Research Article
Understanding of Long-Term CO2-Brine-Rock Geochemical Reactions Using Numerical Modeling and Natural Analogue Study
Table 1
Volume fractions of minerals in sandstone samples taken from the Longtan Formation (converted from XRD analysis data).
| Number | Well | Depth (m) | Quartz (%) | Illite (%) | Kaolinite (%) | Chlorite (%) | Smectite (%) | Plagioclase (%) | K-feldspar (%) | Calcite (%) | Ankerite (%) | Siderite (%) | Barite (%) |
| X1-1 | X1 | 1868.1 | 66.0 | 20.2 | 0.0 | 0.2 | 1.9 | 5.3 | 0 | 2.7 | 0 | 0 | 3.7 | X1-2 | X1 | 1877.5 | 57.8 | 19.5 | 0.0 | 0.9 | 1.8 | 13.7 | 0 | 2.7 | 0 | 0 | 3.6 | X1-3 | X1 | 1878.52 | 52.1 | 14.7 | 0.0 | 1.2 | 1.3 | 12.9 | 0 | 1.2 | 0 | 12.2 | 4.4 | X1-4 | X1 | 1970 | 48.0 | 22.2 | 1.4 | 3.0 | 0.7 | 9.1 | 0 | 5.7 | 0 | 5.7 | 4.2 | X1-5 | X1 | 1995 | 41.4 | 21.3 | 1.3 | 4.0 | 1.8 | 3.1 | 2.2 | 0 | 8.2 | 9.8 | 6.9 | X1-6 | X1 | 2056 | 48.5 | 14.8 | 0.7 | 1.8 | 0.5 | 16 | 2.3 | 6.5 | 1.7 | 4.2 | 3 | X2-1 | X2 | 1548.02 | 69.3 | 8.1 | 0.0 | 0.4 | 0.7 | 11.7 | 0 | 0 | 0 | 5.5 | 4.3 | X2-2 | X2 | 1552.53 | 52.8 | 19.4 | 0.0 | 0.4 | 1.1 | 13 | 0 | 3 | 0 | 6.5 | 3.8 | X2-3 | X2 | 1553.86 | 44.4 | 34.0 | 0.0 | 1.7 | 6.4 | 6.7 | 0 | 0 | 0 | 3.5 | 3.3 | X2-4 | X2 | 1557.15 | 50.4 | 28.0 | 0.0 | 0.0 | 2.1 | 11.6 | 0 | 1.7 | 0 | 3.1 | 3.1 | X2-5 | X2 | 1559.14 | 56.3 | 23.8 | 0.0 | 1.6 | 0.9 | 12.2 | 0 | 1.8 | 0 | 0 | 3.4 | X2-6 | X2 | 1629.68 | 62.5 | 9.8 | 0.0 | 1.7 | 0.8 | 19.1 | 0 | 2.5 | 0 | 0 | 3.6 | X2-7 | X2 | 1631.73 | 52.6 | 10.4 | 0.0 | 1.8 | 1.0 | 14.2 | 0 | 8.3 | 0 | 5.2 | 6.5 | X2-8 | X2 | 1636.75 | 69.3 | 7.3 | 0.0 | 1.7 | 0.3 | 11.7 | 0 | 0 | 0 | 5.5 | 4.2 | X3-1 | X3 | 1595 | 85.7 | 5.0 | 2.8 | 0.0 | 0.3 | 0 | 0 | 0 | 0 | 0 | 6.2 | X3-2 | X3 | 1597.1 | 88.6 | 2.2 | 1.7 | 0.0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 7.4 | X3-3 | X3 | 1598.3 | 86.9 | 3.2 | 2.8 | 0.0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 6.9 | X3-4 | X3 | 1598.5 | 89.1 | 3.2 | 2.3 | 0.0 | 0.2 | 0 | 0 | 0 | 0 | 0 | 5.2 |
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