Table 3.
Sequence of solutions exposed to each of four separately and freshly prepared calcite samples (solution compositions are listed in Tables 1 and 2). Derived structural parameters describing the calcite–fluid interface for brines, petroleum oil, and synthetic oil mixtures, along with the quality of fit for each measurement.
| Sample # | Fluid | <|∆zCa|> | <|∆zCO3|> | <|∆θCO3|> | Oads | σint | χ2 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Å | w/r to HSW | Å | w/r to HSW | Deg (°) | w/r to HSW | WEq | w/r to HSW | Å | |||
| 1 | High salinity water (HSW) | 0.04 | – | 0.07 | – | 4.7 | – | 2.3 | – | 1.5 | 6.6 |
| 2 | Petroleum | 0.57 | 15.9 | 0.31 | 4.7 | 14.2 | 3.0 | 10.9 | 4.7 | 7.3 | 2.1 |
| HSW | 0.09 | 2.5 | 0.27 | 4.1 | 9.6 | 2.1 | 8.5 | 3.7 | 4.8 | 1.6 | |
| 3 | Formation water (FW) | 0.07 | 1.9 | 0.08 | 1.2 | 10.4 | 2.2 | 2.3 | 1.0 | 1.0 | 6.6 |
| Petroleum | 0.32 | 8.9 | 0.19 | 2.9 | 23.9 | 5.1 | 5.2 | 2.3 | 7.0 | 2.1 | |
| Low salinity water (LSW) | 0.11 | 3.0 | 0.12 | 1.8 | 13.3 | 2.8 | 5.6 | 2.5 | 5.9 | 1.6 | |
| 4 | Dodecane | 0.08 | 2.2 | 0.13 | 1.9 | 6.1 | 1.3 | 3.4 | 1.5 | 0.0 | 1.9 |
| Synthetic oil mixture | 0.05 | 1.4 | 0.17 | 2.6 | 5.0 | 1.1 | 2.8 | 1.2 | 0.0 | 2.3 | |
| Dodecane | 0.08 | 2.1 | 0.09 | 1.4 | 4.7 | 1.0 | 3.3 | 1.5 | 2.3 | 1.2 | |
| Petroleum | 0.59 | 16.5 | 0.24 | 3.6 | 21.7 | 4.7 | 8.8 | 3.8 | 6.3 | 1.0 | |
| Synthetic oil mixture | 0.30 | 8.2 | 0.16 | 2.4 | 31.3 | 6.7 | 6.8 | 3.0 | 5.0 | 3.2 | |
The columns labeled “w/r to HSW” show the ratio of the derived parameter value with respect to that observed in HSW.