Supercritical Fluid Geochemistry in Geothermal Systems
Table 3
Chemical composition of the solutions from the SubC and SupC reactors. Concentrations are in ppm.
Run #
(°C)
pH
/
°C
SiO2
B
Na
K
Ca
Mg
Fe
Al
Cl
CO2
SO4
H2S
Subcritical
SubC-1-S1
260
8.08
/
21
535
3.46
165
21.1
0.70
0.023
0.029
6.88
45.4
82.3
98.0
44.0
SubC-1-S2
260
8.02
/
21
526
3.36
160
30.8
1.00
0.010
0.060
6.21
43.2
87.1
180
38.5
SubC-1-S3
260
8.21
/
21
548
3.44
165
22.5
0.69
0.003
0.023
6.69
43.6
83.2
138
57.9
SubC-1-S4
260
8.50
/
21
493
3.46
168
23.0
1.72
0.004
0.154
5.13
44.7
99.0
142
40.9
SubC-1-S5
260
8.70
/
21
440
3.41
173
22.0
2.71
0.003
0.028
4.86
44.0
94.2
124
40.6
SubC-1-S6
260
9.03
/
21
383
3.38
177
21.9
3.04
0.002
0.019
5.61
43.2
73.9
164
40.6
SubC-1-S7
260
9.18
/
21
356
3.35
186
21.3
2.90
0.000
0.032
6.50
44.0
78.3
173
36.1
SubC-1-S8
260
9.37
/
21
336
3.38
196
20.7
2.45
0.005
0.020
6.48
46.1
76.6
137
49.1
SubC-1-S9
260
9.79
/
21
327
3.36
200
19.5
2.43
0.000
0.017
6.61
44.7
70.9
158
36.1
SubC-1-S10
260
9.63
/
21
332
3.38
205
19.3
2.22
0.002
0.046
6.48
45.4
63.8
188
36.1
SubC-1-S11
260
9.64
/
21
325
3.36
207
18.6
2.14
0.007
0.036
6.15
45.4
65.1
164
37.8
SubC-1-S12
260
9.60
/
21
329
3.36
212
55.5
2.21
0.005
0.058
5.96
50.0
66.0
202
26.9
SubC-1-S13
260
8.09
/
21
634
3.48
167
21.5
1.47
0.054
0.079
8.04
44.7
55.5
154
30.7
SubC-1-S14
260
8.00
/
21
674
3.46
161
21.9
1.58
0.012
0.042
5.26
44.0
90.7
152
27.3
SubC-1-S15
260
8.40
/
21
559
3.46
171
22.4
1.44
0.005
0.012
6.23
44.3
67.3
207
17.4
SubC-1 inleta
260
8.82
/
21
453
3.41
181
24.1
1.91
0.009
0.044
6.21
44.8
76.9
159
37.3
Krafla w17b
275d
9.30
/
21
699
1.49
144
24.0
0.35
0.012
0.025
1.94
24.6
49.1
79.6
53.5
Krafla w37c
265e
7.95
/
20
488
3.46
156
22.8
7.61
0.012
0.018
0.84
46.1
106
90.8
40.9
Supercritical
SupC-1-S17
420
5.06
/
21
5.3
3.19
0.2
0.07
0.06
0.002
0.050
0.022
0.35
8.32
0.45
13.9
SupC-1-S18
420
4.96
/
21
3.6
4.16
0.1
0.06
0.09
0.005
0.069
0.062
19.8
0.49
17.2
SupC-1-S19
420
4.75
/
21
2.3
3.30
0.1
0.02
0.02
0.002
0.042
0.027
0.46
24.5
0.32
8.18
SupC-1-S20
420
4.90
/
21
2.1
3.35
0.1
0.02
0.02
0.002
0.026
0.018
0.37
15.7
0.27
10.5
SupC-1-S21
420
4.50
/
21
1.5
2.58
0.2
0.04
0.02
0.003
0.024
0.044
0.48
268
0.40
12.0
SupC-1-S22
420
5.00
/
21
1.4
3.47
0.2
0.05
0.05
0.003
0.029
0.029
0.46
25.1
0.38
7.56
SupC-1-S23
420
4.40
/
21
1.4
3.42
0.1
<0.1
0.03
0.004
0.039
0.081
225
0.35
28.0
SupC-1-S24
420
4.60
/
21
1.3
2.92
0.1
0.04
0.02
0.003
0.037
0.064
0.36
105
0.33
13.9
SupC-2-SSE1
400
3.99
/
22
4.6
1.30
0.5
<0.1
0.12
0.029
0.208
0.173
1.89
46.5
0.26
13.8
SupC-2-SSE2
400
4.17
/
22
4.3
1.43
1.6
0.25
0.15
0.041
0.181
0.060
2.13
35.4
0.78
10.7
SupC-2-SSE3
400
3.97
/
22
3.1
1.47
1.1
0.26
0.08
0.019
0.099
0.075
1.90
38.0
0.67
40.0
SupC-2-SS34
400
3.68
/
22
2.9
1.32
1.5
0.19
0.06
0.021
0.083
0.059
2.85
59.6
0.54
29.9
SupC-2-SSE5
400
3.24
/
21
2.8
1.37
0.4
<0.1
0.11
0.019
0.058
0.041
2.05
55.3
0.36
24.9
SupC-2-SSE6
400
3.65
/
21
1.2
1.38
1.0
<0.1
0.17
0.028
0.102
0.071
1.41
53.7
1.74
25.1
SupC-2-SSE7
400
3.41
/
21
1.4
1.44
0.8
<0.1
0.04
0.023
0.080
0.056
1.75
135
1.50
31.2
aThe average inlet composition of subcritical experiments SubC-1-n that served as inlet solution for supercritical experiment SupC-1-n. bKrafla w17 was used as an inlet for subcritical experiments SubC-1-n. Note: the inlet solution represents the liquid phase only discharge from the well w17. cThe Krafla w37 was used as inlet for the supercritical experiments SupC-2-n. Note: the inlet solution represents the liquid phase only discharge from the well w37. dBased on Gudmundsson and Arnórsson [41]. eBased on Ntihabose [63].
