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By studying core and log data from one well (well 11; see [[;file:predicting-reservoir-system-quality-and-performance_fig9-86.png|Figure 1]]), we see a picture of a clastic reservoir with wide heterogeneity in total porosities, pore-throat sizes, and [[capillary pressure]]s. In addition, the depositional environment of these sandstones (fluvial valley fill and sandstone) indicates they probably have limited lateral continuity within the valley-fill complex.

By studying core and log data from one well (well 11; see [[:file:predicting-reservoir-system-quality-and-performance_fig9-86.png|Figure 1]]), we see a picture of a clastic reservoir with wide heterogeneity in total porosities, pore-throat sizes, and [[capillary pressure]]s. In addition, the depositional environment of these sandstones (fluvial valley fill and sandstone) indicates they probably have limited lateral continuity within the valley-fill complex.

[[file:predicting-reservoir-system-quality-and-performance_fig9-86.png|thumb|[[figure number|1]]. From Sonnenberg, 1985, courtesy RMAG.

[[file:predicting-reservoir-system-quality-and-performance_fig9-86.png|thumb|{{figure number|1}} From Sonnenberg.<ref name=Sonnenberg_1985>Sonnenberg, S. A., 1985, Tectonic and sedimentation model for Morrow sandstone deposition, Sorrento field area, Denver basin, Colorado: The Mountain Geologist, October, p. 180-191.</ref> Courtesy Rocky Mountain Association of Geologists.]]

==Reservoir lithologic description==

==Reservoir lithologic description==

==Reservoir porosity and permeability==

==Reservoir porosity and permeability==

[[file:predicting-reservoir-system-quality-and-performance_fig9-87.png|thumb|{{figure number|2}}. Copyright: Hartmann and ;<ref name=ch09r11>Coalson, E., B., Hartmann, D., J., Thomas, J., B., 1990, Applied Petrophysics in Exploration and Exploitation: Notes from short course sponsored by Univ. of Colo.–Denver, var. pages.</ref> courtesy RMAG.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-87.png|thumb|{{figure number|2}}From Hartmann and Coalson.<ref name=Hartmannandcoalson_1990>Hartmann, D. J., and E. B. Coalson, 1990, Evaluation of the Morrow sandstone in Sorrento field, Cheyenne County, Colorado, ''in'' S. A. Sonnenberg, L. T. Shannon, K. Rader, W. F. von Drehle, and G.W. Martin, eds., Morrow Sandstones of Southeast Colorado and Adjacent Areas: RMAG Symposium, p. 91-100.</ref> Courtesy Rocky Mountain Association of Geologists.]]

Morrow sandstones in Sorrento field have a wide range in porosity and [[permeability]]. Maximum observed porosity (Φ) is 20-22%, but more typical values are 10-15%. Air permeabilities (K_a) are as great as 1-2 darcies but more commonly are 200-500 md.

Morrow sandstones in Sorrento field have a wide range in porosity and [[permeability]]. Maximum observed porosity (Φ) is 20-22%, but more typical values are 10-15%. Air permeabilities (K_a) are as great as 1-2 darcies but more commonly are 200-500 md.

==Extrapolated capillary pressure curves and pore types==

==Extrapolated capillary pressure curves and pore types==

[[file:predicting-reservoir-system-quality-and-performance_fig9-88.png|thumb|{{figure number|3}}. Copyright: Hartmann and Coalson, 1990; courtesy RMAG.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-88.png|thumb|{{figure number|3}}From Hartmann and Coalson.<ref name=Hartmannandcoalson_1990 /> Courtesy Rocky Mountain Association of Geologists.]]

No capillary pressure measurements were available for this study. They were estimated-by plotting r₃₅ values on a semilog crossplot of fluid saturation vs. capillary pressure. A capillary pressure curve for each sample passes through its correlative r₃₅ value. Calculations of r₃₅ for well 11 indicate a large variety of capillary pressures and pore types. Pore types for the Morrow samples from this well are mega, macro, and micro.

No capillary pressure measurements were available for this study. They were estimated-by plotting r₃₅ values on a semilog crossplot of fluid saturation vs. capillary pressure. A capillary pressure curve for each sample passes through its correlative r₃₅ value. Calculations of r₃₅ for well 11 indicate a large variety of capillary pressures and pore types. Pore types for the Morrow samples from this well are mega, macro, and micro.