Kerogen types: comparison of maturity measures
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Parameter differences
The table below shows examples of the relationships between hydrocarbon generation zones, maturity, and transformation ratio for standard types II and III kerogens, based on a specific burial and thermal history model. The most significant difference is in the depth to the onset of oil generation, where depth::1000 m separates the top of the oil windows of these two kerogen types.
Hydrocarbon generation zone | Vitrinite refl., % Ro, Type II | Vitrinite refl., % Ro, Type III | Transformation ratio, %, Type II | Transformation ratio, %, Type III | Present-day depth, m, Type II | Present-day depth, m, Type III |
---|---|---|---|---|---|---|
Onset oil | 0.55 | 0.85 | 5 | 12 | 2200 | 3200 |
Onset peak rate generation | 0.65 | 1.00 | 17 | 31 | 2600 | 3500 |
Onset gas/cracking liquids | 0.95 | 1.35 | 88 | 64 | 3400 | 4050 |