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

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Kerogen types: comparison of maturity measures