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predicting-reservoir-system-quality-and-performance_fig9-103.png|{{figure number|1}}Pickett plot for the Midale Vuggy from an example well in Weyburn field. Copyright: Coalson et al.;<ref name=Coalson1994>Coalson, E. B., S. M. Goolsby, and M. H. Franklin, 1994, Subtle seals and fluid-flow barriers in carbonate rocks, in J. C. Dolson, M. L. Hendricks, and W. A. Wescott, eds., Unconformity Related Hydrocarbons in Sedimentary Sequences: RMAG Guidebook for Petroleum Exploration and Exploitation in Clastic and Carbonate Sediments, p. 45–58.</ref> courtesy RMAG.

predicting-reservoir-system-quality-and-performance_fig9-103.png|{{figure number|1}}Pickett plot for the Midale Vuggy from an example well in Weyburn field. Copyright: Coalson et al.;<ref name=Coalson1994>Coalson, E. B., S. M. Goolsby, and M. H. Franklin, 1994, Subtle seals and fluid-flow barriers in carbonate rocks, in J. C. Dolson, M. L. Hendricks, and W. A. Wescott, eds., Unconformity Related Hydrocarbons in Sedimentary Sequences: RMAG Guidebook for Petroleum Exploration and Exploitation in Clastic and Carbonate Sediments, p. 45–58.</ref> courtesy RMAG.

Predicting-reservoir-system-quality-and-performance fig9-102.png|{{figure number|2}}Illustration of (A) mudstones that are  meso- to macroporous and (B) micro- to mesoporous packstones. From Coalson et al.;<ref name=Coalson1994 /> courtesy RMAG.

Predicting-reservoir-system-quality-and-performance fig9-102.png|{{figure number|2}}Illustration of (A) packstones that are  meso- to macroporous and (B) micro- to mesoporous mudstones. From Coalson et al.;<ref name=Coalson1994 /> courtesy RMAG.

predicting-reservoir-system-quality-and-performance_fig9-104.png|{{figure number|3}}Buckles plot for the Weyburn well. Copyright: Coalson et al.;<ref name=Coalson1994 /> courtesy RMAG.

predicting-reservoir-system-quality-and-performance_fig9-104.png|{{figure number|3}}Buckles plot for the Weyburn well. Copyright: Coalson et al.;<ref name=Coalson1994 /> courtesy RMAG.

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As shown on [[:File:Predicting-reservoir-system-quality-and-performance fig9-102.png|Figure 2]], mudstones (A) are [[Wikipedia:Microporous material|micro]]- to [[Wikipedia:Mesoporous material|mesoporous]]; packstones (B) are meso- to [ http://en.wiktionary.org/wiki/macroporous macroporous]. The mudstones have more pores with smaller pore throats than the packstones. This means mudstones have greater pore surface area and higher immobile S_w. As a consequence, S_w values for mudstones are higher at any given elevation in the oil column.

As shown on [[:File:Predicting-reservoir-system-quality-and-performance fig9-102.png|Figure 2]], mudstones (B) are [[Wikipedia:Microporous material|micro]]- to [[Wikipedia:Mesoporous material|mesoporous]]; packstones (A) are meso- to [ http://en.wiktionary.org/wiki/macroporous macroporous]. The mudstones have more pores with smaller pore throats than the packstones. This means mudstones have greater pore surface area and higher immobile S_w. As a consequence, S_w values for mudstones are higher at any given elevation in the oil column.

[[:file:predicting-reservoir-system-quality-and-performance_fig9-104.png|Figure 3]] is a [[Buckles plot]] for the Weyburn well. The hyperbolic curves represent equal values of S_w × porosity (Φ). Points from the same pore type that fall along a hyperbolic curve are at immobile S_w. Curves with higher values represent higher immobile S_w.

[[:file:predicting-reservoir-system-quality-and-performance_fig9-104.png|Figure 3]] is a [[Buckles plot]] for the Weyburn well. The hyperbolic curves represent equal values of S_w × porosity (Φ). Points from the same pore type that fall along a hyperbolic curve are at immobile S_w. Curves with higher values represent higher immobile S_w.