Table 2.
Chemical and isotopic data for produced water samples.
| Well Number | PC | SB1 | SB2 | K1 | K2 | K3 | SR1a | I1 | I2 |
|---|---|---|---|---|---|---|---|---|---|
| Statusb | − | NS | NS | NS | NS | S | NS | NS | S |
| Sulfidec (mg/L) | − | − | − | − | 17.5 | 130 | − | 14−28 | 200 |
| DIC (mM) | 2.2 | 47.3 | 30.1 | 32.5 | − | − | 3.3 | − | − |
| DIC δ13C (‰) | 28.5 | 15.4 | 13.8 | −2.6 | − | − | 5.8 | − | − |
| Oil δ13C (‰) | − | −29.8 | −30.0 | −30.3 | −30.5 | − | −31.3 | − | − |
| CH4 (% headspace) | 1.4 | 0.8 | 1.2 | 1.3 | − | − | 1.1 | − | − |
| CH4 δ13C (‰) | −56.5 | −48.0 | −49.7 | −44.0 | − | − | −44.1 | − | − |
| CH4 δD (‰) | −259 | −267 | −281 | −178 | − | − | −197 | − | − |
| Ethane (ppmv) | 90 | 933 | 1737 | 2746 | − | − | 3562 | − | − |
| Ethane δ13C (‰) | − | −25.8 | −28.0 | −30.3 | − | − | −33.8 | − | − |
| Propane (ppmv) | nd | 1200 | 1996 | 1432 | − | − | 4622 | − | − |
| Propane δ13C (‰) | − | −26.1 | −26.7 | −29.7 | − | − | −33.3 | − | − |
| Butane (ppmv) | nd | 453 | 494 | 359 | − | − | 1844 | − | − |
| n−Butane δ13C (‰) | − | −27.5 | −28.5 | −30.7 | − | − | −33.1 | − | − |
| Isopentane δ13C (‰) | nd | −27.1 | −28.5 | −31.2 | − | − | −32.0 | − | − |
| Water δD (‰) | −159 | −125 | −125 | −106 | −139 | −44 | −157 | −38 | −38 |
| Water δ18O (‰) | −21.0 | −15.0 | −15.3 | −11.8 | −18.3 | 0.0 | −20.5 | 4.0 | −0.8 |
| Cl (mg/L) | 2444 | 8170 | 7050 | 9366 | 2092 | 11,629 | 2930 | 11,500 | 13,118 |
| SO4 (mg/L) | 1.4 | nd | nd | 4.2 | 4.5 | 11.5 | 1.8 | 76 | 611 |
| δ34S (‰) | bd | bd | bd | bd | bd | bd | bd | bd | 30.1 |
−, not available; nd, not detected; bd, below detection.
a
Influenced by PC water used for artificial lift.
b
NS, non-soured; S, soured as determined by field operators based on historical data.
c
Last sulfide measurement available (test separator, gas composition, H2S, ASTM D4810-88 (2012–2013).