[[file:petroleum-systems_fig3-4.png|thumb|{{figure number|2}}Geographic extent of the fictitious Deer-Boar(.) petroleum system.]]
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petroleum-systems_fig3-4.png|{{figure number|2}}Geographic extent of the fictitious Deer-Boar(.) petroleum system.
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petroleum-systems_fig3-5.png|{{figure number|3}}Stratigraphic extent of the fictitious Deer-Boar(.) petroleum system at the critical moment.
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[[file:petroleum-systems_fig3-5.png|thumb|{{figure number|3}}Stratigraphic extent of the fictitious Deer-Boar(.) petroleum system at the critical moment.]]
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Each petroleum system can be defined spatially by its geographic and stratigraphic extent.
Each petroleum system can be defined spatially by its geographic and stratigraphic extent.