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Overpressure and hydrocarbon distribution, Gulf Coast (view source)
Revision as of 22:55, 13 February 2014
, 22:55, 13 February 2014→Hydrocarbon distribution vs. overpressure
==[[Hydrocarbon distribution]] vs. overpressure==
==[[Hydrocarbon distribution]] vs. overpressure==
[[file:evaluating-top-and-fault-seal_fig10-46.png|thumb|{{figure number|1}}After .<ref name=ch10r47 /> Copyright: Oil & Gas Journal.]]
[[file:evaluating-top-and-fault-seal_fig10-46.png|thumb|{{figure number|2}}After .<ref name=ch10r47 /> Copyright: Oil & Gas Journal.]]
The distribution of hydrocarbons relative to the top of overpressure changes as reservoir depth changes is shown in [[:file:evaluating-top-and-fault-seal_fig10-46.png|Figure 2]]. This pattern is consistent with loss of top seal integrity because of hydrofracturing rather than a simple loss of reservoir quality or other variable. Deeper reservoirs have the peak gas occurrence below the top of overpressure. This is consistent with the changing P<sub>f</sub> with depth. As depth increases, confining pressure increases and thus the amount of pressure required to fracture the top seal (P<sub>f</sub>) increases. As fracture pressure increases, the depth of the first intact top seal increases.
The distribution of hydrocarbons relative to the top of overpressure changes as reservoir depth changes is shown in [[:file:evaluating-top-and-fault-seal_fig10-46.png|Figure 2]]. This pattern is consistent with loss of top seal integrity because of hydrofracturing rather than a simple loss of reservoir quality or other variable. Deeper reservoirs have the peak gas occurrence below the top of overpressure. This is consistent with the changing P<sub>f</sub> with depth. As depth increases, confining pressure increases and thus the amount of pressure required to fracture the top seal (P<sub>f</sub>) increases. As fracture pressure increases, the depth of the first intact top seal increases.