Table 2 Mineral composition in weight and volume percent of the studied samples.
Component | Density (g/cm3) | Niobrara | Wolfcamp | Bakken | Utica | ||||
|---|---|---|---|---|---|---|---|---|---|
wt.% | vol.% | wt.% | vol.% | wt.% | vol.% | wt.% | vol.% | ||
Quartz | 2.65 | 9.05 | 7.63 | 24.8 | 22.2 | 29.7 | 27.9 | 15.3 | 13.6 |
Orthoclase | 2.56 | / | / | / | / | 23.4 | 22.8 | / | / |
Anorthite | 2.73 | 3.02 | 2.55 | 2.99 | 2.60 | 2.89 | 2.63 | / | / |
Calcite | 2.71 | 73.4 | 75.5 | 45.8 | 50.1 | 1.71 | 1.97 | 51.5 | 56.0 |
Dolomite | 2.87 | 0.78 | 0.61 | / | / | 7.13 | 6.25 | / | / |
Gypsum | 2.36 | / | / | / | / | 2.71 | 2.85 | / | / |
Illite | 2.75 | 10.12 | 8.22 | 2.22 | 1.92 | / | / | / | / |
Chlorite | 2.65 | / | / | / | / | 6.86 | 6.44 | 8.87 | 6.56 |
Muscovite | 2.81 | / | / | 19.2 | 16.2 | 6.31 | 5.57 | 20.6 | 17.3 |
Marcasite | 4.89 | / | / | / | / | 3.79 | 1.93 | / | / |
Pyrite | 5.01 | 0.88 | 0.39 | 1.55 | 0.73 | 5.86 | 2.91 | / | / |
TOC | 1.30 | 2.88 | 5.10 | 3.40 | 6.21 | 9.79 | 18.8 | 3.60 | 6.54 |
