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Petroleum system: geographic, stratigraphic, and temporal extent (view source)
Revision as of 17:20, 29 April 2014
, 17:20, 29 April 2014→Temporal aspects
==Temporal aspects==
==Temporal aspects==
[[file:petroleum-systems_fig3-3.png|left|thumb|{{figure number|1.}}Burial history chart.]]
[[file:petroleum-systems_fig3-3.png|thumb|{{figure number|1.}}Burial history chart.]]
A petroleum system has three important temporal aspects:
A petroleum system has three important temporal aspects:
The '''preservation time''' of the petroleum system begins immediately after the generation-migration-accumulation process occurs and extends to the present day. It encompasses any changes to the petroleum accumulations during this period. During the preservation time, remigration, physical or biological degradation, or complete destruction of the petroleum may take place. During the preservation time, remigrated (tertiary migration) petroleum can accumulate in reservoir rocks deposited after the petroleum system formed. If insignificant tectonic activity occurs during the preservation time, accumulations remain in their original position. Remigration happens during the preservation time only if folding, faulting, uplift, or erosion occurs. If all accumulations are destroyed during preservation time, then the evidence that a petroleum system existed is absent. An incomplete or just completed petroleum system lacks a preservation time.
The '''preservation time''' of the petroleum system begins immediately after the generation-migration-accumulation process occurs and extends to the present day. It encompasses any changes to the petroleum accumulations during this period. During the preservation time, remigration, physical or biological degradation, or complete destruction of the petroleum may take place. During the preservation time, remigrated (tertiary migration) petroleum can accumulate in reservoir rocks deposited after the petroleum system formed. If insignificant tectonic activity occurs during the preservation time, accumulations remain in their original position. Remigration happens during the preservation time only if folding, faulting, uplift, or erosion occurs. If all accumulations are destroyed during preservation time, then the evidence that a petroleum system existed is absent. An incomplete or just completed petroleum system lacks a preservation time.
==Spatial aspects==
==Spatial aspects==