Table 3 General characteristics of fluids inside reservoirs of geothermal power plants used for energy production

Temperature [°C]

73°–450 °C

(Zarrouk and Moon 2014; Khare et al. 2019)

Depth

300 m–5000 m

(Sanjuan et al. 2016; Moya et al. 2018)

Pressure [MPa]

Up to 48 Mpa

(Árpási, Lorberer and Pap 2000)

Cl⁻

Up to 160 g/L

(Leins et al. 2022)

TDS

95–280′000 mg/L

(Finster et al. 2015)

pH

0.9–11.8

(Finster et al. 2015)

Radioactivity

 > 200 pCi/L (equal to > 7.4 Bq/L)

(Finster et al. 2015)

DOC

Up to 25.9 mg C/L

(Leins et al. 2022)

Formate

Up to 40.4 mg/L

(Feldbusch 2015)

Acetate

Up to 47.6 mg/L

(Leins et al. 2022)

Propionate

Up to 2.64 mg/L

(Leins et al. 2022)