TABLE 1.
Chemical composition of produced water and injection water samples.
| Compound/elementa | LODb | Produced water | Injection water | |||||
| Stations | CPF | Tank | ||||||
| PW1 | PW2 | PW3 | PW4 | PW5 | PW6 | IW | ||
| pH | – | 6.75 | 6.95 | 7.34 | 7.18 | 7.03 | 7.02 | 6.92 |
| Conductivity (mS/cm) | – | 60.1 | 60.3 | 68.3 | 65.7 | 65.2 | 59.2 | 48.0 |
| TPHc C6-9 (mg/L) | 0.02 | 2.2 | 0.64 | 1.1 | 2.3 | 44 | 4.4 | <0.02 |
| TPH C10-14 (mg/L) | 0.02 | 27 | 8.7 | 10 | 25 | 210 | 43 | 0.74 |
| TPH C15-28 (mg/L) | 0.04 | 31 | 9.4 | 9.5 | 31 | 200 | 44 | 0.17 |
| TPH C29-36 (mg/L) | 0.04 | 1.7 | 0.28 | 0.19 | 3.0 | 20 | 2.6 | <0.04 |
| TPH C > 36 (mg/L) | 0.04 | 0.29 | 0.08 | <0.04 | 0.30 | 5.4 | 0.34 | <0.04 |
| Calcium (mg/L) | 0.1 | 390 | 530 | 570 | 610 | 750 | 490 | 500 |
| Iron (mg/L) | 0.01 | 10 | 11 | 4.0 | 3.7 | 12 | 4.9 | 0.55 |
| Potassium (mg/L) | 0.1 | 190 | 370 | 170 | 160 | 170 | 170 | 310 |
| Magnesium (mg/L) | 0.1 | 190 | 270 | 370 | 310 | 370 | 240 | 140 |
| Manganese (mg/L) | 0.01 | 0.16 | 0.15 | 0.06 | 0.08 | 0.15 | 0.07 | 0.07 |
| Sodium (mg/L) | 0.1 | 13,000 | 13,000 | 15,000 | 14,000 | 14,000 | 14,000 | 9,800 |
| Zinc (mg/L) | 0.01 | 0.16 | 1.7 | <0.01 | 0.30 | 0.04 | <0.01 | 0.07 |
| Ammonia-N (mg/L) | 0.02 | 45 | 42 | 52 | 47 | 47 | 43 | 41 |
| Chloride (mg/L) | 5 | 22,000 | 23,000 | 28,000 | 27,000 | 26,000 | 25,000 | 20,000 |
| Sulfate (mg/L) | 1 | <1 | 2 | <1 | <1 | <1 | <1 | <1 |
| Alkalinity (mg CaCO3/L) | 5 | 720 | 520 | 610 | 410 | 450 | 540 | 580 |
| Salinity (mg/L) | 10 | 37,000 | 39,000 | 44,000 | 42,000 | 42,000 | 38,000 | 31,000 |
| Acetic Acid (mg/L) | 1 | 66 | 39 | 69 | 29 | 67 | 33 | <1 |
| Propionic Acid (mg/L) | 2 | 29 | 24 | 60 | 53 | 36 | 28 | <2 |
| TOCd (mg/L) | 1 | 96 | 64 | 100 | 73 | 97 | 56 | < 1 |
| Total Nitrogen (mg/L) | 0.2 | 45 | 42 | 52 | 47 | 47 | 43 | 41 |
| Total Phosphorus (mg/L) | 0.01 | 0.11 | 0.38 | 0.12 | 0.25 | 0.06 | 0.15 | 0.10 |
aChromium, Copper, Nickel, Sulfur, NOx-N, Nitrate-N, Nitrite-N, and thiosulphate were not detected in any of the samples. bLOR, Limit of Detection. cTPH, Total Petroleum Hydrocarbons. dTOC, Total Organic Carbon.