Mathematical model of rock shaliness.
The shales contain much higher concentration of radioactive minerals comparing to clean sands and carbonates (see Table 1 below).
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| Table 1. GR values for popular minerals | ||||
| Rock Type | GR, API | ||
| 1 | Halite (NaCl) | 0 | ||
| 2 | Coal | 0 | ||
| 3 | Limestone | 5 – 10 | ||
| 4 | Sandstone | 10 – 20 | ||
| 5 | Dolomite | 10 – 20 | ||
| 6 | Shale | 80 – 140 | ||
| 7 | Mica | 100 – 170 | ||
| 8 | Silvite (KCl) | 500 | ||
| Fig. 1. Shale Volume Models. | ||||
See also
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References
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