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Kerogen type and maturity (view source)
Revision as of 13:55, 24 January 2014
, 13:55, 24 January 2014Initial import
{{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
}}
Each kerogen type has its own relationship to maturity parameters. Maturity measurements are made on materials other than kerogen; therefore, they are not a direct measure of the hydrocarbon generation stage of the source intervals. A relationship must be established between maturity of the geologic section and hydrocarbon generation for each kerogen type in a basin. This relationship can be derived using 1-D basin [[modeling]] techniques.
==Hydrocarbon generation and maturity==
The hydrocarbon generation-depth curve shown below indicates where various phases of hydrocarbons would be generated today in the geologic section if a uniform kerogen existed throughout. We would use the following steps to compare the relationships.
{| class = "wikitable"
|-
! Step
! Action
|-
| 1
| Define the hydrocarbon generation stage for a calibrated well based on the depth vs. hydrocarbon yield plot (left figure). For example, the onset of oil generation occurs at approximately [[length::2.1 km]]. Then transfer to the depth versus maturity plot (in this case vitrinite reflectance, right figure) and follow across at [[length::2.1 km]] until you reach the maturity profile. This vitrinite reflectance value (0.55 %R<sub>o</sub> ) would indicate the onset of hydrocarbon generation in this well.
|-
| 2
| Apply this relationship to predict the generation zones for this specific kerogen in wells with similar thermal and burial histories in the basin for which maturity data are available.
|}
[[file:evaluating-source-rocks_fig6-17.png|thumb|{{figure number|6-17}}. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]]
==See also==
* [[Relationships between maturity and hydrocarbon generation]]
* [[Kerogen type and hydrocarbon generation]]
* [[Kerogen type and transformation ratio]]
* [[Comparison of kerogen types]]
* [[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]]
| 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
}}
Each kerogen type has its own relationship to maturity parameters. Maturity measurements are made on materials other than kerogen; therefore, they are not a direct measure of the hydrocarbon generation stage of the source intervals. A relationship must be established between maturity of the geologic section and hydrocarbon generation for each kerogen type in a basin. This relationship can be derived using 1-D basin [[modeling]] techniques.
==Hydrocarbon generation and maturity==
The hydrocarbon generation-depth curve shown below indicates where various phases of hydrocarbons would be generated today in the geologic section if a uniform kerogen existed throughout. We would use the following steps to compare the relationships.
{| class = "wikitable"
|-
! Step
! Action
|-
| 1
| Define the hydrocarbon generation stage for a calibrated well based on the depth vs. hydrocarbon yield plot (left figure). For example, the onset of oil generation occurs at approximately [[length::2.1 km]]. Then transfer to the depth versus maturity plot (in this case vitrinite reflectance, right figure) and follow across at [[length::2.1 km]] until you reach the maturity profile. This vitrinite reflectance value (0.55 %R<sub>o</sub> ) would indicate the onset of hydrocarbon generation in this well.
|-
| 2
| Apply this relationship to predict the generation zones for this specific kerogen in wells with similar thermal and burial histories in the basin for which maturity data are available.
|}
[[file:evaluating-source-rocks_fig6-17.png|thumb|{{figure number|6-17}}. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]]
==See also==
* [[Relationships between maturity and hydrocarbon generation]]
* [[Kerogen type and hydrocarbon generation]]
* [[Kerogen type and transformation ratio]]
* [[Comparison of kerogen types]]
* [[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]]