Research Article
Origin and Role of Kaolinization in Roll-Front Uranium Deposits and Its Response to Ore-Forming Fluids in the Yili Basin, China
Table 3
Gas hydrocarbon composition in host rocks within the Mengqiguer uranium deposit.
| Samples | Distance from underlying coal seam (m) | Rocks | C1 (μl/kg) | C2 (μl/kg) | C3 (μl/kg) | nC4 (μl/kg) | iC4 (μl/kg) | nC5 (μl/kg) | iC5 (μl/kg) | C1/ | C1/∑C |
| P-1 | 12 | Coarse-grained sandstone | 910.20 | 35.34 | 10.72 | 0.78 | 3.63 | 0.37 | 1.00 | 17.56 | 0.95 | P-2 | 13 | Coarse-grained sandstone | 908.40 | 30.34 | 15.56 | 0.83 | 1.05 | 0.23 | 0.76 | 18.63 | 0.95 | P-3 | 21 | Conglomerate | 675.21 | 18.61 | 10.01 | 0.33 | 1.56 | 0.17 | 0.44 | 21.70 | 0.96 | P-4 | 29 | Medium-grained sandstone | 364.33 | 12.81 | 5.52 | 0.46 | 2.11 | 0.29 | 0.65 | 16.68 | 0.94 | P-5 | 35 | Sandy conglomerate | 200.30 | 9.81 | 4.70 | 0.39 | 1.56 | 0.19 | 0.45 | 11.71 | 0.92 | P-6 | 44 | Fine-grained sandstone | 194.32 | 6.82 | 4.10 | 0.37 | 1.41 | 0.20 | 0.44 | 14.57 | 0.94 | P-7 | 49 | Medium-grained sandstone | 88.80 | 2.51 | 1.01 | 0.09 | 0.34 | <0.05 | 0.09 | 21.98 | 0.96 |
|
|
C 1, methane; C 2, ethane; C 3, propane; nC 4, n-butane; iC 4, isobutene; nC 5, n-pentane; iC 5, isopentane; = C 2 + C 3 + nC 4 + iC 4 + nC 5 + iC 5; ∑C = C 1 + C 2 + C 3 + nC 4 + iC 4 + nC 5 + iC 5. |