Table 1.
Summary of geochemistry results.
| Min | Max | Avg | SD | |
|---|---|---|---|---|
| PRODUCED WATER | ||||
| pH | 6.6 | 7.6 | 7.0 | 0.3 |
| T (°C) | 15.2 | 28.2 | 19.0 | 3.7 |
| Cond. (mS cm−1) | 46.4 | 79.6 | 60.9 | 10.2 |
| Alk.(meq L−1) | 3.3 | 8.5 | 4.9 | 1.5 |
| Cl− (M) | 0.6 | 1.6 | 1.0 | 0.3 |
| Br− (mM) | 0.9 | 3.7 | 1.8 | 0.8 |
| (μM) | 7 | 112 | 50 | 22 |
| Na+ (M) | 0.5 | 1.2 | 0.8 | 0.2 |
| K+ (mM) | 1.7 | 4.7 | 2.6 | 0.9 |
| Mg2+ (mM) | 14.2 | 78.7 | 36.0 | 19.0 |
| Ca2+ (mM) | 11.7 | 58.5 | 31.8 | 12.5 |
| Fe2+ (μM) | 2 | 1502 | 372 | 438 |
| NPOC (μM) | 109 | 2018 | 295 | 483 |
| TN (mM) | 0.8 | 2.1 | 1.3 | 0.4 |
| δD H2O* (‰) | −50.6 | −35.8 | −41.8 | 4.8 |
| δ18O H2O (‰) | −7.4 | −5.4 | −6.3 | 0.6 |
| GAS | ||||
| CH4 (mol %) | 95.3 | 98.5 | 97.3 | 0.1 |
| CO2 (mol %) | 0.5 | 1.7 | 1.0 | 0.4 |
| C2H6 (mol %) | 0.02 | 0.27 | 0.06 | 0.07 |
| C3H8 (mol %) | 0.0003 | 0.23 | 0.02 | 0.06 |
| δD CH4 (‰) | −228.2 | −217.2 | −222.2 | 2.9 |
| δ13C CH4 (‰) | −70.0 | −56.5 | −60.9 | 4.0 |
| δ13C CO2 (‰) | −5.4 | 9.2 | 4.3 | 3.9 |
*
Oxygen and hydrogen delta values are relative to VSMOW. Carbon delta values are relative to VPDB.