Changes

==What is a container?==

==What is a container?==

[[file:predicting-reservoir-system-quality-and-performance_fig9-4.png|thumb|{{figure number|1}}Cross section of a reservoir system in an unconformity truncation trap.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-4.png|300px|thumb|{{figure number|1}}Cross section of a reservoir system in an unconformity truncation trap.]]

A container is a ''reservoir system subdivision'' consisting of a pore system, made up of one or more flow units, that responds as a unit when fluid is withdrawn. Containers are defined by correlating flow units between wells. Boundaries between containers are where flow diverges within a flow unit shared by two containers ([[:file:predicting-reservoir-system-quality-and-performance_fig9-4.png|Figure 1]]). They define and map reservoir geology to help us predict reservoir performance.

A container is a ''reservoir system subdivision'' consisting of a pore system, made up of one or more flow units, that responds as a unit when fluid is withdrawn. Containers are defined by correlating flow units between wells. Boundaries between containers are where flow diverges within a flow unit shared by two containers ([[:file:predicting-reservoir-system-quality-and-performance_fig9-4.png|Figure 1]]). They define and map reservoir geology to help us predict reservoir performance.

==Defining flow units==

==Defining flow units==

[[file:predicting-reservoir-system-quality-and-performance_fig9-2.png|thumb|{{figure number|2}}Example of how flow units are differentiated on the basis of the parameters listed.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-2.png|300px|thumb|{{figure number|2}}Example of how flow units are differentiated on the basis of the parameters listed.]]

To delineate reservoir flow units, subdivide the wellbore into intervals of uniform petrophysical characteristics using one or more of the following:

To delineate reservoir flow units, subdivide the wellbore into intervals of uniform petrophysical characteristics using one or more of the following:

==Example==

==Example==

[[file:predicting-reservoir-system-quality-and-performance_fig9-3.png|thumb|{{figure number|3}}Flow unit definition using water saturation, log analysis, lithology, and mean pore throat size (pore size). &copy; Hartmann and Coalson.<ref name=Hartnamm_Coalson_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.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-3.png|300px|thumb|{{figure number|3}}Flow unit definition using water saturation, log analysis, lithology, and mean pore throat size (pore size). &copy; Hartmann and Coalson.<ref name=Hartnamm_Coalson_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.]]

The example in [[:file:predicting-reservoir-system-quality-and-performance_fig9-3.png|Figure 3]] from the Morrow Sandstone of southeastern Colorado illustrates flow unit definition using water saturation, log analysis, lithology, and mean pore throat size (pore size).

The example in [[:file:predicting-reservoir-system-quality-and-performance_fig9-3.png|Figure 3]] from the Morrow Sandstone of southeastern Colorado illustrates flow unit definition using water saturation, log analysis, lithology, and mean pore throat size (pore size).

{| class = "wikitable"

{| class = "wikitable"

|-

|-

! Step

! Step || Action

! Action

|-

|-

| 1

| 1 || Correlate flow units between wells in strike and dip-oriented structural and stratigraphic cross sections.

| Correlate flow units between wells in strike and dip-oriented structural and stratigraphic cross sections.

|-

|-

| 2

| 2 || Identify the high-quality flow units from rock and log data.

| Identify the high-quality flow units from rock and log data.

|-

|-

| 3

| 3 || Draw boundaries between containers by identifying flow barriers or by interpreting where flow lines diverge within flow units common to both containers.

| Draw boundaries between containers by identifying flow barriers or by interpreting where flow lines diverge within flow units common to both containers.

|}

|}

==Flow units, facies, and containers==

==Flow units, facies, and containers==

[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|thumb|{{figure number|4}}Stratigraphic cross section showing the facies and flow units present in the Hartzog Draw field of Wyoming.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|300px|thumb|{{figure number|4}}Stratigraphic cross section showing the facies and flow units present in the Hartzog Draw field of Wyoming.]]

The stratigraphic cross section in [[:file:predicting-reservoir-system-quality-and-performance_fig9-5.png|Figure 4]] shows the facies and flow units present in the Hartzog Draw field of Wyoming. The producing formation is the Upper Cretaceous Shannon Sandstone, composed of fine- to medium-grained clayey and glauconitic sandstones deposited as marine shelf bars. Notice how facies and flow units do not always correspond, especially within the central bar facies. The flow units in this section of Hartzog Draw behave as a unit; therefore, only one container is present.

The stratigraphic cross section in [[:file:predicting-reservoir-system-quality-and-performance_fig9-5.png|Figure 4]] shows the facies and flow units present in the Hartzog Draw field of Wyoming. The producing formation is the Upper Cretaceous Shannon Sandstone, composed of fine- to medium-grained clayey and glauconitic sandstones deposited as marine shelf bars. Notice how facies and flow units do not always correspond, especially within the central bar facies. The flow units in this section of Hartzog Draw behave as a unit; therefore, only one container is present.