Table 1.
Well | Fracture history | Times fractured | pH | Alkalinity (meq.liter−1) | [Cl−] (M) | [Na+] (M) | CH4OH (mM) | [DNA] (ng L−1) |
---|---|---|---|---|---|---|---|---|
A3-11 | Slick water and foam fractured | 3 | 6.97 | 10.6 | 1.72 | 1.26 | 16 | 1500 |
B1-12 | Foam fractured | 1 | 6.56 | 12.5 | 1.51 | 1.13 | 0.1 | 4750 |
C1-12 | Foam fractured | 1 | 6.69 | 13 | 1.73 | 1.29 | 4 | 1000 |