}\) mmol/kg Arnórsson and Gunnlaugsson (1985)
6 AG85b \(341.7 - 28.57log\left( {\frac{{CO_{2} }}{{H_{2} }}} \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
7 AG85c \(311.7 - 66.72log\left( {\frac{{CO_{2} }}{{H_{2} }}} \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
8 AG85d \(277.2 + 20.99log\left( {H_{2} } \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
9 AG85e \(212.2 + 38.59log\left( {H_{2} } \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
10 AG85f \(246.7 + 44log\left( {H_{2} S} \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
11 AG85g \(173.2 + 65.04log\left( {H_{2} S} \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
12 AG85h \(304.1 - 39.48log\left( {\frac{{H_{2} S}}{{H_{2} }}} \right)\) mmol/kg Arnórsson and Gunnlaugsson (1985)
13 A87a \(148.5 + 64.35log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right) + 5.239\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{2} - 1.832\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{3}\) mmol/kg Arnórsson (1987)
14 A87b \(135.9 + 63.14log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right) + 6.241\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{2} - 1.813\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{3}\) mmol/kg Arnórsson (1987)
15 G91a \(\frac{4625}{{10.4 + log\left( {\frac{{CH_{4} }}{{CO_{2} }}} \right)}} - 273.15\) mmol/mol Giggenbach (1991)
16 K95a \(352.45 - 53.36log\left( {\frac{{CO_{2} }}{{H_{2} }}} \right)\) % volume Koga et al. (1995)
17 K95b \(228.95 - 24.06\left( {\frac{{CH_{4} }}{{H_{2} }}} \right)\) % volume Koga et al. (1995)
18 S96a \(\frac{738.3091}{{\left( {\% gas^{0.0008} } \right)\left( {\frac{{\% CO_{2} }}{{\% H_{2} S}}} \right)^{0.1037} }} - 273.15\) % volume Supranto et al. (1996)
19 S96b \(\frac{{1138.9501\left( {\% Gas} \right)^{0.0037} \left( {\% H_{2} S} \right)^{0.1076} }}{{\left( {\% CO_{2}^{0.2019} } \right)\left( {\% CH_{4} } \right)^{0.0056} }} - 273.15\) % volume Supranto et al. (1996)
20 A98a \(121.8 + 72.012log\left( {CO_{2} } \right) + 11.068\left[ {log\left( {CO_{2} } \right)} \right]^{2} - 4.724\left[ {log\left( {CO_{2} } \right)} \right]^{3}\) mmol/kg Arnórsson et al. (1998)
21 A98b \(129.2 + 88.299\log \left( {CO_{2} } \right) + 21.946\left[ {\log \left( {CO_{2} } \right)} \right]^{2} - 10.103\left[ {log\left( {CO_{2} } \right)} \right]^{3}\) mmol/kg Arnórsson et al. (1998)
22 A98c \(177.6 + 66.152log\left( {H_{2} S} \right) + 4.811\left[ {log\left( {H_{2} S} \right)} \right]^{2}\) mmol/kg Arnórsson et al. (1998)
23 A98d \(227.1 + 56.168log\left( {H_{2} } \right) + 5.836\left[ {log\left( {H_{2} } \right)} \right]^{2} + 6.630\left[ {log\left( {H_{2} } \right)} \right]^{3}\) mmol/kg Arnórsson et al. (1998)
24 A98e \(173.2 + 48.751log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right) + 7.599\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{2} + 1.793\left[ {log\left( {\frac{{CO_{2} }}{{N_{2} }}} \right)} \right]^{3}\) mmol/kg Arnórsson et al. (1998)
25 B06 For H2S concentrations ≥ 0.00175 \(75.85log\left( {H_{2} S} \right) + 458.6\)
For H2S concentrations < 0.00175
\(64.68log\left( {H_{2} S} \right) + 427.8\)
%mol Blamey (2006)
  1. All the gas geothermometers use concentration units in wet-basis, except DP80, G91a, S96a, S96b, and B06 which use dry-basis