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→Residual and continuous-phase shows
==Residual and continuous-phase shows==
==Residual and continuous-phase shows==
<gallery mode=packed heights=200px widths=200px>
predicting-reservoir-system-quality-and-performance_fig9-43.png|{{figure number|1}}Drainage and fill-up relative permeability curves for an oil reservoir.
predicting-reservoir-system-quality-and-performance_fig9-44.png|{{figure number|2}}Schematic cross section of a stratigraphic trap with transition, reservoir, and waste zones and their corresponding show characteristics.
predicting-reservoir-system-quality-and-performance_fig9-45.png|{{figure number|3}}Schematic cross section of a stratigraphic trap with residual hydrocarbon saturation, reservoir, and waste zones and their corresponding show characteristics.
</gallery>
During reservoir water drainage, hydrocarbons enter a trap. The trap starts at 0% hydrocarbon saturation (S<sub>o</sub>), or 100% S<sub>w</sub>, and ends up with a higher S<sub>o</sub>. Water refills the reservoir as hydrocarbons exit a trap (fill-up). During fill-up some hydrocarbons are permanently left behind as a residual accumulation. There is no relative permeability to hydrocarbons in rocks containing residual hydrocarbons. At a point during fill-up, hydrocarbons no longer drain because they are no longer connected in a column but are isolated in pores. A DST of a zone with residual hydrocarbons produces no oil or gas, and an RFT would not show a hydrocarbon gradient.
During reservoir water drainage, hydrocarbons enter a trap. The trap starts at 0% hydrocarbon saturation (S<sub>o</sub>), or 100% S<sub>w</sub>, and ends up with a higher S<sub>o</sub>. Water refills the reservoir as hydrocarbons exit a trap (fill-up). During fill-up some hydrocarbons are permanently left behind as a residual accumulation. There is no relative permeability to hydrocarbons in rocks containing residual hydrocarbons. At a point during fill-up, hydrocarbons no longer drain because they are no longer connected in a column but are isolated in pores. A DST of a zone with residual hydrocarbons produces no oil or gas, and an RFT would not show a hydrocarbon gradient.
===Trap with transition zone===
===Trap with transition zone===
[[:file:predicting-reservoir-system-quality-and-performance_fig9-44.png|Figure 2]] is a schematic cross section of a [[stratigraphic trap]] with transition, reservoir, and waste zones and their corresponding show characteristics.
[[:file:predicting-reservoir-system-quality-and-performance_fig9-44.png|Figure 2]] is a schematic cross section of a [[stratigraphic trap]] with transition, reservoir, and waste zones and their corresponding show characteristics.
===Trap with residual hydrocarbon zone===
===Trap with residual hydrocarbon zone===
[[:file:predicting-reservoir-system-quality-and-performance_fig9-45.png|Figure 3]] is a schematic cross section of a stratigraphic trap with residual hydrocarbon saturation, reservoir, and waste zones and their corresponding show characteristics.
[[:file:predicting-reservoir-system-quality-and-performance_fig9-45.png|Figure 3]] is a schematic cross section of a stratigraphic trap with residual hydrocarbon saturation, reservoir, and waste zones and their corresponding show characteristics.
==See also==
==See also==