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{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Critical elements of the petroleum system
| chapter = Evaluating source rocks
| frompg = 6-1
| topg = 6-41
| author = Carol A. Law
| link = http://archives.datapages.com/data/specpubs/beaumont/ch06/ch06.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
==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.

{| class = "wikitable"
|-
! Hydrocarbon generation zone
! Vitrinite reflectance, % Ro
! Transformation ratio, %
! Present-day depth, m
! Type II
! Type III
! Type II
! Type III
! Type II
! 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
|}

==See also==
* [[Relationships between maturity and hydrocarbon generation]]
* [[Kerogen type and hydrocarbon generation]]
* [[Kerogen type and maturity]]
* [[Kerogen type and transformation ratio]]
* [[Open-vs. Closed-system generation modeling]]

==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch06/ch06.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]

[[Category:Critical elements of the petroleum system]]
[[Category:Evaluating source rocks]]

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