All issues Volume 76 (2021) Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 76 (2021) 1 Full HTMLGeochemical characterization of zones and the ratios cut offs used to define the zone boundaries.
| Zone | Comments | Sr/Ca | Zr/Th | Si/Zr | Si/K |
|---|---|---|---|---|---|
| C1 | Lower Ca than in C2 | >0.22 | >19 | ||
| C2 | Higher Mn and Ca than C1 and R | >1.1 | <5.5 | <0.22 | <19 |
| R | Higher Si than in C2 | <1.1 | >5.5 | >0.22 | >19 |
| Sr/Ca minima, Al low to undetectable | <11 | ||||
| Generally lower trace elements (Rb, Sr, Cu) than in C2 and C3 | |||||
| C3 | Higher Si than in R and C2 | >1.1 | >11 | <0.22 | >19 |
| Highest Al than in C1, C2 and R | |||||
| Lower Ca than in R and C2 |
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