Supercritical Fluid Geochemistry in Geothermal Systems

Table 5

Comparison of measured and modeled geothermal fluids at Krafla. Concentrations are in ppm.

	Subcritical fluid		Supercritical fluid
	Experiment^a	Krafla^b	Experiment w37^a	Experiment w17^a	IDDP-1^c	Model^c
(°C)	260	295	420	400	440
SiO2		659			6.0	3.2
B		1.23			1.41	1.39
Na		178			0.51	168
K		40.9			0.12	31.8
Ca		1.18			0.16	0.0002
Mg		0.001			0.024	0.000001
Fe		0.036			5.25	0.004
Al		1.27			0.054	0.001
Cl		112			105	109
CO2		858			1637	1628
SO4		127			32.7	4.13
H2S		266			630	395

^aAn average from the experimental runs (Table 3). ^bFrom Kaasalainen and Stefánsson [64]. ^cFrom Heřmanská et al. [31].