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The distribution of [[water saturation]] (S_w) values within a [[reservoir]] depends on the height above [[Free water level|free water]], [[hydrocarbon]] type, [[Pore throat size and connectivity|pore throat-size distribution]], and [[Reservoir quality|pore geometry]]. Mapping S_w distribution in a reservoir helps us predict trap boundaries.

The distribution of [[water saturation]] (S_w) values within a [[reservoir]] depends on the height above [[Free water level|free water]], [[hydrocarbon]] type, [[Pore throat size and connectivity|pore throat-size distribution]], and [[Reservoir quality|pore geometry]]. Mapping S_w distribution in a reservoir helps us predict trap boundaries.

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file:predicting-reservoir-system-quality-and-performance_fig9-40.png|{{figure number|1}}How a Buckles plot relates to capillary pressure, fluid distribution, and fluid recovery in a reservoir.

file:predicting-reservoir-system-quality-and-performance_fig9-40.png|{{figure number|1}}How a Buckles plot relates to capillary pressure, fluid distribution, and fluid recovery in a reservoir.

file:predicting-reservoir-system-quality-and-performance_fig9-41.png|{{figure number|2}}Hypothetical example of an S_w–depth plot with estimated S_w distribution curves for several flow units for a hydrocarbon-bearing zone in a well.

file:predicting-reservoir-system-quality-and-performance_fig9-41.png|{{figure number|2}}Hypothetical example of an S_w–depth plot with estimated S_w distribution curves for several flow units for a hydrocarbon-bearing zone in a well.

file:predicting-reservoir-system-quality-and-performance_fig9-42.png|{{figure number|3}}Empirical ternary diagram for estimating height above free water, pore type (r₃₅), and S_w for a flow unit when the other two variables are known.

file:predicting-reservoir-system-quality-and-performance_fig9-42.png|{{figure number|3}}Empirical ternary diagram for estimating height above free water, pore type (r₃₅), and S_w for a flow unit when the other two variables are known.

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Bulk volume water (BVW) equals [[porosity]] (Φ) × S_w. In zones with the same pore type and geometry, BVW is a function of the height above the [[free water level]]. Above the transition zone, BVW is fairly constant. Below the transition zone, BVW is variable.

Bulk volume water (BVW) equals [[porosity]] (Φ) × S_w. In zones with the same pore type and geometry, BVW is a function of the height above the [[free water level]]. Above the transition zone, BVW is fairly constant. Below the transition zone, BVW is variable.