Geofluids / 2019 / Article / Tab 3

Research Article

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

Table 3

Chemical composition of groundwater from Klaipeda Geothermal Demonstration Plant, showing analysis on a sample collected 5/10/2012 [17], three samples collected and analysed by GFZ-Potsdam in March-July 2016 from well 2P, and a sample collected on 5/4/17, from bulk water storage, and analysed by Glasgow University/SUERC. The final column shows standard sea water as reported by [18, 19]. An analysis of water from 2P in 2010 [9] reported concentrations of 3.2 μg/L As and 0.06 μg/L U. Additional analyses are available in GTN reports [16].

Gerber et al.2P wellhead2P filter2PGlasgow 2P stored waterSeawater
Sample date5/10/1231/3/161/4/1619/7/20165/4/17

Field parameters
 pH6.556.396.11
 ECμS/cm125,300123,300112,300
 Temperature°C36.436.437.233.6
 ORPmV-110-133-106-88
 Dissolved O2mg/L0.850.900.45

Laboratory analysis
 Total dissolved solidsmg/L88,52334,483
 Total organic carbonmg/L12
Major cations
 Na2+mg/L23,40024,29924,34924,70027,75510,556
 K+mg/L557616617656820380
 Ca2+mg/L63667558752276357990400
 Mg2+mg/L217523752364239924501262
 NH4+mg/L<100.05

Major anions
 HCO3-mg/L8485.479.397.648.8140
 Cl-mg/L53,90756,49856,83565,68680,91518,980
 NO3-mg/L (as NO3-)<1.6<0.6<0.6
 SO42-mg/L160617331778210615552649

Minor elements
 F-mg/L0.380.360.361.4
 Br-mg/L34635633345226065

 Fe2+mg/L171721
 Mn2+mg/L0.861.01.01.1
 Li+mg/L3.33.43.23.60.17
 B3+mg/L11.09.38.7104.6
 Si4+mg/L6.64.74.44.94
 Sr2+mg/L14316516616913
 Ba2+mg/L0.160.190.180.190.05

 Cl/Br mass ratio156159171145311292
 Li/Cl mass ratio6.14-056.02-055.63-055.48-058.96-06

 Mg/Sr mass ratio1514141497

 B/Cl mass ratio0.000200.000160.000150.000150.00024

δ18O‰ SMOW-4.46-4.5
δ2H‰ SMOW-34.7-26
14Cpmc<0.5
39Ar% modern<14
δ34SO4+18.9

Based on a cited total inorganic carbon (TIC) of 16.6 mg/L [17]. As some of the TIC may be carbonic acid, the figure of 84 mg/L may be somewhat overestimated.

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