Changes

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| Reservoir heterogeneity

| Reservoir heterogeneity

| Differences of hydrocarbon saturation and hydrocarbon [[permeability]] due to capillary effects on different pore systems

| Differences of 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 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

| Semipermeable barriers compartmentalize an otherwise homogeneous reservoir

| Semipermeable barriers compartmentalize an otherwise homogeneous reservoir

| Fluid contacts horizontal, yet at different elevations in different parts of the pool; All types of fluid contacts affected Barriers are documented in locations which might cause observed compartmentalization; Contact changes do not correspond to regional hydrodynamics or changes in capillary properties

| Fluid contacts horizontal, yet at different elevations in different parts of the pool; All types of fluid contacts affected Barriers are documented in locations which might cause observed compartmentalization; Contact changes do not correspond to regional hydrodynamics or changes in [[Capillary pressure|capillary properties]]

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