A Review of the Hydrochemistry of a Deep Sedimentary Aquifer and Its Consequences for Geothermal Operation: Klaipeda, Lithuania

Table 5

Calculated saturation indices for the Klaipeda 2P brine sampled on 1/4/16, at 37°C and 11°C, using PHREEQC Interactive version 3.3.5 [29] and the Pitzer thermodynamic database.

Phase	SI (37°C)	SI (11°C)	Formula
Dolomite	0.58	0.04	CaMg(CO3)2
Calcite	0.35	0.11	CaCO3
Celestite	0.13	0.04	SrSO4
Aragonite	0.04	-0.1	CaCO3
Gypsum	0.01	0.06	CaSO4·2H2O
Barite	-0.08	0.27	BaSO4
Anhydrite	-0.15	-0.43	CaSO4
Quartz	-0.18	0.22	SiO2
Chalcedony	-0.57	-0.25	SiO2
Magnesite	-0.63	-0.68	MgCO3
Goergeyite	-1.25	0.5	K2Ca5(SO4)6H2O
SiO2 (amorphous)	-1.42	-1.18	SiO2
Halite	-1.71	-1.67	NaCl
Mirabilite	-2.92	-1.78	Na2SO4·10H2O
Sylvite	-3.05	-2.77	KCl
Thenardite	-3.1	-3.23	Na2SO4
Epsomite	-3.19	-2.91	MgSO4·7H2O
Brucite	-5.25	-6.26	Mg(OH)2