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→Methods for determining fluid contacts
| Reservoir heterogeneity
| Reservoir heterogeneity
| Differences of [[Determining water saturation|hydrocarbon saturation]] and hydrocarbon [[permeability]] due to [[Capillary pressure|capillary effects]] on different pore systems
| Differences of [[Determining water saturation|hydrocarbon saturation]] and hydrocarbon [[permeability]] due to [[Capillary pressure|capillary effects]] on different pore systems
| Presence of several reservoir lithologies with different capillary properties Fluid contacts at facies changes Oil-water and gas-water contacts affected; gas-oil contact not affected Hydrocarbon and water production may be intercalated
| Presence of several reservoir lithologies with different capillary properties Fluid contacts at facies changes (See [[Depositional environments]]) Oil-water and gas-water contacts affected; gas-oil contact not affected Hydrocarbon and water production may be intercalated
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| Semipermeable barriers
| Semipermeable barriers