AMB Express

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
Samples	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

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

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