Changes

==BVW==

==BVW==

[[file:predicting-reservoir-system-quality-and-performance_fig9-40.png|weather|thumb|{{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|300px|thumb|{{figure number|1}}How a Buckles plot relates to capillary pressure, fluid distribution, and fluid recovery in a reservoir.]]

Bulk volume water (BVW) equals 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 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.

==S_w—depth plots==

==S_w—depth plots==

[[file:predicting-reservoir-system-quality-and-performance_fig9-41.png|thumb|{{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|thumb|300px|{{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.]]

S_w–depth plots are simple plots of S_w vs. depth. They illustrate how S_w varies within a hydrocarbon-bearing zone. Variations reflect different pore types and/or height above free water. An S_w–depth plot can be used to delineate three things:

S_w–depth plots are simple plots of S_w vs. depth. They illustrate how S_w varies within a hydrocarbon-bearing zone. Variations reflect different pore types and/or height above free water. An S_w–depth plot can be used to delineate three things:

==Height–s_w–pore type diagram==

==Height–s_w–pore type diagram==

[[file:predicting-reservoir-system-quality-and-performance_fig9-42.png|thumb|{{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|300px|thumb|{{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.]]

The empirical ternary diagram in [[:file:predicting-reservoir-system-quality-and-performance_fig9-42.png|Figure 3]] is handy for estimating either height above free water, pore type (r₃₅), or S_w for a flow unit when the other two variables are known. For example, if S_w for a flow unit is 20% and the pore type is macro with a port size of approximately 3μ, then the height above free water for the flow unit is approximately [[length::100 ft]]. Assumptions for the diagram include 30°API gravity oil, saltwater formation water, and water wet.

The empirical ternary diagram in [[:file:predicting-reservoir-system-quality-and-performance_fig9-42.png|Figure 3]] is handy for estimating either height above free water, pore type (r₃₅), or S_w for a flow unit when the other two variables are known. For example, if S_w for a flow unit is 20% and the pore type is macro with a port size of approximately 3μ, then the height above free water for the flow unit is approximately [[length::100 ft]]. Assumptions for the diagram include 30°API gravity oil, saltwater formation water, and water wet.