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Line 20: − 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subdivision'' consisting of a pore system, made up of one or more flow units, that responds as a unit when fluid is withdrawn.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 (see Figure 9-4). They define and map reservoir geology to help us predict reservoir performance. − + + + + + + Line 32:
Line 36: − + − [[file:predicting-reservoir-system-quality-and-performance_fig9-2.png|thumb|{{figure number|9-2}}.]]+ − ==Example==+ − The example below from the Morrow Sandstone of southeastern Colorado illustrates flow unit definition using water saturation, log analysis, lithology, and mean pore throat size (port size). − + Line 69:
Line 72: − The stratigraphic cross section below 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. − + + +
Flow units and containers (view source)
Revision as of 16:07, 4 February 2014
, 16:07, 4 February 2014no edit summary
==What is a container?==
==What is a container?==
[[file:predicting-reservoir-system-quality-and-performance_fig9-4.png|thumb|{{figure number|9-4}}See text for explanation.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-4.png|thumb|{{figure number|1}}See text for explanation.]]
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subdivision'' consisting of a pore system, made up of one or more flow units, that responds as a unit when fluid is withdrawn.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 (see [[: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}}.]]
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:
* [[Porosity]]–permeability cross plots (r<sub>35</sub>—defined later)
* [[Porosity]]–permeability cross plots (r<sub>35</sub>—defined later)
The diagram below shows how flow units are differentiated on the basis of the parameters listed above.
The diagram in [[:file:predicting-reservoir-system-quality-and-performance_fig9-2.png|Figure 2]] shows how flow units are differentiated on the basis of the parameters listed above.
==Example==
[[file:predicting-reservoir-system-quality-and-performance_fig9-3.png|thumb|{{figure number|3}}. Copyright: Hartmann and Coalson, 1990; courtesy RMAG.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-3.png|thumb|{{figure number|9-3}}. Copyright: Hartmann and Coalson, 1990; courtesy RMAG.]]
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 (port size).
==Procedure: defining containers==
==Procedure: defining containers==
==Flow units, facies, and containers==
==Flow units, facies, and containers==
[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|thumb|{{figure number|9-5}}.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-5.png|thumb|{{figure number|4}}.]]
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.
==Flow unit and container upscaling==
==Flow unit and container upscaling==