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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 = Traps, trap types, and the petroleum system
| chapter = Classification of exploration traps
| frompg = 2-1
| topg = 2-42
| author = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster
| link = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
Secondary or even tertiary trapping elements commonly modify the primary trapping agent. Structural traps may have a stratigraphic component or vice versa. Sometimes the distinction whether the trap belongs to one system or another is quite blurred. Traps with two or more trapping elements are called combination traps.
==Primary trapping element==
To determine what the primary trapping element is, consider each element of the trap and ask, “Would the trap exist if that element were not part of the trap?” We could also ask, “Which element would I look for first if I were exploring for this trap?”
==Classifying combination traps informally==
To classify a combination trap informally, list the primary trap element first, followed by secondary and tertiary trap elements. You can classify a combination trap informally in at least two different formats. For example, Upper Valley field, Utah, shown in the map and cross section below, could be classified informally as (1) a hydrodynamically modified anticlinal trap or as (2) a hydrodynamic/anticlinal trap.
[[file:classification-of-exploration-traps_fig2-3.png|thumb|{{figure number|2-3}}. Copyright: RMAG.]]
==Classifying combination traps formally==
We classify a trap formally by listing the regimes, classes, and families for the primary, secondary, and (if necessary) tertiary systems. For example, the diagram below shows the formal classification for Upper Valley field.
[[file:classification-of-exploration-traps_fig2-4.png|thumb|{{figure number|2-4}}See text for explanation.]]
==Combination structural traps==
Some structural traps are combinations of the three structural trap regimes: fold, fault, Structural traps and fracture. The Buck Peak field shown below is an example of a combination structural trap.
[[file:classification-of-exploration-traps_fig2-5.png|thumb|{{figure number|2-5}}Modified. Copyright: Vincelette and Foster, 1992; courtesy RMAG.]]
==Buck peak formal classification==
The diagram below shows the formal classification for the Buck Peak field, which is a combination structural trap.
[[file:classification-of-exploration-traps_fig2-6.png|thumb|{{figure number|2-6}}See text for explanation.]]
==See also==
* [[How to use the classification scheme]]
* [[Classifying traps]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Traps, trap types, and the petroleum system]]
[[Category:Classification of exploration traps]]
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Traps, trap types, and the petroleum system
| chapter = Classification of exploration traps
| frompg = 2-1
| topg = 2-42
| author = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster
| link = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
Secondary or even tertiary trapping elements commonly modify the primary trapping agent. Structural traps may have a stratigraphic component or vice versa. Sometimes the distinction whether the trap belongs to one system or another is quite blurred. Traps with two or more trapping elements are called combination traps.
==Primary trapping element==
To determine what the primary trapping element is, consider each element of the trap and ask, “Would the trap exist if that element were not part of the trap?” We could also ask, “Which element would I look for first if I were exploring for this trap?”
==Classifying combination traps informally==
To classify a combination trap informally, list the primary trap element first, followed by secondary and tertiary trap elements. You can classify a combination trap informally in at least two different formats. For example, Upper Valley field, Utah, shown in the map and cross section below, could be classified informally as (1) a hydrodynamically modified anticlinal trap or as (2) a hydrodynamic/anticlinal trap.
[[file:classification-of-exploration-traps_fig2-3.png|thumb|{{figure number|2-3}}. Copyright: RMAG.]]
==Classifying combination traps formally==
We classify a trap formally by listing the regimes, classes, and families for the primary, secondary, and (if necessary) tertiary systems. For example, the diagram below shows the formal classification for Upper Valley field.
[[file:classification-of-exploration-traps_fig2-4.png|thumb|{{figure number|2-4}}See text for explanation.]]
==Combination structural traps==
Some structural traps are combinations of the three structural trap regimes: fold, fault, Structural traps and fracture. The Buck Peak field shown below is an example of a combination structural trap.
[[file:classification-of-exploration-traps_fig2-5.png|thumb|{{figure number|2-5}}Modified. Copyright: Vincelette and Foster, 1992; courtesy RMAG.]]
==Buck peak formal classification==
The diagram below shows the formal classification for the Buck Peak field, which is a combination structural trap.
[[file:classification-of-exploration-traps_fig2-6.png|thumb|{{figure number|2-6}}See text for explanation.]]
==See also==
* [[How to use the classification scheme]]
* [[Classifying traps]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Traps, trap types, and the petroleum system]]
[[Category:Classification of exploration traps]]