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Table 1 Production water samples used for ahyA genes testing

From: New evidence for a hydroxylation pathway for anaerobic alkane degradation supported by analyses of functional genes and signature metabolites in oil reservoirs

Samples Shengli oil field Jiangsu oil field
Z3-13 Z3-24 Z3-25 H88-3 H88-21 H88-30
Temperature (°C) 63 63 63 80 80 80
pH 7.0 6.4 6.7 6.7 6.7 6.7
Na+ (mM) 166 65.14 170 210 224 229
Mg2+ (mM) 1.56 1.50 1.98 0.22 0.19 0.24
Ca2+ (mM) 1.80 2.11 2.25 0.05 0.05 0.03
NH4+ (mM) 2.90 11.26 1.61 1.19 1.56 1.47
K+ (mM) 0.33 0.53 0.53 16.17 13.66 15.22
Cl (mM) 106 129 109 134 144 136
NO3 (mM) ND 0.14 ND 0.32 0.34 0.31
SO42− (mM) 0.03 0.03 0.03 23.03 22.41 31.00
PO43− (mM) ND ND ND 16.64 ND ND
CO32− (mM) 17.96 8.05 14.83 0.40 0.51 0.51
Formate (mM) 0.54 ND 0.052 ND ND 0.01
Acetate (mM) ND ND 0.04 0.49 0.68 0.86
Propionate (mM) 0.05 ND ND ND ND ND
Butyrate (mM) 0.17 0.16 0.22 ND ND 0.02
  1. ND, not detected. The detection limit of formate and PO43− is 1×10−3 mM. The detection limit of acetate, propionate and butyrate is 2×10−3 mM