Changes

  | part    = Critical elements of the petroleum system

  | part    = Critical elements of the petroleum system

  | chapter = Evaluating source rocks

  | chapter = Evaluating source rocks

  | frompg  = 6-1

  | frompg  = 6-39

  | topg    = 6-41

  | topg    = 6-39

  | author  = Carol A. Law

  | author  = Carol A. Law

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch06/ch06.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch06/ch06.htm

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

}}

}}

Hydrocarbon generation results from computerized 1-D basin [[modeling]] software are typically presented as either open- or closed-system yields. '''Open-system''' models are based on the assumption that hydrocarbons have been expelled from the source rock, have been transported away, and are no longer subject to the thermal conditions of the 1-D model. '''Closed-system''' models assume the hydrocarbons have not been expelled from the source rock and that all generated hydrocarbon phases are subject to further cracking to lighter phases.

[[Petroleum generation|Hydrocarbon generation]] results from computerized 1-D basin [[modeling]] software are typically presented as either open- or closed-system yields. '''Open-system''' models are based on the assumption that hydrocarbons have been expelled from the source rock, have been transported away, and are no longer subject to the thermal conditions of the 1-D model. '''Closed-system''' models assume the hydrocarbons have not been expelled from the source rock and that all generated hydrocarbon phases are subject to further [[cracking]] to lighter phases.

==Implications for yield predictions==

==Implications for yield predictions==

[[file:evaluating-source-rocks_fig6-19.png|thumb|{{figure number|6-19}}. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]]

[[file:evaluating-source-rocks_fig6-19.png|300px|thumb|{{figure number|1}}Examples of yield curves for the same well, based on both open- and closed-system modeling conditions. Copyright: results of Genex 1-D basin modeling software, courtesy Institute Français du Petrole.]]

 

'''Note:''' In general, open-system models overestimate the quantities of liquids present in a system. Closed-system models overestimate the amount of gas present in the system and are pessimistic in terms of predicting quantities of liquids. Closed-system models typically are not run any more. However, when evaluating older models, consider this effect.

'''Note:''' In general, open-system models overestimate the quantities of liquids present in a system. Closed-system models overestimate the amount of gas present in the system and are pessimistic in terms of predicting quantities of liquids. Closed-system models typically are not run any more. However, when evaluating older models, consider this effect.

* [[Kerogen type and maturity]]

* [[Kerogen type and maturity]]

* [[Kerogen type and transformation ratio]]

* [[Kerogen type and transformation ratio]]

* [[Comparison of kerogen types]]

* [[Kerogen types: comparison of maturity measures]]

==External links==

==External links==

[[Category:Critical elements of the petroleum system]]  

[[Category:Critical elements of the petroleum system]]  

[[Category:Evaluating source rocks]]

[[Category:Evaluating source rocks]]